diff mbox series

[1/2,v2] cpufreq: intel_pstate: Add parameter to get guarantee frequency

Message ID f03c683e06109a00ef3e3ecdd068759dfb4ac0b7.1610338353.git.yu.c.chen@intel.com (mailing list archive)
State Superseded, archived
Headers show
Series Get percpu max freq via HWP MSR register | expand

Commit Message

Chen Yu Jan. 11, 2021, 7:43 a.m. UTC 
Add input parameter to receive guarantee pstate from intel_pstate_get_hwp_max()
for later use.

No functional change intended.

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
 drivers/cpufreq/intel_pstate.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

Comments

Rafael J. Wysocki Jan. 11, 2021, 12:44 p.m. UTC | #1 
On Mon, Jan 11, 2021 at 8:40 AM Chen Yu <yu.c.chen@intel.com> wrote:
>
> Add input parameter to receive guarantee pstate from intel_pstate_get_hwp_max()
> for later use.

I'm not a fan of this change, because the new argument will only be
needed in one place where intel_pstate_get_hwp_max() and it requires
adding redundant local vars and pointless updates elsewhere.

Besides, in intel_pstate_get_cpu_pstates() you can do something like
this after calling intel_pstate_get_hwp_max():

cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(READ_ONCE(cpu->hwp_cap_cached));
cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
Chen Yu Jan. 12, 2021, 3:29 a.m. UTC | #2 
On Mon, Jan 11, 2021 at 01:44:09PM +0100, Rafael J. Wysocki wrote:
> On Mon, Jan 11, 2021 at 8:40 AM Chen Yu <yu.c.chen@intel.com> wrote:
> >
> > Add input parameter to receive guarantee pstate from intel_pstate_get_hwp_max()
> > for later use.
> 
> I'm not a fan of this change, because the new argument will only be
> needed in one place where intel_pstate_get_hwp_max() and it requires
> adding redundant local vars and pointless updates elsewhere.
> 
> Besides, in intel_pstate_get_cpu_pstates() you can do something like
> this after calling intel_pstate_get_hwp_max():
> 
> cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(READ_ONCE(cpu->hwp_cap_cached));
> cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
Okay, will do in next version.

Thanks,
Chenyu
diff mbox series

Patch

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index eaf32ef7a030..bd3dd1be73ba 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -830,7 +830,7 @@  static struct freq_attr *hwp_cpufreq_attrs[] = {
 };
 
 static void intel_pstate_get_hwp_max(struct cpudata *cpu, int *phy_max,
-				     int *current_max)
+				     int *current_max, int *guar_max)
 {
 	u64 cap;
 
@@ -842,6 +842,7 @@  static void intel_pstate_get_hwp_max(struct cpudata *cpu, int *phy_max,
 		*current_max = HWP_HIGHEST_PERF(cap);
 
 	*phy_max = HWP_HIGHEST_PERF(cap);
+	*guar_max = HWP_GUARANTEED_PERF(cap);
 }
 
 static void intel_pstate_hwp_set(unsigned int cpu)
@@ -1205,7 +1206,7 @@  static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
 
 static void update_qos_request(enum freq_qos_req_type type)
 {
-	int max_state, turbo_max, freq, i, perf_pct;
+	int max_state, turbo_max, guar_state, freq, i, perf_pct;
 	struct freq_qos_request *req;
 	struct cpufreq_policy *policy;
 
@@ -1223,7 +1224,7 @@  static void update_qos_request(enum freq_qos_req_type type)
 			continue;
 
 		if (hwp_active)
-			intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
+			intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state, &guar_state);
 		else
 			turbo_max = cpu->pstate.turbo_pstate;
 
@@ -1731,9 +1732,9 @@  static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 	cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
 
 	if (hwp_active && !hwp_mode_bdw) {
-		unsigned int phy_max, current_max;
+		unsigned int phy_max, current_max, guar_state;
 
-		intel_pstate_get_hwp_max(cpu, &phy_max, &current_max);
+		intel_pstate_get_hwp_max(cpu, &phy_max, &current_max, &guar_state);
 		cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling;
 		cpu->pstate.turbo_pstate = phy_max;
 	} else {
@@ -2209,7 +2210,7 @@  static void intel_pstate_update_perf_limits(struct cpudata *cpu,
 					    unsigned int policy_max)
 {
 	int32_t max_policy_perf, min_policy_perf;
-	int max_state, turbo_max;
+	int max_state, turbo_max, guar_state;
 	int max_freq;
 
 	/*
@@ -2218,7 +2219,7 @@  static void intel_pstate_update_perf_limits(struct cpudata *cpu,
 	 * rather than pure ratios.
 	 */
 	if (hwp_active) {
-		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
+		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state, &guar_state);
 	} else {
 		max_state = global.no_turbo || global.turbo_disabled ?
 			cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
@@ -2331,9 +2332,9 @@  static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
 
 	update_turbo_state();
 	if (hwp_active) {
-		int max_state, turbo_max;
+		int max_state, turbo_max, guar_state;
 
-		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
+		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state, &guar_state);
 		max_freq = max_state * cpu->pstate.scaling;
 	} else {
 		max_freq = intel_pstate_get_max_freq(cpu);
@@ -2691,7 +2692,7 @@  static void intel_cpufreq_adjust_perf(unsigned int cpunum,
 
 static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
-	int max_state, turbo_max, min_freq, max_freq, ret;
+	int max_state, turbo_max, guar_state, min_freq, max_freq, ret;
 	struct freq_qos_request *req;
 	struct cpudata *cpu;
 	struct device *dev;
@@ -2719,7 +2720,7 @@  static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
 	if (hwp_active) {
 		u64 value;
 
-		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
+		intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state, &guar_state);
 		policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY_HWP;
 		rdmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, &value);
 		WRITE_ONCE(cpu->hwp_req_cached, value);