Merge tag 'pm-6.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a nasty hibernation regression introduced during the 6.16
  cycle, an issue related to energy model management occurring on Intel
  hybrid systems where some CPUs are offline to start with, and two
  regressions in the amd-pstate driver:

   - Restore a pm_restrict_gfp_mask() call in hibernation_snapshot()
     that was removed incorrectly during the 6.16 development cycle
     (Rafael Wysocki)

   - Introduce a function for registering a perf domain without
     triggering a system-wide CPU capacity update and make the
     intel_pstate driver use it to avoid reocurring unsuccessful
     attempts to update capacities of all CPUs in the system (Rafael
     Wysocki)

   - Fix setting of CPPC.min_perf in the active mode with performance
     governor in the amd-pstate driver to restore its expected behavior
     changed recently (Gautham Shenoy)

   - Avoid mistakenly setting EPP to 0 in the amd-pstate driver after
     system resume as a result of recent code changes (Mario
     Limonciello)"

* tag 'pm-6.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: hibernate: Restrict GFP mask in hibernation_snapshot()
  PM: EM: Add function for registering a PD without capacity update
  cpufreq/amd-pstate: Fix a regression leading to EPP 0 after resume
  cpufreq/amd-pstate: Fix setting of CPPC.min_perf in active mode for performance governor

2 files changed, 26 insertions, 4 deletions

diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index ea7995a25780..8df55397414a 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -553,6 +553,30 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
 				const struct em_data_callback *cb,
 				const cpumask_t *cpus, bool microwatts)
 {
+	int ret = em_dev_register_pd_no_update(dev, nr_states, cb, cpus, microwatts);
+
+	if (_is_cpu_device(dev))
+		em_check_capacity_update();
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(em_dev_register_perf_domain);
+
+/**
+ * em_dev_register_pd_no_update() - Register a perf domain for a device
+ * @dev : Device to register the PD for
+ * @nr_states : Number of performance states in the new PD
+ * @cb : Callback functions for populating the energy model
+ * @cpus : CPUs to include in the new PD (mandatory if @dev is a CPU device)
+ * @microwatts : Whether or not the power values in the EM will be in uW
+ *
+ * Like em_dev_register_perf_domain(), but does not trigger a CPU capacity
+ * update after registering the PD, even if @dev is a CPU device.
+ */
+int em_dev_register_pd_no_update(struct device *dev, unsigned int nr_states,
+				 const struct em_data_callback *cb,
+				 const cpumask_t *cpus, bool microwatts)
+{
 	struct em_perf_table *em_table;
 	unsigned long cap, prev_cap = 0;
 	unsigned long flags = 0;
@@ -636,12 +660,9 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
 unlock:
 	mutex_unlock(&em_pd_mutex);
 
-	if (_is_cpu_device(dev))
-		em_check_capacity_update();
-
 	return ret;
 }
-EXPORT_SYMBOL_GPL(em_dev_register_perf_domain);
+EXPORT_SYMBOL_GPL(em_dev_register_pd_no_update);
 
 /**
  * em_dev_unregister_perf_domain() - Unregister Energy Model (EM) for a device
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 1f1f30cca573..2f66ab453823 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -449,6 +449,7 @@ int hibernation_snapshot(int platform_mode)
 	shrink_shmem_memory();
 
 	console_suspend_all();
+	pm_restrict_gfp_mask();
 
 	error = dpm_suspend(PMSG_FREEZE);