drm/amd/pm: add support for hwmon control of slow and fast PPT limit on vangogh

Implement hwmon API for reading/setting slow and fast PPT limit.

APU power is managed to system-level requirements through the PPT
(package power tracking) feature. PPT is intended to limit power to the
requirements of the power source and could be dynamically updated to
maximize APU performance within the system power budget.

Here FAST_PPT_LIMIT manages the ~10 ms moving average of APU power,
while SLOW_PPT_LIMIT manages the configurable, thermally significant
moving average of APU power (default ~5000 ms).

User could read slow/fast ppt limit using command "cat power*_cap" or
"sensors" in the hwmon device directory. User could adjust values of
slow/fast ppt limit as needed depending on workloads through command
"echo ## > power*_cap".

Example:
$ echo 15000000 > power1_cap
$ echo 18000000 > power2_cap
$ sensors
amdgpu-pci-0300
Adapter: PCI adapter
slowPPT:     9.04W (cap = 15.00 W)
fastPPT:     9.04W (cap = 18.00 W)

v2: align with existing interfaces for the getting/setting of PPT
    limits. Encode the upper 8 bits of limit value to distinguish
    slow and fast power limit type.

Signed-off-by: Xiaomeng Hou <Xiaomeng.Hou@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
index 42271e80c0b4..3277014b5881 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
@@ -122,6 +122,10 @@ static struct cmn2asic_msg_mapping vangogh_message_map[SMU_MSG_MAX_COUNT] = {
 	MSG_MAP(SetSoftMinCclk,                     PPSMC_MSG_SetSoftMinCclk,						0),
 	MSG_MAP(SetSoftMaxCclk,                     PPSMC_MSG_SetSoftMaxCclk,						0),
 	MSG_MAP(RequestActiveWgp,                   PPSMC_MSG_RequestActiveWgp,                     0),
+	MSG_MAP(SetFastPPTLimit,                    PPSMC_MSG_SetFastPPTLimit,						0),
+	MSG_MAP(SetSlowPPTLimit,                    PPSMC_MSG_SetSlowPPTLimit,						0),
+	MSG_MAP(GetFastPPTLimit,                    PPSMC_MSG_GetFastPPTLimit,						0),
+	MSG_MAP(GetSlowPPTLimit,                    PPSMC_MSG_GetSlowPPTLimit,						0),
 };
 
 static struct cmn2asic_mapping vangogh_feature_mask_map[SMU_FEATURE_COUNT] = {
@@ -1773,6 +1777,112 @@ static int vangogh_mode2_reset(struct smu_context *smu)
 	return vangogh_mode_reset(smu, SMU_RESET_MODE_2);
 }
 
+static int vangogh_get_power_limit(struct smu_context *smu)
+{
+	struct smu_11_5_power_context *power_context =
+								smu->smu_power.power_context;
+	uint32_t ppt_limit;
+	int ret = 0;
+
+	if (smu->adev->pm.fw_version < 0x43f1e00)
+		return ret;
+
+	ret = smu_cmn_send_smc_msg(smu, SMU_MSG_GetSlowPPTLimit, &ppt_limit);
+	if (ret) {
+		dev_err(smu->adev->dev, "Get slow PPT limit failed!\n");
+		return ret;
+	}
+	/* convert from milliwatt to watt */
+	smu->current_power_limit = ppt_limit / 1000;
+	smu->max_power_limit = 29;
+
+	ret = smu_cmn_send_smc_msg(smu, SMU_MSG_GetFastPPTLimit, &ppt_limit);
+	if (ret) {
+		dev_err(smu->adev->dev, "Get fast PPT limit failed!\n");
+		return ret;
+	}
+	/* convert from milliwatt to watt */
+	power_context->current_fast_ppt_limit = ppt_limit / 1000;
+	power_context->max_fast_ppt_limit = 30;
+
+	return ret;
+}
+
+static int vangogh_get_ppt_limit(struct smu_context *smu,
+								uint32_t *ppt_limit,
+								enum smu_ppt_limit_type type,
+								enum smu_ppt_limit_level level)
+{
+	struct smu_11_5_power_context *power_context =
+							smu->smu_power.power_context;
+
+	if (!power_context)
+		return -EOPNOTSUPP;
+
+	if (type == SMU_FAST_PPT_LIMIT) {
+		switch (level) {
+		case SMU_PPT_LIMIT_MAX:
+			*ppt_limit = power_context->max_fast_ppt_limit;
+			break;
+		case SMU_PPT_LIMIT_CURRENT:
+			*ppt_limit = power_context->current_fast_ppt_limit;
+			break;
+		default:
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int vangogh_set_power_limit(struct smu_context *smu, uint32_t ppt_limit)
+{
+	struct smu_11_5_power_context *power_context =
+							smu->smu_power.power_context;
+	uint32_t limit_type = ppt_limit >> 24;
+	int ret = 0;
+
+	if (!smu_cmn_feature_is_enabled(smu, SMU_FEATURE_PPT_BIT)) {
+		dev_err(smu->adev->dev, "Setting new power limit is not supported!\n");
+		return -EOPNOTSUPP;
+	}
+
+	switch (limit_type) {
+	case SMU_DEFAULT_PPT_LIMIT:
+		ret = smu_cmn_send_smc_msg_with_param(smu,
+				SMU_MSG_SetSlowPPTLimit,
+				ppt_limit * 1000, /* convert from watt to milliwatt */
+				NULL);
+		if (ret)
+			return ret;
+
+		smu->current_power_limit = ppt_limit;
+		break;
+	case SMU_FAST_PPT_LIMIT:
+		ppt_limit &= ~(SMU_FAST_PPT_LIMIT << 24);
+		if (ppt_limit > power_context->max_fast_ppt_limit) {
+			dev_err(smu->adev->dev,
+				"New power limit (%d) is over the max allowed %d\n",
+				ppt_limit, power_context->max_fast_ppt_limit);
+			return ret;
+		}
+
+		ret = smu_cmn_send_smc_msg_with_param(smu,
+				SMU_MSG_SetFastPPTLimit,
+				ppt_limit * 1000, /* convert from watt to milliwatt */
+				NULL);
+		if (ret)
+			return ret;
+
+		power_context->current_fast_ppt_limit = ppt_limit;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
 static const struct pptable_funcs vangogh_ppt_funcs = {
 
 	.check_fw_status = smu_v11_0_check_fw_status,
@@ -1809,6 +1919,9 @@ static const struct pptable_funcs vangogh_ppt_funcs = {
 	.post_init = vangogh_post_smu_init,
 	.mode2_reset = vangogh_mode2_reset,
 	.gfx_off_control = smu_v11_0_gfx_off_control,
+	.get_ppt_limit = vangogh_get_ppt_limit,
+	.get_power_limit = vangogh_get_power_limit,
+	.set_power_limit = vangogh_set_power_limit,
 };
 
 void vangogh_set_ppt_funcs(struct smu_context *smu)