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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> | |
51c71a3b | 38 | #include <xen/platform_pci.h> |
4ee36dc0 MA |
39 | |
40 | struct xenfb_info { | |
41 | unsigned char *fb; | |
42 | struct fb_info *fb_info; | |
43 | int x1, y1, x2, y2; /* dirty rectangle, | |
44 | protected by dirty_lock */ | |
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; /* XENFB_TYPE_UPDATE wanted */ | |
e4dcff1f MA |
51 | int feature_resize; /* XENFB_TYPE_RESIZE ok */ |
52 | struct xenfb_resize resize; /* protected by resize_lock */ | |
53 | int resize_dpy; /* ditto */ | |
54 | spinlock_t resize_lock; | |
4ee36dc0 MA |
55 | |
56 | struct xenbus_device *xbdev; | |
57 | }; | |
58 | ||
e4dcff1f MA |
59 | #define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8) |
60 | ||
61 | enum { KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT }; | |
62 | static int video[KPARAM_CNT] = { 2, XENFB_WIDTH, XENFB_HEIGHT }; | |
63 | module_param_array(video, int, NULL, 0); | |
64 | MODULE_PARM_DESC(video, | |
65 | "Video memory size in MB, width, height in pixels (default 2,800,600)"); | |
4ee36dc0 | 66 | |
9e124fe1 | 67 | static void xenfb_make_preferred_console(void); |
4ee36dc0 | 68 | static int xenfb_remove(struct xenbus_device *); |
e4dcff1f | 69 | static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *); |
4ee36dc0 MA |
70 | static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *); |
71 | static void xenfb_disconnect_backend(struct xenfb_info *); | |
72 | ||
e4dcff1f MA |
73 | static 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 | /* caller ensures !xenfb_queue_full() */ | |
80 | mb(); /* ensure ring space available */ | |
81 | XENFB_OUT_RING_REF(info->page, prod) = *event; | |
82 | wmb(); /* ensure ring contents visible */ | |
83 | info->page->out_prod = prod + 1; | |
84 | ||
85 | notify_remote_via_irq(info->irq); | |
86 | } | |
87 | ||
4ee36dc0 MA |
88 | static void xenfb_do_update(struct xenfb_info *info, |
89 | int x, int y, int w, int h) | |
90 | { | |
91 | union xenfb_out_event event; | |
4ee36dc0 | 92 | |
f4ad1ebd | 93 | memset(&event, 0, sizeof(event)); |
4ee36dc0 MA |
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 | ||
4ee36dc0 | 100 | /* caller ensures !xenfb_queue_full() */ |
e4dcff1f MA |
101 | xenfb_send_event(info, &event); |
102 | } | |
4ee36dc0 | 103 | |
e4dcff1f MA |
104 | static 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 | /* caller ensures !xenfb_queue_full() */ | |
112 | xenfb_send_event(info, &event); | |
4ee36dc0 MA |
113 | } |
114 | ||
115 | static 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 | ||
e4dcff1f MA |
124 | static 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 | ||
4ee36dc0 MA |
138 | static void xenfb_refresh(struct xenfb_info *info, |
139 | int x1, int y1, int w, int h) | |
140 | { | |
141 | unsigned long flags; | |
4ee36dc0 | 142 | int x2 = x1 + w - 1; |
e4dcff1f MA |
143 | int y2 = y1 + h - 1; |
144 | ||
145 | xenfb_handle_resize_dpy(info); | |
4ee36dc0 MA |
146 | |
147 | if (!info->update_wanted) | |
148 | return; | |
149 | ||
150 | spin_lock_irqsave(&info->dirty_lock, flags); | |
151 | ||
152 | /* Combine with dirty rectangle: */ | |
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 | /* Can't send right now, stash it in the dirty rectangle */ | |
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 | /* Clear dirty rectangle: */ | |
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 | ||
182 | static 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 | ||
207 | static struct fb_deferred_io xenfb_defio = { | |
208 | .delay = HZ / 20, | |
209 | .deferred_io = xenfb_deferred_io, | |
210 | }; | |
211 | ||
212 | static 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 | ||
243 | static 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 | ||
251 | static 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 | ||
259 | static 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 | ||
267 | static 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 | ||
e4dcff1f MA |
278 | static int |
279 | xenfb_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 | /* Can't resize past initial width and height */ | |
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 | ||
310 | static 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 | ||
4ee36dc0 MA |
329 | static 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, | |
e4dcff1f MA |
337 | .fb_check_var = xenfb_check_var, |
338 | .fb_set_par = xenfb_set_par, | |
4ee36dc0 MA |
339 | }; |
340 | ||
341 | static irqreturn_t xenfb_event_handler(int rq, void *dev_id) | |
342 | { | |
343 | /* | |
344 | * No in events recognized, simply ignore them all. | |
345 | * If you need to recognize some, see xen-kbdfront's | |
346 | * input_handler() for how to do that. | |
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 | /* Flush dirty rectangle: */ | |
357 | xenfb_refresh(info, INT_MAX, INT_MAX, -INT_MAX, -INT_MAX); | |
358 | ||
359 | return IRQ_HANDLED; | |
360 | } | |
361 | ||
48c68c4f GKH |
362 | static int xenfb_probe(struct xenbus_device *dev, |
363 | const struct xenbus_device_id *id) | |
4ee36dc0 MA |
364 | { |
365 | struct xenfb_info *info; | |
366 | struct fb_info *fb_info; | |
e4dcff1f MA |
367 | int fb_size; |
368 | int val; | |
a7a97c63 | 369 | int ret = 0; |
4ee36dc0 MA |
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 | } | |
e4dcff1f MA |
376 | |
377 | /* Limit kernel param videoram amount to what is in xenstore */ | |
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 | /* If requested res does not fit in available memory, use default */ | |
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 | ||
1b713e00 | 392 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
393 | info->xbdev = dev; |
394 | info->irq = -1; | |
395 | info->x1 = info->y1 = INT_MAX; | |
396 | spin_lock_init(&info->dirty_lock); | |
e4dcff1f | 397 | spin_lock_init(&info->resize_lock); |
4ee36dc0 | 398 | |
1b86d775 | 399 | info->fb = vzalloc(fb_size); |
4ee36dc0 MA |
400 | if (info->fb == NULL) |
401 | goto error_nomem; | |
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 | 461 | ret = xenfb_connect_backend(dev, info); |
a7a97c63 JL |
462 | if (ret < 0) { |
463 | xenbus_dev_fatal(dev, ret, "xenfb_connect_backend"); | |
464 | goto error_fb; | |
465 | } | |
0a80fb10 | 466 | |
4ee36dc0 MA |
467 | ret = register_framebuffer(fb_info); |
468 | if (ret) { | |
4ee36dc0 | 469 | xenbus_dev_fatal(dev, ret, "register_framebuffer"); |
a7a97c63 | 470 | goto error_fb; |
4ee36dc0 MA |
471 | } |
472 | info->fb_info = fb_info; | |
473 | ||
9e124fe1 | 474 | xenfb_make_preferred_console(); |
4ee36dc0 MA |
475 | return 0; |
476 | ||
a7a97c63 JL |
477 | error_fb: |
478 | fb_deferred_io_cleanup(fb_info); | |
479 | fb_dealloc_cmap(&fb_info->cmap); | |
480 | framebuffer_release(fb_info); | |
481 | error_nomem: | |
482 | if (!ret) { | |
483 | ret = -ENOMEM; | |
484 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
485 | } | |
486 | error: | |
4ee36dc0 MA |
487 | xenfb_remove(dev); |
488 | return ret; | |
489 | } | |
490 | ||
48c68c4f | 491 | static void xenfb_make_preferred_console(void) |
9e124fe1 MA |
492 | { |
493 | struct console *c; | |
494 | ||
495 | if (console_set_on_cmdline) | |
496 | return; | |
497 | ||
ac751efa | 498 | console_lock(); |
281e6605 | 499 | for_each_console(c) { |
9e124fe1 MA |
500 | if (!strcmp(c->name, "tty") && c->index == 0) |
501 | break; | |
502 | } | |
ac751efa | 503 | console_unlock(); |
9e124fe1 MA |
504 | if (c) { |
505 | unregister_console(c); | |
506 | c->flags |= CON_CONSDEV; | |
507 | c->flags &= ~CON_PRINTBUFFER; /* don't print again */ | |
508 | register_console(c); | |
509 | } | |
510 | } | |
511 | ||
4ee36dc0 MA |
512 | static int xenfb_resume(struct xenbus_device *dev) |
513 | { | |
1b713e00 | 514 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
515 | |
516 | xenfb_disconnect_backend(info); | |
e4dcff1f | 517 | xenfb_init_shared_page(info, info->fb_info); |
4ee36dc0 MA |
518 | return xenfb_connect_backend(dev, info); |
519 | } | |
520 | ||
521 | static int xenfb_remove(struct xenbus_device *dev) | |
522 | { | |
1b713e00 | 523 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
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 | ||
540 | static unsigned long vmalloc_to_mfn(void *address) | |
541 | { | |
542 | return pfn_to_mfn(vmalloc_to_pfn(address)); | |
543 | } | |
544 | ||
e4dcff1f MA |
545 | static void xenfb_init_shared_page(struct xenfb_info *info, |
546 | struct fb_info *fb_info) | |
4ee36dc0 MA |
547 | { |
548 | int i; | |
e4dcff1f | 549 | int epd = PAGE_SIZE / sizeof(info->mfns[0]); |
4ee36dc0 MA |
550 | |
551 | for (i = 0; i < info->nr_pages; i++) | |
552 | info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE); | |
553 | ||
e4dcff1f MA |
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; | |
4ee36dc0 MA |
562 | info->page->in_cons = info->page->in_prod = 0; |
563 | info->page->out_cons = info->page->out_prod = 0; | |
564 | } | |
565 | ||
566 | static int xenfb_connect_backend(struct xenbus_device *dev, | |
567 | struct xenfb_info *info) | |
568 | { | |
fc550e95 | 569 | int ret, evtchn, irq; |
4ee36dc0 MA |
570 | struct xenbus_transaction xbt; |
571 | ||
572 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
573 | if (ret) | |
574 | return ret; | |
fc550e95 | 575 | irq = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, |
4ee36dc0 | 576 | 0, dev->devicetype, info); |
fc550e95 | 577 | if (irq < 0) { |
4ee36dc0 MA |
578 | xenbus_free_evtchn(dev, evtchn); |
579 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
fc550e95 | 580 | return irq; |
4ee36dc0 | 581 | } |
4ee36dc0 MA |
582 | again: |
583 | ret = xenbus_transaction_start(&xbt); | |
584 | if (ret) { | |
585 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
fc550e95 | 586 | goto unbind_irq; |
4ee36dc0 MA |
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"); | |
fc550e95 | 608 | goto unbind_irq; |
4ee36dc0 MA |
609 | } |
610 | ||
611 | xenbus_switch_state(dev, XenbusStateInitialised); | |
fc550e95 | 612 | info->irq = irq; |
4ee36dc0 MA |
613 | return 0; |
614 | ||
615 | error_xenbus: | |
616 | xenbus_transaction_end(xbt, 1); | |
617 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
fc550e95 JJ |
618 | unbind_irq: |
619 | unbind_from_irqhandler(irq, info); | |
4ee36dc0 MA |
620 | return ret; |
621 | } | |
622 | ||
623 | static void xenfb_disconnect_backend(struct xenfb_info *info) | |
624 | { | |
731f3ab6 JJ |
625 | /* Prevent xenfb refresh */ |
626 | info->update_wanted = 0; | |
4ee36dc0 MA |
627 | if (info->irq >= 0) |
628 | unbind_from_irqhandler(info->irq, info); | |
629 | info->irq = -1; | |
630 | } | |
631 | ||
632 | static void xenfb_backend_changed(struct xenbus_device *dev, | |
633 | enum xenbus_state backend_state) | |
634 | { | |
1b713e00 | 635 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
636 | int val; |
637 | ||
638 | switch (backend_state) { | |
639 | case XenbusStateInitialising: | |
640 | case XenbusStateInitialised: | |
b78c9512 NI |
641 | case XenbusStateReconfiguring: |
642 | case XenbusStateReconfigured: | |
4ee36dc0 | 643 | case XenbusStateUnknown: |
4ee36dc0 MA |
644 | break; |
645 | ||
646 | case XenbusStateInitWait: | |
647 | InitWait: | |
648 | xenbus_switch_state(dev, XenbusStateConnected); | |
649 | break; | |
650 | ||
651 | case XenbusStateConnected: | |
652 | /* | |
653 | * Work around xenbus race condition: If backend goes | |
654 | * through InitWait to Connected fast enough, we can | |
655 | * get Connected twice here. | |
656 | */ | |
657 | if (dev->state != XenbusStateConnected) | |
658 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
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; | |
e4dcff1f MA |
665 | |
666 | if (xenbus_scanf(XBT_NIL, dev->otherend, | |
667 | "feature-resize", "%d", &val) < 0) | |
668 | val = 0; | |
669 | info->feature_resize = val; | |
4ee36dc0 MA |
670 | break; |
671 | ||
01bc825f DV |
672 | case XenbusStateClosed: |
673 | if (dev->state == XenbusStateClosed) | |
674 | break; | |
675 | /* Missed the backend's CLOSING state -- fallthrough */ | |
4ee36dc0 MA |
676 | case XenbusStateClosing: |
677 | xenbus_frontend_closed(dev); | |
678 | break; | |
679 | } | |
680 | } | |
681 | ||
73db144b | 682 | static const struct xenbus_device_id xenfb_ids[] = { |
4ee36dc0 MA |
683 | { "vfb" }, |
684 | { "" } | |
685 | }; | |
686 | ||
95afae48 DV |
687 | static struct xenbus_driver xenfb_driver = { |
688 | .ids = xenfb_ids, | |
4ee36dc0 MA |
689 | .probe = xenfb_probe, |
690 | .remove = xenfb_remove, | |
691 | .resume = xenfb_resume, | |
692 | .otherend_changed = xenfb_backend_changed, | |
95afae48 | 693 | }; |
4ee36dc0 MA |
694 | |
695 | static int __init xenfb_init(void) | |
696 | { | |
b1a3b1c8 | 697 | if (!xen_domain()) |
4ee36dc0 MA |
698 | return -ENODEV; |
699 | ||
700 | /* Nothing to do if running in dom0. */ | |
6e833587 | 701 | if (xen_initial_domain()) |
4ee36dc0 MA |
702 | return -ENODEV; |
703 | ||
51c71a3b KRW |
704 | if (!xen_has_pv_devices()) |
705 | return -ENODEV; | |
706 | ||
ffb78a26 | 707 | return xenbus_register_frontend(&xenfb_driver); |
4ee36dc0 MA |
708 | } |
709 | ||
710 | static void __exit xenfb_cleanup(void) | |
711 | { | |
ffb78a26 | 712 | xenbus_unregister_driver(&xenfb_driver); |
4ee36dc0 MA |
713 | } |
714 | ||
715 | module_init(xenfb_init); | |
716 | module_exit(xenfb_cleanup); | |
717 | ||
1e892c95 | 718 | MODULE_DESCRIPTION("Xen virtual framebuffer device frontend"); |
4ee36dc0 | 719 | MODULE_LICENSE("GPL"); |
1e892c95 | 720 | MODULE_ALIAS("xen:vfb"); |