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riscv: Prepare for user-space perf event mmap support

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Provide all the necessary bits in the generic riscv pmu driver to be
able to mmap perf events in userspace: the heavy lifting lies in the
driver backend, namely the legacy and sbi implementations.

Note that arch_perf_update_userpage is almost a copy of arm64 code.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Alexandre Ghiti
2023-08-02 10:03:23 +02:00
committed by Palmer Dabbelt
parent d5ac062d82
commit 83c5e13b8c
2 changed files with 109 additions and 0 deletions
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4
include/linux/perf/riscv_pmu.h
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@@ -55,6 +55,10 @@ struct riscv_pmu {
void (*ctr_start)(struct perf_event *event, u64 init_val);
void (*ctr_stop)(struct perf_event *event, unsigned long flag);
int (*event_map)(struct perf_event *event, u64 *config);
void (*event_init)(struct perf_event *event);
void (*event_mapped)(struct perf_event *event, struct mm_struct *mm);
void (*event_unmapped)(struct perf_event *event, struct mm_struct *mm);
uint8_t (*csr_index)(struct perf_event *event);
struct cpu_hw_events __percpu *hw_events;
struct hlist_node node;