Re: [PATCH V1 2/6] cpufreq: amd-pstate: Enable AMD Pstate Preferred Core Supporting.

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On 8/8/2023 03:09, Meng Li wrote:
AMD Pstate driver utilizes the functions and data structures
provided by the ITMT architecture to enable the scheduler to
favor scheduling on cores which can be get a higher frequency
with lower voltage. We call it AMD Pstate Preferrred Core.

Here sched_set_itmt_core_prio() is called to set priorities and
sched_set_itmt_support() is called to enable ITMT feature.

By using this function you need to also ensure that CONFIG_SCHED_MC_PRIO has been set up in drivers/cpufreq/Kconfig.x86 when amd-pstate is used.

Also I think it's worth changing arch/x86/Kconfig to:
1) Drop the requirement for CPU_SUP_INTEL
2) select X86_AMD_PSTATE

AMD Pstate driver uses the highest performance value to indicate
the priority of CPU. The higher value has a higher priority.

The initial core rankings are set up by AMD Pstate when the
system boots.

Add device attribute for preferred core states.

Add one new early parameter `enable` to allow user to
enable the preferred core if the processor and power
firmware can support preferred core feature.

Signed-off-by: Meng Li <li.meng@xxxxxxx>
Signed-off-by: Perry Yuan <Perry.Yuan@xxxxxxx>
---
  drivers/cpufreq/amd-pstate.c | 149 +++++++++++++++++++++++++++++++----
  1 file changed, 133 insertions(+), 16 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 9a1e194d5cf8..e919b3f4ab18 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -37,6 +37,7 @@
  #include <linux/uaccess.h>
  #include <linux/static_call.h>
  #include <linux/amd-pstate.h>
+#include <linux/topology.h>
#include <acpi/processor.h>
  #include <acpi/cppc_acpi.h>
@@ -49,6 +50,8 @@
#define AMD_PSTATE_TRANSITION_LATENCY 20000
  #define AMD_PSTATE_TRANSITION_DELAY	1000
+#define AMD_PSTATE_PREFCORE_THRESHOLD	166
+#define AMD_PSTATE_MAX_CPPC_PERF	255
/*
   * TODO: We need more time to fine tune processors with shared memory solution
@@ -65,6 +68,14 @@ static struct cpufreq_driver amd_pstate_epp_driver;
  static int cppc_state = AMD_PSTATE_UNDEFINED;
  static bool cppc_enabled;
+/*
+ * CPPC Preferred Core feature is supported by power firmware
+ */
+static bool prefcore_enabled = false;
+
+/* Disable AMD Pstate Preferred Core loading */
+static bool no_prefcore __read_mostly = true;
+
  /*
   * AMD Energy Preference Performance (EPP)
   * The EPP is used in the CCLK DPM controller to drive
@@ -290,23 +301,21 @@ static inline int amd_pstate_enable(bool enable)
  static int pstate_init_perf(struct amd_cpudata *cpudata)
  {
  	u64 cap1;
-	u32 highest_perf;
int ret = rdmsrl_safe_on_cpu(cpudata->cpu, MSR_AMD_CPPC_CAP1,
  				     &cap1);
  	if (ret)
  		return ret;
- /*
-	 * TODO: Introduce AMD specific power feature.
-	 *
-	 * CPPC entry doesn't indicate the highest performance in some ASICs.
+	/* For platforms that do not support the preferred core feature, the
+	 * highest_pef may be configured with 166 or 255, to avoid max frequency
+	 * calculated wrongly. we take the AMD_CPPC_HIGHEST_PERF(cap1) value as
+	 * the default max perf.
  	 */
-	highest_perf = amd_get_highest_perf();
-	if (highest_perf > AMD_CPPC_HIGHEST_PERF(cap1))
-		highest_perf = AMD_CPPC_HIGHEST_PERF(cap1);
-
-	WRITE_ONCE(cpudata->highest_perf, highest_perf);
+	if (!prefcore_enabled)
+		WRITE_ONCE(cpudata->highest_perf, AMD_CPPC_HIGHEST_PERF(cap1));
+	else
+		WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD);
WRITE_ONCE(cpudata->nominal_perf, AMD_CPPC_NOMINAL_PERF(cap1));
  	WRITE_ONCE(cpudata->lowest_nonlinear_perf, AMD_CPPC_LOWNONLIN_PERF(cap1));
@@ -318,17 +327,15 @@ static int pstate_init_perf(struct amd_cpudata *cpudata)
  static int cppc_init_perf(struct amd_cpudata *cpudata)
  {
  	struct cppc_perf_caps cppc_perf;
-	u32 highest_perf;
int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf);
  	if (ret)
  		return ret;
- highest_perf = amd_get_highest_perf();
-	if (highest_perf > cppc_perf.highest_perf)
-		highest_perf = cppc_perf.highest_perf;
-
-	WRITE_ONCE(cpudata->highest_perf, highest_perf);
+	if (!prefcore_enabled)
+		WRITE_ONCE(cpudata->highest_perf, cppc_perf.highest_perf);
+	else
+		WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD);
WRITE_ONCE(cpudata->nominal_perf, cppc_perf.nominal_perf);
  	WRITE_ONCE(cpudata->lowest_nonlinear_perf,
@@ -676,6 +683,90 @@ static void amd_perf_ctl_reset(unsigned int cpu)
  	wrmsrl_on_cpu(cpu, MSR_AMD_PERF_CTL, 0);
  }
+/*
+ * Set AMD Pstate Preferred Core enable can't be done directly from cpufreq callbacks
+ * due to locking, so queue the work for later.
+ */
+static void amd_pstste_sched_prefcore_workfn(struct work_struct *work)
+{
+	sched_set_itmt_support();
+}
+static DECLARE_WORK(sched_prefcore_work, amd_pstste_sched_prefcore_workfn);
+
+/**
+ * Get the highest performance register value.
+ * @cpu: CPU from which to get highest performance.
+ * @highest_perf: Return address.
+ *
+ * Return: 0 for success, -EIO otherwise.
+ */
+static int amd_pstate_get_highest_perf(int cpu, u64 *highest_perf)
+{
+       int ret;
+
+       if (boot_cpu_has(X86_FEATURE_CPPC)) {
+               u64 cap1;
+
+               ret = rdmsrl_safe_on_cpu(cpu, MSR_AMD_CPPC_CAP1, &cap1);
+               if (ret)
+                       return ret;
+               WRITE_ONCE(*highest_perf, AMD_CPPC_HIGHEST_PERF(cap1));
+       } else {
+               ret = cppc_get_highest_perf(cpu, highest_perf);
+       }
+
+       return (ret);
+}
+
+static void amd_pstate_init_prefcore(void)
+{
+	int cpu, ret;
+	u64 highest_perf;
+
+	if (no_prefcore)
+		return;
+
+	for_each_possible_cpu(cpu) {
+		ret = amd_pstate_get_highest_perf(cpu, &highest_perf);
+		if (ret)
+			break;
+
+		sched_set_itmt_core_prio(highest_perf, cpu);
+	}
+
+	/*
+	 * This code can be run during CPU online under the
+	 * CPU hotplug locks, so sched_set_amd_prefcore_support()
+	 * cannot be called from here.  Queue up a work item
+	 * to invoke it.
+	 */
+	schedule_work(&sched_prefcore_work);
+}
+
+/*
+ * Check if AMD Pstate Preferred core feature is supported and enabled
+ * 1) no_prefcore is used to enable or disable AMD Pstate Preferred Core
+ * loading when user would like to enable or disable it. Without that,
+ * AMD Pstate Preferred Core will be disabled by default if the processor
+ * and power firmware can support preferred core feature.
+ * 2) prefcore_enabled is used to indicate whether CPPC preferred core is enabled.
+ */
+static void check_prefcore_supported(int cpu)
+{
+	u64 highest_perf;
+	int ret;
+
+	if (no_prefcore)
+		return;
+
+	ret = amd_pstate_get_highest_perf(cpu, &highest_perf);
+	if (ret)
+		return;
+
+	if(highest_perf < AMD_PSTATE_MAX_CPPC_PERF)
+		prefcore_enabled = true;
+}
+
  static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
  {
  	int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret;
@@ -697,6 +788,9 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
cpudata->cpu = policy->cpu; + /* check if CPPC preferred core feature is enabled*/
+	check_prefcore_supported(policy->cpu);
+
  	ret = amd_pstate_init_perf(cpudata);
  	if (ret)
  		goto free_cpudata1;
@@ -1037,6 +1131,12 @@ static ssize_t status_store(struct device *a, struct device_attribute *b,
  	return ret < 0 ? ret : count;
  }
+static ssize_t prefcore_state_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%s\n", prefcore_enabled ? "enabled" : "disabled");
+}
+
  cpufreq_freq_attr_ro(amd_pstate_max_freq);
  cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
@@ -1044,6 +1144,7 @@ cpufreq_freq_attr_ro(amd_pstate_highest_perf);
  cpufreq_freq_attr_rw(energy_performance_preference);
  cpufreq_freq_attr_ro(energy_performance_available_preferences);
  static DEVICE_ATTR_RW(status);
+static DEVICE_ATTR_RO(prefcore_state);
static struct freq_attr *amd_pstate_attr[] = {
  	&amd_pstate_max_freq,
@@ -1063,6 +1164,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
static struct attribute *pstate_global_attributes[] = {
  	&dev_attr_status.attr,
+	&dev_attr_prefcore_state.attr,
  	NULL
  };
@@ -1114,6 +1216,9 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
  	cpudata->cpu = policy->cpu;
  	cpudata->epp_policy = 0;
+ /* check if CPPC preferred core feature is supported*/
+	check_prefcore_supported(policy->cpu);
+
  	ret = amd_pstate_init_perf(cpudata);
  	if (ret)
  		goto free_cpudata1;
@@ -1506,6 +1611,8 @@ static int __init amd_pstate_init(void)
  		}
  	}
+ amd_pstate_init_prefcore();
+
  	return ret;
global_attr_free:
@@ -1527,7 +1634,17 @@ static int __init amd_pstate_param(char *str)
return amd_pstate_set_driver(mode_idx);
  }
+
+static int __init amd_prefcore_param(char *str)
+{
+	if (!strcmp(str, "enable"))
+		no_prefcore = false;
+
+	return 0;
+}
+
  early_param("amd_pstate", amd_pstate_param);
+early_param("amd_prefcore", amd_prefcore_param);
MODULE_AUTHOR("Huang Rui <ray.huang@xxxxxxx>");
  MODULE_DESCRIPTION("AMD Processor P-state Frequency Driver");




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