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lib: sbi_pmu: Simplify FW counters to reduce memory usage

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Currently, we have 32 elements (i.e. SBI_PMU_FW_EVENT_MAX) array of
"struct sbi_pmu_fw_event" for each of 128 possible HARTs
(i.e. SBI_HARTMASK_MAX_BITS).

To reduce memory usage of OpenSBI, we update FW counter implementation
as follows:
1) Remove SBI_PMU_FW_EVENT_MAX
2) Remove "struct sbi_pmu_fw_event"
3) Create per-HART bitmap of XLEN bits to track FW counters
   which are started on each HART
4) Create per-HART uint64_t array to track values of FW
   counters on each HART.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2022-08-24 13:27:19 +05:30
committed by Anup Patel
parent e238459fab
commit c9b388d578
2 changed files with 36 additions and 45 deletions
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3
include/sbi/sbi_pmu.h
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@@ -19,9 +19,6 @@
/* Maximum number of hardware events that can mapped by OpenSBI */
#define SBI_PMU_HW_EVENT_MAX 256
/* Maximum number of firmware events that can mapped by OpenSBI */
#define SBI_PMU_FW_EVENT_MAX 32
/* Counter related macros */
#define SBI_PMU_FW_CTR_MAX 16
#define SBI_PMU_HW_CTR_MAX 32