SBI PMU Snapshot function optimizes the number of traps to higher privilege mode by leveraging a shared memory between the S/VS-mode and the M/HS mode. Add the definitions for that extension and new error codes.
Reviewed-by: Anup Patel anup@brainfault.org Acked-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Atish Patra atishp@rivosinc.com --- arch/riscv/include/asm/sbi.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index ef8311dafb91..dfa830f7d54b 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -132,6 +132,7 @@ enum sbi_ext_pmu_fid { SBI_EXT_PMU_COUNTER_STOP, SBI_EXT_PMU_COUNTER_FW_READ, SBI_EXT_PMU_COUNTER_FW_READ_HI, + SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, };
union sbi_pmu_ctr_info { @@ -148,6 +149,13 @@ union sbi_pmu_ctr_info { }; };
+/* Data structure to contain the pmu snapshot data */ +struct riscv_pmu_snapshot_data { + u64 ctr_overflow_mask; + u64 ctr_values[64]; + u64 reserved[447]; +}; + #define RISCV_PMU_RAW_EVENT_MASK GENMASK_ULL(47, 0) #define RISCV_PMU_RAW_EVENT_IDX 0x20000
@@ -244,9 +252,11 @@ enum sbi_pmu_ctr_type {
/* Flags defined for counter start function */ #define SBI_PMU_START_FLAG_SET_INIT_VALUE (1 << 0) +#define SBI_PMU_START_FLAG_INIT_FROM_SNAPSHOT BIT(1)
/* Flags defined for counter stop function */ #define SBI_PMU_STOP_FLAG_RESET (1 << 0) +#define SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT BIT(1)
enum sbi_ext_dbcn_fid { SBI_EXT_DBCN_CONSOLE_WRITE = 0, @@ -285,6 +295,7 @@ struct sbi_sta_struct { #define SBI_ERR_ALREADY_AVAILABLE -6 #define SBI_ERR_ALREADY_STARTED -7 #define SBI_ERR_ALREADY_STOPPED -8 +#define SBI_ERR_NO_SHMEM -9
extern unsigned long sbi_spec_version; struct sbiret {