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tools: lib: perf: Implement riscv mmap support

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riscv now supports mmaping hardware counters so add what's needed to
take advantage of that in libperf.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Ian Rogers <irogers@google.com>
This commit is contained in:
Alexandre Ghiti 2023-08-02 10:03:27 +02:00 committed by Palmer Dabbelt
parent 57972127b2
commit 60bd501164
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GPG key ID: 2E1319F35FBB1889
1 changed files with 66 additions and 0 deletions
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66
tools/lib/perf/mmap.c
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@ -392,6 +392,72 @@ static u64 read_perf_counter(unsigned int counter)
static u64 read_timestamp(void) { return read_sysreg(cntvct_el0); }
/* __riscv_xlen contains the witdh of the native base integer, here 64-bit */
#elif defined(__riscv) && __riscv_xlen == 64
/* TODO: implement rv32 support */
#define CSR_CYCLE 0xc00
#define CSR_TIME 0xc01
#define csr_read(csr) \
({ \
register unsigned long __v; \
__asm__ __volatile__ ("csrr %0, %1" \
: "=r" (__v) \
: "i" (csr) : ); \
__v; \
})
static unsigned long csr_read_num(int csr_num)
{
#define switchcase_csr_read(__csr_num, __val) {\
case __csr_num: \
__val = csr_read(__csr_num); \
break; }
#define switchcase_csr_read_2(__csr_num, __val) {\
switchcase_csr_read(__csr_num + 0, __val) \
switchcase_csr_read(__csr_num + 1, __val)}
#define switchcase_csr_read_4(__csr_num, __val) {\
switchcase_csr_read_2(__csr_num + 0, __val) \
switchcase_csr_read_2(__csr_num + 2, __val)}
#define switchcase_csr_read_8(__csr_num, __val) {\
switchcase_csr_read_4(__csr_num + 0, __val) \
switchcase_csr_read_4(__csr_num + 4, __val)}
#define switchcase_csr_read_16(__csr_num, __val) {\
switchcase_csr_read_8(__csr_num + 0, __val) \
switchcase_csr_read_8(__csr_num + 8, __val)}
#define switchcase_csr_read_32(__csr_num, __val) {\
switchcase_csr_read_16(__csr_num + 0, __val) \
switchcase_csr_read_16(__csr_num + 16, __val)}
unsigned long ret = 0;
switch (csr_num) {
switchcase_csr_read_32(CSR_CYCLE, ret)
default:
break;
}
return ret;
#undef switchcase_csr_read_32
#undef switchcase_csr_read_16
#undef switchcase_csr_read_8
#undef switchcase_csr_read_4
#undef switchcase_csr_read_2
#undef switchcase_csr_read
}
static u64 read_perf_counter(unsigned int counter)
{
return csr_read_num(CSR_CYCLE + counter);
}
static u64 read_timestamp(void)
{
return csr_read_num(CSR_TIME);
}
#else
static u64 read_perf_counter(unsigned int counter __maybe_unused) { return 0; }
static u64 read_timestamp(void) { return 0; }