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21#include <linux/console.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/fb.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/vmalloc.h>
28#include <linux/mm.h>
29
30#include <asm/xen/hypervisor.h>
31
32#include <xen/xen.h>
33#include <xen/events.h>
34#include <xen/page.h>
35#include <xen/interface/io/fbif.h>
36#include <xen/interface/io/protocols.h>
37#include <xen/xenbus.h>
38#include <xen/platform_pci.h>
39
40struct xenfb_info {
41 unsigned char *fb;
42 struct fb_info *fb_info;
43 int x1, y1, x2, y2;
44
45 spinlock_t dirty_lock;
46 int nr_pages;
47 int irq;
48 struct xenfb_page *page;
49 unsigned long *mfns;
50 int update_wanted;
51 int feature_resize;
52 struct xenfb_resize resize;
53 int resize_dpy;
54 spinlock_t resize_lock;
55
56 struct xenbus_device *xbdev;
57};
58
59#define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8)
60
61enum { KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT };
62static int video[KPARAM_CNT] = { 2, XENFB_WIDTH, XENFB_HEIGHT };
63module_param_array(video, int, NULL, 0);
64MODULE_PARM_DESC(video,
65 "Video memory size in MB, width, height in pixels (default 2,800,600)");
66
67static void xenfb_make_preferred_console(void);
68static int xenfb_remove(struct xenbus_device *);
69static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *);
70static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *);
71static void xenfb_disconnect_backend(struct xenfb_info *);
72
73static void xenfb_send_event(struct xenfb_info *info,
74 union xenfb_out_event *event)
75{
76 u32 prod;
77
78 prod = info->page->out_prod;
79
80 mb();
81 XENFB_OUT_RING_REF(info->page, prod) = *event;
82 wmb();
83 info->page->out_prod = prod + 1;
84
85 notify_remote_via_irq(info->irq);
86}
87
88static void xenfb_do_update(struct xenfb_info *info,
89 int x, int y, int w, int h)
90{
91 union xenfb_out_event event;
92
93 memset(&event, 0, sizeof(event));
94 event.type = XENFB_TYPE_UPDATE;
95 event.update.x = x;
96 event.update.y = y;
97 event.update.width = w;
98 event.update.height = h;
99
100
101 xenfb_send_event(info, &event);
102}
103
104static void xenfb_do_resize(struct xenfb_info *info)
105{
106 union xenfb_out_event event;
107
108 memset(&event, 0, sizeof(event));
109 event.resize = info->resize;
110
111
112 xenfb_send_event(info, &event);
113}
114
115static int xenfb_queue_full(struct xenfb_info *info)
116{
117 u32 cons, prod;
118
119 prod = info->page->out_prod;
120 cons = info->page->out_cons;
121 return prod - cons == XENFB_OUT_RING_LEN;
122}
123
124static void xenfb_handle_resize_dpy(struct xenfb_info *info)
125{
126 unsigned long flags;
127
128 spin_lock_irqsave(&info->resize_lock, flags);
129 if (info->resize_dpy) {
130 if (!xenfb_queue_full(info)) {
131 info->resize_dpy = 0;
132 xenfb_do_resize(info);
133 }
134 }
135 spin_unlock_irqrestore(&info->resize_lock, flags);
136}
137
138static void xenfb_refresh(struct xenfb_info *info,
139 int x1, int y1, int w, int h)
140{
141 unsigned long flags;
142 int x2 = x1 + w - 1;
143 int y2 = y1 + h - 1;
144
145 xenfb_handle_resize_dpy(info);
146
147 if (!info->update_wanted)
148 return;
149
150 spin_lock_irqsave(&info->dirty_lock, flags);
151
152
153 if (info->y1 < y1)
154 y1 = info->y1;
155 if (info->y2 > y2)
156 y2 = info->y2;
157 if (info->x1 < x1)
158 x1 = info->x1;
159 if (info->x2 > x2)
160 x2 = info->x2;
161
162 if (xenfb_queue_full(info)) {
163
164 info->x1 = x1;
165 info->x2 = x2;
166 info->y1 = y1;
167 info->y2 = y2;
168 spin_unlock_irqrestore(&info->dirty_lock, flags);
169 return;
170 }
171
172
173 info->x1 = info->y1 = INT_MAX;
174 info->x2 = info->y2 = 0;
175
176 spin_unlock_irqrestore(&info->dirty_lock, flags);
177
178 if (x1 <= x2 && y1 <= y2)
179 xenfb_do_update(info, x1, y1, x2 - x1 + 1, y2 - y1 + 1);
180}
181
182static void xenfb_deferred_io(struct fb_info *fb_info,
183 struct list_head *pagelist)
184{
185 struct xenfb_info *info = fb_info->par;
186 struct page *page;
187 unsigned long beg, end;
188 int y1, y2, miny, maxy;
189
190 miny = INT_MAX;
191 maxy = 0;
192 list_for_each_entry(page, pagelist, lru) {
193 beg = page->index << PAGE_SHIFT;
194 end = beg + PAGE_SIZE - 1;
195 y1 = beg / fb_info->fix.line_length;
196 y2 = end / fb_info->fix.line_length;
197 if (y2 >= fb_info->var.yres)
198 y2 = fb_info->var.yres - 1;
199 if (miny > y1)
200 miny = y1;
201 if (maxy < y2)
202 maxy = y2;
203 }
204 xenfb_refresh(info, 0, miny, fb_info->var.xres, maxy - miny + 1);
205}
206
207static struct fb_deferred_io xenfb_defio = {
208 .delay = HZ / 20,
209 .deferred_io = xenfb_deferred_io,
210};
211
212static int xenfb_setcolreg(unsigned regno, unsigned red, unsigned green,
213 unsigned blue, unsigned transp,
214 struct fb_info *info)
215{
216 u32 v;
217
218 if (regno > info->cmap.len)
219 return 1;
220
221#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
222 red = CNVT_TOHW(red, info->var.red.length);
223 green = CNVT_TOHW(green, info->var.green.length);
224 blue = CNVT_TOHW(blue, info->var.blue.length);
225 transp = CNVT_TOHW(transp, info->var.transp.length);
226#undef CNVT_TOHW
227
228 v = (red << info->var.red.offset) |
229 (green << info->var.green.offset) |
230 (blue << info->var.blue.offset);
231
232 switch (info->var.bits_per_pixel) {
233 case 16:
234 case 24:
235 case 32:
236 ((u32 *)info->pseudo_palette)[regno] = v;
237 break;
238 }
239
240 return 0;
241}
242
243static void xenfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
244{
245 struct xenfb_info *info = p->par;
246
247 sys_fillrect(p, rect);
248 xenfb_refresh(info, rect->dx, rect->dy, rect->width, rect->height);
249}
250
251static void xenfb_imageblit(struct fb_info *p, const struct fb_image *image)
252{
253 struct xenfb_info *info = p->par;
254
255 sys_imageblit(p, image);
256 xenfb_refresh(info, image->dx, image->dy, image->width, image->height);
257}
258
259static void xenfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
260{
261 struct xenfb_info *info = p->par;
262
263 sys_copyarea(p, area);
264 xenfb_refresh(info, area->dx, area->dy, area->width, area->height);
265}
266
267static ssize_t xenfb_write(struct fb_info *p, const char __user *buf,
268 size_t count, loff_t *ppos)
269{
270 struct xenfb_info *info = p->par;
271 ssize_t res;
272
273 res = fb_sys_write(p, buf, count, ppos);
274 xenfb_refresh(info, 0, 0, info->page->width, info->page->height);
275 return res;
276}
277
278static int
279xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
280{
281 struct xenfb_info *xenfb_info;
282 int required_mem_len;
283
284 xenfb_info = info->par;
285
286 if (!xenfb_info->feature_resize) {
287 if (var->xres == video[KPARAM_WIDTH] &&
288 var->yres == video[KPARAM_HEIGHT] &&
289 var->bits_per_pixel == xenfb_info->page->depth) {
290 return 0;
291 }
292 return -EINVAL;
293 }
294
295
296 if (var->xres > video[KPARAM_WIDTH] || var->yres > video[KPARAM_HEIGHT])
297 return -EINVAL;
298
299 required_mem_len = var->xres * var->yres * xenfb_info->page->depth / 8;
300 if (var->bits_per_pixel == xenfb_info->page->depth &&
301 var->xres <= info->fix.line_length / (XENFB_DEPTH / 8) &&
302 required_mem_len <= info->fix.smem_len) {
303 var->xres_virtual = var->xres;
304 var->yres_virtual = var->yres;
305 return 0;
306 }
307 return -EINVAL;
308}
309
310static int xenfb_set_par(struct fb_info *info)
311{
312 struct xenfb_info *xenfb_info;
313 unsigned long flags;
314
315 xenfb_info = info->par;
316
317 spin_lock_irqsave(&xenfb_info->resize_lock, flags);
318 xenfb_info->resize.type = XENFB_TYPE_RESIZE;
319 xenfb_info->resize.width = info->var.xres;
320 xenfb_info->resize.height = info->var.yres;
321 xenfb_info->resize.stride = info->fix.line_length;
322 xenfb_info->resize.depth = info->var.bits_per_pixel;
323 xenfb_info->resize.offset = 0;
324 xenfb_info->resize_dpy = 1;
325 spin_unlock_irqrestore(&xenfb_info->resize_lock, flags);
326 return 0;
327}
328
329static struct fb_ops xenfb_fb_ops = {
330 .owner = THIS_MODULE,
331 .fb_read = fb_sys_read,
332 .fb_write = xenfb_write,
333 .fb_setcolreg = xenfb_setcolreg,
334 .fb_fillrect = xenfb_fillrect,
335 .fb_copyarea = xenfb_copyarea,
336 .fb_imageblit = xenfb_imageblit,
337 .fb_check_var = xenfb_check_var,
338 .fb_set_par = xenfb_set_par,
339};
340
341static irqreturn_t xenfb_event_handler(int rq, void *dev_id)
342{
343
344
345
346
347
348 struct xenfb_info *info = dev_id;
349 struct xenfb_page *page = info->page;
350
351 if (page->in_cons != page->in_prod) {
352 info->page->in_cons = info->page->in_prod;
353 notify_remote_via_irq(info->irq);
354 }
355
356
357 xenfb_refresh(info, INT_MAX, INT_MAX, -INT_MAX, -INT_MAX);
358
359 return IRQ_HANDLED;
360}
361
362static int xenfb_probe(struct xenbus_device *dev,
363 const struct xenbus_device_id *id)
364{
365 struct xenfb_info *info;
366 struct fb_info *fb_info;
367 int fb_size;
368 int val;
369 int ret = 0;
370
371 info = kzalloc(sizeof(*info), GFP_KERNEL);
372 if (info == NULL) {
373 xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
374 return -ENOMEM;
375 }
376
377
378 if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) {
379 if (val < video[KPARAM_MEM])
380 video[KPARAM_MEM] = val;
381 }
382
383
384 fb_size = video[KPARAM_MEM] * 1024 * 1024;
385 if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH / 8
386 > fb_size) {
387 video[KPARAM_WIDTH] = XENFB_WIDTH;
388 video[KPARAM_HEIGHT] = XENFB_HEIGHT;
389 fb_size = XENFB_DEFAULT_FB_LEN;
390 }
391
392 dev_set_drvdata(&dev->dev, info);
393 info->xbdev = dev;
394 info->irq = -1;
395 info->x1 = info->y1 = INT_MAX;
396 spin_lock_init(&info->dirty_lock);
397 spin_lock_init(&info->resize_lock);
398
399 info->fb = vzalloc(fb_size);
400 if (info->fb == NULL)
401 goto error_nomem;
402
403 info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
404
405 info->mfns = vmalloc(sizeof(unsigned long) * info->nr_pages);
406 if (!info->mfns)
407 goto error_nomem;
408
409
410 info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
411 if (!info->page)
412 goto error_nomem;
413
414
415 fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL);
416 if (fb_info == NULL)
417 goto error_nomem;
418
419
420 fb_info->pseudo_palette = fb_info->par;
421 fb_info->par = info;
422
423 fb_info->screen_base = info->fb;
424
425 fb_info->fbops = &xenfb_fb_ops;
426 fb_info->var.xres_virtual = fb_info->var.xres = video[KPARAM_WIDTH];
427 fb_info->var.yres_virtual = fb_info->var.yres = video[KPARAM_HEIGHT];
428 fb_info->var.bits_per_pixel = XENFB_DEPTH;
429
430 fb_info->var.red = (struct fb_bitfield){16, 8, 0};
431 fb_info->var.green = (struct fb_bitfield){8, 8, 0};
432 fb_info->var.blue = (struct fb_bitfield){0, 8, 0};
433
434 fb_info->var.activate = FB_ACTIVATE_NOW;
435 fb_info->var.height = -1;
436 fb_info->var.width = -1;
437 fb_info->var.vmode = FB_VMODE_NONINTERLACED;
438
439 fb_info->fix.visual = FB_VISUAL_TRUECOLOR;
440 fb_info->fix.line_length = fb_info->var.xres * XENFB_DEPTH / 8;
441 fb_info->fix.smem_start = 0;
442 fb_info->fix.smem_len = fb_size;
443 strcpy(fb_info->fix.id, "xen");
444 fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
445 fb_info->fix.accel = FB_ACCEL_NONE;
446
447 fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
448
449 ret = fb_alloc_cmap(&fb_info->cmap, 256, 0);
450 if (ret < 0) {
451 framebuffer_release(fb_info);
452 xenbus_dev_fatal(dev, ret, "fb_alloc_cmap");
453 goto error;
454 }
455
456 fb_info->fbdefio = &xenfb_defio;
457 fb_deferred_io_init(fb_info);
458
459 xenfb_init_shared_page(info, fb_info);
460
461 ret = xenfb_connect_backend(dev, info);
462 if (ret < 0) {
463 xenbus_dev_fatal(dev, ret, "xenfb_connect_backend");
464 goto error_fb;
465 }
466
467 ret = register_framebuffer(fb_info);
468 if (ret) {
469 xenbus_dev_fatal(dev, ret, "register_framebuffer");
470 goto error_fb;
471 }
472 info->fb_info = fb_info;
473
474 xenfb_make_preferred_console();
475 return 0;
476
477error_fb:
478 fb_deferred_io_cleanup(fb_info);
479 fb_dealloc_cmap(&fb_info->cmap);
480 framebuffer_release(fb_info);
481error_nomem:
482 if (!ret) {
483 ret = -ENOMEM;
484 xenbus_dev_fatal(dev, ret, "allocating device memory");
485 }
486error:
487 xenfb_remove(dev);
488 return ret;
489}
490
491static void xenfb_make_preferred_console(void)
492{
493 struct console *c;
494
495 if (console_set_on_cmdline)
496 return;
497
498 console_lock();
499 for_each_console(c) {
500 if (!strcmp(c->name, "tty") && c->index == 0)
501 break;
502 }
503 console_unlock();
504 if (c) {
505 unregister_console(c);
506 c->flags |= CON_CONSDEV;
507 c->flags &= ~CON_PRINTBUFFER;
508 register_console(c);
509 }
510}
511
512static int xenfb_resume(struct xenbus_device *dev)
513{
514 struct xenfb_info *info = dev_get_drvdata(&dev->dev);
515
516 xenfb_disconnect_backend(info);
517 xenfb_init_shared_page(info, info->fb_info);
518 return xenfb_connect_backend(dev, info);
519}
520
521static int xenfb_remove(struct xenbus_device *dev)
522{
523 struct xenfb_info *info = dev_get_drvdata(&dev->dev);
524
525 xenfb_disconnect_backend(info);
526 if (info->fb_info) {
527 fb_deferred_io_cleanup(info->fb_info);
528 unregister_framebuffer(info->fb_info);
529 fb_dealloc_cmap(&info->fb_info->cmap);
530 framebuffer_release(info->fb_info);
531 }
532 free_page((unsigned long)info->page);
533 vfree(info->mfns);
534 vfree(info->fb);
535 kfree(info);
536
537 return 0;
538}
539
540static unsigned long vmalloc_to_mfn(void *address)
541{
542 return pfn_to_mfn(vmalloc_to_pfn(address));
543}
544
545static void xenfb_init_shared_page(struct xenfb_info *info,
546 struct fb_info *fb_info)
547{
548 int i;
549 int epd = PAGE_SIZE / sizeof(info->mfns[0]);
550
551 for (i = 0; i < info->nr_pages; i++)
552 info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE);
553
554 for (i = 0; i * epd < info->nr_pages; i++)
555 info->page->pd[i] = vmalloc_to_mfn(&info->mfns[i * epd]);
556
557 info->page->width = fb_info->var.xres;
558 info->page->height = fb_info->var.yres;
559 info->page->depth = fb_info->var.bits_per_pixel;
560 info->page->line_length = fb_info->fix.line_length;
561 info->page->mem_length = fb_info->fix.smem_len;
562 info->page->in_cons = info->page->in_prod = 0;
563 info->page->out_cons = info->page->out_prod = 0;
564}
565
566static int xenfb_connect_backend(struct xenbus_device *dev,
567 struct xenfb_info *info)
568{
569 int ret, evtchn, irq;
570 struct xenbus_transaction xbt;
571
572 ret = xenbus_alloc_evtchn(dev, &evtchn);
573 if (ret)
574 return ret;
575 irq = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler,
576 0, dev->devicetype, info);
577 if (irq < 0) {
578 xenbus_free_evtchn(dev, evtchn);
579 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
580 return irq;
581 }
582 again:
583 ret = xenbus_transaction_start(&xbt);
584 if (ret) {
585 xenbus_dev_fatal(dev, ret, "starting transaction");
586 goto unbind_irq;
587 }
588 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
589 virt_to_mfn(info->page));
590 if (ret)
591 goto error_xenbus;
592 ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
593 evtchn);
594 if (ret)
595 goto error_xenbus;
596 ret = xenbus_printf(xbt, dev->nodename, "protocol", "%s",
597 XEN_IO_PROTO_ABI_NATIVE);
598 if (ret)
599 goto error_xenbus;
600 ret = xenbus_printf(xbt, dev->nodename, "feature-update", "1");
601 if (ret)
602 goto error_xenbus;
603 ret = xenbus_transaction_end(xbt, 0);
604 if (ret) {
605 if (ret == -EAGAIN)
606 goto again;
607 xenbus_dev_fatal(dev, ret, "completing transaction");
608 goto unbind_irq;
609 }
610
611 xenbus_switch_state(dev, XenbusStateInitialised);
612 info->irq = irq;
613 return 0;
614
615 error_xenbus:
616 xenbus_transaction_end(xbt, 1);
617 xenbus_dev_fatal(dev, ret, "writing xenstore");
618 unbind_irq:
619 unbind_from_irqhandler(irq, info);
620 return ret;
621}
622
623static void xenfb_disconnect_backend(struct xenfb_info *info)
624{
625
626 info->update_wanted = 0;
627 if (info->irq >= 0)
628 unbind_from_irqhandler(info->irq, info);
629 info->irq = -1;
630}
631
632static void xenfb_backend_changed(struct xenbus_device *dev,
633 enum xenbus_state backend_state)
634{
635 struct xenfb_info *info = dev_get_drvdata(&dev->dev);
636 int val;
637
638 switch (backend_state) {
639 case XenbusStateInitialising:
640 case XenbusStateInitialised:
641 case XenbusStateReconfiguring:
642 case XenbusStateReconfigured:
643 case XenbusStateUnknown:
644 break;
645
646 case XenbusStateInitWait:
647InitWait:
648 xenbus_switch_state(dev, XenbusStateConnected);
649 break;
650
651 case XenbusStateConnected:
652
653
654
655
656
657 if (dev->state != XenbusStateConnected)
658 goto InitWait;
659
660 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
661 "request-update", "%d", &val) < 0)
662 val = 0;
663 if (val)
664 info->update_wanted = 1;
665
666 if (xenbus_scanf(XBT_NIL, dev->otherend,
667 "feature-resize", "%d", &val) < 0)
668 val = 0;
669 info->feature_resize = val;
670 break;
671
672 case XenbusStateClosed:
673 if (dev->state == XenbusStateClosed)
674 break;
675
676 case XenbusStateClosing:
677 xenbus_frontend_closed(dev);
678 break;
679 }
680}
681
682static const struct xenbus_device_id xenfb_ids[] = {
683 { "vfb" },
684 { "" }
685};
686
687static DEFINE_XENBUS_DRIVER(xenfb, ,
688 .probe = xenfb_probe,
689 .remove = xenfb_remove,
690 .resume = xenfb_resume,
691 .otherend_changed = xenfb_backend_changed,
692);
693
694static int __init xenfb_init(void)
695{
696 if (!xen_pv_domain())
697 return -ENODEV;
698
699
700 if (xen_initial_domain())
701 return -ENODEV;
702
703 if (!xen_has_pv_devices())
704 return -ENODEV;
705
706 return xenbus_register_frontend(&xenfb_driver);
707}
708
709static void __exit xenfb_cleanup(void)
710{
711 xenbus_unregister_driver(&xenfb_driver);
712}
713
714module_init(xenfb_init);
715module_exit(xenfb_cleanup);
716
717MODULE_DESCRIPTION("Xen virtual framebuffer device frontend");
718MODULE_LICENSE("GPL");
719MODULE_ALIAS("xen:vfb");
720
