1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <linux/dma-fence.h> 4 5 #include <drm/drm_atomic.h> 6 #include <drm/drm_atomic_helper.h> 7 #include <drm/drm_probe_helper.h> 8 #include <drm/drm_vblank.h> 9 10 #include "vkms_drv.h" 11 12 static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) 13 { 14 struct vkms_output *output = container_of(timer, struct vkms_output, 15 vblank_hrtimer); 16 struct drm_crtc *crtc = &output->crtc; 17 struct vkms_crtc_state *state; 18 u64 ret_overrun; 19 bool ret, fence_cookie; 20 21 fence_cookie = dma_fence_begin_signalling(); 22 23 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, 24 output->period_ns); 25 if (ret_overrun != 1) 26 pr_warn("%s: vblank timer overrun\n", __func__); 27 28 spin_lock(&output->lock); 29 ret = drm_crtc_handle_vblank(crtc); 30 if (!ret) 31 DRM_ERROR("vkms failure on handling vblank"); 32 33 state = output->composer_state; 34 spin_unlock(&output->lock); 35 36 if (state && output->composer_enabled) { 37 u64 frame = drm_crtc_accurate_vblank_count(crtc); 38 39 /* update frame_start only if a queued vkms_composer_worker() 40 * has read the data 41 */ 42 spin_lock(&output->composer_lock); 43 if (!state->crc_pending) 44 state->frame_start = frame; 45 else 46 DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n", 47 state->frame_start, frame); 48 state->frame_end = frame; 49 state->crc_pending = true; 50 spin_unlock(&output->composer_lock); 51 52 ret = queue_work(output->composer_workq, &state->composer_work); 53 if (!ret) 54 DRM_DEBUG_DRIVER("Composer worker already queued\n"); 55 } 56 57 dma_fence_end_signalling(fence_cookie); 58 59 return HRTIMER_RESTART; 60 } 61 62 static int vkms_enable_vblank(struct drm_crtc *crtc) 63 { 64 struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc); 65 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 66 67 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 68 out->vblank_hrtimer.function = &vkms_vblank_simulate; 69 out->period_ns = ktime_set(0, vblank->framedur_ns); 70 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); 71 72 return 0; 73 } 74 75 static void vkms_disable_vblank(struct drm_crtc *crtc) 76 { 77 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 78 79 hrtimer_cancel(&out->vblank_hrtimer); 80 } 81 82 static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc, 83 int *max_error, ktime_t *vblank_time, 84 bool in_vblank_irq) 85 { 86 struct drm_device *dev = crtc->dev; 87 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); 88 struct vkms_output *output = &vkmsdev->output; 89 struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc); 90 91 if (!READ_ONCE(vblank->enabled)) { 92 *vblank_time = ktime_get(); 93 return true; 94 } 95 96 *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires); 97 98 if (WARN_ON(*vblank_time == vblank->time)) 99 return true; 100 101 /* 102 * To prevent races we roll the hrtimer forward before we do any 103 * interrupt processing - this is how real hw works (the interrupt is 104 * only generated after all the vblank registers are updated) and what 105 * the vblank core expects. Therefore we need to always correct the 106 * timestampe by one frame. 107 */ 108 *vblank_time -= output->period_ns; 109 110 return true; 111 } 112 113 static struct drm_crtc_state * 114 vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc) 115 { 116 struct vkms_crtc_state *vkms_state; 117 118 if (WARN_ON(!crtc->state)) 119 return NULL; 120 121 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 122 if (!vkms_state) 123 return NULL; 124 125 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base); 126 127 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 128 129 return &vkms_state->base; 130 } 131 132 static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc, 133 struct drm_crtc_state *state) 134 { 135 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state); 136 137 __drm_atomic_helper_crtc_destroy_state(state); 138 139 WARN_ON(work_pending(&vkms_state->composer_work)); 140 kfree(vkms_state->active_planes); 141 kfree(vkms_state); 142 } 143 144 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc) 145 { 146 struct vkms_crtc_state *vkms_state = 147 kzalloc(sizeof(*vkms_state), GFP_KERNEL); 148 149 if (crtc->state) 150 vkms_atomic_crtc_destroy_state(crtc, crtc->state); 151 152 __drm_atomic_helper_crtc_reset(crtc, &vkms_state->base); 153 if (vkms_state) 154 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 155 } 156 157 static const struct drm_crtc_funcs vkms_crtc_funcs = { 158 .set_config = drm_atomic_helper_set_config, 159 .page_flip = drm_atomic_helper_page_flip, 160 .reset = vkms_atomic_crtc_reset, 161 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state, 162 .atomic_destroy_state = vkms_atomic_crtc_destroy_state, 163 .enable_vblank = vkms_enable_vblank, 164 .disable_vblank = vkms_disable_vblank, 165 .get_vblank_timestamp = vkms_get_vblank_timestamp, 166 .get_crc_sources = vkms_get_crc_sources, 167 .set_crc_source = vkms_set_crc_source, 168 .verify_crc_source = vkms_verify_crc_source, 169 }; 170 171 static int vkms_crtc_atomic_check(struct drm_crtc *crtc, 172 struct drm_atomic_state *state) 173 { 174 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, 175 crtc); 176 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc_state); 177 struct drm_plane *plane; 178 struct drm_plane_state *plane_state; 179 int i = 0, ret; 180 181 if (vkms_state->active_planes) 182 return 0; 183 184 ret = drm_atomic_add_affected_planes(crtc_state->state, crtc); 185 if (ret < 0) 186 return ret; 187 188 drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) { 189 plane_state = drm_atomic_get_existing_plane_state(crtc_state->state, 190 plane); 191 WARN_ON(!plane_state); 192 193 if (!plane_state->visible) 194 continue; 195 196 i++; 197 } 198 199 vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL); 200 if (!vkms_state->active_planes) 201 return -ENOMEM; 202 vkms_state->num_active_planes = i; 203 204 i = 0; 205 drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) { 206 plane_state = drm_atomic_get_existing_plane_state(crtc_state->state, 207 plane); 208 209 if (!plane_state->visible) 210 continue; 211 212 vkms_state->active_planes[i++] = 213 to_vkms_plane_state(plane_state); 214 } 215 216 return 0; 217 } 218 219 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 220 struct drm_atomic_state *state) 221 { 222 drm_crtc_vblank_on(crtc); 223 } 224 225 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 226 struct drm_atomic_state *state) 227 { 228 drm_crtc_vblank_off(crtc); 229 } 230 231 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 232 struct drm_atomic_state *state) 233 __acquires(&vkms_output->lock) 234 { 235 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 236 237 /* This lock is held across the atomic commit to block vblank timer 238 * from scheduling vkms_composer_worker until the composer is updated 239 */ 240 spin_lock_irq(&vkms_output->lock); 241 } 242 243 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 244 struct drm_atomic_state *state) 245 __releases(&vkms_output->lock) 246 { 247 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 248 249 if (crtc->state->event) { 250 spin_lock(&crtc->dev->event_lock); 251 252 if (drm_crtc_vblank_get(crtc) != 0) 253 drm_crtc_send_vblank_event(crtc, crtc->state->event); 254 else 255 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 256 257 spin_unlock(&crtc->dev->event_lock); 258 259 crtc->state->event = NULL; 260 } 261 262 vkms_output->composer_state = to_vkms_crtc_state(crtc->state); 263 264 spin_unlock_irq(&vkms_output->lock); 265 } 266 267 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { 268 .atomic_check = vkms_crtc_atomic_check, 269 .atomic_begin = vkms_crtc_atomic_begin, 270 .atomic_flush = vkms_crtc_atomic_flush, 271 .atomic_enable = vkms_crtc_atomic_enable, 272 .atomic_disable = vkms_crtc_atomic_disable, 273 }; 274 275 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 276 struct drm_plane *primary, struct drm_plane *cursor) 277 { 278 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc); 279 int ret; 280 281 ret = drmm_crtc_init_with_planes(dev, crtc, primary, cursor, 282 &vkms_crtc_funcs, NULL); 283 if (ret) { 284 DRM_ERROR("Failed to init CRTC\n"); 285 return ret; 286 } 287 288 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); 289 290 ret = drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE); 291 if (ret) { 292 DRM_ERROR("Failed to set gamma size\n"); 293 return ret; 294 } 295 296 drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE); 297 298 spin_lock_init(&vkms_out->lock); 299 spin_lock_init(&vkms_out->composer_lock); 300 301 vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0); 302 if (!vkms_out->composer_workq) 303 return -ENOMEM; 304 305 return ret; 306 } 307