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