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RISC-V: Add a simple platform driver for RISC-V legacy perf

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The old RISC-V perf implementation allowed counting of only
cycle/instruction counters using perf. Restore that feature by implementing
a simple platform driver under a separate config to provide backward
compatibility. Any existing software stack will continue to work as it is.
However, it provides an easy way out in future where we can remove the
legacy driver.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Atish Patra
2022-02-18 16:46:55 -08:00
committed by Palmer Dabbelt
parent f5bfa23f57
commit 9b3e150e31
4 changed files with 159 additions and 0 deletions
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6
include/linux/perf/riscv_pmu.h
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@@ -22,6 +22,7 @@
#define RISCV_MAX_COUNTERS 64
#define RISCV_OP_UNSUPP (-EOPNOTSUPP)
#define RISCV_PMU_PDEV_NAME "riscv-pmu"
#define RISCV_PMU_LEGACY_PDEV_NAME "riscv-pmu-legacy"
#define RISCV_PMU_STOP_FLAG_RESET 1
@@ -58,6 +59,11 @@ unsigned long riscv_pmu_ctr_read_csr(unsigned long csr);
int riscv_pmu_event_set_period(struct perf_event *event);
uint64_t riscv_pmu_ctr_get_width_mask(struct perf_event *event);
u64 riscv_pmu_event_update(struct perf_event *event);
#ifdef CONFIG_RISCV_PMU_LEGACY
void riscv_pmu_legacy_skip_init(void);
#else
static inline void riscv_pmu_legacy_skip_init(void) {};
#endif
struct riscv_pmu *riscv_pmu_alloc(void);
#endif /* CONFIG_RISCV_PMU */