intel_fb_bo.c

  1/* SPDX-License-Identifier: MIT */
  2/*
  3 * Copyright © 2021 Intel Corporation
  4 */
  5
  6#include <drm/drm_framebuffer.h>
  7#include <drm/drm_print.h>
  8
  9#include "gem/i915_gem_object.h"
 10
 11#include "i915_drv.h"
 12#include "intel_display_core.h"
 13#include "intel_display_types.h"
 14#include "intel_fb.h"
 15#include "intel_fb_bo.h"
 16
 17void intel_fb_bo_framebuffer_fini(struct drm_gem_object *obj)
 18{
 19	/* Nothing to do for i915 */
 20}
 21
 22int intel_fb_bo_framebuffer_init(struct drm_gem_object *_obj,
 23				 struct drm_mode_fb_cmd2 *mode_cmd)
 24{
 25	struct drm_i915_gem_object *obj = to_intel_bo(_obj);
 26	struct intel_display *display = to_intel_display(obj->base.dev);
 27	unsigned int tiling, stride;
 28
 29	i915_gem_object_lock(obj, NULL);
 30	tiling = i915_gem_object_get_tiling(obj);
 31	stride = i915_gem_object_get_stride(obj);
 32	i915_gem_object_unlock(obj);
 33
 34	if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
 35		/*
 36		 * If there's a fence, enforce that
 37		 * the fb modifier and tiling mode match.
 38		 */
 39		if (tiling != I915_TILING_NONE &&
 40		    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
 41			drm_dbg_kms(display->drm,
 42				    "tiling_mode doesn't match fb modifier\n");
 43			return -EINVAL;
 44		}
 45	} else {
 46		if (tiling == I915_TILING_X) {
 47			mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
 48		} else if (tiling == I915_TILING_Y) {
 49			drm_dbg_kms(display->drm,
 50				    "No Y tiling for legacy addfb\n");
 51			return -EINVAL;
 52		}
 53	}
 54
 55	/*
 56	 * gen2/3 display engine uses the fence if present,
 57	 * so the tiling mode must match the fb modifier exactly.
 58	 */
 59	if (DISPLAY_VER(display) < 4 &&
 60	    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
 61		drm_dbg_kms(display->drm,
 62			    "tiling_mode must match fb modifier exactly on gen2/3\n");
 63		return -EINVAL;
 64	}
 65
 66	/*
 67	 * If there's a fence, enforce that
 68	 * the fb pitch and fence stride match.
 69	 */
 70	if (tiling != I915_TILING_NONE && mode_cmd->pitches[0] != stride) {
 71		drm_dbg_kms(display->drm,
 72			    "pitch (%d) must match tiling stride (%d)\n",
 73			    mode_cmd->pitches[0], stride);
 74		return -EINVAL;
 75	}
 76
 77	return 0;
 78}
 79
 80struct drm_gem_object *
 81intel_fb_bo_lookup_valid_bo(struct drm_device *drm,
 82			    struct drm_file *filp,
 83			    const struct drm_mode_fb_cmd2 *mode_cmd)
 84{
 85	struct drm_i915_private *i915 = to_i915(drm);
 86	struct drm_i915_gem_object *obj;
 87
 88	obj = i915_gem_object_lookup(filp, mode_cmd->handles[0]);
 89	if (!obj)
 90		return ERR_PTR(-ENOENT);
 91
 92	/* object is backed with LMEM for discrete */
 93	if (HAS_LMEM(i915) && !i915_gem_object_can_migrate(obj, INTEL_REGION_LMEM_0)) {
 94		/* object is "remote", not in local memory */
 95		i915_gem_object_put(obj);
 96		drm_dbg_kms(&i915->drm, "framebuffer must reside in local memory\n");
 97		return ERR_PTR(-EREMOTE);
 98	}
 99
100	return intel_bo_to_drm_bo(obj);
101}