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| author | Athira Rajeev <atrajeev@linux.vnet.ibm.com> | 2020-11-26 19:54:44 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 17:01:29 +0300 |
| commit | 91668ab7db4bcfae332e561df1de2401f3f18553 (patch) | |
| tree | 1e7f7b45b14dd24c50d393613416d14e169e6b46 /arch/powerpc/perf/core-book3s.c | |
| parent | 9a8ee52634235993273c43ef67669d8168497dd7 (diff) | |
| download | linux-91668ab7db4bcfae332e561df1de2401f3f18553.tar.xz | |
powerpc/perf: MMCR0 control for PMU registers under PMCC=00
PowerISA v3.1 introduces new control bit (PMCCEXT) for restricting
access to group B PMU registers in problem state when
MMCR0 PMCC=0b00. In problem state and when MMCR0 PMCC=0b00,
setting the Monitor Mode Control Register bit 54 (MMCR0 PMCCEXT),
will restrict read permission on Group B Performance Monitor
Registers (SIER, SIAR, SDAR and MMCR1). When this bit is set to zero,
group B registers will be readable. In other platforms (like power9),
the older behaviour is retained where group B PMU SPRs are readable.
Patch adds support for MMCR0 PMCCEXT bit in power10 by enabling
this bit during boot and during the PMU event enable/disable callback
functions.
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1606409684-1589-8-git-send-email-atrajeev@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/perf/core-book3s.c')
| -rw-r--r-- | arch/powerpc/perf/core-book3s.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 6e224650b3c9..c0e5ea3d6b25 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -95,6 +95,7 @@ static unsigned int freeze_events_kernel = MMCR0_FCS; #define SPRN_SIER3 0 #define MMCRA_SAMPLE_ENABLE 0 #define MMCRA_BHRB_DISABLE 0 +#define MMCR0_PMCCEXT 0 static inline unsigned long perf_ip_adjust(struct pt_regs *regs) { @@ -1273,6 +1274,9 @@ static void power_pmu_disable(struct pmu *pmu) val |= MMCR0_FC; val &= ~(MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC | MMCR0_PMAO | MMCR0_FC56); + /* Set mmcr0 PMCCEXT for p10 */ + if (ppmu->flags & PPMU_ARCH_31) + val |= MMCR0_PMCCEXT; /* * The barrier is to make sure the mtspr has been |