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qcow2: manually add more coroutine_fn annotations
[qemu.git] / hw / display / xenfb.c
blob50857cd97a0b4c087d4fd3b601018dd1b4ce31bb
1 /*
2 * xen paravirt framebuffer backend
3 *
4 * Copyright IBM, Corp. 2005-2006
5 * Copyright Red Hat, Inc. 2006-2008
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>,
9 * Markus Armbruster <armbru@redhat.com>,
10 * Daniel P. Berrange <berrange@redhat.com>,
11 * Pat Campbell <plc@novell.com>,
12 * Gerd Hoffmann <kraxel@redhat.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; under version 2 of the License.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, see <http://www.gnu.org/licenses/>.
25 */
26
27 #include "qemu/osdep.h"
28 #include "qemu/units.h"
29
30 #include "ui/input.h"
31 #include "ui/console.h"
32 #include "hw/xen/xen-legacy-backend.h"
33
34 #include "hw/xen/interface/io/fbif.h"
35 #include "hw/xen/interface/io/kbdif.h"
36 #include "hw/xen/interface/io/protocols.h"
37
38 #include "trace.h"
39
40 #ifndef BTN_LEFT
41 #define BTN_LEFT 0x110 /* from <linux/input.h> */
42 #endif
43
44 /* -------------------------------------------------------------------- */
45
46 struct common {
47 struct XenLegacyDevice xendev; /* must be first */
48 void *page;
49 };
50
51 struct XenInput {
52 struct common c;
53 int abs_pointer_wanted; /* Whether guest supports absolute pointer */
54 int raw_pointer_wanted; /* Whether guest supports raw (unscaled) pointer */
55 QemuInputHandlerState *qkbd;
56 QemuInputHandlerState *qmou;
57 int axis[INPUT_AXIS__MAX];
58 int wheel;
59 };
60
61 #define UP_QUEUE 8
62
63 struct XenFB {
64 struct common c;
65 QemuConsole *con;
66 size_t fb_len;
67 int row_stride;
68 int depth;
69 int width;
70 int height;
71 int offset;
72 void *pixels;
73 int fbpages;
74 int feature_update;
75 int bug_trigger;
76 int do_resize;
77
78 struct {
79 int x,y,w,h;
80 } up_rects[UP_QUEUE];
81 int up_count;
82 int up_fullscreen;
83 };
84 static const GraphicHwOps xenfb_ops;
85
86 /* -------------------------------------------------------------------- */
87
88 static int common_bind(struct common *c)
89 {
90 uint64_t val;
91 xen_pfn_t mfn;
92
93 if (xenstore_read_fe_uint64(&c->xendev, "page-ref", &val) == -1)
94 return -1;
95 mfn = (xen_pfn_t)val;
96 assert(val == mfn);
97
98 if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1)
99 return -1;
100
101 c->page = xenforeignmemory_map(xen_fmem, c->xendev.dom,
102 PROT_READ | PROT_WRITE, 1, &mfn, NULL);
103 if (c->page == NULL)
104 return -1;
105
106 xen_be_bind_evtchn(&c->xendev);
107 xen_pv_printf(&c->xendev, 1,
108 "ring mfn %"PRI_xen_pfn", remote-port %d, local-port %d\n",
109 mfn, c->xendev.remote_port, c->xendev.local_port);
110
111 return 0;
112 }
113
114 static void common_unbind(struct common *c)
115 {
116 xen_pv_unbind_evtchn(&c->xendev);
117 if (c->page) {
118 xenforeignmemory_unmap(xen_fmem, c->page, 1);
119 c->page = NULL;
120 }
121 }
122
123 /* -------------------------------------------------------------------- */
124 /* Send an event to the keyboard frontend driver */
125 static int xenfb_kbd_event(struct XenInput *xenfb,
126 union xenkbd_in_event *event)
127 {
128 struct xenkbd_page *page = xenfb->c.page;
129 uint32_t prod;
130
131 if (xenfb->c.xendev.be_state != XenbusStateConnected)
132 return 0;
133 if (!page)
134 return 0;
135
136 prod = page->in_prod;
137 if (prod - page->in_cons == XENKBD_IN_RING_LEN) {
138 errno = EAGAIN;
139 return -1;
140 }
141
142 xen_mb(); /* ensure ring space available */
143 XENKBD_IN_RING_REF(page, prod) = *event;
144 xen_wmb(); /* ensure ring contents visible */
145 page->in_prod = prod + 1;
146 return xen_pv_send_notify(&xenfb->c.xendev);
147 }
148
149 /* Send a keyboard (or mouse button) event */
150 static int xenfb_send_key(struct XenInput *xenfb, bool down, int keycode)
151 {
152 union xenkbd_in_event event;
153
154 memset(&event, 0, XENKBD_IN_EVENT_SIZE);
155 event.type = XENKBD_TYPE_KEY;
156 event.key.pressed = down ? 1 : 0;
157 event.key.keycode = keycode;
158
159 return xenfb_kbd_event(xenfb, &event);
160 }
161
162 /* Send a relative mouse movement event */
163 static int xenfb_send_motion(struct XenInput *xenfb,
164 int rel_x, int rel_y, int rel_z)
165 {
166 union xenkbd_in_event event;
167
168 memset(&event, 0, XENKBD_IN_EVENT_SIZE);
169 event.type = XENKBD_TYPE_MOTION;
170 event.motion.rel_x = rel_x;
171 event.motion.rel_y = rel_y;
172 event.motion.rel_z = rel_z;
173
174 return xenfb_kbd_event(xenfb, &event);
175 }
176
177 /* Send an absolute mouse movement event */
178 static int xenfb_send_position(struct XenInput *xenfb,
179 int abs_x, int abs_y, int z)
180 {
181 union xenkbd_in_event event;
182
183 memset(&event, 0, XENKBD_IN_EVENT_SIZE);
184 event.type = XENKBD_TYPE_POS;
185 event.pos.abs_x = abs_x;
186 event.pos.abs_y = abs_y;
187 event.pos.rel_z = z;
188
189 return xenfb_kbd_event(xenfb, &event);
190 }
191
192 /*
193 * Send a key event from the client to the guest OS
194 * QEMU gives us a QCode.
195 * We have to turn this into a Linux Input layer keycode.
196 *
197 * Wish we could just send scancodes straight to the guest which
198 * already has code for dealing with this...
199 */
200 static void xenfb_key_event(DeviceState *dev, QemuConsole *src,
201 InputEvent *evt)
202 {
203 struct XenInput *xenfb = (struct XenInput *)dev;
204 InputKeyEvent *key = evt->u.key.data;
205 int qcode = qemu_input_key_value_to_qcode(key->key);
206 int lnx;
207
208 if (qcode < qemu_input_map_qcode_to_linux_len) {
209 lnx = qemu_input_map_qcode_to_linux[qcode];
210
211 if (lnx) {
212 trace_xenfb_key_event(xenfb, lnx, key->down);
213 xenfb_send_key(xenfb, key->down, lnx);
214 }
215 }
216 }
217
218 /*
219 * Send a mouse event from the client to the guest OS
220 *
221 * The QEMU mouse can be in either relative, or absolute mode.
222 * Movement is sent separately from button state, which has to
223 * be encoded as virtual key events. We also don't actually get
224 * given any button up/down events, so have to track changes in
225 * the button state.
226 */
227 static void xenfb_mouse_event(DeviceState *dev, QemuConsole *src,
228 InputEvent *evt)
229 {
230 struct XenInput *xenfb = (struct XenInput *)dev;
231 InputBtnEvent *btn;
232 InputMoveEvent *move;
233 QemuConsole *con;
234 DisplaySurface *surface;
235 int scale;
236
237 switch (evt->type) {
238 case INPUT_EVENT_KIND_BTN:
239 btn = evt->u.btn.data;
240 switch (btn->button) {
241 case INPUT_BUTTON_LEFT:
242 xenfb_send_key(xenfb, btn->down, BTN_LEFT);
243 break;
244 case INPUT_BUTTON_RIGHT:
245 xenfb_send_key(xenfb, btn->down, BTN_LEFT + 1);
246 break;
247 case INPUT_BUTTON_MIDDLE:
248 xenfb_send_key(xenfb, btn->down, BTN_LEFT + 2);
249 break;
250 case INPUT_BUTTON_WHEEL_UP:
251 if (btn->down) {
252 xenfb->wheel--;
253 }
254 break;
255 case INPUT_BUTTON_WHEEL_DOWN:
256 if (btn->down) {
257 xenfb->wheel++;
258 }
259 break;
260 default:
261 break;
262 }
263 break;
264
265 case INPUT_EVENT_KIND_ABS:
266 move = evt->u.abs.data;
267 if (xenfb->raw_pointer_wanted) {
268 xenfb->axis[move->axis] = move->value;
269 } else {
270 con = qemu_console_lookup_by_index(0);
271 if (!con) {
272 xen_pv_printf(&xenfb->c.xendev, 0, "No QEMU console available");
273 return;
274 }
275 surface = qemu_console_surface(con);
276 switch (move->axis) {
277 case INPUT_AXIS_X:
278 scale = surface_width(surface) - 1;
279 break;
280 case INPUT_AXIS_Y:
281 scale = surface_height(surface) - 1;
282 break;
283 default:
284 scale = 0x8000;
285 break;
286 }
287 xenfb->axis[move->axis] = move->value * scale / 0x7fff;
288 }
289 break;
290
291 case INPUT_EVENT_KIND_REL:
292 move = evt->u.rel.data;
293 xenfb->axis[move->axis] += move->value;
294 break;
295
296 default:
297 break;
298 }
299 }
300
301 static void xenfb_mouse_sync(DeviceState *dev)
302 {
303 struct XenInput *xenfb = (struct XenInput *)dev;
304
305 trace_xenfb_mouse_event(xenfb, xenfb->axis[INPUT_AXIS_X],
306 xenfb->axis[INPUT_AXIS_Y],
307 xenfb->wheel, 0,
308 xenfb->abs_pointer_wanted);
309 if (xenfb->abs_pointer_wanted) {
310 xenfb_send_position(xenfb, xenfb->axis[INPUT_AXIS_X],
311 xenfb->axis[INPUT_AXIS_Y],
312 xenfb->wheel);
313 } else {
314 xenfb_send_motion(xenfb, xenfb->axis[INPUT_AXIS_X],
315 xenfb->axis[INPUT_AXIS_Y],
316 xenfb->wheel);
317 xenfb->axis[INPUT_AXIS_X] = 0;
318 xenfb->axis[INPUT_AXIS_Y] = 0;
319 }
320 xenfb->wheel = 0;
321 }
322
323 static QemuInputHandler xenfb_keyboard = {
324 .name = "Xen PV Keyboard",
325 .mask = INPUT_EVENT_MASK_KEY,
326 .event = xenfb_key_event,
327 };
328
329 static QemuInputHandler xenfb_abs_mouse = {
330 .name = "Xen PV Mouse",
331 .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
332 .event = xenfb_mouse_event,
333 .sync = xenfb_mouse_sync,
334 };
335
336 static QemuInputHandler xenfb_rel_mouse = {
337 .name = "Xen PV Mouse",
338 .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
339 .event = xenfb_mouse_event,
340 .sync = xenfb_mouse_sync,
341 };
342
343 static int input_init(struct XenLegacyDevice *xendev)
344 {
345 xenstore_write_be_int(xendev, "feature-abs-pointer", 1);
346 xenstore_write_be_int(xendev, "feature-raw-pointer", 1);
347 return 0;
348 }
349
350 static int input_initialise(struct XenLegacyDevice *xendev)
351 {
352 struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
353 int rc;
354
355 rc = common_bind(&in->c);
356 if (rc != 0)
357 return rc;
358
359 return 0;
360 }
361
362 static void input_connected(struct XenLegacyDevice *xendev)
363 {
364 struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
365
366 if (xenstore_read_fe_int(xendev, "request-abs-pointer",
367 &in->abs_pointer_wanted) == -1) {
368 in->abs_pointer_wanted = 0;
369 }
370 if (xenstore_read_fe_int(xendev, "request-raw-pointer",
371 &in->raw_pointer_wanted) == -1) {
372 in->raw_pointer_wanted = 0;
373 }
374 if (in->raw_pointer_wanted && in->abs_pointer_wanted == 0) {
375 xen_pv_printf(xendev, 0, "raw pointer set without abs pointer");
376 }
377
378 if (in->qkbd) {
379 qemu_input_handler_unregister(in->qkbd);
380 }
381 if (in->qmou) {
382 qemu_input_handler_unregister(in->qmou);
383 }
384 trace_xenfb_input_connected(xendev, in->abs_pointer_wanted);
385
386 in->qkbd = qemu_input_handler_register((DeviceState *)in, &xenfb_keyboard);
387 in->qmou = qemu_input_handler_register((DeviceState *)in,
388 in->abs_pointer_wanted ? &xenfb_abs_mouse : &xenfb_rel_mouse);
389
390 if (in->raw_pointer_wanted) {
391 qemu_input_handler_activate(in->qkbd);
392 qemu_input_handler_activate(in->qmou);
393 }
394 }
395
396 static void input_disconnect(struct XenLegacyDevice *xendev)
397 {
398 struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
399
400 if (in->qkbd) {
401 qemu_input_handler_unregister(in->qkbd);
402 in->qkbd = NULL;
403 }
404 if (in->qmou) {
405 qemu_input_handler_unregister(in->qmou);
406 in->qmou = NULL;
407 }
408 common_unbind(&in->c);
409 }
410
411 static void input_event(struct XenLegacyDevice *xendev)
412 {
413 struct XenInput *xenfb = container_of(xendev, struct XenInput, c.xendev);
414 struct xenkbd_page *page = xenfb->c.page;
415
416 /* We don't understand any keyboard events, so just ignore them. */
417 if (page->out_prod == page->out_cons)
418 return;
419 page->out_cons = page->out_prod;
420 xen_pv_send_notify(&xenfb->c.xendev);
421 }
422
423 /* -------------------------------------------------------------------- */
424
425 static void xenfb_copy_mfns(int mode, int count, xen_pfn_t *dst, void *src)
426 {
427 uint32_t *src32 = src;
428 uint64_t *src64 = src;
429 int i;
430
431 for (i = 0; i < count; i++)
432 dst[i] = (mode == 32) ? src32[i] : src64[i];
433 }
434
435 static int xenfb_map_fb(struct XenFB *xenfb)
436 {
437 struct xenfb_page *page = xenfb->c.page;
438 char *protocol = xenfb->c.xendev.protocol;
439 int n_fbdirs;
440 xen_pfn_t *pgmfns = NULL;
441 xen_pfn_t *fbmfns = NULL;
442 void *map, *pd;
443 int mode, ret = -1;
444
445 /* default to native */
446 pd = page->pd;
447 mode = sizeof(unsigned long) * 8;
448
449 if (!protocol) {
450 /*
451 * Undefined protocol, some guesswork needed.
452 *
453 * Old frontends which don't set the protocol use
454 * one page directory only, thus pd[1] must be zero.
455 * pd[1] of the 32bit struct layout and the lower
456 * 32 bits of pd[0] of the 64bit struct layout have
457 * the same location, so we can check that ...
458 */
459 uint32_t *ptr32 = NULL;
460 uint32_t *ptr64 = NULL;
461 #if defined(__i386__)
462 ptr32 = (void*)page->pd;
463 ptr64 = ((void*)page->pd) + 4;
464 #elif defined(__x86_64__)
465 ptr32 = ((void*)page->pd) - 4;
466 ptr64 = (void*)page->pd;
467 #endif
468 if (ptr32) {
469 if (ptr32[1] == 0) {
470 mode = 32;
471 pd = ptr32;
472 } else {
473 mode = 64;
474 pd = ptr64;
475 }
476 }
477 #if defined(__x86_64__)
478 } else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
479 /* 64bit dom0, 32bit domU */
480 mode = 32;
481 pd = ((void*)page->pd) - 4;
482 #elif defined(__i386__)
483 } else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
484 /* 32bit dom0, 64bit domU */
485 mode = 64;
486 pd = ((void*)page->pd) + 4;
487 #endif
488 }
489
490 if (xenfb->pixels) {
491 munmap(xenfb->pixels, xenfb->fbpages * XC_PAGE_SIZE);
492 xenfb->pixels = NULL;
493 }
494
495 xenfb->fbpages = DIV_ROUND_UP(xenfb->fb_len, XC_PAGE_SIZE);
496 n_fbdirs = xenfb->fbpages * mode / 8;
497 n_fbdirs = DIV_ROUND_UP(n_fbdirs, XC_PAGE_SIZE);
498
499 pgmfns = g_new0(xen_pfn_t, n_fbdirs);
500 fbmfns = g_new0(xen_pfn_t, xenfb->fbpages);
501
502 xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
503 map = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
504 PROT_READ, n_fbdirs, pgmfns, NULL);
505 if (map == NULL)
506 goto out;
507 xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
508 xenforeignmemory_unmap(xen_fmem, map, n_fbdirs);
509
510 xenfb->pixels = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
511 PROT_READ, xenfb->fbpages, fbmfns, NULL);
512 if (xenfb->pixels == NULL)
513 goto out;
514
515 ret = 0; /* all is fine */
516
517 out:
518 g_free(pgmfns);
519 g_free(fbmfns);
520 return ret;
521 }
522
523 static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
524 int width, int height, int depth,
525 size_t fb_len, int offset, int row_stride)
526 {
527 size_t mfn_sz = sizeof_field(struct xenfb_page, pd[0]);
528 size_t pd_len = sizeof_field(struct xenfb_page, pd) / mfn_sz;
529 size_t fb_pages = pd_len * XC_PAGE_SIZE / mfn_sz;
530 size_t fb_len_max = fb_pages * XC_PAGE_SIZE;
531 int max_width, max_height;
532
533 if (fb_len_lim > fb_len_max) {
534 xen_pv_printf(&xenfb->c.xendev, 0,
535 "fb size limit %zu exceeds %zu, corrected\n",
536 fb_len_lim, fb_len_max);
537 fb_len_lim = fb_len_max;
538 }
539 if (fb_len_lim && fb_len > fb_len_lim) {
540 xen_pv_printf(&xenfb->c.xendev, 0,
541 "frontend fb size %zu limited to %zu\n",
542 fb_len, fb_len_lim);
543 fb_len = fb_len_lim;
544 }
545 if (depth != 8 && depth != 16 && depth != 24 && depth != 32) {
546 xen_pv_printf(&xenfb->c.xendev, 0,
547 "can't handle frontend fb depth %d\n",
548 depth);
549 return -1;
550 }
551 if (row_stride <= 0 || row_stride > fb_len) {
552 xen_pv_printf(&xenfb->c.xendev, 0, "invalid frontend stride %d\n",
553 row_stride);
554 return -1;
555 }
556 max_width = row_stride / (depth / 8);
557 if (width < 0 || width > max_width) {
558 xen_pv_printf(&xenfb->c.xendev, 0,
559 "invalid frontend width %d limited to %d\n",
560 width, max_width);
561 width = max_width;
562 }
563 if (offset < 0 || offset >= fb_len) {
564 xen_pv_printf(&xenfb->c.xendev, 0,
565 "invalid frontend offset %d (max %zu)\n",
566 offset, fb_len - 1);
567 return -1;
568 }
569 max_height = (fb_len - offset) / row_stride;
570 if (height < 0 || height > max_height) {
571 xen_pv_printf(&xenfb->c.xendev, 0,
572 "invalid frontend height %d limited to %d\n",
573 height, max_height);
574 height = max_height;
575 }
576 xenfb->fb_len = fb_len;
577 xenfb->row_stride = row_stride;
578 xenfb->depth = depth;
579 xenfb->width = width;
580 xenfb->height = height;
581 xenfb->offset = offset;
582 xenfb->up_fullscreen = 1;
583 xenfb->do_resize = 1;
584 xen_pv_printf(&xenfb->c.xendev, 1,
585 "framebuffer %dx%dx%d offset %d stride %d\n",
586 width, height, depth, offset, row_stride);
587 return 0;
588 }
589
590 /* A convenient function for munging pixels between different depths */
591 #define BLT(SRC_T,DST_T,RSB,GSB,BSB,RDB,GDB,BDB) \
592 for (line = y ; line < (y+h) ; line++) { \
593 SRC_T *src = (SRC_T *)(xenfb->pixels \
594 + xenfb->offset \
595 + (line * xenfb->row_stride) \
596 + (x * xenfb->depth / 8)); \
597 DST_T *dst = (DST_T *)(data \
598 + (line * linesize) \
599 + (x * bpp / 8)); \
600 int col; \
601 const int RSS = 32 - (RSB + GSB + BSB); \
602 const int GSS = 32 - (GSB + BSB); \
603 const int BSS = 32 - (BSB); \
604 const uint32_t RSM = (~0U) << (32 - RSB); \
605 const uint32_t GSM = (~0U) << (32 - GSB); \
606 const uint32_t BSM = (~0U) << (32 - BSB); \
607 const int RDS = 32 - (RDB + GDB + BDB); \
608 const int GDS = 32 - (GDB + BDB); \
609 const int BDS = 32 - (BDB); \
610 const uint32_t RDM = (~0U) << (32 - RDB); \
611 const uint32_t GDM = (~0U) << (32 - GDB); \
612 const uint32_t BDM = (~0U) << (32 - BDB); \
613 for (col = x ; col < (x+w) ; col++) { \
614 uint32_t spix = *src; \
615 *dst = (((spix << RSS) & RSM & RDM) >> RDS) | \
616 (((spix << GSS) & GSM & GDM) >> GDS) | \
617 (((spix << BSS) & BSM & BDM) >> BDS); \
618 src = (SRC_T *) ((unsigned long) src + xenfb->depth / 8); \
619 dst = (DST_T *) ((unsigned long) dst + bpp / 8); \
620 } \
621 }
622
623
624 /*
625 * This copies data from the guest framebuffer region, into QEMU's
626 * displaysurface. qemu uses 16 or 32 bpp. In case the pv framebuffer
627 * uses something else we must convert and copy, otherwise we can
628 * supply the buffer directly and no thing here.
629 */
630 static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
631 {
632 DisplaySurface *surface = qemu_console_surface(xenfb->con);
633 int line, oops = 0;
634 int bpp = surface_bits_per_pixel(surface);
635 int linesize = surface_stride(surface);
636 uint8_t *data = surface_data(surface);
637
638 if (!is_buffer_shared(surface)) {
639 switch (xenfb->depth) {
640 case 8:
641 if (bpp == 16) {
642 BLT(uint8_t, uint16_t, 3, 3, 2, 5, 6, 5);
643 } else if (bpp == 32) {
644 BLT(uint8_t, uint32_t, 3, 3, 2, 8, 8, 8);
645 } else {
646 oops = 1;
647 }
648 break;
649 case 24:
650 if (bpp == 16) {
651 BLT(uint32_t, uint16_t, 8, 8, 8, 5, 6, 5);
652 } else if (bpp == 32) {
653 BLT(uint32_t, uint32_t, 8, 8, 8, 8, 8, 8);
654 } else {
655 oops = 1;
656 }
657 break;
658 default:
659 oops = 1;
660 }
661 }
662 if (oops) /* should not happen */
663 xen_pv_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n",
664 __func__, xenfb->depth, bpp);
665
666 dpy_gfx_update(xenfb->con, x, y, w, h);
667 }
668
669 #ifdef XENFB_TYPE_REFRESH_PERIOD
670 static int xenfb_queue_full(struct XenFB *xenfb)
671 {
672 struct xenfb_page *page = xenfb->c.page;
673 uint32_t cons, prod;
674
675 if (!page)
676 return 1;
677
678 prod = page->in_prod;
679 cons = page->in_cons;
680 return prod - cons == XENFB_IN_RING_LEN;
681 }
682
683 static void xenfb_send_event(struct XenFB *xenfb, union xenfb_in_event *event)
684 {
685 uint32_t prod;
686 struct xenfb_page *page = xenfb->c.page;
687
688 prod = page->in_prod;
689 /* caller ensures !xenfb_queue_full() */
690 xen_mb(); /* ensure ring space available */
691 XENFB_IN_RING_REF(page, prod) = *event;
692 xen_wmb(); /* ensure ring contents visible */
693 page->in_prod = prod + 1;
694
695 xen_pv_send_notify(&xenfb->c.xendev);
696 }
697
698 static void xenfb_send_refresh_period(struct XenFB *xenfb, int period)
699 {
700 union xenfb_in_event event;
701
702 memset(&event, 0, sizeof(event));
703 event.type = XENFB_TYPE_REFRESH_PERIOD;
704 event.refresh_period.period = period;
705 xenfb_send_event(xenfb, &event);
706 }
707 #endif
708
709 /*
710 * Periodic update of display.
711 * Also transmit the refresh interval to the frontend.
712 *
713 * Never ever do any qemu display operations
714 * (resize, screen update) outside this function.
715 * Our screen might be inactive. When asked for
716 * an update we know it is active.
717 */
718 static void xenfb_update(void *opaque)
719 {
720 struct XenFB *xenfb = opaque;
721 DisplaySurface *surface;
722 int i;
723
724 if (xenfb->c.xendev.be_state != XenbusStateConnected)
725 return;
726
727 if (!xenfb->feature_update) {
728 /* we don't get update notifications, thus use the
729 * sledge hammer approach ... */
730 xenfb->up_fullscreen = 1;
731 }
732
733 /* resize if needed */
734 if (xenfb->do_resize) {
735 pixman_format_code_t format;
736
737 xenfb->do_resize = 0;
738 switch (xenfb->depth) {
739 case 16:
740 case 32:
741 /* console.c supported depth -> buffer can be used directly */
742 format = qemu_default_pixman_format(xenfb->depth, true);
743 surface = qemu_create_displaysurface_from
744 (xenfb->width, xenfb->height, format,
745 xenfb->row_stride, xenfb->pixels + xenfb->offset);
746 break;
747 default:
748 /* we must convert stuff */
749 surface = qemu_create_displaysurface(xenfb->width, xenfb->height);
750 break;
751 }
752 dpy_gfx_replace_surface(xenfb->con, surface);
753 xen_pv_printf(&xenfb->c.xendev, 1,
754 "update: resizing: %dx%d @ %d bpp%s\n",
755 xenfb->width, xenfb->height, xenfb->depth,
756 is_buffer_shared(surface) ? " (shared)" : "");
757 xenfb->up_fullscreen = 1;
758 }
759
760 /* run queued updates */
761 if (xenfb->up_fullscreen) {
762 xen_pv_printf(&xenfb->c.xendev, 3, "update: fullscreen\n");
763 xenfb_guest_copy(xenfb, 0, 0, xenfb->width, xenfb->height);
764 } else if (xenfb->up_count) {
765 xen_pv_printf(&xenfb->c.xendev, 3, "update: %d rects\n",
766 xenfb->up_count);
767 for (i = 0; i < xenfb->up_count; i++)
768 xenfb_guest_copy(xenfb,
769 xenfb->up_rects[i].x,
770 xenfb->up_rects[i].y,
771 xenfb->up_rects[i].w,
772 xenfb->up_rects[i].h);
773 } else {
774 xen_pv_printf(&xenfb->c.xendev, 3, "update: nothing\n");
775 }
776 xenfb->up_count = 0;
777 xenfb->up_fullscreen = 0;
778 }
779
780 static void xenfb_ui_info(void *opaque, uint32_t idx, QemuUIInfo *info)
781 {
782 struct XenFB *xenfb = opaque;
783 uint32_t refresh_rate;
784
785 if (xenfb->feature_update) {
786 #ifdef XENFB_TYPE_REFRESH_PERIOD
787 if (xenfb_queue_full(xenfb)) {
788 return;
789 }
790
791 refresh_rate = info->refresh_rate;
792 if (!refresh_rate) {
793 refresh_rate = 75;
794 }
795
796 /* T = 1 / f = 1 [s*Hz] / f = 1000*1000 [ms*mHz] / f */
797 xenfb_send_refresh_period(xenfb, 1000 * 1000 / refresh_rate);
798 #endif
799 }
800 }
801
802 /* QEMU display state changed, so refresh the framebuffer copy */
803 static void xenfb_invalidate(void *opaque)
804 {
805 struct XenFB *xenfb = opaque;
806 xenfb->up_fullscreen = 1;
807 }
808
809 static void xenfb_handle_events(struct XenFB *xenfb)
810 {
811 uint32_t prod, cons, out_cons;
812 struct xenfb_page *page = xenfb->c.page;
813
814 prod = page->out_prod;
815 out_cons = page->out_cons;
816 if (prod - out_cons > XENFB_OUT_RING_LEN) {
817 return;
818 }
819 xen_rmb(); /* ensure we see ring contents up to prod */
820 for (cons = out_cons; cons != prod; cons++) {
821 union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);
822 uint8_t type = event->type;
823 int x, y, w, h;
824
825 switch (type) {
826 case XENFB_TYPE_UPDATE:
827 if (xenfb->up_count == UP_QUEUE)
828 xenfb->up_fullscreen = 1;
829 if (xenfb->up_fullscreen)
830 break;
831 x = MAX(event->update.x, 0);
832 y = MAX(event->update.y, 0);
833 w = MIN(event->update.width, xenfb->width - x);
834 h = MIN(event->update.height, xenfb->height - y);
835 if (w < 0 || h < 0) {
836 xen_pv_printf(&xenfb->c.xendev, 1, "bogus update ignored\n");
837 break;
838 }
839 if (x != event->update.x ||
840 y != event->update.y ||
841 w != event->update.width ||
842 h != event->update.height) {
843 xen_pv_printf(&xenfb->c.xendev, 1, "bogus update clipped\n");
844 }
845 if (w == xenfb->width && h > xenfb->height / 2) {
846 /* scroll detector: updated more than 50% of the lines,
847 * don't bother keeping track of the rectangles then */
848 xenfb->up_fullscreen = 1;
849 } else {
850 xenfb->up_rects[xenfb->up_count].x = x;
851 xenfb->up_rects[xenfb->up_count].y = y;
852 xenfb->up_rects[xenfb->up_count].w = w;
853 xenfb->up_rects[xenfb->up_count].h = h;
854 xenfb->up_count++;
855 }
856 break;
857 #ifdef XENFB_TYPE_RESIZE
858 case XENFB_TYPE_RESIZE:
859 if (xenfb_configure_fb(xenfb, xenfb->fb_len,
860 event->resize.width,
861 event->resize.height,
862 event->resize.depth,
863 xenfb->fb_len,
864 event->resize.offset,
865 event->resize.stride) < 0)
866 break;
867 xenfb_invalidate(xenfb);
868 break;
869 #endif
870 }
871 }
872 xen_mb(); /* ensure we're done with ring contents */
873 page->out_cons = cons;
874 }
875
876 static int fb_init(struct XenLegacyDevice *xendev)
877 {
878 #ifdef XENFB_TYPE_RESIZE
879 xenstore_write_be_int(xendev, "feature-resize", 1);
880 #endif
881 return 0;
882 }
883
884 static int fb_initialise(struct XenLegacyDevice *xendev)
885 {
886 struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
887 struct xenfb_page *fb_page;
888 int videoram;
889 int rc;
890
891 if (xenstore_read_fe_int(xendev, "videoram", &videoram) == -1)
892 videoram = 0;
893
894 rc = common_bind(&fb->c);
895 if (rc != 0)
896 return rc;
897
898 fb_page = fb->c.page;
899 rc = xenfb_configure_fb(fb, videoram * MiB,
900 fb_page->width, fb_page->height, fb_page->depth,
901 fb_page->mem_length, 0, fb_page->line_length);
902 if (rc != 0)
903 return rc;
904
905 rc = xenfb_map_fb(fb);
906 if (rc != 0)
907 return rc;
908
909 fb->con = graphic_console_init(NULL, 0, &xenfb_ops, fb);
910
911 if (xenstore_read_fe_int(xendev, "feature-update", &fb->feature_update) == -1)
912 fb->feature_update = 0;
913 if (fb->feature_update)
914 xenstore_write_be_int(xendev, "request-update", 1);
915
916 xen_pv_printf(xendev, 1, "feature-update=%d, videoram=%d\n",
917 fb->feature_update, videoram);
918 return 0;
919 }
920
921 static void fb_disconnect(struct XenLegacyDevice *xendev)
922 {
923 struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
924
925 /*
926 * FIXME: qemu can't un-init gfx display (yet?).
927 * Replacing the framebuffer with anonymous shared memory
928 * instead. This releases the guest pages and keeps qemu happy.
929 */
930 xenforeignmemory_unmap(xen_fmem, fb->pixels, fb->fbpages);
931 fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
932 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
933 -1, 0);
934 if (fb->pixels == MAP_FAILED) {
935 xen_pv_printf(xendev, 0,
936 "Couldn't replace the framebuffer with anonymous memory errno=%d\n",
937 errno);
938 }
939 common_unbind(&fb->c);
940 fb->feature_update = 0;
941 fb->bug_trigger = 0;
942 }
943
944 static void fb_frontend_changed(struct XenLegacyDevice *xendev,
945 const char *node)
946 {
947 struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
948
949 /*
950 * Set state to Connected *again* once the frontend switched
951 * to connected. We must trigger the watch a second time to
952 * workaround a frontend bug.
953 */
954 if (fb->bug_trigger == 0 && strcmp(node, "state") == 0 &&
955 xendev->fe_state == XenbusStateConnected &&
956 xendev->be_state == XenbusStateConnected) {
957 xen_pv_printf(xendev, 2, "re-trigger connected (frontend bug)\n");
958 xen_be_set_state(xendev, XenbusStateConnected);
959 fb->bug_trigger = 1; /* only once */
960 }
961 }
962
963 static void fb_event(struct XenLegacyDevice *xendev)
964 {
965 struct XenFB *xenfb = container_of(xendev, struct XenFB, c.xendev);
966
967 xenfb_handle_events(xenfb);
968 xen_pv_send_notify(&xenfb->c.xendev);
969 }
970
971 /* -------------------------------------------------------------------- */
972
973 struct XenDevOps xen_kbdmouse_ops = {
974 .size = sizeof(struct XenInput),
975 .init = input_init,
976 .initialise = input_initialise,
977 .connected = input_connected,
978 .disconnect = input_disconnect,
979 .event = input_event,
980 };
981
982 struct XenDevOps xen_framebuffer_ops = {
983 .size = sizeof(struct XenFB),
984 .init = fb_init,
985 .initialise = fb_initialise,
986 .disconnect = fb_disconnect,
987 .event = fb_event,
988 .frontend_changed = fb_frontend_changed,
989 };
990
991 static const GraphicHwOps xenfb_ops = {
992 .invalidate = xenfb_invalidate,
993 .gfx_update = xenfb_update,
994 .ui_info = xenfb_ui_info,
995 };
QEmu