1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2021 Intel Corporation
4 */
5
6 #include "intel_display_types.h"
7 #include "intel_plane_initial.h"
8 #include "intel_atomic_plane.h"
9 #include "intel_display.h"
10 #include "intel_fb.h"
11
12 static bool
intel_reuse_initial_plane_obj(struct drm_i915_private * i915,const struct intel_initial_plane_config * plane_config,struct drm_framebuffer ** fb,struct i915_vma ** vma)13 intel_reuse_initial_plane_obj(struct drm_i915_private *i915,
14 const struct intel_initial_plane_config *plane_config,
15 struct drm_framebuffer **fb,
16 struct i915_vma **vma)
17 {
18 struct intel_crtc *crtc;
19
20 for_each_intel_crtc(&i915->drm, crtc) {
21 struct intel_crtc_state *crtc_state =
22 to_intel_crtc_state(crtc->base.state);
23 struct intel_plane *plane =
24 to_intel_plane(crtc->base.primary);
25 struct intel_plane_state *plane_state =
26 to_intel_plane_state(plane->base.state);
27
28 if (!crtc_state->uapi.active)
29 continue;
30
31 if (!plane_state->ggtt_vma)
32 continue;
33
34 if (intel_plane_ggtt_offset(plane_state) == plane_config->base) {
35 *fb = plane_state->hw.fb;
36 *vma = plane_state->ggtt_vma;
37 return true;
38 }
39 }
40
41 return false;
42 }
43
44 static struct i915_vma *
initial_plane_vma(struct drm_i915_private * i915,struct intel_initial_plane_config * plane_config)45 initial_plane_vma(struct drm_i915_private *i915,
46 struct intel_initial_plane_config *plane_config)
47 {
48 struct drm_i915_gem_object *obj;
49 struct i915_vma *vma;
50 u32 base, size;
51
52 if (plane_config->size == 0)
53 return NULL;
54
55 base = round_down(plane_config->base,
56 I915_GTT_MIN_ALIGNMENT);
57 size = round_up(plane_config->base + plane_config->size,
58 I915_GTT_MIN_ALIGNMENT);
59 size -= base;
60
61 /*
62 * If the FB is too big, just don't use it since fbdev is not very
63 * important and we should probably use that space with FBC or other
64 * features.
65 */
66 if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
67 size * 2 > i915->stolen_usable_size)
68 return NULL;
69
70 obj = i915_gem_object_create_stolen_for_preallocated(i915, base, size);
71 if (IS_ERR(obj))
72 return NULL;
73
74 /*
75 * Mark it WT ahead of time to avoid changing the
76 * cache_level during fbdev initialization. The
77 * unbind there would get stuck waiting for rcu.
78 */
79 i915_gem_object_set_cache_coherency(obj, HAS_WT(i915) ?
80 I915_CACHE_WT : I915_CACHE_NONE);
81
82 switch (plane_config->tiling) {
83 case I915_TILING_NONE:
84 break;
85 case I915_TILING_X:
86 case I915_TILING_Y:
87 obj->tiling_and_stride =
88 plane_config->fb->base.pitches[0] |
89 plane_config->tiling;
90 break;
91 default:
92 MISSING_CASE(plane_config->tiling);
93 goto err_obj;
94 }
95
96 vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
97 if (IS_ERR(vma))
98 goto err_obj;
99
100 if (i915_ggtt_pin(vma, NULL, 0, PIN_MAPPABLE | PIN_OFFSET_FIXED | base))
101 goto err_obj;
102
103 if (i915_gem_object_is_tiled(obj) &&
104 !i915_vma_is_map_and_fenceable(vma))
105 goto err_obj;
106
107 return vma;
108
109 err_obj:
110 i915_gem_object_put(obj);
111 return NULL;
112 }
113
114 static bool
intel_alloc_initial_plane_obj(struct intel_crtc * crtc,struct intel_initial_plane_config * plane_config)115 intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
116 struct intel_initial_plane_config *plane_config)
117 {
118 struct drm_device *dev = crtc->base.dev;
119 struct drm_i915_private *dev_priv = to_i915(dev);
120 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
121 struct drm_framebuffer *fb = &plane_config->fb->base;
122 struct i915_vma *vma;
123
124 switch (fb->modifier) {
125 case DRM_FORMAT_MOD_LINEAR:
126 case I915_FORMAT_MOD_X_TILED:
127 case I915_FORMAT_MOD_Y_TILED:
128 break;
129 default:
130 drm_dbg(&dev_priv->drm,
131 "Unsupported modifier for initial FB: 0x%llx\n",
132 fb->modifier);
133 return false;
134 }
135
136 vma = initial_plane_vma(dev_priv, plane_config);
137 if (!vma)
138 return false;
139
140 mode_cmd.pixel_format = fb->format->format;
141 mode_cmd.width = fb->width;
142 mode_cmd.height = fb->height;
143 mode_cmd.pitches[0] = fb->pitches[0];
144 mode_cmd.modifier[0] = fb->modifier;
145 mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
146
147 if (intel_framebuffer_init(to_intel_framebuffer(fb),
148 vma->obj, &mode_cmd)) {
149 drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
150 goto err_vma;
151 }
152
153 plane_config->vma = vma;
154 return true;
155
156 err_vma:
157 i915_vma_put(vma);
158 return false;
159 }
160
161 static void
intel_find_initial_plane_obj(struct intel_crtc * crtc,struct intel_initial_plane_config * plane_config)162 intel_find_initial_plane_obj(struct intel_crtc *crtc,
163 struct intel_initial_plane_config *plane_config)
164 {
165 struct drm_device *dev = crtc->base.dev;
166 struct drm_i915_private *dev_priv = to_i915(dev);
167 struct intel_crtc_state *crtc_state =
168 to_intel_crtc_state(crtc->base.state);
169 struct intel_plane *plane =
170 to_intel_plane(crtc->base.primary);
171 struct intel_plane_state *plane_state =
172 to_intel_plane_state(plane->base.state);
173 struct drm_framebuffer *fb;
174 struct i915_vma *vma;
175
176 /*
177 * TODO:
178 * Disable planes if get_initial_plane_config() failed.
179 * Make sure things work if the surface base is not page aligned.
180 */
181 if (!plane_config->fb)
182 return;
183
184 if (intel_alloc_initial_plane_obj(crtc, plane_config)) {
185 fb = &plane_config->fb->base;
186 vma = plane_config->vma;
187 goto valid_fb;
188 }
189
190 /*
191 * Failed to alloc the obj, check to see if we should share
192 * an fb with another CRTC instead
193 */
194 if (intel_reuse_initial_plane_obj(dev_priv, plane_config, &fb, &vma))
195 goto valid_fb;
196
197 /*
198 * We've failed to reconstruct the BIOS FB. Current display state
199 * indicates that the primary plane is visible, but has a NULL FB,
200 * which will lead to problems later if we don't fix it up. The
201 * simplest solution is to just disable the primary plane now and
202 * pretend the BIOS never had it enabled.
203 */
204 intel_plane_disable_noatomic(crtc, plane);
205 if (crtc_state->bigjoiner) {
206 struct intel_crtc *slave =
207 crtc_state->bigjoiner_linked_crtc;
208 intel_plane_disable_noatomic(slave, to_intel_plane(slave->base.primary));
209 }
210
211 return;
212
213 valid_fb:
214 plane_state->uapi.rotation = plane_config->rotation;
215 intel_fb_fill_view(to_intel_framebuffer(fb),
216 plane_state->uapi.rotation, &plane_state->view);
217
218 __i915_vma_pin(vma);
219 plane_state->ggtt_vma = i915_vma_get(vma);
220 if (intel_plane_uses_fence(plane_state) &&
221 i915_vma_pin_fence(vma) == 0 && vma->fence)
222 plane_state->flags |= PLANE_HAS_FENCE;
223
224 plane_state->uapi.src_x = 0;
225 plane_state->uapi.src_y = 0;
226 plane_state->uapi.src_w = fb->width << 16;
227 plane_state->uapi.src_h = fb->height << 16;
228
229 plane_state->uapi.crtc_x = 0;
230 plane_state->uapi.crtc_y = 0;
231 plane_state->uapi.crtc_w = fb->width;
232 plane_state->uapi.crtc_h = fb->height;
233
234 if (plane_config->tiling)
235 dev_priv->preserve_bios_swizzle = true;
236
237 plane_state->uapi.fb = fb;
238 drm_framebuffer_get(fb);
239
240 plane_state->uapi.crtc = &crtc->base;
241 intel_plane_copy_uapi_to_hw_state(plane_state, plane_state, crtc);
242
243 atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)->bits);
244 }
245
plane_config_fini(struct intel_initial_plane_config * plane_config)246 static void plane_config_fini(struct intel_initial_plane_config *plane_config)
247 {
248 if (plane_config->fb) {
249 struct drm_framebuffer *fb = &plane_config->fb->base;
250
251 /* We may only have the stub and not a full framebuffer */
252 if (drm_framebuffer_read_refcount(fb))
253 drm_framebuffer_put(fb);
254 else
255 kfree(fb);
256 }
257
258 if (plane_config->vma)
259 i915_vma_put(plane_config->vma);
260 }
261
intel_crtc_initial_plane_config(struct intel_crtc * crtc)262 void intel_crtc_initial_plane_config(struct intel_crtc *crtc)
263 {
264 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
265 struct intel_initial_plane_config plane_config = {};
266
267 /*
268 * Note that reserving the BIOS fb up front prevents us
269 * from stuffing other stolen allocations like the ring
270 * on top. This prevents some ugliness at boot time, and
271 * can even allow for smooth boot transitions if the BIOS
272 * fb is large enough for the active pipe configuration.
273 */
274 dev_priv->display->get_initial_plane_config(crtc, &plane_config);
275
276 /*
277 * If the fb is shared between multiple heads, we'll
278 * just get the first one.
279 */
280 intel_find_initial_plane_obj(crtc, &plane_config);
281
282 plane_config_fini(&plane_config);
283 }
284