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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
4ee36dc0 MA |
27 | #include <linux/vmalloc.h> |
28 | #include <linux/mm.h> | |
1ccbf534 | 29 | |
4ee36dc0 | 30 | #include <asm/xen/hypervisor.h> |
1ccbf534 JF |
31 | |
32 | #include <xen/xen.h> | |
4ee36dc0 MA |
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 | ||
39 | struct xenfb_info { | |
40 | unsigned char *fb; | |
41 | struct fb_info *fb_info; | |
42 | int x1, y1, x2, y2; /* dirty rectangle, | |
43 | protected by dirty_lock */ | |
44 | spinlock_t dirty_lock; | |
45 | int nr_pages; | |
46 | int irq; | |
47 | struct xenfb_page *page; | |
48 | unsigned long *mfns; | |
49 | int update_wanted; /* XENFB_TYPE_UPDATE wanted */ | |
e4dcff1f MA |
50 | int feature_resize; /* XENFB_TYPE_RESIZE ok */ |
51 | struct xenfb_resize resize; /* protected by resize_lock */ | |
52 | int resize_dpy; /* ditto */ | |
53 | spinlock_t resize_lock; | |
4ee36dc0 MA |
54 | |
55 | struct xenbus_device *xbdev; | |
56 | }; | |
57 | ||
e4dcff1f MA |
58 | #define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8) |
59 | ||
60 | enum { KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT }; | |
61 | static int video[KPARAM_CNT] = { 2, XENFB_WIDTH, XENFB_HEIGHT }; | |
62 | module_param_array(video, int, NULL, 0); | |
63 | MODULE_PARM_DESC(video, | |
64 | "Video memory size in MB, width, height in pixels (default 2,800,600)"); | |
4ee36dc0 | 65 | |
9e124fe1 | 66 | static void xenfb_make_preferred_console(void); |
4ee36dc0 | 67 | static int xenfb_remove(struct xenbus_device *); |
e4dcff1f | 68 | static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *); |
4ee36dc0 MA |
69 | static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *); |
70 | static void xenfb_disconnect_backend(struct xenfb_info *); | |
71 | ||
e4dcff1f MA |
72 | static void xenfb_send_event(struct xenfb_info *info, |
73 | union xenfb_out_event *event) | |
74 | { | |
75 | u32 prod; | |
76 | ||
77 | prod = info->page->out_prod; | |
78 | /* caller ensures !xenfb_queue_full() */ | |
79 | mb(); /* ensure ring space available */ | |
80 | XENFB_OUT_RING_REF(info->page, prod) = *event; | |
81 | wmb(); /* ensure ring contents visible */ | |
82 | info->page->out_prod = prod + 1; | |
83 | ||
84 | notify_remote_via_irq(info->irq); | |
85 | } | |
86 | ||
4ee36dc0 MA |
87 | static void xenfb_do_update(struct xenfb_info *info, |
88 | int x, int y, int w, int h) | |
89 | { | |
90 | union xenfb_out_event event; | |
4ee36dc0 | 91 | |
f4ad1ebd | 92 | memset(&event, 0, sizeof(event)); |
4ee36dc0 MA |
93 | event.type = XENFB_TYPE_UPDATE; |
94 | event.update.x = x; | |
95 | event.update.y = y; | |
96 | event.update.width = w; | |
97 | event.update.height = h; | |
98 | ||
4ee36dc0 | 99 | /* caller ensures !xenfb_queue_full() */ |
e4dcff1f MA |
100 | xenfb_send_event(info, &event); |
101 | } | |
4ee36dc0 | 102 | |
e4dcff1f MA |
103 | static void xenfb_do_resize(struct xenfb_info *info) |
104 | { | |
105 | union xenfb_out_event event; | |
106 | ||
107 | memset(&event, 0, sizeof(event)); | |
108 | event.resize = info->resize; | |
109 | ||
110 | /* caller ensures !xenfb_queue_full() */ | |
111 | xenfb_send_event(info, &event); | |
4ee36dc0 MA |
112 | } |
113 | ||
114 | static int xenfb_queue_full(struct xenfb_info *info) | |
115 | { | |
116 | u32 cons, prod; | |
117 | ||
118 | prod = info->page->out_prod; | |
119 | cons = info->page->out_cons; | |
120 | return prod - cons == XENFB_OUT_RING_LEN; | |
121 | } | |
122 | ||
e4dcff1f MA |
123 | static void xenfb_handle_resize_dpy(struct xenfb_info *info) |
124 | { | |
125 | unsigned long flags; | |
126 | ||
127 | spin_lock_irqsave(&info->resize_lock, flags); | |
128 | if (info->resize_dpy) { | |
129 | if (!xenfb_queue_full(info)) { | |
130 | info->resize_dpy = 0; | |
131 | xenfb_do_resize(info); | |
132 | } | |
133 | } | |
134 | spin_unlock_irqrestore(&info->resize_lock, flags); | |
135 | } | |
136 | ||
4ee36dc0 MA |
137 | static void xenfb_refresh(struct xenfb_info *info, |
138 | int x1, int y1, int w, int h) | |
139 | { | |
140 | unsigned long flags; | |
4ee36dc0 | 141 | int x2 = x1 + w - 1; |
e4dcff1f MA |
142 | int y2 = y1 + h - 1; |
143 | ||
144 | xenfb_handle_resize_dpy(info); | |
4ee36dc0 MA |
145 | |
146 | if (!info->update_wanted) | |
147 | return; | |
148 | ||
149 | spin_lock_irqsave(&info->dirty_lock, flags); | |
150 | ||
151 | /* Combine with dirty rectangle: */ | |
152 | if (info->y1 < y1) | |
153 | y1 = info->y1; | |
154 | if (info->y2 > y2) | |
155 | y2 = info->y2; | |
156 | if (info->x1 < x1) | |
157 | x1 = info->x1; | |
158 | if (info->x2 > x2) | |
159 | x2 = info->x2; | |
160 | ||
161 | if (xenfb_queue_full(info)) { | |
162 | /* Can't send right now, stash it in the dirty rectangle */ | |
163 | info->x1 = x1; | |
164 | info->x2 = x2; | |
165 | info->y1 = y1; | |
166 | info->y2 = y2; | |
167 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
168 | return; | |
169 | } | |
170 | ||
171 | /* Clear dirty rectangle: */ | |
172 | info->x1 = info->y1 = INT_MAX; | |
173 | info->x2 = info->y2 = 0; | |
174 | ||
175 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
176 | ||
177 | if (x1 <= x2 && y1 <= y2) | |
178 | xenfb_do_update(info, x1, y1, x2 - x1 + 1, y2 - y1 + 1); | |
179 | } | |
180 | ||
181 | static void xenfb_deferred_io(struct fb_info *fb_info, | |
182 | struct list_head *pagelist) | |
183 | { | |
184 | struct xenfb_info *info = fb_info->par; | |
185 | struct page *page; | |
186 | unsigned long beg, end; | |
187 | int y1, y2, miny, maxy; | |
188 | ||
189 | miny = INT_MAX; | |
190 | maxy = 0; | |
191 | list_for_each_entry(page, pagelist, lru) { | |
192 | beg = page->index << PAGE_SHIFT; | |
193 | end = beg + PAGE_SIZE - 1; | |
194 | y1 = beg / fb_info->fix.line_length; | |
195 | y2 = end / fb_info->fix.line_length; | |
196 | if (y2 >= fb_info->var.yres) | |
197 | y2 = fb_info->var.yres - 1; | |
198 | if (miny > y1) | |
199 | miny = y1; | |
200 | if (maxy < y2) | |
201 | maxy = y2; | |
202 | } | |
203 | xenfb_refresh(info, 0, miny, fb_info->var.xres, maxy - miny + 1); | |
204 | } | |
205 | ||
206 | static struct fb_deferred_io xenfb_defio = { | |
207 | .delay = HZ / 20, | |
208 | .deferred_io = xenfb_deferred_io, | |
209 | }; | |
210 | ||
211 | static int xenfb_setcolreg(unsigned regno, unsigned red, unsigned green, | |
212 | unsigned blue, unsigned transp, | |
213 | struct fb_info *info) | |
214 | { | |
215 | u32 v; | |
216 | ||
217 | if (regno > info->cmap.len) | |
218 | return 1; | |
219 | ||
220 | #define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16) | |
221 | red = CNVT_TOHW(red, info->var.red.length); | |
222 | green = CNVT_TOHW(green, info->var.green.length); | |
223 | blue = CNVT_TOHW(blue, info->var.blue.length); | |
224 | transp = CNVT_TOHW(transp, info->var.transp.length); | |
225 | #undef CNVT_TOHW | |
226 | ||
227 | v = (red << info->var.red.offset) | | |
228 | (green << info->var.green.offset) | | |
229 | (blue << info->var.blue.offset); | |
230 | ||
231 | switch (info->var.bits_per_pixel) { | |
232 | case 16: | |
233 | case 24: | |
234 | case 32: | |
235 | ((u32 *)info->pseudo_palette)[regno] = v; | |
236 | break; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static void xenfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect) | |
243 | { | |
244 | struct xenfb_info *info = p->par; | |
245 | ||
246 | sys_fillrect(p, rect); | |
247 | xenfb_refresh(info, rect->dx, rect->dy, rect->width, rect->height); | |
248 | } | |
249 | ||
250 | static void xenfb_imageblit(struct fb_info *p, const struct fb_image *image) | |
251 | { | |
252 | struct xenfb_info *info = p->par; | |
253 | ||
254 | sys_imageblit(p, image); | |
255 | xenfb_refresh(info, image->dx, image->dy, image->width, image->height); | |
256 | } | |
257 | ||
258 | static void xenfb_copyarea(struct fb_info *p, const struct fb_copyarea *area) | |
259 | { | |
260 | struct xenfb_info *info = p->par; | |
261 | ||
262 | sys_copyarea(p, area); | |
263 | xenfb_refresh(info, area->dx, area->dy, area->width, area->height); | |
264 | } | |
265 | ||
266 | static ssize_t xenfb_write(struct fb_info *p, const char __user *buf, | |
267 | size_t count, loff_t *ppos) | |
268 | { | |
269 | struct xenfb_info *info = p->par; | |
270 | ssize_t res; | |
271 | ||
272 | res = fb_sys_write(p, buf, count, ppos); | |
273 | xenfb_refresh(info, 0, 0, info->page->width, info->page->height); | |
274 | return res; | |
275 | } | |
276 | ||
e4dcff1f MA |
277 | static int |
278 | xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
279 | { | |
280 | struct xenfb_info *xenfb_info; | |
281 | int required_mem_len; | |
282 | ||
283 | xenfb_info = info->par; | |
284 | ||
285 | if (!xenfb_info->feature_resize) { | |
286 | if (var->xres == video[KPARAM_WIDTH] && | |
287 | var->yres == video[KPARAM_HEIGHT] && | |
288 | var->bits_per_pixel == xenfb_info->page->depth) { | |
289 | return 0; | |
290 | } | |
291 | return -EINVAL; | |
292 | } | |
293 | ||
294 | /* Can't resize past initial width and height */ | |
295 | if (var->xres > video[KPARAM_WIDTH] || var->yres > video[KPARAM_HEIGHT]) | |
296 | return -EINVAL; | |
297 | ||
298 | required_mem_len = var->xres * var->yres * xenfb_info->page->depth / 8; | |
299 | if (var->bits_per_pixel == xenfb_info->page->depth && | |
300 | var->xres <= info->fix.line_length / (XENFB_DEPTH / 8) && | |
301 | required_mem_len <= info->fix.smem_len) { | |
302 | var->xres_virtual = var->xres; | |
303 | var->yres_virtual = var->yres; | |
304 | return 0; | |
305 | } | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | static int xenfb_set_par(struct fb_info *info) | |
310 | { | |
311 | struct xenfb_info *xenfb_info; | |
312 | unsigned long flags; | |
313 | ||
314 | xenfb_info = info->par; | |
315 | ||
316 | spin_lock_irqsave(&xenfb_info->resize_lock, flags); | |
317 | xenfb_info->resize.type = XENFB_TYPE_RESIZE; | |
318 | xenfb_info->resize.width = info->var.xres; | |
319 | xenfb_info->resize.height = info->var.yres; | |
320 | xenfb_info->resize.stride = info->fix.line_length; | |
321 | xenfb_info->resize.depth = info->var.bits_per_pixel; | |
322 | xenfb_info->resize.offset = 0; | |
323 | xenfb_info->resize_dpy = 1; | |
324 | spin_unlock_irqrestore(&xenfb_info->resize_lock, flags); | |
325 | return 0; | |
326 | } | |
327 | ||
4ee36dc0 MA |
328 | static struct fb_ops xenfb_fb_ops = { |
329 | .owner = THIS_MODULE, | |
330 | .fb_read = fb_sys_read, | |
331 | .fb_write = xenfb_write, | |
332 | .fb_setcolreg = xenfb_setcolreg, | |
333 | .fb_fillrect = xenfb_fillrect, | |
334 | .fb_copyarea = xenfb_copyarea, | |
335 | .fb_imageblit = xenfb_imageblit, | |
e4dcff1f MA |
336 | .fb_check_var = xenfb_check_var, |
337 | .fb_set_par = xenfb_set_par, | |
4ee36dc0 MA |
338 | }; |
339 | ||
340 | static irqreturn_t xenfb_event_handler(int rq, void *dev_id) | |
341 | { | |
342 | /* | |
343 | * No in events recognized, simply ignore them all. | |
344 | * If you need to recognize some, see xen-kbdfront's | |
345 | * input_handler() for how to do that. | |
346 | */ | |
347 | struct xenfb_info *info = dev_id; | |
348 | struct xenfb_page *page = info->page; | |
349 | ||
350 | if (page->in_cons != page->in_prod) { | |
351 | info->page->in_cons = info->page->in_prod; | |
352 | notify_remote_via_irq(info->irq); | |
353 | } | |
354 | ||
355 | /* Flush dirty rectangle: */ | |
356 | xenfb_refresh(info, INT_MAX, INT_MAX, -INT_MAX, -INT_MAX); | |
357 | ||
358 | return IRQ_HANDLED; | |
359 | } | |
360 | ||
361 | static int __devinit xenfb_probe(struct xenbus_device *dev, | |
362 | const struct xenbus_device_id *id) | |
363 | { | |
364 | struct xenfb_info *info; | |
365 | struct fb_info *fb_info; | |
e4dcff1f MA |
366 | int fb_size; |
367 | int val; | |
4ee36dc0 MA |
368 | int ret; |
369 | ||
370 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
371 | if (info == NULL) { | |
372 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); | |
373 | return -ENOMEM; | |
374 | } | |
e4dcff1f MA |
375 | |
376 | /* Limit kernel param videoram amount to what is in xenstore */ | |
377 | if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) { | |
378 | if (val < video[KPARAM_MEM]) | |
379 | video[KPARAM_MEM] = val; | |
380 | } | |
381 | ||
382 | /* If requested res does not fit in available memory, use default */ | |
383 | fb_size = video[KPARAM_MEM] * 1024 * 1024; | |
384 | if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH / 8 | |
385 | > fb_size) { | |
386 | video[KPARAM_WIDTH] = XENFB_WIDTH; | |
387 | video[KPARAM_HEIGHT] = XENFB_HEIGHT; | |
388 | fb_size = XENFB_DEFAULT_FB_LEN; | |
389 | } | |
390 | ||
1b713e00 | 391 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
392 | info->xbdev = dev; |
393 | info->irq = -1; | |
394 | info->x1 = info->y1 = INT_MAX; | |
395 | spin_lock_init(&info->dirty_lock); | |
e4dcff1f | 396 | spin_lock_init(&info->resize_lock); |
4ee36dc0 | 397 | |
e4dcff1f | 398 | info->fb = vmalloc(fb_size); |
4ee36dc0 MA |
399 | if (info->fb == NULL) |
400 | goto error_nomem; | |
e4dcff1f | 401 | memset(info->fb, 0, fb_size); |
4ee36dc0 | 402 | |
e4dcff1f | 403 | info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4ee36dc0 MA |
404 | |
405 | info->mfns = vmalloc(sizeof(unsigned long) * info->nr_pages); | |
406 | if (!info->mfns) | |
407 | goto error_nomem; | |
408 | ||
409 | /* set up shared page */ | |
410 | info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
411 | if (!info->page) | |
412 | goto error_nomem; | |
413 | ||
4ee36dc0 MA |
414 | /* abusing framebuffer_alloc() to allocate pseudo_palette */ |
415 | fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL); | |
416 | if (fb_info == NULL) | |
417 | goto error_nomem; | |
418 | ||
419 | /* complete the abuse: */ | |
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; | |
e4dcff1f MA |
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; | |
4ee36dc0 MA |
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; | |
e4dcff1f | 440 | fb_info->fix.line_length = fb_info->var.xres * XENFB_DEPTH / 8; |
4ee36dc0 | 441 | fb_info->fix.smem_start = 0; |
e4dcff1f | 442 | fb_info->fix.smem_len = fb_size; |
4ee36dc0 MA |
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 | ||
df11303c | 447 | fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; |
4ee36dc0 MA |
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 | ||
e4dcff1f MA |
459 | xenfb_init_shared_page(info, fb_info); |
460 | ||
0a80fb10 JF |
461 | ret = xenfb_connect_backend(dev, info); |
462 | if (ret < 0) | |
463 | goto error; | |
464 | ||
4ee36dc0 MA |
465 | ret = register_framebuffer(fb_info); |
466 | if (ret) { | |
467 | fb_deferred_io_cleanup(fb_info); | |
468 | fb_dealloc_cmap(&fb_info->cmap); | |
469 | framebuffer_release(fb_info); | |
470 | xenbus_dev_fatal(dev, ret, "register_framebuffer"); | |
471 | goto error; | |
472 | } | |
473 | info->fb_info = fb_info; | |
474 | ||
9e124fe1 | 475 | xenfb_make_preferred_console(); |
4ee36dc0 MA |
476 | return 0; |
477 | ||
478 | error_nomem: | |
479 | ret = -ENOMEM; | |
480 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
481 | error: | |
482 | xenfb_remove(dev); | |
483 | return ret; | |
484 | } | |
485 | ||
9e124fe1 MA |
486 | static __devinit void |
487 | xenfb_make_preferred_console(void) | |
488 | { | |
489 | struct console *c; | |
490 | ||
491 | if (console_set_on_cmdline) | |
492 | return; | |
493 | ||
494 | acquire_console_sem(); | |
495 | for (c = console_drivers; c; c = c->next) { | |
496 | if (!strcmp(c->name, "tty") && c->index == 0) | |
497 | break; | |
498 | } | |
499 | release_console_sem(); | |
500 | if (c) { | |
501 | unregister_console(c); | |
502 | c->flags |= CON_CONSDEV; | |
503 | c->flags &= ~CON_PRINTBUFFER; /* don't print again */ | |
504 | register_console(c); | |
505 | } | |
506 | } | |
507 | ||
4ee36dc0 MA |
508 | static int xenfb_resume(struct xenbus_device *dev) |
509 | { | |
1b713e00 | 510 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
511 | |
512 | xenfb_disconnect_backend(info); | |
e4dcff1f | 513 | xenfb_init_shared_page(info, info->fb_info); |
4ee36dc0 MA |
514 | return xenfb_connect_backend(dev, info); |
515 | } | |
516 | ||
517 | static int xenfb_remove(struct xenbus_device *dev) | |
518 | { | |
1b713e00 | 519 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
520 | |
521 | xenfb_disconnect_backend(info); | |
522 | if (info->fb_info) { | |
523 | fb_deferred_io_cleanup(info->fb_info); | |
524 | unregister_framebuffer(info->fb_info); | |
525 | fb_dealloc_cmap(&info->fb_info->cmap); | |
526 | framebuffer_release(info->fb_info); | |
527 | } | |
528 | free_page((unsigned long)info->page); | |
529 | vfree(info->mfns); | |
530 | vfree(info->fb); | |
531 | kfree(info); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static unsigned long vmalloc_to_mfn(void *address) | |
537 | { | |
538 | return pfn_to_mfn(vmalloc_to_pfn(address)); | |
539 | } | |
540 | ||
e4dcff1f MA |
541 | static void xenfb_init_shared_page(struct xenfb_info *info, |
542 | struct fb_info *fb_info) | |
4ee36dc0 MA |
543 | { |
544 | int i; | |
e4dcff1f | 545 | int epd = PAGE_SIZE / sizeof(info->mfns[0]); |
4ee36dc0 MA |
546 | |
547 | for (i = 0; i < info->nr_pages; i++) | |
548 | info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE); | |
549 | ||
e4dcff1f MA |
550 | for (i = 0; i * epd < info->nr_pages; i++) |
551 | info->page->pd[i] = vmalloc_to_mfn(&info->mfns[i * epd]); | |
552 | ||
553 | info->page->width = fb_info->var.xres; | |
554 | info->page->height = fb_info->var.yres; | |
555 | info->page->depth = fb_info->var.bits_per_pixel; | |
556 | info->page->line_length = fb_info->fix.line_length; | |
557 | info->page->mem_length = fb_info->fix.smem_len; | |
4ee36dc0 MA |
558 | info->page->in_cons = info->page->in_prod = 0; |
559 | info->page->out_cons = info->page->out_prod = 0; | |
560 | } | |
561 | ||
562 | static int xenfb_connect_backend(struct xenbus_device *dev, | |
563 | struct xenfb_info *info) | |
564 | { | |
565 | int ret, evtchn; | |
566 | struct xenbus_transaction xbt; | |
567 | ||
568 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
569 | if (ret) | |
570 | return ret; | |
571 | ret = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, | |
572 | 0, dev->devicetype, info); | |
573 | if (ret < 0) { | |
574 | xenbus_free_evtchn(dev, evtchn); | |
575 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
576 | return ret; | |
577 | } | |
578 | info->irq = ret; | |
579 | ||
580 | again: | |
581 | ret = xenbus_transaction_start(&xbt); | |
582 | if (ret) { | |
583 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
584 | return ret; | |
585 | } | |
586 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
587 | virt_to_mfn(info->page)); | |
588 | if (ret) | |
589 | goto error_xenbus; | |
590 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
591 | evtchn); | |
592 | if (ret) | |
593 | goto error_xenbus; | |
594 | ret = xenbus_printf(xbt, dev->nodename, "protocol", "%s", | |
595 | XEN_IO_PROTO_ABI_NATIVE); | |
596 | if (ret) | |
597 | goto error_xenbus; | |
598 | ret = xenbus_printf(xbt, dev->nodename, "feature-update", "1"); | |
599 | if (ret) | |
600 | goto error_xenbus; | |
601 | ret = xenbus_transaction_end(xbt, 0); | |
602 | if (ret) { | |
603 | if (ret == -EAGAIN) | |
604 | goto again; | |
605 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
606 | return ret; | |
607 | } | |
608 | ||
609 | xenbus_switch_state(dev, XenbusStateInitialised); | |
610 | return 0; | |
611 | ||
612 | error_xenbus: | |
613 | xenbus_transaction_end(xbt, 1); | |
614 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
615 | return ret; | |
616 | } | |
617 | ||
618 | static void xenfb_disconnect_backend(struct xenfb_info *info) | |
619 | { | |
620 | if (info->irq >= 0) | |
621 | unbind_from_irqhandler(info->irq, info); | |
622 | info->irq = -1; | |
623 | } | |
624 | ||
625 | static void xenfb_backend_changed(struct xenbus_device *dev, | |
626 | enum xenbus_state backend_state) | |
627 | { | |
1b713e00 | 628 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
629 | int val; |
630 | ||
631 | switch (backend_state) { | |
632 | case XenbusStateInitialising: | |
633 | case XenbusStateInitialised: | |
634 | case XenbusStateUnknown: | |
635 | case XenbusStateClosed: | |
636 | break; | |
637 | ||
638 | case XenbusStateInitWait: | |
639 | InitWait: | |
640 | xenbus_switch_state(dev, XenbusStateConnected); | |
641 | break; | |
642 | ||
643 | case XenbusStateConnected: | |
644 | /* | |
645 | * Work around xenbus race condition: If backend goes | |
646 | * through InitWait to Connected fast enough, we can | |
647 | * get Connected twice here. | |
648 | */ | |
649 | if (dev->state != XenbusStateConnected) | |
650 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
651 | ||
652 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
653 | "request-update", "%d", &val) < 0) | |
654 | val = 0; | |
655 | if (val) | |
656 | info->update_wanted = 1; | |
e4dcff1f MA |
657 | |
658 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
659 | "feature-resize", "%d", &val) < 0) | |
660 | val = 0; | |
661 | info->feature_resize = val; | |
4ee36dc0 MA |
662 | break; |
663 | ||
664 | case XenbusStateClosing: | |
665 | xenbus_frontend_closed(dev); | |
666 | break; | |
667 | } | |
668 | } | |
669 | ||
670 | static struct xenbus_device_id xenfb_ids[] = { | |
671 | { "vfb" }, | |
672 | { "" } | |
673 | }; | |
674 | ||
ffb78a26 | 675 | static struct xenbus_driver xenfb_driver = { |
4ee36dc0 MA |
676 | .name = "vfb", |
677 | .owner = THIS_MODULE, | |
678 | .ids = xenfb_ids, | |
679 | .probe = xenfb_probe, | |
680 | .remove = xenfb_remove, | |
681 | .resume = xenfb_resume, | |
682 | .otherend_changed = xenfb_backend_changed, | |
683 | }; | |
684 | ||
685 | static int __init xenfb_init(void) | |
686 | { | |
6e833587 | 687 | if (!xen_domain()) |
4ee36dc0 MA |
688 | return -ENODEV; |
689 | ||
690 | /* Nothing to do if running in dom0. */ | |
6e833587 | 691 | if (xen_initial_domain()) |
4ee36dc0 MA |
692 | return -ENODEV; |
693 | ||
ffb78a26 | 694 | return xenbus_register_frontend(&xenfb_driver); |
4ee36dc0 MA |
695 | } |
696 | ||
697 | static void __exit xenfb_cleanup(void) | |
698 | { | |
ffb78a26 | 699 | xenbus_unregister_driver(&xenfb_driver); |
4ee36dc0 MA |
700 | } |
701 | ||
702 | module_init(xenfb_init); | |
703 | module_exit(xenfb_cleanup); | |
704 | ||
1e892c95 | 705 | MODULE_DESCRIPTION("Xen virtual framebuffer device frontend"); |
4ee36dc0 | 706 | MODULE_LICENSE("GPL"); |
1e892c95 | 707 | MODULE_ALIAS("xen:vfb"); |