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(gem: _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(fb_modifier: 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(fb_modifier: 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(dev: drm);
86 struct drm_i915_gem_object *obj;
87
88 obj = i915_gem_object_lookup(file: filp, handle: mode_cmd->handles[0]);
89 if (!obj)
90 return ERR_PTR(error: -ENOENT);
91
92 /* object is backed with LMEM for discrete */
93 if (HAS_LMEM(i915) && !i915_gem_object_can_migrate(obj, id: 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(error: -EREMOTE);
98 }
99
100 return intel_bo_to_drm_bo(obj);
101}
102

source code of linux/drivers/gpu/drm/i915/display/intel_fb_bo.c