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1// SPDX-License-Identifier: GPL-2.0+
2
3#include <drm/drm_atomic.h>
4#include <drm/drm_atomic_helper.h>
5#include <drm/drm_probe_helper.h>
6#include <drm/drm_vblank.h>
7
8#include "vkms_drv.h"
9
10static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
11{
12 struct vkms_output *output = container_of(timer, struct vkms_output,
13 vblank_hrtimer);
14 struct drm_crtc *crtc = &output->crtc;
15 struct vkms_crtc_state *state;
16 u64 ret_overrun;
17 bool ret;
18
19 spin_lock(&output->lock);
20
21 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
22 output->period_ns);
23 WARN_ON(ret_overrun != 1);
24
25 ret = drm_crtc_handle_vblank(crtc);
26 if (!ret)
27 DRM_ERROR("vkms failure on handling vblank");
28
29 state = output->composer_state;
30 if (state && output->composer_enabled) {
31 u64 frame = drm_crtc_accurate_vblank_count(crtc);
32
33 /* update frame_start only if a queued vkms_composer_worker()
34 * has read the data
35 */
36 spin_lock(&output->composer_lock);
37 if (!state->crc_pending)
38 state->frame_start = frame;
39 else
40 DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n",
41 state->frame_start, frame);
42 state->frame_end = frame;
43 state->crc_pending = true;
44 spin_unlock(&output->composer_lock);
45
46 ret = queue_work(output->composer_workq, &state->composer_work);
47 if (!ret)
48 DRM_DEBUG_DRIVER("Composer worker already queued\n");
49 }
50
51 spin_unlock(&output->lock);
52
53 return HRTIMER_RESTART;
54}
55
56static int vkms_enable_vblank(struct drm_crtc *crtc)
57{
58 struct drm_device *dev = crtc->dev;
59 unsigned int pipe = drm_crtc_index(crtc);
60 struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
61 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
62
63 drm_calc_timestamping_constants(crtc, &crtc->mode);
64
65 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
66 out->vblank_hrtimer.function = &vkms_vblank_simulate;
67 out->period_ns = ktime_set(0, vblank->framedur_ns);
68 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL);
69
70 return 0;
71}
72
73static void vkms_disable_vblank(struct drm_crtc *crtc)
74{
75 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
76
77 hrtimer_cancel(&out->vblank_hrtimer);
78}
79
80bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
81 int *max_error, ktime_t *vblank_time,
82 bool in_vblank_irq)
83{
84 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
85 struct vkms_output *output = &vkmsdev->output;
86 struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
87
88 *vblank_time = output->vblank_hrtimer.node.expires;
89
90 if (WARN_ON(*vblank_time == vblank->time))
91 return true;
92
93 /*
94 * To prevent races we roll the hrtimer forward before we do any
95 * interrupt processing - this is how real hw works (the interrupt is
96 * only generated after all the vblank registers are updated) and what
97 * the vblank core expects. Therefore we need to always correct the
98 * timestampe by one frame.
99 */
100 *vblank_time -= output->period_ns;
101
102 return true;
103}
104
105static struct drm_crtc_state *
106vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
107{
108 struct vkms_crtc_state *vkms_state;
109
110 if (WARN_ON(!crtc->state))
111 return NULL;
112
113 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
114 if (!vkms_state)
115 return NULL;
116
117 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
118
119 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
120
121 return &vkms_state->base;
122}
123
124static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
125 struct drm_crtc_state *state)
126{
127 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
128
129 __drm_atomic_helper_crtc_destroy_state(state);
130
131 WARN_ON(work_pending(&vkms_state->composer_work));
132 kfree(vkms_state->active_planes);
133 kfree(vkms_state);
134}
135
136static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
137{
138 struct vkms_crtc_state *vkms_state =
139 kzalloc(sizeof(*vkms_state), GFP_KERNEL);
140
141 if (crtc->state)
142 vkms_atomic_crtc_destroy_state(crtc, crtc->state);
143
144 __drm_atomic_helper_crtc_reset(crtc, &vkms_state->base);
145 if (vkms_state)
146 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
147}
148
149static const struct drm_crtc_funcs vkms_crtc_funcs = {
150 .set_config = drm_atomic_helper_set_config,
151 .destroy = drm_crtc_cleanup,
152 .page_flip = drm_atomic_helper_page_flip,
153 .reset = vkms_atomic_crtc_reset,
154 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state,
155 .atomic_destroy_state = vkms_atomic_crtc_destroy_state,
156 .enable_vblank = vkms_enable_vblank,
157 .disable_vblank = vkms_disable_vblank,
158 .get_crc_sources = vkms_get_crc_sources,
159 .set_crc_source = vkms_set_crc_source,
160 .verify_crc_source = vkms_verify_crc_source,
161};
162
163static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
164 struct drm_crtc_state *state)
165{
166 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
167 struct drm_plane *plane;
168 struct drm_plane_state *plane_state;
169 int i = 0, ret;
170
171 if (vkms_state->active_planes)
172 return 0;
173
174 ret = drm_atomic_add_affected_planes(state->state, crtc);
175 if (ret < 0)
176 return ret;
177
178 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
179 plane_state = drm_atomic_get_existing_plane_state(state->state,
180 plane);
181 WARN_ON(!plane_state);
182
183 if (!plane_state->visible)
184 continue;
185
186 i++;
187 }
188
189 vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL);
190 if (!vkms_state->active_planes)
191 return -ENOMEM;
192 vkms_state->num_active_planes = i;
193
194 i = 0;
195 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
196 plane_state = drm_atomic_get_existing_plane_state(state->state,
197 plane);
198
199 if (!plane_state->visible)
200 continue;
201
202 vkms_state->active_planes[i++] =
203 to_vkms_plane_state(plane_state);
204 }
205
206 return 0;
207}
208
209static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
210 struct drm_crtc_state *old_state)
211{
212 drm_crtc_vblank_on(crtc);
213}
214
215static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
216 struct drm_crtc_state *old_state)
217{
218 drm_crtc_vblank_off(crtc);
219}
220
221static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
222 struct drm_crtc_state *old_crtc_state)
223{
224 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
225
226 /* This lock is held across the atomic commit to block vblank timer
227 * from scheduling vkms_composer_worker until the composer is updated
228 */
229 spin_lock_irq(&vkms_output->lock);
230}
231
232static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
233 struct drm_crtc_state *old_crtc_state)
234{
235 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
236
237 if (crtc->state->event) {
238 spin_lock(&crtc->dev->event_lock);
239
240 if (drm_crtc_vblank_get(crtc) != 0)
241 drm_crtc_send_vblank_event(crtc, crtc->state->event);
242 else
243 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
244
245 spin_unlock(&crtc->dev->event_lock);
246
247 crtc->state->event = NULL;
248 }
249
250 vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
251
252 spin_unlock_irq(&vkms_output->lock);
253}
254
255static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
256 .atomic_check = vkms_crtc_atomic_check,
257 .atomic_begin = vkms_crtc_atomic_begin,
258 .atomic_flush = vkms_crtc_atomic_flush,
259 .atomic_enable = vkms_crtc_atomic_enable,
260 .atomic_disable = vkms_crtc_atomic_disable,
261};
262
263int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
264 struct drm_plane *primary, struct drm_plane *cursor)
265{
266 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc);
267 int ret;
268
269 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
270 &vkms_crtc_funcs, NULL);
271 if (ret) {
272 DRM_ERROR("Failed to init CRTC\n");
273 return ret;
274 }
275
276 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
277
278 spin_lock_init(&vkms_out->lock);
279 spin_lock_init(&vkms_out->composer_lock);
280
281 vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
282 if (!vkms_out->composer_workq)
283 return -ENOMEM;
284
285 return ret;
286}