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perf: riscv: Fix selecting counters in legacy mode

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[ Upstream commit 941a8e9b7a ]

It is required to check event type before checking event config.
Events with the different types can have the same config.
This check is missed for legacy mode code

For such perf usage:
    sysctl -w kernel.perf_user_access=2
    perf stat -e cycles,L1-dcache-loads --
driver will try to force both events to CYCLE counter.

This commit implements event type check before forcing
events on the special counters.

Signed-off-by: Shifrin Dmitry <dmitry.shifrin@syntacore.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Fixes: cc4c07c89a ("drivers: perf: Implement perf event mmap support in the SBI backend")
Link: https://lore.kernel.org/r/20240729125858.630653-1-dmitry.shifrin@syntacore.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shifrin Dmitry 2024-07-29 15:58:58 +03:00 committed by Greg Kroah-Hartman
parent 10b26868bf
commit fa12277fa2
1 changed files with 1 additions and 1 deletions
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drivers/perf/riscv_pmu_sbi.c
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@ -355,7 +355,7 @@ static int pmu_sbi_ctr_get_idx(struct perf_event *event)
* but not in the user access mode as we want to use the other counters * but not in the user access mode as we want to use the other counters
* that support sampling/filtering. * that support sampling/filtering.
*/ */
if (hwc->flags & PERF_EVENT_FLAG_LEGACY) { if ((hwc->flags & PERF_EVENT_FLAG_LEGACY) && (event->attr.type == PERF_TYPE_HARDWARE)) {
if (event->attr.config == PERF_COUNT_HW_CPU_CYCLES) { if (event->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
cflags |= SBI_PMU_CFG_FLAG_SKIP_MATCH; cflags |= SBI_PMU_CFG_FLAG_SKIP_MATCH;
cmask = 1; cmask = 1;