powerpc/perf: Add new power PMU flag "PPMU_P10_DD1" for power10 DD1

Add a new power PMU flag "PPMU_P10_DD1" which can be used to
conditionally add any code path for power10 DD1 processor version.
Also modify power10 PMU driver code to set this flag only for DD1,
based on the Processor Version Register (PVR) value.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201021085329.384535-1-maddy@linux.ibm.com

diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index f6acabb6c9be8081d8d5cba42b76fa1f88723dcf..3b7baba01c92df94578c41af503f9c4adc71a191 100644 (file)
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h
@@ -82,6 +82,7 @@ struct power_pmu {
 #define PPMU_ARCH_207S         0x00000080 /* PMC is architecture v2.07S */
 #define PPMU_NO_SIAR           0x00000100 /* Do not use SIAR */
 #define PPMU_ARCH_31           0x00000200 /* Has MMCR3, SIER2 and SIER3 */
+#define PPMU_P10_DD1           0x00000400 /* Is power10 DD1 processor version */
 
 /*
  * Values for flags to get_alternatives()

diff --git a/arch/powerpc/perf/power10-pmu.c b/arch/powerpc/perf/power10-pmu.c
index 9dbe8f9b89b4f262f2255708d5741630486ca2c9..a01e87f0b8d0aab8ffb5200c980e0f7f9d690f93 100644 (file)
--- a/arch/powerpc/perf/power10-pmu.c
+++ b/arch/powerpc/perf/power10-pmu.c
@@ -403,6 +403,7 @@ static struct power_pmu power10_pmu = {
 
 int init_power10_pmu(void)
 {
+       unsigned int pvr;
        int rc;
 
        /* Comes from cpu_specs[] */
@@ -410,6 +411,11 @@ int init_power10_pmu(void)
            strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power10"))
                return -ENODEV;
 
+       pvr = mfspr(SPRN_PVR);
+       /* Add the ppmu flag for power10 DD1 */
+       if ((PVR_CFG(pvr) == 1))
+               power10_pmu.flags |= PPMU_P10_DD1;
+
        /* Set the PERF_REG_EXTENDED_MASK here */
        PERF_REG_EXTENDED_MASK = PERF_REG_PMU_MASK_31;