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Date: Wed, 11 Jan 2017 04:12:16 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [RFC][Update][PATCH 1/2] cpufreq: intel_pstate: Expose global sysfs attributes upfront
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Expose the intel_pstate's global sysfs attributes before registering
the driver to prepare for the addition of an attribute that also will
have to work if the driver is not registered.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/cpufreq/intel_pstate.c | 68 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 66 insertions(+), 2 deletions(-)
Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -358,6 +358,8 @@ static struct pstate_funcs pstate_funcs
static int hwp_active __read_mostly;
static bool per_cpu_limits __read_mostly;
+static bool driver_registered __read_mostly;
+
#ifdef CONFIG_ACPI
static bool acpi_ppc;
#endif
@@ -394,6 +396,7 @@ static struct perf_limits *limits = &per
static struct perf_limits *limits = &powersave_limits;
#endif
+static DEFINE_MUTEX(intel_pstate_driver_lock);
static DEFINE_MUTEX(intel_pstate_limits_lock);
#ifdef CONFIG_ACPI
@@ -1055,12 +1058,22 @@ static ssize_t show_turbo_pct(struct kob
int total, no_turbo, turbo_pct;
uint32_t turbo_fp;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
turbo_fp = div_fp(no_turbo, total);
turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
+
+ mutex_unlock(&intel_pstate_driver_lock);
+
return sprintf(buf, "%u\n", turbo_pct);
}
@@ -1070,8 +1083,18 @@ static ssize_t show_num_pstates(struct k
struct cpudata *cpu;
int total;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
+
+ mutex_unlock(&intel_pstate_driver_lock);
+
return sprintf(buf, "%u\n", total);
}
@@ -1080,12 +1103,21 @@ static ssize_t show_no_turbo(struct kobj
{
ssize_t ret;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
update_turbo_state();
if (limits->turbo_disabled)
ret = sprintf(buf, "%u\n", limits->turbo_disabled);
else
ret = sprintf(buf, "%u\n", limits->no_turbo);
+ mutex_unlock(&intel_pstate_driver_lock);
+
return ret;
}
@@ -1099,12 +1131,20 @@ static ssize_t store_no_turbo(struct kob
if (ret != 1)
return -EINVAL;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
mutex_lock(&intel_pstate_limits_lock);
update_turbo_state();
if (limits->turbo_disabled) {
pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
mutex_unlock(&intel_pstate_limits_lock);
+ mutex_unlock(&intel_pstate_driver_lock);
return -EPERM;
}
@@ -1114,6 +1154,8 @@ static ssize_t store_no_turbo(struct kob
intel_pstate_update_policies();
+ mutex_unlock(&intel_pstate_driver_lock);
+
return count;
}
@@ -1127,6 +1169,13 @@ static ssize_t store_max_perf_pct(struct
if (ret != 1)
return -EINVAL;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
mutex_lock(&intel_pstate_limits_lock);
limits->max_sysfs_pct = clamp_t(int, input, 0 , 100);
@@ -1142,6 +1191,8 @@ static ssize_t store_max_perf_pct(struct
intel_pstate_update_policies();
+ mutex_unlock(&intel_pstate_driver_lock);
+
return count;
}
@@ -1155,6 +1206,13 @@ static ssize_t store_min_perf_pct(struct
if (ret != 1)
return -EINVAL;
+ mutex_lock(&intel_pstate_driver_lock);
+
+ if (!driver_registered) {
+ mutex_unlock(&intel_pstate_driver_lock);
+ return -EAGAIN;
+ }
+
mutex_lock(&intel_pstate_limits_lock);
limits->min_sysfs_pct = clamp_t(int, input, 0 , 100);
@@ -1170,6 +1228,8 @@ static ssize_t store_min_perf_pct(struct
intel_pstate_update_policies();
+ mutex_unlock(&intel_pstate_driver_lock);
+
return count;
}
@@ -2489,16 +2549,20 @@ hwp_cpu_matched:
intel_pstate_request_control_from_smm();
+ intel_pstate_sysfs_expose_params();
+
rc = cpufreq_register_driver(intel_pstate_driver);
if (rc)
goto out;
+ mutex_lock(&intel_pstate_driver_lock);
+ driver_registered = true;
+ mutex_unlock(&intel_pstate_driver_lock);
+
if (intel_pstate_driver == &intel_pstate && !hwp_active &&
pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load)
intel_pstate_debug_expose_params();
- intel_pstate_sysfs_expose_params();
-
if (hwp_active)
pr_info("HWP enabled\n");
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