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lib: sbi_pmu: add callback for counter width

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This patch adds a callback to fetch the number of bits implemented for a
custom firmware counter. If the callback fails or is not implemented then
width defaults to 63.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Mayuresh Chitale 2023-03-09 18:43:51 +05:30 • committed by Anup Patel
parent 506144f398
commit 1fe8dc9955
2 changed files with 11 additions and 0 deletions
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5
include/sbi/sbi_pmu.h
View file

@ -41,6 +41,11 @@ struct sbi_pmu_device {
bool (*fw_counter_match_code)(uint32_t counter_index,
uint32_t event_idx_code);
/**
* Fetch the max width of this counter in number of bits.
*/
int (*fw_counter_width)(void);
/**
* Read value of custom firmware counter
* Note: 0 <= counter_index < SBI_PMU_FW_CTR_MAX

6
lib/sbi/sbi_pmu.c
View file

@ -761,6 +761,7 @@ unsigned long sbi_pmu_num_ctr(void)
int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
{
int width;
union sbi_pmu_ctr_info cinfo = {0};
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
@ -782,6 +783,11 @@ int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
cinfo.type = SBI_PMU_CTR_TYPE_FW;
/* Firmware counters are always 64 bits wide */
cinfo.width = 63;
if (pmu_dev && pmu_dev->fw_counter_width) {
width = pmu_dev->fw_counter_width();
if (width)
cinfo.width = width - 1;
}
}
*ctr_info = cinfo.value;