diff options
| author | Pengjie Zhang <zhangpengjie2@huawei.com> | 2026-07-08 16:28:17 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-07-22 20:01:23 +0000 |
| commit | 9aa7df52052399f7759b70f64c6ee561f901a28a (patch) | |
| tree | 39fbabbe00ef4666f237d2e7e9c203470a8de0eb /include | |
| parent | a13c140cc289c0b7b3770bce5b3ad42ab35074aa (diff) | |
ACPI: CPPC: add paired FFH feedback-counter read hook
cppc_get_perf_ctrs() reads the delivered and reference performance
counters one at a time.
Allow architectures to provide both FFH feedback counters in one
operation when that either narrows the sampling window or avoids extra
cross-CPU reads. Add a small FFH-specific hook for that case and fall
back to the existing per-register reads when unsupported.
Tested-by: Sumit Gupta <sumitg@nvidia.com>
Reviewed-by: Sumit Gupta <sumitg@nvidia.com>
Tested-by: Vanshidhar Konda <vanshikonda@os.amperecomputing.com>
Reviewed-by: Vanshidhar Konda <vanshikonda@os.amperecomputing.com>
Signed-off-by: Pengjie Zhang <zhangpengjie2@huawei.com>
Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/acpi/cppc_acpi.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 8693890a7275..5acebe62feac 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -176,6 +176,8 @@ extern int cppc_get_transition_latency(int cpu); extern bool cpc_ffh_supported(void); extern bool cpc_supported_by_cpu(void); extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val); +extern int cpc_read_ffh_fb_ctrs(int cpu, struct cpc_reg *reg1, u64 *val1, + struct cpc_reg *reg2, u64 *val2); extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val); extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf); extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable); @@ -250,6 +252,11 @@ static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val) { return -EOPNOTSUPP; } +static inline int cpc_read_ffh_fb_ctrs(int cpu, struct cpc_reg *reg1, u64 *val1, + struct cpc_reg *reg2, u64 *val2) +{ + return -EOPNOTSUPP; +} static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val) { return -EOPNOTSUPP; |