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Commit ecf58d04 authored by Greg Hackmann's avatar Greg Hackmann Committed by Shadab Naseem
Browse files

clocksource: arch_timer: make virtual counter access configurable 



Add a config option to support virtual counter access from userspace.

Change-Id: Ibdb1fd768b748002b90bfc165612c12c8311f8a2
Signed-off-by: default avatarGreg Hackmann <ghackmann@google.com>
Signed-off-by: default avatarVenkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Signed-off-by: default avatarNeeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: default avatarCong Zhang <congzhan@codeaurora.org>
parent 42a3bb39

drivers/clocksource/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -376,6 +376,14 @@ config SUN50I_ERRATUM_UNKNOWN1 
	  the Allwinner A64 SoC. The workaround will only be active if the

	  allwinner,erratum-unknown1 property is found in the timer node.



config ARM_ARCH_TIMER_VCT_ACCESS

	bool "Support for ARM architected timer virtual counter access in userspace"

	default !ARM64

	depends on ARM_ARCH_TIMER

	help

	  This option enables support for reading the ARM architected timer's

	  virtual counter in userspace.



config ARM_GLOBAL_TIMER

	bool "Support for the ARM global timer" if COMPILE_TEST

	select TIMER_OF if OF

drivers/clocksource/arm_arch_timer.c

+2 −1
Original line number Diff line number Diff line
@@ -871,7 +871,8 @@ static void arch_counter_set_user_access(void) 
	 * need to be workaround. The vdso may have been already

	 * disabled though.

	 */

	if (arch_timer_this_cpu_has_cntvct_wa())

	if (arch_timer_this_cpu_has_cntvct_wa() ||

	    !IS_ENABLED(CONFIG_ARM_ARCH_TIMER_VCT_ACCESS))

		pr_info("CPU%d: Trapping CNTVCT access\n", smp_processor_id());

	else

		cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;