linux/drivers/clocksource/arm_arch_timer.c, branch v5.9

arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040

2020-07-08T20:57:51Z

ARM64_WORKAROUND_1418040 requires that AArch32 EL0 accesses to the virtual counter register are trapped and emulated by the kernel. This makes the vdso pretty pointless, and in some cases livelock prone. Provide a workaround entry that limits the vdso to 64bit tasks. Signed-off-by: Marc Zyngier Acked-by: Mark Rutland Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200706163802.1836732-4-maz@kernel.org Signed-off-by: Will Deacon

arm64: arch_timer: Allow an workaround descriptor to disable compat vdso

2020-07-08T20:57:51Z

As we are about to disable the vdso for compat tasks in some circumstances, let's allow a workaround descriptor to express exactly that. Signed-off-by: Marc Zyngier Acked-by: Mark Rutland Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200706163802.1836732-3-maz@kernel.org Signed-off-by: Will Deacon

Merge branch 'timers/drivers/timer-ti' into timers/drivers/next

2020-05-22T22:01:13Z

drivers/clocksource/arm_arch_timer: Remove duplicate error message

2020-05-22T21:58:56Z

The function acpi_gtdt_init() prints a message in case of error. Remove the error message after testing if the function fails, otherwise it is a duplicate message. Signed-off-by: Dejin Zheng Signed-off-by: Daniel Lezcano Link: https://lore.kernel.org/r/20200429153559.21189-1-zhengdejin5@gmail.com

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2020-03-31T17:05:01Z

Pull arm64 updates from Catalin Marinas: "The bulk is in-kernel pointer authentication, activity monitors and lots of asm symbol annotations. I also queued the sys_mremap() patch commenting the asymmetry in the address untagging. Summary: - In-kernel Pointer Authentication support (previously only offered to user space). - ARM Activity Monitors (AMU) extension support allowing better CPU utilisation numbers for the scheduler (frequency invariance). - Memory hot-remove support for arm64. - Lots of asm annotations (SYM_*) in preparation for the in-kernel Branch Target Identification (BTI) support. - arm64 perf updates: ARMv8.5-PMU 64-bit counters, refactoring the PMU init callbacks, support for new DT compatibles. - IPv6 header checksum optimisation. - Fixes: SDEI (software delegated exception interface) double-lock on hibernate with shared events. - Minor clean-ups and refactoring: cpu_ops accessor, cpu_do_switch_mm() converted to C, cpufeature finalisation helper. - sys_mremap() comment explaining the asymmetric address untagging behaviour" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (81 commits) mm/mremap: Add comment explaining the untagging behaviour of mremap() arm64: head: Convert install_el2_stub to SYM_INNER_LABEL arm64: Introduce get_cpu_ops() helper function arm64: Rename cpu_read_ops() to init_cpu_ops() arm64: Declare ACPI parking protocol CPU operation if needed arm64: move kimage_vaddr to .rodata arm64: use mov_q instead of literal ldr arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH lkdtm: arm64: test kernel pointer authentication arm64: compile the kernel with ptrauth return address signing kconfig: Add support for 'as-option' arm64: suspend: restore the kernel ptrauth keys arm64: __show_regs: strip PAC from lr in printk arm64: unwind: strip PAC from kernel addresses arm64: mask PAC bits of __builtin_return_address arm64: initialize ptrauth keys for kernel booting task arm64: initialize and switch ptrauth kernel keys arm64: enable ptrauth earlier arm64: cpufeature: handle conflicts based on capability arm64: cpufeature: Move cpu capability helpers inside C file ...

clocksource/drivers/arm_arch_timer: validate arch_timer_rate

2020-03-06T16:02:51Z

Using an arch timer with a frequency of less than 1MHz can potentially result in incorrect functionality in systems that assume a reasonable rate of the arch timer of 1 to 50MHz, described as typical in the architecture specification. Therefore, warn if the arch timer rate is below 1MHz, which is considered atypical and worth emphasizing. Suggested-by: Valentin Schneider Signed-off-by: Ionela Voinescu Acked-by: Marc Zyngier Cc: Marc Zyngier Cc: Mark Rutland Signed-off-by: Catalin Marinas

clocksource/drivers/arm_arch_timer: Fix vDSO clockmode when vDSO disabled

2020-02-25T21:08:39Z

The arm_arch_timer requires VDSO_CLOCKMODE_ARCHTIMER to be defined to compile correctly. On ARM the vDSO can be disabled and when this is the case the compilation ends prematurely with an error: $ make ARCH=arm multi_v7_defconfig $ ./scripts/config -d VDSO $ make drivers/clocksource/arm_arch_timer.c:73:44: error: ‘VDSO_CLOCKMODE_ARCHTIMER’ undeclared here (not in a function) static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_ARCHTIMER; Make the usage of VDSO_CLOCKMODE_ARCHTIMER depend on the VDSO enablement and initialize the vdso clockmode variable with VDSO_CLOCKMODE_NONE otherwise. [ tglx: Match changelog and patch content. ] Fixes: 5e3c6a312a09 ("ARM/arm64: vdso: Use common vdso clock mode storage") Reported-by: Marek Szyprowski Signed-off-by: Vincenzo Frascino Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200224151552.57274-1-vincenzo.frascino@arm.com

ARM/arm64: vdso: Use common vdso clock mode storage

2020-02-17T19:12:16Z

Convert ARM/ARM64 to the generic VDSO clock mode storage. This needs to happen in one go as they share the clocksource driver. Signed-off-by: Thomas Gleixner Tested-by: Vincenzo Frascino Reviewed-by: Vincenzo Frascino Link: https://lkml.kernel.org/r/20200207124403.363235229@linutronix.de

Merge branch 'timers/vdso' into timers/core

2019-07-03T08:50:21Z

so the hyper-v clocksource update can be applied.

clocksource/drivers/arm_arch_timer: Extract elf_hwcap use to arch-helper

2019-06-25T17:49:18Z

Different mechanisms are used to test and set elf_hwcaps between ARM and ARM64, this results in the use of ifdeferry in this file when setting/testing for the EVTSTRM hwcap. Let's improve readability by extracting this to an arch helper. Signed-off-by: Andrew Murray Acked-by: Mark Rutland Acked-by: Will Deacon Signed-off-by: Daniel Lezcano