drm/amdgpu: remove VRAM accounting v2

This is provided by TTM now.

Also switch man->size to bytes instead of pages and fix the double
printing of size and usage in debugfs.

v2: fix size checking as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220214093439.2989-8-christian.koenig@amd.com

1 files changed, 21 insertions, 37 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 7442095f089c..e50fe25fbcb8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -96,9 +96,9 @@ static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = drm_to_adev(ddev);
+	struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
 
-	return sysfs_emit(buf, "%llu\n",
-			  amdgpu_vram_mgr_usage(&adev->mman.vram_mgr));
+	return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
 }
 
 /**
@@ -253,7 +253,9 @@ static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
 
 		vis_usage = amdgpu_vram_mgr_vis_size(adev, &rsv->mm_node);
 		atomic64_add(vis_usage, &mgr->vis_usage);
-		atomic64_add(rsv->mm_node.size << PAGE_SHIFT, &mgr->usage);
+		spin_lock(&man->bdev->lru_lock);
+		man->usage += rsv->mm_node.size << PAGE_SHIFT;
+		spin_unlock(&man->bdev->lru_lock);
 		list_move(&rsv->node, &mgr->reserved_pages);
 	}
 }
@@ -378,19 +380,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 
 	lpfn = place->lpfn;
 	if (!lpfn)
-		lpfn = man->size;
+		lpfn = man->size >> PAGE_SHIFT;
 
 	max_bytes = adev->gmc.mc_vram_size;
 	if (tbo->type != ttm_bo_type_kernel)
 		max_bytes -= AMDGPU_VM_RESERVED_VRAM;
 
-	/* bail out quickly if there's likely not enough VRAM for this BO */
 	mem_bytes = tbo->base.size;
-	if (atomic64_add_return(mem_bytes, &mgr->usage) > max_bytes) {
-		r = -ENOSPC;
-		goto error_sub;
-	}
-
 	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 		pages_per_node = ~0ul;
 		num_nodes = 1;
@@ -408,13 +404,17 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 
 	node = kvmalloc(struct_size(node, mm_nodes, num_nodes),
 			GFP_KERNEL | __GFP_ZERO);
-	if (!node) {
-		r = -ENOMEM;
-		goto error_sub;
-	}
+	if (!node)
+		return -ENOMEM;
 
 	ttm_resource_init(tbo, place, &node->base);
 
+	/* bail out quickly if there's likely not enough VRAM for this BO */
+	if (ttm_resource_manager_usage(man) > max_bytes) {
+		r = -ENOSPC;
+		goto error_fini;
+	}
+
 	mode = DRM_MM_INSERT_BEST;
 	if (place->flags & TTM_PL_FLAG_TOPDOWN)
 		mode = DRM_MM_INSERT_HIGH;
@@ -472,11 +472,10 @@ error_free:
 	while (i--)
 		drm_mm_remove_node(&node->mm_nodes[i]);
 	spin_unlock(&mgr->lock);
+error_fini:
 	ttm_resource_fini(man, &node->base);
 	kvfree(node);
 
-error_sub:
-	atomic64_sub(mem_bytes, &mgr->usage);
 	return r;
 }
 
@@ -494,7 +493,7 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 	struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
 	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 	struct amdgpu_device *adev = to_amdgpu_device(mgr);
-	uint64_t usage = 0, vis_usage = 0;
+	uint64_t vis_usage = 0;
 	unsigned i, pages;
 
 	spin_lock(&mgr->lock);
@@ -503,13 +502,11 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 		struct drm_mm_node *mm = &node->mm_nodes[i];
 
 		drm_mm_remove_node(mm);
-		usage += mm->size << PAGE_SHIFT;
 		vis_usage += amdgpu_vram_mgr_vis_size(adev, mm);
 	}
 	amdgpu_vram_mgr_do_reserve(man);
 	spin_unlock(&mgr->lock);
 
-	atomic64_sub(usage, &mgr->usage);
 	atomic64_sub(vis_usage, &mgr->vis_usage);
 
 	ttm_resource_fini(man, res);
@@ -628,18 +625,6 @@ void amdgpu_vram_mgr_free_sgt(struct device *dev,
 }
 
 /**
- * amdgpu_vram_mgr_usage - how many bytes are used in this domain
- *
- * @mgr: amdgpu_vram_mgr pointer
- *
- * Returns how many bytes are used in this domain.
- */
-uint64_t amdgpu_vram_mgr_usage(struct amdgpu_vram_mgr *mgr)
-{
-	return atomic64_read(&mgr->usage);
-}
-
-/**
  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
  *
  * @mgr: amdgpu_vram_mgr pointer
@@ -664,13 +649,12 @@ static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
 {
 	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 
+	drm_printf(printer, "  vis usage:%llu\n",
+		   amdgpu_vram_mgr_vis_usage(mgr));
+
 	spin_lock(&mgr->lock);
 	drm_mm_print(&mgr->mm, printer);
 	spin_unlock(&mgr->lock);
-
-	drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
-		   man->size, amdgpu_vram_mgr_usage(mgr) >> 20,
-		   amdgpu_vram_mgr_vis_usage(mgr) >> 20);
 }
 
 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
@@ -692,11 +676,11 @@ int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
 	struct ttm_resource_manager *man = &mgr->manager;
 
 	ttm_resource_manager_init(man, &adev->mman.bdev,
-				  adev->gmc.real_vram_size >> PAGE_SHIFT);
+				  adev->gmc.real_vram_size);
 
 	man->func = &amdgpu_vram_mgr_func;
 
-	drm_mm_init(&mgr->mm, 0, man->size);
+	drm_mm_init(&mgr->mm, 0, man->size >> PAGE_SHIFT);
 	spin_lock_init(&mgr->lock);
 	INIT_LIST_HEAD(&mgr->reservations_pending);
 	INIT_LIST_HEAD(&mgr->reserved_pages);