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thermal: intel: Add resources to handle directed package-level thermal interrupts

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When supported by hardware, a CPU requests to receive directed package-
level thermal interrupts by setting a designated bit in
IA32_THERM_INTERRUPT. It is sufficient to have one CPU per package handling
the interrupt.

Add an array to keep track of those CPUs as well as init and cleanup
functions. A subsequent changeset will designate a CPU per package to
handle the interrupt.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://patch.msgid.link/20260613-rneri-directed-therm-intr-v3-3-3a26d1e47fc8@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ricardo Neri 2026-06-13 15:17:49 -07:00 committed by Rafael J. Wysocki
parent ac5cc691eb
commit 2bedc06404
1 changed files with 52 additions and 1 deletions
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53
drivers/thermal/intel/therm_throt.c
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@ -524,6 +524,50 @@ static void thermal_throttle_remove_dev(struct device *dev)
sysfs_remove_group(&dev->kobj, &thermal_attr_group);
}
/*
* Accessed from CPU hotplug callbacks and from code that runs while CPU
* hotplug is inactive: the init and cleanup paths.
* No extra locking needed.
*/
static unsigned int *directed_intr_handler_cpus;
static bool directed_thermal_pkg_intr_supported(void)
{
if (!boot_cpu_has(X86_FEATURE_DPTI))
return false;
if (!directed_intr_handler_cpus)
return false;
return true;
}
static __init void init_directed_pkg_intr(void)
{
int i;
if (!boot_cpu_has(X86_FEATURE_DPTI))
return;
directed_intr_handler_cpus = kmalloc_array(topology_max_packages(),
sizeof(*directed_intr_handler_cpus),
GFP_KERNEL);
if (!directed_intr_handler_cpus)
return;
for (i = 0; i < topology_max_packages(); i++)
directed_intr_handler_cpus[i] = nr_cpu_ids;
}
static void cleanup_directed_pkg_thermal_intr(void)
{
if (!directed_thermal_pkg_intr_supported())
return;
kfree(directed_intr_handler_cpus);
directed_intr_handler_cpus = NULL;
}
/* Get notified when a cpu comes on/off. Be hotplug friendly. */
static int thermal_throttle_online(unsigned int cpu)
{
@ -585,12 +629,19 @@ static __init int thermal_throttle_init_device(void)
if (!atomic_read(&therm_throt_en))
return 0;
init_directed_pkg_intr();
intel_hfi_init();
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/therm:online",
thermal_throttle_online,
thermal_throttle_offline);
return ret < 0 ? ret : 0;
if (ret >= 0)
return 0;
cleanup_directed_pkg_thermal_intr();
return ret;
}
device_initcall(thermal_throttle_init_device);