Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

lib: sbi_pmu: Add PMU snapshot definitions

Browse Source 
OpenSBI doesn't support SBI PMU snapshot yet as there is not much benefit
unless the multiple counters overflow at the same time.

Just add the definition and return not supported error at this moment. The
default returned error is also not supported. Thus, no functional change
intended.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Atish Patra
2023-12-07 14:23:49 -08:00
committed by Anup Patel
parent 93da66b7d4
commit ee725174ba
4 changed files with 14 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/sbi/sbi_ecall_interface.h
View File

@@ -103,6 +103,7 @@
#define SBI_EXT_PMU_COUNTER_STOP 0x4
#define SBI_EXT_PMU_COUNTER_FW_READ 0x5
#define SBI_EXT_PMU_COUNTER_FW_READ_HI 0x6
#define SBI_EXT_PMU_SNAPSHOT_SET_SHMEM 0x7
/** General pmu event codes specified in SBI PMU extension */
enum sbi_pmu_hw_generic_events_t {
@@ -241,9 +242,11 @@ 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 (1 << 1)
/* Flags defined for counter stop function */
#define SBI_PMU_STOP_FLAG_RESET (1 << 0)
#define SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT (1 << 1)
/* SBI function IDs for DBCN extension */
#define SBI_EXT_DBCN_CONSOLE_WRITE 0x0
@@ -309,8 +312,9 @@ enum sbi_cppc_reg_id {
#define SBI_ERR_ALREADY_AVAILABLE -6
#define SBI_ERR_ALREADY_STARTED -7
#define SBI_ERR_ALREADY_STOPPED -8
#define SBI_ERR_NO_SHMEM -9
#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
#define SBI_LAST_ERR SBI_ERR_NO_SHMEM
/* clang-format on */

1
include/sbi/sbi_error.h
View File

@@ -23,6 +23,7 @@
#define SBI_EALREADY SBI_ERR_ALREADY_AVAILABLE
#define SBI_EALREADY_STARTED SBI_ERR_ALREADY_STARTED
#define SBI_EALREADY_STOPPED SBI_ERR_ALREADY_STOPPED
#define SBI_ENO_SHMEM SBI_ERR_NO_SHMEM
#define SBI_ENODEV -1000
#define SBI_ENOSYS -1001

2
lib/sbi/sbi_ecall_pmu.c
View File

@@ -74,6 +74,8 @@ static int sbi_ecall_pmu_handler(unsigned long extid, unsigned long funcid,
case SBI_EXT_PMU_COUNTER_STOP:
ret = sbi_pmu_ctr_stop(regs->a0, regs->a1, regs->a2);
break;
case SBI_EXT_PMU_SNAPSHOT_SET_SHMEM:
/* fallthrough as OpenSBI doesn't support snapshot yet */
default:
ret = SBI_ENOTSUPP;
}

6
lib/sbi/sbi_pmu.c
View File

@@ -442,6 +442,9 @@ int sbi_pmu_ctr_start(unsigned long cbase, unsigned long cmask,
if ((cbase + sbi_fls(cmask)) >= total_ctrs)
return ret;
if (flags & SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT)
return SBI_ENO_SHMEM;
if (flags & SBI_PMU_START_FLAG_SET_INIT_VALUE)
bUpdate = true;
@@ -540,6 +543,9 @@ int sbi_pmu_ctr_stop(unsigned long cbase, unsigned long cmask,
if ((cbase + sbi_fls(cmask)) >= total_ctrs)
return SBI_EINVAL;
if (flag & SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT)
return SBI_ENO_SHMEM;
for_each_set_bit(i, &cmask, BITS_PER_LONG) {
cidx = i + cbase;
event_idx_type = pmu_ctr_validate(phs, cidx, &event_code);