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cpufreq: intel_pstate: Adjust frequency percentage computations

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Adjust frequency percentage computations in update_cpu_qos_request() to
avoid going above the exact numerical percentage in the FREQ_QOS_MAX
case.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
Link: https://patch.msgid.link/3395556.44csPzL39Z@rafael.j.wysocki
[ rjw: Rename "cpu" to "cpudata" and "cpunum" to "cpu" ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2025-09-05 15:53:54 +02:00
parent f1bbf5bbf2
commit ae1bdd23b9
1 changed files with 3 additions and 5 deletions
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8
drivers/cpufreq/intel_pstate.c
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@@ -1655,8 +1655,8 @@ static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
static void update_cpu_qos_request(int cpu, enum freq_qos_req_type type) static void update_cpu_qos_request(int cpu, enum freq_qos_req_type type)
{ {
struct cpudata *cpudata = all_cpu_data[cpu]; struct cpudata *cpudata = all_cpu_data[cpu];
unsigned int freq = cpudata->pstate.turbo_freq;
struct freq_qos_request *req; struct freq_qos_request *req;
unsigned int freq, perf_pct;
struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpu); struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpu);
if (!policy) if (!policy)
@@ -1670,14 +1670,12 @@ static void update_cpu_qos_request(int cpu, enum freq_qos_req_type type)
intel_pstate_get_hwp_cap(cpudata); intel_pstate_get_hwp_cap(cpudata);
if (type == FREQ_QOS_MIN) { if (type == FREQ_QOS_MIN) {
perf_pct = global.min_perf_pct; freq = DIV_ROUND_UP(freq * global.min_perf_pct, 100);
} else { } else {
req++; req++;
perf_pct = global.max_perf_pct; freq = (freq * global.max_perf_pct) / 100;
} }
freq = DIV_ROUND_UP(cpudata->pstate.turbo_freq * perf_pct, 100);
if (freq_qos_update_request(req, freq) < 0) if (freq_qos_update_request(req, freq) < 0)
pr_warn("Failed to update freq constraint: CPU%d\n", cpu); pr_warn("Failed to update freq constraint: CPU%d\n", cpu);
} }