virtgpu_display.c

  1/*
  2 * Copyright (C) 2015 Red Hat, Inc.
  3 * All Rights Reserved.
  4 *
  5 * Authors:
  6 *    Dave Airlie
  7 *    Alon Levy
  8 *
  9 * Permission is hereby granted, free of charge, to any person obtaining a
 10 * copy of this software and associated documentation files (the "Software"),
 11 * to deal in the Software without restriction, including without limitation
 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 13 * and/or sell copies of the Software, and to permit persons to whom the
 14 * Software is furnished to do so, subject to the following conditions:
 15 *
 16 * The above copyright notice and this permission notice shall be included in
 17 * all copies or substantial portions of the Software.
 18 *
 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 25 * OTHER DEALINGS IN THE SOFTWARE.
 26 */
 27
 28#include <drm/drm_atomic_helper.h>
 29#include <drm/drm_damage_helper.h>
 30#include <drm/drm_edid.h>
 31#include <drm/drm_fourcc.h>
 32#include <drm/drm_gem_framebuffer_helper.h>
 33#include <drm/drm_print.h>
 34#include <drm/drm_probe_helper.h>
 35#include <drm/drm_simple_kms_helper.h>
 36#include <drm/drm_vblank.h>
 37#include <drm/drm_vblank_helper.h>
 38
 39#include "virtgpu_drv.h"
 40
 41#define XRES_MIN    32
 42#define YRES_MIN    32
 43
 44#define XRES_DEF  1024
 45#define YRES_DEF   768
 46
 47#define XRES_MAX  8192
 48#define YRES_MAX  8192
 49
 50#define drm_connector_to_virtio_gpu_output(x) \
 51	container_of(x, struct virtio_gpu_output, conn)
 52
 53static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
 54	.set_config             = drm_atomic_helper_set_config,
 55	.destroy                = drm_crtc_cleanup,
 56
 57	.page_flip              = drm_atomic_helper_page_flip,
 58	.reset                  = drm_atomic_helper_crtc_reset,
 59	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 60	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 61	DRM_CRTC_VBLANK_TIMER_FUNCS,
 62};
 63
 64static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
 65	.create_handle = drm_gem_fb_create_handle,
 66	.destroy = drm_gem_fb_destroy,
 67	.dirty = drm_atomic_helper_dirtyfb,
 68};
 69
 70static int
 71virtio_gpu_framebuffer_init(struct drm_device *dev,
 72			    struct virtio_gpu_framebuffer *vgfb,
 73			    const struct drm_format_info *info,
 74			    const struct drm_mode_fb_cmd2 *mode_cmd,
 75			    struct drm_gem_object *obj)
 76{
 77	int ret;
 78
 79	vgfb->base.obj[0] = obj;
 80
 81	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, info, mode_cmd);
 82
 83	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
 84	if (ret) {
 85		vgfb->base.obj[0] = NULL;
 86		return ret;
 87	}
 88	return 0;
 89}
 90
 91static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 92{
 93	struct drm_device *dev = crtc->dev;
 94	struct virtio_gpu_device *vgdev = dev->dev_private;
 95	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 96
 97	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 98				   crtc->mode.hdisplay,
 99				   crtc->mode.vdisplay, 0, 0);
100	virtio_gpu_notify(vgdev);
101}
102
103static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
104					  struct drm_atomic_state *state)
105{
106	drm_crtc_vblank_on(crtc);
107}
108
109static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
110					   struct drm_atomic_state *state)
111{
112	struct drm_device *dev = crtc->dev;
113	struct virtio_gpu_device *vgdev = dev->dev_private;
114	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
115
116	drm_crtc_vblank_off(crtc);
117
118	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
119	virtio_gpu_notify(vgdev);
120}
121
122static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
123					struct drm_atomic_state *state)
124{
125	return 0;
126}
127
128static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
129					 struct drm_atomic_state *state)
130{
131	struct drm_device *dev = crtc->dev;
132	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
133	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
134	struct drm_pending_vblank_event *event;
135
136	/*
137	 * virtio-gpu can't do modeset and plane update operations
138	 * independent from each other.  So the actual modeset happens
139	 * in the plane update callback, and here we just check
140	 * whenever we must force the modeset.
141	 */
142	if (drm_atomic_crtc_needs_modeset(crtc_state))
143		output->needs_modeset = true;
144
145	spin_lock_irq(&dev->event_lock);
146
147	event = crtc_state->event;
148	crtc_state->event = NULL;
149
150	if (event) {
151		if (drm_crtc_vblank_get(crtc) == 0)
152			drm_crtc_arm_vblank_event(crtc, event);
153		else
154			drm_crtc_send_vblank_event(crtc, event);
155	}
156
157	spin_unlock_irq(&dev->event_lock);
158}
159
160static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
161	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
162	.atomic_check  = virtio_gpu_crtc_atomic_check,
163	.atomic_flush  = virtio_gpu_crtc_atomic_flush,
164	.atomic_enable = virtio_gpu_crtc_atomic_enable,
165	.atomic_disable = virtio_gpu_crtc_atomic_disable,
166};
167
168static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
169				    struct drm_display_mode *mode,
170				    struct drm_display_mode *adjusted_mode)
171{
172}
173
174static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
175{
176}
177
178static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
179{
180}
181
182static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
183{
184	struct virtio_gpu_output *output =
185		drm_connector_to_virtio_gpu_output(connector);
186	struct drm_display_mode *mode = NULL;
187	int count, width, height;
188
189	count = drm_edid_connector_add_modes(connector);
190	if (count)
191		return count;
192
193	width  = le32_to_cpu(output->info.r.width);
194	height = le32_to_cpu(output->info.r.height);
195	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
196
197	if (width == 0 || height == 0) {
198		drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
199	} else {
200		DRM_DEBUG("add mode: %dx%d\n", width, height);
201		mode = drm_cvt_mode(connector->dev, width, height, 60,
202				    false, false, false);
203		if (!mode)
204			return count;
205		mode->type |= DRM_MODE_TYPE_PREFERRED;
206		drm_mode_probed_add(connector, mode);
207		count++;
208	}
209
210	return count;
211}
212
213static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
214				      const struct drm_display_mode *mode)
215{
216	struct virtio_gpu_output *output =
217		drm_connector_to_virtio_gpu_output(connector);
218	int width, height;
219
220	width  = le32_to_cpu(output->info.r.width);
221	height = le32_to_cpu(output->info.r.height);
222
223	if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
224		return MODE_OK;
225	if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
226		return MODE_OK;
227	if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
228	    mode->vdisplay <= height && mode->vdisplay >= height - 16)
229		return MODE_OK;
230
231	DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
232	return MODE_BAD;
233}
234
235static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
236	.mode_set   = virtio_gpu_enc_mode_set,
237	.enable     = virtio_gpu_enc_enable,
238	.disable    = virtio_gpu_enc_disable,
239};
240
241static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
242	.get_modes    = virtio_gpu_conn_get_modes,
243	.mode_valid   = virtio_gpu_conn_mode_valid,
244};
245
246static enum drm_connector_status virtio_gpu_conn_detect(
247			struct drm_connector *connector,
248			bool force)
249{
250	struct virtio_gpu_output *output =
251		drm_connector_to_virtio_gpu_output(connector);
252
253	if (output->info.enabled)
254		return connector_status_connected;
255	else
256		return connector_status_disconnected;
257}
258
259static void virtio_gpu_conn_destroy(struct drm_connector *connector)
260{
261	drm_connector_unregister(connector);
262	drm_connector_cleanup(connector);
263}
264
265static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
266	.detect = virtio_gpu_conn_detect,
267	.fill_modes = drm_helper_probe_single_connector_modes,
268	.destroy = virtio_gpu_conn_destroy,
269	.reset = drm_atomic_helper_connector_reset,
270	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
271	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
272};
273
274static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
275{
276	struct drm_device *dev = vgdev->ddev;
277	struct virtio_gpu_output *output = vgdev->outputs + index;
278	struct drm_connector *connector = &output->conn;
279	struct drm_encoder *encoder = &output->enc;
280	struct drm_crtc *crtc = &output->crtc;
281	struct drm_plane *primary, *cursor;
282	int ret;
283
284	output->index = index;
285	if (index == 0) {
286		output->info.enabled = cpu_to_le32(true);
287		output->info.r.width = cpu_to_le32(XRES_DEF);
288		output->info.r.height = cpu_to_le32(YRES_DEF);
289	}
290
291	primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
292	if (IS_ERR(primary))
293		return PTR_ERR(primary);
294	cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
295	if (IS_ERR(cursor))
296		return PTR_ERR(cursor);
297	ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
298					&virtio_gpu_crtc_funcs, NULL);
299	if (ret)
300		return ret;
301	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
302
303	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
304			   DRM_MODE_CONNECTOR_VIRTUAL);
305	drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
306	if (vgdev->has_edid)
307		drm_connector_attach_edid_property(connector);
308
309	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
310	drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
311	encoder->possible_crtcs = 1 << index;
312
313	drm_connector_attach_encoder(connector, encoder);
314	drm_connector_register(connector);
315	return 0;
316}
317
318static struct drm_framebuffer *
319virtio_gpu_user_framebuffer_create(struct drm_device *dev,
320				   struct drm_file *file_priv,
321				   const struct drm_format_info *info,
322				   const struct drm_mode_fb_cmd2 *mode_cmd)
323{
324	struct drm_gem_object *obj = NULL;
325	struct virtio_gpu_framebuffer *virtio_gpu_fb;
326	int ret;
327
328	if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
329	    mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
330		return ERR_PTR(-ENOENT);
331
332	/* lookup object associated with res handle */
333	obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
334	if (!obj)
335		return ERR_PTR(-EINVAL);
336
337	virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
338	if (virtio_gpu_fb == NULL) {
339		drm_gem_object_put(obj);
340		return ERR_PTR(-ENOMEM);
341	}
342
343	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, info, mode_cmd, obj);
344	if (ret) {
345		kfree(virtio_gpu_fb);
346		drm_gem_object_put(obj);
347		return NULL;
348	}
349
350	return &virtio_gpu_fb->base;
351}
352
353static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
354	.fb_create = virtio_gpu_user_framebuffer_create,
355	.atomic_check = drm_atomic_helper_check,
356	.atomic_commit = drm_atomic_helper_commit,
357};
358
359int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
360{
361	int i, ret;
362
363	if (!vgdev->num_scanouts)
364		return 0;
365
366	ret = drmm_mode_config_init(vgdev->ddev);
367	if (ret)
368		return ret;
369
370	vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
371	vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
372
373	/* modes will be validated against the framebuffer size */
374	vgdev->ddev->mode_config.min_width = XRES_MIN;
375	vgdev->ddev->mode_config.min_height = YRES_MIN;
376	vgdev->ddev->mode_config.max_width = XRES_MAX;
377	vgdev->ddev->mode_config.max_height = YRES_MAX;
378
379	vgdev->ddev->mode_config.fb_modifiers_not_supported = true;
380
381	for (i = 0 ; i < vgdev->num_scanouts; ++i)
382		vgdev_output_init(vgdev, i);
383
384	ret = drm_vblank_init(vgdev->ddev, vgdev->num_scanouts);
385	if (ret)
386		return ret;
387
388	drm_mode_config_reset(vgdev->ddev);
389	return 0;
390}
391
392void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
393{
394	int i;
395
396	if (!vgdev->num_scanouts)
397		return;
398
399	for (i = 0 ; i < vgdev->num_scanouts; ++i)
400		drm_edid_free(vgdev->outputs[i].drm_edid);
401}