xref: /qemu/hw/vfio/display.c (revision b355f08a) 
1 /*
2  * display support for mdev based vgpu devices
3  *
4  * Copyright Red Hat, Inc. 2017
5  *
6  * Authors:
7  *    Gerd Hoffmann
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2.  See
10  * the COPYING file in the top-level directory.
11  */
12 
13 #include "qemu/osdep.h"
14 #include <linux/vfio.h>
15 #include <sys/ioctl.h>
16 
17 #include "hw/display/edid.h"
18 #include "ui/console.h"
19 #include "qapi/error.h"
20 #include "pci.h"
21 #include "trace.h"
22 
23 #ifndef DRM_PLANE_TYPE_PRIMARY
24 # define DRM_PLANE_TYPE_PRIMARY 1
25 # define DRM_PLANE_TYPE_CURSOR  2
26 #endif
27 
28 #define pread_field(_fd, _reg, _ptr, _fld)                              \
29     (sizeof(_ptr->_fld) !=                                              \
30      pread(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                      \
31            _reg->offset + offsetof(typeof(*_ptr), _fld)))
32 
33 #define pwrite_field(_fd, _reg, _ptr, _fld)                             \
34     (sizeof(_ptr->_fld) !=                                              \
35      pwrite(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                     \
36             _reg->offset + offsetof(typeof(*_ptr), _fld)))
37 
38 
39 static void vfio_display_edid_link_up(void *opaque)
40 {
41     VFIOPCIDevice *vdev = opaque;
42     VFIODisplay *dpy = vdev->dpy;
43     int fd = vdev->vbasedev.fd;
44 
45     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP;
46     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
47         goto err;
48     }
49     trace_vfio_display_edid_link_up();
50     return;
51 
52 err:
53     trace_vfio_display_edid_write_error();
54 }
55 
56 static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
57                                      int prefx, int prefy)
58 {
59     VFIODisplay *dpy = vdev->dpy;
60     int fd = vdev->vbasedev.fd;
61     qemu_edid_info edid = {
62         .maxx  = dpy->edid_regs->max_xres,
63         .maxy  = dpy->edid_regs->max_yres,
64         .prefx = prefx ?: vdev->display_xres,
65         .prefy = prefy ?: vdev->display_yres,
66     };
67 
68     timer_del(dpy->edid_link_timer);
69     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
70     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
71         goto err;
72     }
73     trace_vfio_display_edid_link_down();
74 
75     if (!enabled) {
76         return;
77     }
78 
79     if (edid.maxx && edid.prefx > edid.maxx) {
80         edid.prefx = edid.maxx;
81     }
82     if (edid.maxy && edid.prefy > edid.maxy) {
83         edid.prefy = edid.maxy;
84     }
85     qemu_edid_generate(dpy->edid_blob,
86                        dpy->edid_regs->edid_max_size,
87                        &edid);
88     trace_vfio_display_edid_update(edid.prefx, edid.prefy);
89 
90     dpy->edid_regs->edid_size = qemu_edid_size(dpy->edid_blob);
91     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, edid_size)) {
92         goto err;
93     }
94     if (pwrite(fd, dpy->edid_blob, dpy->edid_regs->edid_size,
95                dpy->edid_info->offset + dpy->edid_regs->edid_offset)
96         != dpy->edid_regs->edid_size) {
97         goto err;
98     }
99 
100     timer_mod(dpy->edid_link_timer,
101               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 100);
102     return;
103 
104 err:
105     trace_vfio_display_edid_write_error();
106     return;
107 }
108 
109 static int vfio_display_edid_ui_info(void *opaque, uint32_t idx,
110                                      QemuUIInfo *info)
111 {
112     VFIOPCIDevice *vdev = opaque;
113     VFIODisplay *dpy = vdev->dpy;
114 
115     if (!dpy->edid_regs) {
116         return 0;
117     }
118 
119     if (info->width && info->height) {
120         vfio_display_edid_update(vdev, true, info->width, info->height);
121     } else {
122         vfio_display_edid_update(vdev, false, 0, 0);
123     }
124 
125     return 0;
126 }
127 
128 static void vfio_display_edid_init(VFIOPCIDevice *vdev)
129 {
130     VFIODisplay *dpy = vdev->dpy;
131     int fd = vdev->vbasedev.fd;
132     int ret;
133 
134     ret = vfio_get_dev_region_info(&vdev->vbasedev,
135                                    VFIO_REGION_TYPE_GFX,
136                                    VFIO_REGION_SUBTYPE_GFX_EDID,
137                                    &dpy->edid_info);
138     if (ret) {
139         return;
140     }
141 
142     trace_vfio_display_edid_available();
143     dpy->edid_regs = g_new0(struct vfio_region_gfx_edid, 1);
144     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_offset)) {
145         goto err;
146     }
147     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_max_size)) {
148         goto err;
149     }
150     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_xres)) {
151         goto err;
152     }
153     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_yres)) {
154         goto err;
155     }
156 
157     dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
158 
159     /* if xres + yres properties are unset use the maximum resolution */
160     if (!vdev->display_xres) {
161         vdev->display_xres = dpy->edid_regs->max_xres;
162     }
163     if (!vdev->display_yres) {
164         vdev->display_yres = dpy->edid_regs->max_yres;
165     }
166 
167     dpy->edid_link_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
168                                         vfio_display_edid_link_up, vdev);
169 
170     vfio_display_edid_update(vdev, true, 0, 0);
171     return;
172 
173 err:
174     trace_vfio_display_edid_write_error();
175     g_free(dpy->edid_regs);
176     dpy->edid_regs = NULL;
177     return;
178 }
179 
180 static void vfio_display_edid_exit(VFIODisplay *dpy)
181 {
182     if (!dpy->edid_regs) {
183         return;
184     }
185 
186     g_free(dpy->edid_regs);
187     g_free(dpy->edid_blob);
188     timer_free(dpy->edid_link_timer);
189 }
190 
191 static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
192                                        struct vfio_device_gfx_plane_info *plane)
193 {
194     if (dmabuf->pos_x != plane->x_pos || dmabuf->pos_y != plane->y_pos) {
195         dmabuf->pos_x      = plane->x_pos;
196         dmabuf->pos_y      = plane->y_pos;
197         dmabuf->pos_updates++;
198     }
199     if (dmabuf->hot_x != plane->x_hot || dmabuf->hot_y != plane->y_hot) {
200         dmabuf->hot_x      = plane->x_hot;
201         dmabuf->hot_y      = plane->y_hot;
202         dmabuf->hot_updates++;
203     }
204 }
205 
206 static VFIODMABuf *vfio_display_get_dmabuf(VFIOPCIDevice *vdev,
207                                            uint32_t plane_type)
208 {
209     VFIODisplay *dpy = vdev->dpy;
210     struct vfio_device_gfx_plane_info plane;
211     VFIODMABuf *dmabuf;
212     int fd, ret;
213 
214     memset(&plane, 0, sizeof(plane));
215     plane.argsz = sizeof(plane);
216     plane.flags = VFIO_GFX_PLANE_TYPE_DMABUF;
217     plane.drm_plane_type = plane_type;
218     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
219     if (ret < 0) {
220         return NULL;
221     }
222     if (!plane.drm_format || !plane.size) {
223         return NULL;
224     }
225 
226     QTAILQ_FOREACH(dmabuf, &dpy->dmabuf.bufs, next) {
227         if (dmabuf->dmabuf_id == plane.dmabuf_id) {
228             /* found in list, move to head, return it */
229             QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
230             QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
231             if (plane_type == DRM_PLANE_TYPE_CURSOR) {
232                 vfio_display_update_cursor(dmabuf, &plane);
233             }
234             return dmabuf;
235         }
236     }
237 
238     fd = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_GFX_DMABUF, &plane.dmabuf_id);
239     if (fd < 0) {
240         return NULL;
241     }
242 
243     dmabuf = g_new0(VFIODMABuf, 1);
244     dmabuf->dmabuf_id  = plane.dmabuf_id;
245     dmabuf->buf.width  = plane.width;
246     dmabuf->buf.height = plane.height;
247     dmabuf->buf.stride = plane.stride;
248     dmabuf->buf.fourcc = plane.drm_format;
249     dmabuf->buf.modifier = plane.drm_format_mod;
250     dmabuf->buf.fd     = fd;
251     if (plane_type == DRM_PLANE_TYPE_CURSOR) {
252         vfio_display_update_cursor(dmabuf, &plane);
253     }
254 
255     QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
256     return dmabuf;
257 }
258 
259 static void vfio_display_free_one_dmabuf(VFIODisplay *dpy, VFIODMABuf *dmabuf)
260 {
261     QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
262     dpy_gl_release_dmabuf(dpy->con, &dmabuf->buf);
263     close(dmabuf->buf.fd);
264     g_free(dmabuf);
265 }
266 
267 static void vfio_display_free_dmabufs(VFIOPCIDevice *vdev)
268 {
269     VFIODisplay *dpy = vdev->dpy;
270     VFIODMABuf *dmabuf, *tmp;
271     uint32_t keep = 5;
272 
273     QTAILQ_FOREACH_SAFE(dmabuf, &dpy->dmabuf.bufs, next, tmp) {
274         if (keep > 0) {
275             keep--;
276             continue;
277         }
278         assert(dmabuf != dpy->dmabuf.primary);
279         vfio_display_free_one_dmabuf(dpy, dmabuf);
280     }
281 }
282 
283 static void vfio_display_dmabuf_update(void *opaque)
284 {
285     VFIOPCIDevice *vdev = opaque;
286     VFIODisplay *dpy = vdev->dpy;
287     VFIODMABuf *primary, *cursor;
288     bool free_bufs = false, new_cursor = false;
289 
290     primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
291     if (primary == NULL) {
292         if (dpy->ramfb) {
293             ramfb_display_update(dpy->con, dpy->ramfb);
294         }
295         return;
296     }
297 
298     if (dpy->dmabuf.primary != primary) {
299         dpy->dmabuf.primary = primary;
300         qemu_console_resize(dpy->con,
301                             primary->buf.width, primary->buf.height);
302         dpy_gl_scanout_dmabuf(dpy->con, &primary->buf);
303         free_bufs = true;
304     }
305 
306     cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
307     if (dpy->dmabuf.cursor != cursor) {
308         dpy->dmabuf.cursor = cursor;
309         new_cursor = true;
310         free_bufs = true;
311     }
312 
313     if (cursor && (new_cursor || cursor->hot_updates)) {
314         bool have_hot = (cursor->hot_x != 0xffffffff &&
315                          cursor->hot_y != 0xffffffff);
316         dpy_gl_cursor_dmabuf(dpy->con, &cursor->buf, have_hot,
317                              cursor->hot_x, cursor->hot_y);
318         cursor->hot_updates = 0;
319     } else if (!cursor && new_cursor) {
320         dpy_gl_cursor_dmabuf(dpy->con, NULL, false, 0, 0);
321     }
322 
323     if (cursor && cursor->pos_updates) {
324         dpy_gl_cursor_position(dpy->con,
325                                cursor->pos_x,
326                                cursor->pos_y);
327         cursor->pos_updates = 0;
328     }
329 
330     dpy_gl_update(dpy->con, 0, 0, primary->buf.width, primary->buf.height);
331 
332     if (free_bufs) {
333         vfio_display_free_dmabufs(vdev);
334     }
335 }
336 
337 static int vfio_display_get_flags(void *opaque)
338 {
339     return GRAPHIC_FLAGS_GL | GRAPHIC_FLAGS_DMABUF;
340 }
341 
342 static const GraphicHwOps vfio_display_dmabuf_ops = {
343     .get_flags  = vfio_display_get_flags,
344     .gfx_update = vfio_display_dmabuf_update,
345     .ui_info    = vfio_display_edid_ui_info,
346 };
347 
348 static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
349 {
350     if (!display_opengl) {
351         error_setg(errp, "vfio-display-dmabuf: opengl not available");
352         return -1;
353     }
354 
355     vdev->dpy = g_new0(VFIODisplay, 1);
356     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
357                                           &vfio_display_dmabuf_ops,
358                                           vdev);
359     if (vdev->enable_ramfb) {
360         vdev->dpy->ramfb = ramfb_setup(errp);
361     }
362     vfio_display_edid_init(vdev);
363     return 0;
364 }
365 
366 static void vfio_display_dmabuf_exit(VFIODisplay *dpy)
367 {
368     VFIODMABuf *dmabuf;
369 
370     if (QTAILQ_EMPTY(&dpy->dmabuf.bufs)) {
371         return;
372     }
373 
374     while ((dmabuf = QTAILQ_FIRST(&dpy->dmabuf.bufs)) != NULL) {
375         vfio_display_free_one_dmabuf(dpy, dmabuf);
376     }
377 }
378 
379 /* ---------------------------------------------------------------------- */
380 void vfio_display_reset(VFIOPCIDevice *vdev)
381 {
382     if (!vdev || !vdev->dpy || !vdev->dpy->con ||
383         !vdev->dpy->dmabuf.primary) {
384         return;
385     }
386 
387     dpy_gl_scanout_disable(vdev->dpy->con);
388     vfio_display_dmabuf_exit(vdev->dpy);
389     dpy_gfx_update_full(vdev->dpy->con);
390 }
391 
392 static void vfio_display_region_update(void *opaque)
393 {
394     VFIOPCIDevice *vdev = opaque;
395     VFIODisplay *dpy = vdev->dpy;
396     struct vfio_device_gfx_plane_info plane = {
397         .argsz = sizeof(plane),
398         .flags = VFIO_GFX_PLANE_TYPE_REGION
399     };
400     pixman_format_code_t format;
401     int ret;
402 
403     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
404     if (ret < 0) {
405         error_report("ioctl VFIO_DEVICE_QUERY_GFX_PLANE: %s",
406                      strerror(errno));
407         return;
408     }
409     if (!plane.drm_format || !plane.size) {
410         if (dpy->ramfb) {
411             ramfb_display_update(dpy->con, dpy->ramfb);
412             dpy->region.surface = NULL;
413         }
414         return;
415     }
416     format = qemu_drm_format_to_pixman(plane.drm_format);
417     if (!format) {
418         return;
419     }
420 
421     if (dpy->region.buffer.size &&
422         dpy->region.buffer.nr != plane.region_index) {
423         /* region changed */
424         vfio_region_exit(&dpy->region.buffer);
425         vfio_region_finalize(&dpy->region.buffer);
426         dpy->region.surface = NULL;
427     }
428 
429     if (dpy->region.surface &&
430         (surface_width(dpy->region.surface) != plane.width ||
431          surface_height(dpy->region.surface) != plane.height ||
432          surface_format(dpy->region.surface) != format)) {
433         /* size changed */
434         dpy->region.surface = NULL;
435     }
436 
437     if (!dpy->region.buffer.size) {
438         /* mmap region */
439         ret = vfio_region_setup(OBJECT(vdev), &vdev->vbasedev,
440                                 &dpy->region.buffer,
441                                 plane.region_index,
442                                 "display");
443         if (ret != 0) {
444             error_report("%s: vfio_region_setup(%d): %s",
445                          __func__, plane.region_index, strerror(-ret));
446             goto err;
447         }
448         ret = vfio_region_mmap(&dpy->region.buffer);
449         if (ret != 0) {
450             error_report("%s: vfio_region_mmap(%d): %s", __func__,
451                          plane.region_index, strerror(-ret));
452             goto err;
453         }
454         assert(dpy->region.buffer.mmaps[0].mmap != NULL);
455     }
456 
457     if (dpy->region.surface == NULL) {
458         /* create surface */
459         dpy->region.surface = qemu_create_displaysurface_from
460             (plane.width, plane.height, format,
461              plane.stride, dpy->region.buffer.mmaps[0].mmap);
462         dpy_gfx_replace_surface(dpy->con, dpy->region.surface);
463     }
464 
465     /* full screen update */
466     dpy_gfx_update(dpy->con, 0, 0,
467                    surface_width(dpy->region.surface),
468                    surface_height(dpy->region.surface));
469     return;
470 
471 err:
472     vfio_region_exit(&dpy->region.buffer);
473     vfio_region_finalize(&dpy->region.buffer);
474 }
475 
476 static const GraphicHwOps vfio_display_region_ops = {
477     .gfx_update = vfio_display_region_update,
478 };
479 
480 static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
481 {
482     vdev->dpy = g_new0(VFIODisplay, 1);
483     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
484                                           &vfio_display_region_ops,
485                                           vdev);
486     if (vdev->enable_ramfb) {
487         vdev->dpy->ramfb = ramfb_setup(errp);
488     }
489     return 0;
490 }
491 
492 static void vfio_display_region_exit(VFIODisplay *dpy)
493 {
494     if (!dpy->region.buffer.size) {
495         return;
496     }
497 
498     vfio_region_exit(&dpy->region.buffer);
499     vfio_region_finalize(&dpy->region.buffer);
500 }
501 
502 /* ---------------------------------------------------------------------- */
503 
504 int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
505 {
506     struct vfio_device_gfx_plane_info probe;
507     int ret;
508 
509     memset(&probe, 0, sizeof(probe));
510     probe.argsz = sizeof(probe);
511     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
512     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
513     if (ret == 0) {
514         return vfio_display_dmabuf_init(vdev, errp);
515     }
516 
517     memset(&probe, 0, sizeof(probe));
518     probe.argsz = sizeof(probe);
519     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
520     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
521     if (ret == 0) {
522         return vfio_display_region_init(vdev, errp);
523     }
524 
525     if (vdev->display == ON_OFF_AUTO_AUTO) {
526         /* not an error in automatic mode */
527         return 0;
528     }
529 
530     error_setg(errp, "vfio: device doesn't support any (known) display method");
531     return -1;
532 }
533 
534 void vfio_display_finalize(VFIOPCIDevice *vdev)
535 {
536     if (!vdev->dpy) {
537         return;
538     }
539 
540     graphic_console_close(vdev->dpy->con);
541     vfio_display_dmabuf_exit(vdev->dpy);
542     vfio_display_region_exit(vdev->dpy);
543     vfio_display_edid_exit(vdev->dpy);
544     g_free(vdev->dpy);
545 }
546