4 files changed, 45 insertions, 5 deletions

diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index 1a8093fa8f71..078019b5b353 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h
@@ -47,6 +47,8 @@ struct power_pmu {
  */
 #define PPMU_LIMITED_PMC5_6     1       /* PMC5/6 have limited function */
 #define PPMU_ALT_SIPR           2       /* uses alternate posn for SIPR/HV */
+#define PPMU_NO_SIPR            4       /* no SIPR/HV in MMCRA at all */
+#define PPMU_NO_CONT_SAMPLING   8       /* no continuous sampling */
 
 /*
  * Values for flags to get_alternatives()
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index c2e27ede07ec..02aee03e713c 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -116,14 +116,45 @@ static inline void perf_get_data_addr(struct pt_regs *regs, u64 *addrp)
                 *addrp = mfspr(SPRN_SDAR);
 }
 
+static inline u32 perf_flags_from_msr(struct pt_regs *regs)
+{
+        if (regs->msr & MSR_PR)
+                return PERF_RECORD_MISC_USER;
+        if ((regs->msr & MSR_HV) && freeze_events_kernel != MMCR0_FCHV)
+                return PERF_RECORD_MISC_HYPERVISOR;
+        return PERF_RECORD_MISC_KERNEL;
+}
+
 static inline u32 perf_get_misc_flags(struct pt_regs *regs)
 {
         unsigned long mmcra = regs->dsisr;
         unsigned long sihv = MMCRA_SIHV;
         unsigned long sipr = MMCRA_SIPR;
 
+        /* Not a PMU interrupt: Make up flags from regs->msr */
         if (TRAP(regs) != 0xf00)
-                return 0;       /* not a PMU interrupt */
+                return perf_flags_from_msr(regs);
+
+        /*
+         * If we don't support continuous sampling and this
+         * is not a marked event, same deal
+         */
+        if ((ppmu->flags & PPMU_NO_CONT_SAMPLING) &&
+            !(mmcra & MMCRA_SAMPLE_ENABLE))
+                return perf_flags_from_msr(regs);
+
+        /*
+         * If we don't have flags in MMCRA, rather than using
+         * the MSR, we intuit the flags from the address in
+         * SIAR which should give slightly more reliable
+         * results
+         */
+        if (ppmu->flags & PPMU_NO_SIPR) {
+                unsigned long siar = mfspr(SPRN_SIAR);
+                if (siar >= PAGE_OFFSET)
+                        return PERF_RECORD_MISC_KERNEL;
+                return PERF_RECORD_MISC_USER;
+        }
 
         if (ppmu->flags & PPMU_ALT_SIPR) {
                 sihv = POWER6_MMCRA_SIHV;
@@ -1299,13 +1330,18 @@ unsigned long perf_misc_flags(struct pt_regs *regs)
  */
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
-        unsigned long ip;
+        unsigned long mmcra = regs->dsisr;
 
+        /* Not a PMU interrupt */
         if (TRAP(regs) != 0xf00)
-                return regs->nip;       /* not a PMU interrupt */
+                return regs->nip;
+
+        /* Processor doesn't support sampling non marked events */
+        if ((ppmu->flags & PPMU_NO_CONT_SAMPLING) &&
+            !(mmcra & MMCRA_SAMPLE_ENABLE))
+                return regs->nip;
 
-        ip = mfspr(SPRN_SIAR) + perf_ip_adjust(regs);
-        return ip;
+        return mfspr(SPRN_SIAR) + perf_ip_adjust(regs);
 }
 
 static bool pmc_overflow(unsigned long val)
diff --git a/arch/powerpc/perf/power4-pmu.c b/arch/powerpc/perf/power4-pmu.c
index b4f1dda4d089..9103a1de864d 100644
--- a/arch/powerpc/perf/power4-pmu.c
+++ b/arch/powerpc/perf/power4-pmu.c
@@ -607,6 +607,7 @@ static struct power_pmu power4_pmu = {
         .n_generic              = ARRAY_SIZE(p4_generic_events),
         .generic_events         = p4_generic_events,
         .cache_events           = &power4_cache_events,
+        .flags                  = PPMU_NO_SIPR | PPMU_NO_CONT_SAMPLING,
 };
 
 static int __init init_power4_pmu(void)
diff --git a/arch/powerpc/perf/ppc970-pmu.c b/arch/powerpc/perf/ppc970-pmu.c
index 111eb25bb0b6..20139ceeacf6 100644
--- a/arch/powerpc/perf/ppc970-pmu.c
+++ b/arch/powerpc/perf/ppc970-pmu.c
@@ -487,6 +487,7 @@ static struct power_pmu ppc970_pmu = {
         .n_generic              = ARRAY_SIZE(ppc970_generic_events),
         .generic_events         = ppc970_generic_events,
         .cache_events           = &ppc970_cache_events,
+        .flags                  = PPMU_NO_SIPR | PPMU_NO_CONT_SAMPLING,
 };
 
 static int __init init_ppc970_pmu(void)