diff options
Diffstat (limited to 'Documentation/gpu')
48 files changed, 11327 insertions, 546 deletions
diff --git a/Documentation/gpu/amdgpu-dc.rst b/Documentation/gpu/amdgpu-dc.rst deleted file mode 100644 index f7ff7e1309de..000000000000 --- a/Documentation/gpu/amdgpu-dc.rst +++ /dev/null @@ -1,74 +0,0 @@ -=================================== -drm/amd/display - Display Core (DC) -=================================== - -*placeholder - general description of supported platforms, what dc is, etc.* - -Because it is partially shared with other operating systems, the Display Core -Driver is divided in two pieces. - -1. **Display Core (DC)** contains the OS-agnostic components. Things like - hardware programming and resource management are handled here. -2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the - amdgpu base driver and DRM are implemented here. - -It doesn't help that the entire package is frequently referred to as DC. But -with the context in mind, it should be clear. - -When CONFIG_DRM_AMD_DC is enabled, DC will be initialized by default for -supported ASICs. To force disable, set `amdgpu.dc=0` on kernel command line. -Likewise, to force enable on unsupported ASICs, set `amdgpu.dc=1`. - -To determine if DC is loaded, search dmesg for the following entry: - -``Display Core initialized with <version number here>`` - -AMDgpu Display Manager -====================== - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :doc: overview - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h - :internal: - -Lifecycle ---------- - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :doc: DM Lifecycle - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :functions: dm_hw_init dm_hw_fini - -Interrupts ----------- - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c - :doc: overview - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c - :internal: - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :functions: register_hpd_handlers dm_crtc_high_irq dm_pflip_high_irq - -Atomic Implementation ---------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :doc: atomic - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :functions: amdgpu_dm_atomic_check amdgpu_dm_atomic_commit_tail - -Display Core -============ - -**WIP** - -FreeSync Video --------------- - -.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c - :doc: FreeSync Video diff --git a/Documentation/gpu/amdgpu.rst b/Documentation/gpu/amdgpu.rst deleted file mode 100644 index 8ba72e898099..000000000000 --- a/Documentation/gpu/amdgpu.rst +++ /dev/null @@ -1,324 +0,0 @@ -========================= - drm/amdgpu AMDgpu driver -========================= - -The drm/amdgpu driver supports all AMD Radeon GPUs based on the Graphics Core -Next (GCN) architecture. - -Module Parameters -================= - -The amdgpu driver supports the following module parameters: - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c - -Core Driver Infrastructure -========================== - -This section covers core driver infrastructure. - -.. _amdgpu_memory_domains: - -Memory Domains --------------- - -.. kernel-doc:: include/uapi/drm/amdgpu_drm.h - :doc: memory domains - -Buffer Objects --------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c - :doc: amdgpu_object - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c - :internal: - -PRIME Buffer Sharing --------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c - :doc: PRIME Buffer Sharing - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c - :internal: - -MMU Notifier ------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c - :doc: MMU Notifier - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c - :internal: - -AMDGPU Virtual Memory ---------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c - :doc: GPUVM - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c - :internal: - -Interrupt Handling ------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c - :doc: Interrupt Handling - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c - :internal: - -IP Blocks ------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h - :doc: IP Blocks - -.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h - :identifiers: amd_ip_block_type amd_ip_funcs - -AMDGPU XGMI Support -=================== - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c - -AMDGPU RAS Support -================== - -The AMDGPU RAS interfaces are exposed via sysfs (for informational queries) and -debugfs (for error injection). - -RAS debugfs/sysfs Control and Error Injection Interfaces --------------------------------------------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c - :doc: AMDGPU RAS debugfs control interface - -RAS Reboot Behavior for Unrecoverable Errors --------------------------------------------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c - :doc: AMDGPU RAS Reboot Behavior for Unrecoverable Errors - -RAS Error Count sysfs Interface -------------------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c - :doc: AMDGPU RAS sysfs Error Count Interface - -RAS EEPROM debugfs Interface ----------------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c - :doc: AMDGPU RAS debugfs EEPROM table reset interface - -RAS VRAM Bad Pages sysfs Interface ----------------------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c - :doc: AMDGPU RAS sysfs gpu_vram_bad_pages Interface - -Sample Code ------------ -Sample code for testing error injection can be found here: -https://cgit.freedesktop.org/mesa/drm/tree/tests/amdgpu/ras_tests.c - -This is part of the libdrm amdgpu unit tests which cover several areas of the GPU. -There are four sets of tests: - -RAS Basic Test - -The test verifies the RAS feature enabled status and makes sure the necessary sysfs and debugfs files -are present. - -RAS Query Test - -This test checks the RAS availability and enablement status for each supported IP block as well as -the error counts. - -RAS Inject Test - -This test injects errors for each IP. - -RAS Disable Test - -This test tests disabling of RAS features for each IP block. - - -GPU Power/Thermal Controls and Monitoring -========================================= - -This section covers hwmon and power/thermal controls. - -HWMON Interfaces ----------------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: hwmon - -GPU sysfs Power State Interfaces --------------------------------- - -GPU power controls are exposed via sysfs files. - -power_dpm_state -~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: power_dpm_state - -power_dpm_force_performance_level -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: power_dpm_force_performance_level - -pp_table -~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: pp_table - -pp_od_clk_voltage -~~~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: pp_od_clk_voltage - -pp_dpm_* -~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk pp_dpm_pcie - -pp_power_profile_mode -~~~~~~~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: pp_power_profile_mode - -\*_busy_percent -~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: gpu_busy_percent - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: mem_busy_percent - -gpu_metrics -~~~~~~~~~~~~~~~~~~~~~ - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: gpu_metrics - -GPU Product Information -======================= - -Information about the GPU can be obtained on certain cards -via sysfs - -product_name ------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c - :doc: product_name - -product_number --------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c - :doc: product_name - -serial_number -------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c - :doc: serial_number - -unique_id ---------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: unique_id - -GPU Memory Usage Information -============================ - -Various memory accounting can be accessed via sysfs - -mem_info_vram_total -------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c - :doc: mem_info_vram_total - -mem_info_vram_used ------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c - :doc: mem_info_vram_used - -mem_info_vis_vram_total ------------------------ - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c - :doc: mem_info_vis_vram_total - -mem_info_vis_vram_used ----------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c - :doc: mem_info_vis_vram_used - -mem_info_gtt_total ------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c - :doc: mem_info_gtt_total - -mem_info_gtt_used ------------------ - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c - :doc: mem_info_gtt_used - -PCIe Accounting Information -=========================== - -pcie_bw -------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: pcie_bw - -pcie_replay_count ------------------ - -.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c - :doc: pcie_replay_count - -GPU SmartShift Information -========================== - -GPU SmartShift information via sysfs - -smartshift_apu_power --------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: smartshift_apu_power - -smartshift_dgpu_power ---------------------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: smartshift_dgpu_power - -smartshift_bias ---------------- - -.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c - :doc: smartshift_bias diff --git a/Documentation/gpu/amdgpu/amdgpu-glossary.rst b/Documentation/gpu/amdgpu/amdgpu-glossary.rst new file mode 100644 index 000000000000..326896e9800d --- /dev/null +++ b/Documentation/gpu/amdgpu/amdgpu-glossary.rst @@ -0,0 +1,100 @@ +=============== +AMDGPU Glossary +=============== + +Here you can find some generic acronyms used in the amdgpu driver. Notice that +we have a dedicated glossary for Display Core at +'Documentation/gpu/amdgpu/display/dc-glossary.rst'. + +.. glossary:: + + active_cu_number + The number of CUs that are active on the system. The number of active + CUs may be less than SE * SH * CU depending on the board configuration. + + CP + Command Processor + + CPLIB + Content Protection Library + + CU + Compute Unit + + DFS + Digital Frequency Synthesizer + + ECP + Enhanced Content Protection + + EOP + End Of Pipe/Pipeline + + GC + Graphics and Compute + + GMC + Graphic Memory Controller + + IH + Interrupt Handler + + HQD + Hardware Queue Descriptor + + IB + Indirect Buffer + + IP + Intellectual Property blocks + + KCQ + Kernel Compute Queue + + KGQ + Kernel Graphics Queue + + KIQ + Kernel Interface Queue + + MEC + MicroEngine Compute + + MES + MicroEngine Scheduler + + MMHUB + Multi-Media HUB + + MQD + Memory Queue Descriptor + + PPLib + PowerPlay Library - PowerPlay is the power management component. + + PSP + Platform Security Processor + + RLC + RunList Controller + + SDMA + System DMA + + SE + Shader Engine + + SH + SHader array + + SMU + System Management Unit + + SS + Spread Spectrum + + VCE + Video Compression Engine + + VCN + Video Codec Next diff --git a/Documentation/gpu/amdgpu/apu-asic-info-table.csv b/Documentation/gpu/amdgpu/apu-asic-info-table.csv new file mode 100644 index 000000000000..98c6988e424e --- /dev/null +++ b/Documentation/gpu/amdgpu/apu-asic-info-table.csv @@ -0,0 +1,8 @@ +Product Name, Code Reference, DCN/DCE version, GC version, VCE/UVD/VCN version, SDMA version +Radeon R* Graphics, CARRIZO/STONEY, DCE 11, 8, VCE 3 / UVD 6, 3 +Ryzen 3000 series / AMD Ryzen Embedded V1*/R1* with Radeon Vega Gfx, RAVEN/PICASSO, DCN 1.0, 9.1.0, VCN 1.0, 4.1.0 +Ryzen 4000 series, RENOIR, DCN 2.1, 9.3, VCN 2.2, 4.1.2 +Ryzen 3000 series / AMD Ryzen Embedded V1*/R1* with Radeon Vega Gfx, RAVEN2, DCN 1.0, 9.2.2, VCN 1.0.1, 4.1.1 +SteamDeck, VANGOGH, DCN 3.0.1, 10.3.1, VCN 3.1.0, 5.2.1 +Ryzen 5000 series, GREEN SARDINE, DCN 2.1, 9.3, VCN 2.2, 4.1.1 +Ryzen 6000 Zen, YELLOW CARP, 3.1.2, 10.3.3, VCN 3.1.1, 5.2.3 diff --git a/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv b/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv new file mode 100644 index 000000000000..84617aa35dab --- /dev/null +++ b/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv @@ -0,0 +1,24 @@ +Product Name, Code Reference, DCN/DCE version, GC version, VCN version, SDMA version +AMD Radeon (TM) HD 8500M/ 8600M /M200 /M320 /M330 /M335 Series, HAINAN, --, 6, --, -- +AMD Radeon HD 7800 /7900 /FireGL Series, TAHITI, DCE 6, 6, VCE 1 / UVD 3, -- +AMD Radeon R7 (TM|HD) M265 /M370 /8500M /8600 /8700 /8700M, OLAND, DCE 6, 6, VCE 1 / UVD 3, -- +AMD Radeon (TM) (HD|R7) 7800 /7970 /8800 /8970 /370/ Series, PITCAIRN, DCE 6, 6, VCE 1 / UVD 3, -- +AMD Radeon (TM|R7|R9|HD) E8860 /M360 /7700 /7800 /8800 /9000(M) /W4100 Series, VERDE, DCE 6, 6, VCE 1 / UVD 3, -- +AMD Radeon HD M280X /M380 /7700 /8950 /W5100, BONAIRE, DCE 8, 7, VCE 2 / UVD 4.2, 1 +AMD Radeon (R9|TM) 200 /390 /W8100 /W9100 Series, HAWAII, DCE 8, 7, VCE 2 / UVD 4.2, 1 +AMD Radeon (TM) R(5|7) M315 /M340 /M360, TOPAZ, *, 8, --, 2 +AMD Radeon (TM) R9 200 /380 /W7100 /S7150 /M390 /M395 Series, TONGA, DCE 10, 8, VCE 3 / UVD 5, 3 +AMD Radeon (FirePro) (TM) R9 Fury Series, FIJI, DCE 10, 8, VCE 3 / UVD 6, 3 +Radeon RX 470 /480 /570 /580 /590 Series - AMD Radeon (TM) (Pro WX) 5100 /E9390 /E9560 /E9565 /V7350 /7100 /P30PH, POLARIS10, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3 +Radeon (TM) (RX|Pro WX) E9260 /460 /V5300X /550 /560(X) Series, POLARIS11, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3 +Radeon (RX/Pro) 500 /540(X) /550 /640 /WX2100 /WX3100 /WX200 Series, POLARIS12, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3 +Radeon (RX|TM) (PRO|WX) Vega /MI25 /V320 /V340L /8200 /9100 /SSG MxGPU, VEGA10, DCE 12, 9.0.1, VCE 4.0.0 / UVD 7.0.0, 4.0.0 +AMD Radeon (Pro) VII /MI50 /MI60, VEGA20, DCE 12, 9.4.0, VCE 4.1.0 / UVD 7.2.0, 4.2.0 +MI100, ARCTURUS, *, 9.4.1, VCN 2.5.0, 4.2.2 +MI200, ALDEBARAN, *, 9.4.2, VCN 2.6.0, 4.4.0 +AMD Radeon (RX|Pro) 5600(M|XT) /5700 (M|XT|XTB) /W5700, NAVI10, DCN 2.0.0, 10.1.10, VCN 2.0.0, 5.0.0 +AMD Radeon (Pro) 5300 /5500XTB/5500(XT|M) 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b/Documentation/gpu/amdgpu/display/dc-debug.rst new file mode 100644 index 000000000000..40c55a618918 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dc-debug.rst @@ -0,0 +1,77 @@ +======================== +Display Core Debug tools +======================== + +DC Visual Confirmation +====================== + +Display core provides a feature named visual confirmation, which is a set of +bars added at the scanout time by the driver to convey some specific +information. In general, you can enable this debug option by using:: + + echo <N> > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +Where `N` is an integer number for some specific scenarios that the developer +wants to enable, you will see some of these debug cases in the following +subsection. + +Multiple Planes Debug +--------------------- + +If you want to enable or debug multiple planes in a specific user-space +application, you can leverage a debug feature named visual confirm. For +enabling it, you will need:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +You need to reload your GUI to see the visual confirmation. When the plane +configuration changes or a full update occurs there will be a colored bar at +the bottom of each hardware plane being drawn on the screen. + +* The color indicates the format - For example, red is AR24 and green is NV12 +* The height of the bar indicates the index of the plane +* Pipe split can be observed if there are two bars with a difference in height + covering the same plane + +Consider the video playback case in which a video is played in a specific +plane, and the desktop is drawn in another plane. The video plane should +feature one or two green bars at the bottom of the video depending on pipe +split configuration. + +* There should **not** be any visual corruption +* There should **not** be any underflow or screen flashes +* There should **not** be any black screens +* There should **not** be any cursor corruption +* Multiple plane **may** be briefly disabled during window transitions or + resizing but should come back after the action has finished + +Pipe Split Debug +---------------- + +Sometimes we need to debug if DCN is splitting pipes correctly, and visual +confirmation is also handy for this case. Similar to the MPO case, you can use +the below command to enable visual confirmation:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +In this case, if you have a pipe split, you will see one small red bar at the +bottom of the display covering the entire display width and another bar +covering the second pipe. In other words, you will see a bit high bar in the +second pipe. + +DTN Debug +========= + +DC (DCN) provides an extensive log that dumps multiple details from our +hardware configuration. Via debugfs, you can capture those status values by +using Display Test Next (DTN) log, which can be captured via debugfs by using:: + + cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +Since this log is updated accordingly with DCN status, you can also follow the +change in real-time by using something like:: + + sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +When reporting a bug related to DC, consider attaching this log before and +after you reproduce the bug. diff --git a/Documentation/gpu/amdgpu/display/dc-glossary.rst b/Documentation/gpu/amdgpu/display/dc-glossary.rst new file mode 100644 index 000000000000..0b0ffd428dd2 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dc-glossary.rst @@ -0,0 +1,237 @@ +=========== +DC Glossary +=========== + +On this page, we try to keep track of acronyms related to the display +component. If you do not find what you are looking for, look at the +'Documentation/gpu/amdgpu/amdgpu-glossary.rst'; if you cannot find it anywhere, +consider asking in the amdgfx and update this page. + +.. glossary:: + + ABM + Adaptive Backlight Modulation + + APU + Accelerated Processing Unit + + ASIC + Application-Specific Integrated Circuit + + ASSR + Alternate Scrambler Seed Reset + + AZ + Azalia (HD audio DMA engine) + + BPC + Bits Per Colour/Component + + BPP + Bits Per Pixel + + Clocks + * PCLK: Pixel Clock + * SYMCLK: Symbol Clock + * SOCCLK: GPU Engine Clock + * DISPCLK: Display Clock + * DPPCLK: DPP Clock + * DCFCLK: Display Controller Fabric Clock + * REFCLK: Real Time Reference Clock + * PPLL: Pixel PLL + * FCLK: Fabric Clock + * MCLK: Memory Clock + + CRC + Cyclic Redundancy Check + + CRTC + Cathode Ray Tube Controller - commonly called "Controller" - Generates + raw stream of pixels, clocked at pixel clock + + CVT + Coordinated Video Timings + + DAL + Display Abstraction layer + + DC (Software) + Display Core + + DC (Hardware) + Display Controller + + DCC + Delta Colour Compression + + DCE + Display Controller Engine + + DCHUB + Display Controller HUB + + ARB + Arbiter + + VTG + Vertical Timing Generator + + DCN + Display Core Next + + DCCG + Display Clock Generator block + + DDC + Display Data Channel + + DIO + Display IO + + DPP + Display Pipes and Planes + + DSC + Display Stream Compression (Reduce the amount of bits to represent pixel + count while at the same pixel clock) + + dGPU + discrete GPU + + DMIF + Display Memory Interface + + DML + Display Mode Library + + DMCU + Display Micro-Controller Unit + + DMCUB + Display Micro-Controller Unit, version B + + DPCD + DisplayPort Configuration Data + + DPM(S) + Display Power Management (Signaling) + + DRR + Dynamic Refresh Rate + + DWB + Display Writeback + + FB + Frame Buffer + + FBC + Frame Buffer Compression + + FEC + Forward Error Correction + + FRL + Fixed Rate Link + + GCO + Graphical Controller Object + + GSL + Global Swap Lock + + iGPU + integrated GPU + + ISR + Interrupt Service Request + + ISV + Independent Software Vendor + + KMD + Kernel Mode Driver + + LB + Line Buffer + + LFC + Low Framerate Compensation + + LTTPR + Link Training Tunable Phy Repeater + + LUT + Lookup Table + + MALL + Memory Access at Last Level + + MC + Memory Controller + + MPC/MPCC + Multiple pipes and plane combine + + MPO + Multi Plane Overlay + + MST + Multi Stream Transport + + NBP State + Northbridge Power State + + NBIO + North Bridge Input/Output + + ODM + Output Data Mapping + + OPM + Output Protection Manager + + OPP + Output Plane Processor + + OPTC + Output Pipe Timing Combiner + + OTG + Output Timing Generator + + PCON + Power Controller + + PGFSM + Power Gate Finite State Machine + + PSR + Panel Self Refresh + + SCL + Scaler + + SDP + Scalable Data Port + + SLS + Single Large Surface + + SST + Single Stream Transport + + TMDS + Transition-Minimized Differential Signaling + + TMZ + Trusted Memory 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style="font-style:normal;font-weight:normal;font-size:3.17499995px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332" + x="-142.71655" + y="25.939869" + id="text6980-9"><tspan + sodipodi:role="line" + id="tspan6978-1" + x="-142.71655" + y="25.939869" + style="font-size:4.58611107px;stroke-width:0.26458332">Notes</tspan></text> + </g> +</svg> diff --git a/Documentation/gpu/amdgpu/display/dcn-overview.rst b/Documentation/gpu/amdgpu/display/dcn-overview.rst new file mode 100644 index 000000000000..9fea6500448b --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dcn-overview.rst @@ -0,0 +1,230 @@ +======================= +Display Core Next (DCN) +======================= + +To equip our readers with the basic knowledge of how AMD Display Core Next +(DCN) works, we need to start with an overview of the hardware pipeline. Below +you can see a picture that provides a DCN overview, keep in mind that this is a +generic diagram, and we have variations per ASIC. + +.. kernel-figure:: dc_pipeline_overview.svg + +Based on this diagram, we can pass through each block and briefly describe +them: + +* **Display Controller Hub (DCHUB)**: This is the gateway between the Scalable + Data Port (SDP) and DCN. This component has multiple features, such as memory + arbitration, rotation, and cursor manipulation. + +* **Display Pipe and Plane (DPP)**: This block provides pre-blend pixel + processing such as color space conversion, linearization of pixel data, tone + mapping, and gamut mapping. + +* **Multiple Pipe/Plane Combined (MPC)**: This component performs blending of + multiple planes, using global or per-pixel alpha. + +* **Output Pixel Processing (OPP)**: Process and format pixels to be sent to + the display. + +* **Output Pipe Timing Combiner (OPTC)**: It generates time output to combine + streams or divide capabilities. CRC values are generated in this block. + +* **Display Output (DIO)**: Codify the output to the display connected to our + GPU. + +* **Display Writeback (DWB)**: It provides the ability to write the output of + the display pipe back to memory as video frames. + +* **Multi-Media HUB (MMHUBBUB)**: Memory controller interface for DMCUB and DWB + (Note that DWB is not hooked yet). + +* **DCN Management Unit (DMU)**: It provides registers with access control and + interrupts the controller to the SOC host interrupt unit. This block includes + the Display Micro-Controller Unit - version B (DMCUB), which is handled via + firmware. + +* **DCN Clock Generator Block (DCCG)**: It provides the clocks and resets + for all of the display controller clock domains. + +* **Azalia (AZ)**: Audio engine. + +The above diagram is an architecture generalization of DCN, which means that +every ASIC has variations around this base model. Notice that the display +pipeline is connected to the Scalable Data Port (SDP) via DCHUB; you can see +the SDP as the element from our Data Fabric that feeds the display pipe. + +Always approach the DCN architecture as something flexible that can be +configured and reconfigured in multiple ways; in other words, each block can be +setup or ignored accordingly with userspace demands. For example, if we +want to drive an 8k@60Hz with a DSC enabled, our DCN may require 4 DPP and 2 +OPP. It is DC's responsibility to drive the best configuration for each +specific scenario. Orchestrate all of these components together requires a +sophisticated communication interface which is highlighted in the diagram by +the edges that connect each block; from the chart, each connection between +these blocks represents: + +1. Pixel data interface (red): Represents the pixel data flow; +2. Global sync signals (green): It is a set of synchronization signals composed + by VStartup, VUpdate, and VReady; +3. Config interface: Responsible to configure blocks; +4. Sideband signals: All other signals that do not fit the previous one. + +These signals are essential and play an important role in DCN. Nevertheless, +the Global Sync deserves an extra level of detail described in the next +section. + +All of these components are represented by a data structure named dc_state. +From DCHUB to MPC, we have a representation called dc_plane; from MPC to OPTC, +we have dc_stream, and the output (DIO) is handled by dc_link. Keep in mind +that HUBP accesses a surface using a specific format read from memory, and our +dc_plane should work to convert all pixels in the plane to something that can +be sent to the display via dc_stream and dc_link. + +Front End and Back End +---------------------- + +Display pipeline can be broken down into two components that are usually +referred as **Front End (FE)** and **Back End (BE)**, where FE consists of: + +* DCHUB (Mainly referring to a subcomponent named HUBP) +* DPP +* MPC + +On the other hand, BE consist of + +* OPP +* OPTC +* DIO (DP/HDMI stream encoder and link encoder) + +OPP and OPTC are two joining blocks between FE and BE. On a side note, this is +a one-to-one mapping of the link encoder to PHY, but we can configure the DCN +to choose which link encoder to connect to which PHY. FE's main responsibility +is to change, blend and compose pixel data, while BE's job is to frame a +generic pixel stream to a specific display's pixel stream. + +Data Flow +--------- + +Initially, data is passed in from VRAM through Data Fabric (DF) in native pixel +formats. Such data format stays through till HUBP in DCHUB, where HUBP unpacks +different pixel formats and outputs them to DPP in uniform streams through 4 +channels (1 for alpha + 3 for colors). + +The Converter and Cursor (CNVC) in DPP would then normalize the data +representation and convert them to a DCN specific floating-point format (i.e., +different from the IEEE floating-point format). In the process, CNVC also +applies a degamma function to transform the data from non-linear to linear +space to relax the floating-point calculations following. Data would stay in +this floating-point format from DPP to OPP. + +Starting OPP, because color transformation and blending have been completed +(i.e alpha can be dropped), and the end sinks do not require the precision and +dynamic range that floating points provide (i.e. all displays are in integer +depth format), bit-depth reduction/dithering would kick in. In OPP, we would +also apply a regamma function to introduce the gamma removed earlier back. +Eventually, we output data in integer format at DIO. + +AMD Hardware Pipeline +--------------------- + +When discussing graphics on Linux, the **pipeline** term can sometimes be +overloaded with multiple meanings, so it is important to define what we mean +when we say **pipeline**. In the DCN driver, we use the term **hardware +pipeline** or **pipeline** or just **pipe** as an abstraction to indicate a +sequence of DCN blocks instantiated to address some specific configuration. DC +core treats DCN blocks as individual resources, meaning we can build a pipeline +by taking resources for all individual hardware blocks to compose one pipeline. +In actuality, we can't connect an arbitrary block from one pipe to a block from +another pipe; they are routed linearly, except for DSC, which can be +arbitrarily assigned as needed. We have this pipeline concept for trying to +optimize bandwidth utilization. + +.. kernel-figure:: pipeline_4k_no_split.svg + +Additionally, let's take a look at parts of the DTN log (see +'Documentation/gpu/amdgpu/display/dc-debug.rst' for more information) since +this log can help us to see part of this pipeline behavior in real-time:: + + HUBP: format addr_hi width height ... + [ 0]: 8h 81h 3840 2160 + [ 1]: 0h 0h 0 0 + [ 2]: 0h 0h 0 0 + [ 3]: 0h 0h 0 0 + [ 4]: 0h 0h 0 0 + ... + MPCC: OPP DPP ... + [ 0]: 0h 0h ... + +The first thing to notice from the diagram and DTN log it is the fact that we +have different clock domains for each part of the DCN blocks. In this example, +we have just a single **pipeline** where the data flows from DCHUB to DIO, as +we intuitively expect. Nonetheless, DCN is flexible, as mentioned before, and +we can split this single pipe differently, as described in the below diagram: + +.. kernel-figure:: pipeline_4k_split.svg + +Now, if we inspect the DTN log again we can see some interesting changes:: + + HUBP: format addr_hi width height ... + [ 0]: 8h 81h 1920 2160 ... + ... + [ 4]: 0h 0h 0 0 ... + [ 5]: 8h 81h 1920 2160 ... + ... + MPCC: OPP DPP ... + [ 0]: 0h 0h ... + [ 5]: 0h 5h ... + +From the above example, we now split the display pipeline into two vertical +parts of 1920x2160 (i.e., 3440x2160), and as a result, we could reduce the +clock frequency in the DPP part. This is not only useful for saving power but +also to better handle the required throughput. The idea to keep in mind here is +that the pipe configuration can vary a lot according to the display +configuration, and it is the DML's responsibility to set up all required +configuration parameters for multiple scenarios supported by our hardware. + +Global Sync +----------- + +Many DCN registers are double buffered, most importantly the surface address. +This allows us to update DCN hardware atomically for page flips, as well as +for most other updates that don't require enabling or disabling of new pipes. + +(Note: There are many scenarios when DC will decide to reserve extra pipes +in order to support outputs that need a very high pixel clock, or for +power saving purposes.) + +These atomic register updates are driven by global sync signals in DCN. In +order to understand how atomic updates interact with DCN hardware, and how DCN +signals page flip and vblank events it is helpful to understand how global sync +is programmed. + +Global sync consists of three signals, VSTARTUP, VUPDATE, and VREADY. These are +calculated by the Display Mode Library - DML (drivers/gpu/drm/amd/display/dc/dml) +based on a large number of parameters and ensure our hardware is able to feed +the DCN pipeline without underflows or hangs in any given system configuration. +The global sync signals always happen during VBlank, are independent from the +VSync signal, and do not overlap each other. + +VUPDATE is the only signal that is of interest to the rest of the driver stack +or userspace clients as it signals the point at which hardware latches to +atomically programmed (i.e. double buffered) registers. Even though it is +independent of the VSync signal we use VUPDATE to signal the VSync event as it +provides the best indication of how atomic commits and hardware interact. + +Since DCN hardware is double-buffered the DC driver is able to program the +hardware at any point during the frame. + +The below picture illustrates the global sync signals: + +.. kernel-figure:: global_sync_vblank.svg + +These signals affect core DCN behavior. Programming them incorrectly will lead +to a number of negative consequences, most of them quite catastrophic. + +The following picture shows how global sync allows for a mailbox style of +updates, i.e. it allows for multiple re-configurations between VUpdate +events where only the last configuration programmed before the VUpdate signal +becomes effective. + +.. kernel-figure:: config_example.svg diff --git a/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg new file mode 100644 index 000000000000..315ffc5a1a4b --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg @@ -0,0 +1,1370 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + version="1.1" + id="svg2019" + width="1702" + height="1845" + viewBox="0 0 1702 1845" + sodipodi:docname="dcn2_cm_drm_current.svg" + inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)" + 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y="218.74973" + style="font-size:18.6667px">format</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="911.99878" + y="284.74973" + id="text104657"><tspan + sodipodi:role="line" + id="tspan104655" + x="911.99878" + y="284.74973" + style="font-size:18.6667px">bias_and_scale</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="887.99878" + y="346.74973" + id="text104661"><tspan + sodipodi:role="line" + id="tspan104659" + x="887.99878" + y="346.74973" + style="font-size:18.6667px">color space matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="871.99878" + y="442.74973" + id="text104665"><tspan + sodipodi:role="line" + id="tspan104663" + x="871.99878" + y="442.74973" + style="font-size:18.6667px">input_csc_color_matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="905.99878" + y="586.74976" + id="text125075"><tspan + sodipodi:role="line" + id="tspan125073" + x="905.99878" + y="586.74976" + style="font-size:18.6667px">in_transfer_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="945.0083" + y="702.85938" + id="text117309"><tspan + sodipodi:role="line" + id="tspan117307" + x="945.0083" + y="702.85938" + style="font-size:18.6667px">hdr_mult</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="874.5556" + y="773.42615" + id="text117309-6"><tspan + sodipodi:role="line" + id="tspan117307-7" + x="874.5556" + y="773.42615" + style="font-size:18.6667px">gamut_remap_matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="913.72528" + y="846.55896" + id="text117309-5"><tspan + sodipodi:role="line" + id="tspan117307-3" + x="913.72528" + y="846.55896" + style="font-size:18.6667px">in_shaper_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="937.72528" + y="918.25787" + id="text117309-56"><tspan + sodipodi:role="line" + id="tspan117307-2" + x="937.72528" + y="918.25787" + style="font-size:18.6667px">lut3d_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="945.9895" + y="986.10767" + id="text117309-9"><tspan + sodipodi:role="line" + id="tspan117307-1" + x="945.9895" + y="986.10767" + style="font-size:18.6667px">blend_tf</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="975.91803" + y="1224.5564" + id="text137434"><tspan + sodipodi:role="line" + id="tspan137432" + x="975.91803" + y="1224.5564" + style="font-size:18.6667px">Blender</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="879.31372" + y="1283.4249" + id="text137434-2"><tspan + sodipodi:role="line" + id="tspan137432-7" + x="879.31372" + y="1283.4249" + style="font-size:18.6667px">gamut_remap_matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="925.31372" + y="1359.2747" + id="text137434-0"><tspan + sodipodi:role="line" + id="tspan137432-9" + x="925.31372" + y="1359.2747" + style="font-size:18.6667px">func_shaper</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="930.33252" + y="1430.2566" + id="text137434-3"><tspan + sodipodi:role="line" + id="tspan137432-6" + x="930.33252" + y="1430.2566" + style="font-size:18.6667px">lut3d_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="900.18158" + y="1504.6725" + id="text137434-06"><tspan + sodipodi:role="line" + id="tspan137432-2" + x="900.18158" + y="1504.6725" + style="font-size:18.6667px">out_transfer_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="904.0307" + y="1575.8053" + id="text137434-6"><tspan + sodipodi:role="line" + id="tspan137432-1" + x="904.0307" + y="1575.8053" + style="font-size:18.6667px">csc_color_matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="903.16278" + y="1642.1078" + id="text137434-8"><tspan + sodipodi:role="line" + id="tspan137432-79" + x="903.16278" + y="1642.1078" + style="font-size:18.6667px">bit_depth_param</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="939.31372" + y="1713.8068" + id="text137434-20"><tspan + sodipodi:role="line" + id="tspan137432-23" + x="939.31372" + y="1713.8068" + style="font-size:18.6667px">clamping</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="894.0307" + y="1782.5244" + id="text137434-7"><tspan + sodipodi:role="line" + id="tspan137432-5" + x="894.0307" + y="1782.5244" + style="font-size:18.6667px">output_color_space</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="869.63062" + y="117.7968" + id="text176429"><tspan + sodipodi:role="line" + id="tspan176427" + x="869.63062" + y="117.7968" + style="font-size:18.6667px">Plane</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="27.605465" + y="162.20587" + id="text176429-2"><tspan + sodipodi:role="line" + id="tspan176427-0" + x="27.605465" + y="162.20587" + style="font-size:18.6667px">Legend</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="298.63959" + y="59.293999" + id="text176429-9"><tspan + sodipodi:role="line" + id="tspan176427-2" + x="298.63959" + y="59.293999" + style="font-size:18.6667px">DCN 3.0</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="826.65735" + y="59.458061" + id="text176429-66"><tspan + sodipodi:role="line" + id="tspan176427-4" + x="826.65735" + y="59.458061" + style="font-size:18.6667px">DC Interface</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="1362.9948" + y="59.458061" + id="text176429-95"><tspan + sodipodi:role="line" + id="tspan176427-04" + x="1362.9948" + y="59.458061" + style="font-size:18.6667px">DRM Interface</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:40px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="867.34656" + y="1194.5068" + id="text184728"><tspan + sodipodi:role="line" + id="tspan184726" + x="867.34656" + y="1194.5068" /></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="389.01593" + y="159.8909" + id="text64469-9-3"><tspan + sodipodi:role="line" + id="tspan64467-2-6" + x="389.01593" + y="159.8909" + style="font-size:18.6667px">CNVC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="365.88379" + y="303.59048" + id="text64469-9-1"><tspan + sodipodi:role="line" + id="tspan64467-2-2" + x="365.88379" + y="303.59048" + style="font-size:18.6667px">Input CSC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="413.06488" + y="390.95001" + id="text64469-9-93"><tspan + sodipodi:role="line" + id="tspan64467-2-1" + x="413.06488" + y="390.95001" + style="font-size:18.6667px;text-align:center;text-anchor:middle">DeGamma</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="414.28339" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan233797">ROM</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="437.61676" + style="font-size:10.6667px;text-align:center;text-anchor:middle" + id="tspan233799">(sRGB, BT2020, Gamma 2.2,</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="460.95013" + style="font-size:10.6667px;text-align:center;text-anchor:middle" + id="tspan242597">PQ, HLG)</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="372.44986" + y="538.83807" + id="text64469-9-94"><tspan + sodipodi:role="line" + id="tspan64467-2-78" + x="372.44986" + y="538.83807" + style="font-size:18.6667px">Post CSC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:16px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="335.31775" + y="622.23511" + id="text64469-9-4"><tspan + sodipodi:role="line" + id="tspan64467-2-5" + x="335.31775" + y="622.23511" + style="font-size:16px">Gamma Correction</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="351.16684" + y="700.34918" + id="text64469-9-0"><tspan + sodipodi:role="line" + id="tspan64467-2-3" + x="351.16684" + y="700.34918" + style="font-size:18.6667px">HDR Multiply</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="345.16684" + y="771.33112" + id="text64469-9-6"><tspan + sodipodi:role="line" + id="tspan64467-2-10" + x="345.16684" + y="771.33112" + style="font-size:18.6667px">Gamut Remap</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="412.5184" + y="836.04877" + id="text64469-9-63"><tspan + sodipodi:role="line" + id="tspan64467-2-20" + x="412.5184" + y="836.04877" + style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan + sodipodi:role="line" + x="412.5184" + y="859.38214" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan222533">RAM</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="413.54086" + y="908.61554" + id="text64469-9-61"><tspan + sodipodi:role="line" + id="tspan64467-2-55" + x="413.54086" + y="908.61554" + style="font-size:18.6667px;text-align:center;text-anchor:middle">3D LUT</tspan><tspan + sodipodi:role="line" + x="413.54086" + y="931.94891" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan221121">RAM</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="344.0347" + y="985.33319" + id="text64469-9-47"><tspan + sodipodi:role="line" + id="tspan64467-2-65" + x="344.0347" + y="985.33319" + style="font-size:18.6667px">Blend Gamma</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="433.84625" + y="1223.411" + id="text64469-9-69"><tspan + sodipodi:role="line" + id="tspan64467-2-37" + x="433.84625" + y="1223.411" + style="font-size:18.6667px">Blender</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="343.73291" + y="1290.2421" + id="text64469-9-45"><tspan + sodipodi:role="line" + id="tspan64467-2-25" + x="343.73291" + y="1290.2421" + style="font-size:18.6667px">Gamut Remap</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="408.74442" + y="1344.2428" + id="text64469-9-474"><tspan + sodipodi:role="line" + id="tspan64467-2-4" + x="408.74442" + y="1344.2428" + style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan + sodipodi:role="line" + x="408.74442" + y="1367.5762" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan208303">RAM</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="407.1257" + y="1420.2435" + id="text64469-9-30"><tspan + sodipodi:role="line" + id="tspan64467-2-786" + x="407.1257" + y="1420.2435" + style="font-size:18.6667px;text-align:center;text-anchor:middle">3D LUT</tspan><tspan + sodipodi:role="line" + x="407.1257" + y="1443.5769" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan204749">RAM</tspan></text> + <text + xml:space="preserve" + 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b/Documentation/gpu/amdgpu/display/display-manager.rst @@ -0,0 +1,183 @@ +====================== +AMDgpu Display Manager +====================== + +.. contents:: Table of Contents + :depth: 3 + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h + :internal: + +Lifecycle +========= + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: DM Lifecycle + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: dm_hw_init dm_hw_fini + +Interrupts +========== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c + :internal: + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: register_hpd_handlers dm_crtc_high_irq dm_pflip_high_irq + +Atomic Implementation +===================== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: atomic + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: amdgpu_dm_atomic_check amdgpu_dm_atomic_commit_tail + +Color Management Properties +=========================== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c + :internal: + + +DC Color Capabilities between DCN generations +--------------------------------------------- + +DRM/KMS framework defines three CRTC color correction properties: degamma, +color transformation matrix (CTM) and gamma, and two properties for degamma and +gamma LUT sizes. AMD DC programs some of the color correction features +pre-blending but DRM/KMS has not per-plane color correction properties. + +In general, the DRM CRTC color properties are programmed to DC, as follows: +CRTC gamma after blending, and CRTC degamma pre-blending. Although CTM is +programmed after blending, it is mapped to DPP hw blocks (pre-blending). Other +color caps available in the hw is not currently exposed by DRM interface and +are bypassed. + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :doc: color-management-caps + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :internal: + +The color pipeline has undergone major changes between DCN hardware +generations. What's possible to do before and after blending depends on +hardware capabilities, as illustrated below by the DCN 2.0 and DCN 3.0 families +schemas. + +**DCN 2.0 family color caps and mapping** + +.. kernel-figure:: dcn2_cm_drm_current.svg + +**DCN 3.0 family color caps and mapping** + +.. kernel-figure:: dcn3_cm_drm_current.svg + +Blend Mode Properties +===================== + +Pixel blend mode is a DRM plane composition property of :c:type:`drm_plane` used to +describes how pixels from a foreground plane (fg) are composited with the +background plane (bg). Here, we present main concepts of DRM blend mode to help +to understand how this property is mapped to AMD DC interface. See more about +this DRM property and the alpha blending equations in :ref:`DRM Plane +Composition Properties <plane_composition_properties>`. + +Basically, a blend mode sets the alpha blending equation for plane +composition that fits the mode in which the alpha channel affects the state of +pixel color values and, therefore, the resulted pixel color. For +example, consider the following elements of the alpha blending equation: + +- *fg.rgb*: Each of the RGB component values from the foreground's pixel. +- *fg.alpha*: Alpha component value from the foreground's pixel. +- *bg.rgb*: Each of the RGB component values from the background. +- *plane_alpha*: Plane alpha value set by the **plane "alpha" property**, see + more in :ref:`DRM Plane Composition Properties <plane_composition_properties>`. + +in the basic alpha blending equation:: + + out.rgb = alpha * fg.rgb + (1 - alpha) * bg.rgb + +the alpha channel value of each pixel in a plane is ignored and only the plane +alpha affects the resulted pixel color values. + +DRM has three blend mode to define the blend formula in the plane composition: + +* **None**: Blend formula that ignores the pixel alpha. + +* **Pre-multiplied**: Blend formula that assumes the pixel color values in a + plane was already pre-multiplied by its own alpha channel before storage. + +* **Coverage**: Blend formula that assumes the pixel color values were not + pre-multiplied with the alpha channel values. + +and pre-multiplied is the default pixel blend mode, that means, when no blend +mode property is created or defined, DRM considers the plane's pixels has +pre-multiplied color values. On IGT GPU tools, the kms_plane_alpha_blend test +provides a set of subtests to verify plane alpha and blend mode properties. + +The DRM blend mode and its elements are then mapped by AMDGPU display manager +(DM) to program the blending configuration of the Multiple Pipe/Plane Combined +(MPC), as follows: + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :doc: mpc-overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :functions: mpcc_blnd_cfg + +Therefore, the blending configuration for a single MPCC instance on the MPC +tree is defined by :c:type:`mpcc_blnd_cfg`, where +:c:type:`pre_multiplied_alpha` is the alpha pre-multiplied mode flag used to +set :c:type:`MPCC_ALPHA_MULTIPLIED_MODE`. It controls whether alpha is +multiplied (true/false), being only true for DRM pre-multiplied blend mode. +:c:type:`mpcc_alpha_blend_mode` defines the alpha blend mode regarding pixel +alpha and plane alpha values. It sets one of the three modes for +:c:type:`MPCC_ALPHA_BLND_MODE`, as described below. + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :functions: mpcc_alpha_blend_mode + +DM then maps the elements of `enum mpcc_alpha_blend_mode` to those in the DRM +blend formula, as follows: + +* *MPC pixel alpha* matches *DRM fg.alpha* as the alpha component value + from the plane's pixel +* *MPC global alpha* matches *DRM plane_alpha* when the pixel alpha should + be ignored and, therefore, pixel values are not pre-multiplied +* *MPC global gain* assumes *MPC global alpha* value when both *DRM + fg.alpha* and *DRM plane_alpha* participate in the blend equation + +In short, *fg.alpha* is ignored by selecting +:c:type:`MPCC_ALPHA_BLEND_MODE_GLOBAL_ALPHA`. On the other hand, (plane_alpha * +fg.alpha) component becomes available by selecting +:c:type:`MPCC_ALPHA_BLEND_MODE_PER_PIXEL_ALPHA_COMBINED_GLOBAL_GAIN`. And the +:c:type:`MPCC_ALPHA_MULTIPLIED_MODE` defines if the pixel color values are +pre-multiplied by alpha or not. + +Blend configuration flow +------------------------ + +The alpha blending equation is configured from DRM to DC interface by the +following path: + +1. When updating a :c:type:`drm_plane_state <drm_plane_state>`, DM calls + :c:type:`fill_blending_from_plane_state()` that maps + :c:type:`drm_plane_state <drm_plane_state>` attributes to + :c:type:`dc_plane_info <dc_plane_info>` struct to be handled in the + OS-agnostic component (DC). + +2. On DC interface, :c:type:`struct mpcc_blnd_cfg <mpcc_blnd_cfg>` programs the + MPCC blend configuration considering the :c:type:`dc_plane_info + <dc_plane_info>` input from DPP. diff --git a/Documentation/gpu/amdgpu/display/global_sync_vblank.svg b/Documentation/gpu/amdgpu/display/global_sync_vblank.svg new file mode 100644 index 000000000000..48f5dc4fd5d3 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/global_sync_vblank.svg @@ -0,0 +1,485 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="232.24133mm" + height="96.174995mm" + viewBox="0 0 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a/Documentation/gpu/amdgpu/display/index.rst b/Documentation/gpu/amdgpu/display/index.rst new file mode 100644 index 000000000000..f8a4f53d70d8 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/index.rst @@ -0,0 +1,32 @@ +.. _amdgpu-display-core: + +=================================== +drm/amd/display - Display Core (DC) +=================================== + +AMD display engine is partially shared with other operating systems; for this +reason, our Display Core Driver is divided into two pieces: + +1. **Display Core (DC)** contains the OS-agnostic components. Things like + hardware programming and resource management are handled here. +2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the + amdgpu base driver and DRM are implemented here. + +The display pipe is responsible for "scanning out" a rendered frame from the +GPU memory (also called VRAM, FrameBuffer, etc.) to a display. In other words, +it would: + +1. Read frame information from memory; +2. Perform required transformation; +3. Send pixel data to sink devices. + +If you want to learn more about our driver details, take a look at the below +table of content: + +.. toctree:: + + display-manager.rst + dc-debug.rst + dcn-overview.rst + mpo-overview.rst + dc-glossary.rst diff --git a/Documentation/gpu/amdgpu/display/mpo-cursor.svg b/Documentation/gpu/amdgpu/display/mpo-cursor.svg new file mode 100644 index 000000000000..9d9de76847c3 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/mpo-cursor.svg @@ -0,0 +1,435 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="160.5318mm" + 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composited via +fixed-function hardware in the display controller rather than using graphics or +compute shaders for composition. This can yield some power savings if it means +the graphics/compute pipelines can be put into low-power states. In summary, +MPO can bring the following benefits: + +* Decreased GPU and CPU workload - no composition shaders needed, no extra + buffer copy needed, GPU can remain idle. +* Plane independent page flips - No need to be tied to global compositor + page-flip present rate, reduced latency, independent timing. + +.. note:: Keep in mind that MPO is all about power-saving; if you want to learn + more about power-save in the display context, check the link: + `Power <https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/power.rst>`__. + +Multiplane Overlay is only available using the DRM atomic model. The atomic +model only uses a single userspace IOCTL for configuring the display hardware +(modesetting, page-flipping, etc) - drmModeAtomicCommit. To query hardware +resources and limitations userspace also calls into drmModeGetResources which +reports back the number of planes, CRTCs, and connectors. There are three types +of DRM planes that the driver can register and work with: + +* ``DRM_PLANE_TYPE_PRIMARY``: Primary planes represent a "main" plane for a + CRTC, primary planes are the planes operated upon by CRTC modesetting and + flipping operations. +* ``DRM_PLANE_TYPE_CURSOR``: Cursor planes represent a "cursor" plane for a + CRTC. Cursor planes are the planes operated upon by the cursor IOCTLs +* ``DRM_PLANE_TYPE_OVERLAY``: Overlay planes represent all non-primary, + non-cursor planes. Some drivers refer to these types of planes as "sprites" + internally. + +To illustrate how it works, let's take a look at a device that exposes the +following planes to userspace: + +* 4 Primary planes (1 per CRTC). +* 4 Cursor planes (1 per CRTC). +* 1 Overlay plane (shared among CRTCs). + +.. note:: Keep in mind that different ASICs might expose other numbers of + planes. + +For this hardware example, we have 4 pipes (if you don't know what AMD pipe +means, look at 'Documentation/gpu/amdgpu/display/dcn-overview.rst', section +"AMD Hardware Pipeline"). Typically most AMD devices operate in a pipe-split +configuration for optimal single display output (e.g., 2 pipes per plane). + +A typical MPO configuration from userspace - 1 primary + 1 overlay on a single +display - will see 4 pipes in use, 2 per plane. + +At least 1 pipe must be used per plane (primary and overlay), so for this +hypothetical hardware that we are using as an example, we have an absolute +limit of 4 planes across all CRTCs. Atomic commits will be rejected for display +configurations using more than 4 planes. Again, it is important to stress that +every DCN has different restrictions; here, we are just trying to provide the +concept idea. + +Plane Restrictions +================== + +AMDGPU imposes restrictions on the use of DRM planes in the driver. + +Atomic commits will be rejected for commits which do not follow these +restrictions: + +* Overlay planes must be in ARGB8888 or XRGB8888 format +* Planes cannot be placed outside of the CRTC destination rectangle +* Planes cannot be downscaled more than 1/4x of their original size +* Planes cannot be upscaled more than 16x of their original size + +Not every property is available on every plane: + +* Only primary planes have color-space and non-RGB format support +* Only overlay planes have alpha blending support + +Cursor Restrictions +=================== + +Before we start to describe some restrictions around cursor and MPO, see the +below image: + +.. kernel-figure:: mpo-cursor.svg + +The image on the left side represents how DRM expects the cursor and planes to +be blended. However, AMD hardware handles cursors differently, as you can see +on the right side; basically, our cursor cannot be drawn outside its associated +plane as it is being treated as part of the plane. Another consequence of that +is that cursors inherit the color and scale from the plane. + +As a result of the above behavior, do not use legacy API to set up the cursor +plane when working with MPO; otherwise, you might encounter unexpected +behavior. + +In short, AMD HW has no dedicated cursor planes. A cursor is attached to +another plane and therefore inherits any scaling or color processing from its +parent plane. + +Use Cases +========= + +Picture-in-Picture (PIP) playback - Underlay strategy +----------------------------------------------------- + +Video playback should be done using the "primary plane as underlay" MPO +strategy. This is a 2 planes configuration: + +* 1 YUV DRM Primary Plane (e.g. NV12 Video) +* 1 RGBA DRM Overlay Plane (e.g. ARGB8888 desktop). The compositor should + prepare the framebuffers for the planes as follows: + - The overlay plane contains general desktop UI, video player controls, and video subtitles + - Primary plane contains one or more videos + +.. note:: Keep in mind that we could extend this configuration to more planes, + but that is currently not supported by our driver yet (maybe if we have a + userspace request in the future, we can change that). + +See below a single-video example: + +.. kernel-figure:: single-display-mpo.svg + +.. note:: We could extend this behavior to more planes, but that is currently + not supported by our driver. + +The video buffer should be used directly for the primary plane. The video can +be scaled and positioned for the desktop using the properties: CRTC_X, CRTC_Y, +CRTC_W, and CRTC_H. The primary plane should also have the color encoding and +color range properties set based on the source content: + +* ``COLOR_RANGE``, ``COLOR_ENCODING`` + +The overlay plane should be the native size of the CRTC. The compositor must +draw a transparent cutout for where the video should be placed on the desktop +(i.e., set the alpha to zero). The primary plane video will be visible through +the underlay. The overlay plane's buffer may remain static while the primary +plane's framebuffer is used for standard double-buffered playback. + +The compositor should create a YUV buffer matching the native size of the CRTC. +Each video buffer should be composited onto this YUV buffer for direct YUV +scanout. The primary plane should have the color encoding and color range +properties set based on the source content: ``COLOR_RANGE``, +``COLOR_ENCODING``. However, be mindful that the source color space and +encoding match for each video since it affect the entire plane. + +The overlay plane should be the native size of the CRTC. The compositor must +draw a transparent cutout for where each video should be placed on the desktop +(i.e., set the alpha to zero). The primary plane videos will be visible through +the underlay. The overlay plane's buffer may remain static while compositing +operations for video playback will be done on the video buffer. + +This kernel interface is validated using IGT GPU Tools. The following tests can +be run to validate positioning, blending, scaling under a variety of sequences +and interactions with operations such as DPMS and S3: + +- ``kms_plane@plane-panning-bottom-right-pipe-*-planes`` +- ``kms_plane@plane-panning-bottom-right-suspend-pipe-*-`` +- ``kms_plane@plane-panning-top-left-pipe-*-`` +- ``kms_plane@plane-position-covered-pipe-*-`` +- ``kms_plane@plane-position-hole-dpms-pipe-*-`` +- ``kms_plane@plane-position-hole-pipe-*-`` +- ``kms_plane_multiple@atomic-pipe-*-tiling-`` +- ``kms_plane_scaling@pipe-*-plane-scaling`` +- ``kms_plane_alpha_blend@pipe-*-alpha-basic`` +- ``kms_plane_alpha_blend@pipe-*-alpha-transparant-fb`` +- ``kms_plane_alpha_blend@pipe-*-alpha-opaque-fb`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-min`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-mid`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-max`` + +Multiple Display MPO +-------------------- + +AMDGPU supports display MPO when using multiple displays; however, this feature +behavior heavily relies on the compositor implementation. Keep in mind that +usespace can define different policies. For example, some OSes can use MPO to +protect the plane that handles the video playback; notice that we don't have +many limitations for a single display. Nonetheless, this manipulation can have +many more restrictions for a multi-display scenario. The below example shows a +video playback in the middle of two displays, and it is up to the compositor to +define a policy on how to handle it: + +.. kernel-figure:: multi-display-hdcp-mpo.svg + +Let's discuss some of the hardware limitations we have when dealing with +multi-display with MPO. + +Limitations +~~~~~~~~~~~ + +For simplicity's sake, for discussing the hardware limitation, this +documentation supposes an example where we have two displays and video playback +that will be moved around different displays. + +* **Hardware limitations** + +From the DCN overview page, each display requires at least one pipe and each +MPO plane needs another pipe. As a result, when the video is in the middle of +the two displays, we need to use 2 pipes. See the example below where we avoid +pipe split: + +- 1 display (1 pipe) + MPO (1 pipe), we will use two pipes +- 2 displays (2 pipes) + MPO (1-2 pipes); we will use 4 pipes. MPO in the + middle of both displays needs 2 pipes. +- 3 Displays (3 pipes) + MPO (1-2 pipes), we need 5 pipes. + +If we use MPO with multiple displays, the userspace has to decide to enable +multiple MPO by the price of limiting the number of external displays supported +or disable it in favor of multiple displays; it is a policy decision. For +example: + +* When ASIC has 3 pipes, AMD hardware can NOT support 2 displays with MPO +* When ASIC has 4 pipes, AMD hardware can NOT support 3 displays with MPO + +Let's briefly explore how userspace can handle these two display configurations +on an ASIC that only supports three pipes. We can have: + +.. kernel-figure:: multi-display-hdcp-mpo-less-pipe-ex.svg + +- Total pipes are 3 +- User lights up 2 displays (2 out of 3 pipes are used) +- User launches video (1 pipe used for MPO) +- Now, if the user moves the video in the middle of 2 displays, one part of the + video won't be MPO since we have used 3/3 pipes. + +* **Scaling limitation** + +MPO cannot handle scaling less than 0.25 and more than x16. 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index 000000000000..ebf5932845a9 --- /dev/null +++ b/Documentation/gpu/amdgpu/driver-core.rst @@ -0,0 +1,182 @@ +============================ + Core Driver Infrastructure +============================ + +GPU Hardware Structure +====================== + +Each ASIC is a collection of hardware blocks. We refer to them as +"IPs" (Intellectual Property blocks). Each IP encapsulates certain +functionality. IPs are versioned and can also be mixed and matched. +E.g., you might have two different ASICs that both have System DMA (SDMA) 5.x IPs. +The driver is arranged by IPs. There are driver components to handle +the initialization and operation of each IP. There are also a bunch +of smaller IPs that don't really need much if any driver interaction. +Those end up getting lumped into the common stuff in the soc files. +The soc files (e.g., vi.c, soc15.c nv.c) contain code for aspects of +the SoC itself rather than specific IPs. E.g., things like GPU resets +and register access functions are SoC dependent. + +An APU contains more than just CPU and GPU, it also contains all of +the platform stuff (audio, usb, gpio, etc.). Also, a lot of +components are shared between the CPU, platform, and the GPU (e.g., +SMU, PSP, etc.). Specific components (CPU, GPU, etc.) usually have +their interface to interact with those common components. For things +like S0i3 there is a ton of coordination required across all the +components, but that is probably a bit beyond the scope of this +section. + +With respect to the GPU, we have the following major IPs: + +GMC (Graphics Memory Controller) + This was a dedicated IP on older pre-vega chips, but has since + become somewhat decentralized on vega and newer chips. They now + have dedicated memory hubs for specific IPs or groups of IPs. We + still treat it as a single component in the driver however since + the programming model is still pretty similar. This is how the + different IPs on the GPU get the memory (VRAM or system memory). + It also provides the support for per process GPU virtual address + spaces. + +IH (Interrupt Handler) + This is the interrupt controller on the GPU. All of the IPs feed + their interrupts into this IP and it aggregates them into a set of + ring buffers that the driver can parse to handle interrupts from + different IPs. + +PSP (Platform Security Processor) + This handles security policy for the SoC and executes trusted + applications, and validates and loads firmwares for other blocks. + +SMU (System Management Unit) + This is the power management microcontroller. It manages the entire + SoC. The driver interacts with it to control power management + features like clocks, voltages, power rails, etc. + +DCN (Display Controller Next) + This is the display controller. It handles the display hardware. + It is described in more details in :ref:`Display Core <amdgpu-display-core>`. + +SDMA (System DMA) + This is a multi-purpose DMA engine. The kernel driver uses it for + various things including paging and GPU page table updates. It's also + exposed to userspace for use by user mode drivers (OpenGL, Vulkan, + etc.) + +GC (Graphics and Compute) + This is the graphics and compute engine, i.e., the block that + encompasses the 3D pipeline and and shader blocks. This is by far the + largest block on the GPU. The 3D pipeline has tons of sub-blocks. In + addition to that, it also contains the CP microcontrollers (ME, PFP, + CE, MEC) and the RLC microcontroller. It's exposed to userspace for + user mode drivers (OpenGL, Vulkan, OpenCL, etc.) + +VCN (Video Core Next) + This is the multi-media engine. It handles video and image encode and + decode. It's exposed to userspace for user mode drivers (VA-API, + OpenMAX, etc.) + +Graphics and Compute Microcontrollers +------------------------------------- + +CP (Command Processor) + The name for the hardware block that encompasses the front end of the + GFX/Compute pipeline. Consists mainly of a bunch of microcontrollers + (PFP, ME, CE, MEC). The firmware that runs on these microcontrollers + provides the driver interface to interact with the GFX/Compute engine. + + MEC (MicroEngine Compute) + This is the microcontroller that controls the compute queues on the + GFX/compute engine. + + MES (MicroEngine Scheduler) + This is a new engine for managing queues. This is currently unused. + +RLC (RunList Controller) + This is another microcontroller in the GFX/Compute engine. It handles + power management related functionality within the GFX/Compute engine. + The name is a vestige of old hardware where it was originally added + and doesn't really have much relation to what the engine does now. + +Driver Structure +================ + +In general, the driver has a list of all of the IPs on a particular +SoC and for things like init/fini/suspend/resume, more or less just +walks the list and handles each IP. + +Some useful constructs: + +KIQ (Kernel Interface Queue) + This is a control queue used by the kernel driver to manage other gfx + and compute queues on the GFX/compute engine. You can use it to + map/unmap additional queues, etc. + +IB (Indirect Buffer) + A command buffer for a particular engine. Rather than writing + commands directly to the queue, you can write the commands into a + piece of memory and then put a pointer to the memory into the queue. + The hardware will then follow the pointer and execute the commands in + the memory, then returning to the rest of the commands in the ring. + +.. _amdgpu_memory_domains: + +Memory Domains +============== + +.. kernel-doc:: include/uapi/drm/amdgpu_drm.h + :doc: memory domains + +Buffer Objects +============== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c + :doc: amdgpu_object + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c + :internal: + +PRIME Buffer Sharing +==================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c + :doc: PRIME Buffer Sharing + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c + :internal: + +MMU Notifier +============ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c + :doc: MMU Notifier + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c + :internal: + +AMDGPU Virtual Memory +===================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c + :doc: GPUVM + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c + :internal: + +Interrupt Handling +================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c + :doc: Interrupt Handling + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c + :internal: + +IP Blocks +========= + +.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h + :doc: IP Blocks + +.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h + :identifiers: amd_ip_block_type amd_ip_funcs diff --git a/Documentation/gpu/amdgpu/driver-misc.rst b/Documentation/gpu/amdgpu/driver-misc.rst new file mode 100644 index 000000000000..1800543d45f7 --- /dev/null +++ b/Documentation/gpu/amdgpu/driver-misc.rst @@ -0,0 +1,129 @@ +================================ + Misc AMDGPU driver information +================================ + +GPU Product Information +======================= + +Information about the GPU can be obtained on certain cards +via sysfs + +product_name +------------ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c + :doc: product_name + +product_number +-------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c + :doc: product_name + +serial_number +------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c + :doc: serial_number + +unique_id +--------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: unique_id + +Accelerated Processing Units (APU) Info +--------------------------------------- + +.. csv-table:: + :header-rows: 1 + :widths: 3, 2, 2, 1, 1, 1 + :file: ./apu-asic-info-table.csv + +Discrete GPU Info +----------------- + +.. csv-table:: + :header-rows: 1 + :widths: 3, 2, 2, 1, 1, 1 + :file: ./dgpu-asic-info-table.csv + + +GPU Memory Usage Information +============================ + +Various memory accounting can be accessed via sysfs + +mem_info_vram_total +------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c + :doc: mem_info_vram_total + +mem_info_vram_used +------------------ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c + :doc: mem_info_vram_used + +mem_info_vis_vram_total +----------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c + :doc: mem_info_vis_vram_total + +mem_info_vis_vram_used +---------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c + :doc: mem_info_vis_vram_used + +mem_info_gtt_total +------------------ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c + :doc: mem_info_gtt_total + +mem_info_gtt_used +----------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c + :doc: mem_info_gtt_used + +PCIe Accounting Information +=========================== + +pcie_bw +------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: pcie_bw + +pcie_replay_count +----------------- + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c + :doc: pcie_replay_count + +GPU SmartShift Information +========================== + +GPU SmartShift information via sysfs + +smartshift_apu_power +-------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: smartshift_apu_power + +smartshift_dgpu_power +--------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: smartshift_dgpu_power + +smartshift_bias +--------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: smartshift_bias diff --git a/Documentation/gpu/amdgpu/index.rst b/Documentation/gpu/amdgpu/index.rst new file mode 100644 index 000000000000..a24e1cfa7407 --- /dev/null +++ b/Documentation/gpu/amdgpu/index.rst @@ -0,0 +1,17 @@ +========================== + drm/amdgpu AMDgpu driver +========================== + +The drm/amdgpu driver supports all AMD Radeon GPUs based on the Graphics Core +Next (GCN) architecture. + +.. toctree:: + + module-parameters + driver-core + display/index + xgmi + ras + thermal + driver-misc + amdgpu-glossary diff --git a/Documentation/gpu/amdgpu/module-parameters.rst b/Documentation/gpu/amdgpu/module-parameters.rst new file mode 100644 index 000000000000..ea538c8dda35 --- /dev/null +++ b/Documentation/gpu/amdgpu/module-parameters.rst @@ -0,0 +1,7 @@ +=================== + Module Parameters +=================== + +The amdgpu driver supports the following module parameters: + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c diff --git a/Documentation/gpu/amdgpu/ras.rst b/Documentation/gpu/amdgpu/ras.rst new file mode 100644 index 000000000000..047f76e395cf --- /dev/null +++ b/Documentation/gpu/amdgpu/ras.rst @@ -0,0 +1,62 @@ +==================== + AMDGPU RAS Support +==================== + +The AMDGPU RAS interfaces are exposed via sysfs (for informational queries) and +debugfs (for error injection). + +RAS debugfs/sysfs Control and Error Injection Interfaces +======================================================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c + :doc: AMDGPU RAS debugfs control interface + +RAS Reboot Behavior for Unrecoverable Errors +============================================ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c + :doc: AMDGPU RAS Reboot Behavior for Unrecoverable Errors + +RAS Error Count sysfs Interface +=============================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c + :doc: AMDGPU RAS sysfs Error Count Interface + +RAS EEPROM debugfs Interface +============================ + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c + :doc: AMDGPU RAS debugfs EEPROM table reset interface + +RAS VRAM Bad Pages sysfs Interface +================================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c + :doc: AMDGPU RAS sysfs gpu_vram_bad_pages Interface + +Sample Code +=========== +Sample code for testing error injection can be found here: +https://cgit.freedesktop.org/mesa/drm/tree/tests/amdgpu/ras_tests.c + +This is part of the libdrm amdgpu unit tests which cover several areas of the GPU. +There are four sets of tests: + +RAS Basic Test + +The test verifies the RAS feature enabled status and makes sure the necessary sysfs and debugfs files +are present. + +RAS Query Test + +This test checks the RAS availability and enablement status for each supported IP block as well as +the error counts. + +RAS Inject Test + +This test injects errors for each IP. + +RAS Disable Test + +This test tests disabling of RAS features for each IP block. diff --git a/Documentation/gpu/amdgpu/thermal.rst b/Documentation/gpu/amdgpu/thermal.rst new file mode 100644 index 000000000000..5e27e4eb3959 --- /dev/null +++ b/Documentation/gpu/amdgpu/thermal.rst @@ -0,0 +1,122 @@ +=========================================== + GPU Power/Thermal Controls and Monitoring +=========================================== + +HWMON Interfaces +================ + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: hwmon + +GPU sysfs Power State Interfaces +================================ + +GPU power controls are exposed via sysfs files. + +power_dpm_state +--------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: power_dpm_state + +power_dpm_force_performance_level +--------------------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: power_dpm_force_performance_level + +pp_table +-------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: pp_table + +pp_od_clk_voltage +----------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: pp_od_clk_voltage + +pp_dpm_* +-------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk pp_dpm_pcie + +pp_power_profile_mode +--------------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: pp_power_profile_mode + +\*_busy_percent +--------------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: gpu_busy_percent + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: mem_busy_percent + +gpu_metrics +----------- + +.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c + :doc: gpu_metrics + +GFXOFF +====== + +GFXOFF is a feature found in most recent GPUs that saves power at runtime. The +card's RLC (RunList Controller) firmware powers off the gfx engine +dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by +default on supported GPUs. + +Userspace can interact with GFXOFF through a debugfs interface (all values in +`uint32_t`, unless otherwise noted): + +``amdgpu_gfxoff`` +----------------- + +Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled:: + + $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff + 01 + +- Write 0 to disable it, and 1 to enable it. +- Read 0 means it's disabled, 1 it's enabled. + +If it's enabled, that means that the GPU is free to enter into GFXOFF mode as +needed. Disabled means that it will never enter GFXOFF mode. + +``amdgpu_gfxoff_status`` +------------------------ + +Read it to check current GFXOFF's status of a GPU:: + + $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status + 02 + +- 0: GPU is in GFXOFF state, the gfx engine is powered down. +- 1: Transition out of GFXOFF state +- 2: Not in GFXOFF state +- 3: Transition into GFXOFF state + +If GFXOFF is enabled, the value will be transitioning around [0, 3], always +getting into 0 when possible. When it's disabled, it's always at 2. Returns +``-EINVAL`` if it's not supported. + +``amdgpu_gfxoff_count`` +----------------------- + +Read it to get the total GFXOFF entry count at the time of query since system +power-up. The value is an `uint64_t` type, however, due to firmware limitations, +it can currently overflow as an `uint32_t`. *Only supported in vangogh* + +``amdgpu_gfxoff_residency`` +--------------------------- + +Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to +get average GFXOFF residency % multiplied by 100 during the last logging +interval. E.g. a value of 7854 means 78.54% of the time in the last logging +interval the GPU was in GFXOFF mode. *Only supported in vangogh* diff --git a/Documentation/gpu/amdgpu/xgmi.rst b/Documentation/gpu/amdgpu/xgmi.rst new file mode 100644 index 000000000000..23f2856f4524 --- /dev/null +++ b/Documentation/gpu/amdgpu/xgmi.rst @@ -0,0 +1,5 @@ +===================== + AMDGPU XGMI Support +===================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c diff --git a/Documentation/gpu/drivers.rst b/Documentation/gpu/drivers.rst index b4a0ed3ca961..3a52f48215a3 100644 --- a/Documentation/gpu/drivers.rst +++ b/Documentation/gpu/drivers.rst @@ -4,8 +4,7 @@ GPU Driver Documentation .. toctree:: - amdgpu - amdgpu-dc + amdgpu/index i915 mcde meson diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst index 607f78f0f189..5fd20a306718 100644 --- a/Documentation/gpu/drm-internals.rst +++ b/Documentation/gpu/drm-internals.rst @@ -75,6 +75,12 @@ update it, its value is mostly useless. The DRM core prints it to the kernel log at initialization time and passes it to userspace through the DRM_IOCTL_VERSION ioctl. +Module Initialization +--------------------- + +.. kernel-doc:: include/drm/drm_module.h + :doc: overview + Managing Ownership of the Framebuffer Aperture ---------------------------------------------- @@ -201,6 +207,38 @@ Utilities :internal: +Unit testing +============ + +KUnit +----- + +KUnit (Kernel unit testing framework) provides a common framework for unit tests +within the Linux kernel. + +This section covers the specifics for the DRM subsystem. For general information +about KUnit, please refer to Documentation/dev-tools/kunit/start.rst. + +How to run the tests? +~~~~~~~~~~~~~~~~~~~~~ + +In order to facilitate running the test suite, a configuration file is present +in ``drivers/gpu/drm/tests/.kunitconfig``. It can be used by ``kunit.py`` as +follows: + +.. code-block:: bash + + $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/tests \ + --kconfig_add CONFIG_VIRTIO_UML=y \ + --kconfig_add CONFIG_UML_PCI_OVER_VIRTIO=y + +.. note:: + The configuration included in ``.kunitconfig`` should be as generic as + possible. + ``CONFIG_VIRTIO_UML`` and ``CONFIG_UML_PCI_OVER_VIRTIO`` are not + included in it because they are only required for User Mode Linux. + + Legacy Support Code =================== diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst index ec2f65b31930..dbc85fd7a971 100644 --- a/Documentation/gpu/drm-kms-helpers.rst +++ b/Documentation/gpu/drm-kms-helpers.rst @@ -122,13 +122,13 @@ format Helper Functions Reference .. kernel-doc:: drivers/gpu/drm/drm_format_helper.c :export: -Framebuffer CMA Helper Functions Reference +Framebuffer DMA Helper Functions Reference ========================================== -.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c - :doc: framebuffer cma helper functions +.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c + :doc: framebuffer dma helper functions -.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c +.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c :export: Framebuffer GEM Helper Reference @@ -226,40 +226,43 @@ Panel Self Refresh Helper Reference HDCP Helper Functions Reference =============================== -.. kernel-doc:: drivers/gpu/drm/drm_hdcp.c +.. kernel-doc:: drivers/gpu/drm/display/drm_hdcp_helper.c :export: Display Port Helper Functions Reference ======================================= -.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c :doc: dp helpers -.. kernel-doc:: include/drm/drm_dp_helper.h +.. kernel-doc:: include/drm/display/drm_dp.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c +.. kernel-doc:: include/drm/display/drm_dp_helper.h + :internal: + +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c :export: Display Port CEC Helper Functions Reference =========================================== -.. kernel-doc:: drivers/gpu/drm/drm_dp_cec.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c :doc: dp cec helpers -.. kernel-doc:: drivers/gpu/drm/drm_dp_cec.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c :export: Display Port Dual Mode Adaptor Helper Functions Reference ========================================================= -.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c :doc: dp dual mode helpers -.. kernel-doc:: include/drm/drm_dp_dual_mode_helper.h +.. kernel-doc:: include/drm/display/drm_dp_dual_mode_helper.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c :export: Display Port MST Helpers @@ -268,19 +271,19 @@ Display Port MST Helpers Overview -------- -.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c :doc: dp mst helper -.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c :doc: Branch device and port refcounting Functions Reference ------------------- -.. kernel-doc:: include/drm/drm_dp_mst_helper.h +.. kernel-doc:: include/drm/display/drm_dp_mst_helper.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c :export: Topology Lifetime Internals @@ -289,7 +292,7 @@ Topology Lifetime Internals These functions aren't exported to drivers, but are documented here to help make the MST topology helpers easier to understand -.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c :functions: drm_dp_mst_topology_try_get_mstb drm_dp_mst_topology_get_mstb drm_dp_mst_topology_put_mstb drm_dp_mst_topology_try_get_port drm_dp_mst_topology_get_port @@ -323,13 +326,13 @@ MIPI DSI Helper Functions Reference Display Stream Compression Helper Functions Reference ===================================================== -.. kernel-doc:: drivers/gpu/drm/drm_dsc.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c :doc: dsc helpers -.. kernel-doc:: include/drm/drm_dsc.h +.. kernel-doc:: include/drm/display/drm_dsc.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_dsc.c +.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c :export: Output Probing Helper Functions Reference @@ -353,13 +356,13 @@ EDID Helper Functions Reference SCDC Helper Functions Reference =============================== -.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c +.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c :doc: scdc helpers -.. kernel-doc:: include/drm/drm_scdc_helper.h +.. kernel-doc:: include/drm/display/drm_scdc_helper.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c +.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c :export: HDMI Infoframes Helper Reference @@ -435,3 +438,18 @@ Legacy CRTC/Modeset Helper Functions Reference .. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c :export: + +Privacy-screen class +==================== + +.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c + :doc: overview + +.. kernel-doc:: include/drm/drm_privacy_screen_driver.h + :internal: + +.. kernel-doc:: include/drm/drm_privacy_screen_machine.h + :internal: + +.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c + :export: diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1ef7951ded5e..b4377a545425 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -423,12 +423,12 @@ Connector Functions Reference Writeback Connectors -------------------- -.. kernel-doc:: include/drm/drm_writeback.h - :internal: - .. kernel-doc:: drivers/gpu/drm/drm_writeback.c :doc: overview +.. kernel-doc:: include/drm/drm_writeback.h + :internal: + .. kernel-doc:: drivers/gpu/drm/drm_writeback.c :export: @@ -506,6 +506,8 @@ Property Types and Blob Property Support .. kernel-doc:: drivers/gpu/drm/drm_property.c :export: +.. _standard_connector_properties: + Standard Connector Properties ----------------------------- @@ -530,6 +532,8 @@ Standard Plane Properties .. kernel-doc:: drivers/gpu/drm/drm_plane.c :doc: standard plane properties +.. _plane_composition_properties: + Plane Composition Properties ---------------------------- diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst index e0538083a2c0..a79fd3549ff8 100644 --- a/Documentation/gpu/drm-mm.rst +++ b/Documentation/gpu/drm-mm.rst @@ -8,7 +8,7 @@ the very dynamic nature of many of that data, managing graphics memory efficiently is thus crucial for the graphics stack and plays a central role in the DRM infrastructure. -The DRM core includes two memory managers, namely Translation Table Maps +The DRM core includes two memory managers, namely Translation Table Manager (TTM) and Graphics Execution Manager (GEM). TTM was the first DRM memory manager to be developed and tried to be a one-size-fits-them all solution. It provides a single userspace API to accommodate the need of @@ -300,12 +300,12 @@ Drivers that want to map the GEM object upfront instead of handling page faults can implement their own mmap file operation handler. For platforms without MMU the GEM core provides a helper method -drm_gem_cma_get_unmapped_area(). The mmap() routines will call this to get a +drm_gem_dma_get_unmapped_area(). The mmap() routines will call this to get a proposed address for the mapping. -To use drm_gem_cma_get_unmapped_area(), drivers must fill the struct +To use drm_gem_dma_get_unmapped_area(), drivers must fill the struct :c:type:`struct file_operations <file_operations>` get_unmapped_area field with -a pointer on drm_gem_cma_get_unmapped_area(). +a pointer on drm_gem_dma_get_unmapped_area(). More detailed information about get_unmapped_area can be found in Documentation/admin-guide/mm/nommu-mmap.rst @@ -355,16 +355,16 @@ GEM Function Reference .. kernel-doc:: drivers/gpu/drm/drm_gem.c :export: -GEM CMA Helper Functions Reference +GEM DMA Helper Functions Reference ---------------------------------- -.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c - :doc: cma helpers +.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c + :doc: dma helpers -.. kernel-doc:: include/drm/drm_gem_cma_helper.h +.. kernel-doc:: include/drm/drm_gem_dma_helper.h :internal: -.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c +.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c :export: GEM SHMEM Helper Function Reference @@ -466,6 +466,15 @@ DRM MM Range Allocator Function References .. kernel-doc:: drivers/gpu/drm/drm_mm.c :export: +DRM Buddy Allocator +=================== + +DRM Buddy Function References +----------------------------- + +.. kernel-doc:: drivers/gpu/drm/drm_buddy.c + :export: + DRM Cache Handling and Fast WC memcpy() ======================================= diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst index 199afb503ab1..ce47b4292481 100644 --- a/Documentation/gpu/drm-uapi.rst +++ b/Documentation/gpu/drm-uapi.rst @@ -148,7 +148,9 @@ clients together with the legacy drmAuth authentication procedure. If a driver advertises render node support, DRM core will create a separate render node called renderD<num>. There will be one render node per device. No ioctls except PRIME-related ioctls will be allowed on -this node. Especially GEM_OPEN will be explicitly prohibited. Render +this node. Especially GEM_OPEN will be explicitly prohibited. For a +complete list of driver-independent ioctls that can be used on render +nodes, see the ioctls marked DRM_RENDER_ALLOW in drm_ioctl.c Render nodes are designed to avoid the buffer-leaks, which occur if clients guess the flink names or mmap offsets on the legacy interface. Additionally to this basic interface, drivers must mark their diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst new file mode 100644 index 000000000000..92c5117368d7 --- /dev/null +++ b/Documentation/gpu/drm-usage-stats.rst @@ -0,0 +1,133 @@ +.. _drm-client-usage-stats: + +====================== +DRM client usage stats +====================== + +DRM drivers can choose to export partly standardised text output via the +`fops->show_fdinfo()` as part of the driver specific file operations registered +in the `struct drm_driver` object registered with the DRM core. + +One purpose of this output is to enable writing as generic as practicaly +feasible `top(1)` like userspace monitoring tools. + +Given the differences between various DRM drivers the specification of the +output is split between common and driver specific parts. Having said that, +wherever possible effort should still be made to standardise as much as +possible. + +File format specification +========================= + +- File shall contain one key value pair per one line of text. +- Colon character (`:`) must be used to delimit keys and values. +- All keys shall be prefixed with `drm-`. +- Whitespace between the delimiter and first non-whitespace character shall be + ignored when parsing. +- Neither keys or values are allowed to contain whitespace characters. +- Numerical key value pairs can end with optional unit string. +- Data type of the value is fixed as defined in the specification. + +Key types +--------- + +1. Mandatory, fully standardised. +2. Optional, fully standardised. +3. Driver specific. + +Data types +---------- + +- <uint> - Unsigned integer without defining the maximum value. +- <str> - String excluding any above defined reserved characters or whitespace. + +Mandatory fully standardised keys +--------------------------------- + +- drm-driver: <str> + +String shall contain the name this driver registered as via the respective +`struct drm_driver` data structure. + +Optional fully standardised keys +-------------------------------- + +- drm-pdev: <aaaa:bb.cc.d> + +For PCI devices this should contain the PCI slot address of the device in +question. + +- drm-client-id: <uint> + +Unique value relating to the open DRM file descriptor used to distinguish +duplicated and shared file descriptors. Conceptually the value should map 1:1 +to the in kernel representation of `struct drm_file` instances. + +Uniqueness of the value shall be either globally unique, or unique within the +scope of each device, in which case `drm-pdev` shall be present as well. + +Userspace should make sure to not double account any usage statistics by using +the above described criteria in order to associate data to individual clients. + +- drm-engine-<str>: <uint> ns + +GPUs usually contain multiple execution engines. Each shall be given a stable +and unique name (str), with possible values documented in the driver specific +documentation. + +Value shall be in specified time units which the respective GPU engine spent +busy executing workloads belonging to this client. + +Values are not required to be constantly monotonic if it makes the driver +implementation easier, but are required to catch up with the previously reported +larger value within a reasonable period. Upon observing a value lower than what +was previously read, userspace is expected to stay with that larger previous +value until a monotonic update is seen. + +- drm-engine-capacity-<str>: <uint> + +Engine identifier string must be the same as the one specified in the +drm-engine-<str> tag and shall contain a greater than zero number in case the +exported engine corresponds to a group of identical hardware engines. + +In the absence of this tag parser shall assume capacity of one. Zero capacity +is not allowed. + +- drm-memory-<str>: <uint> [KiB|MiB] + +Each possible memory type which can be used to store buffer objects by the +GPU in question shall be given a stable and unique name to be returned as the +string here. + +Value shall reflect the amount of storage currently consumed by the buffer +object belong to this client, in the respective memory region. + +Default unit shall be bytes with optional unit specifiers of 'KiB' or 'MiB' +indicating kibi- or mebi-bytes. + +- drm-cycles-<str> <uint> + +Engine identifier string must be the same as the one specified in the +drm-engine-<str> tag and shall contain the number of busy cycles for the given +engine. + +Values are not required to be constantly monotonic if it makes the driver +implementation easier, but are required to catch up with the previously reported +larger value within a reasonable period. Upon observing a value lower than what +was previously read, userspace is expected to stay with that larger previous +value until a monotonic update is seen. + +- drm-maxfreq-<str> <uint> [Hz|MHz|KHz] + +Engine identifier string must be the same as the one specified in the +drm-engine-<str> tag and shall contain the maximum frequency for the given +engine. Taken together with drm-cycles-<str>, this can be used to calculate +percentage utilization of the engine, whereas drm-engine-<str> only reflects +time active without considering what frequency the engine is operating as a +percentage of it's maximum frequency. + +=============================== +Driver specific implementations +=============================== + +:ref:`i915-usage-stats` diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst index b7d801993bfa..4e59db1cfb00 100644 --- a/Documentation/gpu/i915.rst +++ b/Documentation/gpu/i915.rst @@ -187,19 +187,7 @@ Display Refresh Rate Switching (DRRS) :doc: Display Refresh Rate Switching (DRRS) .. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c - :functions: intel_drrs_enable - -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c - :functions: intel_drrs_disable - -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c - :functions: intel_drrs_invalidate - -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c - :functions: intel_drrs_flush - -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c - :functions: intel_drrs_init + :internal: DPIO ---- @@ -258,6 +246,18 @@ Display State Buffer .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c :internal: +GT Programming +============== + +Multicast/Replicated (MCR) Registers +------------------------------------ + +.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c + :doc: GT Multicast/Replicated (MCR) Register Support + +.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c + :internal: + Memory Management and Command Submission ======================================== @@ -539,6 +539,7 @@ GuC ABI .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_communication_mmio_abi.h .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h +.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h HuC --- @@ -708,3 +709,31 @@ The style guide for ``i915_reg.h``. .. kernel-doc:: drivers/gpu/drm/i915/i915_reg.h :doc: The i915 register macro definition style guide + +.. _i915-usage-stats: + +i915 DRM client usage stats implementation +========================================== + +The drm/i915 driver implements the DRM client usage stats specification as +documented in :ref:`drm-client-usage-stats`. + +Example of the output showing the implemented key value pairs and entirety of +the currently possible format options: + +:: + + pos: 0 + flags: 0100002 + mnt_id: 21 + drm-driver: i915 + drm-pdev: 0000:00:02.0 + drm-client-id: 7 + drm-engine-render: 9288864723 ns + drm-engine-copy: 2035071108 ns + drm-engine-video: 0 ns + drm-engine-capacity-video: 2 + drm-engine-video-enhance: 0 ns + +Possible `drm-engine-` key names are: `render`, `copy`, `video` and +`video-enhance`. diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst index b9c1214d8f23..b99dede9a5b1 100644 --- a/Documentation/gpu/index.rst +++ b/Documentation/gpu/index.rst @@ -10,6 +10,7 @@ Linux GPU Driver Developer's Guide drm-kms drm-kms-helpers drm-uapi + drm-usage-stats driver-uapi drm-client drivers diff --git a/Documentation/gpu/introduction.rst b/Documentation/gpu/introduction.rst index 25a56e9c0cfd..f05eccd2c07c 100644 --- a/Documentation/gpu/introduction.rst +++ b/Documentation/gpu/introduction.rst @@ -112,3 +112,63 @@ Please conduct yourself in a respectful and civilised manner when interacting with community members on mailing lists, IRC, or bug trackers. The community represents the project as a whole, and abusive or bullying behaviour is not tolerated by the project. + +Simple DRM drivers to use as examples +===================================== + +The DRM subsystem contains a lot of helper functions to ease writing drivers for +simple graphic devices. For example, the `drivers/gpu/drm/tiny/` directory has a +set of drivers that are simple enough to be implemented in a single source file. + +These drivers make use of the `struct drm_simple_display_pipe_funcs`, that hides +any complexity of the DRM subsystem and just requires drivers to implement a few +functions needed to operate the device. This could be used for devices that just +need a display pipeline with one full-screen scanout buffer feeding one output. + +The tiny DRM drivers are good examples to understand how DRM drivers should look +like. Since are just a few hundreds lines of code, they are quite easy to read. + +External References +=================== + +Delving into a Linux kernel subsystem for the first time can be an overwhelming +experience, one needs to get familiar with all the concepts and learn about the +subsystem's internals, among other details. + +To shallow the learning curve, this section contains a list of presentations +and documents that can be used to learn about DRM/KMS and graphics in general. + +There are different reasons why someone might want to get into DRM: porting an +existing fbdev driver, write a DRM driver for a new hardware, fixing bugs that +could face when working on the graphics user-space stack, etc. For this reason, +the learning material covers many aspects of the Linux graphics stack. From an +overview of the kernel and user-space stacks to very specific topics. + +The list is sorted in reverse chronological order, to keep the most up-to-date +material at the top. But all of them contain useful information, and it can be +valuable to go through older material to understand the rationale and context +in which the changes to the DRM subsystem were made. + +Conference talks +---------------- + +* `An Overview of the Linux and Userspace Graphics Stack <https://www.youtube.com/watch?v=wjAJmqwg47k>`_ - Paul Kocialkowski (2020) +* `Getting pixels on screen on Linux: introduction to Kernel Mode Setting <https://www.youtube.com/watch?v=haes4_Xnc5Q>`_ - Simon Ser (2020) +* `Everything Great about Upstream Graphics <https://www.youtube.com/watch?v=kVzHOgt6WGE>`_ - Daniel Vetter (2019) +* `An introduction to the Linux DRM subsystem <https://www.youtube.com/watch?v=LbDOCJcDRoo>`_ - Maxime Ripard (2017) +* `Embrace the Atomic (Display) Age <https://www.youtube.com/watch?v=LjiB_JeDn2M>`_ - Daniel Vetter (2016) +* `Anatomy of an Atomic KMS Driver <https://www.youtube.com/watch?v=lihqR9sENpc>`_ - Laurent Pinchart (2015) +* `Atomic Modesetting for Drivers <https://www.youtube.com/watch?v=kl9suFgbTc8>`_ - Daniel Vetter (2015) +* `Anatomy of an Embedded KMS Driver <https://www.youtube.com/watch?v=Ja8fM7rTae4>`_ - Laurent Pinchart (2013) + +Slides and articles +------------------- + +* `Understanding the Linux Graphics Stack <https://bootlin.com/doc/training/graphics/graphics-slides.pdf>`_ - Bootlin (2022) +* `DRM KMS overview <https://wiki.st.com/stm32mpu/wiki/DRM_KMS_overview>`_ - STMicroelectronics (2021) +* `Linux graphic stack <https://studiopixl.com/2017-05-13/linux-graphic-stack-an-overview>`_ - Nathan Gauër (2017) +* `Atomic mode setting design overview, part 1 <https://lwn.net/Articles/653071/>`_ - Daniel Vetter (2015) +* `Atomic mode setting design overview, part 2 <https://lwn.net/Articles/653466/>`_ - Daniel Vetter (2015) +* `The DRM/KMS subsystem from a newbie’s point of view <https://bootlin.com/pub/conferences/2014/elce/brezillon-drm-kms/brezillon-drm-kms.pdf>`_ - Boris Brezillon (2014) +* `A brief introduction to the Linux graphics stack <https://blogs.igalia.com/itoral/2014/07/29/a-brief-introduction-to-the-linux-graphics-stack/>`_ - Iago Toral (2014) +* `The Linux Graphics Stack <https://blog.mecheye.net/2012/06/the-linux-graphics-stack/>`_ - Jasper St. Pierre (2012) diff --git a/Documentation/gpu/rfc/i915_small_bar.h b/Documentation/gpu/rfc/i915_small_bar.h new file mode 100644 index 000000000000..6003c81d5aa4 --- /dev/null +++ b/Documentation/gpu/rfc/i915_small_bar.h @@ -0,0 +1,189 @@ +/** + * struct __drm_i915_memory_region_info - Describes one region as known to the + * driver. + * + * Note this is using both struct drm_i915_query_item and struct drm_i915_query. + * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS + * at &drm_i915_query_item.query_id. + */ +struct __drm_i915_memory_region_info { + /** @region: The class:instance pair encoding */ + struct drm_i915_gem_memory_class_instance region; + + /** @rsvd0: MBZ */ + __u32 rsvd0; + + /** + * @probed_size: Memory probed by the driver + * + * Note that it should not be possible to ever encounter a zero value + * here, also note that no current region type will ever return -1 here. + * Although for future region types, this might be a possibility. The + * same applies to the other size fields. + */ + __u64 probed_size; + + /** + * @unallocated_size: Estimate of memory remaining + * + * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting. + * Without this (or if this is an older kernel) the value here will + * always equal the @probed_size. Note this is only currently tracked + * for I915_MEMORY_CLASS_DEVICE regions (for other types the value here + * will always equal the @probed_size). + */ + __u64 unallocated_size; + + union { + /** @rsvd1: MBZ */ + __u64 rsvd1[8]; + struct { + /** + * @probed_cpu_visible_size: Memory probed by the driver + * that is CPU accessible. + * + * This will be always be <= @probed_size, and the + * remainder (if there is any) will not be CPU + * accessible. + * + * On systems without small BAR, the @probed_size will + * always equal the @probed_cpu_visible_size, since all + * of it will be CPU accessible. + * + * Note this is only tracked for + * I915_MEMORY_CLASS_DEVICE regions (for other types the + * value here will always equal the @probed_size). + * + * Note that if the value returned here is zero, then + * this must be an old kernel which lacks the relevant + * small-bar uAPI support (including + * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS), but on + * such systems we should never actually end up with a + * small BAR configuration, assuming we are able to load + * the kernel module. Hence it should be safe to treat + * this the same as when @probed_cpu_visible_size == + * @probed_size. + */ + __u64 probed_cpu_visible_size; + + /** + * @unallocated_cpu_visible_size: Estimate of CPU + * visible memory remaining + * + * Note this is only tracked for + * I915_MEMORY_CLASS_DEVICE regions (for other types the + * value here will always equal the + * @probed_cpu_visible_size). + * + * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable + * accounting. Without this the value here will always + * equal the @probed_cpu_visible_size. Note this is only + * currently tracked for I915_MEMORY_CLASS_DEVICE + * regions (for other types the value here will also + * always equal the @probed_cpu_visible_size). + * + * If this is an older kernel the value here will be + * zero, see also @probed_cpu_visible_size. + */ + __u64 unallocated_cpu_visible_size; + }; + }; +}; + +/** + * struct __drm_i915_gem_create_ext - Existing gem_create behaviour, with added + * extension support using struct i915_user_extension. + * + * Note that new buffer flags should be added here, at least for the stuff that + * is immutable. Previously we would have two ioctls, one to create the object + * with gem_create, and another to apply various parameters, however this + * creates some ambiguity for the params which are considered immutable. Also in + * general we're phasing out the various SET/GET ioctls. + */ +struct __drm_i915_gem_create_ext { + /** + * @size: Requested size for the object. + * + * The (page-aligned) allocated size for the object will be returned. + * + * Note that for some devices we have might have further minimum + * page-size restrictions (larger than 4K), like for device local-memory. + * However in general the final size here should always reflect any + * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS + * extension to place the object in device local-memory. The kernel will + * always select the largest minimum page-size for the set of possible + * placements as the value to use when rounding up the @size. + */ + __u64 size; + + /** + * @handle: Returned handle for the object. + * + * Object handles are nonzero. + */ + __u32 handle; + + /** + * @flags: Optional flags. + * + * Supported values: + * + * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS - Signal to the kernel that + * the object will need to be accessed via the CPU. + * + * Only valid when placing objects in I915_MEMORY_CLASS_DEVICE, and only + * strictly required on configurations where some subset of the device + * memory is directly visible/mappable through the CPU (which we also + * call small BAR), like on some DG2+ systems. Note that this is quite + * undesirable, but due to various factors like the client CPU, BIOS etc + * it's something we can expect to see in the wild. See + * &__drm_i915_memory_region_info.probed_cpu_visible_size for how to + * determine if this system applies. + * + * Note that one of the placements MUST be I915_MEMORY_CLASS_SYSTEM, to + * ensure the kernel can always spill the allocation to system memory, + * if the object can't be allocated in the mappable part of + * I915_MEMORY_CLASS_DEVICE. + * + * Also note that since the kernel only supports flat-CCS on objects + * that can *only* be placed in I915_MEMORY_CLASS_DEVICE, we therefore + * don't support I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS together with + * flat-CCS. + * + * Without this hint, the kernel will assume that non-mappable + * I915_MEMORY_CLASS_DEVICE is preferred for this object. Note that the + * kernel can still migrate the object to the mappable part, as a last + * resort, if userspace ever CPU faults this object, but this might be + * expensive, and so ideally should be avoided. + * + * On older kernels which lack the relevant small-bar uAPI support (see + * also &__drm_i915_memory_region_info.probed_cpu_visible_size), + * usage of the flag will result in an error, but it should NEVER be + * possible to end up with a small BAR configuration, assuming we can + * also successfully load the i915 kernel module. In such cases the + * entire I915_MEMORY_CLASS_DEVICE region will be CPU accessible, and as + * such there are zero restrictions on where the object can be placed. + */ +#define I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS (1 << 0) + __u32 flags; + + /** + * @extensions: The chain of extensions to apply to this object. + * + * This will be useful in the future when we need to support several + * different extensions, and we need to apply more than one when + * creating the object. See struct i915_user_extension. + * + * If we don't supply any extensions then we get the same old gem_create + * behaviour. + * + * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see + * struct drm_i915_gem_create_ext_memory_regions. + * + * For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see + * struct drm_i915_gem_create_ext_protected_content. + */ +#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0 +#define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1 + __u64 extensions; +}; diff --git a/Documentation/gpu/rfc/i915_small_bar.rst b/Documentation/gpu/rfc/i915_small_bar.rst new file mode 100644 index 000000000000..d6c03ce3b862 --- /dev/null +++ b/Documentation/gpu/rfc/i915_small_bar.rst @@ -0,0 +1,47 @@ +========================== +I915 Small BAR RFC Section +========================== +Starting from DG2 we will have resizable BAR support for device local-memory(i.e +I915_MEMORY_CLASS_DEVICE), but in some cases the final BAR size might still be +smaller than the total probed_size. In such cases, only some subset of +I915_MEMORY_CLASS_DEVICE will be CPU accessible(for example the first 256M), +while the remainder is only accessible via the GPU. + +I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS flag +---------------------------------------------- +New gem_create_ext flag to tell the kernel that a BO will require CPU access. +This becomes important when placing an object in I915_MEMORY_CLASS_DEVICE, where +underneath the device has a small BAR, meaning only some portion of it is CPU +accessible. Without this flag the kernel will assume that CPU access is not +required, and prioritize using the non-CPU visible portion of +I915_MEMORY_CLASS_DEVICE. + +.. kernel-doc:: Documentation/gpu/rfc/i915_small_bar.h + :functions: __drm_i915_gem_create_ext + +probed_cpu_visible_size attribute +--------------------------------- +New struct__drm_i915_memory_region attribute which returns the total size of the +CPU accessible portion, for the particular region. This should only be +applicable for I915_MEMORY_CLASS_DEVICE. We also report the +unallocated_cpu_visible_size, alongside the unallocated_size. + +Vulkan will need this as part of creating a separate VkMemoryHeap with the +VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT set, to represent the CPU visible portion, +where the total size of the heap needs to be known. It also wants to be able to +give a rough estimate of how memory can potentially be allocated. + +.. kernel-doc:: Documentation/gpu/rfc/i915_small_bar.h + :functions: __drm_i915_memory_region_info + +Error Capture restrictions +-------------------------- +With error capture we have two new restrictions: + + 1) Error capture is best effort on small BAR systems; if the pages are not + CPU accessible, at the time of capture, then the kernel is free to skip + trying to capture them. + + 2) On discrete and newer integrated platforms we now reject error capture + on recoverable contexts. In the future the kernel may want to blit during + error capture, when for example something is not currently CPU accessible. diff --git a/Documentation/gpu/rfc/i915_vm_bind.h b/Documentation/gpu/rfc/i915_vm_bind.h new file mode 100644 index 000000000000..8a8fcd4fceac --- /dev/null +++ b/Documentation/gpu/rfc/i915_vm_bind.h @@ -0,0 +1,291 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2022 Intel Corporation + */ + +/** + * DOC: I915_PARAM_VM_BIND_VERSION + * + * VM_BIND feature version supported. + * See typedef drm_i915_getparam_t param. + * + * Specifies the VM_BIND feature version supported. + * The following versions of VM_BIND have been defined: + * + * 0: No VM_BIND support. + * + * 1: In VM_UNBIND calls, the UMD must specify the exact mappings created + * previously with VM_BIND, the ioctl will not support unbinding multiple + * mappings or splitting them. Similarly, VM_BIND calls will not replace + * any existing mappings. + * + * 2: The restrictions on unbinding partial or multiple mappings is + * lifted, Similarly, binding will replace any mappings in the given range. + * + * See struct drm_i915_gem_vm_bind and struct drm_i915_gem_vm_unbind. + */ +#define I915_PARAM_VM_BIND_VERSION 57 + +/** + * DOC: I915_VM_CREATE_FLAGS_USE_VM_BIND + * + * Flag to opt-in for VM_BIND mode of binding during VM creation. + * See struct drm_i915_gem_vm_control flags. + * + * The older execbuf2 ioctl will not support VM_BIND mode of operation. + * For VM_BIND mode, we have new execbuf3 ioctl which will not accept any + * execlist (See struct drm_i915_gem_execbuffer3 for more details). + */ +#define I915_VM_CREATE_FLAGS_USE_VM_BIND (1 << 0) + +/* VM_BIND related ioctls */ +#define DRM_I915_GEM_VM_BIND 0x3d +#define DRM_I915_GEM_VM_UNBIND 0x3e +#define DRM_I915_GEM_EXECBUFFER3 0x3f + +#define DRM_IOCTL_I915_GEM_VM_BIND DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_BIND, struct drm_i915_gem_vm_bind) +#define DRM_IOCTL_I915_GEM_VM_UNBIND DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_UNBIND, struct drm_i915_gem_vm_bind) +#define DRM_IOCTL_I915_GEM_EXECBUFFER3 DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER3, struct drm_i915_gem_execbuffer3) + +/** + * struct drm_i915_gem_timeline_fence - An input or output timeline fence. + * + * The operation will wait for input fence to signal. + * + * The returned output fence will be signaled after the completion of the + * operation. + */ +struct drm_i915_gem_timeline_fence { + /** @handle: User's handle for a drm_syncobj to wait on or signal. */ + __u32 handle; + + /** + * @flags: Supported flags are: + * + * I915_TIMELINE_FENCE_WAIT: + * Wait for the input fence before the operation. + * + * I915_TIMELINE_FENCE_SIGNAL: + * Return operation completion fence as output. + */ + __u32 flags; +#define I915_TIMELINE_FENCE_WAIT (1 << 0) +#define I915_TIMELINE_FENCE_SIGNAL (1 << 1) +#define __I915_TIMELINE_FENCE_UNKNOWN_FLAGS (-(I915_TIMELINE_FENCE_SIGNAL << 1)) + + /** + * @value: A point in the timeline. + * Value must be 0 for a binary drm_syncobj. A Value of 0 for a + * timeline drm_syncobj is invalid as it turns a drm_syncobj into a + * binary one. + */ + __u64 value; +}; + +/** + * struct drm_i915_gem_vm_bind - VA to object mapping to bind. + * + * This structure is passed to VM_BIND ioctl and specifies the mapping of GPU + * virtual address (VA) range to the section of an object that should be bound + * in the device page table of the specified address space (VM). + * The VA range specified must be unique (ie., not currently bound) and can + * be mapped to whole object or a section of the object (partial binding). + * Multiple VA mappings can be created to the same section of the object + * (aliasing). + * + * The @start, @offset and @length must be 4K page aligned. However the DG2 + * and XEHPSDV has 64K page size for device local memory and has compact page + * table. On those platforms, for binding device local-memory objects, the + * @start, @offset and @length must be 64K aligned. Also, UMDs should not mix + * the local memory 64K page and the system memory 4K page bindings in the same + * 2M range. + * + * Error code -EINVAL will be returned if @start, @offset and @length are not + * properly aligned. In version 1 (See I915_PARAM_VM_BIND_VERSION), error code + * -ENOSPC will be returned if the VA range specified can't be reserved. + * + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently + * are not ordered. Furthermore, parts of the VM_BIND operation can be done + * asynchronously, if valid @fence is specified. + */ +struct drm_i915_gem_vm_bind { + /** @vm_id: VM (address space) id to bind */ + __u32 vm_id; + + /** @handle: Object handle */ + __u32 handle; + + /** @start: Virtual Address start to bind */ + __u64 start; + + /** @offset: Offset in object to bind */ + __u64 offset; + + /** @length: Length of mapping to bind */ + __u64 length; + + /** + * @flags: Supported flags are: + * + * I915_GEM_VM_BIND_CAPTURE: + * Capture this mapping in the dump upon GPU error. + * + * Note that @fence carries its own flags. + */ + __u64 flags; +#define I915_GEM_VM_BIND_CAPTURE (1 << 0) + + /** + * @fence: Timeline fence for bind completion signaling. + * + * Timeline fence is of format struct drm_i915_gem_timeline_fence. + * + * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag + * is invalid, and an error will be returned. + * + * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence + * is not requested and binding is completed synchronously. + */ + struct drm_i915_gem_timeline_fence fence; + + /** + * @extensions: Zero-terminated chain of extensions. + * + * For future extensions. See struct i915_user_extension. + */ + __u64 extensions; +}; + +/** + * struct drm_i915_gem_vm_unbind - VA to object mapping to unbind. + * + * This structure is passed to VM_UNBIND ioctl and specifies the GPU virtual + * address (VA) range that should be unbound from the device page table of the + * specified address space (VM). VM_UNBIND will force unbind the specified + * range from device page table without waiting for any GPU job to complete. + * It is UMDs responsibility to ensure the mapping is no longer in use before + * calling VM_UNBIND. + * + * If the specified mapping is not found, the ioctl will simply return without + * any error. + * + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently + * are not ordered. Furthermore, parts of the VM_UNBIND operation can be done + * asynchronously, if valid @fence is specified. + */ +struct drm_i915_gem_vm_unbind { + /** @vm_id: VM (address space) id to bind */ + __u32 vm_id; + + /** @rsvd: Reserved, MBZ */ + __u32 rsvd; + + /** @start: Virtual Address start to unbind */ + __u64 start; + + /** @length: Length of mapping to unbind */ + __u64 length; + + /** + * @flags: Currently reserved, MBZ. + * + * Note that @fence carries its own flags. + */ + __u64 flags; + + /** + * @fence: Timeline fence for unbind completion signaling. + * + * Timeline fence is of format struct drm_i915_gem_timeline_fence. + * + * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag + * is invalid, and an error will be returned. + * + * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence + * is not requested and unbinding is completed synchronously. + */ + struct drm_i915_gem_timeline_fence fence; + + /** + * @extensions: Zero-terminated chain of extensions. + * + * For future extensions. See struct i915_user_extension. + */ + __u64 extensions; +}; + +/** + * struct drm_i915_gem_execbuffer3 - Structure for DRM_I915_GEM_EXECBUFFER3 + * ioctl. + * + * DRM_I915_GEM_EXECBUFFER3 ioctl only works in VM_BIND mode and VM_BIND mode + * only works with this ioctl for submission. + * See I915_VM_CREATE_FLAGS_USE_VM_BIND. + */ +struct drm_i915_gem_execbuffer3 { + /** + * @ctx_id: Context id + * + * Only contexts with user engine map are allowed. + */ + __u32 ctx_id; + + /** + * @engine_idx: Engine index + * + * An index in the user engine map of the context specified by @ctx_id. + */ + __u32 engine_idx; + + /** + * @batch_address: Batch gpu virtual address/es. + * + * For normal submission, it is the gpu virtual address of the batch + * buffer. For parallel submission, it is a pointer to an array of + * batch buffer gpu virtual addresses with array size equal to the + * number of (parallel) engines involved in that submission (See + * struct i915_context_engines_parallel_submit). + */ + __u64 batch_address; + + /** @flags: Currently reserved, MBZ */ + __u64 flags; + + /** @rsvd1: Reserved, MBZ */ + __u32 rsvd1; + + /** @fence_count: Number of fences in @timeline_fences array. */ + __u32 fence_count; + + /** + * @timeline_fences: Pointer to an array of timeline fences. + * + * Timeline fences are of format struct drm_i915_gem_timeline_fence. + */ + __u64 timeline_fences; + + /** @rsvd2: Reserved, MBZ */ + __u64 rsvd2; + + /** + * @extensions: Zero-terminated chain of extensions. + * + * For future extensions. See struct i915_user_extension. + */ + __u64 extensions; +}; + +/** + * struct drm_i915_gem_create_ext_vm_private - Extension to make the object + * private to the specified VM. + * + * See struct drm_i915_gem_create_ext. + */ +struct drm_i915_gem_create_ext_vm_private { +#define I915_GEM_CREATE_EXT_VM_PRIVATE 2 + /** @base: Extension link. See struct i915_user_extension. */ + struct i915_user_extension base; + + /** @vm_id: Id of the VM to which the object is private */ + __u32 vm_id; +}; diff --git a/Documentation/gpu/rfc/i915_vm_bind.rst b/Documentation/gpu/rfc/i915_vm_bind.rst new file mode 100644 index 000000000000..9a1dcdf2799e --- /dev/null +++ b/Documentation/gpu/rfc/i915_vm_bind.rst @@ -0,0 +1,245 @@ +========================================== +I915 VM_BIND feature design and use cases +========================================== + +VM_BIND feature +================ +DRM_I915_GEM_VM_BIND/UNBIND ioctls allows UMD to bind/unbind GEM buffer +objects (BOs) or sections of a BOs at specified GPU virtual addresses on a +specified address space (VM). These mappings (also referred to as persistent +mappings) will be persistent across multiple GPU submissions (execbuf calls) +issued by the UMD, without user having to provide a list of all required +mappings during each submission (as required by older execbuf mode). + +The VM_BIND/UNBIND calls allow UMDs to request a timeline out fence for +signaling the completion of bind/unbind operation. + +VM_BIND feature is advertised to user via I915_PARAM_VM_BIND_VERSION. +User has to opt-in for VM_BIND mode of binding for an address space (VM) +during VM creation time via I915_VM_CREATE_FLAGS_USE_VM_BIND extension. + +VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently are +not ordered. Furthermore, parts of the VM_BIND/UNBIND operations can be done +asynchronously, when valid out fence is specified. + +VM_BIND features include: + +* Multiple Virtual Address (VA) mappings can map to the same physical pages + of an object (aliasing). +* VA mapping can map to a partial section of the BO (partial binding). +* Support capture of persistent mappings in the dump upon GPU error. +* Support for userptr gem objects (no special uapi is required for this). + +TLB flush consideration +------------------------ +The i915 driver flushes the TLB for each submission and when an object's +pages are released. The VM_BIND/UNBIND operation will not do any additional +TLB flush. Any VM_BIND mapping added will be in the working set for subsequent +submissions on that VM and will not be in the working set for currently running +batches (which would require additional TLB flushes, which is not supported). + +Execbuf ioctl in VM_BIND mode +------------------------------- +A VM in VM_BIND mode will not support older execbuf mode of binding. +The execbuf ioctl handling in VM_BIND mode differs significantly from the +older execbuf2 ioctl (See struct drm_i915_gem_execbuffer2). +Hence, a new execbuf3 ioctl has been added to support VM_BIND mode. (See +struct drm_i915_gem_execbuffer3). The execbuf3 ioctl will not accept any +execlist. Hence, no support for implicit sync. It is expected that the below +work will be able to support requirements of object dependency setting in all +use cases: + +"dma-buf: Add an API for exporting sync files" +(https://lwn.net/Articles/859290/) + +The new execbuf3 ioctl only works in VM_BIND mode and the VM_BIND mode only +works with execbuf3 ioctl for submission. All BOs mapped on that VM (through +VM_BIND call) at the time of execbuf3 call are deemed required for that +submission. + +The execbuf3 ioctl directly specifies the batch addresses instead of as +object handles as in execbuf2 ioctl. The execbuf3 ioctl will also not +support many of the older features like in/out/submit fences, fence array, +default gem context and many more (See struct drm_i915_gem_execbuffer3). + +In VM_BIND mode, VA allocation is completely managed by the user instead of +the i915 driver. Hence all VA assignment, eviction are not applicable in +VM_BIND mode. Also, for determining object activeness, VM_BIND mode will not +be using the i915_vma active reference tracking. It will instead use dma-resv +object for that (See `VM_BIND dma_resv usage`_). + +So, a lot of existing code supporting execbuf2 ioctl, like relocations, VA +evictions, vma lookup table, implicit sync, vma active reference tracking etc., +are not applicable for execbuf3 ioctl. Hence, all execbuf3 specific handling +should be in a separate file and only functionalities common to these ioctls +can be the shared code where possible. + +VM_PRIVATE objects +------------------- +By default, BOs can be mapped on multiple VMs and can also be dma-buf +exported. Hence these BOs are referred to as Shared BOs. +During each execbuf submission, the request fence must be added to the +dma-resv fence list of all shared BOs mapped on the VM. + +VM_BIND feature introduces an optimization where user can create BO which +is private to a specified VM via I915_GEM_CREATE_EXT_VM_PRIVATE flag during +BO creation. Unlike Shared BOs, these VM private BOs can only be mapped on +the VM they are private to and can't be dma-buf exported. +All private BOs of a VM share the dma-resv object. Hence during each execbuf +submission, they need only one dma-resv fence list updated. Thus, the fast +path (where required mappings are already bound) submission latency is O(1) +w.r.t the number of VM private BOs. + +VM_BIND locking hirarchy +------------------------- +The locking design here supports the older (execlist based) execbuf mode, the +newer VM_BIND mode, the VM_BIND mode with GPU page faults and possible future +system allocator support (See `Shared Virtual Memory (SVM) support`_). +The older execbuf mode and the newer VM_BIND mode without page faults manages +residency of backing storage using dma_fence. The VM_BIND mode with page faults +and the system allocator support do not use any dma_fence at all. + +VM_BIND locking order is as below. + +1) Lock-A: A vm_bind mutex will protect vm_bind lists. This lock is taken in + vm_bind/vm_unbind ioctl calls, in the execbuf path and while releasing the + mapping. + + In future, when GPU page faults are supported, we can potentially use a + rwsem instead, so that multiple page fault handlers can take the read side + lock to lookup the mapping and hence can run in parallel. + The older execbuf mode of binding do not need this lock. + +2) Lock-B: The object's dma-resv lock will protect i915_vma state and needs to + be held while binding/unbinding a vma in the async worker and while updating + dma-resv fence list of an object. Note that private BOs of a VM will all + share a dma-resv object. + + The future system allocator support will use the HMM prescribed locking + instead. + +3) Lock-C: Spinlock/s to protect some of the VM's lists like the list of + invalidated vmas (due to eviction and userptr invalidation) etc. + +When GPU page faults are supported, the execbuf path do not take any of these +locks. There we will simply smash the new batch buffer address into the ring and +then tell the scheduler run that. The lock taking only happens from the page +fault handler, where we take lock-A in read mode, whichever lock-B we need to +find the backing storage (dma_resv lock for gem objects, and hmm/core mm for +system allocator) and some additional locks (lock-D) for taking care of page +table races. Page fault mode should not need to ever manipulate the vm lists, +so won't ever need lock-C. + +VM_BIND LRU handling +--------------------- +We need to ensure VM_BIND mapped objects are properly LRU tagged to avoid +performance degradation. We will also need support for bulk LRU movement of +VM_BIND objects to avoid additional latencies in execbuf path. + +The page table pages are similar to VM_BIND mapped objects (See +`Evictable page table allocations`_) and are maintained per VM and needs to +be pinned in memory when VM is made active (ie., upon an execbuf call with +that VM). So, bulk LRU movement of page table pages is also needed. + +VM_BIND dma_resv usage +----------------------- +Fences needs to be added to all VM_BIND mapped objects. During each execbuf +submission, they are added with DMA_RESV_USAGE_BOOKKEEP usage to prevent +over sync (See enum dma_resv_usage). One can override it with either +DMA_RESV_USAGE_READ or DMA_RESV_USAGE_WRITE usage during explicit object +dependency setting. + +Note that DRM_I915_GEM_WAIT and DRM_I915_GEM_BUSY ioctls do not check for +DMA_RESV_USAGE_BOOKKEEP usage and hence should not be used for end of batch +check. Instead, the execbuf3 out fence should be used for end of batch check +(See struct drm_i915_gem_execbuffer3). + +Also, in VM_BIND mode, use dma-resv apis for determining object activeness +(See dma_resv_test_signaled() and dma_resv_wait_timeout()) and do not use the +older i915_vma active reference tracking which is deprecated. This should be +easier to get it working with the current TTM backend. + +Mesa use case +-------------- +VM_BIND can potentially reduce the CPU overhead in Mesa (both Vulkan and Iris), +hence improving performance of CPU-bound applications. It also allows us to +implement Vulkan's Sparse Resources. With increasing GPU hardware performance, +reducing CPU overhead becomes more impactful. + + +Other VM_BIND use cases +======================== + +Long running Compute contexts +------------------------------ +Usage of dma-fence expects that they complete in reasonable amount of time. +Compute on the other hand can be long running. Hence it is appropriate for +compute to use user/memory fence (See `User/Memory Fence`_) and dma-fence usage +must be limited to in-kernel consumption only. + +Where GPU page faults are not available, kernel driver upon buffer invalidation +will initiate a suspend (preemption) of long running context, finish the +invalidation, revalidate the BO and then resume the compute context. This is +done by having a per-context preempt fence which is enabled when someone tries +to wait on it and triggers the context preemption. + +User/Memory Fence +~~~~~~~~~~~~~~~~~~ +User/Memory fence is a <address, value> pair. To signal the user fence, the +specified value will be written at the specified virtual address and wakeup the +waiting process. User fence can be signaled either by the GPU or kernel async +worker (like upon bind completion). User can wait on a user fence with a new +user fence wait ioctl. + +Here is some prior work on this: +https://patchwork.freedesktop.org/patch/349417/ + +Low Latency Submission +~~~~~~~~~~~~~~~~~~~~~~~ +Allows compute UMD to directly submit GPU jobs instead of through execbuf +ioctl. This is made possible by VM_BIND is not being synchronized against +execbuf. VM_BIND allows bind/unbind of mappings required for the directly +submitted jobs. + +Debugger +--------- +With debug event interface user space process (debugger) is able to keep track +of and act upon resources created by another process (debugged) and attached +to GPU via vm_bind interface. + +GPU page faults +---------------- +GPU page faults when supported (in future), will only be supported in the +VM_BIND mode. While both the older execbuf mode and the newer VM_BIND mode of +binding will require using dma-fence to ensure residency, the GPU page faults +mode when supported, will not use any dma-fence as residency is purely managed +by installing and removing/invalidating page table entries. + +Page level hints settings +-------------------------- +VM_BIND allows any hints setting per mapping instead of per BO. Possible hints +include placement and atomicity. Sub-BO level placement hint will be even more +relevant with upcoming GPU on-demand page fault support. + +Page level Cache/CLOS settings +------------------------------- +VM_BIND allows cache/CLOS settings per mapping instead of per BO. + +Evictable page table allocations +--------------------------------- +Make pagetable allocations evictable and manage them similar to VM_BIND +mapped objects. Page table pages are similar to persistent mappings of a +VM (difference here are that the page table pages will not have an i915_vma +structure and after swapping pages back in, parent page link needs to be +updated). + +Shared Virtual Memory (SVM) support +------------------------------------ +VM_BIND interface can be used to map system memory directly (without gem BO +abstraction) using the HMM interface. SVM is only supported with GPU page +faults enabled. + +VM_BIND UAPI +============= + +.. kernel-doc:: Documentation/gpu/rfc/i915_vm_bind.h diff --git a/Documentation/gpu/rfc/index.rst b/Documentation/gpu/rfc/index.rst index 91e93a705230..476719771eef 100644 --- a/Documentation/gpu/rfc/index.rst +++ b/Documentation/gpu/rfc/index.rst @@ -23,3 +23,11 @@ host such documentation: .. toctree:: i915_scheduler.rst + +.. toctree:: + + i915_small_bar.rst + +.. toctree:: + + i915_vm_bind.rst diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 60d1d7ee0719..393d218e4a0c 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -222,7 +222,7 @@ Convert drivers to use drm_fbdev_generic_setup() Most drivers can use drm_fbdev_generic_setup(). Driver have to implement atomic modesetting and GEM vmap support. Historically, generic fbdev emulation expected the framebuffer in system memory or system-like memory. By employing -struct dma_buf_map, drivers with frambuffers in I/O memory can be supported +struct iosys_map, drivers with frambuffers in I/O memory can be supported as well. Contact: Maintainer of the driver you plan to convert @@ -234,13 +234,35 @@ Reimplement functions in drm_fbdev_fb_ops without fbdev A number of callback functions in drm_fbdev_fb_ops could benefit from being rewritten without dependencies on the fbdev module. Some of the -helpers could further benefit from using struct dma_buf_map instead of +helpers could further benefit from using struct iosys_map instead of raw pointers. Contact: Thomas Zimmermann <tzimmermann@suse.de>, Daniel Vetter Level: Advanced +Benchmark and optimize blitting and format-conversion function +-------------------------------------------------------------- + +Drawing to dispay memory quickly is crucial for many applications' +performance. + +On at least x86-64, sys_imageblit() is significantly slower than +cfb_imageblit(), even though both use the same blitting algorithm and +the latter is written for I/O memory. It turns out that cfb_imageblit() +uses movl instructions, while sys_imageblit apparently does not. This +seems to be a problem with gcc's optimizer. DRM's format-conversion +helpers might be subject to similar issues. + +Benchmark and optimize fbdev's sys_() helpers and DRM's format-conversion +helpers. In cases that can be further optimized, maybe implement a different +algorithm. For micro-optimizations, use movl/movq instructions explicitly. +That might possibly require architecture-specific helpers (e.g., storel() +storeq()). + +Contact: Thomas Zimmermann <tzimmermann@suse.de> + +Level: Intermediate drm_framebuffer_funcs and drm_mode_config_funcs.fb_create cleanup ----------------------------------------------------------------- @@ -268,17 +290,6 @@ Contact: Daniel Vetter Level: Intermediate -Clean up mmap forwarding ------------------------- - -A lot of drivers forward gem mmap calls to dma-buf mmap for imported buffers. -And also a lot of them forward dma-buf mmap to the gem mmap implementations. -There's drm_gem_prime_mmap() for this now, but still needs to be rolled out. - -Contact: Daniel Vetter - -Level: Intermediate - Generic fbdev defio support --------------------------- @@ -311,42 +322,6 @@ Contact: Daniel Vetter, Noralf Tronnes Level: Advanced -Garbage collect fbdev scrolling acceleration --------------------------------------------- - -Scroll acceleration has been disabled in fbcon. Now it works as the old -SCROLL_REDRAW mode. A ton of code was removed in fbcon.c and the hook bmove was -removed from fbcon_ops. -Remaining tasks: - -- a bunch of the hooks in fbcon_ops could be removed or simplified by calling - directly instead of the function table (with a switch on p->rotate) - -- fb_copyarea is unused after this, and can be deleted from all drivers - -- after that, fb_copyarea can be deleted from fb_ops in include/linux/fb.h as - well as cfb_copyarea - -Note that not all acceleration code can be deleted, since clearing and cursor -support is still accelerated, which might be good candidates for further -deletion projects. - -Contact: Daniel Vetter - -Level: Intermediate - -idr_init_base() ---------------- - -DRM core&drivers uses a lot of idr (integer lookup directories) for mapping -userspace IDs to internal objects, and in most places ID=0 means NULL and hence -is never used. Switching to idr_init_base() for these would make the idr more -efficient. - -Contact: Daniel Vetter - -Level: Starter - struct drm_gem_object_funcs --------------------------- @@ -356,19 +331,6 @@ converted, except for struct drm_driver.gem_prime_mmap. Level: Intermediate -Rename CMA helpers to DMA helpers ---------------------------------- - -CMA (standing for contiguous memory allocator) is really a bit an accident of -what these were used for first, a much better name would be DMA helpers. In the -text these should even be called coherent DMA memory helpers (so maybe CDM, but -no one knows what that means) since underneath they just use dma_alloc_coherent. - -Contact: Laurent Pinchart, Daniel Vetter - -Level: Intermediate (mostly because it is a huge tasks without good partial -milestones, not technically itself that challenging) - connector register/unregister fixes ----------------------------------- @@ -445,24 +407,54 @@ Contact: Emil Velikov, respective driver maintainers Level: Intermediate -Use struct dma_buf_map throughout codebase ------------------------------------------- +Use struct iosys_map throughout codebase +---------------------------------------- -Pointers to shared device memory are stored in struct dma_buf_map. Each +Pointers to shared device memory are stored in struct iosys_map. Each instance knows whether it refers to system or I/O memory. Most of the DRM-wide -interface have been converted to use struct dma_buf_map, but implementations +interface have been converted to use struct iosys_map, but implementations often still use raw pointers. -The task is to use struct dma_buf_map where it makes sense. +The task is to use struct iosys_map where it makes sense. -* Memory managers should use struct dma_buf_map for dma-buf-imported buffers. -* TTM might benefit from using struct dma_buf_map internally. -* Framebuffer copying and blitting helpers should operate on struct dma_buf_map. +* Memory managers should use struct iosys_map for dma-buf-imported buffers. +* TTM might benefit from using struct iosys_map internally. +* Framebuffer copying and blitting helpers should operate on struct iosys_map. Contact: Thomas Zimmermann <tzimmermann@suse.de>, Christian König, Daniel Vetter Level: Intermediate +Review all drivers for setting struct drm_mode_config.{max_width,max_height} correctly +-------------------------------------------------------------------------------------- + +The values in struct drm_mode_config.{max_width,max_height} describe the +maximum supported framebuffer size. It's the virtual screen size, but many +drivers treat it like limitations of the physical resolution. + +The maximum width depends on the hardware's maximum scanline pitch. The +maximum height depends on the amount of addressable video memory. Review all +drivers to initialize the fields to the correct values. + +Contact: Thomas Zimmermann <tzimmermann@suse.de> + +Level: Intermediate + +Request memory regions in all drivers +------------------------------------- + +Go through all drivers and add code to request the memory regions that the +driver uses. This requires adding calls to request_mem_region(), +pci_request_region() or similar functions. Use helpers for managed cleanup +where possible. + +Drivers are pretty bad at doing this and there used to be conflicts among +DRM and fbdev drivers. Still, it's the correct thing to do. + +Contact: Thomas Zimmermann <tzimmermann@suse.de> + +Level: Starter + Core refactorings ================= @@ -480,8 +472,12 @@ This is a really varied tasks with lots of little bits and pieces: achieved by using an IPI to the local processor. * There's a massive confusion of different panic handlers. DRM fbdev emulation - helpers have one, but on top of that the fbcon code itself also has one. We - need to make sure that they stop fighting over each another. + helpers had their own (long removed), but on top of that the fbcon code itself + also has one. We need to make sure that they stop fighting over each other. + This is worked around by checking ``oops_in_progress`` at various entry points + into the DRM fbdev emulation helpers. A much cleaner approach here would be to + switch fbcon to the `threaded printk support + <https://lwn.net/Articles/800946/>`_. * ``drm_can_sleep()`` is a mess. It hides real bugs in normal operations and isn't a full solution for panic paths. We need to make sure that it only @@ -493,16 +489,15 @@ This is a really varied tasks with lots of little bits and pieces: even spinlocks (because NMI and hardirq can panic too). We need to either make sure to not call such paths, or trylock everything. Really tricky. -* For the above locking troubles reasons it's pretty much impossible to - attempt a synchronous modeset from panic handlers. The only thing we could - try to achive is an atomic ``set_base`` of the primary plane, and hope that - it shows up. Everything else probably needs to be delayed to some worker or - something else which happens later on. Otherwise it just kills the box - harder, prevent the panic from going out on e.g. netconsole. +* A clean solution would be an entirely separate panic output support in KMS, + bypassing the current fbcon support. See `[PATCH v2 0/3] drm: Add panic handling + <https://lore.kernel.org/dri-devel/20190311174218.51899-1-noralf@tronnes.org/>`_. -* There's also proposal for a simplied DRM console instead of the full-blown - fbcon and DRM fbdev emulation. Any kind of panic handling tricks should - obviously work for both console, in case we ever get kmslog merged. +* Encoding the actual oops and preceding dmesg in a QR might help with the + dread "important stuff scrolled away" problem. See `[RFC][PATCH] Oops messages + transfer using QR codes + <https://lore.kernel.org/lkml/1446217392-11981-1-git-send-email-alexandru.murtaza@intel.com/>`_ + for some example code that could be reused. Contact: Daniel Vetter @@ -583,6 +578,20 @@ Level: Advanced Better Testing ============== +Add unit tests using the Kernel Unit Testing (KUnit) framework +-------------------------------------------------------------- + +The `KUnit <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_ +provides a common framework for unit tests within the Linux kernel. Having a +test suite would allow to identify regressions earlier. + +A good candidate for the first unit tests are the format-conversion helpers in +``drm_format_helper.c``. + +Contact: Javier Martinez Canillas <javierm@redhat.com> + +Level: Intermediate + Enable trinity for DRM ---------------------- @@ -642,6 +651,17 @@ See drivers/gpu/drm/amd/display/TODO for tasks. Contact: Harry Wentland, Alex Deucher +vmwgfx: Replace hashtable with Linux' implementation +---------------------------------------------------- + +The vmwgfx driver uses its own hashtable implementation. Replace the +code with Linux' implementation and update the callers. It's mostly a +refactoring task, but the interfaces are different. + +Contact: Zack Rusin, Thomas Zimmermann <tzimmermann@suse.de> + +Level: Intermediate + Bootsplash ========== @@ -659,6 +679,74 @@ Contact: Sam Ravnborg Level: Advanced +Brightness handling on devices with multiple internal panels +============================================================ + +On x86/ACPI devices there can be multiple backlight firmware interfaces: +(ACPI) video, vendor specific and others. As well as direct/native (PWM) +register programming by the KMS driver. + +To deal with this backlight drivers used on x86/ACPI call +acpi_video_get_backlight_type() which has heuristics (+quirks) to select +which backlight interface to use; and backlight drivers which do not match +the returned type will not register themselves, so that only one backlight +device gets registered (in a single GPU setup, see below). + +At the moment this more or less assumes that there will only +be 1 (internal) panel on a system. + +On systems with 2 panels this may be a problem, depending on +what interface acpi_video_get_backlight_type() selects: + +1. native: in this case the KMS driver is expected to know which backlight + device belongs to which output so everything should just work. +2. video: this does support controlling multiple backlights, but some work + will need to be done to get the output <-> backlight device mapping + +The above assumes both panels will require the same backlight interface type. +Things will break on systems with multiple panels where the 2 panels need +a different type of control. E.g. one panel needs ACPI video backlight control, +where as the other is using native backlight control. Currently in this case +only one of the 2 required backlight devices will get registered, based on +the acpi_video_get_backlight_type() return value. + +If this (theoretical) case ever shows up, then supporting this will need some +work. A possible solution here would be to pass a device and connector-name +to acpi_video_get_backlight_type() so that it can deal with this. + +Note in a way we already have a case where userspace sees 2 panels, +in dual GPU laptop setups with a mux. On those systems we may see +either 2 native backlight devices; or 2 native backlight devices. + +Userspace already has code to deal with this by detecting if the related +panel is active (iow which way the mux between the GPU and the panels +points) and then uses that backlight device. Userspace here very much +assumes a single panel though. It picks only 1 of the 2 backlight devices +and then only uses that one. + +Note that all userspace code (that I know off) is currently hardcoded +to assume a single panel. + +Before the recent changes to not register multiple (e.g. video + native) +/sys/class/backlight devices for a single panel (on a single GPU laptop), +userspace would see multiple backlight devices all controlling the same +backlight. + +To deal with this userspace had to always picks one preferred device under +/sys/class/backlight and will ignore the others. So to support brightness +control on multiple panels userspace will need to be updated too. + +There are plans to allow brightness control through the KMS API by adding +a "display brightness" property to drm_connector objects for panels. This +solves a number of issues with the /sys/class/backlight API, including not +being able to map a sysfs backlight device to a specific connector. Any +userspace changes to add support for brightness control on devices with +multiple panels really should build on top of this new KMS property. + +Contact: Hans de Goede + +Level: Advanced + Outside DRM =========== diff --git a/Documentation/gpu/vgaarbiter.rst b/Documentation/gpu/vgaarbiter.rst index 339ed5fecd2e..bde3c0afb059 100644 --- a/Documentation/gpu/vgaarbiter.rst +++ b/Documentation/gpu/vgaarbiter.rst @@ -100,7 +100,7 @@ In-kernel interface .. kernel-doc:: include/linux/vgaarb.h :internal: -.. kernel-doc:: drivers/gpu/vga/vgaarb.c +.. kernel-doc:: drivers/pci/vgaarb.c :export: libpciaccess diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst index 941f0e7e5eef..49db221c0f52 100644 --- a/Documentation/gpu/vkms.rst +++ b/Documentation/gpu/vkms.rst @@ -102,12 +102,6 @@ Debugging: - kms_plane: some test cases are failing due to timeout on capturing CRC; -- kms_flip: when running test cases in sequence, some successful individual - test cases are failing randomly; when individually, some successful test - cases display in the log the following error:: - - [drm:vkms_prepare_fb [vkms]] ERROR vmap failed: -4 - Virtual hardware (vblank-less) mode: - VKMS already has support for vblanks simulated via hrtimers, which can be @@ -124,17 +118,10 @@ Add Plane Features There's lots of plane features we could add support for: -- Multiple overlay planes. [Good to get started] - -- Clearing primary plane: clear primary plane before plane composition (at the - start) for correctness of pixel blend ops. It also guarantees alpha channel - is cleared in the target buffer for stable crc. [Good to get started] - - ARGB format on primary plane: blend the primary plane into background with translucent alpha. -- Support when the primary plane isn't exactly matching the output size: blend - the primary plane into the black background. +- Add background color KMS property[Good to get started]. - Full alpha blending on all planes. |
