From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mayuresh Chitale Date: Thu, 9 Mar 2023 11:21:05 +0530 Subject: [PATCH v3 1/8] lib: sbi_pmu: add callback for counter width In-Reply-To: <20230309055112.1516581-1-mchitale@ventanamicro.com> References: <20230309055112.1516581-1-mchitale@ventanamicro.com> Message-ID: <20230309055112.1516581-2-mchitale@ventanamicro.com> List-Id: To: opensbi@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 --- 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; -- 2.34.1