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x86/amd: Move amd_get_highest_perf() out of amd-pstate

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amd_pstate_get_highest_perf() is a helper used to get the highest perf
value on AMD systems.  It's used in amd-pstate as part of preferred
core handling, but applicable for acpi-cpufreq as well.

Move it out to cppc handling code as amd_get_highest_perf().

Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Mario Limonciello 2024-08-26 16:13:54 -05:00
parent 21fb59ab4b
commit 2819bfef64
3 changed files with 37 additions and 32 deletions
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30
arch/x86/kernel/acpi/cppc.c
View File

@ -116,6 +116,36 @@ void init_freq_invariance_cppc(void)
mutex_unlock(&freq_invariance_lock);
}
/*
* Get the highest performance register value.
* @cpu: CPU from which to get highest performance.
* @highest_perf: Return address for highest performance value.
*
* Return: 0 for success, negative error code otherwise.
*/
int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
{
u64 val;
int ret;
if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
ret = rdmsrl_safe_on_cpu(cpu, MSR_AMD_CPPC_CAP1, &val);
if (ret)
goto out;
val = AMD_CPPC_HIGHEST_PERF(val);
} else {
ret = cppc_get_highest_perf(cpu, &val);
if (ret)
goto out;
}
WRITE_ONCE(*highest_perf, (u32)val);
out:
return ret;
}
EXPORT_SYMBOL_GPL(amd_get_highest_perf);
/**
* amd_get_boost_ratio_numerator: Get the numerator to use for boost ratio calculation
* @cpu: CPU to get numerator for.

34
drivers/cpufreq/amd-pstate.c
View File

@ -811,36 +811,6 @@ static void amd_pstste_sched_prefcore_workfn(struct work_struct *work)
}
static DECLARE_WORK(sched_prefcore_work, amd_pstste_sched_prefcore_workfn);
/*
* Get the highest performance register value.
* @cpu: CPU from which to get highest performance.
* @highest_perf: Return address.
*
* Return: 0 for success, -EIO otherwise.
*/
static int amd_pstate_get_highest_perf(int cpu, u32 *highest_perf)
{
int ret;
if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
u64 cap1;
ret = rdmsrl_safe_on_cpu(cpu, MSR_AMD_CPPC_CAP1, &cap1);
if (ret)
return ret;
WRITE_ONCE(*highest_perf, AMD_CPPC_HIGHEST_PERF(cap1));
} else {
u64 cppc_highest_perf;
ret = cppc_get_highest_perf(cpu, &cppc_highest_perf);
if (ret)
return ret;
WRITE_ONCE(*highest_perf, cppc_highest_perf);
}
return (ret);
}
#define CPPC_MAX_PERF U8_MAX
static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
@ -848,7 +818,7 @@ static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
int ret, prio;
u32 highest_perf;
ret = amd_pstate_get_highest_perf(cpudata->cpu, &highest_perf);
ret = amd_get_highest_perf(cpudata->cpu, &highest_perf);
if (ret)
return;
@ -892,7 +862,7 @@ static void amd_pstate_update_limits(unsigned int cpu)
if ((!amd_pstate_prefcore) || (!cpudata->hw_prefcore))
goto free_cpufreq_put;
ret = amd_pstate_get_highest_perf(cpu, &cur_high);
ret = amd_get_highest_perf(cpu, &cur_high);
if (ret)
goto free_cpufreq_put;

5
include/acpi/cppc_acpi.h
View File

@ -159,6 +159,7 @@ 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);
extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps);
extern int cppc_set_auto_sel(int cpu, bool enable);
extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator);
#else /* !CONFIG_ACPI_CPPC_LIB */
static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
@ -233,6 +234,10 @@ static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf
{
return -EOPNOTSUPP;
}
static inline int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
{
return -ENODEV;
}
static inline int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator)
{
return -EOPNOTSUPP;