drm/ttm: cleanup ttm_mem_type_manager_func.get_node interface v3

Instead of signaling failure by setting the node pointer to
NULL do so by returning -ENOSPC.

v2: add memset() to make sure that mem is always initialized.
v3: drop memset() only set mm_node = NULL, move mm_node init in amdgpu

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/373181/

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
index 6271044..2c20d23 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -229,7 +229,7 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
        if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
            atomic64_read(&mgr->available) < mem->num_pages) {
                spin_unlock(&mgr->lock);
-               return 0;
+               return -ENOSPC;
        }
        atomic64_sub(mem->num_pages, &mgr->available);
        spin_unlock(&mgr->lock);
@@ -250,7 +250,6 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
                if (unlikely(r)) {
                        kfree(node);
                        mem->mm_node = NULL;
-                       r = 0;
                        goto err_out;
                }
        } else {

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index d399e58..ad5732f 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -319,8 +319,7 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
        mem_bytes = (u64)mem->num_pages << PAGE_SHIFT;
        if (atomic64_add_return(mem_bytes, &mgr->usage) > max_bytes) {
                atomic64_sub(mem_bytes, &mgr->usage);
-               mem->mm_node = NULL;
-               return 0;
+               return -ENOSPC;
        }
 
        if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
@@ -400,7 +399,7 @@ error:
        atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage);
 
        kvfree(nodes);
-       return r == -ENOSPC ? 0 : r;
+       return r;
 }
 
 /**

diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c b/drivers/gpu/drm/nouveau/nouveau_ttm.c
index 7ca0a24..e89ea05 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -75,10 +75,6 @@ nouveau_vram_manager_new(struct ttm_mem_type_manager *man,
        ret = nouveau_mem_vram(reg, nvbo->contig, nvbo->page);
        if (ret) {
                nouveau_mem_del(reg);
-               if (ret == -ENOSPC) {
-                       reg->mm_node = NULL;
-                       return 0;
-               }
                return ret;
        }
 
@@ -139,10 +135,6 @@ nv04_gart_manager_new(struct ttm_mem_type_manager *man,
                           reg->num_pages << PAGE_SHIFT, &mem->vma[0]);
        if (ret) {
                nouveau_mem_del(reg);
-               if (ret == -ENOSPC) {
-                       reg->mm_node = NULL;
-                       return 0;
-               }
                return ret;
        }
 

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index f78cfc7..2da8dbd 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -909,10 +909,10 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
        ticket = dma_resv_locking_ctx(bo->base.resv);
        do {
                ret = (*man->func->get_node)(man, bo, place, mem);
-               if (unlikely(ret != 0))
-                       return ret;
-               if (mem->mm_node)
+               if (likely(!ret))
                        break;
+               if (unlikely(ret != -ENOSPC))
+                       return ret;
                ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
                                          ticket);
                if (unlikely(ret != 0))
@@ -1056,12 +1056,11 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 
                man = &bdev->man[mem->mem_type];
                ret = (*man->func->get_node)(man, bo, place, mem);
+               if (ret == -ENOSPC)
+                       continue;
                if (unlikely(ret))
                        goto error;
 
-               if (!mem->mm_node)
-                       continue;
-
                ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
                if (unlikely(ret)) {
                        (*man->func->put_node)(man, mem);
@@ -1126,6 +1125,8 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
        mem.page_alignment = bo->mem.page_alignment;
        mem.bus.io_reserved_vm = false;
        mem.bus.io_reserved_count = 0;
+       mem.mm_node = NULL;
+
        /*
         * Determine where to move the buffer.
         */

diff --git a/drivers/gpu/drm/ttm/ttm_bo_manager.c b/drivers/gpu/drm/ttm/ttm_bo_manager.c
index 18d3deb..facd304 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_manager.c
@@ -86,7 +86,7 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
                mem->start = node->start;
        }
 
-       return 0;
+       return ret;
 }
 
 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
index 7da752c..4a76fc7 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
@@ -53,8 +53,6 @@ static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
                (struct vmwgfx_gmrid_man *)man->priv;
        int id;
 
-       mem->mm_node = NULL;
-
        id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
        if (id < 0)
                return (id != -ENOMEM ? 0 : id);
@@ -78,7 +76,7 @@ nospace:
        gman->used_gmr_pages -= bo->num_pages;
        spin_unlock(&gman->lock);
        ida_free(&gman->gmr_ida, id);
-       return 0;
+       return -ENOSPC;
 }
 
 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,