From: Thomas Hellstrom Date: Wed, 26 Sep 2018 14:27:54 +0000 (+0200) Subject: drm/vmwgfx: Make buffer object lookups reference-free during validation X-Git-Tag: v5.15~7708^2~16^2~3 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b139d43dacef688a4f46f29eef34409e950f7cef;p=mirror_ubuntu-kernels.git drm/vmwgfx: Make buffer object lookups reference-free during validation Make the process of looking up a buffer object and adding it to the validation list reference-free unless when it's actually added to the validation list where a single reference is taken. This saves two locked atomic operations per command stream buffer object handle lookup. Signed-off-by: Thomas Hellstrom Reviewed-by: Sinclair Yeh --- diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c index 641b75110dc6..15e83b39e26d 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c @@ -1137,7 +1137,7 @@ static void vmw_query_bo_switch_commit(struct vmw_private *dev_priv, * @sw_context: The software context used for this command batch validation. * @id: Pointer to the user-space handle to be translated. * @vmw_bo_p: Points to a location that, on successful return will carry - * a reference-counted pointer to the DMA buffer identified by the + * a non-reference-counted pointer to the buffer object identified by the * user-space handle in @id. * * This function saves information needed to translate a user-space buffer @@ -1152,38 +1152,34 @@ static int vmw_translate_mob_ptr(struct vmw_private *dev_priv, SVGAMobId *id, struct vmw_buffer_object **vmw_bo_p) { - struct vmw_buffer_object *vmw_bo = NULL; + struct vmw_buffer_object *vmw_bo; uint32_t handle = *id; struct vmw_relocation *reloc; int ret; - ret = vmw_user_bo_lookup(sw_context->fp->tfile, handle, &vmw_bo, NULL); - if (unlikely(ret != 0)) { + vmw_validation_preload_bo(sw_context->ctx); + vmw_bo = vmw_user_bo_noref_lookup(sw_context->fp->tfile, handle); + if (IS_ERR(vmw_bo)) { DRM_ERROR("Could not find or use MOB buffer.\n"); - ret = -EINVAL; - goto out_no_reloc; + return PTR_ERR(vmw_bo); } + ret = vmw_validation_add_bo(sw_context->ctx, vmw_bo, true, false); + vmw_user_bo_noref_release(); + if (unlikely(ret != 0)) + return ret; + reloc = vmw_validation_mem_alloc(sw_context->ctx, sizeof(*reloc)); if (!reloc) - goto out_no_reloc; + return -ENOMEM; reloc->mob_loc = id; reloc->vbo = vmw_bo; - ret = vmw_validation_add_bo(sw_context->ctx, vmw_bo, true, false); - if (unlikely(ret != 0)) - goto out_no_reloc; - *vmw_bo_p = vmw_bo; list_add_tail(&reloc->head, &sw_context->bo_relocations); return 0; - -out_no_reloc: - vmw_bo_unreference(&vmw_bo); - *vmw_bo_p = NULL; - return ret; } /** @@ -1194,7 +1190,7 @@ out_no_reloc: * @sw_context: The software context used for this command batch validation. * @ptr: Pointer to the user-space handle to be translated. * @vmw_bo_p: Points to a location that, on successful return will carry - * a reference-counted pointer to the DMA buffer identified by the + * a non-reference-counted pointer to the DMA buffer identified by the * user-space handle in @id. * * This function saves information needed to translate a user-space buffer @@ -1210,38 +1206,33 @@ static int vmw_translate_guest_ptr(struct vmw_private *dev_priv, SVGAGuestPtr *ptr, struct vmw_buffer_object **vmw_bo_p) { - struct vmw_buffer_object *vmw_bo = NULL; + struct vmw_buffer_object *vmw_bo; uint32_t handle = ptr->gmrId; struct vmw_relocation *reloc; int ret; - ret = vmw_user_bo_lookup(sw_context->fp->tfile, handle, &vmw_bo, NULL); - if (unlikely(ret != 0)) { + vmw_validation_preload_bo(sw_context->ctx); + vmw_bo = vmw_user_bo_noref_lookup(sw_context->fp->tfile, handle); + if (IS_ERR(vmw_bo)) { DRM_ERROR("Could not find or use GMR region.\n"); - ret = -EINVAL; - goto out_no_reloc; + return PTR_ERR(vmw_bo); } + ret = vmw_validation_add_bo(sw_context->ctx, vmw_bo, false, false); + vmw_user_bo_noref_release(); + if (unlikely(ret != 0)) + return ret; + reloc = vmw_validation_mem_alloc(sw_context->ctx, sizeof(*reloc)); if (!reloc) - goto out_no_reloc; + return -ENOMEM; reloc->location = ptr; reloc->vbo = vmw_bo; - - ret = vmw_validation_add_bo(sw_context->ctx, vmw_bo, false, false); - if (unlikely(ret != 0)) - goto out_no_reloc; - *vmw_bo_p = vmw_bo; list_add_tail(&reloc->head, &sw_context->bo_relocations); return 0; - -out_no_reloc: - vmw_bo_unreference(&vmw_bo); - *vmw_bo_p = NULL; - return ret; } @@ -1328,10 +1319,7 @@ static int vmw_cmd_dx_bind_query(struct vmw_private *dev_priv, sw_context->dx_query_mob = vmw_bo; sw_context->dx_query_ctx = sw_context->dx_ctx_node->ctx; - - vmw_bo_unreference(&vmw_bo); - - return ret; + return 0; } @@ -1432,7 +1420,6 @@ static int vmw_cmd_end_gb_query(struct vmw_private *dev_priv, ret = vmw_query_bo_switch_prepare(dev_priv, vmw_bo, sw_context); - vmw_bo_unreference(&vmw_bo); return ret; } @@ -1486,7 +1473,6 @@ static int vmw_cmd_end_query(struct vmw_private *dev_priv, ret = vmw_query_bo_switch_prepare(dev_priv, vmw_bo, sw_context); - vmw_bo_unreference(&vmw_bo); return ret; } @@ -1519,7 +1505,6 @@ static int vmw_cmd_wait_gb_query(struct vmw_private *dev_priv, if (unlikely(ret != 0)) return ret; - vmw_bo_unreference(&vmw_bo); return 0; } @@ -1571,7 +1556,6 @@ static int vmw_cmd_wait_query(struct vmw_private *dev_priv, if (unlikely(ret != 0)) return ret; - vmw_bo_unreference(&vmw_bo); return 0; } @@ -1622,7 +1606,7 @@ static int vmw_cmd_dma(struct vmw_private *dev_priv, if (unlikely(ret != 0)) { if (unlikely(ret != -ERESTARTSYS)) DRM_ERROR("could not find surface for DMA.\n"); - goto out_no_surface; + return ret; } srf = vmw_res_to_srf(sw_context->res_cache[vmw_res_surface].res); @@ -1630,9 +1614,7 @@ static int vmw_cmd_dma(struct vmw_private *dev_priv, vmw_kms_cursor_snoop(srf, sw_context->fp->tfile, &vmw_bo->base, header); -out_no_surface: - vmw_bo_unreference(&vmw_bo); - return ret; + return 0; } static int vmw_cmd_draw(struct vmw_private *dev_priv, @@ -1763,14 +1745,9 @@ static int vmw_cmd_check_define_gmrfb(struct vmw_private *dev_priv, SVGAFifoCmdDefineGMRFB body; } *cmd = buf; - ret = vmw_translate_guest_ptr(dev_priv, sw_context, - &cmd->body.ptr, - &vmw_bo); - if (unlikely(ret != 0)) - return ret; - - vmw_bo_unreference(&vmw_bo); - + return vmw_translate_guest_ptr(dev_priv, sw_context, + &cmd->body.ptr, + &vmw_bo); return ret; } @@ -1810,8 +1787,6 @@ static int vmw_cmd_res_switch_backup(struct vmw_private *dev_priv, vmw_validation_res_switch_backup(sw_context->ctx, info, vbo, backup_offset); - vmw_bo_unreference(&vbo); - return 0; }