xref: /qemu/hw/vfio/display.c (revision 83ecdb18) 
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 "qemu/error-report.h"
18 #include "hw/display/edid.h"
19 #include "ui/console.h"
20 #include "qapi/error.h"
21 #include "pci.h"
22 #include "trace.h"
23 
24 #ifndef DRM_PLANE_TYPE_PRIMARY
25 # define DRM_PLANE_TYPE_PRIMARY 1
26 # define DRM_PLANE_TYPE_CURSOR  2
27 #endif
28 
29 #define pread_field(_fd, _reg, _ptr, _fld)                              \
30     (sizeof(_ptr->_fld) !=                                              \
31      pread(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                      \
32            _reg->offset + offsetof(typeof(*_ptr), _fld)))
33 
34 #define pwrite_field(_fd, _reg, _ptr, _fld)                             \
35     (sizeof(_ptr->_fld) !=                                              \
36      pwrite(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                     \
37             _reg->offset + offsetof(typeof(*_ptr), _fld)))
38 
39 
40 static void vfio_display_edid_link_up(void *opaque)
41 {
42     VFIOPCIDevice *vdev = opaque;
43     VFIODisplay *dpy = vdev->dpy;
44     int fd = vdev->vbasedev.fd;
45 
46     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP;
47     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
48         goto err;
49     }
50     trace_vfio_display_edid_link_up();
51     return;
52 
53 err:
54     trace_vfio_display_edid_write_error();
55 }
56 
57 static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
58                                      int prefx, int prefy)
59 {
60     VFIODisplay *dpy = vdev->dpy;
61     int fd = vdev->vbasedev.fd;
62     qemu_edid_info edid = {
63         .maxx  = dpy->edid_regs->max_xres,
64         .maxy  = dpy->edid_regs->max_yres,
65         .prefx = prefx ?: vdev->display_xres,
66         .prefy = prefy ?: vdev->display_yres,
67     };
68 
69     timer_del(dpy->edid_link_timer);
70     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
71     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
72         goto err;
73     }
74     trace_vfio_display_edid_link_down();
75 
76     if (!enabled) {
77         return;
78     }
79 
80     if (edid.maxx && edid.prefx > edid.maxx) {
81         edid.prefx = edid.maxx;
82     }
83     if (edid.maxy && edid.prefy > edid.maxy) {
84         edid.prefy = edid.maxy;
85     }
86     qemu_edid_generate(dpy->edid_blob,
87                        dpy->edid_regs->edid_max_size,
88                        &edid);
89     trace_vfio_display_edid_update(edid.prefx, edid.prefy);
90 
91     dpy->edid_regs->edid_size = qemu_edid_size(dpy->edid_blob);
92     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, edid_size)) {
93         goto err;
94     }
95     if (pwrite(fd, dpy->edid_blob, dpy->edid_regs->edid_size,
96                dpy->edid_info->offset + dpy->edid_regs->edid_offset)
97         != dpy->edid_regs->edid_size) {
98         goto err;
99     }
100 
101     timer_mod(dpy->edid_link_timer,
102               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 100);
103     return;
104 
105 err:
106     trace_vfio_display_edid_write_error();
107     return;
108 }
109 
110 static void vfio_display_edid_ui_info(void *opaque, uint32_t idx,
111                                       QemuUIInfo *info)
112 {
113     VFIOPCIDevice *vdev = opaque;
114     VFIODisplay *dpy = vdev->dpy;
115 
116     if (!dpy->edid_regs) {
117         return;
118     }
119 
120     if (info->width && info->height) {
121         vfio_display_edid_update(vdev, true, info->width, info->height);
122     } else {
123         vfio_display_edid_update(vdev, false, 0, 0);
124     }
125 }
126 
127 static void vfio_display_edid_init(VFIOPCIDevice *vdev)
128 {
129     VFIODisplay *dpy = vdev->dpy;
130     int fd = vdev->vbasedev.fd;
131     int ret;
132 
133     ret = vfio_get_dev_region_info(&vdev->vbasedev,
134                                    VFIO_REGION_TYPE_GFX,
135                                    VFIO_REGION_SUBTYPE_GFX_EDID,
136                                    &dpy->edid_info);
137     if (ret) {
138         return;
139     }
140 
141     trace_vfio_display_edid_available();
142     dpy->edid_regs = g_new0(struct vfio_region_gfx_edid, 1);
143     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_offset)) {
144         goto err;
145     }
146     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_max_size)) {
147         goto err;
148     }
149     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_xres)) {
150         goto err;
151     }
152     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_yres)) {
153         goto err;
154     }
155 
156     dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
157 
158     /* if xres + yres properties are unset use the maximum resolution */
159     if (!vdev->display_xres) {
160         vdev->display_xres = dpy->edid_regs->max_xres;
161     }
162     if (!vdev->display_yres) {
163         vdev->display_yres = dpy->edid_regs->max_yres;
164     }
165 
166     dpy->edid_link_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
167                                         vfio_display_edid_link_up, vdev);
168 
169     vfio_display_edid_update(vdev, true, 0, 0);
170     return;
171 
172 err:
173     trace_vfio_display_edid_write_error();
174     g_free(dpy->edid_regs);
175     dpy->edid_regs = NULL;
176     return;
177 }
178 
179 static void vfio_display_edid_exit(VFIODisplay *dpy)
180 {
181     if (!dpy->edid_regs) {
182         return;
183     }
184 
185     g_free(dpy->edid_regs);
186     g_free(dpy->edid_blob);
187     timer_free(dpy->edid_link_timer);
188 }
189 
190 static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
191                                        struct vfio_device_gfx_plane_info *plane)
192 {
193     if (dmabuf->pos_x != plane->x_pos || dmabuf->pos_y != plane->y_pos) {
194         dmabuf->pos_x      = plane->x_pos;
195         dmabuf->pos_y      = plane->y_pos;
196         dmabuf->pos_updates++;
197     }
198     if (dmabuf->hot_x != plane->x_hot || dmabuf->hot_y != plane->y_hot) {
199         dmabuf->hot_x      = plane->x_hot;
200         dmabuf->hot_y      = plane->y_hot;
201         dmabuf->hot_updates++;
202     }
203 }
204 
205 static VFIODMABuf *vfio_display_get_dmabuf(VFIOPCIDevice *vdev,
206                                            uint32_t plane_type)
207 {
208     VFIODisplay *dpy = vdev->dpy;
209     struct vfio_device_gfx_plane_info plane;
210     VFIODMABuf *dmabuf;
211     int fd, ret;
212 
213     memset(&plane, 0, sizeof(plane));
214     plane.argsz = sizeof(plane);
215     plane.flags = VFIO_GFX_PLANE_TYPE_DMABUF;
216     plane.drm_plane_type = plane_type;
217     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
218     if (ret < 0) {
219         return NULL;
220     }
221     if (!plane.drm_format || !plane.size) {
222         return NULL;
223     }
224 
225     QTAILQ_FOREACH(dmabuf, &dpy->dmabuf.bufs, next) {
226         if (dmabuf->dmabuf_id == plane.dmabuf_id) {
227             /* found in list, move to head, return it */
228             QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
229             QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
230             if (plane_type == DRM_PLANE_TYPE_CURSOR) {
231                 vfio_display_update_cursor(dmabuf, &plane);
232             }
233             return dmabuf;
234         }
235     }
236 
237     fd = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_GFX_DMABUF, &plane.dmabuf_id);
238     if (fd < 0) {
239         return NULL;
240     }
241 
242     dmabuf = g_new0(VFIODMABuf, 1);
243     dmabuf->dmabuf_id  = plane.dmabuf_id;
244     dmabuf->buf.width  = plane.width;
245     dmabuf->buf.height = plane.height;
246     dmabuf->buf.stride = plane.stride;
247     dmabuf->buf.fourcc = plane.drm_format;
248     dmabuf->buf.modifier = plane.drm_format_mod;
249     dmabuf->buf.fd     = fd;
250     if (plane_type == DRM_PLANE_TYPE_CURSOR) {
251         vfio_display_update_cursor(dmabuf, &plane);
252     }
253 
254     QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
255     return dmabuf;
256 }
257 
258 static void vfio_display_free_one_dmabuf(VFIODisplay *dpy, VFIODMABuf *dmabuf)
259 {
260     QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
261     dpy_gl_release_dmabuf(dpy->con, &dmabuf->buf);
262     close(dmabuf->buf.fd);
263     g_free(dmabuf);
264 }
265 
266 static void vfio_display_free_dmabufs(VFIOPCIDevice *vdev)
267 {
268     VFIODisplay *dpy = vdev->dpy;
269     VFIODMABuf *dmabuf, *tmp;
270     uint32_t keep = 5;
271 
272     QTAILQ_FOREACH_SAFE(dmabuf, &dpy->dmabuf.bufs, next, tmp) {
273         if (keep > 0) {
274             keep--;
275             continue;
276         }
277         assert(dmabuf != dpy->dmabuf.primary);
278         vfio_display_free_one_dmabuf(dpy, dmabuf);
279     }
280 }
281 
282 static void vfio_display_dmabuf_update(void *opaque)
283 {
284     VFIOPCIDevice *vdev = opaque;
285     VFIODisplay *dpy = vdev->dpy;
286     VFIODMABuf *primary, *cursor;
287     bool free_bufs = false, new_cursor = false;
288 
289     primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
290     if (primary == NULL) {
291         if (dpy->ramfb) {
292             ramfb_display_update(dpy->con, dpy->ramfb);
293         }
294         return;
295     }
296 
297     if (dpy->dmabuf.primary != primary) {
298         dpy->dmabuf.primary = primary;
299         qemu_console_resize(dpy->con,
300                             primary->buf.width, primary->buf.height);
301         dpy_gl_scanout_dmabuf(dpy->con, &primary->buf);
302         free_bufs = true;
303     }
304 
305     cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
306     if (dpy->dmabuf.cursor != cursor) {
307         dpy->dmabuf.cursor = cursor;
308         new_cursor = true;
309         free_bufs = true;
310     }
311 
312     if (cursor && (new_cursor || cursor->hot_updates)) {
313         bool have_hot = (cursor->hot_x != 0xffffffff &&
314                          cursor->hot_y != 0xffffffff);
315         dpy_gl_cursor_dmabuf(dpy->con, &cursor->buf, have_hot,
316                              cursor->hot_x, cursor->hot_y);
317         cursor->hot_updates = 0;
318     } else if (!cursor && new_cursor) {
319         dpy_gl_cursor_dmabuf(dpy->con, NULL, false, 0, 0);
320     }
321 
322     if (cursor && cursor->pos_updates) {
323         dpy_gl_cursor_position(dpy->con,
324                                cursor->pos_x,
325                                cursor->pos_y);
326         cursor->pos_updates = 0;
327     }
328 
329     dpy_gl_update(dpy->con, 0, 0, primary->buf.width, primary->buf.height);
330 
331     if (free_bufs) {
332         vfio_display_free_dmabufs(vdev);
333     }
334 }
335 
336 static int vfio_display_get_flags(void *opaque)
337 {
338     return GRAPHIC_FLAGS_GL | GRAPHIC_FLAGS_DMABUF;
339 }
340 
341 static const GraphicHwOps vfio_display_dmabuf_ops = {
342     .get_flags  = vfio_display_get_flags,
343     .gfx_update = vfio_display_dmabuf_update,
344     .ui_info    = vfio_display_edid_ui_info,
345 };
346 
347 static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
348 {
349     if (!display_opengl) {
350         error_setg(errp, "vfio-display-dmabuf: opengl not available");
351         return -1;
352     }
353 
354     vdev->dpy = g_new0(VFIODisplay, 1);
355     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
356                                           &vfio_display_dmabuf_ops,
357                                           vdev);
358     if (vdev->enable_ramfb) {
359         vdev->dpy->ramfb = ramfb_setup(errp);
360     }
361     vfio_display_edid_init(vdev);
362     return 0;
363 }
364 
365 static void vfio_display_dmabuf_exit(VFIODisplay *dpy)
366 {
367     VFIODMABuf *dmabuf;
368 
369     if (QTAILQ_EMPTY(&dpy->dmabuf.bufs)) {
370         return;
371     }
372 
373     while ((dmabuf = QTAILQ_FIRST(&dpy->dmabuf.bufs)) != NULL) {
374         vfio_display_free_one_dmabuf(dpy, dmabuf);
375     }
376 }
377 
378 /* ---------------------------------------------------------------------- */
379 void vfio_display_reset(VFIOPCIDevice *vdev)
380 {
381     if (!vdev || !vdev->dpy || !vdev->dpy->con ||
382         !vdev->dpy->dmabuf.primary) {
383         return;
384     }
385 
386     dpy_gl_scanout_disable(vdev->dpy->con);
387     vfio_display_dmabuf_exit(vdev->dpy);
388     dpy_gfx_update_full(vdev->dpy->con);
389 }
390 
391 static void vfio_display_region_update(void *opaque)
392 {
393     VFIOPCIDevice *vdev = opaque;
394     VFIODisplay *dpy = vdev->dpy;
395     struct vfio_device_gfx_plane_info plane = {
396         .argsz = sizeof(plane),
397         .flags = VFIO_GFX_PLANE_TYPE_REGION
398     };
399     pixman_format_code_t format;
400     int ret;
401 
402     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
403     if (ret < 0) {
404         error_report("ioctl VFIO_DEVICE_QUERY_GFX_PLANE: %s",
405                      strerror(errno));
406         return;
407     }
408     if (!plane.drm_format || !plane.size) {
409         if (dpy->ramfb) {
410             ramfb_display_update(dpy->con, dpy->ramfb);
411             dpy->region.surface = NULL;
412         }
413         return;
414     }
415     format = qemu_drm_format_to_pixman(plane.drm_format);
416     if (!format) {
417         return;
418     }
419 
420     if (dpy->region.buffer.size &&
421         dpy->region.buffer.nr != plane.region_index) {
422         /* region changed */
423         vfio_region_exit(&dpy->region.buffer);
424         vfio_region_finalize(&dpy->region.buffer);
425         dpy->region.surface = NULL;
426     }
427 
428     if (dpy->region.surface &&
429         (surface_width(dpy->region.surface) != plane.width ||
430          surface_height(dpy->region.surface) != plane.height ||
431          surface_format(dpy->region.surface) != format)) {
432         /* size changed */
433         dpy->region.surface = NULL;
434     }
435 
436     if (!dpy->region.buffer.size) {
437         /* mmap region */
438         ret = vfio_region_setup(OBJECT(vdev), &vdev->vbasedev,
439                                 &dpy->region.buffer,
440                                 plane.region_index,
441                                 "display");
442         if (ret != 0) {
443             error_report("%s: vfio_region_setup(%d): %s",
444                          __func__, plane.region_index, strerror(-ret));
445             goto err;
446         }
447         ret = vfio_region_mmap(&dpy->region.buffer);
448         if (ret != 0) {
449             error_report("%s: vfio_region_mmap(%d): %s", __func__,
450                          plane.region_index, strerror(-ret));
451             goto err;
452         }
453         assert(dpy->region.buffer.mmaps[0].mmap != NULL);
454     }
455 
456     if (dpy->region.surface == NULL) {
457         /* create surface */
458         dpy->region.surface = qemu_create_displaysurface_from
459             (plane.width, plane.height, format,
460              plane.stride, dpy->region.buffer.mmaps[0].mmap);
461         dpy_gfx_replace_surface(dpy->con, dpy->region.surface);
462     }
463 
464     /* full screen update */
465     dpy_gfx_update(dpy->con, 0, 0,
466                    surface_width(dpy->region.surface),
467                    surface_height(dpy->region.surface));
468     return;
469 
470 err:
471     vfio_region_exit(&dpy->region.buffer);
472     vfio_region_finalize(&dpy->region.buffer);
473 }
474 
475 static const GraphicHwOps vfio_display_region_ops = {
476     .gfx_update = vfio_display_region_update,
477 };
478 
479 static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
480 {
481     vdev->dpy = g_new0(VFIODisplay, 1);
482     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
483                                           &vfio_display_region_ops,
484                                           vdev);
485     if (vdev->enable_ramfb) {
486         vdev->dpy->ramfb = ramfb_setup(errp);
487     }
488     return 0;
489 }
490 
491 static void vfio_display_region_exit(VFIODisplay *dpy)
492 {
493     if (!dpy->region.buffer.size) {
494         return;
495     }
496 
497     vfio_region_exit(&dpy->region.buffer);
498     vfio_region_finalize(&dpy->region.buffer);
499 }
500 
501 /* ---------------------------------------------------------------------- */
502 
503 int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
504 {
505     struct vfio_device_gfx_plane_info probe;
506     int ret;
507 
508     memset(&probe, 0, sizeof(probe));
509     probe.argsz = sizeof(probe);
510     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
511     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
512     if (ret == 0) {
513         return vfio_display_dmabuf_init(vdev, errp);
514     }
515 
516     memset(&probe, 0, sizeof(probe));
517     probe.argsz = sizeof(probe);
518     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
519     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
520     if (ret == 0) {
521         return vfio_display_region_init(vdev, errp);
522     }
523 
524     if (vdev->display == ON_OFF_AUTO_AUTO) {
525         /* not an error in automatic mode */
526         return 0;
527     }
528 
529     error_setg(errp, "vfio: device doesn't support any (known) display method");
530     return -1;
531 }
532 
533 void vfio_display_finalize(VFIOPCIDevice *vdev)
534 {
535     if (!vdev->dpy) {
536         return;
537     }
538 
539     graphic_console_close(vdev->dpy->con);
540     vfio_display_dmabuf_exit(vdev->dpy);
541     vfio_display_region_exit(vdev->dpy);
542     vfio_display_edid_exit(vdev->dpy);
543     g_free(vdev->dpy);
544 }
545