drm/amdgpu/pm: Fix NULL pointer dereference when get power limit

Because powerplay_table initialization is skipped under
sriov case, We check and set default lower and upper OD
value if powerplay_table is NULL.

Fixes: 7968e9748fbb ("drm/amdgpu/pm: Fix the power1_min_cap value")
Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Reported-by: Yin Zhenguo <zhenguo.yin@amd.com>
Suggested-by: Lazar Lijo <lijo.lazar@amd.com>
Suggested-by: Alex Deucher <Alexander.Deucher@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

5 files changed, 41 insertions, 31 deletions

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
index 1d96eb274d72d..a406372e79d86 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
@@ -1286,7 +1286,7 @@ static int arcturus_get_power_limit(struct smu_context *smu,
 	struct smu_11_0_powerplay_table *powerplay_table =
 		(struct smu_11_0_powerplay_table *)smu->smu_table.power_play_table;
 	PPTable_t *pptable = smu->smu_table.driver_pptable;
-	uint32_t power_limit, od_percent_upper, od_percent_lower;
+	uint32_t power_limit, od_percent_upper = 0, od_percent_lower = 0;
 
 	if (smu_v11_0_get_current_power_limit(smu, &power_limit)) {
 		/* the last hope to figure out the ppt limit */
@@ -1303,12 +1303,14 @@ static int arcturus_get_power_limit(struct smu_context *smu,
 	if (default_power_limit)
 		*default_power_limit = power_limit;
 
-	if (smu->od_enabled)
-		od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
-	else
-		od_percent_upper = 0;
+	if (powerplay_table) {
+		if (smu->od_enabled)
+			od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+		else
+			od_percent_upper = 0;
 
-	od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+		od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+	}
 
 	dev_dbg(smu->adev->dev, "od percent upper:%d, od percent lower:%d (default power: %d)\n",
 							od_percent_upper, od_percent_lower, power_limit);
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
index ed189a3878ebe..65bba5fc2335e 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
@@ -2339,7 +2339,7 @@ static int navi10_get_power_limit(struct smu_context *smu,
 		(struct smu_11_0_powerplay_table *)smu->smu_table.power_play_table;
 	struct smu_11_0_overdrive_table *od_settings = smu->od_settings;
 	PPTable_t *pptable = smu->smu_table.driver_pptable;
-	uint32_t power_limit, od_percent_upper, od_percent_lower;
+	uint32_t power_limit, od_percent_upper = 0, od_percent_lower = 0;
 
 	if (smu_v11_0_get_current_power_limit(smu, &power_limit)) {
 		/* the last hope to figure out the ppt limit */
@@ -2356,13 +2356,15 @@ static int navi10_get_power_limit(struct smu_context *smu,
 	if (default_power_limit)
 		*default_power_limit = power_limit;
 
-	if (smu->od_enabled &&
-		    navi10_od_feature_is_supported(od_settings, SMU_11_0_ODCAP_POWER_LIMIT))
-		od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
-	else
-		od_percent_upper = 0;
+	if (powerplay_table) {
+		if (smu->od_enabled &&
+			    navi10_od_feature_is_supported(od_settings, SMU_11_0_ODCAP_POWER_LIMIT))
+			od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+		else
+			od_percent_upper = 0;
 
-	od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+		od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_ODSETTING_POWERPERCENTAGE]);
+	}
 
 	dev_dbg(smu->adev->dev, "od percent upper:%d, od percent lower:%d (default power: %d)\n",
 					od_percent_upper, od_percent_lower, power_limit);
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
index e2ad2b972ab0b..395718b48131b 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
@@ -625,7 +625,7 @@ static int sienna_cichlid_get_power_limit(struct smu_context *smu,
 {
 	struct smu_11_0_7_powerplay_table *powerplay_table =
 		(struct smu_11_0_7_powerplay_table *)smu->smu_table.power_play_table;
-	uint32_t power_limit, od_percent_upper, od_percent_lower;
+	uint32_t power_limit, od_percent_upper = 0, od_percent_lower = 0;
 	uint16_t *table_member;
 
 	GET_PPTABLE_MEMBER(SocketPowerLimitAc, &table_member);
@@ -640,12 +640,14 @@ static int sienna_cichlid_get_power_limit(struct smu_context *smu,
 	if (default_power_limit)
 		*default_power_limit = power_limit;
 
-	if (smu->od_enabled)
-		od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_7_ODSETTING_POWERPERCENTAGE]);
-	else
-		od_percent_upper = 0;
+	if (powerplay_table) {
+		if (smu->od_enabled)
+			od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_11_0_7_ODSETTING_POWERPERCENTAGE]);
+		else
+			od_percent_upper = 0;
 
-	od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_7_ODSETTING_POWERPERCENTAGE]);
+		od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_11_0_7_ODSETTING_POWERPERCENTAGE]);
+	}
 
 	dev_dbg(smu->adev->dev, "od percent upper:%d, od percent lower:%d (default power: %d)\n",
 					od_percent_upper, od_percent_lower, power_limit);
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
index 9b80f18ea6c35..7873f024d4294 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
@@ -2356,7 +2356,7 @@ static int smu_v13_0_0_get_power_limit(struct smu_context *smu,
 		(struct smu_13_0_0_powerplay_table *)table_context->power_play_table;
 	PPTable_t *pptable = table_context->driver_pptable;
 	SkuTable_t *skutable = &pptable->SkuTable;
-	uint32_t power_limit, od_percent_upper, od_percent_lower;
+	uint32_t power_limit, od_percent_upper = 0, od_percent_lower = 0;
 	uint32_t msg_limit = skutable->MsgLimits.Power[PPT_THROTTLER_PPT0][POWER_SOURCE_AC];
 
 	if (smu_v13_0_get_current_power_limit(smu, &power_limit))
@@ -2369,12 +2369,14 @@ static int smu_v13_0_0_get_power_limit(struct smu_context *smu,
 	if (default_power_limit)
 		*default_power_limit = power_limit;
 
-	if (smu->od_enabled)
-		od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_13_0_0_ODSETTING_POWERPERCENTAGE]);
-	else
-		od_percent_upper = 0;
+	if (powerplay_table) {
+		if (smu->od_enabled)
+			od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_13_0_0_ODSETTING_POWERPERCENTAGE]);
+		else
+			od_percent_upper = 0;
 
-	od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_13_0_0_ODSETTING_POWERPERCENTAGE]);
+		od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_13_0_0_ODSETTING_POWERPERCENTAGE]);
+	}
 
 	dev_dbg(smu->adev->dev, "od percent upper:%d, od percent lower:%d (default power: %d)\n",
 					od_percent_upper, od_percent_lower, power_limit);
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
index 3dc7b60cb0754..8abf0a772e6b0 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
@@ -2320,7 +2320,7 @@ static int smu_v13_0_7_get_power_limit(struct smu_context *smu,
 		(struct smu_13_0_7_powerplay_table *)table_context->power_play_table;
 	PPTable_t *pptable = table_context->driver_pptable;
 	SkuTable_t *skutable = &pptable->SkuTable;
-	uint32_t power_limit, od_percent_upper, od_percent_lower;
+	uint32_t power_limit, od_percent_upper = 0, od_percent_lower = 0;
 	uint32_t msg_limit = skutable->MsgLimits.Power[PPT_THROTTLER_PPT0][POWER_SOURCE_AC];
 
 	if (smu_v13_0_get_current_power_limit(smu, &power_limit))
@@ -2333,12 +2333,14 @@ static int smu_v13_0_7_get_power_limit(struct smu_context *smu,
 	if (default_power_limit)
 		*default_power_limit = power_limit;
 
-	if (smu->od_enabled)
-		od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_13_0_7_ODSETTING_POWERPERCENTAGE]);
-	else
-		od_percent_upper = 0;
+	if (powerplay_table) {
+		if (smu->od_enabled)
+			od_percent_upper = le32_to_cpu(powerplay_table->overdrive_table.max[SMU_13_0_7_ODSETTING_POWERPERCENTAGE]);
+		else
+			od_percent_upper = 0;
 
-	od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_13_0_7_ODSETTING_POWERPERCENTAGE]);
+		od_percent_lower = le32_to_cpu(powerplay_table->overdrive_table.min[SMU_13_0_7_ODSETTING_POWERPERCENTAGE]);
+	}
 
 	dev_dbg(smu->adev->dev, "od percent upper:%d, od percent lower:%d (default power: %d)\n",
 					od_percent_upper, od_percent_lower, power_limit);