1 // SPDX-License-Identifier: GPL-2.0+
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>
10 static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
12 struct vkms_output *output = container_of(timer, struct vkms_output,
14 struct drm_crtc *crtc = &output->crtc;
15 struct vkms_crtc_state *state;
19 spin_lock(&output->lock);
21 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
23 WARN_ON(ret_overrun != 1);
25 ret = drm_crtc_handle_vblank(crtc);
27 DRM_ERROR("vkms failure on handling vblank");
29 state = output->composer_state;
30 if (state && output->composer_enabled) {
31 u64 frame = drm_crtc_accurate_vblank_count(crtc);
33 /* update frame_start only if a queued vkms_composer_worker()
36 spin_lock(&output->composer_lock);
37 if (!state->crc_pending)
38 state->frame_start = frame;
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);
46 ret = queue_work(output->composer_workq, &state->composer_work);
48 DRM_DEBUG_DRIVER("Composer worker already queued\n");
51 spin_unlock(&output->lock);
53 return HRTIMER_RESTART;
56 static int vkms_enable_vblank(struct drm_crtc *crtc)
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);
63 drm_calc_timestamping_constants(crtc, &crtc->mode);
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);
73 static void vkms_disable_vblank(struct drm_crtc *crtc)
75 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
77 hrtimer_cancel(&out->vblank_hrtimer);
80 bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
81 int *max_error, ktime_t *vblank_time,
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];
88 *vblank_time = output->vblank_hrtimer.node.expires;
90 if (WARN_ON(*vblank_time == vblank->time))
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.
100 *vblank_time -= output->period_ns;
105 static struct drm_crtc_state *
106 vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
108 struct vkms_crtc_state *vkms_state;
110 if (WARN_ON(!crtc->state))
113 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
117 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
119 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
121 return &vkms_state->base;
124 static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
125 struct drm_crtc_state *state)
127 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
129 __drm_atomic_helper_crtc_destroy_state(state);
131 WARN_ON(work_pending(&vkms_state->composer_work));
132 kfree(vkms_state->active_planes);
136 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
138 struct vkms_crtc_state *vkms_state =
139 kzalloc(sizeof(*vkms_state), GFP_KERNEL);
142 vkms_atomic_crtc_destroy_state(crtc, crtc->state);
144 __drm_atomic_helper_crtc_reset(crtc, &vkms_state->base);
146 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
149 static 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,
163 static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
164 struct drm_crtc_state *state)
166 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
167 struct drm_plane *plane;
168 struct drm_plane_state *plane_state;
171 if (vkms_state->active_planes)
174 ret = drm_atomic_add_affected_planes(state->state, crtc);
178 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
179 plane_state = drm_atomic_get_existing_plane_state(state->state,
181 WARN_ON(!plane_state);
183 if (!plane_state->visible)
189 vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL);
190 if (!vkms_state->active_planes)
192 vkms_state->num_active_planes = i;
195 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
196 plane_state = drm_atomic_get_existing_plane_state(state->state,
199 if (!plane_state->visible)
202 vkms_state->active_planes[i++] =
203 to_vkms_plane_state(plane_state);
209 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
210 struct drm_crtc_state *old_state)
212 drm_crtc_vblank_on(crtc);
215 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
216 struct drm_crtc_state *old_state)
218 drm_crtc_vblank_off(crtc);
221 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
222 struct drm_crtc_state *old_crtc_state)
224 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
226 /* This lock is held across the atomic commit to block vblank timer
227 * from scheduling vkms_composer_worker until the composer is updated
229 spin_lock_irq(&vkms_output->lock);
232 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
233 struct drm_crtc_state *old_crtc_state)
235 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
237 if (crtc->state->event) {
238 spin_lock(&crtc->dev->event_lock);
240 if (drm_crtc_vblank_get(crtc) != 0)
241 drm_crtc_send_vblank_event(crtc, crtc->state->event);
243 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
245 spin_unlock(&crtc->dev->event_lock);
247 crtc->state->event = NULL;
250 vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
252 spin_unlock_irq(&vkms_output->lock);
255 static 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,
263 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
264 struct drm_plane *primary, struct drm_plane *cursor)
266 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc);
269 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
270 &vkms_crtc_funcs, NULL);
272 DRM_ERROR("Failed to init CRTC\n");
276 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
278 spin_lock_init(&vkms_out->lock);
279 spin_lock_init(&vkms_out->composer_lock);
281 vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
282 if (!vkms_out->composer_workq)