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lib: sbi: Detect and print MHPM counters at boot-time

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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>
This commit is contained in:
Anup Patel
2020-08-19 17:31:37 +05:30
committed by Anup Patel
parent 74d1db7062
commit 2c341f7844
3 changed files with 19 additions and 0 deletions
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17
lib/sbi/sbi_hart.c
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@@ -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