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 drm_calc_timestamping_constants(crtc, &crtc->mode); 68 69 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 70 out->vblank_hrtimer.function = &vkms_vblank_simulate; 71 out->period_ns = ktime_set(0, vblank->framedur_ns); 72 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); 73 74 return 0; 75 } 76 77 static void vkms_disable_vblank(struct drm_crtc *crtc) 78 { 79 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 80 81 hrtimer_cancel(&out->vblank_hrtimer); 82 } 83 84 static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc, 85 int *max_error, ktime_t *vblank_time, 86 bool in_vblank_irq) 87 { 88 struct drm_device *dev = crtc->dev; 89 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); 90 struct vkms_output *output = &vkmsdev->output; 91 struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc); 92 93 if (!READ_ONCE(vblank->enabled)) { 94 *vblank_time = ktime_get(); 95 return true; 96 } 97 98 *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires); 99 100 if (WARN_ON(*vblank_time == vblank->time)) 101 return true; 102 103 /* 104 * To prevent races we roll the hrtimer forward before we do any 105 * interrupt processing - this is how real hw works (the interrupt is 106 * only generated after all the vblank registers are updated) and what 107 * the vblank core expects. Therefore we need to always correct the 108 * timestampe by one frame. 109 */ 110 *vblank_time -= output->period_ns; 111 112 return true; 113 } 114 115 static struct drm_crtc_state * 116 vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc) 117 { 118 struct vkms_crtc_state *vkms_state; 119 120 if (WARN_ON(!crtc->state)) 121 return NULL; 122 123 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 124 if (!vkms_state) 125 return NULL; 126 127 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base); 128 129 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 130 131 return &vkms_state->base; 132 } 133 134 static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc, 135 struct drm_crtc_state *state) 136 { 137 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state); 138 139 __drm_atomic_helper_crtc_destroy_state(state); 140 141 WARN_ON(work_pending(&vkms_state->composer_work)); 142 kfree(vkms_state->active_planes); 143 kfree(vkms_state); 144 } 145 146 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc) 147 { 148 struct vkms_crtc_state *vkms_state = 149 kzalloc(sizeof(*vkms_state), GFP_KERNEL); 150 151 if (crtc->state) 152 vkms_atomic_crtc_destroy_state(crtc, crtc->state); 153 154 __drm_atomic_helper_crtc_reset(crtc, &vkms_state->base); 155 if (vkms_state) 156 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 157 } 158 159 static const struct drm_crtc_funcs vkms_crtc_funcs = { 160 .set_config = drm_atomic_helper_set_config, 161 .page_flip = drm_atomic_helper_page_flip, 162 .reset = vkms_atomic_crtc_reset, 163 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state, 164 .atomic_destroy_state = vkms_atomic_crtc_destroy_state, 165 .enable_vblank = vkms_enable_vblank, 166 .disable_vblank = vkms_disable_vblank, 167 .get_vblank_timestamp = vkms_get_vblank_timestamp, 168 .get_crc_sources = vkms_get_crc_sources, 169 .set_crc_source = vkms_set_crc_source, 170 .verify_crc_source = vkms_verify_crc_source, 171 }; 172 173 static int vkms_crtc_atomic_check(struct drm_crtc *crtc, 174 struct drm_atomic_state *state) 175 { 176 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, 177 crtc); 178 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc_state); 179 struct drm_plane *plane; 180 struct drm_plane_state *plane_state; 181 int i = 0, ret; 182 183 if (vkms_state->active_planes) 184 return 0; 185 186 ret = drm_atomic_add_affected_planes(crtc_state->state, crtc); 187 if (ret < 0) 188 return ret; 189 190 drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) { 191 plane_state = drm_atomic_get_existing_plane_state(crtc_state->state, 192 plane); 193 WARN_ON(!plane_state); 194 195 if (!plane_state->visible) 196 continue; 197 198 i++; 199 } 200 201 vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL); 202 if (!vkms_state->active_planes) 203 return -ENOMEM; 204 vkms_state->num_active_planes = i; 205 206 i = 0; 207 drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) { 208 plane_state = drm_atomic_get_existing_plane_state(crtc_state->state, 209 plane); 210 211 if (!plane_state->visible) 212 continue; 213 214 vkms_state->active_planes[i++] = 215 to_vkms_plane_state(plane_state); 216 } 217 218 return 0; 219 } 220 221 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 222 struct drm_atomic_state *state) 223 { 224 drm_crtc_vblank_on(crtc); 225 } 226 227 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 228 struct drm_atomic_state *state) 229 { 230 drm_crtc_vblank_off(crtc); 231 } 232 233 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 234 struct drm_atomic_state *state) 235 { 236 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 237 238 /* This lock is held across the atomic commit to block vblank timer 239 * from scheduling vkms_composer_worker until the composer is updated 240 */ 241 spin_lock_irq(&vkms_output->lock); 242 } 243 244 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 245 struct drm_atomic_state *state) 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 drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE); 291 drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE); 292 293 spin_lock_init(&vkms_out->lock); 294 spin_lock_init(&vkms_out->composer_lock); 295 296 vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0); 297 if (!vkms_out->composer_workq) 298 return -ENOMEM; 299 300 return ret; 301 } 302