From 1fe8dc995566d869836d3caf37e427c28536f453 Mon Sep 17 00:00:00 2001 From: Mayuresh Chitale Date: Thu, 9 Mar 2023 18:43:51 +0530 Subject: 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 Reviewed-by: Atish Patra Reviewed-by: Anup Patel --- include/sbi/sbi_pmu.h | 5 +++++ lib/sbi/sbi_pmu.c | 6 ++++++ 2 files changed, 11 insertions(+) diff --git a/include/sbi/sbi_pmu.h b/include/sbi/sbi_pmu.h index c365243..b3b75c1 100644 --- a/include/sbi/sbi_pmu.h +++ b/include/sbi/sbi_pmu.h @@ -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 diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c index 154dbda..a99c045 100644 --- a/lib/sbi/sbi_pmu.c +++ b/lib/sbi/sbi_pmu.c @@ -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; -- cgit v1.2.3