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powercap: intel_rapl: Fix locking in TPMI RAPL 

[ Upstream commit 1aa09b9379a7a644cd2f75ae0bac82b8783df600 ]

The RAPL framework uses CPU hotplug locking to protect the rapl_packages
list and rp->lead_cpu to guarantee that

 1. the RAPL package device is not unprobed and freed
 2. the cached rp->lead_cpu is always valid

for operations like powercap sysfs accesses.

Current RAPL APIs assume being called from CPU hotplug callbacks which
hold the CPU hotplug lock, but TPMI RAPL driver invokes the APIs in the
driver's .probe() function without acquiring the CPU hotplug lock.

Fix the problem by providing both locked and lockless versions of RAPL
APIs.

Fixes: 9eef7f9da9 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: 6.5+ <stable@vger.kernel.org> # 6.5+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Rui 2024-01-31 19:37:09 +08:00 committed by Greg Kroah-Hartman
parent c4c2f7e672
commit d6c83ee705
4 changed files with 40 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/powercap/intel_rapl_common.c
View File

@ -5,6 +5,7 @@
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cleanup.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
@ -1504,7 +1505,7 @@ static int rapl_detect_domains(struct rapl_package *rp)
}
/* called from CPU hotplug notifier, hotplug lock held */
void rapl_remove_package(struct rapl_package *rp)
void rapl_remove_package_cpuslocked(struct rapl_package *rp)
{
struct rapl_domain *rd, *rd_package = NULL;
@ -1533,10 +1534,18 @@ void rapl_remove_package(struct rapl_package *rp)
list_del(&rp->plist);
kfree(rp);
}
EXPORT_SYMBOL_GPL(rapl_remove_package_cpuslocked);
void rapl_remove_package(struct rapl_package *rp)
{
guard(cpus_read_lock)();
rapl_remove_package_cpuslocked(rp);
}
EXPORT_SYMBOL_GPL(rapl_remove_package);
/* caller to ensure CPU hotplug lock is held */
struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv, bool id_is_cpu)
struct rapl_package *rapl_find_package_domain_cpuslocked(int id, struct rapl_if_priv *priv,
bool id_is_cpu)
{
struct rapl_package *rp;
int uid;
@ -1554,10 +1563,17 @@ struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv,
return NULL;
}
EXPORT_SYMBOL_GPL(rapl_find_package_domain_cpuslocked);
struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv, bool id_is_cpu)
{
guard(cpus_read_lock)();
return rapl_find_package_domain_cpuslocked(id, priv, id_is_cpu);
}
EXPORT_SYMBOL_GPL(rapl_find_package_domain);
/* called from CPU hotplug notifier, hotplug lock held */
struct rapl_package *rapl_add_package(int id, struct rapl_if_priv *priv, bool id_is_cpu)
struct rapl_package *rapl_add_package_cpuslocked(int id, struct rapl_if_priv *priv, bool id_is_cpu)
{
struct rapl_package *rp;
int ret;
@ -1603,6 +1619,13 @@ err_free_package:
kfree(rp);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(rapl_add_package_cpuslocked);
struct rapl_package *rapl_add_package(int id, struct rapl_if_priv *priv, bool id_is_cpu)
{
guard(cpus_read_lock)();
return rapl_add_package_cpuslocked(id, priv, id_is_cpu);
}
EXPORT_SYMBOL_GPL(rapl_add_package);
static void power_limit_state_save(void)

8
drivers/powercap/intel_rapl_msr.c
View File

@ -73,9 +73,9 @@ static int rapl_cpu_online(unsigned int cpu)
{
struct rapl_package *rp;
rp = rapl_find_package_domain(cpu, rapl_msr_priv, true);
rp = rapl_find_package_domain_cpuslocked(cpu, rapl_msr_priv, true);
if (!rp) {
rp = rapl_add_package(cpu, rapl_msr_priv, true);
rp = rapl_add_package_cpuslocked(cpu, rapl_msr_priv, true);
if (IS_ERR(rp))
return PTR_ERR(rp);
}
@ -88,14 +88,14 @@ 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, true);
rp = rapl_find_package_domain_cpuslocked(cpu, rapl_msr_priv, true);
if (!rp)
return 0;
cpumask_clear_cpu(cpu, &rp->cpumask);
lead_cpu = cpumask_first(&rp->cpumask);
if (lead_cpu >= nr_cpu_ids)
rapl_remove_package(rp);
rapl_remove_package_cpuslocked(rp);
else if (rp->lead_cpu == cpu)
rp->lead_cpu = lead_cpu;
return 0;

8
drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
View File

@ -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, true);
rp = rapl_find_package_domain_cpuslocked(cpu, &rapl_mmio_priv, true);
if (!rp) {
rp = rapl_add_package(cpu, &rapl_mmio_priv, true);
rp = rapl_add_package_cpuslocked(cpu, &rapl_mmio_priv, true);
if (IS_ERR(rp))
return PTR_ERR(rp);
}
@ -42,14 +42,14 @@ 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, true);
rp = rapl_find_package_domain_cpuslocked(cpu, &rapl_mmio_priv, true);
if (!rp)
return 0;
cpumask_clear_cpu(cpu, &rp->cpumask);
lead_cpu = cpumask_first(&rp->cpumask);
if (lead_cpu >= nr_cpu_ids)
rapl_remove_package(rp);
rapl_remove_package_cpuslocked(rp);
else if (rp->lead_cpu == cpu)
rp->lead_cpu = lead_cpu;
return 0;

6
include/linux/intel_rapl.h
View File

@ -178,6 +178,12 @@ struct rapl_package {
struct rapl_if_priv *priv;
};
struct rapl_package *rapl_find_package_domain_cpuslocked(int id, struct rapl_if_priv *priv,
bool id_is_cpu);
struct rapl_package *rapl_add_package_cpuslocked(int id, struct rapl_if_priv *priv,
bool id_is_cpu);
void rapl_remove_package_cpuslocked(struct rapl_package *rp);
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);