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Date: Wed, 1 Feb 2023 06:58:22 +0000
From: Wyes Karny <wyes.karny@....com>
To: Rafael J Wysocki <rafael@...nel.org>,
Huang Rui <ray.huang@....com>,
Jonathan Corbet <corbet@....net>,
Viresh Kumar <viresh.kumar@...aro.org>,
<Mario.Limonciello@....com>, <Perry.Yuan@....com>
CC: <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-pm@...r.kernel.org>, Bagas Sanjaya <bagasdotme@...il.com>,
<santosh.shukla@....com>, Len Brown <lenb@...nel.org>,
Robert Moore <robert.moore@...el.com>,
Borislav Petkov <bp@...en8.de>,
Ananth Narayan <ananth.narayan@....com>,
<gautham.shenoy@....com>, Tor Vic <torvic9@...lbox.org>,
Wyes Karny <wyes.karny@....com>,
Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v5 5/6] cpufreq: amd_pstate: Add guided mode control support via sysfs
amd_pstate driver's `status` sysfs entry helps to control the driver's
mode dynamically by user. After the addition of guided mode the
combinations of mode transitions have been increased (16 combinations).
Therefore optimise the amd_pstate_update_status function by implementing
a state transition table.
There are 4 states amd_pstate supports, namely: 'disable', 'passive',
'active', and 'guided'. The transition from any state to any other
state is possible after this change. Only if the state requested matches
with the current state then -EBUSY value is returned.
Sysfs interface:
To disable amd_pstate driver:
# echo disable > /sys/devices/system/cpu/amd_pstate/status
To enable passive mode:
# echo passive > /sys/devices/system/cpu/amd_pstate/status
To change mode to active:
# echo active > /sys/devices/system/cpu/amd_pstate/status
To change mode to guided:
# echo guided > /sys/devices/system/cpu/amd_pstate/status
Signed-off-by: Wyes Karny <wyes.karny@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
---
drivers/cpufreq/amd-pstate.c | 149 +++++++++++++++++++++++++----------
1 file changed, 107 insertions(+), 42 deletions(-)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index e9b9327c249d..6631aef8258b 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -106,6 +106,8 @@ static unsigned int epp_values[] = {
[EPP_INDEX_POWERSAVE] = AMD_CPPC_EPP_POWERSAVE,
};
+typedef int (*cppc_mode_transition_fn)(int);
+
static inline int get_mode_idx_from_str(const char *str, size_t size)
{
int i;
@@ -838,6 +840,104 @@ static ssize_t show_energy_performance_preference(
return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]);
}
+static void amd_pstate_driver_cleanup(void)
+{
+ amd_pstate_enable(false);
+ cppc_state = AMD_PSTATE_DISABLE;
+ current_pstate_driver = NULL;
+}
+
+static int amd_pstate_register_driver(int mode)
+{
+ int ret;
+
+ if (mode == AMD_PSTATE_PASSIVE || mode == AMD_PSTATE_GUIDED)
+ current_pstate_driver = &amd_pstate_driver;
+ else if (mode == AMD_PSTATE_ACTIVE)
+ current_pstate_driver = &amd_pstate_epp_driver;
+ else
+ return -EINVAL;
+
+ cppc_state = mode;
+ ret = cpufreq_register_driver(current_pstate_driver);
+ if (ret) {
+ amd_pstate_driver_cleanup();
+ return ret;
+ }
+ return 0;
+}
+
+static int amd_pstate_unregister_driver(int dummy)
+{
+ int ret;
+
+ ret = cpufreq_unregister_driver(current_pstate_driver);
+
+ if (ret)
+ return ret;
+
+ amd_pstate_driver_cleanup();
+ return 0;
+}
+
+static int amd_pstate_change_mode_without_dvr_change(int mode)
+{
+ int cpu = 0;
+
+ cppc_state = mode;
+
+ if (boot_cpu_has(X86_FEATURE_CPPC) || cppc_state == AMD_PSTATE_ACTIVE)
+ return 0;
+
+ for_each_present_cpu(cpu) {
+ cppc_set_auto_sel(cpu, (cppc_state == AMD_PSTATE_PASSIVE) ? 0 : 1);
+ }
+
+ return 0;
+}
+
+static int amd_pstate_change_driver_mode(int mode)
+{
+ int ret;
+
+ ret = amd_pstate_unregister_driver(0);
+ if (ret)
+ return ret;
+
+ ret = amd_pstate_register_driver(mode);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+cppc_mode_transition_fn mode_state_machine[AMD_PSTATE_MAX][AMD_PSTATE_MAX] = {
+ [AMD_PSTATE_DISABLE] = {
+ [AMD_PSTATE_DISABLE] = NULL,
+ [AMD_PSTATE_PASSIVE] = amd_pstate_register_driver,
+ [AMD_PSTATE_ACTIVE] = amd_pstate_register_driver,
+ [AMD_PSTATE_GUIDED] = amd_pstate_register_driver,
+ },
+ [AMD_PSTATE_PASSIVE] = {
+ [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver,
+ [AMD_PSTATE_PASSIVE] = NULL,
+ [AMD_PSTATE_ACTIVE] = amd_pstate_change_driver_mode,
+ [AMD_PSTATE_GUIDED] = amd_pstate_change_mode_without_dvr_change,
+ },
+ [AMD_PSTATE_ACTIVE] = {
+ [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver,
+ [AMD_PSTATE_PASSIVE] = amd_pstate_change_driver_mode,
+ [AMD_PSTATE_ACTIVE] = NULL,
+ [AMD_PSTATE_GUIDED] = amd_pstate_change_driver_mode,
+ },
+ [AMD_PSTATE_GUIDED] = {
+ [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver,
+ [AMD_PSTATE_PASSIVE] = amd_pstate_change_mode_without_dvr_change,
+ [AMD_PSTATE_ACTIVE] = amd_pstate_change_driver_mode,
+ [AMD_PSTATE_GUIDED] = NULL,
+ },
+};
+
static ssize_t amd_pstate_show_status(char *buf)
{
if (!current_pstate_driver)
@@ -846,57 +946,22 @@ static ssize_t amd_pstate_show_status(char *buf)
return sysfs_emit(buf, "%s\n", amd_pstate_mode_string[cppc_state]);
}
-static void amd_pstate_driver_cleanup(void)
-{
- current_pstate_driver = NULL;
-}
-
static int amd_pstate_update_status(const char *buf, size_t size)
{
- int ret;
int mode_idx;
- if (size > 7 || size < 6)
+ if (size > strlen("passive") || size < strlen("active"))
return -EINVAL;
- mode_idx = get_mode_idx_from_str(buf, size);
- switch(mode_idx) {
- case AMD_PSTATE_DISABLE:
- if (!current_pstate_driver)
- return -EINVAL;
- if (cppc_state == AMD_PSTATE_ACTIVE)
- return -EBUSY;
- ret = cpufreq_unregister_driver(current_pstate_driver);
- amd_pstate_driver_cleanup();
- break;
- case AMD_PSTATE_PASSIVE:
- if (current_pstate_driver) {
- if (current_pstate_driver == &amd_pstate_driver)
- return 0;
- cpufreq_unregister_driver(current_pstate_driver);
- cppc_state = AMD_PSTATE_PASSIVE;
- current_pstate_driver = &amd_pstate_driver;
- }
+ mode_idx = get_mode_idx_from_str(buf, size);
- ret = cpufreq_register_driver(current_pstate_driver);
- break;
- case AMD_PSTATE_ACTIVE:
- if (current_pstate_driver) {
- if (current_pstate_driver == &amd_pstate_epp_driver)
- return 0;
- cpufreq_unregister_driver(current_pstate_driver);
- current_pstate_driver = &amd_pstate_epp_driver;
- cppc_state = AMD_PSTATE_ACTIVE;
- }
+ if (mode_idx < 0 || mode_idx >= AMD_PSTATE_MAX)
+ return -EINVAL;
- ret = cpufreq_register_driver(current_pstate_driver);
- break;
- default:
- ret = -EINVAL;
- break;
- }
+ if (mode_state_machine[cppc_state][mode_idx])
+ return mode_state_machine[cppc_state][mode_idx](mode_idx);
- return ret;
+ return -EBUSY;
}
static ssize_t show_status(struct kobject *kobj,
--
2.34.1
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