drm/amdgpu: Add sysfs files for returning VRAM/GTT info v2

Add 6 files that return (in bytes):
The total amount of VRAM/visible VRAM/GTT
and the current total used VRAM/visible VRAM/GTT

v2: Split used and total into separate files
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c

@@ -36,6 +36,47 @@ struct amdgpu_gtt_node {
 	struct ttm_buffer_object *tbo;
 };
 
+/**
+ * DOC: mem_info_gtt_total
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total size of
+ * the GTT.
+ * The file mem_info_gtt_total is used for this, and returns the total size of
+ * the GTT block, in bytes
+ */
+static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			(adev->mman.bdev.man[TTM_PL_TT].size) * PAGE_SIZE);
+}
+
+/**
+ * DOC: mem_info_gtt_used
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total amount of
+ * used GTT.
+ * The file mem_info_gtt_used is used for this, and returns the current used
+ * size of the GTT block, in bytes
+ */
+static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]));
+}
+
+static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
+	           amdgpu_mem_info_gtt_total_show, NULL);
+static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
+	           amdgpu_mem_info_gtt_used_show, NULL);
+
 /**
  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
  *
@@ -50,6 +91,7 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
 	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_gtt_mgr *mgr;
 	uint64_t start, size;
+	int ret;
 
 	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 	if (!mgr)
@@ -61,6 +103,18 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
 	spin_lock_init(&mgr->lock);
 	atomic64_set(&mgr->available, p_size);
 	man->priv = mgr;
+
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
+		return ret;
+	}
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
+		return ret;
+	}
+
 	return 0;
 }
 
@@ -74,12 +128,17 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
  */
 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
 {
+	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_gtt_mgr *mgr = man->priv;
 	spin_lock(&mgr->lock);
 	drm_mm_takedown(&mgr->mm);
 	spin_unlock(&mgr->lock);
 	kfree(mgr);
 	man->priv = NULL;
+
+	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
+	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
+
 	return 0;
 }
 

drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

@@ -32,6 +32,85 @@ struct amdgpu_vram_mgr {
 	atomic64_t vis_usage;
 };
 
+/**
+ * DOC: mem_info_vram_total
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total VRAM
+ * available on the device
+ * The file mem_info_vram_total is used for this and returns the total
+ * amount of VRAM in bytes
+ */
+static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.real_vram_size);
+}
+
+/**
+ * DOC: mem_info_vis_vram_total
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total
+ * visible VRAM available on the device
+ * The file mem_info_vis_vram_total is used for this and returns the total
+ * amount of visible VRAM in bytes
+ */
+static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.visible_vram_size);
+}
+
+/**
+ * DOC: mem_info_vram_used
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total VRAM
+ * available on the device
+ * The file mem_info_vram_used is used for this and returns the total
+ * amount of currently used VRAM in bytes
+ */
+static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+		amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
+}
+
+/**
+ * DOC: mem_info_vis_vram_used
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total of
+ * used visible VRAM
+ * The file mem_info_vis_vram_used is used for this and returns the total
+ * amount of currently used visible VRAM in bytes
+ */
+static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+		amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
+}
+
+static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
+		   amdgpu_mem_info_vram_total_show, NULL);
+static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
+		   amdgpu_mem_info_vis_vram_total_show,NULL);
+static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
+		   amdgpu_mem_info_vram_used_show, NULL);
+static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
+		   amdgpu_mem_info_vis_vram_used_show, NULL);
+
 /**
  * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
  *
@@ -43,7 +122,9 @@ struct amdgpu_vram_mgr {
 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
 				unsigned long p_size)
 {
+	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_vram_mgr *mgr;
+	int ret;
 
 	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 	if (!mgr)
@@ -52,6 +133,29 @@ static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
 	drm_mm_init(&mgr->mm, 0, p_size);
 	spin_lock_init(&mgr->lock);
 	man->priv = mgr;
+
+	/* Add the two VRAM-related sysfs files */
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_vram_total\n");
+		return ret;
+	}
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
+		return ret;
+	}
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_vram_used\n");
+		return ret;
+	}
+	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
+	if (ret) {
+		DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
+		return ret;
+	}
+
 	return 0;
 }
 
@@ -65,6 +169,7 @@ static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
  */
 static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
 {
+	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_vram_mgr *mgr = man->priv;
 
 	spin_lock(&mgr->lock);
@@ -72,6 +177,10 @@ static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
 	spin_unlock(&mgr->lock);
 	kfree(mgr);
 	man->priv = NULL;
+	device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
+	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
+	device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
+	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
 	return 0;
 }