diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-08-19 17:31:37 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-09-01 10:28:31 +0530 |
| commit | 2c341f7844f439017c9aab42ae92e919c3b98253 (patch) | |
| tree | e1140a8dca11b40b895cd70c58bc052d6e9722f2 /lib/sbi/sbi_hart.c | |
| parent | 74d1db706293f42f5a4e87c907978339b2d0993d (diff) | |
lib: sbi: Detect and print MHPM counters at boot-time
A RISC-V platform can leave unimplemented MHPM counters hard-wired
to zero. We extend hart_detect_features() to detect MHPM counters
which are accessible and not hard-wired to zero. We also print
number of available MHPM counters as part of boot prints.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib/sbi/sbi_hart.c')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index 8f31d58..2211c3c 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -28,6 +28,7 @@ void (*sbi_hart_expected_trap)(void) = &__sbi_expected_trap; struct hart_features { unsigned long features; unsigned int pmp_count; + unsigned int mhpm_count; }; static unsigned long hart_features_offset; @@ -135,6 +136,14 @@ void sbi_hart_delegation_dump(struct sbi_scratch *scratch) #endif } +unsigned int sbi_hart_mhpm_count(struct sbi_scratch *scratch) +{ + struct hart_features *hfeatures = + sbi_scratch_offset_ptr(scratch, hart_features_offset); + + return hfeatures->mhpm_count; +} + unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch) { struct hart_features *hfeatures = @@ -339,6 +348,7 @@ static void hart_detect_features(struct sbi_scratch *scratch) hfeatures = sbi_scratch_offset_ptr(scratch, hart_features_offset); hfeatures->features = 0; hfeatures->pmp_count = 0; + hfeatures->mhpm_count = 0; #define __check_csr(__csr, __rdonly, __wrval, __field, __skip) \ val = csr_read_allowed(__csr, (ulong)&trap); \ @@ -382,6 +392,13 @@ static void hart_detect_features(struct sbi_scratch *scratch) __check_csr_64(CSR_PMPADDR0, 0, PMP_ADDR_MASK, pmp_count, __pmp_skip); __pmp_skip: + /* Detect number of MHPM counters */ + __check_csr(CSR_MHPMCOUNTER3, 0, 1UL, mhpm_count, __mhpm_skip); + __check_csr_4(CSR_MHPMCOUNTER4, 0, 1UL, mhpm_count, __mhpm_skip); + __check_csr_8(CSR_MHPMCOUNTER8, 0, 1UL, mhpm_count, __mhpm_skip); + __check_csr_16(CSR_MHPMCOUNTER16, 0, 1UL, mhpm_count, __mhpm_skip); +__mhpm_skip: + #undef __check_csr_64 #undef __check_csr_32 #undef __check_csr_16 |