1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License as published by 5 * the Free Software Foundation; either version 2 of the License, or 6 * (at your option) any later version. 7 */ 8 9 #include "vkms_drv.h" 10 #include <drm/drm_atomic_helper.h> 11 #include <drm/drm_probe_helper.h> 12 13 static void _vblank_handle(struct vkms_output *output) 14 { 15 struct drm_crtc *crtc = &output->crtc; 16 struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state); 17 bool ret; 18 19 spin_lock(&output->lock); 20 ret = drm_crtc_handle_vblank(crtc); 21 if (!ret) 22 DRM_ERROR("vkms failure on handling vblank"); 23 24 if (state && output->crc_enabled) { 25 u64 frame = drm_crtc_accurate_vblank_count(crtc); 26 27 /* update frame_start only if a queued vkms_crc_work_handle() 28 * has read the data 29 */ 30 spin_lock(&output->state_lock); 31 if (!state->frame_start) 32 state->frame_start = frame; 33 spin_unlock(&output->state_lock); 34 35 ret = queue_work(output->crc_workq, &state->crc_work); 36 if (!ret) 37 DRM_WARN("failed to queue vkms_crc_work_handle"); 38 } 39 40 spin_unlock(&output->lock); 41 } 42 43 static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) 44 { 45 struct vkms_output *output = container_of(timer, struct vkms_output, 46 vblank_hrtimer); 47 int ret_overrun; 48 49 _vblank_handle(output); 50 51 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, 52 output->period_ns); 53 54 return HRTIMER_RESTART; 55 } 56 57 static int vkms_enable_vblank(struct drm_crtc *crtc) 58 { 59 struct drm_device *dev = crtc->dev; 60 unsigned int pipe = drm_crtc_index(crtc); 61 struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; 62 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 63 64 drm_calc_timestamping_constants(crtc, &crtc->mode); 65 66 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 67 out->vblank_hrtimer.function = &vkms_vblank_simulate; 68 out->period_ns = ktime_set(0, vblank->framedur_ns); 69 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); 70 71 return 0; 72 } 73 74 static void vkms_disable_vblank(struct drm_crtc *crtc) 75 { 76 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 77 78 hrtimer_cancel(&out->vblank_hrtimer); 79 } 80 81 bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, 82 int *max_error, ktime_t *vblank_time, 83 bool in_vblank_irq) 84 { 85 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); 86 struct vkms_output *output = &vkmsdev->output; 87 88 *vblank_time = output->vblank_hrtimer.node.expires; 89 90 return true; 91 } 92 93 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc) 94 { 95 struct vkms_crtc_state *vkms_state = NULL; 96 97 if (crtc->state) { 98 vkms_state = to_vkms_crtc_state(crtc->state); 99 __drm_atomic_helper_crtc_destroy_state(crtc->state); 100 kfree(vkms_state); 101 crtc->state = NULL; 102 } 103 104 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 105 if (!vkms_state) 106 return; 107 INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle); 108 109 crtc->state = &vkms_state->base; 110 crtc->state->crtc = crtc; 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->crc_work, vkms_crc_work_handle); 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 if (vkms_state) { 140 flush_work(&vkms_state->crc_work); 141 kfree(vkms_state); 142 } 143 } 144 145 static const struct drm_crtc_funcs vkms_crtc_funcs = { 146 .set_config = drm_atomic_helper_set_config, 147 .destroy = drm_crtc_cleanup, 148 .page_flip = drm_atomic_helper_page_flip, 149 .reset = vkms_atomic_crtc_reset, 150 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state, 151 .atomic_destroy_state = vkms_atomic_crtc_destroy_state, 152 .enable_vblank = vkms_enable_vblank, 153 .disable_vblank = vkms_disable_vblank, 154 .set_crc_source = vkms_set_crc_source, 155 .verify_crc_source = vkms_verify_crc_source, 156 }; 157 158 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 159 struct drm_crtc_state *old_state) 160 { 161 drm_crtc_vblank_on(crtc); 162 } 163 164 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 165 struct drm_crtc_state *old_state) 166 { 167 drm_crtc_vblank_off(crtc); 168 } 169 170 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 171 struct drm_crtc_state *old_crtc_state) 172 { 173 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 174 175 /* This lock is held across the atomic commit to block vblank timer 176 * from scheduling vkms_crc_work_handle until the crc_data is updated 177 */ 178 spin_lock_irq(&vkms_output->lock); 179 } 180 181 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 182 struct drm_crtc_state *old_crtc_state) 183 { 184 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 185 unsigned long flags; 186 187 if (crtc->state->event) { 188 spin_lock_irqsave(&crtc->dev->event_lock, flags); 189 190 if (drm_crtc_vblank_get(crtc) != 0) 191 drm_crtc_send_vblank_event(crtc, crtc->state->event); 192 else 193 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 194 195 spin_unlock_irqrestore(&crtc->dev->event_lock, flags); 196 197 crtc->state->event = NULL; 198 } 199 200 spin_unlock_irq(&vkms_output->lock); 201 } 202 203 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { 204 .atomic_begin = vkms_crtc_atomic_begin, 205 .atomic_flush = vkms_crtc_atomic_flush, 206 .atomic_enable = vkms_crtc_atomic_enable, 207 .atomic_disable = vkms_crtc_atomic_disable, 208 }; 209 210 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 211 struct drm_plane *primary, struct drm_plane *cursor) 212 { 213 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc); 214 int ret; 215 216 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor, 217 &vkms_crtc_funcs, NULL); 218 if (ret) { 219 DRM_ERROR("Failed to init CRTC\n"); 220 return ret; 221 } 222 223 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); 224 225 spin_lock_init(&vkms_out->lock); 226 spin_lock_init(&vkms_out->state_lock); 227 228 vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0); 229 230 return ret; 231 } 232