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 | ||
5a93db42 JG |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
9e124fe1 | 23 | #include <linux/console.h> |
4ee36dc0 MA |
24 | #include <linux/kernel.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/fb.h> | |
27 | #include <linux/module.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
4ee36dc0 MA |
29 | #include <linux/vmalloc.h> |
30 | #include <linux/mm.h> | |
1ccbf534 | 31 | |
4ee36dc0 | 32 | #include <asm/xen/hypervisor.h> |
1ccbf534 JF |
33 | |
34 | #include <xen/xen.h> | |
4ee36dc0 MA |
35 | #include <xen/events.h> |
36 | #include <xen/page.h> | |
37 | #include <xen/interface/io/fbif.h> | |
38 | #include <xen/interface/io/protocols.h> | |
39 | #include <xen/xenbus.h> | |
51c71a3b | 40 | #include <xen/platform_pci.h> |
4ee36dc0 MA |
41 | |
42 | struct xenfb_info { | |
43 | unsigned char *fb; | |
44 | struct fb_info *fb_info; | |
45 | int x1, y1, x2, y2; /* dirty rectangle, | |
46 | protected by dirty_lock */ | |
47 | spinlock_t dirty_lock; | |
48 | int nr_pages; | |
49 | int irq; | |
50 | struct xenfb_page *page; | |
0467533a | 51 | unsigned long *gfns; |
4ee36dc0 | 52 | int update_wanted; /* XENFB_TYPE_UPDATE wanted */ |
e4dcff1f MA |
53 | int feature_resize; /* XENFB_TYPE_RESIZE ok */ |
54 | struct xenfb_resize resize; /* protected by resize_lock */ | |
55 | int resize_dpy; /* ditto */ | |
56 | spinlock_t resize_lock; | |
4ee36dc0 MA |
57 | |
58 | struct xenbus_device *xbdev; | |
59 | }; | |
60 | ||
e4dcff1f MA |
61 | #define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8) |
62 | ||
63 | enum { KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT }; | |
64 | static int video[KPARAM_CNT] = { 2, XENFB_WIDTH, XENFB_HEIGHT }; | |
65 | module_param_array(video, int, NULL, 0); | |
66 | MODULE_PARM_DESC(video, | |
67 | "Video memory size in MB, width, height in pixels (default 2,800,600)"); | |
4ee36dc0 | 68 | |
9e124fe1 | 69 | static void xenfb_make_preferred_console(void); |
4ee36dc0 | 70 | static int xenfb_remove(struct xenbus_device *); |
e4dcff1f | 71 | static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *); |
4ee36dc0 MA |
72 | static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *); |
73 | static void xenfb_disconnect_backend(struct xenfb_info *); | |
74 | ||
e4dcff1f MA |
75 | static void xenfb_send_event(struct xenfb_info *info, |
76 | union xenfb_out_event *event) | |
77 | { | |
78 | u32 prod; | |
79 | ||
80 | prod = info->page->out_prod; | |
81 | /* caller ensures !xenfb_queue_full() */ | |
82 | mb(); /* ensure ring space available */ | |
83 | XENFB_OUT_RING_REF(info->page, prod) = *event; | |
84 | wmb(); /* ensure ring contents visible */ | |
85 | info->page->out_prod = prod + 1; | |
86 | ||
87 | notify_remote_via_irq(info->irq); | |
88 | } | |
89 | ||
4ee36dc0 MA |
90 | static void xenfb_do_update(struct xenfb_info *info, |
91 | int x, int y, int w, int h) | |
92 | { | |
93 | union xenfb_out_event event; | |
4ee36dc0 | 94 | |
f4ad1ebd | 95 | memset(&event, 0, sizeof(event)); |
4ee36dc0 MA |
96 | event.type = XENFB_TYPE_UPDATE; |
97 | event.update.x = x; | |
98 | event.update.y = y; | |
99 | event.update.width = w; | |
100 | event.update.height = h; | |
101 | ||
4ee36dc0 | 102 | /* caller ensures !xenfb_queue_full() */ |
e4dcff1f MA |
103 | xenfb_send_event(info, &event); |
104 | } | |
4ee36dc0 | 105 | |
e4dcff1f MA |
106 | static void xenfb_do_resize(struct xenfb_info *info) |
107 | { | |
108 | union xenfb_out_event event; | |
109 | ||
110 | memset(&event, 0, sizeof(event)); | |
111 | event.resize = info->resize; | |
112 | ||
113 | /* caller ensures !xenfb_queue_full() */ | |
114 | xenfb_send_event(info, &event); | |
4ee36dc0 MA |
115 | } |
116 | ||
117 | static int xenfb_queue_full(struct xenfb_info *info) | |
118 | { | |
119 | u32 cons, prod; | |
120 | ||
121 | prod = info->page->out_prod; | |
122 | cons = info->page->out_cons; | |
123 | return prod - cons == XENFB_OUT_RING_LEN; | |
124 | } | |
125 | ||
e4dcff1f MA |
126 | static void xenfb_handle_resize_dpy(struct xenfb_info *info) |
127 | { | |
128 | unsigned long flags; | |
129 | ||
130 | spin_lock_irqsave(&info->resize_lock, flags); | |
131 | if (info->resize_dpy) { | |
132 | if (!xenfb_queue_full(info)) { | |
133 | info->resize_dpy = 0; | |
134 | xenfb_do_resize(info); | |
135 | } | |
136 | } | |
137 | spin_unlock_irqrestore(&info->resize_lock, flags); | |
138 | } | |
139 | ||
4ee36dc0 MA |
140 | static void xenfb_refresh(struct xenfb_info *info, |
141 | int x1, int y1, int w, int h) | |
142 | { | |
143 | unsigned long flags; | |
4ee36dc0 | 144 | int x2 = x1 + w - 1; |
e4dcff1f MA |
145 | int y2 = y1 + h - 1; |
146 | ||
147 | xenfb_handle_resize_dpy(info); | |
4ee36dc0 MA |
148 | |
149 | if (!info->update_wanted) | |
150 | return; | |
151 | ||
152 | spin_lock_irqsave(&info->dirty_lock, flags); | |
153 | ||
154 | /* Combine with dirty rectangle: */ | |
155 | if (info->y1 < y1) | |
156 | y1 = info->y1; | |
157 | if (info->y2 > y2) | |
158 | y2 = info->y2; | |
159 | if (info->x1 < x1) | |
160 | x1 = info->x1; | |
161 | if (info->x2 > x2) | |
162 | x2 = info->x2; | |
163 | ||
164 | if (xenfb_queue_full(info)) { | |
165 | /* Can't send right now, stash it in the dirty rectangle */ | |
166 | info->x1 = x1; | |
167 | info->x2 = x2; | |
168 | info->y1 = y1; | |
169 | info->y2 = y2; | |
170 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
171 | return; | |
172 | } | |
173 | ||
174 | /* Clear dirty rectangle: */ | |
175 | info->x1 = info->y1 = INT_MAX; | |
176 | info->x2 = info->y2 = 0; | |
177 | ||
178 | spin_unlock_irqrestore(&info->dirty_lock, flags); | |
179 | ||
180 | if (x1 <= x2 && y1 <= y2) | |
181 | xenfb_do_update(info, x1, y1, x2 - x1 + 1, y2 - y1 + 1); | |
182 | } | |
183 | ||
184 | static void xenfb_deferred_io(struct fb_info *fb_info, | |
185 | struct list_head *pagelist) | |
186 | { | |
187 | struct xenfb_info *info = fb_info->par; | |
188 | struct page *page; | |
189 | unsigned long beg, end; | |
190 | int y1, y2, miny, maxy; | |
191 | ||
192 | miny = INT_MAX; | |
193 | maxy = 0; | |
194 | list_for_each_entry(page, pagelist, lru) { | |
195 | beg = page->index << PAGE_SHIFT; | |
196 | end = beg + PAGE_SIZE - 1; | |
197 | y1 = beg / fb_info->fix.line_length; | |
198 | y2 = end / fb_info->fix.line_length; | |
199 | if (y2 >= fb_info->var.yres) | |
200 | y2 = fb_info->var.yres - 1; | |
201 | if (miny > y1) | |
202 | miny = y1; | |
203 | if (maxy < y2) | |
204 | maxy = y2; | |
205 | } | |
206 | xenfb_refresh(info, 0, miny, fb_info->var.xres, maxy - miny + 1); | |
207 | } | |
208 | ||
209 | static struct fb_deferred_io xenfb_defio = { | |
210 | .delay = HZ / 20, | |
211 | .deferred_io = xenfb_deferred_io, | |
212 | }; | |
213 | ||
214 | static int xenfb_setcolreg(unsigned regno, unsigned red, unsigned green, | |
215 | unsigned blue, unsigned transp, | |
216 | struct fb_info *info) | |
217 | { | |
218 | u32 v; | |
219 | ||
220 | if (regno > info->cmap.len) | |
221 | return 1; | |
222 | ||
223 | #define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16) | |
224 | red = CNVT_TOHW(red, info->var.red.length); | |
225 | green = CNVT_TOHW(green, info->var.green.length); | |
226 | blue = CNVT_TOHW(blue, info->var.blue.length); | |
227 | transp = CNVT_TOHW(transp, info->var.transp.length); | |
228 | #undef CNVT_TOHW | |
229 | ||
230 | v = (red << info->var.red.offset) | | |
231 | (green << info->var.green.offset) | | |
232 | (blue << info->var.blue.offset); | |
233 | ||
234 | switch (info->var.bits_per_pixel) { | |
235 | case 16: | |
236 | case 24: | |
237 | case 32: | |
238 | ((u32 *)info->pseudo_palette)[regno] = v; | |
239 | break; | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static void xenfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect) | |
246 | { | |
247 | struct xenfb_info *info = p->par; | |
248 | ||
249 | sys_fillrect(p, rect); | |
250 | xenfb_refresh(info, rect->dx, rect->dy, rect->width, rect->height); | |
251 | } | |
252 | ||
253 | static void xenfb_imageblit(struct fb_info *p, const struct fb_image *image) | |
254 | { | |
255 | struct xenfb_info *info = p->par; | |
256 | ||
257 | sys_imageblit(p, image); | |
258 | xenfb_refresh(info, image->dx, image->dy, image->width, image->height); | |
259 | } | |
260 | ||
261 | static void xenfb_copyarea(struct fb_info *p, const struct fb_copyarea *area) | |
262 | { | |
263 | struct xenfb_info *info = p->par; | |
264 | ||
265 | sys_copyarea(p, area); | |
266 | xenfb_refresh(info, area->dx, area->dy, area->width, area->height); | |
267 | } | |
268 | ||
269 | static ssize_t xenfb_write(struct fb_info *p, const char __user *buf, | |
270 | size_t count, loff_t *ppos) | |
271 | { | |
272 | struct xenfb_info *info = p->par; | |
273 | ssize_t res; | |
274 | ||
275 | res = fb_sys_write(p, buf, count, ppos); | |
276 | xenfb_refresh(info, 0, 0, info->page->width, info->page->height); | |
277 | return res; | |
278 | } | |
279 | ||
e4dcff1f MA |
280 | static int |
281 | xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
282 | { | |
283 | struct xenfb_info *xenfb_info; | |
284 | int required_mem_len; | |
285 | ||
286 | xenfb_info = info->par; | |
287 | ||
288 | if (!xenfb_info->feature_resize) { | |
289 | if (var->xres == video[KPARAM_WIDTH] && | |
290 | var->yres == video[KPARAM_HEIGHT] && | |
291 | var->bits_per_pixel == xenfb_info->page->depth) { | |
292 | return 0; | |
293 | } | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
297 | /* Can't resize past initial width and height */ | |
298 | if (var->xres > video[KPARAM_WIDTH] || var->yres > video[KPARAM_HEIGHT]) | |
299 | return -EINVAL; | |
300 | ||
301 | required_mem_len = var->xres * var->yres * xenfb_info->page->depth / 8; | |
302 | if (var->bits_per_pixel == xenfb_info->page->depth && | |
303 | var->xres <= info->fix.line_length / (XENFB_DEPTH / 8) && | |
304 | required_mem_len <= info->fix.smem_len) { | |
305 | var->xres_virtual = var->xres; | |
306 | var->yres_virtual = var->yres; | |
307 | return 0; | |
308 | } | |
309 | return -EINVAL; | |
310 | } | |
311 | ||
312 | static int xenfb_set_par(struct fb_info *info) | |
313 | { | |
314 | struct xenfb_info *xenfb_info; | |
315 | unsigned long flags; | |
316 | ||
317 | xenfb_info = info->par; | |
318 | ||
319 | spin_lock_irqsave(&xenfb_info->resize_lock, flags); | |
320 | xenfb_info->resize.type = XENFB_TYPE_RESIZE; | |
321 | xenfb_info->resize.width = info->var.xres; | |
322 | xenfb_info->resize.height = info->var.yres; | |
323 | xenfb_info->resize.stride = info->fix.line_length; | |
324 | xenfb_info->resize.depth = info->var.bits_per_pixel; | |
325 | xenfb_info->resize.offset = 0; | |
326 | xenfb_info->resize_dpy = 1; | |
327 | spin_unlock_irqrestore(&xenfb_info->resize_lock, flags); | |
328 | return 0; | |
329 | } | |
330 | ||
4ee36dc0 MA |
331 | static struct fb_ops xenfb_fb_ops = { |
332 | .owner = THIS_MODULE, | |
333 | .fb_read = fb_sys_read, | |
334 | .fb_write = xenfb_write, | |
335 | .fb_setcolreg = xenfb_setcolreg, | |
336 | .fb_fillrect = xenfb_fillrect, | |
337 | .fb_copyarea = xenfb_copyarea, | |
338 | .fb_imageblit = xenfb_imageblit, | |
e4dcff1f MA |
339 | .fb_check_var = xenfb_check_var, |
340 | .fb_set_par = xenfb_set_par, | |
4ee36dc0 MA |
341 | }; |
342 | ||
343 | static irqreturn_t xenfb_event_handler(int rq, void *dev_id) | |
344 | { | |
345 | /* | |
346 | * No in events recognized, simply ignore them all. | |
347 | * If you need to recognize some, see xen-kbdfront's | |
348 | * input_handler() for how to do that. | |
349 | */ | |
350 | struct xenfb_info *info = dev_id; | |
351 | struct xenfb_page *page = info->page; | |
352 | ||
353 | if (page->in_cons != page->in_prod) { | |
354 | info->page->in_cons = info->page->in_prod; | |
355 | notify_remote_via_irq(info->irq); | |
356 | } | |
357 | ||
358 | /* Flush dirty rectangle: */ | |
359 | xenfb_refresh(info, INT_MAX, INT_MAX, -INT_MAX, -INT_MAX); | |
360 | ||
361 | return IRQ_HANDLED; | |
362 | } | |
363 | ||
48c68c4f GKH |
364 | static int xenfb_probe(struct xenbus_device *dev, |
365 | const struct xenbus_device_id *id) | |
4ee36dc0 MA |
366 | { |
367 | struct xenfb_info *info; | |
368 | struct fb_info *fb_info; | |
e4dcff1f MA |
369 | int fb_size; |
370 | int val; | |
a7a97c63 | 371 | int ret = 0; |
4ee36dc0 MA |
372 | |
373 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
374 | if (info == NULL) { | |
375 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); | |
376 | return -ENOMEM; | |
377 | } | |
e4dcff1f MA |
378 | |
379 | /* Limit kernel param videoram amount to what is in xenstore */ | |
380 | if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) { | |
381 | if (val < video[KPARAM_MEM]) | |
382 | video[KPARAM_MEM] = val; | |
383 | } | |
384 | ||
5a93db42 JG |
385 | video[KPARAM_WIDTH] = xenbus_read_unsigned(dev->otherend, "width", |
386 | video[KPARAM_WIDTH]); | |
387 | video[KPARAM_HEIGHT] = xenbus_read_unsigned(dev->otherend, "height", | |
388 | video[KPARAM_HEIGHT]); | |
389 | ||
e4dcff1f MA |
390 | /* If requested res does not fit in available memory, use default */ |
391 | fb_size = video[KPARAM_MEM] * 1024 * 1024; | |
392 | if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH / 8 | |
393 | > fb_size) { | |
5a93db42 JG |
394 | pr_warn("display parameters %d,%d,%d invalid, use defaults\n", |
395 | video[KPARAM_MEM], video[KPARAM_WIDTH], | |
396 | video[KPARAM_HEIGHT]); | |
e4dcff1f MA |
397 | video[KPARAM_WIDTH] = XENFB_WIDTH; |
398 | video[KPARAM_HEIGHT] = XENFB_HEIGHT; | |
399 | fb_size = XENFB_DEFAULT_FB_LEN; | |
400 | } | |
401 | ||
1b713e00 | 402 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
403 | info->xbdev = dev; |
404 | info->irq = -1; | |
405 | info->x1 = info->y1 = INT_MAX; | |
406 | spin_lock_init(&info->dirty_lock); | |
e4dcff1f | 407 | spin_lock_init(&info->resize_lock); |
4ee36dc0 | 408 | |
1b86d775 | 409 | info->fb = vzalloc(fb_size); |
4ee36dc0 MA |
410 | if (info->fb == NULL) |
411 | goto error_nomem; | |
4ee36dc0 | 412 | |
e4dcff1f | 413 | info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4ee36dc0 | 414 | |
42bc47b3 | 415 | info->gfns = vmalloc(array_size(sizeof(unsigned long), info->nr_pages)); |
0467533a | 416 | if (!info->gfns) |
4ee36dc0 MA |
417 | goto error_nomem; |
418 | ||
419 | /* set up shared page */ | |
420 | info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
421 | if (!info->page) | |
422 | goto error_nomem; | |
423 | ||
4ee36dc0 MA |
424 | /* abusing framebuffer_alloc() to allocate pseudo_palette */ |
425 | fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL); | |
426 | if (fb_info == NULL) | |
427 | goto error_nomem; | |
428 | ||
429 | /* complete the abuse: */ | |
430 | fb_info->pseudo_palette = fb_info->par; | |
431 | fb_info->par = info; | |
432 | ||
433 | fb_info->screen_base = info->fb; | |
434 | ||
435 | fb_info->fbops = &xenfb_fb_ops; | |
e4dcff1f MA |
436 | fb_info->var.xres_virtual = fb_info->var.xres = video[KPARAM_WIDTH]; |
437 | fb_info->var.yres_virtual = fb_info->var.yres = video[KPARAM_HEIGHT]; | |
438 | fb_info->var.bits_per_pixel = XENFB_DEPTH; | |
4ee36dc0 MA |
439 | |
440 | fb_info->var.red = (struct fb_bitfield){16, 8, 0}; | |
441 | fb_info->var.green = (struct fb_bitfield){8, 8, 0}; | |
442 | fb_info->var.blue = (struct fb_bitfield){0, 8, 0}; | |
443 | ||
444 | fb_info->var.activate = FB_ACTIVATE_NOW; | |
445 | fb_info->var.height = -1; | |
446 | fb_info->var.width = -1; | |
447 | fb_info->var.vmode = FB_VMODE_NONINTERLACED; | |
448 | ||
449 | fb_info->fix.visual = FB_VISUAL_TRUECOLOR; | |
e4dcff1f | 450 | fb_info->fix.line_length = fb_info->var.xres * XENFB_DEPTH / 8; |
4ee36dc0 | 451 | fb_info->fix.smem_start = 0; |
e4dcff1f | 452 | fb_info->fix.smem_len = fb_size; |
4ee36dc0 MA |
453 | strcpy(fb_info->fix.id, "xen"); |
454 | fb_info->fix.type = FB_TYPE_PACKED_PIXELS; | |
455 | fb_info->fix.accel = FB_ACCEL_NONE; | |
456 | ||
df11303c | 457 | fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; |
4ee36dc0 MA |
458 | |
459 | ret = fb_alloc_cmap(&fb_info->cmap, 256, 0); | |
460 | if (ret < 0) { | |
461 | framebuffer_release(fb_info); | |
462 | xenbus_dev_fatal(dev, ret, "fb_alloc_cmap"); | |
463 | goto error; | |
464 | } | |
465 | ||
466 | fb_info->fbdefio = &xenfb_defio; | |
467 | fb_deferred_io_init(fb_info); | |
468 | ||
e4dcff1f MA |
469 | xenfb_init_shared_page(info, fb_info); |
470 | ||
0a80fb10 | 471 | ret = xenfb_connect_backend(dev, info); |
a7a97c63 JL |
472 | if (ret < 0) { |
473 | xenbus_dev_fatal(dev, ret, "xenfb_connect_backend"); | |
474 | goto error_fb; | |
475 | } | |
0a80fb10 | 476 | |
4ee36dc0 MA |
477 | ret = register_framebuffer(fb_info); |
478 | if (ret) { | |
4ee36dc0 | 479 | xenbus_dev_fatal(dev, ret, "register_framebuffer"); |
a7a97c63 | 480 | goto error_fb; |
4ee36dc0 MA |
481 | } |
482 | info->fb_info = fb_info; | |
483 | ||
9e124fe1 | 484 | xenfb_make_preferred_console(); |
4ee36dc0 MA |
485 | return 0; |
486 | ||
a7a97c63 JL |
487 | error_fb: |
488 | fb_deferred_io_cleanup(fb_info); | |
489 | fb_dealloc_cmap(&fb_info->cmap); | |
490 | framebuffer_release(fb_info); | |
491 | error_nomem: | |
492 | if (!ret) { | |
493 | ret = -ENOMEM; | |
494 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
495 | } | |
496 | error: | |
4ee36dc0 MA |
497 | xenfb_remove(dev); |
498 | return ret; | |
499 | } | |
500 | ||
48c68c4f | 501 | static void xenfb_make_preferred_console(void) |
9e124fe1 MA |
502 | { |
503 | struct console *c; | |
504 | ||
505 | if (console_set_on_cmdline) | |
506 | return; | |
507 | ||
ac751efa | 508 | console_lock(); |
281e6605 | 509 | for_each_console(c) { |
9e124fe1 MA |
510 | if (!strcmp(c->name, "tty") && c->index == 0) |
511 | break; | |
512 | } | |
ac751efa | 513 | console_unlock(); |
9e124fe1 MA |
514 | if (c) { |
515 | unregister_console(c); | |
516 | c->flags |= CON_CONSDEV; | |
517 | c->flags &= ~CON_PRINTBUFFER; /* don't print again */ | |
518 | register_console(c); | |
519 | } | |
520 | } | |
521 | ||
4ee36dc0 MA |
522 | static int xenfb_resume(struct xenbus_device *dev) |
523 | { | |
1b713e00 | 524 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
525 | |
526 | xenfb_disconnect_backend(info); | |
e4dcff1f | 527 | xenfb_init_shared_page(info, info->fb_info); |
4ee36dc0 MA |
528 | return xenfb_connect_backend(dev, info); |
529 | } | |
530 | ||
531 | static int xenfb_remove(struct xenbus_device *dev) | |
532 | { | |
1b713e00 | 533 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
534 | |
535 | xenfb_disconnect_backend(info); | |
536 | if (info->fb_info) { | |
537 | fb_deferred_io_cleanup(info->fb_info); | |
538 | unregister_framebuffer(info->fb_info); | |
539 | fb_dealloc_cmap(&info->fb_info->cmap); | |
540 | framebuffer_release(info->fb_info); | |
541 | } | |
542 | free_page((unsigned long)info->page); | |
0467533a | 543 | vfree(info->gfns); |
4ee36dc0 MA |
544 | vfree(info->fb); |
545 | kfree(info); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
0467533a | 550 | static unsigned long vmalloc_to_gfn(void *address) |
4ee36dc0 | 551 | { |
0467533a | 552 | return xen_page_to_gfn(vmalloc_to_page(address)); |
4ee36dc0 MA |
553 | } |
554 | ||
e4dcff1f MA |
555 | static void xenfb_init_shared_page(struct xenfb_info *info, |
556 | struct fb_info *fb_info) | |
4ee36dc0 MA |
557 | { |
558 | int i; | |
0467533a | 559 | int epd = PAGE_SIZE / sizeof(info->gfns[0]); |
4ee36dc0 MA |
560 | |
561 | for (i = 0; i < info->nr_pages; i++) | |
0467533a | 562 | info->gfns[i] = vmalloc_to_gfn(info->fb + i * PAGE_SIZE); |
4ee36dc0 | 563 | |
e4dcff1f | 564 | for (i = 0; i * epd < info->nr_pages; i++) |
0467533a | 565 | info->page->pd[i] = vmalloc_to_gfn(&info->gfns[i * epd]); |
e4dcff1f MA |
566 | |
567 | info->page->width = fb_info->var.xres; | |
568 | info->page->height = fb_info->var.yres; | |
569 | info->page->depth = fb_info->var.bits_per_pixel; | |
570 | info->page->line_length = fb_info->fix.line_length; | |
571 | info->page->mem_length = fb_info->fix.smem_len; | |
4ee36dc0 MA |
572 | info->page->in_cons = info->page->in_prod = 0; |
573 | info->page->out_cons = info->page->out_prod = 0; | |
574 | } | |
575 | ||
576 | static int xenfb_connect_backend(struct xenbus_device *dev, | |
577 | struct xenfb_info *info) | |
578 | { | |
fc550e95 | 579 | int ret, evtchn, irq; |
4ee36dc0 MA |
580 | struct xenbus_transaction xbt; |
581 | ||
582 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
583 | if (ret) | |
584 | return ret; | |
fc550e95 | 585 | irq = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, |
4ee36dc0 | 586 | 0, dev->devicetype, info); |
fc550e95 | 587 | if (irq < 0) { |
4ee36dc0 MA |
588 | xenbus_free_evtchn(dev, evtchn); |
589 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
fc550e95 | 590 | return irq; |
4ee36dc0 | 591 | } |
4ee36dc0 MA |
592 | again: |
593 | ret = xenbus_transaction_start(&xbt); | |
594 | if (ret) { | |
595 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
fc550e95 | 596 | goto unbind_irq; |
4ee36dc0 MA |
597 | } |
598 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
0df4f266 | 599 | virt_to_gfn(info->page)); |
4ee36dc0 MA |
600 | if (ret) |
601 | goto error_xenbus; | |
602 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
603 | evtchn); | |
604 | if (ret) | |
605 | goto error_xenbus; | |
606 | ret = xenbus_printf(xbt, dev->nodename, "protocol", "%s", | |
607 | XEN_IO_PROTO_ABI_NATIVE); | |
608 | if (ret) | |
609 | goto error_xenbus; | |
610 | ret = xenbus_printf(xbt, dev->nodename, "feature-update", "1"); | |
611 | if (ret) | |
612 | goto error_xenbus; | |
613 | ret = xenbus_transaction_end(xbt, 0); | |
614 | if (ret) { | |
615 | if (ret == -EAGAIN) | |
616 | goto again; | |
617 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
fc550e95 | 618 | goto unbind_irq; |
4ee36dc0 MA |
619 | } |
620 | ||
621 | xenbus_switch_state(dev, XenbusStateInitialised); | |
fc550e95 | 622 | info->irq = irq; |
4ee36dc0 MA |
623 | return 0; |
624 | ||
625 | error_xenbus: | |
626 | xenbus_transaction_end(xbt, 1); | |
627 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
fc550e95 JJ |
628 | unbind_irq: |
629 | unbind_from_irqhandler(irq, info); | |
4ee36dc0 MA |
630 | return ret; |
631 | } | |
632 | ||
633 | static void xenfb_disconnect_backend(struct xenfb_info *info) | |
634 | { | |
731f3ab6 JJ |
635 | /* Prevent xenfb refresh */ |
636 | info->update_wanted = 0; | |
4ee36dc0 MA |
637 | if (info->irq >= 0) |
638 | unbind_from_irqhandler(info->irq, info); | |
639 | info->irq = -1; | |
640 | } | |
641 | ||
642 | static void xenfb_backend_changed(struct xenbus_device *dev, | |
643 | enum xenbus_state backend_state) | |
644 | { | |
1b713e00 | 645 | struct xenfb_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
646 | |
647 | switch (backend_state) { | |
648 | case XenbusStateInitialising: | |
649 | case XenbusStateInitialised: | |
b78c9512 NI |
650 | case XenbusStateReconfiguring: |
651 | case XenbusStateReconfigured: | |
4ee36dc0 | 652 | case XenbusStateUnknown: |
4ee36dc0 MA |
653 | break; |
654 | ||
655 | case XenbusStateInitWait: | |
4ee36dc0 MA |
656 | xenbus_switch_state(dev, XenbusStateConnected); |
657 | break; | |
658 | ||
659 | case XenbusStateConnected: | |
660 | /* | |
661 | * Work around xenbus race condition: If backend goes | |
662 | * through InitWait to Connected fast enough, we can | |
663 | * get Connected twice here. | |
664 | */ | |
665 | if (dev->state != XenbusStateConnected) | |
9121b15b JG |
666 | /* no InitWait seen yet, fudge it */ |
667 | xenbus_switch_state(dev, XenbusStateConnected); | |
4ee36dc0 | 668 | |
eaf46e18 JG |
669 | if (xenbus_read_unsigned(info->xbdev->otherend, |
670 | "request-update", 0)) | |
4ee36dc0 | 671 | info->update_wanted = 1; |
e4dcff1f | 672 | |
eaf46e18 JG |
673 | info->feature_resize = xenbus_read_unsigned(dev->otherend, |
674 | "feature-resize", 0); | |
4ee36dc0 MA |
675 | break; |
676 | ||
01bc825f DV |
677 | case XenbusStateClosed: |
678 | if (dev->state == XenbusStateClosed) | |
679 | break; | |
680 | /* Missed the backend's CLOSING state -- fallthrough */ | |
4ee36dc0 MA |
681 | case XenbusStateClosing: |
682 | xenbus_frontend_closed(dev); | |
683 | break; | |
684 | } | |
685 | } | |
686 | ||
73db144b | 687 | static const struct xenbus_device_id xenfb_ids[] = { |
4ee36dc0 MA |
688 | { "vfb" }, |
689 | { "" } | |
690 | }; | |
691 | ||
95afae48 DV |
692 | static struct xenbus_driver xenfb_driver = { |
693 | .ids = xenfb_ids, | |
4ee36dc0 MA |
694 | .probe = xenfb_probe, |
695 | .remove = xenfb_remove, | |
696 | .resume = xenfb_resume, | |
697 | .otherend_changed = xenfb_backend_changed, | |
95afae48 | 698 | }; |
4ee36dc0 MA |
699 | |
700 | static int __init xenfb_init(void) | |
701 | { | |
b1a3b1c8 | 702 | if (!xen_domain()) |
4ee36dc0 MA |
703 | return -ENODEV; |
704 | ||
705 | /* Nothing to do if running in dom0. */ | |
6e833587 | 706 | if (xen_initial_domain()) |
4ee36dc0 MA |
707 | return -ENODEV; |
708 | ||
51c71a3b KRW |
709 | if (!xen_has_pv_devices()) |
710 | return -ENODEV; | |
711 | ||
ffb78a26 | 712 | return xenbus_register_frontend(&xenfb_driver); |
4ee36dc0 MA |
713 | } |
714 | ||
715 | static void __exit xenfb_cleanup(void) | |
716 | { | |
ffb78a26 | 717 | xenbus_unregister_driver(&xenfb_driver); |
4ee36dc0 MA |
718 | } |
719 | ||
720 | module_init(xenfb_init); | |
721 | module_exit(xenfb_cleanup); | |
722 | ||
1e892c95 | 723 | MODULE_DESCRIPTION("Xen virtual framebuffer device frontend"); |
4ee36dc0 | 724 | MODULE_LICENSE("GPL"); |
1e892c95 | 725 | MODULE_ALIAS("xen:vfb"); |