Merge tag 'amd-pstate-v6.11-2024-06-24' of...

Merge tag 'amd-pstate-v6.11-2024-06-24' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux

Merge the second round of changes for amd-pstate in 6.11 from Mario
Limonciello:

"* Enables amd-pstate by default in "shared memory" designs without
   a dedicated MSR.
 * Adds extra infrastructure for debugging problems.
 * Bug fixes found for init/unload failure."

* tag 'amd-pstate-v6.11-2024-06-24' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux:
  cpufreq: simplify boolean parsing with kstrtobool in store function
  cpufreq: amd-pstate: Don't create attributes when registration fails
  cpufreq: amd-pstate: Make amd-pstate unit tests depend on amd-pstate
  cpufreq/amd-pstate: fix setting policy current frequency value
  cpufreq: amd-pstate: auto-load pstate driver by default
  cpufreq: amd-pstate: enable shared memory type CPPC by default
  cpufreq: amd-pstate: switch boot_cpu_has() to cpu_feature_enabled()
  Documentation: PM: amd-pstate: add guided mode to the Operation mode
  cpufreq: amd-pstate: add debug message while CPPC is supported and disabled by SBIOS
  cpufreq: amd-pstate: show CPPC debug message if CPPC is not supported
  cpufreq: amd-pstate: remove unused variable nominal_freq
  cpufreq: amd-pstate: optimize the initial frequency values verification
  cpufreq: amd-pstate: Allow users to write 'default' EPP string

Documentation/admin-guide/pm/amd-pstate.rst

@@ -406,7 +406,7 @@ control its functionality at the system level.  They are located in the
 ``/sys/devices/system/cpu/amd_pstate/`` directory and affect all CPUs.
 
 ``status``
-	Operation mode of the driver: "active", "passive" or "disable".
+	Operation mode of the driver: "active", "passive", "guided" or "disable".
 
 	"active"
 		The driver is functional and in the ``active mode``

drivers/cpufreq/Kconfig.x86

@@ -71,6 +71,7 @@ config X86_AMD_PSTATE_DEFAULT_MODE
 config X86_AMD_PSTATE_UT
 	tristate "selftest for AMD Processor P-State driver"
 	depends on X86 && ACPI_PROCESSOR
+	depends on X86_AMD_PSTATE
 	default n
 	help
 	  This kernel module is used for testing. It's safe to say M here.

drivers/cpufreq/amd-pstate.h

@@ -99,6 +99,7 @@ struct amd_cpudata {
 	u32	policy;
 	u64	cppc_cap1_cached;
 	bool	suspended;
+	s16	epp_default;
 };
 
 #endif /* _LINUX_AMD_PSTATE_H */

drivers/cpufreq/cpufreq.c

@@ -614,10 +614,9 @@ static ssize_t show_boost(struct kobject *kobj,
 static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr,
 			   const char *buf, size_t count)
 {
-	int ret, enable;
+	bool enable;
 
-	ret = sscanf(buf, "%d", &enable);
-	if (ret != 1 || enable < 0 || enable > 1)
+	if (kstrtobool(buf, &enable))
 		return -EINVAL;
 
 	if (cpufreq_boost_trigger_state(enable)) {
@@ -641,10 +640,10 @@ static ssize_t show_local_boost(struct cpufreq_policy *policy, char *buf)
 static ssize_t store_local_boost(struct cpufreq_policy *policy,
 				 const char *buf, size_t count)
 {
-	int ret, enable;
+	int ret;
+	bool enable;
 
-	ret = kstrtoint(buf, 10, &enable);
-	if (ret || enable < 0 || enable > 1)
+	if (kstrtobool(buf, &enable))
 		return -EINVAL;
 
 	if (!cpufreq_driver->boost_enabled)