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_crtc_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; 107 108 crtc->state = &vkms_state->base; 109 crtc->state->crtc = crtc; 110 } 111 112 static struct drm_crtc_state * 113 vkms_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->crc_work, vkms_crc_work_handle); 127 128 return &vkms_state->base; 129 } 130 131 static 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 if (vkms_state) { 139 flush_work(&vkms_state->crc_work); 140 kfree(vkms_state); 141 } 142 } 143 144 static const struct drm_crtc_funcs vkms_crtc_funcs = { 145 .set_config = drm_atomic_helper_set_config, 146 .destroy = drm_crtc_cleanup, 147 .page_flip = drm_atomic_helper_page_flip, 148 .reset = vkms_atomic_crtc_reset, 149 .atomic_duplicate_state = vkms_atomic_crtc_duplicate_state, 150 .atomic_destroy_state = vkms_atomic_crtc_destroy_state, 151 .enable_vblank = vkms_enable_vblank, 152 .disable_vblank = vkms_disable_vblank, 153 .set_crc_source = vkms_set_crc_source, 154 .verify_crc_source = vkms_verify_crc_source, 155 }; 156 157 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, 158 struct drm_crtc_state *old_state) 159 { 160 drm_crtc_vblank_on(crtc); 161 } 162 163 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, 164 struct drm_crtc_state *old_state) 165 { 166 drm_crtc_vblank_off(crtc); 167 } 168 169 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc, 170 struct drm_crtc_state *old_crtc_state) 171 { 172 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 173 174 /* This lock is held across the atomic commit to block vblank timer 175 * from scheduling vkms_crc_work_handle until the crc_data is updated 176 */ 177 spin_lock_irq(&vkms_output->lock); 178 } 179 180 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, 181 struct drm_crtc_state *old_crtc_state) 182 { 183 struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc); 184 unsigned long flags; 185 186 if (crtc->state->event) { 187 spin_lock_irqsave(&crtc->dev->event_lock, flags); 188 189 if (drm_crtc_vblank_get(crtc) != 0) 190 drm_crtc_send_vblank_event(crtc, crtc->state->event); 191 else 192 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 193 194 spin_unlock_irqrestore(&crtc->dev->event_lock, flags); 195 196 crtc->state->event = NULL; 197 } 198 199 spin_unlock_irq(&vkms_output->lock); 200 } 201 202 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { 203 .atomic_begin = vkms_crtc_atomic_begin, 204 .atomic_flush = vkms_crtc_atomic_flush, 205 .atomic_enable = vkms_crtc_atomic_enable, 206 .atomic_disable = vkms_crtc_atomic_disable, 207 }; 208 209 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 210 struct drm_plane *primary, struct drm_plane *cursor) 211 { 212 struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc); 213 int ret; 214 215 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor, 216 &vkms_crtc_funcs, NULL); 217 if (ret) { 218 DRM_ERROR("Failed to init CRTC\n"); 219 return ret; 220 } 221 222 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); 223 224 spin_lock_init(&vkms_out->lock); 225 spin_lock_init(&vkms_out->state_lock); 226 227 vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0); 228 229 return ret; 230 } 231