On Tue, Apr 19, 2016 at 11:54:20AM -0700, Ashok Kumar wrote:
> changed pmu register access to make use of <read/write>_sys_reg
> from sysreg.h instead of accessing them directly.
>
> Signed-off-by: Ashok Kumar <ashoks@xxxxxxxxxxxx>
> ---
> arch/arm64/kernel/perf_event.c | 33 ++++++++++++++++-----------------
> 1 file changed, 16 insertions(+), 17 deletions(-)
>
> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
> index 2ee61e8..86790d2 100644
> --- a/arch/arm64/kernel/perf_event.c
> +++ b/arch/arm64/kernel/perf_event.c
> @@ -22,6 +22,7 @@
> #include <asm/irq_regs.h>
> #include <asm/perf_event.h>
> #include <asm/virt.h>
> +#include <asm/sysreg.h>
Please move this between the includes of <asm/perf_event.h> and
<asm/virt.h>, so as to keep them in alphabetical order.
Otherwise, this looks like a nice cleanup!
With that fixed up:
Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
Mark.
>
> #include <linux/of.h>
> #include <linux/perf/arm_pmu.h>
> @@ -476,16 +477,14 @@ static const struct attribute_group *armv8_pmuv3_attr_groups[] = {
>
> static inline u32 armv8pmu_pmcr_read(void)
> {
> - u32 val;
> - asm volatile("mrs %0, pmcr_el0" : "=r" (val));
> - return val;
> + return read_sysreg(pmcr_el0);
> }
>
> static inline void armv8pmu_pmcr_write(u32 val)
> {
> val &= ARMV8_PMU_PMCR_MASK;
> isb();
> - asm volatile("msr pmcr_el0, %0" :: "r" (val));
> + write_sysreg(val, pmcr_el0);
> }
>
> static inline int armv8pmu_has_overflowed(u32 pmovsr)
> @@ -507,7 +506,7 @@ static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
> static inline int armv8pmu_select_counter(int idx)
> {
> u32 counter = ARMV8_IDX_TO_COUNTER(idx);
> - asm volatile("msr pmselr_el0, %0" :: "r" (counter));
> + write_sysreg(counter, pmselr_el0);
> isb();
>
> return idx;
> @@ -524,9 +523,9 @@ static inline u32 armv8pmu_read_counter(struct perf_event *event)
> pr_err("CPU%u reading wrong counter %d\n",
> smp_processor_id(), idx);
> else if (idx == ARMV8_IDX_CYCLE_COUNTER)
> - asm volatile("mrs %0, pmccntr_el0" : "=r" (value));
> + value = read_sysreg(pmccntr_el0);
> else if (armv8pmu_select_counter(idx) == idx)
> - asm volatile("mrs %0, pmxevcntr_el0" : "=r" (value));
> + value = read_sysreg(pmxevcntr_el0);
>
> return value;
> }
> @@ -548,47 +547,47 @@ static inline void armv8pmu_write_counter(struct perf_event *event, u32 value)
> */
> u64 value64 = 0xffffffff00000000ULL | value;
>
> - asm volatile("msr pmccntr_el0, %0" :: "r" (value64));
> + write_sysreg(value64, pmccntr_el0);
> } else if (armv8pmu_select_counter(idx) == idx)
> - asm volatile("msr pmxevcntr_el0, %0" :: "r" (value));
> + write_sysreg(value, pmxevcntr_el0);
> }
>
> static inline void armv8pmu_write_evtype(int idx, u32 val)
> {
> if (armv8pmu_select_counter(idx) == idx) {
> val &= ARMV8_PMU_EVTYPE_MASK;
> - asm volatile("msr pmxevtyper_el0, %0" :: "r" (val));
> + write_sysreg(val, pmxevtyper_el0);
> }
> }
>
> static inline int armv8pmu_enable_counter(int idx)
> {
> u32 counter = ARMV8_IDX_TO_COUNTER(idx);
> - asm volatile("msr pmcntenset_el0, %0" :: "r" (BIT(counter)));
> + write_sysreg(BIT(counter), pmcntenset_el0);
> return idx;
> }
>
> static inline int armv8pmu_disable_counter(int idx)
> {
> u32 counter = ARMV8_IDX_TO_COUNTER(idx);
> - asm volatile("msr pmcntenclr_el0, %0" :: "r" (BIT(counter)));
> + write_sysreg(BIT(counter), pmcntenclr_el0);
> return idx;
> }
>
> static inline int armv8pmu_enable_intens(int idx)
> {
> u32 counter = ARMV8_IDX_TO_COUNTER(idx);
> - asm volatile("msr pmintenset_el1, %0" :: "r" (BIT(counter)));
> + write_sysreg(BIT(counter), pmintenset_el1);
> return idx;
> }
>
> static inline int armv8pmu_disable_intens(int idx)
> {
> u32 counter = ARMV8_IDX_TO_COUNTER(idx);
> - asm volatile("msr pmintenclr_el1, %0" :: "r" (BIT(counter)));
> + write_sysreg(BIT(counter), pmintenclr_el1);
> isb();
> /* Clear the overflow flag in case an interrupt is pending. */
> - asm volatile("msr pmovsclr_el0, %0" :: "r" (BIT(counter)));
> + write_sysreg(BIT(counter), pmovsclr_el0);
> isb();
>
> return idx;
> @@ -599,11 +598,11 @@ static inline u32 armv8pmu_getreset_flags(void)
> u32 value;
>
> /* Read */
> - asm volatile("mrs %0, pmovsclr_el0" : "=r" (value));
> + value = read_sysreg(pmovsclr_el0);
>
> /* Write to clear flags */
> value &= ARMV8_PMU_OVSR_MASK;
> - asm volatile("msr pmovsclr_el0, %0" :: "r" (value));
> + write_sysreg(value, pmovsclr_el0);
>
> return value;
> }
> --
> 2.1.0
>
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