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2022-06-13Merge branch 'hns3-fixres'David S. Miller5-37/+86
Guangbin Huang says: ==================== net: hns3: add some fixes for -net This series adds some fixes for the HNS3 ethernet driver. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: fix tm port shapping of fibre port is incorrect after driver initializationGuangbin Huang3-4/+10
Currently in driver initialization process, driver will set shapping parameters of tm port to default speed read from firmware. However, the speed of SFP module may not be default speed, so shapping parameters of tm port may be incorrect. To fix this problem, driver sets new shapping parameters for tm port after getting exact speed of SFP module in this case. Fixes: 88d10bd6f730 ("net: hns3: add support for multiple media type") Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: fix PF rss size initialization bugJie Wang1-1/+3
Currently hns3 driver misuses the VF rss size to initialize the PF rss size in hclge_tm_vport_tc_info_update. So this patch fix it by checking the vport id before initialization. Fixes: 7347255ea389 ("net: hns3: refactor PF rss get APIs with new common rss get APIs") Signed-off-by: Jie Wang <wangjie125@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: restore tm priority/qset to default settings when tc disabledGuangbin Huang2-31/+65
Currently, settings parameters of schedule mode, dwrr, shaper of tm priority or qset of one tc are only be set when tc is enabled, they are not restored to the default settings when tc is disabled. It confuses users when they cat tm_priority or tm_qset files of debugfs. So this patch fixes it. Fixes: 848440544b41 ("net: hns3: Add support of TX Scheduler & Shaper to HNS3 driver") Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: modify the ring param print infoJie Wang1-1/+1
Currently tx push is also a ring param. So the original ring param print info in hns3_is_ringparam_changed should be adjusted. Fixes: 07fdc163ac88 ("net: hns3: refactor hns3_set_ringparam()") Signed-off-by: Jie Wang <wangjie125@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: don't push link state to VF if unaliveJian Shen1-0/+6
It's unnecessary to push link state to unalive VF, and the VF will query link state from PF when it being start works. Fixes: 18b6e31f8bf4 ("net: hns3: PF add support for pushing link status to VFs") Signed-off-by: Jian Shen <shenjian15@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13net: hns3: set port base vlan tbl_sta to false before removing old vlanGuangbin Huang1-0/+1
When modify port base vlan, the port base vlan tbl_sta needs to set to false before removing old vlan, to indicate this operation is not finish. Fixes: c0f46de30c96 ("net: hns3: fix port base vlan add fail when concurrent with reset") Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-13drm/i915/uc: remove accidental static from a local variableJani Nikula1-1/+1
The arrays are static const, but the pointer shouldn't be static. Fixes: 3d832f370d16 ("drm/i915/uc: Allow platforms to have GuC but not HuC") Cc: John Harrison <John.C.Harrison@Intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220511094619.27889-1-jani.nikula@intel.com (cherry picked from commit 5821a0bbb4c39960975d29d6b58ae290088db0ed)
2022-06-13io_uring: fix double unlock for pbuf selectPavel Begunkov1-3/+1
io_buffer_select(), which is the only caller of io_ring_buffer_select(), fully handles locking, mutex unlock in io_ring_buffer_select() will lead to double unlock. Fixes: c7fb19428d67d ("io_uring: add support for ring mapped supplied buffers") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13io_uring: kbuf: fix bug of not consuming ring buffer in partial io caseHao Xu1-4/+16
When we use ring-mapped provided buffer, we should consume it before arm poll if partial io has been done. Otherwise the buffer may be used by other requests and thus we lost the data. Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers") Signed-off-by: Hao Xu <howeyxu@tencent.com> [pavel: 5.19 rebase] Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13io_uring: openclose: fix bug of closing wrong fixed fileHao Xu1-1/+1
Don't update ret until fixed file is closed, otherwise the file slot becomes the error code. Fixes: a7c41b4687f5 ("io_uring: let IORING_OP_FILES_UPDATE support choosing fixed file slots") Signed-off-by: Hao Xu <howeyxu@tencent.com> [pavel: 5.19 rebase] Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13genirq/PM: Unexport {suspend,resume}_device_irqs()Lukas Wunner1-2/+0
Ever since {suspend,resume}_device_irqs() were introduced in 2009 by commit 0a0c5168df27 ("PM: Introduce functions for suspending and resuming device interrupts"), they've been exported even though there are no module users and never will be: The functions are solely called by the PM core, which is always built-in. Unexport them. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/fad9b50609f9d9828ea14772dbd4d195713f1c4b.1654846687.git.lukas@wunner.de
2022-06-13drm/i915: Individualize fences before adding to dma_resv objNirmoy Das2-21/+30
_i915_vma_move_to_active() can receive > 1 fences for multiple batch buffers submission. Because dma_resv_add_fence() can only accept one fence at a time, change _i915_vma_move_to_active() to be aware of multiple fences so that it can add individual fences to the dma resv object. v6: fix multi-line comment. v5: remove double fence reservation for batch VMAs. v4: Reserve fences for composite_fence on multi-batch contexts and also reserve fence slots to composite_fence for each VMAs. v3: dma_resv_reserve_fences is not cumulative so pass num_fences. v2: make sure to reserve enough fence slots before adding. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5614 Fixes: 544460c33821 ("drm/i915: Multi-BB execbuf") Cc: <stable@vger.kernel.org> # v5.16+ Signed-off-by: Nirmoy Das <nirmoy.das@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com> Signed-off-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220525095955.15371-1-nirmoy.das@intel.com (cherry picked from commit 420a07b841d03f6a436d8c06571c69aa5c783897) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2022-06-13drm/i915/gt: Fix memory leaks in per-gt sysfsAshutosh Dixit5-22/+19
All kmalloc'd kobjects need a kobject_put() to free memory. For example in previous code, kobj_gt_release() never gets called. The requirement of kobject_put() now results in a slightly different code organization. v2: s/gtn/gt/ (Andi) Fixes: b770bcfae9ad ("drm/i915/gt: create per-tile sysfs interface") Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Acked-by: Andrzej Hajda <andrzej.hajda@intel.com> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/a6f6686517c85fba61a0c45097f5bb4fe7e257fb.1653484574.git.ashutosh.dixit@intel.com (cherry picked from commit 69d6bf5c3754ffc491896632438417d1cedc2c68) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2022-06-13drm/i915/reset: Fix error_state_read ptr + offset useAlan Previn1-3/+12
Fix our pointer offset usage in error_state_read when there is no i915_gpu_coredump but buf offset is non-zero. This fixes a kernel page fault can happen when multiple tests are running concurrently in a loop and one is producing engine resets and consuming the i915 error_state dump while the other is forcing full GT resets. (takes a while to trigger). The dmesg call trace: [ 5590.803000] BUG: unable to handle page fault for address: ffffffffa0b0e000 [ 5590.803009] #PF: supervisor read access in kernel mode [ 5590.803013] #PF: error_code(0x0000) - not-present page [ 5590.803016] PGD 5814067 P4D 5814067 PUD 5815063 PMD 109de4067 PTE 0 [ 5590.803022] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 5590.803026] CPU: 5 PID: 13656 Comm: i915_hangman Tainted: G U 5.17.0-rc5-ups69-guc-err-capt-rev6+ #136 [ 5590.803033] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-M LP4x RVP, BIOS ADLPFWI1.R00. 3031.A02.2201171222 01/17/2022 [ 5590.803039] RIP: 0010:memcpy_erms+0x6/0x10 [ 5590.803045] Code: fe ff ff cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe [ 5590.803054] RSP: 0018:ffffc90003a8fdf0 EFLAGS: 00010282 [ 5590.803057] RAX: ffff888107ee9000 RBX: ffff888108cb1a00 RCX: 0000000000000f8f [ 5590.803061] RDX: 0000000000001000 RSI: ffffffffa0b0e000 RDI: ffff888107ee9071 [ 5590.803065] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 5590.803069] R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000019 [ 5590.803073] R13: 0000000000174fff R14: 0000000000001000 R15: ffff888107ee9000 [ 5590.803077] FS: 00007f62a99bee80(0000) GS:ffff88849f880000(0000) knlGS:0000000000000000 [ 5590.803082] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5590.803085] CR2: ffffffffa0b0e000 CR3: 000000010a1a8004 CR4: 0000000000770ee0 [ 5590.803089] PKRU: 55555554 [ 5590.803091] Call Trace: [ 5590.803093] <TASK> [ 5590.803096] error_state_read+0xa1/0xd0 [i915] [ 5590.803175] kernfs_fop_read_iter+0xb2/0x1b0 [ 5590.803180] new_sync_read+0x116/0x1a0 [ 5590.803185] vfs_read+0x114/0x1b0 [ 5590.803189] ksys_read+0x63/0xe0 [ 5590.803193] do_syscall_64+0x38/0xc0 [ 5590.803197] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 5590.803201] RIP: 0033:0x7f62aaea5912 [ 5590.803204] Code: c0 e9 b2 fe ff ff 50 48 8d 3d 5a b9 0c 00 e8 05 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24 [ 5590.803213] RSP: 002b:00007fff5b659ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 5590.803218] RAX: ffffffffffffffda RBX: 0000000000100000 RCX: 00007f62aaea5912 [ 5590.803221] RDX: 000000000008b000 RSI: 00007f62a8c4000f RDI: 0000000000000006 [ 5590.803225] RBP: 00007f62a8bcb00f R08: 0000000000200010 R09: 0000000000101000 [ 5590.803229] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000006 [ 5590.803233] R13: 0000000000075000 R14: 00007f62a8acb010 R15: 0000000000200000 [ 5590.803238] </TASK> [ 5590.803240] Modules linked in: i915 ttm drm_buddy drm_dp_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops prime_numbers nfnetlink br_netfilter overlay mei_pxp mei_hdcp x86_pkg_temp_thermal coretemp kvm_intel snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core snd_pcm mei_me mei fuse ip_tables x_tables crct10dif_pclmul e1000e crc32_pclmul ptp i2c_i801 ghash_clmulni_intel i2c_smbus pps_core [last unloa ded: ttm] [ 5590.803277] CR2: ffffffffa0b0e000 [ 5590.803280] ---[ end trace 0000000000000000 ]--- Fixes: 0e39037b3165 ("drm/i915: Cache the error string") Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com> Reviewed-by: John Harrison <John.C.Harrison@Intel.com> Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220311004311.514198-2-alan.previn.teres.alexis@intel.com (cherry picked from commit 3304033a1e69cd81a2044b4422f0d7e593afb4e6) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2022-06-13dt-bindings: clock: renesas,rzg2l: Simplify header file referencesGeert Uytterhoeven1-4/+3
The bindings already uses <dt-bindings/clock/r9a0*-cpg.h> to refer to the header files with DT binding definitions for core clocks. Use more wildcards to simplify more references to these files. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/f274ad16010798dd4a45d2dca5f870da8acbb470.1654696009.git.geert+renesas@glider.be
2022-06-13clk: renesas: rza1: Remove struct rz_cpgGeert Uytterhoeven1-18/+15
The register block base pointer as stored in the reg member of the rz_cpg structure is only used during initialization. Hence move it to a local variable, and pass it as a parameter to rz_cpg_register_clock(). After this, the data member is the only remaining member of the rz_cpg structure, so the whole structure can be replaced by the data member. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/2380285576edaa4ad3dc5eca7e0ca418f068c6ef.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: r8a7779: Remove struct r8a7779_cpgGeert Uytterhoeven1-18/+9
All but the data member of the r8a7779_cpg structure are unused, so the whole structure can be replaced by the single member used. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/eb94c0f6c54a4f3a7e0e07f12781333a700c0a05.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: r8a7778: Remove struct r8a7778_cpgGeert Uytterhoeven1-22/+9
All but the data member of the r8a7778_cpg structure are unused, so the whole structure can be replaced by the single member used. Remove the mapping of the CPG registers, as no code uses the mapped registers. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/4123c1c40a901195f00a825d434553d2052829aa.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: sh73a0: Remove sh73a0_cpg.regGeert Uytterhoeven1-13/+13
The register block base pointer as stored in the reg member of the sh73a0_cpg structure is only used during initialization. Hence move it to a local variable, and pass it as a parameter to sh73a0_cpg_register_clock(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/5423e43d0cf518691965412fb510097d23ac5955.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: r8a7740: Remove r8a7740_cpg.regGeert Uytterhoeven1-10/+10
The register block base pointer as stored in the reg member of the r8a7740_cpg structure is only used during initialization. Hence move it to a local variable, and pass it as a parameter to r8a7740_cpg_register_clock(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/7ec676bcc36ef1eda02c2db328c527fc5fd44e99.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: r8a73a4: Remove r8a73a4_cpg.regGeert Uytterhoeven1-11/+11
The register block base pointer as stored in the reg member of the r8a73a4_cpg structure is only used during initialization. Hence move it to a local variable, and pass it as a parameter to r8a73a4_cpg_register_clock(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/f835f3dfcf3bf754065e5002663952cc6341caac.1654694831.git.geert+renesas@glider.be
2022-06-13clk: renesas: r8a779f0: Add SDHI0 clockWolfram Sang1-0/+1
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20220603233437.21819-1-wsa+renesas@sang-engineering.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
2022-06-13soc: renesas: rcar-sysc: Optimize rcar_sysc_area struct sizesGeert Uytterhoeven2-4/+4
Reduce the sizes of the rcar_sysc_area and rcar_gen4_sysc_area structures: - parent is in the range [-1..32] or [-1..64], so s8 is sufficient, - flags needs just 3 bits (for now), so u8 is plenty. This reduces kernel size by: - 288 bytes for an R-Car Gen1+Gen2 kernel (arm32), - 1772 bytes for an R-Car Gen3+Gen4 kernel (arm64). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/cbbc8f464743d636895c048de61aa610d75392de.1654701156.git.geert+renesas@glider.be
2022-06-13soc: renesas: r8a779a0-sysc: Fix A2DP1 and A2CV[2357] PDR valuesGeert Uytterhoeven1-5/+5
The PDR values for the A2DP1 and A2CV[2357] power areas on R-Car V3U are incorrect (copied-and-pasted from A2DP0 and A2CV[0146]). Fix them. Reported-by: Renesas Vietnam via Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Fixes: 1b4298f000064cc2 ("soc: renesas: r8a779a0-sysc: Add r8a779a0 support") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/87bc2e70ba4082970cf8c65871beae4be3503189.1654696188.git.geert+renesas@glider.be
2022-06-13drm/probe-helper: abstract .get_modes() connector helper callJani Nikula1-10/+19
Abstract the .get_modes() connector helper call, including the override/firmware EDID fallback, for clarity. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/a4de51efc246e4f5bcbf7b84d66bb49aaf7fd974.1654674560.git.jani.nikula@intel.com
2022-06-13drm/edid: add new interfaces around struct drm_edidJani Nikula2-24/+230
Add new functions drm_edid_read(), drm_edid_read_ddc(), and drm_edid_read_custom() to replace drm_get_edid() and drm_do_get_edid() for reading the EDID. The transition is expected to happen over a fairly long time. Note that the new drm_edid_read*() functions do not do any of the connector updates anymore. The reading and parsing will be completely separated from each other. Add new functions drm_edid_alloc(), drm_edid_dup(), and drm_edid_free() for allocating and freeing drm_edid containers. Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/5a6532a94cad6a79424f6d1918dbe7b7d607ac03.1654674560.git.jani.nikula@intel.com
2022-06-13drm/edid: keep track of alloc size in drm_do_get_edid()Jani Nikula1-8/+19
We'll want to return the allocated buffer size in the future. Keep track of it. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/8e4261d8c2947ea99240ea929f09a04878235f4e.1654674560.git.jani.nikula@intel.com
2022-06-13drm/edid: add block count and data helper functions for drm_edidJani Nikula1-7/+35
Add drm_edid based block count and data access helper functions that take the EDID allocated size into account. At the moment, the allocated size should always match the EDID size indicated by the extension count, but this will change in the future. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1a68c8667a88e7c451b001ad8bd86c8badb57fb8.1654674560.git.jani.nikula@intel.com
2022-06-13drm/edid: abstract cea data block collection sizeJani Nikula1-3/+21
Add a function to get the cea data block collection size. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/5339ab3249400a3c41001967e7ff2611b58e0425.1654674560.git.jani.nikula@intel.com
2022-06-13drm/edid: fix CTA data block collection size for CTA version 3Jani Nikula1-2/+0
The CTA Data Block Collection is valid only for CTA extension version 3. In versions 1 and 2, it is a reserved block, which we ignore. The DTD start offset (byte 2, or d in CTA-861 spec), which determines the CTA Data Block Collection size, is specified slightly differently for different versions: Version 1: d = offset for the byte following the reserved data block. If no data is provided in the reserved data block, then d=4. If no DTDs are provided, then d=0 Version 2: d = offset for the byte following the reserved data block. If no data is provided in the reserved data block, then d=4. If d=0, then no detailed timing descriptors are provided, and no data is provided in the reserved data block. Version 3: d = offset for the byte following the data block collection. If no data is provided in the data block collection, then d=4. If d=0, then no detailed timing descriptors are provided, and no data is provided in the data block collection. Ever since commit 9e50b9d55e9c ("drm: edid: Add some bounds checking"), we've interpreted 0 to mean there are no DTDs but it's all Data Blocks. Per the spec, Data Blocks are only valid for version 3, where we should interpret 0 to mean there are no data blocks. Follow the spec (and hope the EDIDs follow it too). Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/2a4c94417f024cbafc5d4ca0a74e4617fc4325d1.1654674560.git.jani.nikula@intel.com
2022-06-13arm64: dts: arm/juno: Drop erroneous 'mbox-name' propertyRob Herring1-1/+0
The 'mbox-name' property in the Juno mailbox node is undocumented and unused. It's the consumer side of the mailbox binding that have 'mbox-names' properties. Link: https://lore.kernel.org/r/20220610213308.2288094-1-robh@kernel.org Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2022-06-13arm64: dts: arm/fvp-base-revc: Remove 'panel-dpi' compatibleRob Herring1-1/+1
The rtsm-display panel timing node was removed in commit 928faf5e3e8d ("arm64: dts: fvp: Remove panel timings"). Without the node, 'panel-dpi' is not needed either. Link: https://lore.kernel.org/r/20220610204057.2203419-1-robh@kernel.org Cc: Robin Murphy <robin.murphy@arm.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2022-06-13arm64: defconfig: Enable R8A779G0 SoCGeert Uytterhoeven1-0/+1
Enable the Renesas R-Car V4H (R8A779G0) SoC in the ARM64 defconfig. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/eb672fad7c9a340812079a07539d670f42f4ad41.1654855105.git.geert+renesas@glider.be
2022-06-13ARM: shmobile: defconfig: Refresh for v5.19-rc1Geert Uytterhoeven1-1/+3
Refresh the defconfig for Renesas ARM systems: - Move CONFIG_SLAB=y (moved in commit 7b42f1041c98f5d7 ("mm: Kconfig: move swap and slab config options to the MM section")), - Enable CONFIG_RENESAS_RZN1WDT (RZN1D-DB), - Enable CONFIG_RTC_DRV_RZN1 (RZN1-DB). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/7ef31a41e1a15d0cedeb6cfc496ce70a78102e32.1654855000.git.geert+renesas@glider.be
2022-06-13io_uring: fix not locked access to fixed buf tablePavel Begunkov1-17/+17
We can look inside the fixed buffer table only while holding ->uring_lock, however in some cases we don't do the right async prep for IORING_OP_{WRITE,READ}_FIXED ending up with NULL req->imu forcing making an io-wq worker to try to resolve the fixed buffer without proper locking. Move req->imu setup into early req init paths, i.e. io_prep_rw(), which is called unconditionally for rw requests and under uring_lock. Fixes: 634d00df5e1cf ("io_uring: add full-fledged dynamic buffers support") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13io_uring: fix races with buffer table unregisterPavel Begunkov1-0/+7
Fixed buffer table quiesce might unlock ->uring_lock, potentially letting new requests to be submitted, don't allow those requests to use the table as they will race with unregistration. Reported-and-tested-by: van fantasy <g1042620637@gmail.com> Fixes: bd54b6fe3316ec ("io_uring: implement fixed buffers registration similar to fixed files") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13io_uring: fix races with file table unregisterPavel Begunkov1-0/+8
Fixed file table quiesce might unlock ->uring_lock, potentially letting new requests to be submitted, don't allow those requests to use the table as they will race with unregistration. Reported-and-tested-by: van fantasy <g1042620637@gmail.com> Fixes: 05f3fb3c53975 ("io_uring: avoid ring quiesce for fixed file set unregister and update") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
2022-06-13clk: renesas: r8a779f0: Add thermal clockWolfram Sang1-0/+1
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20220525151130.24103-1-wsa+renesas@sang-engineering.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
2022-06-13sched: Remove the limitation of WF_ON_CPU on wakelist if wakee cpu is idleTianchen Ding2-13/+14
Wakelist can help avoid cache bouncing and offload the overhead of waker cpu. So far, using wakelist within the same llc only happens on WF_ON_CPU, and this limitation could be removed to further improve wakeup performance. The commit 518cd6234178 ("sched: Only queue remote wakeups when crossing cache boundaries") disabled queuing tasks on wakelist when the cpus share llc. This is because, at that time, the scheduler must send IPIs to do ttwu_queue_wakelist. Nowadays, ttwu_queue_wakelist also supports TIF_POLLING, so this is not a problem now when the wakee cpu is in idle polling. Benefits: Queuing the task on idle cpu can help improving performance on waker cpu and utilization on wakee cpu, and further improve locality because the wakee cpu can handle its own rq. This patch helps improving rt on our real java workloads where wakeup happens frequently. Consider the normal condition (CPU0 and CPU1 share same llc) Before this patch: CPU0 CPU1 select_task_rq() idle rq_lock(CPU1->rq) enqueue_task(CPU1->rq) notify CPU1 (by sending IPI or CPU1 polling) resched() After this patch: CPU0 CPU1 select_task_rq() idle add to wakelist of CPU1 notify CPU1 (by sending IPI or CPU1 polling) rq_lock(CPU1->rq) enqueue_task(CPU1->rq) resched() We see CPU0 can finish its work earlier. It only needs to put task to wakelist and return. While CPU1 is idle, so let itself handle its own runqueue data. This patch brings no difference about IPI. This patch only takes effect when the wakee cpu is: 1) idle polling 2) idle not polling For 1), there will be no IPI with or without this patch. For 2), there will always be an IPI before or after this patch. Before this patch: waker cpu will enqueue task and check preempt. Since "idle" will be sure to be preempted, waker cpu must send a resched IPI. After this patch: waker cpu will put the task to the wakelist of wakee cpu, and send an IPI. Benchmark: We've tested schbench, unixbench, and hachbench on both x86 and arm64. On x86 (Intel Xeon Platinum 8269CY): schbench -m 2 -t 8 Latency percentiles (usec) before after 50.0000th: 8 6 75.0000th: 10 7 90.0000th: 11 8 95.0000th: 12 8 *99.0000th: 13 10 99.5000th: 15 11 99.9000th: 18 14 Unixbench with full threads (104) before after Dhrystone 2 using register variables 3011862938 3009935994 -0.06% Double-Precision Whetstone 617119.3 617298.5 0.03% Execl Throughput 27667.3 27627.3 -0.14% File Copy 1024 bufsize 2000 maxblocks 785871.4 784906.2 -0.12% File Copy 256 bufsize 500 maxblocks 210113.6 212635.4 1.20% File Copy 4096 bufsize 8000 maxblocks 2328862.2 2320529.1 -0.36% Pipe Throughput 145535622.8 145323033.2 -0.15% Pipe-based Context Switching 3221686.4 3583975.4 11.25% Process Creation 101347.1 103345.4 1.97% Shell Scripts (1 concurrent) 120193.5 123977.8 3.15% Shell Scripts (8 concurrent) 17233.4 17138.4 -0.55% System Call Overhead 5300604.8 5312213.6 0.22% hackbench -g 1 -l 100000 before after Time 3.246 2.251 On arm64 (Ampere Altra): schbench -m 2 -t 8 Latency percentiles (usec) before after 50.0000th: 14 10 75.0000th: 19 14 90.0000th: 22 16 95.0000th: 23 16 *99.0000th: 24 17 99.5000th: 24 17 99.9000th: 28 25 Unixbench with full threads (80) before after Dhrystone 2 using register variables 3536194249 3537019613 0.02% Double-Precision Whetstone 629383.6 629431.6 0.01% Execl Throughput 65920.5 65846.2 -0.11% File Copy 1024 bufsize 2000 maxblocks 1063722.8 1064026.8 0.03% File Copy 256 bufsize 500 maxblocks 322684.5 318724.5 -1.23% File Copy 4096 bufsize 8000 maxblocks 2348285.3 2328804.8 -0.83% Pipe Throughput 133542875.3 131619389.8 -1.44% Pipe-based Context Switching 3215356.1 3576945.1 11.25% Process Creation 108520.5 120184.6 10.75% Shell Scripts (1 concurrent) 122636.3 121888 -0.61% Shell Scripts (8 concurrent) 17462.1 17381.4 -0.46% System Call Overhead 4429998.9 4435006.7 0.11% hackbench -g 1 -l 100000 before after Time 4.217 2.916 Our patch has improvement on schbench, hackbench and Pipe-based Context Switching of unixbench when there exists idle cpus, and no obvious regression on other tests of unixbench. This can help improve rt in scenes where wakeup happens frequently. Signed-off-by: Tianchen Ding <dtcccc@linux.alibaba.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <vschneid@redhat.com> Link: https://lore.kernel.org/r/20220608233412.327341-3-dtcccc@linux.alibaba.com
2022-06-13sched: Fix the check of nr_running at queue wakelistTianchen Ding1-1/+5
The commit 2ebb17717550 ("sched/core: Offload wakee task activation if it the wakee is descheduling") checked rq->nr_running <= 1 to avoid task stacking when WF_ON_CPU. Per the ordering of writes to p->on_rq and p->on_cpu, observing p->on_cpu (WF_ON_CPU) in ttwu_queue_cond() implies !p->on_rq, IOW p has gone through the deactivate_task() in __schedule(), thus p has been accounted out of rq->nr_running. As such, the task being the only runnable task on the rq implies reading rq->nr_running == 0 at that point. The benchmark result is in [1]. [1] https://lore.kernel.org/all/e34de686-4e85-bde1-9f3c-9bbc86b38627@linux.alibaba.com/ Suggested-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Tianchen Ding <dtcccc@linux.alibaba.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <vschneid@redhat.com> Link: https://lore.kernel.org/r/20220608233412.327341-2-dtcccc@linux.alibaba.com
2022-06-13sched: Allow newidle balancing to bail out of load_balanceJosh Don1-1/+7
While doing newidle load balancing, it is possible for new tasks to arrive, such as with pending wakeups. newidle_balance() already accounts for this by exiting the sched_domain load_balance() iteration if it detects these cases. This is very important for minimizing wakeup latency. However, if we are already in load_balance(), we may stay there for a while before returning back to newidle_balance(). This is most exacerbated if we enter a 'goto redo' loop in the LBF_ALL_PINNED case. A very straightforward workaround to this is to adjust should_we_balance() to bail out if we're doing a CPU_NEWLY_IDLE balance and new tasks are detected. This was tested with the following reproduction: - two threads that take turns sleeping and waking each other up are affined to two cores - a large number of threads with 100% utilization are pinned to all other cores Without this patch, wakeup latency was ~120us for the pair of threads, almost entirely spent in load_balance(). With this patch, wakeup latency is ~6us. Signed-off-by: Josh Don <joshdon@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220609025515.2086253-1-joshdon@google.com
2022-06-13sched/deadline: Use proc_douintvec_minmax() limit minimum valueYajun Deng1-2/+4
sysctl_sched_dl_period_max and sysctl_sched_dl_period_min are unsigned integer, but proc_dointvec() wouldn't return error even if we set a negative number. Use proc_douintvec_minmax() instead of proc_dointvec(). Add extra1 for sysctl_sched_dl_period_max and extra2 for sysctl_sched_dl_period_min. It's just an optimization for match data and proc_handler in struct ctl_table. The 'if (period < min || period > max)' in __checkparam_dl() will work fine even if there hasn't this patch. Signed-off-by: Yajun Deng <yajun.deng@linux.dev> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Daniel Bristot de Oliveira <bristot@kernel.org> Link: https://lore.kernel.org/r/20220607101807.249965-1-yajun.deng@linux.dev
2022-06-13sched/fair: Optimize and simplify rq leaf_cfs_rq_listChengming Zhou1-64/+28
We notice the rq leaf_cfs_rq_list has two problems when do bugfix backports and some test profiling. 1. cfs_rqs under throttled subtree could be added to the list, and make their fully decayed ancestors on the list, even though not needed. 2. #1 also make the leaf_cfs_rq_list management complex and error prone, this is the list of related bugfix so far: commit 31bc6aeaab1d ("sched/fair: Optimize update_blocked_averages()") commit fe61468b2cbc ("sched/fair: Fix enqueue_task_fair warning") commit b34cb07dde7c ("sched/fair: Fix enqueue_task_fair() warning some more") commit 39f23ce07b93 ("sched/fair: Fix unthrottle_cfs_rq() for leaf_cfs_rq list") commit 0258bdfaff5b ("sched/fair: Fix unfairness caused by missing load decay") commit a7b359fc6a37 ("sched/fair: Correctly insert cfs_rq's to list on unthrottle") commit fdaba61ef8a2 ("sched/fair: Ensure that the CFS parent is added after unthrottling") commit 2630cde26711 ("sched/fair: Add ancestors of unthrottled undecayed cfs_rq") commit 31bc6aeaab1d ("sched/fair: Optimize update_blocked_averages()") delete every cfs_rq under throttled subtree from rq->leaf_cfs_rq_list, and delete the throttled_hierarchy() test in update_blocked_averages(), which optimized update_blocked_averages(). But those later bugfix add cfs_rqs under throttled subtree back to rq->leaf_cfs_rq_list again, with their fully decayed ancestors, for the integrity of rq->leaf_cfs_rq_list. This patch takes another method, skip all cfs_rqs under throttled hierarchy when list_add_leaf_cfs_rq(), to completely make cfs_rqs under throttled subtree off the leaf_cfs_rq_list. So we don't need to consider throttled related things in enqueue_entity(), unthrottle_cfs_rq() and enqueue_task_fair(), which simplify the code a lot. Also optimize update_blocked_averages() since cfs_rqs under throttled hierarchy and their ancestors won't be on the leaf_cfs_rq_list. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lore.kernel.org/r/20220601021848.76943-1-zhouchengming@bytedance.com
2022-06-13sched/fair: Consider CPU affinity when allowing NUMA imbalance in find_idlest_group()K Prateek Nayak1-3/+13
In the case of systems containing multiple LLCs per socket, like AMD Zen systems, users want to spread bandwidth hungry applications across multiple LLCs. Stream is one such representative workload where the best performance is obtained by limiting one stream thread per LLC. To ensure this, users are known to pin the tasks to a specify a subset of the CPUs consisting of one CPU per LLC while running such bandwidth hungry tasks. Suppose we kickstart a multi-threaded task like stream with 8 threads using taskset or numactl to run on a subset of CPUs on a 2 socket Zen3 server where each socket contains 128 CPUs (0-63,128-191 in one socket, 64-127,192-255 in another socket) Eg: numactl -C 0,16,32,48,64,80,96,112 ./stream8 Here each CPU in the list is from a different LLC and 4 of those LLCs are on one socket, while the other 4 are on another socket. Ideally we would prefer that each stream thread runs on a different CPU from the allowed list of CPUs. However, the current heuristics in find_idlest_group() do not allow this during the initial placement. Suppose the first socket (0-63,128-191) is our local group from which we are kickstarting the stream tasks. The first four stream threads will be placed in this socket. When it comes to placing the 5th thread, all the allowed CPUs are from the local group (0,16,32,48) would have been taken. However, the current scheduler code simply checks if the number of tasks in the local group is fewer than the allowed numa-imbalance threshold. This threshold was previously 25% of the NUMA domain span (in this case threshold = 32) but after the v6 of Mel's patchset "Adjust NUMA imbalance for multiple LLCs", got merged in sched-tip, Commit: e496132ebedd ("sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans multiple LLCs") it is now equal to number of LLCs in the NUMA domain, for processors with multiple LLCs. (in this case threshold = 8). For this example, the number of tasks will always be within threshold and thus all the 8 stream threads will be woken up on the first socket thereby resulting in sub-optimal performance. The following sched_wakeup_new tracepoint output shows the initial placement of tasks in the current tip/sched/core on the Zen3 machine: stream-5313 [016] d..2. 627.005036: sched_wakeup_new: comm=stream pid=5315 prio=120 target_cpu=032 stream-5313 [016] d..2. 627.005086: sched_wakeup_new: comm=stream pid=5316 prio=120 target_cpu=048 stream-5313 [016] d..2. 627.005141: sched_wakeup_new: comm=stream pid=5317 prio=120 target_cpu=000 stream-5313 [016] d..2. 627.005183: sched_wakeup_new: comm=stream pid=5318 prio=120 target_cpu=016 stream-5313 [016] d..2. 627.005218: sched_wakeup_new: comm=stream pid=5319 prio=120 target_cpu=016 stream-5313 [016] d..2. 627.005256: sched_wakeup_new: comm=stream pid=5320 prio=120 target_cpu=016 stream-5313 [016] d..2. 627.005295: sched_wakeup_new: comm=stream pid=5321 prio=120 target_cpu=016 Once the first four threads are distributed among the allowed CPUs of socket one, the rest of the treads start piling on these same CPUs when clearly there are CPUs on the second socket that can be used. Following the initial pile up on a small number of CPUs, though the load-balancer eventually kicks in, it takes a while to get to {4}{4} and even {4}{4} isn't stable as we observe a bunch of ping ponging between {4}{4} to {5}{3} and back before a stable state is reached much later (1 Stream thread per allowed CPU) and no more migration is required. We can detect this piling and avoid it by checking if the number of allowed CPUs in the local group are fewer than the number of tasks running in the local group and use this information to spread the 5th task out into the next socket (after all, the goal in this slowpath is to find the idlest group and the idlest CPU during the initial placement!). The following sched_wakeup_new tracepoint output shows the initial placement of tasks after adding this fix on the Zen3 machine: stream-4485 [016] d..2. 230.784046: sched_wakeup_new: comm=stream pid=4487 prio=120 target_cpu=032 stream-4485 [016] d..2. 230.784123: sched_wakeup_new: comm=stream pid=4488 prio=120 target_cpu=048 stream-4485 [016] d..2. 230.784167: sched_wakeup_new: comm=stream pid=4489 prio=120 target_cpu=000 stream-4485 [016] d..2. 230.784222: sched_wakeup_new: comm=stream pid=4490 prio=120 target_cpu=112 stream-4485 [016] d..2. 230.784271: sched_wakeup_new: comm=stream pid=4491 prio=120 target_cpu=096 stream-4485 [016] d..2. 230.784322: sched_wakeup_new: comm=stream pid=4492 prio=120 target_cpu=080 stream-4485 [016] d..2. 230.784368: sched_wakeup_new: comm=stream pid=4493 prio=120 target_cpu=064 We see that threads are using all of the allowed CPUs and there is no pileup. No output is generated for tracepoint sched_migrate_task with this patch due to a perfect initial placement which removes the need for balancing later on - both across NUMA boundaries and within NUMA boundaries for stream. Following are the results from running 8 Stream threads with and without pinning on a dual socket Zen3 Machine (2 x 64C/128T): During the testing of this patch, the tip sched/core was at commit: 089c02ae2771 "ftrace: Use preemption model accessors for trace header printout" Pinning is done using: numactl -C 0,16,32,48,64,80,96,112 ./stream8 5.18.0-rc1 5.18.0-rc1 5.18.0-rc1 tip sched/core tip sched/core tip sched/core (no pinning) + pinning + this-patch + pinning Copy: 109364.74 (0.00 pct) 94220.50 (-13.84 pct) 158301.28 (44.74 pct) Scale: 109670.26 (0.00 pct) 90210.59 (-17.74 pct) 149525.64 (36.34 pct) Add: 129029.01 (0.00 pct) 101906.00 (-21.02 pct) 186658.17 (44.66 pct) Triad: 127260.05 (0.00 pct) 106051.36 (-16.66 pct) 184327.30 (44.84 pct) Pinning currently hurts the performance compared to unbound case on tip/sched/core. With the addition of this patch, we are able to outperform tip/sched/core by a good margin with pinning. Following are the results from running 16 Stream threads with and without pinning on a dual socket IceLake Machine (2 x 32C/64T): NUMA Topology of Intel Skylake machine: Node 1: 0,2,4,6 ... 126 (Even numbers) Node 2: 1,3,5,7 ... 127 (Odd numbers) Pinning is done using: numactl -C 0-15 ./stream16 5.18.0-rc1 5.18.0-rc1 5.18.0-rc1 tip sched/core tip sched/core tip sched/core (no pinning) +pinning + this-patch + pinning Copy: 85815.31 (0.00 pct) 149819.21 (74.58 pct) 156807.48 (82.72 pct) Scale: 64795.60 (0.00 pct) 97595.07 (50.61 pct) 99871.96 (54.13 pct) Add: 71340.68 (0.00 pct) 111549.10 (56.36 pct) 114598.33 (60.63 pct) Triad: 68890.97 (0.00 pct) 111635.16 (62.04 pct) 114589.24 (66.33 pct) In case of Icelake machine, with single LLC per socket, pinning across the two sockets reduces cache contention, thus showing great improvement in pinned case which is further benefited by this patch. Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Link: https://lkml.kernel.org/r/20220407111222.22649-1-kprateek.nayak@amd.com
2022-06-13sched/numa: Adjust imb_numa_nr to a better approximation of memory channelsMel Gorman1-8/+15
For a single LLC per node, a NUMA imbalance is allowed up until 25% of CPUs sharing a node could be active. One intent of the cut-off is to avoid an imbalance of memory channels but there is no topological information based on active memory channels. Furthermore, there can be differences between nodes depending on the number of populated DIMMs. A cut-off of 25% was arbitrary but generally worked. It does have a severe corner cases though when an parallel workload is using 25% of all available CPUs over-saturates memory channels. This can happen due to the initial forking of tasks that get pulled more to one node after early wakeups (e.g. a barrier synchronisation) that is not quickly corrected by the load balancer. The LB may fail to act quickly as the parallel tasks are considered to be poor migrate candidates due to locality or cache hotness. On a range of modern Intel CPUs, 12.5% appears to be a better cut-off assuming all memory channels are populated and is used as the new cut-off point. A minimum of 1 is specified to allow a communicating pair to remain local even for CPUs with low numbers of cores. For modern AMDs, there are multiple LLCs and are not affected. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lore.kernel.org/r/20220520103519.1863-5-mgorman@techsingularity.net
2022-06-13sched/numa: Apply imbalance limitations consistentlyMel Gorman1-36/+45
The imbalance limitations are applied inconsistently at fork time and at runtime. At fork, a new task can remain local until there are too many running tasks even if the degree of imbalance is larger than NUMA_IMBALANCE_MIN which is different to runtime. Secondly, the imbalance figure used during load balancing is different to the one used at NUMA placement. Load balancing uses the number of tasks that must move to restore imbalance where as NUMA balancing uses the total imbalance. In combination, it is possible for a parallel workload that uses a small number of CPUs without applying scheduler policies to have very variable run-to-run performance. [lkp@intel.com: Fix build breakage for arc-allyesconfig] Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lore.kernel.org/r/20220520103519.1863-4-mgorman@techsingularity.net
2022-06-13sched/numa: Do not swap tasks between nodes when spare capacity is availableMel Gorman1-0/+9
If a destination node has spare capacity but there is an imbalance then two tasks are selected for swapping. If the tasks have no numa group or are within the same NUMA group, it's simply shuffling tasks around without having any impact on the compute imbalance. Instead, it's just punishing one task to help another. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lore.kernel.org/r/20220520103519.1863-3-mgorman@techsingularity.net
2022-06-13sched/numa: Initialise numa_migrate_retryMel Gorman1-0/+1
On clone, numa_migrate_retry is inherited from the parent which means that the first NUMA placement of a task is non-deterministic. This affects when load balancing recognises numa tasks and whether to migrate "regular", "remote" or "all" tasks between NUMA scheduler domains. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lore.kernel.org/r/20220520103519.1863-2-mgorman@techsingularity.net
2022-06-13locking/lockdep: Use sched_clock() for random numbersSebastian Andrzej Siewior1-1/+1
Since the rewrote of prandom_u32(), in the commit mentioned below, the function uses sleeping locks which extracing random numbers and filling the batch. This breaks lockdep on PREEMPT_RT because lock_pin_lock() disables interrupts while calling __lock_pin_lock(). This can't be moved earlier because the main user of the function (rq_pin_lock()) invokes that function after disabling interrupts in order to acquire the lock. The cookie does not require random numbers as its goal is to provide a random value in order to notice unexpected "unlock + lock" sites. Use sched_clock() to provide random numbers. Fixes: a0103f4d86f88 ("random32: use real rng for non-deterministic randomness") Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/YoNn3pTkm5+QzE5k@linutronix.de
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