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2018-04-19clocksource/imx-tpm: Correct -ETIME return condition checkAnson Huang1-1/+1
The additional brakects added to tpm_set_next_event's return value computation causes (int) forced type conversion NOT taking effect, and the incorrect value return will cause various system timer issue, like RCU stall etc.. Remove the additional brackets to make sure tpm_set_next_event always returns correct value. Fixes: 059ab7b82eec ("clocksource/drivers/imx-tpm: Add imx tpm timer support") Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Dong Aisheng <Aisheng.dong@nxp.com> Cc: stable@vger.kernel.org Cc: daniel.lezcano@linaro.org Cc: Linux-imx@nxp.com Link: https://lkml.kernel.org/r/1524117883-2484-1-git-send-email-Anson.Huang@nxp.com
2018-04-16Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds4-10/+257
Pull missed timer updates from Thomas Gleixner: "This is a branch which got forgotten during the merge window, but it contains only fixes and hardware enablement. No fundamental changes. - Various fixes for the imx-tpm clocksource driver - A new timer driver for the NCPM7xx SoC family" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: clocksource/drivers/imx-tpm: Add different counter width support clocksource/drivers/imx-tpm: Correct some registers operation flow clocksource/drivers/imx-tpm: Fix typo of clock name dt-bindings: timer: tpm: fix typo of clock name clocksource/drivers/npcm: Add NPCM7xx timer driver dt-binding: timer: document NPCM7xx timer DT bindings
2018-04-05Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds3-0/+1004
Pull ARM SoC platform updates from Arnd Bergmann: "This release brings up a new platform based on the old ARM9 core: the Nuvoton NPCM is used as a baseboard management controller, competing with the better known ASpeed AST2xx series. Another important change is the addition of ARMv7-A based chips in mach-stm32. The older parts in this platform are ARMv7-M based microcontrollers, now they are expanding to general-purpose workloads. The other changes are the usual defconfig updates to enable additional drivers, lesser bugfixes. The largest updates as often are the ongoing OMAP cleanups, but we also have a number of changes for the older PXA and davinci platforms this time. For the Renesas shmobile/r-car platform, some new infrastructure is needed to make the watchdog work correctly. Supporting Multiprocessing on Allwinner A80 required a significant amount of new code, but is not doing anything unexpected" * tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (179 commits) arm: npcm: modify configuration for the NPCM7xx BMC. MAINTAINERS: update entry for ARM/berlin ARM: omap2: fix am43xx build without L2X0 ARM: davinci: da8xx: simplify CFGCHIP regmap_config ARM: davinci: da8xx: fix oops in USB PHY driver due to stack allocated platform_data ARM: multi_v7_defconfig: add NXP FlexCAN IP support ARM: multi_v7_defconfig: enable thermal driver for i.MX devices ARM: multi_v7_defconfig: add RN5T618 PMIC family support ARM: multi_v7_defconfig: add NXP graphics drivers ARM: multi_v7_defconfig: add GPMI NAND controller support ARM: multi_v7_defconfig: add OCOTP driver for NXP SoCs ARM: multi_v7_defconfig: configure I2C driver built-in arm64: defconfig: add CONFIG_UNIPHIER_THERMAL and CONFIG_SNI_AVE ARM: imx: fix imx6sll-only build ARM: imx: select ARM_CPU_SUSPEND for CPU_IDLE as well ARM: mxs_defconfig: Re-sync defconfig ARM: imx_v4_v5_defconfig: Use the generic fsl-asoc-card driver ARM: imx_v4_v5_defconfig: Re-sync defconfig arm64: defconfig: enable stmmac ethernet to defconfig ARM: EXYNOS: Simplify code in coupled CPU idle hot path ...
2018-04-02Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-genericLinus Torvalds3-167/+0
Pul removal of obsolete architecture ports from Arnd Bergmann: "This removes the entire architecture code for blackfin, cris, frv, m32r, metag, mn10300, score, and tile, including the associated device drivers. I have been working with the (former) maintainers for each one to ensure that my interpretation was right and the code is definitely unused in mainline kernels. Many had fond memories of working on the respective ports to start with and getting them included in upstream, but also saw no point in keeping the port alive without any users. In the end, it seems that while the eight architectures are extremely different, they all suffered the same fate: There was one company in charge of an SoC line, a CPU microarchitecture and a software ecosystem, which was more costly than licensing newer off-the-shelf CPU cores from a third party (typically ARM, MIPS, or RISC-V). It seems that all the SoC product lines are still around, but have not used the custom CPU architectures for several years at this point. In contrast, CPU instruction sets that remain popular and have actively maintained kernel ports tend to all be used across multiple licensees. [ See the new nds32 port merged in the previous commit for the next generation of "one company in charge of an SoC line, a CPU microarchitecture and a software ecosystem" - Linus ] The removal came out of a discussion that is now documented at https://lwn.net/Articles/748074/. Unlike the original plans, I'm not marking any ports as deprecated but remove them all at once after I made sure that they are all unused. Some architectures (notably tile, mn10300, and blackfin) are still being shipped in products with old kernels, but those products will never be updated to newer kernel releases. After this series, we still have a few architectures without mainline gcc support: - unicore32 and hexagon both have very outdated gcc releases, but the maintainers promised to work on providing something newer. At least in case of hexagon, this will only be llvm, not gcc. - openrisc, risc-v and nds32 are still in the process of finishing their support or getting it added to mainline gcc in the first place. They all have patched gcc-7.3 ports that work to some degree, but complete upstream support won't happen before gcc-8.1. Csky posted their first kernel patch set last week, their situation will be similar [ Palmer Dabbelt points out that RISC-V support is in mainline gcc since gcc-7, although gcc-7.3.0 is the recommended minimum - Linus ]" This really says it all: 2498 files changed, 95 insertions(+), 467668 deletions(-) * tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits) MAINTAINERS: UNICORE32: Change email account staging: iio: remove iio-trig-bfin-timer driver tty: hvc: remove tile driver tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers serial: remove tile uart driver serial: remove m32r_sio driver serial: remove blackfin drivers serial: remove cris/etrax uart drivers usb: Remove Blackfin references in USB support usb: isp1362: remove blackfin arch glue usb: musb: remove blackfin port usb: host: remove tilegx platform glue pwm: remove pwm-bfin driver i2c: remove bfin-twi driver spi: remove blackfin related host drivers watchdog: remove bfin_wdt driver can: remove bfin_can driver mmc: remove bfin_sdh driver input: misc: remove blackfin rotary driver input: keyboard: remove bf54x driver ...
2018-04-02Merge tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linuxLinus Torvalds3-0/+276
Pull nds32 architecture support from Greentime Hu: "This contains the core nds32 Linux port (including interrupt controller driver and timer driver), which has been through seven rounds of review on mailing list. It is able to boot to shell and passes most LTP-2017 testsuites in nds32 AE3XX platform: Total Tests: 1901 Total Skipped Tests: 618 Total Failures: 78" Reviewed-by: Arnd Bergmann <arnd@arndb.de> * tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux: (44 commits) nds32: To use the generic dump_stack() nds32: fix building failed if using elf toolchain. nios2: add ioremap_nocache declaration before include asm-generic/io.h. nds32: fix building failed if using older version gcc. dt-bindings: timer: Add andestech atcpit100 timer binding doc clocksource/drivers/atcpit100: VDSO support clocksource/drivers/atcpit100: Add andestech atcpit100 timer net: faraday add nds32 support. irqchip: Andestech Internal Vector Interrupt Controller driver dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller dt-bindings: nds32 SoC Bindings dt-bindings: nds32 L2 cache controller Bindings dt-bindings: nds32 CPU Bindings MAINTAINERS: Add nds32 nds32: Build infrastructure nds32: defconfig nds32: Miscellaneous header files nds32: Device tree support nds32: Generic timers support nds32: Loadable modules ...
2018-03-30clocksource/drivers/imx-tpm: Add different counter width supportAnson Huang1-8/+25
Different TPM modules have different width counters which is 16-bit or 32-bit, the counter width can be read from TPM_PARAM register bit[23:16], this patch adds dynamic check for counter width to support both 16-bit and 32-bit TPM modules. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-03-30clocksource/drivers/imx-tpm: Correct some registers operation flowAnson Huang1-1/+7
According to i.MX7ULP reference manual, TPM_SC_CPWMS can ONLY be written when counter is disabled, TPM_SC_TOF is write-1-clear, TPM_C0SC_CHF is also write-1-clear, correct these registers initialization flow; Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-03-30clocksource/drivers/imx-tpm: Fix typo of clock nameAnson Huang1-1/+1
The clock name should be ipg instead of igp. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-03-30clocksource/drivers/npcm: Add NPCM7xx timer driverTomer Maimon3-0/+224
Add Nuvoton BMC NPCM7xx timer driver. The clocksource Enable 24-bit TIMER0 and TIMER1 counters, while TIMER0 serve as clockevent and TIMER1 serve as clocksource. Signed-off-by: Tomer Maimon <tmaimon77@gmail.com> Reviewed-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-03-09clocksource/atmel-st: Add 'depends on HAS_IOMEM' to fix unmet dependencyMasahiro Yamada1-0/+1
The ATMEL_ST config selects MFD_SYSCON, but does not depend on HAS_IOMEM. Compile testing on architecture without HAS_IOMEM causes "unmet direct dependencies" in Kconfig phase. Detected by "make ARCH=score allyesconfig". Add the proper dependency to the ATMEL_ST config. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Link: https://lkml.kernel.org/r/1520335233-11277-1-git-send-email-yamada.masahiro@socionext.com
2018-03-07Merge tag 'metag_remove_2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jhogan/metag into asm-genericArnd Bergmann3-167/+0
Remove metag architecture These patches remove the metag architecture and tightly dependent drivers from the kernel. With the 4.16 kernel the ancient gcc 4.2.4 based metag toolchain we have been using is hitting compiler bugs, so now seems a good time to drop it altogether. * tag 'metag_remove_2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: i2c: img-scb: Drop METAG dependency media: img-ir: Drop METAG dependency watchdog: imgpdc: Drop METAG dependency MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE tty: Remove metag DA TTY and console driver clocksource: Remove metag generic timer driver irqchip: Remove metag irqchip drivers Drop a bunch of metag references docs: Remove remaining references to metag docs: Remove metag docs metag: Remove arch/metag/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-03-07Merge tag 'omap-for-v4.17/timer-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/socArnd Bergmann3-0/+1004
Pull "Move omap timer to drivers for 4.17" from Tony Lindgren: This series from Keerthy and Ladislav Michl move omap dmtimer code to drivers. As we don't want to export custom timer functions to random drivers, we also need to update the related PWM driver to pass the timer specific functions in platform data. Note that this series is based on a merge of omap1 specific timer fix and omap2+ platform data clean-up to keep things working and make the move a bit simpler. * tag 'omap-for-v4.17/timer-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap: clocksource: timer-ti-dm: Check prescaler value clocksource: timer-ti-dm: Consolidate set source clocksource: timer-ti-dm: Make unexported functions static ARM: OMAP: pdata-quirks: Remove unused timer pdata pwm: pwm-omap-dmtimer: Adapt driver to utilize dmtimer pdata ops clocksource: timer-ti-dm: Hook device platform data if not already assigned clocksource: timer-ti-dm: Populate the timer ops to the pdata clocksource: timer-ti-dm: Add timer ops to the platform data structure ARM: OMAP: Move dmtimer driver out of plat-omap to drivers under clocksource clocksource: timer-ti-dm: Replace architecture ARM: OMAP: Move dmtimer.h out of plat-omap ARM: OMAP: timer: Wrap the inline functions under OMAP2PLUS define ARM: OMAP: dmtimer: Remove all the exports ARM: OMAP: Fix dmtimer init for omap1
2018-02-28clocksource: timer-ti-dm: Check prescaler valueLadislav Michl1-2/+2
Invalid value silently disables use of the prescaler. Use -1 explicitely for that purpose and error out on invalid value. Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-28clocksource: timer-ti-dm: Consolidate set sourceLadislav Michl1-22/+16
Reorder omap_dm_timer_set_source internals to get source verification more straightforward. Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-28clocksource: timer-ti-dm: Make unexported functions staticLadislav Michl1-109/+115
As dmtimer no longer exports functions, make those previously exported static (this requires few functions to be moved around as their prototypes were deleted). Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-28clocksource/drivers/arc_timer: Update some commentsVineet Gupta1-3/+8
TIMER0 interrupt ACK is different for ARC700 and HS3x cores. This came to light in some internal discussions and it is nice to have this documented rather than digging up the PRM (Programmers Reference Manual). Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Link: https://lkml.kernel.org/r/1519241491-12570-1-git-send-email-vgupta@synopsys.com
2018-02-28clocksource/drivers/mips-gic-timer: Use correct shift count to extract dataFelix Fietkau1-1/+1
__gic_clocksource_init() extracts the GIC_CONFIG_COUNTBITS field from read_gic_config() by right shifting the register value. The shift count is determined by the most significant bit (__fls) of the bitmask which is wrong as it shifts out the complete bitfield. Use the least significant bit (__ffs) instead to shift the bitfield down to bit 0. Fixes: e07127a077c7 ("clocksource: mips-gic-timer: Use new GIC accessor functions") Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: daniel.lezcano@linaro.org Cc: paul.burton@imgtec.com Link: https://lkml.kernel.org/r/20180228095610.50341-1-nbd@nbd.name
2018-02-26clocksource/drivers/fsl_ftm_timer: Fix error return checkingColin Ian King1-1/+1
The error checks on freq for a negative error return always fails because freq is unsigned and can never be negative. Fix this by making freq a signed long. Detected with Coccinelle: drivers/clocksource/fsl_ftm_timer.c:287:5-9: WARNING: Unsigned expression compared with zero: freq <= 0 drivers/clocksource/fsl_ftm_timer.c:291:5-9: WARNING: Unsigned expression compared with zero: freq <= 0 Fixes: 2529c3a33079 ("clocksource: Add Freescale FlexTimer Module (FTM) timer support") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: kernel-janitors@vger.kernel.org Link: https://lkml.kernel.org/r/20180226113614.3092-1-colin.king@canonical.com
2018-02-23clocksource: Remove metag generic timer driverJames Hogan3-167/+0
Now that arch/metag/ has been removed, remove the metag generic per-thread timer driver. It is of no value without the architecture code. Signed-off-by: James Hogan <jhogan@kernel.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-metag@vger.kernel.org
2018-02-22clocksource: timer-ti-dm: Hook device platform data if not already assignedLadislav Michl1-4/+6
In the case of device tree boot the device platform data is usually NULL so hook the platform data obtained from the match. As part of un-constify the platform_data pointer. Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-22clocksource: timer-ti-dm: Populate the timer ops to the pdataKeerthy1-0/+25
Add the timer ops to the platform data Signed-off-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Tested-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-22ARM: OMAP: Move dmtimer driver out of plat-omap to drivers under clocksourceKeerthy3-0/+977
Move the dmtimer driver out of plat-omap to clocksource. So that non-omap devices also could use this. No Code changes done to the driver file only renamed to timer-ti-dm.c. Also removed the config dependencies for OMAP_DM_TIMER. Signed-off-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Tested-by: Ladislav Michl <ladis@linux-mips.org> [tony@atomide.com: add select omap_dm_timer for omap16xx] Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-02-22treewide/trivial: Remove ';;$' typo noiseIngo Molnar2-3/+3
On lkml suggestions were made to split up such trivial typo fixes into per subsystem patches: --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -439,7 +439,7 @@ setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height) struct efi_uga_draw_protocol *uga = NULL, *first_uga; efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; unsigned long nr_ugas; - u32 *handles = (u32 *)uga_handle;; + u32 *handles = (u32 *)uga_handle; efi_status_t status = EFI_INVALID_PARAMETER; int i; This patch is the result of the following script: $ sed -i 's/;;$/;/g' $(git grep -E ';;$' | grep "\.[ch]:" | grep -vwE 'for|ia64' | cut -d: -f1 | sort | uniq) ... followed by manual review to make sure it's all good. Splitting this up is just crazy talk, let's get over with this and just do it. Reported-by: Pavel Machek <pavel@ucw.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-02-22clocksource/drivers/atcpit100: VDSO supportRick Chen1-0/+18
VDSO needs real-time cycle count to ensure the time accuracy. Unlike others, nds32 architecture does not define clock source, hence VDSO needs atcpit100 offering real-time cycle count to derive the correct time. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Rick Chen <rickchen36@gmail.com> Signed-off-by: Greentime Hu <green.hu@gmail.com>
2018-02-22clocksource/drivers/atcpit100: Add andestech atcpit100 timerRick Chen3-0/+258
ATCPIT100 is often used on the Andes architecture, This timer provide 4 PIT channels. Each PIT channel is a multi-function timer, can be configured as 32,16,8 bit timers or PWM as well. For system timer it will set channel 1 32-bit timer0 as clock source and count downwards until underflow and restart again. It also set channel 0 32-bit timer0 as clock event and count downwards until condition match. It will generate an interrupt for handling periodically. Signed-off-by: Rick Chen <rickchen36@gmail.com> Signed-off-by: Greentime Hu <green.hu@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Add andestech atcpit100 timer
2018-01-08clocksource/drivers/stm32: Start the timer's counter soonerDaniel Lezcano1-3/+18
As we have a lot of timers on this platform, we can have potentially all the timers enabled in the DT, so we don't want to start the timer for every probe otherwise they will be running for nothing as only one will be used. Start the timer only when setting the mode or when the clocksource is enabled. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-20-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Add the timer delay callbackDaniel Lezcano1-0/+13
Add the timer delay callback, that saves us ~90ms of boot time. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-19-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Add clocksource functionalityBenjamin Gaignard1-0/+37
The scene is set for the clocksource functionality, let's add it for this driver. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-18-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Factor out more of the clockevent codeDaniel Lezcano1-25/+82
In order to prepare the clocksource code, let's factor out the clockevent code, split the prescaler and timer width code into separate functions. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-17-git-send-email-daniel.lezcano@linaro.org [ Small edits. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Add oneshot modeBenjamin Gaignard1-12/+44
The stm32 timer block is able to have a counter and a comparator. Instead of using the auto-reload register for periodic events, we switch to oneshot mode by using the comparator register. The timer is able to generate an interrupt when the counter overflows but we don't want that as this counter will be use as a clocksource in the next patches. So it is disabled by the UDIS bit of the control register. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-16-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Compute a prescaler value with a targeted rateBenjamin Gaignard1-1/+11
The prescaler value is arbitrarily set to 1024 without any regard to the timer frequency. For 32-bit timers, there is no need to set a prescaler value as they wrap in an acceptable interval and give the opportunity to have precise timers on this platform. However, for 16-bit timers a prescaler value is needed if we don't want to wrap too often per second which is inefficient and adds more and more error margin. With a targeted clock of 10MHz, the 16 bits are precise enough whatever the timer frequency is as we will compute the prescaler. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-15-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Factor out the timer width sorting codeDaniel Lezcano1-7/+23
In order to clarify and encapsulate the code for upcoming changes, move the timer width check into a function and add some documentation. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-14-git-send-email-daniel.lezcano@linaro.org [ Spelling fixes. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Use the node name as timer nameDaniel Lezcano1-1/+1
As there are different timers on the stm32, use the node name for the timer name in order to give the indication of which timer the kernel is using. /proc/timer_list gives all the information with the right name, otherwise we end up digging in the kernel log and /proc/interrupt to do the connection between the used timer. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-13-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Convert the driver to timer_of primitivesBenjamin Gaignard2-114/+74
Convert the driver to use the timer_of() helpers. This allows the removal of a custom private structure, factors out and simplifies the code. [Daniel Lezcano]: Respin against the critical fix patch and massaged the changelog. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-12-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/stm32: Fix kernel panic with multiple timersDaniel Lezcano1-1/+6
The current code hides a couple of bugs: - The global variable 'clock_event_ddata' is overwritten each time the init function is invoked. This is fixed with a kmemdup() instead of assigning the global variable. That prevents a memory corruption when several timers are defined in the DT. - The clockevent's event_handler is NULL if the time framework does not select the clockevent when registering it, this is fine but the init code generates in any case an interrupt leading to dereference this NULL pointer. The stm32 timer works with shadow registers, a mechanism to cache the registers. When a change is done in one buffered register, we need to artificially generate an event to force the timer to copy the content of the register to the shadowed register. The auto-reload register (ARR) is one of the shadowed register as well as the prescaler register (PSC), so in order to force the copy, we issue an event which in turn leads to an interrupt and the NULL dereference. This is fixed by inverting two lines where we clear the status register before enabling the update event interrupt. As this kernel crash is resulting from the combination of these two bugs, the fixes are grouped into a single patch. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1515418139-23276-11-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/timer-of: Don't request the resource by nameDaniel Lezcano1-4/+4
When the driver does not specify a name for the resource, don't use of_io_request_and_map() but of_iomap(). That prevents resource name allocation conflicts on some platforms which have the same name as the node. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-10-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/timer-of: Store the device node pointer in 'struct timer_of'Daniel Lezcano2-0/+4
Under certain circumstances, some specific operations must be done with the device node pointer, which forces the timer code to propagate the pointer to the functions which need it. In order to consolidate the function signatures in the different drivers by using the timer-of structure, let's store it in the timer-of structure as a handy pointer when it is needed. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-9-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/spreadtrum: Add timer driver for the Spreadtrum SC9860 platformBaolin Wang3-0/+167
The Spreadtrum SC9860 platform will use the architected timers as local clock events, but we also need a broadcast timer device to wake up the CPUs when the CPUs are in sleep mode. The Spreadtrum timer can support 32-bit or 64-bit counters, as well as supporting period mode or one-shot mode. Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Philippe Ombredanne <pombredanne@nexb.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-8-git-send-email-daniel.lezcano@linaro.org [ Minor readability edits. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/timer-of: Add kernel documentationDaniel Lezcano1-0/+37
The current code has no comments, neither any function descriptions. Fix this by adding function descriptions in kernel doc format. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-6-git-send-email-daniel.lezcano@linaro.org [ Spelling and style fixes. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/timer-of: Fix function namesDaniel Lezcano1-18/+18
All the functions are not prefixed with 'timer_of_', fix the naming in order to have the code consistent. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-5-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/tcb_clksrc: Fix clock speed messageRomain Izard1-1/+1
The clock speed displayed at boot in an information message was 500 kHz too high compared to its real value. As the value is not used anywhere, there is no functional impact. Fix the rounding formula to display the correct value. Signed-off-by: Romain Izard <romain.izard.pro@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-4-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/owl: Add the S700 timerAndreas Färber1-0/+1
Actions S700 has two 2Hz timers like S500, and four TIMx timers like S900. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-3-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-08clocksource/drivers/owl: Adopt TIMER_OF_DECLARE()Andreas Färber1-2/+2
The following commit: 1727339590fd ("clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE") deprecated CLOCKSOURCE_OF_DECLARE(), so adopt the new TIMER_OF_DECLARE() macro instead. Reported-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-2-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-11-23Merge tag 'for-linus-timers-conversion-final-v4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into timers/urgentThomas Gleixner1-7/+53
Pull the last batch of manual timer conversions from Kees Cook: - final batch of "non trivial" timer conversions (multi-tree dependencies, things Coccinelle couldn't handle, etc). - treewide conversions via Coccinelle, in 4 steps: - DEFINE_TIMER() functions converted to struct timer_list * argument - init_timer() -> setup_timer() - setup_timer() -> timer_setup() - setup_timer() -> timer_setup() (with a single embedded structure) - deprecated timer API removals (init_timer(), setup_*timer()) - finalization of new API (remove global casts)
2017-11-16Merge tag 'kvm-4.15-1' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds1-4/+31
Pull KVM updates from Radim Krčmář: "First batch of KVM changes for 4.15 Common: - Python 3 support in kvm_stat - Accounting of slabs to kmemcg ARM: - Optimized arch timer handling for KVM/ARM - Improvements to the VGIC ITS code and introduction of an ITS reset ioctl - Unification of the 32-bit fault injection logic - More exact external abort matching logic PPC: - Support for running hashed page table (HPT) MMU mode on a host that is using the radix MMU mode; single threaded mode on POWER 9 is added as a pre-requisite - Resolution of merge conflicts with the last second 4.14 HPT fixes - Fixes and cleanups s390: - Some initial preparation patches for exitless interrupts and crypto - New capability for AIS migration - Fixes x86: - Improved emulation of LAPIC timer mode changes, MCi_STATUS MSRs, and after-reset state - Refined dependencies for VMX features - Fixes for nested SMI injection - A lot of cleanups" * tag 'kvm-4.15-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (89 commits) KVM: s390: provide a capability for AIS state migration KVM: s390: clear_io_irq() requests are not expected for adapter interrupts KVM: s390: abstract conversion between isc and enum irq_types KVM: s390: vsie: use common code functions for pinning KVM: s390: SIE considerations for AP Queue virtualization KVM: s390: document memory ordering for kvm_s390_vcpu_wakeup KVM: PPC: Book3S HV: Cosmetic post-merge cleanups KVM: arm/arm64: fix the incompatible matching for external abort KVM: arm/arm64: Unify 32bit fault injection KVM: arm/arm64: vgic-its: Implement KVM_DEV_ARM_ITS_CTRL_RESET KVM: arm/arm64: Document KVM_DEV_ARM_ITS_CTRL_RESET KVM: arm/arm64: vgic-its: Free caches when GITS_BASER Valid bit is cleared KVM: arm/arm64: vgic-its: New helper functions to free the caches KVM: arm/arm64: vgic-its: Remove kvm_its_unmap_device arm/arm64: KVM: Load the timer state when enabling the timer KVM: arm/arm64: Rework kvm_timer_should_fire KVM: arm/arm64: Get rid of kvm_timer_flush_hwstate KVM: arm/arm64: Avoid phys timer emulation in vcpu entry/exit KVM: arm/arm64: Move phys_timer_emulate function KVM: arm/arm64: Use kvm_arm_timer_set/get_reg for guest register traps ...
2017-11-15Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds1-3/+22
Pull arm64 updates from Will Deacon: "The big highlight is support for the Scalable Vector Extension (SVE) which required extensive ABI work to ensure we don't break existing applications by blowing away their signal stack with the rather large new vector context (<= 2 kbit per vector register). There's further work to be done optimising things like exception return, but the ABI is solid now. Much of the line count comes from some new PMU drivers we have, but they're pretty self-contained and I suspect we'll have more of them in future. Plenty of acronym soup here: - initial support for the Scalable Vector Extension (SVE) - improved handling for SError interrupts (required to handle RAS events) - enable GCC support for 128-bit integer types - remove kernel text addresses from backtraces and register dumps - use of WFE to implement long delay()s - ACPI IORT updates from Lorenzo Pieralisi - perf PMU driver for the Statistical Profiling Extension (SPE) - perf PMU driver for Hisilicon's system PMUs - misc cleanups and non-critical fixes" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (97 commits) arm64: Make ARMV8_DEPRECATED depend on SYSCTL arm64: Implement __lshrti3 library function arm64: support __int128 on gcc 5+ arm64/sve: Add documentation arm64/sve: Detect SVE and activate runtime support arm64/sve: KVM: Hide SVE from CPU features exposed to guests arm64/sve: KVM: Treat guest SVE use as undefined instruction execution arm64/sve: KVM: Prevent guests from using SVE arm64/sve: Add sysctl to set the default vector length for new processes arm64/sve: Add prctl controls for userspace vector length management arm64/sve: ptrace and ELF coredump support arm64/sve: Preserve SVE registers around EFI runtime service calls arm64/sve: Preserve SVE registers around kernel-mode NEON use arm64/sve: Probe SVE capabilities and usable vector lengths arm64: cpufeature: Move sys_caps_initialised declarations arm64/sve: Backend logic for setting the vector length arm64/sve: Signal handling support arm64/sve: Support vector length resetting for new processes arm64/sve: Core task context handling arm64/sve: Low-level CPU setup ...
2017-11-14clocksource/timer_of: Rename timer_of_exit to timer_of_cleanupBenjamin Gaignard2-2/+9
Change the function name to something more explicit since it is only used in init error cases. Add __init annotation and description about the function usage. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: mark.rutland@arm.com Cc: devicetree@vger.kernel.org Cc: alexandre.torgue@st.com Cc: arnd@arndb.de Cc: julien.thierry@arm.com Cc: daniel.lezcano@linaro.org Cc: linux@armlinux.org.uk Cc: robh+dt@kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: mcoquelin.stm32@gmail.com Cc: sudeep.holla@arm.com Cc: ludovic.barre@st.com Link: https://lkml.kernel.org/r/1510649563-22975-2-git-send-email-benjamin.gaignard@linaro.org
2017-11-13Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds9-113/+91
Pull timer updates from Thomas Gleixner: "Yet another big pile of changes: - More year 2038 work from Arnd slowly reaching the point where we need to think about the syscalls themself. - A new timer function which allows to conditionally (re)arm a timer only when it's either not running or the new expiry time is sooner than the armed expiry time. This allows to use a single timer for multiple timeout requirements w/o caring about the first expiry time at the call site. - A new NMI safe accessor to clock real time for the printk timestamp work. Can be used by tracing, perf as well if required. - A large number of timer setup conversions from Kees which got collected here because either maintainers requested so or they simply got ignored. As Kees pointed out already there are a few trivial merge conflicts and some redundant commits which was unavoidable due to the size of this conversion effort. - Avoid a redundant iteration in the timer wheel softirq processing. - Provide a mechanism to treat RTC implementations depending on their hardware properties, i.e. don't inflict the write at the 0.5 seconds boundary which originates from the PC CMOS RTC to all RTCs. No functional change as drivers need to be updated separately. - The usual small updates to core code clocksource drivers. Nothing really exciting" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (111 commits) timers: Add a function to start/reduce a timer pstore: Use ktime_get_real_fast_ns() instead of __getnstimeofday() timer: Prepare to change all DEFINE_TIMER() callbacks netfilter: ipvs: Convert timers to use timer_setup() scsi: qla2xxx: Convert timers to use timer_setup() block/aoe: discover_timer: Convert timers to use timer_setup() ide: Convert timers to use timer_setup() drbd: Convert timers to use timer_setup() mailbox: Convert timers to use timer_setup() crypto: Convert timers to use timer_setup() drivers/pcmcia: omap1: Fix error in automated timer conversion ARM: footbridge: Fix typo in timer conversion drivers/sgi-xp: Convert timers to use timer_setup() drivers/pcmcia: Convert timers to use timer_setup() drivers/memstick: Convert timers to use timer_setup() drivers/macintosh: Convert timers to use timer_setup() hwrng/xgene-rng: Convert timers to use timer_setup() auxdisplay: Convert timers to use timer_setup() sparc/led: Convert timers to use timer_setup() mips: ip22/32: Convert timers to use timer_setup() ...
2017-11-07Merge branch 'linus' into locking/core, to resolve conflictsIngo Molnar10-0/+10
Conflicts: include/linux/compiler-clang.h include/linux/compiler-gcc.h include/linux/compiler-intel.h include/uapi/linux/stddef.h Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-11-06arm64: Use physical counter for in-kernel reads when booted in EL2Christoffer Dall1-4/+8
Using the physical counter allows KVM to retain the offset between the virtual and physical counter as long as it is actively running a VCPU. As soon as a VCPU is released, another thread is scheduled or we start running userspace applications, we reset the offset to 0, so that userspace accessing the virtual timer can still read the virtual counter and get the same view of time as the kernel. This opens up potential improvements for KVM performance, but we have to make a few adjustments to preserve system consistency. Currently get_cycles() is hardwired to arch_counter_get_cntvct() on arm64, but as we move to using the physical timer for the in-kernel time-keeping on systems that boot in EL2, we should use the same counter for get_cycles() as for other in-kernel timekeeping operations. Similarly, implementations of arch_timer_set_next_event_phys() is modified to use the counter specific to the timer being programmed. VHE kernels or kernels continuing to use the virtual timer are unaffected. Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@linaro.org>
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