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lib: sbi_pmu: add callback for counter width
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>
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2 changed files with 11 additions and 0 deletions
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@ -41,6 +41,11 @@ struct sbi_pmu_device {
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bool (*fw_counter_match_code)(uint32_t counter_index,
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uint32_t event_idx_code);
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/**
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* Fetch the max width of this counter in number of bits.
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*/
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int (*fw_counter_width)(void);
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/**
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* Read value of custom firmware counter
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* Note: 0 <= counter_index < SBI_PMU_FW_CTR_MAX
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@ -761,6 +761,7 @@ unsigned long sbi_pmu_num_ctr(void)
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int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
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{
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int width;
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union sbi_pmu_ctr_info cinfo = {0};
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struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
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@ -782,6 +783,11 @@ int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
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cinfo.type = SBI_PMU_CTR_TYPE_FW;
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/* Firmware counters are always 64 bits wide */
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cinfo.width = 63;
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if (pmu_dev && pmu_dev->fw_counter_width) {
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width = pmu_dev->fw_counter_width();
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if (width)
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cinfo.width = width - 1;
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}
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}
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*ctr_info = cinfo.value;
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