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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2
3/*
4 * Xen para-virtual DRM device
5 *
6 * Copyright (C) 2016-2018 EPAM Systems Inc.
7 *
8 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
9 */
10
11#include <drm/drm_atomic.h>
12#include <drm/drm_atomic_helper.h>
13#include <drm/drm_drv.h>
14#include <drm/drm_fourcc.h>
15#include <drm/drm_gem.h>
16#include <drm/drm_gem_atomic_helper.h>
17#include <drm/drm_gem_framebuffer_helper.h>
18#include <drm/drm_probe_helper.h>
19#include <drm/drm_vblank.h>
20
21#include "xen_drm_front.h"
22#include "xen_drm_front_conn.h"
23#include "xen_drm_front_kms.h"
24
25/*
26 * Timeout in ms to wait for frame done event from the backend:
27 * must be a bit more than IO time-out
28 */
29#define FRAME_DONE_TO_MS (XEN_DRM_FRONT_WAIT_BACK_MS + 100)
30
31static struct xen_drm_front_drm_pipeline *
32to_xen_drm_pipeline(struct drm_simple_display_pipe *pipe)
33{
34 return container_of(pipe, struct xen_drm_front_drm_pipeline, pipe);
35}
36
37static void fb_destroy(struct drm_framebuffer *fb)
38{
39 struct xen_drm_front_drm_info *drm_info = fb->dev->dev_private;
40 int idx;
41
42 if (drm_dev_enter(fb->dev, &idx)) {
43 xen_drm_front_fb_detach(drm_info->front_info,
44 xen_drm_front_fb_to_cookie(fb));
45 drm_dev_exit(idx);
46 }
47 drm_gem_fb_destroy(fb);
48}
49
50static const struct drm_framebuffer_funcs fb_funcs = {
51 .destroy = fb_destroy,
52};
53
54static struct drm_framebuffer *
55fb_create(struct drm_device *dev, struct drm_file *filp,
56 const struct drm_mode_fb_cmd2 *mode_cmd)
57{
58 struct xen_drm_front_drm_info *drm_info = dev->dev_private;
59 struct drm_framebuffer *fb;
60 struct drm_gem_object *gem_obj;
61 int ret;
62
63 fb = drm_gem_fb_create_with_funcs(dev, filp, mode_cmd, &fb_funcs);
64 if (IS_ERR(fb))
65 return fb;
66
67 gem_obj = fb->obj[0];
68
69 ret = xen_drm_front_fb_attach(drm_info->front_info,
70 xen_drm_front_dbuf_to_cookie(gem_obj),
71 xen_drm_front_fb_to_cookie(fb),
72 fb->width, fb->height,
73 fb->format->format);
74 if (ret < 0) {
75 DRM_ERROR("Back failed to attach FB %p: %d\n", fb, ret);
76 goto fail;
77 }
78
79 return fb;
80
81fail:
82 drm_gem_fb_destroy(fb);
83 return ERR_PTR(ret);
84}
85
86static const struct drm_mode_config_funcs mode_config_funcs = {
87 .fb_create = fb_create,
88 .atomic_check = drm_atomic_helper_check,
89 .atomic_commit = drm_atomic_helper_commit,
90};
91
92static void send_pending_event(struct xen_drm_front_drm_pipeline *pipeline)
93{
94 struct drm_crtc *crtc = &pipeline->pipe.crtc;
95 struct drm_device *dev = crtc->dev;
96 unsigned long flags;
97
98 spin_lock_irqsave(&dev->event_lock, flags);
99 if (pipeline->pending_event)
100 drm_crtc_send_vblank_event(crtc, pipeline->pending_event);
101 pipeline->pending_event = NULL;
102 spin_unlock_irqrestore(&dev->event_lock, flags);
103}
104
105static void display_enable(struct drm_simple_display_pipe *pipe,
106 struct drm_crtc_state *crtc_state,
107 struct drm_plane_state *plane_state)
108{
109 struct xen_drm_front_drm_pipeline *pipeline =
110 to_xen_drm_pipeline(pipe);
111 struct drm_crtc *crtc = &pipe->crtc;
112 struct drm_framebuffer *fb = plane_state->fb;
113 int ret, idx;
114
115 if (!drm_dev_enter(pipe->crtc.dev, &idx))
116 return;
117
118 ret = xen_drm_front_mode_set(pipeline, crtc->x, crtc->y,
119 fb->width, fb->height,
120 fb->format->cpp[0] * 8,
121 xen_drm_front_fb_to_cookie(fb));
122
123 if (ret) {
124 DRM_ERROR("Failed to enable display: %d\n", ret);
125 pipeline->conn_connected = false;
126 }
127
128 drm_dev_exit(idx);
129}
130
131static void display_disable(struct drm_simple_display_pipe *pipe)
132{
133 struct xen_drm_front_drm_pipeline *pipeline =
134 to_xen_drm_pipeline(pipe);
135 int ret = 0, idx;
136
137 if (drm_dev_enter(pipe->crtc.dev, &idx)) {
138 ret = xen_drm_front_mode_set(pipeline, 0, 0, 0, 0, 0,
139 xen_drm_front_fb_to_cookie(NULL));
140 drm_dev_exit(idx);
141 }
142 if (ret)
143 DRM_ERROR("Failed to disable display: %d\n", ret);
144
145 /* Make sure we can restart with enabled connector next time */
146 pipeline->conn_connected = true;
147
148 /* release stalled event if any */
149 send_pending_event(pipeline);
150}
151
152void xen_drm_front_kms_on_frame_done(struct xen_drm_front_drm_pipeline *pipeline,
153 u64 fb_cookie)
154{
155 /*
156 * This runs in interrupt context, e.g. under
157 * drm_info->front_info->io_lock, so we cannot call _sync version
158 * to cancel the work
159 */
160 cancel_delayed_work(&pipeline->pflip_to_worker);
161
162 send_pending_event(pipeline);
163}
164
165static void pflip_to_worker(struct work_struct *work)
166{
167 struct delayed_work *delayed_work = to_delayed_work(work);
168 struct xen_drm_front_drm_pipeline *pipeline =
169 container_of(delayed_work,
170 struct xen_drm_front_drm_pipeline,
171 pflip_to_worker);
172
173 DRM_ERROR("Frame done timed-out, releasing");
174 send_pending_event(pipeline);
175}
176
177static bool display_send_page_flip(struct drm_simple_display_pipe *pipe,
178 struct drm_plane_state *old_plane_state)
179{
180 struct drm_plane_state *plane_state =
181 drm_atomic_get_new_plane_state(old_plane_state->state,
182 &pipe->plane);
183
184 /*
185 * If old_plane_state->fb is NULL and plane_state->fb is not,
186 * then this is an atomic commit which will enable display.
187 * If old_plane_state->fb is not NULL and plane_state->fb is,
188 * then this is an atomic commit which will disable display.
189 * Ignore these and do not send page flip as this framebuffer will be
190 * sent to the backend as a part of display_set_config call.
191 */
192 if (old_plane_state->fb && plane_state->fb) {
193 struct xen_drm_front_drm_pipeline *pipeline =
194 to_xen_drm_pipeline(pipe);
195 struct xen_drm_front_drm_info *drm_info = pipeline->drm_info;
196 int ret;
197
198 schedule_delayed_work(&pipeline->pflip_to_worker,
199 msecs_to_jiffies(FRAME_DONE_TO_MS));
200
201 ret = xen_drm_front_page_flip(drm_info->front_info,
202 pipeline->index,
203 xen_drm_front_fb_to_cookie(plane_state->fb));
204 if (ret) {
205 DRM_ERROR("Failed to send page flip request to backend: %d\n", ret);
206
207 pipeline->conn_connected = false;
208 /*
209 * Report the flip not handled, so pending event is
210 * sent, unblocking user-space.
211 */
212 return false;
213 }
214 /*
215 * Signal that page flip was handled, pending event will be sent
216 * on frame done event from the backend.
217 */
218 return true;
219 }
220
221 return false;
222}
223
224static int display_check(struct drm_simple_display_pipe *pipe,
225 struct drm_plane_state *plane_state,
226 struct drm_crtc_state *crtc_state)
227{
228 /*
229 * Xen doesn't initialize vblanking via drm_vblank_init(), so
230 * DRM helpers assume that it doesn't handle vblanking and start
231 * sending out fake VBLANK events automatically.
232 *
233 * As xen contains it's own logic for sending out VBLANK events
234 * in send_pending_event(), disable no_vblank (i.e., the xen
235 * driver has vblanking support).
236 */
237 crtc_state->no_vblank = false;
238
239 return 0;
240}
241
242static void display_update(struct drm_simple_display_pipe *pipe,
243 struct drm_plane_state *old_plane_state)
244{
245 struct xen_drm_front_drm_pipeline *pipeline =
246 to_xen_drm_pipeline(pipe);
247 struct drm_crtc *crtc = &pipe->crtc;
248 struct drm_pending_vblank_event *event;
249 int idx;
250
251 event = crtc->state->event;
252 if (event) {
253 struct drm_device *dev = crtc->dev;
254 unsigned long flags;
255
256 WARN_ON(pipeline->pending_event);
257
258 spin_lock_irqsave(&dev->event_lock, flags);
259 crtc->state->event = NULL;
260
261 pipeline->pending_event = event;
262 spin_unlock_irqrestore(&dev->event_lock, flags);
263 }
264
265 if (!drm_dev_enter(pipe->crtc.dev, &idx)) {
266 send_pending_event(pipeline);
267 return;
268 }
269
270 /*
271 * Send page flip request to the backend *after* we have event cached
272 * above, so on page flip done event from the backend we can
273 * deliver it and there is no race condition between this code and
274 * event from the backend.
275 * If this is not a page flip, e.g. no flip done event from the backend
276 * is expected, then send now.
277 */
278 if (!display_send_page_flip(pipe, old_plane_state))
279 send_pending_event(pipeline);
280
281 drm_dev_exit(idx);
282}
283
284static enum drm_mode_status
285display_mode_valid(struct drm_simple_display_pipe *pipe,
286 const struct drm_display_mode *mode)
287{
288 struct xen_drm_front_drm_pipeline *pipeline =
289 container_of(pipe, struct xen_drm_front_drm_pipeline,
290 pipe);
291
292 if (mode->hdisplay != pipeline->width)
293 return MODE_ERROR;
294
295 if (mode->vdisplay != pipeline->height)
296 return MODE_ERROR;
297
298 return MODE_OK;
299}
300
301static const struct drm_simple_display_pipe_funcs display_funcs = {
302 .mode_valid = display_mode_valid,
303 .enable = display_enable,
304 .disable = display_disable,
305 .prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
306 .check = display_check,
307 .update = display_update,
308};
309
310static int display_pipe_init(struct xen_drm_front_drm_info *drm_info,
311 int index, struct xen_drm_front_cfg_connector *cfg,
312 struct xen_drm_front_drm_pipeline *pipeline)
313{
314 struct drm_device *dev = drm_info->drm_dev;
315 const u32 *formats;
316 int format_count;
317 int ret;
318
319 pipeline->drm_info = drm_info;
320 pipeline->index = index;
321 pipeline->height = cfg->height;
322 pipeline->width = cfg->width;
323
324 INIT_DELAYED_WORK(&pipeline->pflip_to_worker, pflip_to_worker);
325
326 ret = xen_drm_front_conn_init(drm_info, &pipeline->conn);
327 if (ret)
328 return ret;
329
330 formats = xen_drm_front_conn_get_formats(&format_count);
331
332 return drm_simple_display_pipe_init(dev, &pipeline->pipe,
333 &display_funcs, formats,
334 format_count, NULL,
335 &pipeline->conn);
336}
337
338int xen_drm_front_kms_init(struct xen_drm_front_drm_info *drm_info)
339{
340 struct drm_device *dev = drm_info->drm_dev;
341 int i, ret;
342
343 drm_mode_config_init(dev);
344
345 dev->mode_config.min_width = 0;
346 dev->mode_config.min_height = 0;
347 dev->mode_config.max_width = 4095;
348 dev->mode_config.max_height = 2047;
349 dev->mode_config.funcs = &mode_config_funcs;
350
351 for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) {
352 struct xen_drm_front_cfg_connector *cfg =
353 &drm_info->front_info->cfg.connectors[i];
354 struct xen_drm_front_drm_pipeline *pipeline =
355 &drm_info->pipeline[i];
356
357 ret = display_pipe_init(drm_info, i, cfg, pipeline);
358 if (ret) {
359 drm_mode_config_cleanup(dev);
360 return ret;
361 }
362 }
363
364 drm_mode_config_reset(dev);
365 drm_kms_helper_poll_init(dev);
366 return 0;
367}
368
369void xen_drm_front_kms_fini(struct xen_drm_front_drm_info *drm_info)
370{
371 int i;
372
373 for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) {
374 struct xen_drm_front_drm_pipeline *pipeline =
375 &drm_info->pipeline[i];
376
377 cancel_delayed_work_sync(&pipeline->pflip_to_worker);
378
379 send_pending_event(pipeline);
380 }
381}