drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)

add pp_table sysfs interface for new sw-smu.
get: return pptable raw data
set: write pptable raw data to pptable, then reset smu (hw_fini -> hw_init)

v2: fix mutex lock issue

Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 77 insertions, 6 deletions

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index f35c2177d13d..f17c85fc61e9 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -76,6 +76,54 @@ bool is_support_sw_smu(struct amdgpu_device *adev)
 	return false;
 }
 
+int smu_sys_get_pp_table(struct smu_context *smu, void **table)
+{
+	struct smu_table_context *smu_table = &smu->smu_table;
+
+	if (!smu_table->power_play_table && !smu_table->hardcode_pptable)
+		return -EINVAL;
+
+	if (smu_table->hardcode_pptable)
+		*table = smu_table->hardcode_pptable;
+	else
+		*table = smu_table->power_play_table;
+
+	return smu_table->power_play_table_size;
+}
+
+int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size)
+{
+	struct smu_table_context *smu_table = &smu->smu_table;
+	ATOM_COMMON_TABLE_HEADER *header = (ATOM_COMMON_TABLE_HEADER *)buf;
+	int ret = 0;
+
+	if (header->usStructureSize != size) {
+		pr_err("pp table size not matched !\n");
+		return -EIO;
+	}
+
+	mutex_lock(&smu->mutex);
+	if (!smu_table->hardcode_pptable)
+		smu_table->hardcode_pptable = kzalloc(size, GFP_KERNEL);
+	if (!smu_table->hardcode_pptable) {
+		ret = -ENOMEM;
+		goto failed;
+	}
+
+	memcpy(smu_table->hardcode_pptable, buf, size);
+	smu_table->power_play_table = smu_table->hardcode_pptable;
+	smu_table->power_play_table_size = size;
+	mutex_unlock(&smu->mutex);
+
+	ret = smu_reset(smu);
+	if (ret)
+		pr_info("smu reset failed, ret = %d\n", ret);
+
+failed:
+	mutex_unlock(&smu->mutex);
+	return ret;
+}
+
 int smu_feature_init_dpm(struct smu_context *smu)
 {
 	struct smu_feature *feature = &smu->smu_feature;
@@ -328,7 +376,7 @@ static int smu_fini_fb_allocations(struct smu_context *smu)
 	uint32_t i = 0;
 
 	if (table_count == 0 || tables == NULL)
-		return -EINVAL;
+		return 0;
 
 	for (i = 0 ; i < table_count; i++) {
 		if (tables[i].size == 0)
@@ -590,9 +638,10 @@ static int smu_hw_fini(void *handle)
 	if (!is_support_sw_smu(adev))
 		return -EINVAL;
 
-	if (!table_context->driver_pptable)
-		return -EINVAL;
-	kfree(table_context->driver_pptable);
+	if (table_context->driver_pptable) {
+		kfree(table_context->driver_pptable);
+		table_context->driver_pptable = NULL;
+	}
 
 	if (table_context->max_sustainable_clocks) {
 		kfree(table_context->max_sustainable_clocks);
@@ -610,6 +659,22 @@ static int smu_hw_fini(void *handle)
 	return 0;
 }
 
+int smu_reset(struct smu_context *smu)
+{
+	struct amdgpu_device *adev = smu->adev;
+	int ret = 0;
+
+	ret = smu_hw_fini(adev);
+	if (ret)
+		return ret;
+
+	ret = smu_hw_init(adev);
+	if (ret)
+		return ret;
+
+	return ret;
+}
+
 static int smu_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
diff --git a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
index 43c2b9e981f5..11e7797e2fae 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
@@ -158,6 +158,7 @@ struct smu_table_context
 {
 	void				*power_play_table;
 	uint32_t			power_play_table_size;
+	void				*hardcode_pptable;
 
 	void				*max_sustainable_clocks;
 	struct smu_bios_boot_up_values	boot_values;
@@ -372,5 +373,8 @@ extern int smu_feature_set_supported(struct smu_context *smu, int feature_id, bo
 int smu_update_table(struct smu_context *smu, uint32_t table_id,
 		     void *table_data, bool drv2smu);
 bool is_support_sw_smu(struct amdgpu_device *adev);
+int smu_reset(struct smu_context *smu);
+int smu_sys_get_pp_table(struct smu_context *smu, void **table);
+int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size);
 
 #endif
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index e6b16b64a778..7ea19eb5896d 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -241,8 +241,10 @@ static int smu_v11_0_read_pptable_from_vbios(struct smu_context *smu)
 	if (ret)
 		return ret;
 
-	smu->smu_table.power_play_table = table;
-	smu->smu_table.power_play_table_size = size;
+	if (!smu->smu_table.power_play_table)
+		smu->smu_table.power_play_table = table;
+	if (!smu->smu_table.power_play_table_size)
+		smu->smu_table.power_play_table_size = size;
 
 	return 0;
 }