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