Commit | Line | Data |
---|---|---|
4ee36dc0 MA |
1 | /* |
2 | * Xen para-virtual frame buffer device | |
3 | * | |
4 | * Copyright (C) 2005-2006 Anthony Liguori <aliguori@us.ibm.com> | |
5 | * Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com> | |
6 | * | |
7 | * Based on linux/drivers/video/q40fb.c | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file COPYING in the main directory of this archive for | |
11 | * more details. | |
12 | */ | |
13 | ||
14 | /* | |
15 | * TODO: | |
16 | * | |
17 | * Switch to grant tables when they become capable of dealing with the | |
18 | * frame buffer. | |
19 | */ | |
20 | ||
9e124fe1 | 21 | #include <linux/console.h> |
4ee36dc0 MA |
22 | #include <linux/kernel.h> |
23 | #include <linux/errno.h> | |
24 | #include <linux/fb.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/mm.h> | |
1ccbf534 | 28 | |
4ee36dc0 | 29 | #include <asm/xen/hypervisor.h> |
1ccbf534 JF |
30 | |
31 | #include <xen/xen.h> | |
4ee36dc0 MA |
32 | #include <xen/events.h> |
33 | #include <xen/page.h> | |
34 | #include <xen/interface/io/fbif.h> | |
35 | #include <xen/interface/io/protocols.h> | |
36 | #include <xen/xenbus.h> | |
37 | ||
38 | struct xenfb_info { | |
39 | unsigned char *fb; | |
40 | struct fb_info *fb_info; | |
41 | int x1, y1, x2, y2; /* dirty rectangle, | |
42 | protected by dirty_lock */ | |
43 | spinlock_t dirty_lock; | |
44 | int nr_pages; | |
45 | int irq; | |
46 | struct xenfb_page *page; | |
47 | unsigned long *mfns; | |
48 | int update_wanted; /* XENFB_TYPE_UPDATE wanted */ | |
e4dcff1f MA |
49 | int feature_resize; /* XENFB_TYPE_RESIZE ok */ |
50 | struct xenfb_resize resize; /* protected by resize_lock */ | |
51 | int resize_dpy; /* ditto */ | |
52 | spinlock_t resize_lock; | |
4ee36dc0 MA |
53 | |
54 | struct xenbus_device *xbdev; | |
55 | }; | |
56 | ||
e4dcff1f MA |
57 | #define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8) |
58 | ||
59 | enum { KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT }; | |
60 | static int video[KPARAM_CNT] = { 2, XENFB_WIDTH, XENFB_HEIGHT }; | |
61 | module_param_array(video, int, NULL, 0); | |
62 | MODULE_PARM_DESC(video, | |
63 | "Video memory size in MB, width, height in pixels (default 2,800,600)"); | |
4ee36dc0 | 64 | |
9e124fe1 | 65 | static void xenfb_make_preferred_console(void); |
4ee36dc0 | 66 | static int xenfb_remove(struct xenbus_device *); |
e4dcff1f | 67 | static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *); |
4ee36dc0 MA |
68 | static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *); |
69 | static void xenfb_disconnect_backend(struct xenfb_info *); | |
70 | ||
e4dcff1f MA |
71 | static void xenfb_send_event(struct xenfb_info *info, |
72 | union xenfb_out_event *event) | |
73 | { | |
74 | u32 prod; | |
75 | ||
76 | prod = info->page->out_prod; | |
77 | /* caller ensures !xenfb_queue_full() */ | |
78 | mb(); /* ensure ring space available */ | |
79 | XENFB_OUT_RING_REF(info->page, prod) = *event; | |
80 | wmb(); /* ensure ring contents visible */ | |
81 | info->page->out_prod = prod + 1; | |
82 | ||
83 | notify_remote_via_irq(info->irq); | |
84 | } | |
85 | ||
4ee36dc0 MA |
86 | static void xenfb_do_update(struct xenfb_info *info, |
87 | int x, int y, int w, int h) | |
88 | { | |
89 | union xenfb_out_event event; | |
4ee36dc0 | 90 | |
f4ad1ebd | 91 | memset(&event, 0, sizeof(event)); |
4ee36dc0 MA |
92 | event.type = XENFB_TYPE_UPDATE; |
93 | event.update.x = x; | |
94 | event.update.y = y; | |
95 | event.update.width = w; | |
96 | event.update.height = h; | |
97 | ||
4ee36dc0 | 98 | /* caller ensures !xenfb_queue_full() */ |
e4dcff1f MA |
99 | xenfb_send_event(info, &event); |
100 | } | |
4ee36dc0 | 101 | |
e4dcff1f MA |
102 | static void xenfb_do_resize(struct xenfb_info *info) |
103 | { | |
104 | union xenfb_out_event event; | |
105 | ||
106 | memset(&event, 0, sizeof(event)); | |
107 | event.resize = info->resize; | |
108 | ||
109 | /* caller ensures !xenfb_queue_full() */ | |
110 | xenfb_send_event(info, &event); | |
4ee36dc0 MA |
111 | } |
112 | ||
113 | static int xenfb_queue_full(struct xenfb_info *info) | |
114 | { | |
115 | u32 cons, prod; | |
116 | ||
117 | prod = info->page->out_prod; | |
118 | cons = info->page->out_cons; | |
119 | return prod - cons == XENFB_OUT_RING_LEN; | |
120 | } | |
121 | ||
e4dcff1f MA |
122 | static void xenfb_handle_resize_dpy(struct xenfb_info *info) |
123 | { | |
124 | unsigned long flags; | |
125 | ||
126 | spin_lock_irqsave(&info->resize_lock, flags); | |
127 | if (info->resize_dpy) { | |
128 | if (!xenfb_queue_full(info)) { | |
129 | info->resize_dpy = 0; | |
130 | xenfb_do_resize(info); | |
131 | } | |
132 | } | |
133 | spin_unlock_irqrestore(&info->resize_lock, flags); | |
134 | } | |
135 | ||
4ee36dc0 MA |
136 | static void xenfb_refresh(struct xenfb_info *info, |
137 | int x1, int y1, int w, int h) | |
138 | { | |
139 | unsigned long flags; | |
4ee36dc0 | 140 | int x2 = x1 + w - 1; |
e4dcff1f MA |
141 | int y2 = y1 + h - 1; |
142 | ||
143 | xenfb_handle_resize_dpy(info); | |
4ee36dc0 MA |
144 | |
145 | if (!info->update_wanted) | |
146 | return; | |
147 | ||
148 | spin_lock_irqsave(&info->dirty_lock, flags); | |
149 | ||
150 | /* Combine with dirty rectangle: */ | |
151 | if (info->y1 < y1) | |
152 | y1 = info->y1; | |
153 | if (info->y2 > y2) | |
154 | y2 = info->y2; | |
155 | if (info->x1 < x1) | |
156 | x1 = info->x1; | |
157 | if (info->x2 > x2) | |
158 | x2 = info->x2; | |
159 | ||
160 | if (xenfb_queue_full(info)) { | |
161 | /* Can't send right now, stash it in the dirty rectangle */ | |
162 | info->x1 = x1; | |
163 | info->x2 = x2; | |
164 | info->y1 = y1; | |
165 | info->y2 = y2; | |
166 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
167 | return; | |
168 | } | |
169 | ||
170 | /* Clear dirty rectangle: */ | |
171 | info->x1 = info->y1 = INT_MAX; | |
172 | info->x2 = info->y2 = 0; | |
173 | ||
174 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
175 | ||
176 | if (x1 <= x2 && y1 <= y2) | |
177 | xenfb_do_update(info, x1, y1, x2 - x1 + 1, y2 - y1 + 1); | |
178 | } | |
179 | ||
180 | static void xenfb_deferred_io(struct fb_info *fb_info, | |
181 | struct list_head *pagelist) | |
182 | { | |
183 | struct xenfb_info *info = fb_info->par; | |
184 | struct page *page; | |
185 | unsigned long beg, end; | |
186 | int y1, y2, miny, maxy; | |
187 | ||
188 | miny = INT_MAX; | |
189 | maxy = 0; | |
190 | list_for_each_entry(page, pagelist, lru) { | |
191 | beg = page->index << PAGE_SHIFT; | |
192 | end = beg + PAGE_SIZE - 1; | |
193 | y1 = beg / fb_info->fix.line_length; | |
194 | y2 = end / fb_info->fix.line_length; | |
195 | if (y2 >= fb_info->var.yres) | |
196 | y2 = fb_info->var.yres - 1; | |
197 | if (miny > y1) | |
198 | miny = y1; | |
199 | if (maxy < y2) | |
200 | maxy = y2; | |
201 | } | |
202 | xenfb_refresh(info, 0, miny, fb_info->var.xres, maxy - miny + 1); | |
203 | } | |
204 | ||
205 | static struct fb_deferred_io xenfb_defio = { | |
206 | .delay = HZ / 20, | |
207 | .deferred_io = xenfb_deferred_io, | |
208 | }; | |
209 | ||
210 | static int xenfb_setcolreg(unsigned regno, unsigned red, unsigned green, | |
211 | unsigned blue, unsigned transp, | |
212 | struct fb_info *info) | |
213 | { | |
214 | u32 v; | |
215 | ||
216 | if (regno > info->cmap.len) | |
217 | return 1; | |
218 | ||
219 | #define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16) | |
220 | red = CNVT_TOHW(red, info->var.red.length); | |
221 | green = CNVT_TOHW(green, info->var.green.length); | |
222 | blue = CNVT_TOHW(blue, info->var.blue.length); | |
223 | transp = CNVT_TOHW(transp, info->var.transp.length); | |
224 | #undef CNVT_TOHW | |
225 | ||
226 | v = (red << info->var.red.offset) | | |
227 | (green << info->var.green.offset) | | |
228 | (blue << info->var.blue.offset); | |
229 | ||
230 | switch (info->var.bits_per_pixel) { | |
231 | case 16: | |
232 | case 24: | |
233 | case 32: | |
234 | ((u32 *)info->pseudo_palette)[regno] = v; | |
235 | break; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static void xenfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect) | |
242 | { | |
243 | struct xenfb_info *info = p->par; | |
244 | ||
245 | sys_fillrect(p, rect); | |
246 | xenfb_refresh(info, rect->dx, rect->dy, rect->width, rect->height); | |
247 | } | |
248 | ||
249 | static void xenfb_imageblit(struct fb_info *p, const struct fb_image *image) | |
250 | { | |
251 | struct xenfb_info *info = p->par; | |
252 | ||
253 | sys_imageblit(p, image); | |
254 | xenfb_refresh(info, image->dx, image->dy, image->width, image->height); | |
255 | } | |
256 | ||
257 | static void xenfb_copyarea(struct fb_info *p, const struct fb_copyarea *area) | |
258 | { | |
259 | struct xenfb_info *info = p->par; | |
260 | ||
261 | sys_copyarea(p, area); | |
262 | xenfb_refresh(info, area->dx, area->dy, area->width, area->height); | |
263 | } | |
264 | ||
265 | static ssize_t xenfb_write(struct fb_info *p, const char __user *buf, | |
266 | size_t count, loff_t *ppos) | |
267 | { | |
268 | struct xenfb_info *info = p->par; | |
269 | ssize_t res; | |
270 | ||
271 | res = fb_sys_write(p, buf, count, ppos); | |
272 | xenfb_refresh(info, 0, 0, info->page->width, info->page->height); | |
273 | return res; | |
274 | } | |
275 | ||
e4dcff1f MA |
276 | static int |
277 | xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
278 | { | |
279 | struct xenfb_info *xenfb_info; | |
280 | int required_mem_len; | |
281 | ||
282 | xenfb_info = info->par; | |
283 | ||
284 | if (!xenfb_info->feature_resize) { | |
285 | if (var->xres == video[KPARAM_WIDTH] && | |
286 | var->yres == video[KPARAM_HEIGHT] && | |
287 | var->bits_per_pixel == xenfb_info->page->depth) { | |
288 | return 0; | |
289 | } | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | /* Can't resize past initial width and height */ | |
294 | if (var->xres > video[KPARAM_WIDTH] || var->yres > video[KPARAM_HEIGHT]) | |
295 | return -EINVAL; | |
296 | ||
297 | required_mem_len = var->xres * var->yres * xenfb_info->page->depth / 8; | |
298 | if (var->bits_per_pixel == xenfb_info->page->depth && | |
299 | var->xres <= info->fix.line_length / (XENFB_DEPTH / 8) && | |
300 | required_mem_len <= info->fix.smem_len) { | |
301 | var->xres_virtual = var->xres; | |
302 | var->yres_virtual = var->yres; | |
303 | return 0; | |
304 | } | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | static int xenfb_set_par(struct fb_info *info) | |
309 | { | |
310 | struct xenfb_info *xenfb_info; | |
311 | unsigned long flags; | |
312 | ||
313 | xenfb_info = info->par; | |
314 | ||
315 | spin_lock_irqsave(&xenfb_info->resize_lock, flags); | |
316 | xenfb_info->resize.type = XENFB_TYPE_RESIZE; | |
317 | xenfb_info->resize.width = info->var.xres; | |
318 | xenfb_info->resize.height = info->var.yres; | |
319 | xenfb_info->resize.stride = info->fix.line_length; | |
320 | xenfb_info->resize.depth = info->var.bits_per_pixel; | |
321 | xenfb_info->resize.offset = 0; | |
322 | xenfb_info->resize_dpy = 1; | |
323 | spin_unlock_irqrestore(&xenfb_info->resize_lock, flags); | |
324 | return 0; | |
325 | } | |
326 | ||
4ee36dc0 MA |
327 | static struct fb_ops xenfb_fb_ops = { |
328 | .owner = THIS_MODULE, | |
329 | .fb_read = fb_sys_read, | |
330 | .fb_write = xenfb_write, | |
331 | .fb_setcolreg = xenfb_setcolreg, | |
332 | .fb_fillrect = xenfb_fillrect, | |
333 | .fb_copyarea = xenfb_copyarea, | |
334 | .fb_imageblit = xenfb_imageblit, | |
e4dcff1f MA |
335 | .fb_check_var = xenfb_check_var, |
336 | .fb_set_par = xenfb_set_par, | |
4ee36dc0 MA |
337 | }; |
338 | ||
339 | static irqreturn_t xenfb_event_handler(int rq, void *dev_id) | |
340 | { | |
341 | /* | |
342 | * No in events recognized, simply ignore them all. | |
343 | * If you need to recognize some, see xen-kbdfront's | |
344 | * input_handler() for how to do that. | |
345 | */ | |
346 | struct xenfb_info *info = dev_id; | |
347 | struct xenfb_page *page = info->page; | |
348 | ||
349 | if (page->in_cons != page->in_prod) { | |
350 | info->page->in_cons = info->page->in_prod; | |
351 | notify_remote_via_irq(info->irq); | |
352 | } | |
353 | ||
354 | /* Flush dirty rectangle: */ | |
355 | xenfb_refresh(info, INT_MAX, INT_MAX, -INT_MAX, -INT_MAX); | |
356 | ||
357 | return IRQ_HANDLED; | |
358 | } | |
359 | ||
360 | static int __devinit xenfb_probe(struct xenbus_device *dev, | |
361 | const struct xenbus_device_id *id) | |
362 | { | |
363 | struct xenfb_info *info; | |
364 | struct fb_info *fb_info; | |
e4dcff1f MA |
365 | int fb_size; |
366 | int val; | |
4ee36dc0 MA |
367 | int ret; |
368 | ||
369 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
370 | if (info == NULL) { | |
371 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); | |
372 | return -ENOMEM; | |
373 | } | |
e4dcff1f MA |
374 | |
375 | /* Limit kernel param videoram amount to what is in xenstore */ | |
376 | if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) { | |
377 | if (val < video[KPARAM_MEM]) | |
378 | video[KPARAM_MEM] = val; | |
379 | } | |
380 | ||
381 | /* If requested res does not fit in available memory, use default */ | |
382 | fb_size = video[KPARAM_MEM] * 1024 * 1024; | |
383 | if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH / 8 | |
384 | > fb_size) { | |
385 | video[KPARAM_WIDTH] = XENFB_WIDTH; | |
386 | video[KPARAM_HEIGHT] = XENFB_HEIGHT; | |
387 | fb_size = XENFB_DEFAULT_FB_LEN; | |
388 | } | |
389 | ||
1b713e00 | 390 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
391 | info->xbdev = dev; |
392 | info->irq = -1; | |
393 | info->x1 = info->y1 = INT_MAX; | |
394 | spin_lock_init(&info->dirty_lock); | |
e4dcff1f | 395 | spin_lock_init(&info->resize_lock); |
4ee36dc0 | 396 | |
e4dcff1f | 397 | info->fb = vmalloc(fb_size); |
4ee36dc0 MA |
398 | if (info->fb == NULL) |
399 | goto error_nomem; | |
e4dcff1f | 400 | memset(info->fb, 0, fb_size); |
4ee36dc0 | 401 | |
e4dcff1f | 402 | info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4ee36dc0 MA |
403 | |
404 | info->mfns = vmalloc(sizeof(unsigned long) * info->nr_pages); | |
405 | if (!info->mfns) | |
406 | goto error_nomem; | |
407 | ||
408 | /* set up shared page */ | |
409 | info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
410 | if (!info->page) | |
411 | goto error_nomem; | |
412 | ||
4ee36dc0 MA |
413 | /* abusing framebuffer_alloc() to allocate pseudo_palette */ |
414 | fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL); | |
415 | if (fb_info == NULL) | |
416 | goto error_nomem; | |
417 | ||
418 | /* complete the abuse: */ | |
419 | fb_info->pseudo_palette = fb_info->par; | |
420 | fb_info->par = info; | |
421 | ||
422 | fb_info->screen_base = info->fb; | |
423 | ||
424 | fb_info->fbops = &xenfb_fb_ops; | |
e4dcff1f MA |
425 | fb_info->var.xres_virtual = fb_info->var.xres = video[KPARAM_WIDTH]; |
426 | fb_info->var.yres_virtual = fb_info->var.yres = video[KPARAM_HEIGHT]; | |
427 | fb_info->var.bits_per_pixel = XENFB_DEPTH; | |
4ee36dc0 MA |
428 | |
429 | fb_info->var.red = (struct fb_bitfield){16, 8, 0}; | |
430 | fb_info->var.green = (struct fb_bitfield){8, 8, 0}; | |
431 | fb_info->var.blue = (struct fb_bitfield){0, 8, 0}; | |
432 | ||
433 | fb_info->var.activate = FB_ACTIVATE_NOW; | |
434 | fb_info->var.height = -1; | |
435 | fb_info->var.width = -1; | |
436 | fb_info->var.vmode = FB_VMODE_NONINTERLACED; | |
437 | ||
438 | fb_info->fix.visual = FB_VISUAL_TRUECOLOR; | |
e4dcff1f | 439 | fb_info->fix.line_length = fb_info->var.xres * XENFB_DEPTH / 8; |
4ee36dc0 | 440 | fb_info->fix.smem_start = 0; |
e4dcff1f | 441 | fb_info->fix.smem_len = fb_size; |
4ee36dc0 MA |
442 | strcpy(fb_info->fix.id, "xen"); |
443 | fb_info->fix.type = FB_TYPE_PACKED_PIXELS; | |
444 | fb_info->fix.accel = FB_ACCEL_NONE; | |
445 | ||
df11303c | 446 | fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; |
4ee36dc0 MA |
447 | |
448 | ret = fb_alloc_cmap(&fb_info->cmap, 256, 0); | |
449 | if (ret < 0) { | |
450 | framebuffer_release(fb_info); | |
451 | xenbus_dev_fatal(dev, ret, "fb_alloc_cmap"); | |
452 | goto error; | |
453 | } | |
454 | ||
455 | fb_info->fbdefio = &xenfb_defio; | |
456 | fb_deferred_io_init(fb_info); | |
457 | ||
e4dcff1f MA |
458 | xenfb_init_shared_page(info, fb_info); |
459 | ||
0a80fb10 JF |
460 | ret = xenfb_connect_backend(dev, info); |
461 | if (ret < 0) | |
462 | goto error; | |
463 | ||
4ee36dc0 MA |
464 | ret = register_framebuffer(fb_info); |
465 | if (ret) { | |
466 | fb_deferred_io_cleanup(fb_info); | |
467 | fb_dealloc_cmap(&fb_info->cmap); | |
468 | framebuffer_release(fb_info); | |
469 | xenbus_dev_fatal(dev, ret, "register_framebuffer"); | |
470 | goto error; | |
471 | } | |
472 | info->fb_info = fb_info; | |
473 | ||
9e124fe1 | 474 | xenfb_make_preferred_console(); |
4ee36dc0 MA |
475 | return 0; |
476 | ||
477 | error_nomem: | |
478 | ret = -ENOMEM; | |
479 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
480 | error: | |
481 | xenfb_remove(dev); | |
482 | return ret; | |
483 | } | |
484 | ||
9e124fe1 MA |
485 | static __devinit void |
486 | xenfb_make_preferred_console(void) | |
487 | { | |
488 | struct console *c; | |
489 | ||
490 | if (console_set_on_cmdline) | |
491 | return; | |
492 | ||
493 | acquire_console_sem(); | |
494 | for (c = console_drivers; c; c = c->next) { | |
495 | if (!strcmp(c->name, "tty") && c->index == 0) | |
496 | break; | |
497 | } | |
498 | release_console_sem(); | |
499 | if (c) { | |
500 | unregister_console(c); | |
501 | c->flags |= CON_CONSDEV; | |
502 | c->flags &= ~CON_PRINTBUFFER; /* don't print again */ | |
503 | register_console(c); | |
504 | } | |
505 | } | |
506 | ||
4ee36dc0 MA |
507 | static int xenfb_resume(struct xenbus_device *dev) |
508 | { | |
1b713e00 | 509 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
510 | |
511 | xenfb_disconnect_backend(info); | |
e4dcff1f | 512 | xenfb_init_shared_page(info, info->fb_info); |
4ee36dc0 MA |
513 | return xenfb_connect_backend(dev, info); |
514 | } | |
515 | ||
516 | static int xenfb_remove(struct xenbus_device *dev) | |
517 | { | |
1b713e00 | 518 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
519 | |
520 | xenfb_disconnect_backend(info); | |
521 | if (info->fb_info) { | |
522 | fb_deferred_io_cleanup(info->fb_info); | |
523 | unregister_framebuffer(info->fb_info); | |
524 | fb_dealloc_cmap(&info->fb_info->cmap); | |
525 | framebuffer_release(info->fb_info); | |
526 | } | |
527 | free_page((unsigned long)info->page); | |
528 | vfree(info->mfns); | |
529 | vfree(info->fb); | |
530 | kfree(info); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | static unsigned long vmalloc_to_mfn(void *address) | |
536 | { | |
537 | return pfn_to_mfn(vmalloc_to_pfn(address)); | |
538 | } | |
539 | ||
e4dcff1f MA |
540 | static void xenfb_init_shared_page(struct xenfb_info *info, |
541 | struct fb_info *fb_info) | |
4ee36dc0 MA |
542 | { |
543 | int i; | |
e4dcff1f | 544 | int epd = PAGE_SIZE / sizeof(info->mfns[0]); |
4ee36dc0 MA |
545 | |
546 | for (i = 0; i < info->nr_pages; i++) | |
547 | info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE); | |
548 | ||
e4dcff1f MA |
549 | for (i = 0; i * epd < info->nr_pages; i++) |
550 | info->page->pd[i] = vmalloc_to_mfn(&info->mfns[i * epd]); | |
551 | ||
552 | info->page->width = fb_info->var.xres; | |
553 | info->page->height = fb_info->var.yres; | |
554 | info->page->depth = fb_info->var.bits_per_pixel; | |
555 | info->page->line_length = fb_info->fix.line_length; | |
556 | info->page->mem_length = fb_info->fix.smem_len; | |
4ee36dc0 MA |
557 | info->page->in_cons = info->page->in_prod = 0; |
558 | info->page->out_cons = info->page->out_prod = 0; | |
559 | } | |
560 | ||
561 | static int xenfb_connect_backend(struct xenbus_device *dev, | |
562 | struct xenfb_info *info) | |
563 | { | |
564 | int ret, evtchn; | |
565 | struct xenbus_transaction xbt; | |
566 | ||
567 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
568 | if (ret) | |
569 | return ret; | |
570 | ret = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, | |
571 | 0, dev->devicetype, info); | |
572 | if (ret < 0) { | |
573 | xenbus_free_evtchn(dev, evtchn); | |
574 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
575 | return ret; | |
576 | } | |
577 | info->irq = ret; | |
578 | ||
579 | again: | |
580 | ret = xenbus_transaction_start(&xbt); | |
581 | if (ret) { | |
582 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
583 | return ret; | |
584 | } | |
585 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
586 | virt_to_mfn(info->page)); | |
587 | if (ret) | |
588 | goto error_xenbus; | |
589 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
590 | evtchn); | |
591 | if (ret) | |
592 | goto error_xenbus; | |
593 | ret = xenbus_printf(xbt, dev->nodename, "protocol", "%s", | |
594 | XEN_IO_PROTO_ABI_NATIVE); | |
595 | if (ret) | |
596 | goto error_xenbus; | |
597 | ret = xenbus_printf(xbt, dev->nodename, "feature-update", "1"); | |
598 | if (ret) | |
599 | goto error_xenbus; | |
600 | ret = xenbus_transaction_end(xbt, 0); | |
601 | if (ret) { | |
602 | if (ret == -EAGAIN) | |
603 | goto again; | |
604 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
605 | return ret; | |
606 | } | |
607 | ||
608 | xenbus_switch_state(dev, XenbusStateInitialised); | |
609 | return 0; | |
610 | ||
611 | error_xenbus: | |
612 | xenbus_transaction_end(xbt, 1); | |
613 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
614 | return ret; | |
615 | } | |
616 | ||
617 | static void xenfb_disconnect_backend(struct xenfb_info *info) | |
618 | { | |
619 | if (info->irq >= 0) | |
620 | unbind_from_irqhandler(info->irq, info); | |
621 | info->irq = -1; | |
622 | } | |
623 | ||
624 | static void xenfb_backend_changed(struct xenbus_device *dev, | |
625 | enum xenbus_state backend_state) | |
626 | { | |
1b713e00 | 627 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
628 | int val; |
629 | ||
630 | switch (backend_state) { | |
631 | case XenbusStateInitialising: | |
632 | case XenbusStateInitialised: | |
633 | case XenbusStateUnknown: | |
634 | case XenbusStateClosed: | |
635 | break; | |
636 | ||
637 | case XenbusStateInitWait: | |
638 | InitWait: | |
639 | xenbus_switch_state(dev, XenbusStateConnected); | |
640 | break; | |
641 | ||
642 | case XenbusStateConnected: | |
643 | /* | |
644 | * Work around xenbus race condition: If backend goes | |
645 | * through InitWait to Connected fast enough, we can | |
646 | * get Connected twice here. | |
647 | */ | |
648 | if (dev->state != XenbusStateConnected) | |
649 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
650 | ||
651 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
652 | "request-update", "%d", &val) < 0) | |
653 | val = 0; | |
654 | if (val) | |
655 | info->update_wanted = 1; | |
e4dcff1f MA |
656 | |
657 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
658 | "feature-resize", "%d", &val) < 0) | |
659 | val = 0; | |
660 | info->feature_resize = val; | |
4ee36dc0 MA |
661 | break; |
662 | ||
663 | case XenbusStateClosing: | |
664 | xenbus_frontend_closed(dev); | |
665 | break; | |
666 | } | |
667 | } | |
668 | ||
669 | static struct xenbus_device_id xenfb_ids[] = { | |
670 | { "vfb" }, | |
671 | { "" } | |
672 | }; | |
673 | ||
ffb78a26 | 674 | static struct xenbus_driver xenfb_driver = { |
4ee36dc0 MA |
675 | .name = "vfb", |
676 | .owner = THIS_MODULE, | |
677 | .ids = xenfb_ids, | |
678 | .probe = xenfb_probe, | |
679 | .remove = xenfb_remove, | |
680 | .resume = xenfb_resume, | |
681 | .otherend_changed = xenfb_backend_changed, | |
682 | }; | |
683 | ||
684 | static int __init xenfb_init(void) | |
685 | { | |
6e833587 | 686 | if (!xen_domain()) |
4ee36dc0 MA |
687 | return -ENODEV; |
688 | ||
689 | /* Nothing to do if running in dom0. */ | |
6e833587 | 690 | if (xen_initial_domain()) |
4ee36dc0 MA |
691 | return -ENODEV; |
692 | ||
ffb78a26 | 693 | return xenbus_register_frontend(&xenfb_driver); |
4ee36dc0 MA |
694 | } |
695 | ||
696 | static void __exit xenfb_cleanup(void) | |
697 | { | |
ffb78a26 | 698 | xenbus_unregister_driver(&xenfb_driver); |
4ee36dc0 MA |
699 | } |
700 | ||
701 | module_init(xenfb_init); | |
702 | module_exit(xenfb_cleanup); | |
703 | ||
1e892c95 | 704 | MODULE_DESCRIPTION("Xen virtual framebuffer device frontend"); |
4ee36dc0 | 705 | MODULE_LICENSE("GPL"); |
1e892c95 | 706 | MODULE_ALIAS("xen:vfb"); |