vkms_crtc.c

  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_managed.h>
  8#include <drm/drm_print.h>
  9#include <drm/drm_probe_helper.h>
 10#include <drm/drm_vblank.h>
 11#include <drm/drm_vblank_helper.h>
 12
 13#include "vkms_drv.h"
 14
 15static bool vkms_crtc_handle_vblank_timeout(struct drm_crtc *crtc)
 16{
 17	struct vkms_output *output = drm_crtc_to_vkms_output(crtc);
 18	struct vkms_crtc_state *state;
 19	bool ret, fence_cookie;
 20
 21	fence_cookie = dma_fence_begin_signalling();
 22
 23	spin_lock(&output->lock);
 24	ret = drm_crtc_handle_vblank(crtc);
 25	if (!ret)
 26		DRM_ERROR("vkms failure on handling vblank");
 27
 28	state = output->composer_state;
 29	spin_unlock(&output->lock);
 30
 31	if (state && output->composer_enabled) {
 32		u64 frame = drm_crtc_accurate_vblank_count(crtc);
 33
 34		/* update frame_start only if a queued vkms_composer_worker()
 35		 * has read the data
 36		 */
 37		spin_lock(&output->composer_lock);
 38		if (!state->crc_pending)
 39			state->frame_start = frame;
 40		else
 41			DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n",
 42					 state->frame_start, frame);
 43		state->frame_end = frame;
 44		state->crc_pending = true;
 45		spin_unlock(&output->composer_lock);
 46
 47		ret = queue_work(output->composer_workq, &state->composer_work);
 48		if (!ret)
 49			DRM_DEBUG_DRIVER("Composer worker already queued\n");
 50	}
 51
 52	dma_fence_end_signalling(fence_cookie);
 53
 54	return true;
 55}
 56
 57static struct drm_crtc_state *
 58vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
 59{
 60	struct vkms_crtc_state *vkms_state;
 61
 62	if (WARN_ON(!crtc->state))
 63		return NULL;
 64
 65	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
 66	if (!vkms_state)
 67		return NULL;
 68
 69	__drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
 70
 71	INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
 72
 73	return &vkms_state->base;
 74}
 75
 76static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
 77					   struct drm_crtc_state *state)
 78{
 79	struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
 80
 81	__drm_atomic_helper_crtc_destroy_state(state);
 82
 83	WARN_ON(work_pending(&vkms_state->composer_work));
 84	kfree(vkms_state->active_planes);
 85	kfree(vkms_state);
 86}
 87
 88static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
 89{
 90	struct vkms_crtc_state *vkms_state =
 91		kzalloc(sizeof(*vkms_state), GFP_KERNEL);
 92
 93	if (crtc->state)
 94		vkms_atomic_crtc_destroy_state(crtc, crtc->state);
 95
 96	__drm_atomic_helper_crtc_reset(crtc, &vkms_state->base);
 97	if (vkms_state)
 98		INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
 99}
100
101static const struct drm_crtc_funcs vkms_crtc_funcs = {
102	.set_config             = drm_atomic_helper_set_config,
103	.page_flip              = drm_atomic_helper_page_flip,
104	.reset                  = vkms_atomic_crtc_reset,
105	.atomic_duplicate_state = vkms_atomic_crtc_duplicate_state,
106	.atomic_destroy_state   = vkms_atomic_crtc_destroy_state,
107	DRM_CRTC_VBLANK_TIMER_FUNCS,
108	.get_crc_sources	= vkms_get_crc_sources,
109	.set_crc_source		= vkms_set_crc_source,
110	.verify_crc_source	= vkms_verify_crc_source,
111};
112
113static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
114				  struct drm_atomic_state *state)
115{
116	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
117									  crtc);
118	struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc_state);
119	struct drm_plane *plane;
120	struct drm_plane_state *plane_state;
121	int i = 0, ret;
122
123	if (vkms_state->active_planes)
124		return 0;
125
126	ret = drm_atomic_add_affected_planes(crtc_state->state, crtc);
127	if (ret < 0)
128		return ret;
129
130	drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) {
131		plane_state = drm_atomic_get_new_plane_state(crtc_state->state, plane);
132		WARN_ON(!plane_state);
133
134		if (!plane_state->visible)
135			continue;
136
137		i++;
138	}
139
140	vkms_state->active_planes = kcalloc(i, sizeof(*vkms_state->active_planes), GFP_KERNEL);
141	if (!vkms_state->active_planes)
142		return -ENOMEM;
143	vkms_state->num_active_planes = i;
144
145	i = 0;
146	drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) {
147		plane_state = drm_atomic_get_new_plane_state(crtc_state->state, plane);
148
149		if (!plane_state->visible)
150			continue;
151
152		vkms_state->active_planes[i++] =
153			to_vkms_plane_state(plane_state);
154	}
155
156	return 0;
157}
158
159static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
160				   struct drm_atomic_state *state)
161	__acquires(&vkms_output->lock)
162{
163	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
164
165	/* This lock is held across the atomic commit to block vblank timer
166	 * from scheduling vkms_composer_worker until the composer is updated
167	 */
168	spin_lock_irq(&vkms_output->lock);
169}
170
171static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
172				   struct drm_atomic_state *state)
173	__releases(&vkms_output->lock)
174{
175	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
176
177	if (crtc->state->event) {
178		spin_lock(&crtc->dev->event_lock);
179
180		if (drm_crtc_vblank_get(crtc) != 0)
181			drm_crtc_send_vblank_event(crtc, crtc->state->event);
182		else
183			drm_crtc_arm_vblank_event(crtc, crtc->state->event);
184
185		spin_unlock(&crtc->dev->event_lock);
186
187		crtc->state->event = NULL;
188	}
189
190	vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
191
192	spin_unlock_irq(&vkms_output->lock);
193}
194
195static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
196	.atomic_check	= vkms_crtc_atomic_check,
197	.atomic_begin	= vkms_crtc_atomic_begin,
198	.atomic_flush	= vkms_crtc_atomic_flush,
199	.atomic_enable	= drm_crtc_vblank_atomic_enable,
200	.atomic_disable	= drm_crtc_vblank_atomic_disable,
201	.handle_vblank_timeout = vkms_crtc_handle_vblank_timeout,
202};
203
204struct vkms_output *vkms_crtc_init(struct drm_device *dev, struct drm_plane *primary,
205				   struct drm_plane *cursor)
206{
207	struct vkms_output *vkms_out;
208	struct drm_crtc *crtc;
209	int ret;
210
211	vkms_out = drmm_crtc_alloc_with_planes(dev, struct vkms_output, crtc,
212					       primary, cursor,
213					       &vkms_crtc_funcs, NULL);
214	if (IS_ERR(vkms_out)) {
215		DRM_DEV_ERROR(dev->dev, "Failed to init CRTC\n");
216		return vkms_out;
217	}
218
219	crtc = &vkms_out->crtc;
220
221	drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
222
223	ret = drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE);
224	if (ret) {
225		DRM_ERROR("Failed to set gamma size\n");
226		return ERR_PTR(ret);
227	}
228
229	drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE);
230
231	spin_lock_init(&vkms_out->lock);
232	spin_lock_init(&vkms_out->composer_lock);
233
234	vkms_out->composer_workq = drmm_alloc_ordered_workqueue(dev, "vkms_composer", 0);
235	if (IS_ERR(vkms_out->composer_workq))
236		return ERR_CAST(vkms_out->composer_workq);
237
238	return vkms_out;
239}