| Message ID | 20240229010130.1380926-5-atishp@rivosinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest | expand |
On Wed, Feb 28, 2024 at 05:01:19PM -0800, Atish Patra wrote: > 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) A patch before this which changes all flags to use BIT() instead of shifts would be good, since otherwise the new flags are inconsistent. > +#define SBI_PMU_START_FLAG_INIT_FROM_SNAPSHOT BIT(1) This is named SBI_PMU_START_FLAG_INIT_SNAPSHOT in the spec. > > /* 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 { > -- > 2.34.1 > Thanks, drew
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 {