[PATCH 12/15] powercap/intel_rapl: Make cpu optional for rapl_package
From: Zhang Rui
Date: Thu Mar 16 2023 - 11:43:55 EST
MSR RAPL Interface always removes a rapl_package when all the CPUs in
that rapl_package are offlined. This is because it relies on an online
CPU to access the MSR.
But for RAPL Interface using MMIO registers, when all the cpus within
the rapl_package are offlined,
1. the register can still be accessed
2. monitoring and setting the Power Pimits for the rapl_package is still
meaningful because of uncore power.
This means that, a valid rapl_package doesn't rely on one or more cpus
being onlined.
For this sense, make cpu optional for rapl_package. A rapl_package can
be registered either using a CPU id to represent the physical
package/die, or using the physical package id directly.
Note that, the thermal throttling interrupt is not disabled via
MSR_IA32_PACKAGE_THERM_INTERRUPT for such rapl_package at the moment.
If it is still needed in the future, this can be achieved by selecting
an onlined CPU using the physical package id.
Note that, processor_thermal_rapl, the current MMIO RAPL Interface
driver can be converted to register with a package id instead. This is
not done because processor_thermal_rapl driver works on single-package
systems only, and offlining the only package will not happen. So keep
the previous logic.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/powercap/intel_rapl_common.c | 84 +++++++++++--------
drivers/powercap/intel_rapl_msr.c | 6 +-
.../int340x_thermal/processor_thermal_rapl.c | 6 +-
include/linux/intel_rapl.h | 8 +-
4 files changed, 60 insertions(+), 44 deletions(-)
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index 27ebc2c51803..a6a7d048d0b4 100644
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -523,6 +523,12 @@ static const struct powercap_zone_constraint_ops constraint_ops = {
.get_name = get_constraint_name,
};
+/* Return the id used for read_raw/write_raw callback */
+static int get_rid(struct rapl_package *rp)
+{
+ return rp->lead_cpu >= 0 ? rp->lead_cpu : rp->id;
+}
+
/* called after domain detection and package level data are set */
static void rapl_init_domains(struct rapl_package *rp)
{
@@ -541,10 +547,12 @@ static void rapl_init_domains(struct rapl_package *rp)
if (i == RAPL_DOMAIN_PLATFORM && rp->id > 0) {
snprintf(rd->name, RAPL_DOMAIN_NAME_LENGTH, "psys-%d",
- topology_physical_package_id(rp->lead_cpu));
- } else
+ rp->lead_cpu >= 0 ? topology_physical_package_id(rp->lead_cpu) :
+ rp->id);
+ } else {
snprintf(rd->name, RAPL_DOMAIN_NAME_LENGTH, "%s",
rapl_domain_names[i]);
+ }
rd->id = i;
@@ -716,7 +724,6 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
enum rapl_primitives prim_fixed = prim_fixups(rd, prim);
struct rapl_primitive_info *rpi = get_rpi(rd->rp, prim_fixed);
struct reg_action ra;
- int cpu;
if (!rpi || !rpi->name || rpi->flag & RAPL_PRIMITIVE_DUMMY)
return -EINVAL;
@@ -725,8 +732,6 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
if (!ra.reg)
return -EINVAL;
- cpu = rd->rp->lead_cpu;
-
/* non-hardware data are collected by the polling thread */
if (rpi->flag & RAPL_PRIMITIVE_DERIVED) {
*data = rd->rdd.primitives[prim];
@@ -735,8 +740,8 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
ra.mask = rpi->mask;
- if (rd->rp->priv->read_raw(cpu, &ra)) {
- pr_debug("failed to read reg 0x%llx on cpu %d\n", ra.reg, cpu);
+ if (rd->rp->priv->read_raw(get_rid(rd->rp), &ra)) {
+ pr_debug("failed to read reg 0x%llx for %s:%s\n", ra.reg, rd->rp->name, rd->name);
return -EIO;
}
@@ -757,7 +762,6 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
{
enum rapl_primitives prim_fixed = prim_fixups(rd, prim);
struct rapl_primitive_info *rpi = get_rpi(rd->rp, prim_fixed);
- int cpu;
u64 bits;
struct reg_action ra;
int ret;
@@ -765,7 +769,6 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
if (!rpi || !rpi->name || rpi->flag & RAPL_PRIMITIVE_DUMMY)
return -EINVAL;
- cpu = rd->rp->lead_cpu;
bits = rapl_unit_xlate(rd, rpi->unit, value, 1);
bits <<= rpi->shift;
bits &= rpi->mask;
@@ -776,7 +779,7 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
ra.mask = rpi->mask;
ra.value = bits;
- ret = rd->rp->priv->write_raw(cpu, &ra);
+ ret = rd->rp->priv->write_raw(get_rid(rd->rp), &ra);
return ret;
}
@@ -826,9 +829,9 @@ static int rapl_check_unit_core(struct rapl_domain *rd)
ra.reg = rd->regs[RAPL_DOMAIN_REG_UNIT];
ra.mask = ~0;
- if (rd->rp->priv->read_raw(rd->rp->lead_cpu, &ra)) {
- pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n",
- ra.reg, rd->rp->lead_cpu);
+ if (rd->rp->priv->read_raw(get_rid(rd->rp), &ra)) {
+ pr_err("Failed to read power unit REG 0x%llx on %s:%s, exit.\n",
+ ra.reg, rd->rp->name, rd->name);
return -ENODEV;
}
@@ -854,9 +857,9 @@ static int rapl_check_unit_atom(struct rapl_domain *rd)
ra.reg = rd->regs[RAPL_DOMAIN_REG_UNIT];
ra.mask = ~0;
- if (rd->rp->priv->read_raw(rd->rp->lead_cpu, &ra)) {
- pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n",
- ra.reg, rd->rp->lead_cpu);
+ if (rd->rp->priv->read_raw(get_rid(rd->rp), &ra)) {
+ pr_err("Failed to read power unit REG 0x%llx on %s:%s, exit.\n",
+ ra.reg, rd->rp->name, rd->name);
return -ENODEV;
}
@@ -902,6 +905,9 @@ static void power_limit_irq_save_cpu(void *info)
static void package_power_limit_irq_save(struct rapl_package *rp)
{
+ if (rp->lead_cpu < 0)
+ return;
+
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
@@ -916,6 +922,9 @@ static void package_power_limit_irq_restore(struct rapl_package *rp)
{
u32 l, h;
+ if (rp->lead_cpu < 0)
+ return;
+
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
return;
@@ -1254,7 +1263,7 @@ static int rapl_check_domain(int domain, struct rapl_package *rp)
*/
ra.mask = ENERGY_STATUS_MASK;
- if (rp->priv->read_raw(rp->lead_cpu, &ra) || !ra.value)
+ if (rp->priv->read_raw(get_rid(rp), &ra) || !ra.value)
return -ENODEV;
return 0;
@@ -1391,13 +1400,18 @@ void rapl_remove_package(struct rapl_package *rp)
EXPORT_SYMBOL_GPL(rapl_remove_package);
/* caller to ensure CPU hotplug lock is held */
-struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_if_priv *priv)
+struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv, bool id_is_cpu)
{
- int id = topology_logical_die_id(cpu);
struct rapl_package *rp;
+ int uid;
+
+ if (id_is_cpu)
+ uid = topology_logical_die_id(id);
+ else
+ uid = id;
list_for_each_entry(rp, &rapl_packages, plist) {
- if (rp->id == id
+ if (rp->id == uid
&& rp->priv->control_type == priv->control_type)
return rp;
}
@@ -1407,9 +1421,8 @@ struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_if_priv *priv
EXPORT_SYMBOL_GPL(rapl_find_package_domain);
/* called from CPU hotplug notifier, hotplug lock held */
-struct rapl_package *rapl_add_package(int cpu, struct rapl_if_priv *priv)
+struct rapl_package *rapl_add_package(int id, struct rapl_if_priv *priv, bool id_is_cpu)
{
- int id = topology_logical_die_id(cpu);
struct rapl_package *rp;
int ret;
@@ -1417,23 +1430,26 @@ struct rapl_package *rapl_add_package(int cpu, struct rapl_if_priv *priv)
if (!rp)
return ERR_PTR(-ENOMEM);
- /* add the new package to the list */
- rp->id = id;
- rp->lead_cpu = cpu;
- rp->priv = priv;
+ if (id_is_cpu) {
+ rp->id = topology_logical_die_id(id);
+ rp->lead_cpu = id;
+ if (topology_max_die_per_package() > 1)
+ snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d-die-%d",
+ topology_physical_package_id(id), topology_die_id(id));
+ else
+ snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d",
+ topology_physical_package_id(id));
+ } else {
+ rp->id = id;
+ rp->lead_cpu = -1;
+ snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d", id);
+ }
+ rp->priv = priv;
ret = rapl_config(rp);
if (ret)
goto err_free_package;
- if (topology_max_die_per_package() > 1)
- snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
- "package-%d-die-%d",
- topology_physical_package_id(cpu), topology_die_id(cpu));
- else
- snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d",
- topology_physical_package_id(cpu));
-
/* check if the package contains valid domains */
if (rapl_detect_domains(rp)) {
ret = -ENODEV;
diff --git a/drivers/powercap/intel_rapl_msr.c b/drivers/powercap/intel_rapl_msr.c
index e78460620340..3e48e729050d 100644
--- a/drivers/powercap/intel_rapl_msr.c
+++ b/drivers/powercap/intel_rapl_msr.c
@@ -68,9 +68,9 @@ static int rapl_cpu_online(unsigned int cpu)
{
struct rapl_package *rp;
- rp = rapl_find_package_domain(cpu, rapl_msr_priv);
+ rp = rapl_find_package_domain(cpu, rapl_msr_priv, true);
if (!rp) {
- rp = rapl_add_package(cpu, rapl_msr_priv);
+ rp = rapl_add_package(cpu, rapl_msr_priv, true);
if (IS_ERR(rp))
return PTR_ERR(rp);
}
@@ -83,7 +83,7 @@ static int rapl_cpu_down_prep(unsigned int cpu)
struct rapl_package *rp;
int lead_cpu;
- rp = rapl_find_package_domain(cpu, rapl_msr_priv);
+ rp = rapl_find_package_domain(cpu, rapl_msr_priv, true);
if (!rp)
return 0;
diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
index e070239106f5..140fb85cfa7b 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
@@ -27,9 +27,9 @@ static int rapl_mmio_cpu_online(unsigned int cpu)
if (topology_physical_package_id(cpu))
return 0;
- rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
+ rp = rapl_find_package_domain(cpu, &rapl_mmio_priv, true);
if (!rp) {
- rp = rapl_add_package(cpu, &rapl_mmio_priv);
+ rp = rapl_add_package(cpu, &rapl_mmio_priv, true);
if (IS_ERR(rp))
return PTR_ERR(rp);
}
@@ -42,7 +42,7 @@ static int rapl_mmio_cpu_down_prep(unsigned int cpu)
struct rapl_package *rp;
int lead_cpu;
- rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
+ rp = rapl_find_package_domain(cpu, &rapl_mmio_priv, true);
if (!rp)
return 0;
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 325ec00be7a7..d92ded956140 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -135,8 +135,8 @@ struct rapl_if_priv {
u64 reg_unit;
u64 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
int limits[RAPL_DOMAIN_MAX];
- int (*read_raw)(int cpu, struct reg_action *ra);
- int (*write_raw)(int cpu, struct reg_action *ra);
+ int (*read_raw)(int id, struct reg_action *ra);
+ int (*write_raw)(int id, struct reg_action *ra);
void *rpd;
void *rpi;
};
@@ -161,8 +161,8 @@ struct rapl_package {
struct rapl_if_priv *priv;
};
-struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_if_priv *priv);
-struct rapl_package *rapl_add_package(int cpu, struct rapl_if_priv *priv);
+struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv, bool id_is_cpu);
+struct rapl_package *rapl_add_package(int id, struct rapl_if_priv *priv, bool id_is_cpu);
void rapl_remove_package(struct rapl_package *rp);
#endif /* __INTEL_RAPL_H__ */
--
2.25.1