github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-07 22:14:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

clocksource: arch_timer: make virtual counter access configurable

Browse Source 
Change-Id: Ibdb1fd768b748002b90bfc165612c12c8311f8a2
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Hackmann 2017-09-19 10:55:17 -07:00 committed by Amit Pundir
parent 5d2df434b3
commit b35b095ca1
2 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/clocksource/Kconfig
View File

@ -158,6 +158,14 @@ config ARM_ARCH_TIMER_EVTSTREAM
This must be disabled for hardware validation purposes to detect any
hardware anomalies of missing events.
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
select CLKSRC_OF if OF

5
drivers/clocksource/arm_arch_timer.c
View File

@ -333,7 +333,10 @@ static void arch_counter_set_user_access(void)
| ARCH_TIMER_USR_PCT_ACCESS_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_VCT_ACCESS))
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
else
cntkctl &= ~ARCH_TIMER_USR_VCT_ACCESS_EN;
arch_timer_set_cntkctl(cntkctl);
}