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