xref: /qemu/hw/vfio/display.c (revision 22e3284f) 
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 "sysemu/sysemu.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 int 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 0;
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     return 0;
127 }
128 
129 static void vfio_display_edid_init(VFIOPCIDevice *vdev)
130 {
131     VFIODisplay *dpy = vdev->dpy;
132     int fd = vdev->vbasedev.fd;
133     int ret;
134 
135     ret = vfio_get_dev_region_info(&vdev->vbasedev,
136                                    VFIO_REGION_TYPE_GFX,
137                                    VFIO_REGION_SUBTYPE_GFX_EDID,
138                                    &dpy->edid_info);
139     if (ret) {
140         return;
141     }
142 
143     trace_vfio_display_edid_available();
144     dpy->edid_regs = g_new0(struct vfio_region_gfx_edid, 1);
145     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_offset)) {
146         goto err;
147     }
148     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_max_size)) {
149         goto err;
150     }
151     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_xres)) {
152         goto err;
153     }
154     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_yres)) {
155         goto err;
156     }
157 
158     dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
159 
160     /* if xres + yres properties are unset use the maximum resolution */
161     if (!vdev->display_xres) {
162         vdev->display_xres = dpy->edid_regs->max_xres;
163     }
164     if (!vdev->display_yres) {
165         vdev->display_yres = dpy->edid_regs->max_yres;
166     }
167 
168     dpy->edid_link_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
169                                         vfio_display_edid_link_up, vdev);
170 
171     vfio_display_edid_update(vdev, true, 0, 0);
172     return;
173 
174 err:
175     trace_vfio_display_edid_write_error();
176     g_free(dpy->edid_regs);
177     dpy->edid_regs = NULL;
178     return;
179 }
180 
181 static void vfio_display_edid_exit(VFIODisplay *dpy)
182 {
183     if (!dpy->edid_regs) {
184         return;
185     }
186 
187     g_free(dpy->edid_regs);
188     g_free(dpy->edid_blob);
189     timer_del(dpy->edid_link_timer);
190     timer_free(dpy->edid_link_timer);
191 }
192 
193 static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
194                                        struct vfio_device_gfx_plane_info *plane)
195 {
196     if (dmabuf->pos_x != plane->x_pos || dmabuf->pos_y != plane->y_pos) {
197         dmabuf->pos_x      = plane->x_pos;
198         dmabuf->pos_y      = plane->y_pos;
199         dmabuf->pos_updates++;
200     }
201     if (dmabuf->hot_x != plane->x_hot || dmabuf->hot_y != plane->y_hot) {
202         dmabuf->hot_x      = plane->x_hot;
203         dmabuf->hot_y      = plane->y_hot;
204         dmabuf->hot_updates++;
205     }
206 }
207 
208 static VFIODMABuf *vfio_display_get_dmabuf(VFIOPCIDevice *vdev,
209                                            uint32_t plane_type)
210 {
211     VFIODisplay *dpy = vdev->dpy;
212     struct vfio_device_gfx_plane_info plane;
213     VFIODMABuf *dmabuf;
214     int fd, ret;
215 
216     memset(&plane, 0, sizeof(plane));
217     plane.argsz = sizeof(plane);
218     plane.flags = VFIO_GFX_PLANE_TYPE_DMABUF;
219     plane.drm_plane_type = plane_type;
220     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
221     if (ret < 0) {
222         return NULL;
223     }
224     if (!plane.drm_format || !plane.size) {
225         return NULL;
226     }
227 
228     QTAILQ_FOREACH(dmabuf, &dpy->dmabuf.bufs, next) {
229         if (dmabuf->dmabuf_id == plane.dmabuf_id) {
230             /* found in list, move to head, return it */
231             QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
232             QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
233             if (plane_type == DRM_PLANE_TYPE_CURSOR) {
234                 vfio_display_update_cursor(dmabuf, &plane);
235             }
236             return dmabuf;
237         }
238     }
239 
240     fd = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_GFX_DMABUF, &plane.dmabuf_id);
241     if (fd < 0) {
242         return NULL;
243     }
244 
245     dmabuf = g_new0(VFIODMABuf, 1);
246     dmabuf->dmabuf_id  = plane.dmabuf_id;
247     dmabuf->buf.width  = plane.width;
248     dmabuf->buf.height = plane.height;
249     dmabuf->buf.stride = plane.stride;
250     dmabuf->buf.fourcc = plane.drm_format;
251     dmabuf->buf.fd     = fd;
252     if (plane_type == DRM_PLANE_TYPE_CURSOR) {
253         vfio_display_update_cursor(dmabuf, &plane);
254     }
255 
256     QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
257     return dmabuf;
258 }
259 
260 static void vfio_display_free_one_dmabuf(VFIODisplay *dpy, VFIODMABuf *dmabuf)
261 {
262     QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
263     dpy_gl_release_dmabuf(dpy->con, &dmabuf->buf);
264     close(dmabuf->buf.fd);
265     g_free(dmabuf);
266 }
267 
268 static void vfio_display_free_dmabufs(VFIOPCIDevice *vdev)
269 {
270     VFIODisplay *dpy = vdev->dpy;
271     VFIODMABuf *dmabuf, *tmp;
272     uint32_t keep = 5;
273 
274     QTAILQ_FOREACH_SAFE(dmabuf, &dpy->dmabuf.bufs, next, tmp) {
275         if (keep > 0) {
276             keep--;
277             continue;
278         }
279         assert(dmabuf != dpy->dmabuf.primary);
280         vfio_display_free_one_dmabuf(dpy, dmabuf);
281     }
282 }
283 
284 static void vfio_display_dmabuf_update(void *opaque)
285 {
286     VFIOPCIDevice *vdev = opaque;
287     VFIODisplay *dpy = vdev->dpy;
288     VFIODMABuf *primary, *cursor;
289     bool free_bufs = false, new_cursor = false;;
290 
291     primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
292     if (primary == NULL) {
293         if (dpy->ramfb) {
294             ramfb_display_update(dpy->con, dpy->ramfb);
295         }
296         return;
297     }
298 
299     if (dpy->dmabuf.primary != primary) {
300         dpy->dmabuf.primary = primary;
301         qemu_console_resize(dpy->con,
302                             primary->buf.width, primary->buf.height);
303         dpy_gl_scanout_dmabuf(dpy->con, &primary->buf);
304         free_bufs = true;
305     }
306 
307     cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
308     if (dpy->dmabuf.cursor != cursor) {
309         dpy->dmabuf.cursor = cursor;
310         new_cursor = true;
311         free_bufs = true;
312     }
313 
314     if (cursor && (new_cursor || cursor->hot_updates)) {
315         bool have_hot = (cursor->hot_x != 0xffffffff &&
316                          cursor->hot_y != 0xffffffff);
317         dpy_gl_cursor_dmabuf(dpy->con, &cursor->buf, have_hot,
318                              cursor->hot_x, cursor->hot_y);
319         cursor->hot_updates = 0;
320     } else if (!cursor && new_cursor) {
321         dpy_gl_cursor_dmabuf(dpy->con, NULL, false, 0, 0);
322     }
323 
324     if (cursor && cursor->pos_updates) {
325         dpy_gl_cursor_position(dpy->con,
326                                cursor->pos_x,
327                                cursor->pos_y);
328         cursor->pos_updates = 0;
329     }
330 
331     dpy_gl_update(dpy->con, 0, 0, primary->buf.width, primary->buf.height);
332 
333     if (free_bufs) {
334         vfio_display_free_dmabufs(vdev);
335     }
336 }
337 
338 static const GraphicHwOps vfio_display_dmabuf_ops = {
339     .gfx_update = vfio_display_dmabuf_update,
340     .ui_info    = vfio_display_edid_ui_info,
341 };
342 
343 static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
344 {
345     if (!display_opengl) {
346         error_setg(errp, "vfio-display-dmabuf: opengl not available");
347         return -1;
348     }
349 
350     vdev->dpy = g_new0(VFIODisplay, 1);
351     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
352                                           &vfio_display_dmabuf_ops,
353                                           vdev);
354     if (vdev->enable_ramfb) {
355         vdev->dpy->ramfb = ramfb_setup(errp);
356     }
357     vfio_display_edid_init(vdev);
358     return 0;
359 }
360 
361 static void vfio_display_dmabuf_exit(VFIODisplay *dpy)
362 {
363     VFIODMABuf *dmabuf;
364 
365     if (QTAILQ_EMPTY(&dpy->dmabuf.bufs)) {
366         return;
367     }
368 
369     while ((dmabuf = QTAILQ_FIRST(&dpy->dmabuf.bufs)) != NULL) {
370         vfio_display_free_one_dmabuf(dpy, dmabuf);
371     }
372 }
373 
374 /* ---------------------------------------------------------------------- */
375 void vfio_display_reset(VFIOPCIDevice *vdev)
376 {
377     if (!vdev || !vdev->dpy || !vdev->dpy->con ||
378         !vdev->dpy->dmabuf.primary) {
379         return;
380     }
381 
382     dpy_gl_scanout_disable(vdev->dpy->con);
383     vfio_display_dmabuf_exit(vdev->dpy);
384     dpy_gfx_update_full(vdev->dpy->con);
385 }
386 
387 static void vfio_display_region_update(void *opaque)
388 {
389     VFIOPCIDevice *vdev = opaque;
390     VFIODisplay *dpy = vdev->dpy;
391     struct vfio_device_gfx_plane_info plane = {
392         .argsz = sizeof(plane),
393         .flags = VFIO_GFX_PLANE_TYPE_REGION
394     };
395     pixman_format_code_t format;
396     int ret;
397 
398     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
399     if (ret < 0) {
400         error_report("ioctl VFIO_DEVICE_QUERY_GFX_PLANE: %s",
401                      strerror(errno));
402         return;
403     }
404     if (!plane.drm_format || !plane.size) {
405         if (dpy->ramfb) {
406             ramfb_display_update(dpy->con, dpy->ramfb);
407         }
408         return;
409     }
410     format = qemu_drm_format_to_pixman(plane.drm_format);
411     if (!format) {
412         return;
413     }
414 
415     if (dpy->region.buffer.size &&
416         dpy->region.buffer.nr != plane.region_index) {
417         /* region changed */
418         vfio_region_exit(&dpy->region.buffer);
419         vfio_region_finalize(&dpy->region.buffer);
420         dpy->region.surface = NULL;
421     }
422 
423     if (dpy->region.surface &&
424         (surface_width(dpy->region.surface) != plane.width ||
425          surface_height(dpy->region.surface) != plane.height ||
426          surface_format(dpy->region.surface) != format)) {
427         /* size changed */
428         dpy->region.surface = NULL;
429     }
430 
431     if (!dpy->region.buffer.size) {
432         /* mmap region */
433         ret = vfio_region_setup(OBJECT(vdev), &vdev->vbasedev,
434                                 &dpy->region.buffer,
435                                 plane.region_index,
436                                 "display");
437         if (ret != 0) {
438             error_report("%s: vfio_region_setup(%d): %s",
439                          __func__, plane.region_index, strerror(-ret));
440             goto err;
441         }
442         ret = vfio_region_mmap(&dpy->region.buffer);
443         if (ret != 0) {
444             error_report("%s: vfio_region_mmap(%d): %s", __func__,
445                          plane.region_index, strerror(-ret));
446             goto err;
447         }
448         assert(dpy->region.buffer.mmaps[0].mmap != NULL);
449     }
450 
451     if (dpy->region.surface == NULL) {
452         /* create surface */
453         dpy->region.surface = qemu_create_displaysurface_from
454             (plane.width, plane.height, format,
455              plane.stride, dpy->region.buffer.mmaps[0].mmap);
456         dpy_gfx_replace_surface(dpy->con, dpy->region.surface);
457     }
458 
459     /* full screen update */
460     dpy_gfx_update(dpy->con, 0, 0,
461                    surface_width(dpy->region.surface),
462                    surface_height(dpy->region.surface));
463     return;
464 
465 err:
466     vfio_region_exit(&dpy->region.buffer);
467     vfio_region_finalize(&dpy->region.buffer);
468 }
469 
470 static const GraphicHwOps vfio_display_region_ops = {
471     .gfx_update = vfio_display_region_update,
472 };
473 
474 static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
475 {
476     vdev->dpy = g_new0(VFIODisplay, 1);
477     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
478                                           &vfio_display_region_ops,
479                                           vdev);
480     if (vdev->enable_ramfb) {
481         vdev->dpy->ramfb = ramfb_setup(errp);
482     }
483     return 0;
484 }
485 
486 static void vfio_display_region_exit(VFIODisplay *dpy)
487 {
488     if (!dpy->region.buffer.size) {
489         return;
490     }
491 
492     vfio_region_exit(&dpy->region.buffer);
493     vfio_region_finalize(&dpy->region.buffer);
494 }
495 
496 /* ---------------------------------------------------------------------- */
497 
498 int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
499 {
500     struct vfio_device_gfx_plane_info probe;
501     int ret;
502 
503     memset(&probe, 0, sizeof(probe));
504     probe.argsz = sizeof(probe);
505     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
506     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
507     if (ret == 0) {
508         return vfio_display_dmabuf_init(vdev, errp);
509     }
510 
511     memset(&probe, 0, sizeof(probe));
512     probe.argsz = sizeof(probe);
513     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
514     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
515     if (ret == 0) {
516         return vfio_display_region_init(vdev, errp);
517     }
518 
519     if (vdev->display == ON_OFF_AUTO_AUTO) {
520         /* not an error in automatic mode */
521         return 0;
522     }
523 
524     error_setg(errp, "vfio: device doesn't support any (known) display method");
525     return -1;
526 }
527 
528 void vfio_display_finalize(VFIOPCIDevice *vdev)
529 {
530     if (!vdev->dpy) {
531         return;
532     }
533 
534     graphic_console_close(vdev->dpy->con);
535     vfio_display_dmabuf_exit(vdev->dpy);
536     vfio_display_region_exit(vdev->dpy);
537     vfio_display_edid_exit(vdev->dpy);
538     g_free(vdev->dpy);
539 }
540