1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include "vkms_drv.h" 4 #include <drm/drm_atomic_helper.h> 5 #include <drm/drm_probe_helper.h> 6 7 static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) 8 { 9 struct vkms_output *output = container_of(timer, struct vkms_output, 10 vblank_hrtimer); 11 struct drm_crtc *crtc = &output->crtc; 12 struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state); 13 u64 ret_overrun; 14 bool ret; 15 16 spin_lock(&output->lock); 17 18 ret = drm_crtc_handle_vblank(crtc); 19 if (!ret) 20 DRM_ERROR("vkms failure on handling vblank"); 21 22 if (state && output->crc_enabled) { 23 u64 frame = drm_crtc_accurate_vblank_count(crtc); 24 25 /* update frame_start only if a queued vkms_crc_work_handle() 26 * has read the data 27 */ 28 spin_lock(&output->state_lock); 29 if (!state->frame_start) 30 state->frame_start = frame; 31 spin_unlock(&output->state_lock); 32 33 ret = queue_work(output->crc_workq, &state->crc_work); 34 if (!ret) 35 DRM_WARN("failed to queue vkms_crc_work_handle"); 36 } 37 38 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, 39 output->period_ns); 40 WARN_ON(ret_overrun != 1); 41 42 spin_unlock(&output->lock); 43 44 return HRTIMER_RESTART; 45 } 46 47 static int vkms_enable_vblank(struct drm_crtc *crtc) 48 { 49 struct drm_device *dev = crtc->dev; 50 unsigned int pipe = drm_crtc_index(crtc); 51 struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; 52 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 53 54 drm_calc_timestamping_constants(crtc, &crtc->mode); 55 56 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 57 out->vblank_hrtimer.function = &vkms_vblank_simulate; 58 out->period_ns = ktime_set(0, vblank->framedur_ns); 59 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); 60 61 return 0; 62 } 63 64 static void vkms_disable_vblank(struct drm_crtc *crtc) 65 { 66 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 67 68 hrtimer_cancel(&out->vblank_hrtimer); 69 } 70 71 bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, 72 int *max_error, ktime_t *vblank_time, 73 bool in_vblank_irq) 74 { 75 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); 76 struct vkms_output *output = &vkmsdev->output; 77 78 *vblank_time = output->vblank_hrtimer.node.expires; 79 80 if (!in_vblank_irq) 81 *vblank_time -= output->period_ns; 82 83 return true; 84 } 85 86 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc) 87 { 88 struct vkms_crtc_state *vkms_state = NULL; 89 90 if (crtc->state) { 91 vkms_state = to_vkms_crtc_state(crtc->state); 92 __drm_atomic_helper_crtc_destroy_state(crtc->state); 93 kfree(vkms_state); 94 crtc->state = NULL; 95 } 96 97 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 98 if (!vkms_state) 99 return; 100 INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle); 101 102 crtc->state = &vkms_state->base; 103 crtc->state->crtc = crtc; 104 } 105 106 static struct drm_crtc_state * 107 vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc) 108 { 109 struct vkms_crtc_state *vkms_state; 110 111 if (WARN_ON(!crtc->state)) 112 return NULL; 113 114 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 115 if (!vkms_state) 116 return NULL; 117 118 __drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base); 119 120 INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle); 121 122 return &vkms_state->base; 123 } 124 125 static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc, 126 struct drm_crtc_state *state) 127 { 128 struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state); 129 130 __drm_atomic_helper_crtc_destroy_state(state); 131 132 if (vkms_state) { 133 flush_work(&vkms_state->crc_work); 134 kfree(vkms_state); 135 } 136 } 137 138 static const struct drm_crtc_funcs vkms_crtc_funcs = { 139 .set_config = drm_atomic_helper_set_config, 140 .destroy = drm_crtc_cleanup, 141 .page_flip = drm_atomic_helper_page_flip, 142 .reset = vkms_atomic_crtc_reset, 143 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state, 144 .atomic_destroy_state = vkms_atomic_crtc_destroy_state, 145 .enable_vblank = vkms_enable_vblank, 146 .disable_vblank = vkms_disable_vblank, 147 .set_crc_source = vkms_set_crc_source, 148 .verify_crc_source = vkms_verify_crc_source, 149 }; 150 151 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 152 struct drm_crtc_state *old_state) 153 { 154 drm_crtc_vblank_on(crtc); 155 } 156 157 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 158 struct drm_crtc_state *old_state) 159 { 160 drm_crtc_vblank_off(crtc); 161 } 162 163 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 164 struct drm_crtc_state *old_crtc_state) 165 { 166 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 167 168 /* This lock is held across the atomic commit to block vblank timer 169 * from scheduling vkms_crc_work_handle until the crc_data is updated 170 */ 171 spin_lock_irq(&vkms_output->lock); 172 } 173 174 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 175 struct drm_crtc_state *old_crtc_state) 176 { 177 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 178 unsigned long flags; 179 180 if (crtc->state->event) { 181 spin_lock_irqsave(&crtc->dev->event_lock, flags); 182 183 if (drm_crtc_vblank_get(crtc) != 0) 184 drm_crtc_send_vblank_event(crtc, crtc->state->event); 185 else 186 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 187 188 spin_unlock_irqrestore(&crtc->dev->event_lock, flags); 189 190 crtc->state->event = NULL; 191 } 192 193 spin_unlock_irq(&vkms_output->lock); 194 } 195 196 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { 197 .atomic_begin = vkms_crtc_atomic_begin, 198 .atomic_flush = vkms_crtc_atomic_flush, 199 .atomic_enable = vkms_crtc_atomic_enable, 200 .atomic_disable = vkms_crtc_atomic_disable, 201 }; 202 203 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 204 struct drm_plane *primary, struct drm_plane *cursor) 205 { 206 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc); 207 int ret; 208 209 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor, 210 &vkms_crtc_funcs, NULL); 211 if (ret) { 212 DRM_ERROR("Failed to init CRTC\n"); 213 return ret; 214 } 215 216 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); 217 218 spin_lock_init(&vkms_out->lock); 219 spin_lock_init(&vkms_out->state_lock); 220 221 vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0); 222 223 return ret; 224 } 225