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_i915_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_i915_gem_object *obj,
21				 struct drm_mode_fb_cmd2 *mode_cmd)
22{
23	struct drm_i915_private *i915 = to_i915(obj->base.dev);
24	unsigned int tiling, stride;
25
26	i915_gem_object_lock(obj, NULL);
27	tiling = i915_gem_object_get_tiling(obj);
28	stride = i915_gem_object_get_stride(obj);
29	i915_gem_object_unlock(obj);
30
31	if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
32		/*
33		 * If there's a fence, enforce that
34		 * the fb modifier and tiling mode match.
35		 */
36		if (tiling != I915_TILING_NONE &&
37		    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
38			drm_dbg_kms(&i915->drm,
39				    "tiling_mode doesn't match fb modifier\n");
40			return -EINVAL;
41		}
42	} else {
43		if (tiling == I915_TILING_X) {
44			mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
45		} else if (tiling == I915_TILING_Y) {
46			drm_dbg_kms(&i915->drm,
47				    "No Y tiling for legacy addfb\n");
48			return -EINVAL;
49		}
50	}
51
52	/*
53	 * gen2/3 display engine uses the fence if present,
54	 * so the tiling mode must match the fb modifier exactly.
55	 */
56	if (DISPLAY_VER(i915) < 4 &&
57	    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
58		drm_dbg_kms(&i915->drm,
59			    "tiling_mode must match fb modifier exactly on gen2/3\n");
60		return -EINVAL;
61	}
62
63	/*
64	 * If there's a fence, enforce that
65	 * the fb pitch and fence stride match.
66	 */
67	if (tiling != I915_TILING_NONE && mode_cmd->pitches[0] != stride) {
68		drm_dbg_kms(&i915->drm,
69			    "pitch (%d) must match tiling stride (%d)\n",
70			    mode_cmd->pitches[0], stride);
71		return -EINVAL;
72	}
73
74	return 0;
75}
76
77struct drm_i915_gem_object *
78intel_fb_bo_lookup_valid_bo(struct drm_i915_private *i915,
79			    struct drm_file *filp,
80			    const struct drm_mode_fb_cmd2 *mode_cmd)
81{
82	struct drm_i915_gem_object *obj;
83
84	obj = i915_gem_object_lookup(filp, mode_cmd->handles[0]);
85	if (!obj)
86		return ERR_PTR(-ENOENT);
87
88	/* object is backed with LMEM for discrete */
89	if (HAS_LMEM(i915) && !i915_gem_object_can_migrate(obj, INTEL_REGION_LMEM_0)) {
90		/* object is "remote", not in local memory */
91		i915_gem_object_put(obj);
92		drm_dbg_kms(&i915->drm, "framebuffer must reside in local memory\n");
93		return ERR_PTR(-EREMOTE);
94	}
95
96	return obj;
97}