drm/amdgpu: move gtt usage tracking into the gtt manager v2

It doesn't make much sense to count those numbers twice.

v2: use and atomic64_t instead
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1484,7 +1484,6 @@ struct amdgpu_device {
 	struct amdgpu_wb		wb;
 	atomic64_t			vram_usage;
 	atomic64_t			vram_vis_usage;
-	atomic64_t			gtt_usage;
 	atomic64_t			num_bytes_moved;
 	atomic64_t			num_evictions;
 	atomic64_t			num_vram_cpu_page_faults;

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

@@ -28,7 +28,7 @@
 struct amdgpu_gtt_mgr {
 	struct drm_mm mm;
 	spinlock_t lock;
-	uint64_t available;
+	atomic64_t available;
 };
 
 /**
@@ -54,7 +54,7 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
 	size = (adev->mc.gart_size >> PAGE_SHIFT) - start;
 	drm_mm_init(&mgr->mm, start, size);
 	spin_lock_init(&mgr->lock);
-	mgr->available = p_size;
+	atomic64_set(&mgr->available, p_size);
 	man->priv = mgr;
 	return 0;
 }
@@ -173,11 +173,11 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
 	int r;
 
 	spin_lock(&mgr->lock);
-	if (mgr->available < mem->num_pages) {
+	if (atomic64_read(&mgr->available) < mem->num_pages) {
 		spin_unlock(&mgr->lock);
 		return 0;
 	}
-	mgr->available -= mem->num_pages;
+	atomic64_sub(mem->num_pages, &mgr->available);
 	spin_unlock(&mgr->lock);
 
 	node = kzalloc(sizeof(*node), GFP_KERNEL);
@@ -204,9 +204,7 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
 
 	return 0;
 err_out:
-	spin_lock(&mgr->lock);
-	mgr->available += mem->num_pages;
-	spin_unlock(&mgr->lock);
+	atomic64_add(mem->num_pages, &mgr->available);
 
 	return r;
 }
@@ -233,13 +231,27 @@ static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
 	spin_lock(&mgr->lock);
 	if (node->start != AMDGPU_BO_INVALID_OFFSET)
 		drm_mm_remove_node(node);
-	mgr->available += mem->num_pages;
 	spin_unlock(&mgr->lock);
+	atomic64_add(mem->num_pages, &mgr->available);
 
 	kfree(node);
 	mem->mm_node = NULL;
 }
 
+/**
+ * amdgpu_gtt_mgr_usage - return usage of GTT domain
+ *
+ * @man: TTM memory type manager
+ *
+ * Return how many bytes are used in the GTT domain
+ */
+uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
+{
+	struct amdgpu_gtt_mgr *mgr = man->priv;
+
+	return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_SIZE;
+}
+
 /**
  * amdgpu_gtt_mgr_debug - dump VRAM table
  *
@@ -251,7 +263,6 @@ static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
 				 struct drm_printer *printer)
 {
-	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_gtt_mgr *mgr = man->priv;
 
 	spin_lock(&mgr->lock);
@@ -259,8 +270,8 @@ static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
 	spin_unlock(&mgr->lock);
 
 	drm_printf(printer, "man size:%llu pages, gtt available:%llu pages, usage:%lluMB\n",
-		   man->size, mgr->available,
-		   (u64)atomic64_read(&adev->gtt_usage) >> 20);
+		   man->size, (u64)atomic64_read(&mgr->available),
+		   amdgpu_gtt_mgr_usage(man) >> 20);
 }
 
 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {

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

@@ -461,7 +461,7 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		ui64 = atomic64_read(&adev->vram_vis_usage);
 		return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0;
 	case AMDGPU_INFO_GTT_USAGE:
-		ui64 = atomic64_read(&adev->gtt_usage);
+		ui64 = amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]);
 		return copy_to_user(out, &ui64, min(size, 8u)) ? -EFAULT : 0;
 	case AMDGPU_INFO_GDS_CONFIG: {
 		struct drm_amdgpu_info_gds gds_info;
@@ -514,7 +514,8 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		mem.gtt.total_heap_size *= PAGE_SIZE;
 		mem.gtt.usable_heap_size = mem.gtt.total_heap_size
 			- adev->gart_pin_size;
-		mem.gtt.heap_usage = atomic64_read(&adev->gtt_usage);
+		mem.gtt.heap_usage =
+			amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]);
 		mem.gtt.max_allocation = mem.gtt.usable_heap_size * 3 / 4;
 
 		return copy_to_user(out, &mem,

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

@@ -62,7 +62,6 @@ static void amdgpu_update_memory_usage(struct amdgpu_device *adev,
 	if (new_mem) {
 		switch (new_mem->mem_type) {
 		case TTM_PL_TT:
-			atomic64_add(new_mem->size, &adev->gtt_usage);
 			break;
 		case TTM_PL_VRAM:
 			atomic64_add(new_mem->size, &adev->vram_usage);
@@ -75,7 +74,6 @@ static void amdgpu_update_memory_usage(struct amdgpu_device *adev,
 	if (old_mem) {
 		switch (old_mem->mem_type) {
 		case TTM_PL_TT:
-			atomic64_sub(old_mem->size, &adev->gtt_usage);
 			break;
 		case TTM_PL_VRAM:
 			atomic64_sub(old_mem->size, &adev->vram_usage);

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h

@@ -66,6 +66,7 @@ int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
 			 struct ttm_buffer_object *tbo,
 			 const struct ttm_place *place,
 			 struct ttm_mem_reg *mem);
+uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man);
 
 int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
 		       uint64_t dst_offset, uint32_t byte_count,