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Commit 07cc77e0 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
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Merge branch 'powercap' 

* powercap:
  powercap/rapl: track lead cpu per package
  powercap/rapl: add package reference per domain
  powercap/rapl: reduce ipi calls
  cpumask: export cpumask_any_but
parents e1fb19cb 323ee64a
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Showing with 115 additions and 106 deletions
drivers/powercap/intel_rapl.c
View file @ 07cc77e0
......@@ -133,6 +133,12 @@ struct rapl_domain_data {
unsigned long timestamp;
};
struct msrl_action {
u32 msr_no;
u64 clear_mask;
u64 set_mask;
int err;
};
#define DOMAIN_STATE_INACTIVE BIT(0)
#define DOMAIN_STATE_POWER_LIMIT_SET BIT(1)
......@@ -149,6 +155,7 @@ struct rapl_power_limit {
static const char pl1_name[] = "long_term";
static const char pl2_name[] = "short_term";
struct rapl_package;
struct rapl_domain {
const char *name;
enum rapl_domain_type id;
......@@ -159,7 +166,7 @@ struct rapl_domain {
u64 attr_map; /* track capabilities */
unsigned int state;
unsigned int domain_energy_unit;
int package_id;
struct rapl_package *rp;
};
#define power_zone_to_rapl_domain(_zone) \
container_of(_zone, struct rapl_domain, power_zone)
......@@ -184,6 +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 {
......@@ -231,10 +239,10 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
static int rapl_write_data_raw(struct rapl_domain *rd,
enum rapl_primitives prim,
unsigned long long value);
static u64 rapl_unit_xlate(struct rapl_domain *rd, int package,
static u64 rapl_unit_xlate(struct rapl_domain *rd,
enum unit_type type, u64 value,
int to_raw);
static void package_power_limit_irq_save(int package_id);
static void package_power_limit_irq_save(struct rapl_package *rp);
static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */
......@@ -260,20 +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)
{
......@@ -312,25 +306,19 @@ static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy)
{
struct rapl_domain *rd = power_zone_to_rapl_domain(pcd_dev);
*energy = rapl_unit_xlate(rd, 0, ENERGY_UNIT, ENERGY_STATUS_MASK, 0);
*energy = rapl_unit_xlate(rd, ENERGY_UNIT, ENERGY_STATUS_MASK, 0);
return 0;
}
static int release_zone(struct powercap_zone *power_zone)
{
struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
struct rapl_package *rp;
struct rapl_package *rp = rd->rp;
/* package zone is the last zone of a package, we can free
* memory here since all children has been unregistered.
*/
if (rd->id == RAPL_DOMAIN_PACKAGE) {
rp = find_package_by_id(rd->package_id);
if (!rp) {
dev_warn(&power_zone->dev, "no package id %s\n",
rd->name);
return -ENODEV;
}
kfree(rd);
rp->domains = NULL;
}
......@@ -432,11 +420,7 @@ static int set_power_limit(struct powercap_zone *power_zone, int id,
get_online_cpus();
rd = power_zone_to_rapl_domain(power_zone);
rp = find_package_by_id(rd->package_id);
if (!rp) {
ret = -ENODEV;
goto set_exit;
}
rp = rd->rp;
if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
dev_warn(&power_zone->dev, "%s locked by BIOS, monitoring only\n",
......@@ -456,7 +440,7 @@ static int set_power_limit(struct powercap_zone *power_zone, int id,
ret = -EINVAL;
}
if (!ret)
package_power_limit_irq_save(rd->package_id);
package_power_limit_irq_save(rp);
set_exit:
put_online_cpus();
return ret;
......@@ -655,24 +639,19 @@ static void rapl_init_domains(struct rapl_package *rp)
break;
}
if (mask) {
rd->package_id = rp->id;
rd->rp = rp;
rd++;
}
}
}
static u64 rapl_unit_xlate(struct rapl_domain *rd, int package,
enum unit_type type, u64 value,
int to_raw)
static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
u64 value, int to_raw)
{
u64 units = 1;
struct rapl_package *rp;
struct rapl_package *rp = rd->rp;
u64 scale = 1;
rp = find_package_by_id(package);
if (!rp)
return value;
switch (type) {
case POWER_UNIT:
units = rp->power_unit;
......@@ -769,10 +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->package_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) {
......@@ -793,42 +770,66 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
final = value & rp->mask;
final = final >> rp->shift;
if (xlate)
*data = rapl_unit_xlate(rd, rd->package_id, rp->unit, final, 0);
*data = rapl_unit_xlate(rd, rp->unit, final, 0);
else
*data = final;
return 0;
}
static int msrl_update_safe(u32 msr_no, u64 clear_mask, u64 set_mask)
{
int err;
u64 val;
err = rdmsrl_safe(msr_no, &val);
if (err)
goto out;
val &= ~clear_mask;
val |= set_mask;
err = wrmsrl_safe(msr_no, val);
out:
return err;
}
static void msrl_update_func(void *info)
{
struct msrl_action *ma = info;
ma->err = msrl_update_safe(ma->msr_no, ma->clear_mask, ma->set_mask);
}
/* Similar use of primitive info in the read counterpart */
static int rapl_write_data_raw(struct rapl_domain *rd,
enum rapl_primitives prim,
unsigned long long value)
{
u64 msr_val;
u32 msr;
struct rapl_primitive_info *rp = &rpi[prim];
int cpu;
u64 bits;
struct msrl_action ma;
int ret;
cpu = find_active_cpu_on_package(rd->package_id);
if (cpu < 0)
return cpu;
msr = rd->msrs[rp->id];
if (rdmsrl_safe_on_cpu(cpu, msr, &msr_val)) {
dev_dbg(&rd->power_zone.dev,
"failed to read msr 0x%x on cpu %d\n", msr, cpu);
return -EIO;
}
value = rapl_unit_xlate(rd, rd->package_id, rp->unit, value, 1);
msr_val &= ~rp->mask;
msr_val |= value << rp->shift;
if (wrmsrl_safe_on_cpu(cpu, msr, msr_val)) {
dev_dbg(&rd->power_zone.dev,
"failed to write msr 0x%x on cpu %d\n", msr, cpu);
return -EIO;
}
cpu = rd->rp->lead_cpu;
bits = rapl_unit_xlate(rd, rp->unit, value, 1);
bits |= bits << rp->shift;
memset(&ma, 0, sizeof(ma));
return 0;
ma.msr_no = rd->msrs[rp->id];
ma.clear_mask = rp->mask;
ma.set_mask = bits;
ret = smp_call_function_single(cpu, msrl_update_func, &ma, 1);
if (ret)
WARN_ON_ONCE(ret);
else
ret = ma.err;
return ret;
}
/*
......@@ -893,6 +894,21 @@ static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
return 0;
}
static void power_limit_irq_save_cpu(void *info)
{
u32 l, h = 0;
struct rapl_package *rp = (struct rapl_package *)info;
/* save the state of PLN irq mask bit before disabling it */
rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) {
rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE;
rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED;
}
l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
}
/* REVISIT:
* When package power limit is set artificially low by RAPL, LVT
......@@ -904,61 +920,40 @@ static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
* to do by adding an atomic notifier.
*/
static void package_power_limit_irq_save(int package_id)
static void package_power_limit_irq_save(struct rapl_package *rp)
{
u32 l, h = 0;
int cpu;
struct rapl_package *rp;
rp = find_package_by_id(package_id);
if (!rp)
return;
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
cpu = find_active_cpu_on_package(package_id);
if (cpu < 0)
return;
/* save the state of PLN irq mask bit before disabling it */
rdmsr_safe_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) {
rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE;
rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED;
}
l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
wrmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1);
}
/* restore per package power limit interrupt enable state */
static void package_power_limit_irq_restore(int package_id)
static void power_limit_irq_restore_cpu(void *info)
{
u32 l, h;
int cpu;
struct rapl_package *rp;
u32 l, h = 0;
struct rapl_package *rp = (struct rapl_package *)info;
rp = find_package_by_id(package_id);
if (!rp)
return;
rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE)
l |= PACKAGE_THERM_INT_PLN_ENABLE;
else
l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
}
cpu = find_active_cpu_on_package(package_id);
if (cpu < 0)
/* restore per package power limit interrupt enable state */
static void package_power_limit_irq_restore(struct rapl_package *rp)
{
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
/* irq enable state not saved, nothing to restore */
if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED))
return;
rdmsr_safe_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE)
l |= PACKAGE_THERM_INT_PLN_ENABLE;
else
l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
wrmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
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)
......@@ -1141,7 +1136,7 @@ static int rapl_unregister_powercap(void)
* hotplug lock held
*/
list_for_each_entry(rp, &rapl_packages, plist) {
package_power_limit_irq_restore(rp->id);
package_power_limit_irq_restore(rp);
for (rd = rp->domains; rd < rp->domains + rp->nr_domains;
rd++) {
......@@ -1392,7 +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)) {
......@@ -1448,6 +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)) {
......@@ -1480,6 +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) {
......@@ -1500,6 +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;
......
lib/cpumask.c
View file @ 07cc77e0
......@@ -41,6 +41,7 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
break;
return i;
}
EXPORT_SYMBOL(cpumask_any_but);
/* These are not inline because of header tangles. */
#ifdef CONFIG_CPUMASK_OFFSTACK
......
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