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Diffstat (limited to 'drivers/powercap/intel_rapl.c')
-rw-r--r--drivers/powercap/intel_rapl.c59
1 files changed, 20 insertions, 39 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 3413692c4dde..cdfd01f0adb8 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -191,6 +191,7 @@ struct rapl_package {
* notify interrupt enable status.
*/
struct list_head plist;
+ int lead_cpu; /* one active cpu per package for access */
};
struct rapl_defaults {
@@ -267,20 +268,6 @@ static struct rapl_package *find_package_by_id(int id)
return NULL;
}
-/* caller to ensure CPU hotplug lock is held */
-static int find_active_cpu_on_package(int package_id)
-{
- int i;
-
- for_each_online_cpu(i) {
- if (topology_physical_package_id(i) == package_id)
- return i;
- }
- /* all CPUs on this package are offline */
-
- return -ENODEV;
-}
-
/* caller must hold cpu hotplug lock */
static void rapl_cleanup_data(void)
{
@@ -761,10 +748,8 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
msr = rd->msrs[rp->id];
if (!msr)
return -EINVAL;
- /* use physical package id to look up active cpus */
- cpu = find_active_cpu_on_package(rd->rp->id);
- if (cpu < 0)
- return cpu;
+
+ cpu = rd->rp->lead_cpu;
/* special-case package domain, which uses a different bit*/
if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) {
@@ -829,10 +814,7 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
struct msrl_action ma;
int ret;
- cpu = find_active_cpu_on_package(rd->rp->id);
- if (cpu < 0)
- return cpu;
-
+ cpu = rd->rp->lead_cpu;
bits = rapl_unit_xlate(rd, rp->unit, value, 1);
bits |= bits << rp->shift;
memset(&ma, 0, sizeof(ma));
@@ -940,18 +922,10 @@ static void power_limit_irq_save_cpu(void *info)
static void package_power_limit_irq_save(struct rapl_package *rp)
{
- int cpu;
-
- if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
- return;
-
- cpu = find_active_cpu_on_package(rp->id);
- if (cpu < 0)
- return;
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
- smp_call_function_single(cpu, power_limit_irq_save_cpu, rp, 1);
+ smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1);
}
static void power_limit_irq_restore_cpu(void *info)
@@ -972,20 +946,14 @@ static void power_limit_irq_restore_cpu(void *info)
/* restore per package power limit interrupt enable state */
static void package_power_limit_irq_restore(struct rapl_package *rp)
{
- int cpu;
-
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
- cpu = find_active_cpu_on_package(rp->id);
- if (cpu < 0)
- return;
-
/* irq enable state not saved, nothing to restore */
if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED))
return;
- smp_call_function_single(cpu, power_limit_irq_restore_cpu, rp, 1);
+ smp_call_function_single(rp->lead_cpu, power_limit_irq_restore_cpu, rp, 1);
}
static void set_floor_freq_default(struct rapl_domain *rd, bool mode)
@@ -1419,7 +1387,8 @@ static int rapl_detect_topology(void)
/* add the new package to the list */
new_package->id = phy_package_id;
new_package->nr_cpus = 1;
-
+ /* use the first active cpu of the package to access */
+ new_package->lead_cpu = i;
/* check if the package contains valid domains */
if (rapl_detect_domains(new_package, i) ||
rapl_defaults->check_unit(new_package, i)) {
@@ -1475,6 +1444,8 @@ static int rapl_add_package(int cpu)
/* add the new package to the list */
rp->id = phy_package_id;
rp->nr_cpus = 1;
+ rp->lead_cpu = cpu;
+
/* check if the package contains valid domains */
if (rapl_detect_domains(rp, cpu) ||
rapl_defaults->check_unit(rp, cpu)) {
@@ -1507,6 +1478,7 @@ static int rapl_cpu_callback(struct notifier_block *nfb,
unsigned long cpu = (unsigned long)hcpu;
int phy_package_id;
struct rapl_package *rp;
+ int lead_cpu;
phy_package_id = topology_physical_package_id(cpu);
switch (action) {
@@ -1527,6 +1499,15 @@ static int rapl_cpu_callback(struct notifier_block *nfb,
break;
if (--rp->nr_cpus == 0)
rapl_remove_package(rp);
+ else if (cpu == rp->lead_cpu) {
+ /* choose another active cpu in the package */
+ lead_cpu = cpumask_any_but(topology_core_cpumask(cpu), cpu);
+ if (lead_cpu < nr_cpu_ids)
+ rp->lead_cpu = lead_cpu;
+ else /* should never go here */
+ pr_err("no active cpu available for package %d\n",
+ phy_package_id);
+ }
}
return NOTIFY_OK;