[v3 04/15] powerpc/perf: Add support for ISA3.1 PMU SPRs
Jordan Niethe
jniethe5 at gmail.com
Wed Jul 22 20:52:56 AEST 2020
On Wed, Jul 22, 2020 at 6:07 PM Athira Rajeev
<atrajeev at linux.vnet.ibm.com> wrote:
>
>
>
> On 22-Jul-2020, at 9:48 AM, Jordan Niethe <jniethe5 at gmail.com> wrote:
>
> On Sat, Jul 18, 2020 at 1:02 AM Athira Rajeev
> <atrajeev at linux.vnet.ibm.com> wrote:
>
>
> From: Madhavan Srinivasan <maddy at linux.ibm.com>
>
> PowerISA v3.1 includes new performance monitoring unit(PMU)
> special purpose registers (SPRs). They are
>
> Monitor Mode Control Register 3 (MMCR3)
> Sampled Instruction Event Register 2 (SIER2)
> Sampled Instruction Event Register 3 (SIER3)
>
> MMCR3 is added for further sampling related configuration
> control. SIER2/SIER3 are added to provide additional
> information about the sampled instruction.
>
> Patch adds new PPMU flag called "PPMU_ARCH_310S" to support
> handling of these new SPRs, updates the struct thread_struct
> to include these new SPRs, include MMCR3 in struct mmcr_regs.
> This is needed to support programming of MMCR3 SPR during
> event_[enable/disable]. Patch also adds the sysfs support
> for the MMCR3 SPR along with SPRN_ macros for these new pmu sprs.
>
> Signed-off-by: Madhavan Srinivasan <maddy at linux.ibm.com>
> ---
> arch/powerpc/include/asm/perf_event_server.h | 2 ++
> arch/powerpc/include/asm/processor.h | 4 ++++
> arch/powerpc/include/asm/reg.h | 6 ++++++
> arch/powerpc/kernel/sysfs.c | 8 ++++++++
> arch/powerpc/perf/core-book3s.c | 29 ++++++++++++++++++++++++++++
> 5 files changed, 49 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
> index 14b8dc1..832450a 100644
> --- a/arch/powerpc/include/asm/perf_event_server.h
> +++ b/arch/powerpc/include/asm/perf_event_server.h
> @@ -22,6 +22,7 @@ struct mmcr_regs {
> unsigned long mmcr1;
> unsigned long mmcr2;
> unsigned long mmcra;
> + unsigned long mmcr3;
> };
> /*
> * This struct provides the constants and functions needed to
> @@ -75,6 +76,7 @@ struct power_pmu {
> #define PPMU_HAS_SIER 0x00000040 /* Has SIER */
> #define PPMU_ARCH_207S 0x00000080 /* PMC is architecture v2.07S */
> #define PPMU_NO_SIAR 0x00000100 /* Do not use SIAR */
> +#define PPMU_ARCH_310S 0x00000200 /* Has MMCR3, SIER2 and SIER3 */
>
> We elsewhere have CPU_FTR_ARCH_31, so should this be PPMU_ARCH_31S to
> be consistent.
>
>
>
> Ok,
> This change will need to be done in all places which are currently using PPMU_ARCH_310S
>
> /*
> * Values for flags to get_alternatives()
> diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
> index 52a6783..a466e94 100644
> --- a/arch/powerpc/include/asm/processor.h
> +++ b/arch/powerpc/include/asm/processor.h
> @@ -272,6 +272,10 @@ struct thread_struct {
> unsigned mmcr0;
>
> unsigned used_ebb;
> + unsigned long mmcr3;
> + unsigned long sier2;
> + unsigned long sier3;
> +
> #endif
> };
>
> diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
> index 88e6c78..21a1b2d 100644
> --- a/arch/powerpc/include/asm/reg.h
> +++ b/arch/powerpc/include/asm/reg.h
> @@ -876,7 +876,9 @@
> #define MMCR0_FCHV 0x00000001UL /* freeze conditions in hypervisor mode */
> #define SPRN_MMCR1 798
> #define SPRN_MMCR2 785
> +#define SPRN_MMCR3 754
> #define SPRN_UMMCR2 769
> +#define SPRN_UMMCR3 738
> #define SPRN_MMCRA 0x312
> #define MMCRA_SDSYNC 0x80000000UL /* SDAR synced with SIAR */
> #define MMCRA_SDAR_DCACHE_MISS 0x40000000UL
> @@ -918,6 +920,10 @@
> #define SIER_SIHV 0x1000000 /* Sampled MSR_HV */
> #define SIER_SIAR_VALID 0x0400000 /* SIAR contents valid */
> #define SIER_SDAR_VALID 0x0200000 /* SDAR contents valid */
> +#define SPRN_SIER2 752
> +#define SPRN_SIER3 753
> +#define SPRN_USIER2 736
> +#define SPRN_USIER3 737
> #define SPRN_SIAR 796
> #define SPRN_SDAR 797
> #define SPRN_TACR 888
> diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
> index 571b325..46b4ebc 100644
> --- a/arch/powerpc/kernel/sysfs.c
> +++ b/arch/powerpc/kernel/sysfs.c
> @@ -622,8 +622,10 @@ void ppc_enable_pmcs(void)
> SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
>
> SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
> +SYSFS_PMCSETUP(mmcr3, SPRN_MMCR3);
>
> static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
> +static DEVICE_ATTR(mmcr3, 0600, show_mmcr3, store_mmcr3);
> #endif /* HAS_PPC_PMC56 */
>
>
> @@ -886,6 +888,9 @@ static int register_cpu_online(unsigned int cpu)
> #ifdef CONFIG_PMU_SYSFS
> if (cpu_has_feature(CPU_FTR_MMCRA))
> device_create_file(s, &dev_attr_mmcra);
> +
> + if (cpu_has_feature(CPU_FTR_ARCH_31))
> + device_create_file(s, &dev_attr_mmcr3);
> #endif /* CONFIG_PMU_SYSFS */
>
> if (cpu_has_feature(CPU_FTR_PURR)) {
> @@ -980,6 +985,9 @@ static int unregister_cpu_online(unsigned int cpu)
> #ifdef CONFIG_PMU_SYSFS
> if (cpu_has_feature(CPU_FTR_MMCRA))
> device_remove_file(s, &dev_attr_mmcra);
> +
> + if (cpu_has_feature(CPU_FTR_ARCH_31))
> + device_remove_file(s, &dev_attr_mmcr3);
> #endif /* CONFIG_PMU_SYSFS */
>
> if (cpu_has_feature(CPU_FTR_PURR)) {
> diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
> index f4d07b5..ca32fc0 100644
> --- a/arch/powerpc/perf/core-book3s.c
> +++ b/arch/powerpc/perf/core-book3s.c
> @@ -72,6 +72,11 @@ struct cpu_hw_events {
> /*
> * 32-bit doesn't have MMCRA but does have an MMCR2,
> * and a few other names are different.
> + * Also 32-bit doesn't have MMCR3, SIER2 and SIER3.
> + * Define them as zero knowing that any code path accessing
> + * these registers (via mtspr/mfspr) are done under ppmu flag
> + * check for PPMU_ARCH_310S and we will not enter that code path
> + * for 32-bit.
> */
> #ifdef CONFIG_PPC32
>
> @@ -85,6 +90,9 @@ struct cpu_hw_events {
> #define MMCR0_PMCC_U6 0
>
> #define SPRN_MMCRA SPRN_MMCR2
> +#define SPRN_MMCR3 0
> +#define SPRN_SIER2 0
> +#define SPRN_SIER3 0
> #define MMCRA_SAMPLE_ENABLE 0
>
> static inline unsigned long perf_ip_adjust(struct pt_regs *regs)
> @@ -581,6 +589,11 @@ static void ebb_switch_out(unsigned long mmcr0)
> current->thread.sdar = mfspr(SPRN_SDAR);
> current->thread.mmcr0 = mmcr0 & MMCR0_USER_MASK;
> current->thread.mmcr2 = mfspr(SPRN_MMCR2) & MMCR2_USER_MASK;
> + if (ppmu->flags & PPMU_ARCH_310S) {
> + current->thread.mmcr3 = mfspr(SPRN_MMCR3);
>
> Like MMCR0_USER_MASK and MMCR2_USER_MASK do we need a MMCR3_USER_MASK
> here, or is there no need?
>
>
> Jordan
>
> We don’t need user mask for MMCR3 and other new SPRs ( SIER2/3) . Incase of MMCR3, we dont have any Freeze control bits and incase of SIER2/3, it is similar to SIER (where HW handles the masking of the bits), hence we didn't add any user_mask for these SPRs
Okay thank you for explaining that.
>
> Thanks
> Athira
>
> + current->thread.sier2 = mfspr(SPRN_SIER2);
> + current->thread.sier3 = mfspr(SPRN_SIER3);
> + }
> }
>
> static unsigned long ebb_switch_in(bool ebb, struct cpu_hw_events *cpuhw)
> @@ -620,6 +633,12 @@ static unsigned long ebb_switch_in(bool ebb, struct cpu_hw_events *cpuhw)
> * instead manage the MMCR2 entirely by itself.
> */
> mtspr(SPRN_MMCR2, cpuhw->mmcr.mmcr2 | current->thread.mmcr2);
> +
> + if (ppmu->flags & PPMU_ARCH_310S) {
> + mtspr(SPRN_MMCR3, current->thread.mmcr3);
> + mtspr(SPRN_SIER2, current->thread.sier2);
> + mtspr(SPRN_SIER3, current->thread.sier3);
> + }
> out:
> return mmcr0;
> }
> @@ -840,6 +859,11 @@ void perf_event_print_debug(void)
> pr_info("EBBRR: %016lx BESCR: %016lx\n",
> mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR));
> }
> +
> + if (ppmu->flags & PPMU_ARCH_310S) {
> + pr_info("MMCR3: %016lx SIER2: %016lx SIER3: %016lx\n",
> + mfspr(SPRN_MMCR3), mfspr(SPRN_SIER2), mfspr(SPRN_SIER3));
> + }
> #endif
> pr_info("SIAR: %016lx SDAR: %016lx SIER: %016lx\n",
> mfspr(SPRN_SIAR), sdar, sier);
> @@ -1305,6 +1329,8 @@ static void power_pmu_enable(struct pmu *pmu)
> if (!cpuhw->n_added) {
> mtspr(SPRN_MMCRA, cpuhw->mmcr.mmcra & ~MMCRA_SAMPLE_ENABLE);
> mtspr(SPRN_MMCR1, cpuhw->mmcr.mmcr1);
> + if (ppmu->flags & PPMU_ARCH_310S)
> + mtspr(SPRN_MMCR3, cpuhw->mmcr.mmcr3);
> goto out_enable;
> }
>
> @@ -1348,6 +1374,9 @@ static void power_pmu_enable(struct pmu *pmu)
> if (ppmu->flags & PPMU_ARCH_207S)
> mtspr(SPRN_MMCR2, cpuhw->mmcr.mmcr2);
>
> + if (ppmu->flags & PPMU_ARCH_310S)
> + mtspr(SPRN_MMCR3, cpuhw->mmcr.mmcr3);
> +
> /*
> * Read off any pre-existing events that need to move
> * to another PMC.
> --
> 1.8.3.1
>
>
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