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 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, 20 output->period_ns); 21 if (ret_overrun != 1) 22 pr_warn("%s: vblank timer overrun\n", __func__); 23 24 spin_lock(&output->lock); 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 spin_unlock(&output->lock); 31 32 if (state && output->composer_enabled) { 33 u64 frame = drm_crtc_accurate_vblank_count(crtc); 34 35 /* update frame_start only if a queued vkms_composer_worker() 36 * has read the data 37 */ 38 spin_lock(&output->composer_lock); 39 if (!state->crc_pending) 40 state->frame_start = frame; 41 else 42 DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n", 43 state->frame_start, frame); 44 state->frame_end = frame; 45 state->crc_pending = true; 46 spin_unlock(&output->composer_lock); 47 48 ret = queue_work(output->composer_workq, &state->composer_work); 49 if (!ret) 50 DRM_DEBUG_DRIVER("Composer worker already queued\n"); 51 } 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 80static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc, 81 int *max_error, ktime_t *vblank_time, 82 bool in_vblank_irq) 83{ 84 struct drm_device *dev = crtc->dev; 85 unsigned int pipe = crtc->index; 86 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); 87 struct vkms_output *output = &vkmsdev->output; 88 struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; 89 90 if (!READ_ONCE(vblank->enabled)) { 91 *vblank_time = ktime_get(); 92 return true; 93 } 94 95 *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires); 96 97 if (WARN_ON(*vblank_time == vblank->time)) 98 return true; 99 100 /* 101 * To prevent races we roll the hrtimer forward before we do any 102 * interrupt processing - this is how real hw works (the interrupt is 103 * only generated after all the vblank registers are updated) and what 104 * the vblank core expects. Therefore we need to always correct the 105 * timestampe by one frame. 106 */ 107 *vblank_time -= output->period_ns; 108 109 return true; 110} 111 112static struct drm_crtc_state * 113vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc) 114{ 115 struct vkms_crtc_state *vkms_state; 116 117 if (WARN_ON(!crtc->state)) 118 return NULL; 119 120 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 121 if (!vkms_state) 122 return NULL; 123 124 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base); 125 126 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 127 128 return &vkms_state->base; 129} 130 131static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc, 132 struct drm_crtc_state *state) 133{ 134 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state); 135 136 __drm_atomic_helper_crtc_destroy_state(state); 137 138 WARN_ON(work_pending(&vkms_state->composer_work)); 139 kfree(vkms_state->active_planes); 140 kfree(vkms_state); 141} 142 143static void vkms_atomic_crtc_reset(struct drm_crtc *crtc) 144{ 145 struct vkms_crtc_state *vkms_state = 146 kzalloc(sizeof(*vkms_state), GFP_KERNEL); 147 148 if (crtc->state) 149 vkms_atomic_crtc_destroy_state(crtc, crtc->state); 150 151 __drm_atomic_helper_crtc_reset(crtc, &vkms_state->base); 152 if (vkms_state) 153 INIT_WORK(&vkms_state->composer_work, vkms_composer_worker); 154} 155 156static const struct drm_crtc_funcs vkms_crtc_funcs = { 157 .set_config = drm_atomic_helper_set_config, 158 .destroy = drm_crtc_cleanup, 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 171static int vkms_crtc_atomic_check(struct drm_crtc *crtc, 172 struct drm_crtc_state *state) 173{ 174 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state); 175 struct drm_plane *plane; 176 struct drm_plane_state *plane_state; 177 int i = 0, ret; 178 179 if (vkms_state->active_planes) 180 return 0; 181 182 ret = drm_atomic_add_affected_planes(state->state, crtc); 183 if (ret < 0) 184 return ret; 185 186 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) { 187 plane_state = drm_atomic_get_existing_plane_state(state->state, 188 plane); 189 WARN_ON(!plane_state); 190 191 if (!plane_state->visible) 192 continue; 193 194 i++; 195 } 196 197 vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL); 198 if (!vkms_state->active_planes) 199 return -ENOMEM; 200 vkms_state->num_active_planes = i; 201 202 i = 0; 203 drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) { 204 plane_state = drm_atomic_get_existing_plane_state(state->state, 205 plane); 206 207 if (!plane_state->visible) 208 continue; 209 210 vkms_state->active_planes[i++] = 211 to_vkms_plane_state(plane_state); 212 } 213 214 return 0; 215} 216 217static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 218 struct drm_crtc_state *old_state) 219{ 220 drm_crtc_vblank_on(crtc); 221} 222 223static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 224 struct drm_crtc_state *old_state) 225{ 226 drm_crtc_vblank_off(crtc); 227} 228 229static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 230 struct drm_crtc_state *old_crtc_state) 231{ 232 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 233 234 /* This lock is held across the atomic commit to block vblank timer 235 * from scheduling vkms_composer_worker until the composer is updated 236 */ 237 spin_lock_irq(&vkms_output->lock); 238} 239 240static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 241 struct drm_crtc_state *old_crtc_state) 242{ 243 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 244 245 if (crtc->state->event) { 246 spin_lock(&crtc->dev->event_lock); 247 248 if (drm_crtc_vblank_get(crtc) != 0) 249 drm_crtc_send_vblank_event(crtc, crtc->state->event); 250 else 251 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 252 253 spin_unlock(&crtc->dev->event_lock); 254 255 crtc->state->event = NULL; 256 } 257 258 vkms_output->composer_state = to_vkms_crtc_state(crtc->state); 259 260 spin_unlock_irq(&vkms_output->lock); 261} 262 263static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { 264 .atomic_check = vkms_crtc_atomic_check, 265 .atomic_begin = vkms_crtc_atomic_begin, 266 .atomic_flush = vkms_crtc_atomic_flush, 267 .atomic_enable = vkms_crtc_atomic_enable, 268 .atomic_disable = vkms_crtc_atomic_disable, 269}; 270 271int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 272 struct drm_plane *primary, struct drm_plane *cursor) 273{ 274 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc); 275 int ret; 276 277 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor, 278 &vkms_crtc_funcs, NULL); 279 if (ret) { 280 DRM_ERROR("Failed to init CRTC\n"); 281 return ret; 282 } 283 284 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); 285 286 spin_lock_init(&vkms_out->lock); 287 spin_lock_init(&vkms_out->composer_lock); 288 289 vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0); 290 if (!vkms_out->composer_workq) 291 return -ENOMEM; 292 293 return ret; 294} 295