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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/resource.c | |
3 | * | |
4 | * Copyright (C) 1999 Linus Torvalds | |
5 | * Copyright (C) 1999 Martin Mares <mj@ucw.cz> | |
6 | * | |
7 | * Arbitrary resource management. | |
8 | */ | |
9 | ||
65fed8f6 OP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
9984de1a | 12 | #include <linux/export.h> |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/ioport.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/proc_fs.h> | |
8b6d043b | 20 | #include <linux/sched.h> |
1da177e4 | 21 | #include <linux/seq_file.h> |
9ac7849e | 22 | #include <linux/device.h> |
d68612b2 | 23 | #include <linux/pfn.h> |
ebff7d8f | 24 | #include <linux/mm.h> |
90e97820 | 25 | #include <linux/resource_ext.h> |
1da177e4 LT |
26 | #include <asm/io.h> |
27 | ||
28 | ||
29 | struct resource ioport_resource = { | |
30 | .name = "PCI IO", | |
6550e07f | 31 | .start = 0, |
1da177e4 LT |
32 | .end = IO_SPACE_LIMIT, |
33 | .flags = IORESOURCE_IO, | |
34 | }; | |
1da177e4 LT |
35 | EXPORT_SYMBOL(ioport_resource); |
36 | ||
37 | struct resource iomem_resource = { | |
38 | .name = "PCI mem", | |
6550e07f GKH |
39 | .start = 0, |
40 | .end = -1, | |
1da177e4 LT |
41 | .flags = IORESOURCE_MEM, |
42 | }; | |
1da177e4 LT |
43 | EXPORT_SYMBOL(iomem_resource); |
44 | ||
23c570a6 RP |
45 | /* constraints to be met while allocating resources */ |
46 | struct resource_constraint { | |
47 | resource_size_t min, max, align; | |
48 | resource_size_t (*alignf)(void *, const struct resource *, | |
49 | resource_size_t, resource_size_t); | |
50 | void *alignf_data; | |
51 | }; | |
52 | ||
1da177e4 LT |
53 | static DEFINE_RWLOCK(resource_lock); |
54 | ||
ebff7d8f YI |
55 | /* |
56 | * For memory hotplug, there is no way to free resource entries allocated | |
57 | * by boot mem after the system is up. So for reusing the resource entry | |
58 | * we need to remember the resource. | |
59 | */ | |
60 | static struct resource *bootmem_resource_free; | |
61 | static DEFINE_SPINLOCK(bootmem_resource_lock); | |
62 | ||
8c86e70a | 63 | static struct resource *next_resource(struct resource *p, bool sibling_only) |
1da177e4 | 64 | { |
8c86e70a VG |
65 | /* Caller wants to traverse through siblings only */ |
66 | if (sibling_only) | |
67 | return p->sibling; | |
68 | ||
1da177e4 LT |
69 | if (p->child) |
70 | return p->child; | |
71 | while (!p->sibling && p->parent) | |
72 | p = p->parent; | |
73 | return p->sibling; | |
74 | } | |
75 | ||
8c86e70a VG |
76 | static void *r_next(struct seq_file *m, void *v, loff_t *pos) |
77 | { | |
78 | struct resource *p = v; | |
79 | (*pos)++; | |
80 | return (void *)next_resource(p, false); | |
81 | } | |
82 | ||
13eb8375 IM |
83 | #ifdef CONFIG_PROC_FS |
84 | ||
85 | enum { MAX_IORES_LEVEL = 5 }; | |
86 | ||
1da177e4 LT |
87 | static void *r_start(struct seq_file *m, loff_t *pos) |
88 | __acquires(resource_lock) | |
89 | { | |
90 | struct resource *p = m->private; | |
91 | loff_t l = 0; | |
92 | read_lock(&resource_lock); | |
93 | for (p = p->child; p && l < *pos; p = r_next(m, p, &l)) | |
94 | ; | |
95 | return p; | |
96 | } | |
97 | ||
98 | static void r_stop(struct seq_file *m, void *v) | |
99 | __releases(resource_lock) | |
100 | { | |
101 | read_unlock(&resource_lock); | |
102 | } | |
103 | ||
104 | static int r_show(struct seq_file *m, void *v) | |
105 | { | |
106 | struct resource *root = m->private; | |
107 | struct resource *r = v, *p; | |
108 | int width = root->end < 0x10000 ? 4 : 8; | |
109 | int depth; | |
110 | ||
111 | for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent) | |
112 | if (p->parent == root) | |
113 | break; | |
685143ac | 114 | seq_printf(m, "%*s%0*llx-%0*llx : %s\n", |
1da177e4 | 115 | depth * 2, "", |
685143ac GKH |
116 | width, (unsigned long long) r->start, |
117 | width, (unsigned long long) r->end, | |
1da177e4 LT |
118 | r->name ? r->name : "<BAD>"); |
119 | return 0; | |
120 | } | |
121 | ||
15ad7cdc | 122 | static const struct seq_operations resource_op = { |
1da177e4 LT |
123 | .start = r_start, |
124 | .next = r_next, | |
125 | .stop = r_stop, | |
126 | .show = r_show, | |
127 | }; | |
128 | ||
129 | static int ioports_open(struct inode *inode, struct file *file) | |
130 | { | |
131 | int res = seq_open(file, &resource_op); | |
132 | if (!res) { | |
133 | struct seq_file *m = file->private_data; | |
134 | m->private = &ioport_resource; | |
135 | } | |
136 | return res; | |
137 | } | |
138 | ||
139 | static int iomem_open(struct inode *inode, struct file *file) | |
140 | { | |
141 | int res = seq_open(file, &resource_op); | |
142 | if (!res) { | |
143 | struct seq_file *m = file->private_data; | |
144 | m->private = &iomem_resource; | |
145 | } | |
146 | return res; | |
147 | } | |
148 | ||
15ad7cdc | 149 | static const struct file_operations proc_ioports_operations = { |
1da177e4 LT |
150 | .open = ioports_open, |
151 | .read = seq_read, | |
152 | .llseek = seq_lseek, | |
153 | .release = seq_release, | |
154 | }; | |
155 | ||
15ad7cdc | 156 | static const struct file_operations proc_iomem_operations = { |
1da177e4 LT |
157 | .open = iomem_open, |
158 | .read = seq_read, | |
159 | .llseek = seq_lseek, | |
160 | .release = seq_release, | |
161 | }; | |
162 | ||
163 | static int __init ioresources_init(void) | |
164 | { | |
c33fff0a DL |
165 | proc_create("ioports", 0, NULL, &proc_ioports_operations); |
166 | proc_create("iomem", 0, NULL, &proc_iomem_operations); | |
1da177e4 LT |
167 | return 0; |
168 | } | |
169 | __initcall(ioresources_init); | |
170 | ||
171 | #endif /* CONFIG_PROC_FS */ | |
172 | ||
ebff7d8f YI |
173 | static void free_resource(struct resource *res) |
174 | { | |
175 | if (!res) | |
176 | return; | |
177 | ||
178 | if (!PageSlab(virt_to_head_page(res))) { | |
179 | spin_lock(&bootmem_resource_lock); | |
180 | res->sibling = bootmem_resource_free; | |
181 | bootmem_resource_free = res; | |
182 | spin_unlock(&bootmem_resource_lock); | |
183 | } else { | |
184 | kfree(res); | |
185 | } | |
186 | } | |
187 | ||
188 | static struct resource *alloc_resource(gfp_t flags) | |
189 | { | |
190 | struct resource *res = NULL; | |
191 | ||
192 | spin_lock(&bootmem_resource_lock); | |
193 | if (bootmem_resource_free) { | |
194 | res = bootmem_resource_free; | |
195 | bootmem_resource_free = res->sibling; | |
196 | } | |
197 | spin_unlock(&bootmem_resource_lock); | |
198 | ||
199 | if (res) | |
200 | memset(res, 0, sizeof(struct resource)); | |
201 | else | |
202 | res = kzalloc(sizeof(struct resource), flags); | |
203 | ||
204 | return res; | |
205 | } | |
206 | ||
1da177e4 LT |
207 | /* Return the conflict entry if you can't request it */ |
208 | static struct resource * __request_resource(struct resource *root, struct resource *new) | |
209 | { | |
d75fc8bb GKH |
210 | resource_size_t start = new->start; |
211 | resource_size_t end = new->end; | |
1da177e4 LT |
212 | struct resource *tmp, **p; |
213 | ||
214 | if (end < start) | |
215 | return root; | |
216 | if (start < root->start) | |
217 | return root; | |
218 | if (end > root->end) | |
219 | return root; | |
220 | p = &root->child; | |
221 | for (;;) { | |
222 | tmp = *p; | |
223 | if (!tmp || tmp->start > end) { | |
224 | new->sibling = tmp; | |
225 | *p = new; | |
226 | new->parent = root; | |
227 | return NULL; | |
228 | } | |
229 | p = &tmp->sibling; | |
230 | if (tmp->end < start) | |
231 | continue; | |
232 | return tmp; | |
233 | } | |
234 | } | |
235 | ||
236 | static int __release_resource(struct resource *old) | |
237 | { | |
238 | struct resource *tmp, **p; | |
239 | ||
240 | p = &old->parent->child; | |
241 | for (;;) { | |
242 | tmp = *p; | |
243 | if (!tmp) | |
244 | break; | |
245 | if (tmp == old) { | |
246 | *p = tmp->sibling; | |
247 | old->parent = NULL; | |
248 | return 0; | |
249 | } | |
250 | p = &tmp->sibling; | |
251 | } | |
252 | return -EINVAL; | |
253 | } | |
254 | ||
5eeec0ec YL |
255 | static void __release_child_resources(struct resource *r) |
256 | { | |
257 | struct resource *tmp, *p; | |
258 | resource_size_t size; | |
259 | ||
260 | p = r->child; | |
261 | r->child = NULL; | |
262 | while (p) { | |
263 | tmp = p; | |
264 | p = p->sibling; | |
265 | ||
266 | tmp->parent = NULL; | |
267 | tmp->sibling = NULL; | |
268 | __release_child_resources(tmp); | |
269 | ||
270 | printk(KERN_DEBUG "release child resource %pR\n", tmp); | |
271 | /* need to restore size, and keep flags */ | |
272 | size = resource_size(tmp); | |
273 | tmp->start = 0; | |
274 | tmp->end = size - 1; | |
275 | } | |
276 | } | |
277 | ||
278 | void release_child_resources(struct resource *r) | |
279 | { | |
280 | write_lock(&resource_lock); | |
281 | __release_child_resources(r); | |
282 | write_unlock(&resource_lock); | |
283 | } | |
284 | ||
e1ca66d1 | 285 | /** |
66f1207b | 286 | * request_resource_conflict - request and reserve an I/O or memory resource |
e1ca66d1 RD |
287 | * @root: root resource descriptor |
288 | * @new: resource descriptor desired by caller | |
289 | * | |
66f1207b | 290 | * Returns 0 for success, conflict resource on error. |
e1ca66d1 | 291 | */ |
66f1207b | 292 | struct resource *request_resource_conflict(struct resource *root, struct resource *new) |
1da177e4 LT |
293 | { |
294 | struct resource *conflict; | |
295 | ||
296 | write_lock(&resource_lock); | |
297 | conflict = __request_resource(root, new); | |
298 | write_unlock(&resource_lock); | |
66f1207b BH |
299 | return conflict; |
300 | } | |
301 | ||
302 | /** | |
303 | * request_resource - request and reserve an I/O or memory resource | |
304 | * @root: root resource descriptor | |
305 | * @new: resource descriptor desired by caller | |
306 | * | |
307 | * Returns 0 for success, negative error code on error. | |
308 | */ | |
309 | int request_resource(struct resource *root, struct resource *new) | |
310 | { | |
311 | struct resource *conflict; | |
312 | ||
313 | conflict = request_resource_conflict(root, new); | |
1da177e4 LT |
314 | return conflict ? -EBUSY : 0; |
315 | } | |
316 | ||
317 | EXPORT_SYMBOL(request_resource); | |
318 | ||
e1ca66d1 RD |
319 | /** |
320 | * release_resource - release a previously reserved resource | |
321 | * @old: resource pointer | |
322 | */ | |
1da177e4 LT |
323 | int release_resource(struct resource *old) |
324 | { | |
325 | int retval; | |
326 | ||
327 | write_lock(&resource_lock); | |
328 | retval = __release_resource(old); | |
329 | write_unlock(&resource_lock); | |
330 | return retval; | |
331 | } | |
332 | ||
333 | EXPORT_SYMBOL(release_resource); | |
334 | ||
2842f114 | 335 | /* |
3f33647c TK |
336 | * Finds the lowest iomem resource existing within [res->start.res->end). |
337 | * The caller must specify res->start, res->end, res->flags, and optionally | |
338 | * desc and "name". If found, returns 0, res is overwritten, if not found, | |
339 | * returns -1. | |
340 | * This function walks the whole tree and not just first level children until | |
341 | * and unless first_level_children_only is true. | |
2842f114 | 342 | */ |
3f33647c TK |
343 | static int find_next_iomem_res(struct resource *res, unsigned long desc, |
344 | char *name, bool first_level_children_only) | |
2842f114 KH |
345 | { |
346 | resource_size_t start, end; | |
347 | struct resource *p; | |
8c86e70a | 348 | bool sibling_only = false; |
2842f114 KH |
349 | |
350 | BUG_ON(!res); | |
351 | ||
352 | start = res->start; | |
353 | end = res->end; | |
58c1b5b0 | 354 | BUG_ON(start >= end); |
2842f114 | 355 | |
800df627 | 356 | if (first_level_children_only) |
8c86e70a | 357 | sibling_only = true; |
8c86e70a | 358 | |
800df627 VG |
359 | read_lock(&resource_lock); |
360 | ||
361 | for (p = iomem_resource.child; p; p = next_resource(p, sibling_only)) { | |
a3650d53 | 362 | if ((p->flags & res->flags) != res->flags) |
2842f114 | 363 | continue; |
3f33647c TK |
364 | if ((desc != IORES_DESC_NONE) && (desc != p->desc)) |
365 | continue; | |
908eedc6 KH |
366 | if (name && strcmp(p->name, name)) |
367 | continue; | |
2842f114 KH |
368 | if (p->start > end) { |
369 | p = NULL; | |
370 | break; | |
371 | } | |
58c1b5b0 | 372 | if ((p->end >= start) && (p->start < end)) |
2842f114 KH |
373 | break; |
374 | } | |
8c86e70a | 375 | |
2842f114 KH |
376 | read_unlock(&resource_lock); |
377 | if (!p) | |
378 | return -1; | |
379 | /* copy data */ | |
0f04ab5e KH |
380 | if (res->start < p->start) |
381 | res->start = p->start; | |
382 | if (res->end > p->end) | |
383 | res->end = p->end; | |
2842f114 KH |
384 | return 0; |
385 | } | |
908eedc6 | 386 | |
8c86e70a VG |
387 | /* |
388 | * Walks through iomem resources and calls func() with matching resource | |
389 | * ranges. This walks through whole tree and not just first level children. | |
390 | * All the memory ranges which overlap start,end and also match flags and | |
3f33647c TK |
391 | * desc are valid candidates. |
392 | * | |
393 | * @desc: I/O resource descriptor. Use IORES_DESC_NONE to skip @desc check. | |
394 | * @flags: I/O resource flags | |
395 | * @start: start addr | |
396 | * @end: end addr | |
397 | * | |
398 | * NOTE: For a new descriptor search, define a new IORES_DESC in | |
399 | * <linux/ioport.h> and set it in 'desc' of a target resource entry. | |
400 | */ | |
401 | int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, | |
402 | u64 end, void *arg, int (*func)(u64, u64, void *)) | |
403 | { | |
404 | struct resource res; | |
405 | u64 orig_end; | |
406 | int ret = -1; | |
407 | ||
408 | res.start = start; | |
409 | res.end = end; | |
410 | res.flags = flags; | |
411 | orig_end = res.end; | |
412 | ||
413 | while ((res.start < res.end) && | |
414 | (!find_next_iomem_res(&res, desc, NULL, false))) { | |
415 | ||
416 | ret = (*func)(res.start, res.end, arg); | |
417 | if (ret) | |
418 | break; | |
419 | ||
420 | res.start = res.end + 1; | |
421 | res.end = orig_end; | |
422 | } | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Walks through iomem resources and calls @func with matching resource | |
429 | * ranges. This walks the whole tree and not just first level children. | |
430 | * All the memory ranges which overlap start,end and also match flags and | |
8c86e70a VG |
431 | * name are valid candidates. |
432 | * | |
433 | * @name: name of resource | |
434 | * @flags: resource flags | |
435 | * @start: start addr | |
436 | * @end: end addr | |
3f33647c TK |
437 | * |
438 | * NOTE: This function is deprecated and should not be used in new code. | |
439 | * Use walk_iomem_res_desc(), instead. | |
8c86e70a VG |
440 | */ |
441 | int walk_iomem_res(char *name, unsigned long flags, u64 start, u64 end, | |
442 | void *arg, int (*func)(u64, u64, void *)) | |
443 | { | |
444 | struct resource res; | |
445 | u64 orig_end; | |
446 | int ret = -1; | |
447 | ||
448 | res.start = start; | |
449 | res.end = end; | |
450 | res.flags = flags; | |
451 | orig_end = res.end; | |
452 | while ((res.start < res.end) && | |
3f33647c | 453 | (!find_next_iomem_res(&res, IORES_DESC_NONE, name, false))) { |
8c86e70a VG |
454 | ret = (*func)(res.start, res.end, arg); |
455 | if (ret) | |
456 | break; | |
457 | res.start = res.end + 1; | |
458 | res.end = orig_end; | |
459 | } | |
460 | return ret; | |
461 | } | |
462 | ||
463 | /* | |
bd7e6cb3 TK |
464 | * This function calls the @func callback against all memory ranges of type |
465 | * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY. | |
466 | * Now, this function is only for System RAM, it deals with full ranges and | |
467 | * not PFNs. If resources are not PFN-aligned, dealing with PFNs can truncate | |
468 | * ranges. | |
8c86e70a VG |
469 | */ |
470 | int walk_system_ram_res(u64 start, u64 end, void *arg, | |
471 | int (*func)(u64, u64, void *)) | |
472 | { | |
473 | struct resource res; | |
474 | u64 orig_end; | |
475 | int ret = -1; | |
476 | ||
477 | res.start = start; | |
478 | res.end = end; | |
bd7e6cb3 | 479 | res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
8c86e70a VG |
480 | orig_end = res.end; |
481 | while ((res.start < res.end) && | |
3f33647c | 482 | (!find_next_iomem_res(&res, IORES_DESC_NONE, NULL, true))) { |
8c86e70a VG |
483 | ret = (*func)(res.start, res.end, arg); |
484 | if (ret) | |
485 | break; | |
486 | res.start = res.end + 1; | |
487 | res.end = orig_end; | |
488 | } | |
489 | return ret; | |
490 | } | |
491 | ||
492 | #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) | |
493 | ||
908eedc6 | 494 | /* |
bd7e6cb3 TK |
495 | * This function calls the @func callback against all memory ranges of type |
496 | * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY. | |
497 | * It is to be used only for System RAM. | |
908eedc6 KH |
498 | */ |
499 | int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, | |
500 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
75884fb1 KH |
501 | { |
502 | struct resource res; | |
37b99dd5 | 503 | unsigned long pfn, end_pfn; |
75884fb1 KH |
504 | u64 orig_end; |
505 | int ret = -1; | |
908eedc6 | 506 | |
75884fb1 KH |
507 | res.start = (u64) start_pfn << PAGE_SHIFT; |
508 | res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; | |
bd7e6cb3 | 509 | res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
75884fb1 | 510 | orig_end = res.end; |
908eedc6 | 511 | while ((res.start < res.end) && |
3f33647c | 512 | (find_next_iomem_res(&res, IORES_DESC_NONE, NULL, true) >= 0)) { |
37b99dd5 WF |
513 | pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; |
514 | end_pfn = (res.end + 1) >> PAGE_SHIFT; | |
515 | if (end_pfn > pfn) | |
f4149660 | 516 | ret = (*func)(pfn, end_pfn - pfn, arg); |
75884fb1 KH |
517 | if (ret) |
518 | break; | |
519 | res.start = res.end + 1; | |
520 | res.end = orig_end; | |
521 | } | |
522 | return ret; | |
523 | } | |
524 | ||
2842f114 KH |
525 | #endif |
526 | ||
61ef2489 WF |
527 | static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg) |
528 | { | |
529 | return 1; | |
530 | } | |
531 | /* | |
532 | * This generic page_is_ram() returns true if specified address is | |
bd7e6cb3 | 533 | * registered as System RAM in iomem_resource list. |
61ef2489 | 534 | */ |
e5273007 | 535 | int __weak page_is_ram(unsigned long pfn) |
61ef2489 WF |
536 | { |
537 | return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1; | |
538 | } | |
c5a13032 | 539 | EXPORT_SYMBOL_GPL(page_is_ram); |
61ef2489 | 540 | |
124fe20d DW |
541 | /** |
542 | * region_intersects() - determine intersection of region with known resources | |
543 | * @start: region start address | |
544 | * @size: size of region | |
1c29f25b TK |
545 | * @flags: flags of resource (in iomem_resource) |
546 | * @desc: descriptor of resource (in iomem_resource) or IORES_DESC_NONE | |
67cf13ce | 547 | * |
124fe20d | 548 | * Check if the specified region partially overlaps or fully eclipses a |
1c29f25b TK |
549 | * resource identified by @flags and @desc (optional with IORES_DESC_NONE). |
550 | * Return REGION_DISJOINT if the region does not overlap @flags/@desc, | |
551 | * return REGION_MIXED if the region overlaps @flags/@desc and another | |
552 | * resource, and return REGION_INTERSECTS if the region overlaps @flags/@desc | |
553 | * and no other defined resource. Note that REGION_INTERSECTS is also | |
554 | * returned in the case when the specified region overlaps RAM and undefined | |
555 | * memory holes. | |
124fe20d DW |
556 | * |
557 | * region_intersect() is used by memory remapping functions to ensure | |
558 | * the user is not remapping RAM and is a vast speed up over walking | |
559 | * through the resource table page by page. | |
67cf13ce | 560 | */ |
1c29f25b TK |
561 | int region_intersects(resource_size_t start, size_t size, unsigned long flags, |
562 | unsigned long desc) | |
67cf13ce | 563 | { |
124fe20d DW |
564 | resource_size_t end = start + size - 1; |
565 | int type = 0; int other = 0; | |
566 | struct resource *p; | |
67cf13ce MT |
567 | |
568 | read_lock(&resource_lock); | |
569 | for (p = iomem_resource.child; p ; p = p->sibling) { | |
1c29f25b TK |
570 | bool is_type = (((p->flags & flags) == flags) && |
571 | ((desc == IORES_DESC_NONE) || | |
572 | (desc == p->desc))); | |
124fe20d DW |
573 | |
574 | if (start >= p->start && start <= p->end) | |
575 | is_type ? type++ : other++; | |
576 | if (end >= p->start && end <= p->end) | |
577 | is_type ? type++ : other++; | |
578 | if (p->start >= start && p->end <= end) | |
579 | is_type ? type++ : other++; | |
67cf13ce MT |
580 | } |
581 | read_unlock(&resource_lock); | |
124fe20d DW |
582 | |
583 | if (other == 0) | |
584 | return type ? REGION_INTERSECTS : REGION_DISJOINT; | |
585 | ||
586 | if (type) | |
587 | return REGION_MIXED; | |
588 | ||
589 | return REGION_DISJOINT; | |
67cf13ce | 590 | } |
1c29f25b | 591 | EXPORT_SYMBOL_GPL(region_intersects); |
67cf13ce | 592 | |
fcb11918 BH |
593 | void __weak arch_remove_reservations(struct resource *avail) |
594 | { | |
595 | } | |
596 | ||
a9cea017 BH |
597 | static resource_size_t simple_align_resource(void *data, |
598 | const struct resource *avail, | |
599 | resource_size_t size, | |
600 | resource_size_t align) | |
601 | { | |
602 | return avail->start; | |
603 | } | |
604 | ||
5d6b1fa3 BH |
605 | static void resource_clip(struct resource *res, resource_size_t min, |
606 | resource_size_t max) | |
607 | { | |
608 | if (res->start < min) | |
609 | res->start = min; | |
610 | if (res->end > max) | |
611 | res->end = max; | |
612 | } | |
613 | ||
1da177e4 | 614 | /* |
23c570a6 RP |
615 | * Find empty slot in the resource tree with the given range and |
616 | * alignment constraints | |
1da177e4 | 617 | */ |
23c570a6 RP |
618 | static int __find_resource(struct resource *root, struct resource *old, |
619 | struct resource *new, | |
620 | resource_size_t size, | |
621 | struct resource_constraint *constraint) | |
1da177e4 LT |
622 | { |
623 | struct resource *this = root->child; | |
a1862e31 | 624 | struct resource tmp = *new, avail, alloc; |
1da177e4 | 625 | |
0e2c8b8f | 626 | tmp.start = root->start; |
1da177e4 | 627 | /* |
c0f5ac54 BH |
628 | * Skip past an allocated resource that starts at 0, since the assignment |
629 | * of this->start - 1 to tmp->end below would cause an underflow. | |
1da177e4 | 630 | */ |
23c570a6 RP |
631 | if (this && this->start == root->start) { |
632 | tmp.start = (this == old) ? old->start : this->end + 1; | |
1da177e4 LT |
633 | this = this->sibling; |
634 | } | |
c0f5ac54 | 635 | for(;;) { |
1da177e4 | 636 | if (this) |
23c570a6 | 637 | tmp.end = (this == old) ? this->end : this->start - 1; |
1da177e4 | 638 | else |
0e2c8b8f | 639 | tmp.end = root->end; |
5d6b1fa3 | 640 | |
47ea91b4 RP |
641 | if (tmp.end < tmp.start) |
642 | goto next; | |
643 | ||
23c570a6 | 644 | resource_clip(&tmp, constraint->min, constraint->max); |
fcb11918 | 645 | arch_remove_reservations(&tmp); |
a9cea017 | 646 | |
a1862e31 | 647 | /* Check for overflow after ALIGN() */ |
23c570a6 | 648 | avail.start = ALIGN(tmp.start, constraint->align); |
a1862e31 | 649 | avail.end = tmp.end; |
5edb93b8 | 650 | avail.flags = new->flags & ~IORESOURCE_UNSET; |
a1862e31 | 651 | if (avail.start >= tmp.start) { |
5edb93b8 | 652 | alloc.flags = avail.flags; |
23c570a6 RP |
653 | alloc.start = constraint->alignf(constraint->alignf_data, &avail, |
654 | size, constraint->align); | |
a1862e31 BH |
655 | alloc.end = alloc.start + size - 1; |
656 | if (resource_contains(&avail, &alloc)) { | |
657 | new->start = alloc.start; | |
658 | new->end = alloc.end; | |
659 | return 0; | |
660 | } | |
1da177e4 | 661 | } |
47ea91b4 RP |
662 | |
663 | next: if (!this || this->end == root->end) | |
1da177e4 | 664 | break; |
47ea91b4 | 665 | |
23c570a6 RP |
666 | if (this != old) |
667 | tmp.start = this->end + 1; | |
1da177e4 LT |
668 | this = this->sibling; |
669 | } | |
670 | return -EBUSY; | |
671 | } | |
672 | ||
23c570a6 RP |
673 | /* |
674 | * Find empty slot in the resource tree given range and alignment. | |
675 | */ | |
676 | static int find_resource(struct resource *root, struct resource *new, | |
677 | resource_size_t size, | |
678 | struct resource_constraint *constraint) | |
679 | { | |
680 | return __find_resource(root, NULL, new, size, constraint); | |
681 | } | |
682 | ||
e1ca66d1 | 683 | /** |
23c570a6 RP |
684 | * reallocate_resource - allocate a slot in the resource tree given range & alignment. |
685 | * The resource will be relocated if the new size cannot be reallocated in the | |
686 | * current location. | |
687 | * | |
688 | * @root: root resource descriptor | |
689 | * @old: resource descriptor desired by caller | |
690 | * @newsize: new size of the resource descriptor | |
691 | * @constraint: the size and alignment constraints to be met. | |
692 | */ | |
28ab49ff | 693 | static int reallocate_resource(struct resource *root, struct resource *old, |
23c570a6 RP |
694 | resource_size_t newsize, |
695 | struct resource_constraint *constraint) | |
696 | { | |
697 | int err=0; | |
698 | struct resource new = *old; | |
699 | struct resource *conflict; | |
700 | ||
701 | write_lock(&resource_lock); | |
702 | ||
703 | if ((err = __find_resource(root, old, &new, newsize, constraint))) | |
704 | goto out; | |
705 | ||
706 | if (resource_contains(&new, old)) { | |
707 | old->start = new.start; | |
708 | old->end = new.end; | |
709 | goto out; | |
710 | } | |
711 | ||
712 | if (old->child) { | |
713 | err = -EBUSY; | |
714 | goto out; | |
715 | } | |
716 | ||
717 | if (resource_contains(old, &new)) { | |
718 | old->start = new.start; | |
719 | old->end = new.end; | |
720 | } else { | |
721 | __release_resource(old); | |
722 | *old = new; | |
723 | conflict = __request_resource(root, old); | |
724 | BUG_ON(conflict); | |
725 | } | |
726 | out: | |
727 | write_unlock(&resource_lock); | |
728 | return err; | |
729 | } | |
730 | ||
731 | ||
732 | /** | |
733 | * allocate_resource - allocate empty slot in the resource tree given range & alignment. | |
734 | * The resource will be reallocated with a new size if it was already allocated | |
e1ca66d1 RD |
735 | * @root: root resource descriptor |
736 | * @new: resource descriptor desired by caller | |
737 | * @size: requested resource region size | |
ee5e5683 WY |
738 | * @min: minimum boundary to allocate |
739 | * @max: maximum boundary to allocate | |
e1ca66d1 RD |
740 | * @align: alignment requested, in bytes |
741 | * @alignf: alignment function, optional, called if not NULL | |
742 | * @alignf_data: arbitrary data to pass to the @alignf function | |
1da177e4 LT |
743 | */ |
744 | int allocate_resource(struct resource *root, struct resource *new, | |
d75fc8bb GKH |
745 | resource_size_t size, resource_size_t min, |
746 | resource_size_t max, resource_size_t align, | |
b26b2d49 | 747 | resource_size_t (*alignf)(void *, |
3b7a17fc | 748 | const struct resource *, |
b26b2d49 DB |
749 | resource_size_t, |
750 | resource_size_t), | |
1da177e4 LT |
751 | void *alignf_data) |
752 | { | |
753 | int err; | |
23c570a6 | 754 | struct resource_constraint constraint; |
1da177e4 | 755 | |
a9cea017 BH |
756 | if (!alignf) |
757 | alignf = simple_align_resource; | |
758 | ||
23c570a6 RP |
759 | constraint.min = min; |
760 | constraint.max = max; | |
761 | constraint.align = align; | |
762 | constraint.alignf = alignf; | |
763 | constraint.alignf_data = alignf_data; | |
764 | ||
765 | if ( new->parent ) { | |
766 | /* resource is already allocated, try reallocating with | |
767 | the new constraints */ | |
768 | return reallocate_resource(root, new, size, &constraint); | |
769 | } | |
770 | ||
1da177e4 | 771 | write_lock(&resource_lock); |
23c570a6 | 772 | err = find_resource(root, new, size, &constraint); |
1da177e4 LT |
773 | if (err >= 0 && __request_resource(root, new)) |
774 | err = -EBUSY; | |
775 | write_unlock(&resource_lock); | |
776 | return err; | |
777 | } | |
778 | ||
779 | EXPORT_SYMBOL(allocate_resource); | |
780 | ||
1c388919 GU |
781 | /** |
782 | * lookup_resource - find an existing resource by a resource start address | |
783 | * @root: root resource descriptor | |
784 | * @start: resource start address | |
785 | * | |
786 | * Returns a pointer to the resource if found, NULL otherwise | |
787 | */ | |
788 | struct resource *lookup_resource(struct resource *root, resource_size_t start) | |
789 | { | |
790 | struct resource *res; | |
791 | ||
792 | read_lock(&resource_lock); | |
793 | for (res = root->child; res; res = res->sibling) { | |
794 | if (res->start == start) | |
795 | break; | |
796 | } | |
797 | read_unlock(&resource_lock); | |
798 | ||
799 | return res; | |
800 | } | |
801 | ||
bef69ea0 LT |
802 | /* |
803 | * Insert a resource into the resource tree. If successful, return NULL, | |
804 | * otherwise return the conflicting resource (compare to __request_resource()) | |
1da177e4 | 805 | */ |
bef69ea0 | 806 | static struct resource * __insert_resource(struct resource *parent, struct resource *new) |
1da177e4 | 807 | { |
1da177e4 LT |
808 | struct resource *first, *next; |
809 | ||
d33b6fba | 810 | for (;; parent = first) { |
d33b6fba MW |
811 | first = __request_resource(parent, new); |
812 | if (!first) | |
bef69ea0 | 813 | return first; |
d33b6fba | 814 | |
d33b6fba | 815 | if (first == parent) |
bef69ea0 | 816 | return first; |
5de1cb2d HS |
817 | if (WARN_ON(first == new)) /* duplicated insertion */ |
818 | return first; | |
d33b6fba MW |
819 | |
820 | if ((first->start > new->start) || (first->end < new->end)) | |
821 | break; | |
822 | if ((first->start == new->start) && (first->end == new->end)) | |
823 | break; | |
1da177e4 LT |
824 | } |
825 | ||
826 | for (next = first; ; next = next->sibling) { | |
827 | /* Partial overlap? Bad, and unfixable */ | |
828 | if (next->start < new->start || next->end > new->end) | |
bef69ea0 | 829 | return next; |
1da177e4 LT |
830 | if (!next->sibling) |
831 | break; | |
832 | if (next->sibling->start > new->end) | |
833 | break; | |
834 | } | |
835 | ||
1da177e4 LT |
836 | new->parent = parent; |
837 | new->sibling = next->sibling; | |
838 | new->child = first; | |
839 | ||
840 | next->sibling = NULL; | |
841 | for (next = first; next; next = next->sibling) | |
842 | next->parent = new; | |
843 | ||
844 | if (parent->child == first) { | |
845 | parent->child = new; | |
846 | } else { | |
847 | next = parent->child; | |
848 | while (next->sibling != first) | |
849 | next = next->sibling; | |
850 | next->sibling = new; | |
851 | } | |
bef69ea0 LT |
852 | return NULL; |
853 | } | |
1da177e4 | 854 | |
bef69ea0 | 855 | /** |
66f1207b | 856 | * insert_resource_conflict - Inserts resource in the resource tree |
bef69ea0 LT |
857 | * @parent: parent of the new resource |
858 | * @new: new resource to insert | |
859 | * | |
66f1207b | 860 | * Returns 0 on success, conflict resource if the resource can't be inserted. |
bef69ea0 | 861 | * |
66f1207b | 862 | * This function is equivalent to request_resource_conflict when no conflict |
bef69ea0 LT |
863 | * happens. If a conflict happens, and the conflicting resources |
864 | * entirely fit within the range of the new resource, then the new | |
865 | * resource is inserted and the conflicting resources become children of | |
866 | * the new resource. | |
867 | */ | |
66f1207b | 868 | struct resource *insert_resource_conflict(struct resource *parent, struct resource *new) |
bef69ea0 LT |
869 | { |
870 | struct resource *conflict; | |
871 | ||
872 | write_lock(&resource_lock); | |
873 | conflict = __insert_resource(parent, new); | |
874 | write_unlock(&resource_lock); | |
66f1207b BH |
875 | return conflict; |
876 | } | |
877 | ||
878 | /** | |
879 | * insert_resource - Inserts a resource in the resource tree | |
880 | * @parent: parent of the new resource | |
881 | * @new: new resource to insert | |
882 | * | |
883 | * Returns 0 on success, -EBUSY if the resource can't be inserted. | |
884 | */ | |
885 | int insert_resource(struct resource *parent, struct resource *new) | |
886 | { | |
887 | struct resource *conflict; | |
888 | ||
889 | conflict = insert_resource_conflict(parent, new); | |
bef69ea0 LT |
890 | return conflict ? -EBUSY : 0; |
891 | } | |
892 | ||
893 | /** | |
894 | * insert_resource_expand_to_fit - Insert a resource into the resource tree | |
6781f4ae | 895 | * @root: root resource descriptor |
bef69ea0 LT |
896 | * @new: new resource to insert |
897 | * | |
898 | * Insert a resource into the resource tree, possibly expanding it in order | |
899 | * to make it encompass any conflicting resources. | |
900 | */ | |
901 | void insert_resource_expand_to_fit(struct resource *root, struct resource *new) | |
902 | { | |
903 | if (new->parent) | |
904 | return; | |
905 | ||
906 | write_lock(&resource_lock); | |
907 | for (;;) { | |
908 | struct resource *conflict; | |
909 | ||
910 | conflict = __insert_resource(root, new); | |
911 | if (!conflict) | |
912 | break; | |
913 | if (conflict == root) | |
914 | break; | |
915 | ||
916 | /* Ok, expand resource to cover the conflict, then try again .. */ | |
917 | if (conflict->start < new->start) | |
918 | new->start = conflict->start; | |
919 | if (conflict->end > new->end) | |
920 | new->end = conflict->end; | |
921 | ||
922 | printk("Expanded resource %s due to conflict with %s\n", new->name, conflict->name); | |
923 | } | |
1da177e4 | 924 | write_unlock(&resource_lock); |
1da177e4 LT |
925 | } |
926 | ||
ae8e3a91 TK |
927 | static int __adjust_resource(struct resource *res, resource_size_t start, |
928 | resource_size_t size) | |
1da177e4 LT |
929 | { |
930 | struct resource *tmp, *parent = res->parent; | |
d75fc8bb | 931 | resource_size_t end = start + size - 1; |
1da177e4 LT |
932 | int result = -EBUSY; |
933 | ||
82ec90ea YL |
934 | if (!parent) |
935 | goto skip; | |
936 | ||
1da177e4 LT |
937 | if ((start < parent->start) || (end > parent->end)) |
938 | goto out; | |
939 | ||
1da177e4 LT |
940 | if (res->sibling && (res->sibling->start <= end)) |
941 | goto out; | |
942 | ||
943 | tmp = parent->child; | |
944 | if (tmp != res) { | |
945 | while (tmp->sibling != res) | |
946 | tmp = tmp->sibling; | |
947 | if (start <= tmp->end) | |
948 | goto out; | |
949 | } | |
950 | ||
82ec90ea YL |
951 | skip: |
952 | for (tmp = res->child; tmp; tmp = tmp->sibling) | |
953 | if ((tmp->start < start) || (tmp->end > end)) | |
954 | goto out; | |
955 | ||
1da177e4 LT |
956 | res->start = start; |
957 | res->end = end; | |
958 | result = 0; | |
959 | ||
960 | out: | |
ae8e3a91 TK |
961 | return result; |
962 | } | |
963 | ||
964 | /** | |
965 | * adjust_resource - modify a resource's start and size | |
966 | * @res: resource to modify | |
967 | * @start: new start value | |
968 | * @size: new size | |
969 | * | |
970 | * Given an existing resource, change its start and size to match the | |
971 | * arguments. Returns 0 on success, -EBUSY if it can't fit. | |
972 | * Existing children of the resource are assumed to be immutable. | |
973 | */ | |
974 | int adjust_resource(struct resource *res, resource_size_t start, | |
975 | resource_size_t size) | |
976 | { | |
977 | int result; | |
978 | ||
979 | write_lock(&resource_lock); | |
980 | result = __adjust_resource(res, start, size); | |
1da177e4 LT |
981 | write_unlock(&resource_lock); |
982 | return result; | |
983 | } | |
24105748 | 984 | EXPORT_SYMBOL(adjust_resource); |
1da177e4 | 985 | |
268364a0 YL |
986 | static void __init __reserve_region_with_split(struct resource *root, |
987 | resource_size_t start, resource_size_t end, | |
988 | const char *name) | |
989 | { | |
990 | struct resource *parent = root; | |
991 | struct resource *conflict; | |
ebff7d8f | 992 | struct resource *res = alloc_resource(GFP_ATOMIC); |
4965f566 | 993 | struct resource *next_res = NULL; |
268364a0 YL |
994 | |
995 | if (!res) | |
996 | return; | |
997 | ||
998 | res->name = name; | |
999 | res->start = start; | |
1000 | res->end = end; | |
1001 | res->flags = IORESOURCE_BUSY; | |
43ee493b | 1002 | res->desc = IORES_DESC_NONE; |
268364a0 | 1003 | |
4965f566 | 1004 | while (1) { |
268364a0 | 1005 | |
4965f566 M |
1006 | conflict = __request_resource(parent, res); |
1007 | if (!conflict) { | |
1008 | if (!next_res) | |
1009 | break; | |
1010 | res = next_res; | |
1011 | next_res = NULL; | |
1012 | continue; | |
1013 | } | |
268364a0 | 1014 | |
4965f566 M |
1015 | /* conflict covered whole area */ |
1016 | if (conflict->start <= res->start && | |
1017 | conflict->end >= res->end) { | |
ebff7d8f | 1018 | free_resource(res); |
4965f566 M |
1019 | WARN_ON(next_res); |
1020 | break; | |
1021 | } | |
1022 | ||
1023 | /* failed, split and try again */ | |
1024 | if (conflict->start > res->start) { | |
1025 | end = res->end; | |
1026 | res->end = conflict->start - 1; | |
1027 | if (conflict->end < end) { | |
ebff7d8f | 1028 | next_res = alloc_resource(GFP_ATOMIC); |
4965f566 | 1029 | if (!next_res) { |
ebff7d8f | 1030 | free_resource(res); |
4965f566 M |
1031 | break; |
1032 | } | |
1033 | next_res->name = name; | |
1034 | next_res->start = conflict->end + 1; | |
1035 | next_res->end = end; | |
1036 | next_res->flags = IORESOURCE_BUSY; | |
43ee493b | 1037 | next_res->desc = IORES_DESC_NONE; |
4965f566 M |
1038 | } |
1039 | } else { | |
1040 | res->start = conflict->end + 1; | |
1041 | } | |
1042 | } | |
268364a0 YL |
1043 | |
1044 | } | |
1045 | ||
bea92112 | 1046 | void __init reserve_region_with_split(struct resource *root, |
268364a0 YL |
1047 | resource_size_t start, resource_size_t end, |
1048 | const char *name) | |
1049 | { | |
65fed8f6 OP |
1050 | int abort = 0; |
1051 | ||
268364a0 | 1052 | write_lock(&resource_lock); |
65fed8f6 OP |
1053 | if (root->start > start || root->end < end) { |
1054 | pr_err("requested range [0x%llx-0x%llx] not in root %pr\n", | |
1055 | (unsigned long long)start, (unsigned long long)end, | |
1056 | root); | |
1057 | if (start > root->end || end < root->start) | |
1058 | abort = 1; | |
1059 | else { | |
1060 | if (end > root->end) | |
1061 | end = root->end; | |
1062 | if (start < root->start) | |
1063 | start = root->start; | |
1064 | pr_err("fixing request to [0x%llx-0x%llx]\n", | |
1065 | (unsigned long long)start, | |
1066 | (unsigned long long)end); | |
1067 | } | |
1068 | dump_stack(); | |
1069 | } | |
1070 | if (!abort) | |
1071 | __reserve_region_with_split(root, start, end, name); | |
268364a0 YL |
1072 | write_unlock(&resource_lock); |
1073 | } | |
1074 | ||
88452565 IK |
1075 | /** |
1076 | * resource_alignment - calculate resource's alignment | |
1077 | * @res: resource pointer | |
1078 | * | |
1079 | * Returns alignment on success, 0 (invalid alignment) on failure. | |
1080 | */ | |
1081 | resource_size_t resource_alignment(struct resource *res) | |
1082 | { | |
1083 | switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) { | |
1084 | case IORESOURCE_SIZEALIGN: | |
1a4e564b | 1085 | return resource_size(res); |
88452565 IK |
1086 | case IORESOURCE_STARTALIGN: |
1087 | return res->start; | |
1088 | default: | |
1089 | return 0; | |
1090 | } | |
1091 | } | |
1092 | ||
1da177e4 LT |
1093 | /* |
1094 | * This is compatibility stuff for IO resources. | |
1095 | * | |
1096 | * Note how this, unlike the above, knows about | |
1097 | * the IO flag meanings (busy etc). | |
1098 | * | |
e1ca66d1 | 1099 | * request_region creates a new busy region. |
1da177e4 | 1100 | * |
e1ca66d1 RD |
1101 | * release_region releases a matching busy region. |
1102 | */ | |
1103 | ||
8b6d043b AC |
1104 | static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); |
1105 | ||
e1ca66d1 RD |
1106 | /** |
1107 | * __request_region - create a new busy resource region | |
1108 | * @parent: parent resource descriptor | |
1109 | * @start: resource start address | |
1110 | * @n: resource region size | |
1111 | * @name: reserving caller's ID string | |
6ae301e8 | 1112 | * @flags: IO resource flags |
1da177e4 | 1113 | */ |
d75fc8bb GKH |
1114 | struct resource * __request_region(struct resource *parent, |
1115 | resource_size_t start, resource_size_t n, | |
e8de1481 | 1116 | const char *name, int flags) |
1da177e4 | 1117 | { |
8b6d043b | 1118 | DECLARE_WAITQUEUE(wait, current); |
ebff7d8f | 1119 | struct resource *res = alloc_resource(GFP_KERNEL); |
1da177e4 | 1120 | |
c26ec88e BH |
1121 | if (!res) |
1122 | return NULL; | |
1123 | ||
1124 | res->name = name; | |
1125 | res->start = start; | |
1126 | res->end = start + n - 1; | |
a3650d53 | 1127 | res->flags = resource_type(parent) | resource_ext_type(parent); |
6404e88e | 1128 | res->flags |= IORESOURCE_BUSY | flags; |
43ee493b | 1129 | res->desc = IORES_DESC_NONE; |
c26ec88e BH |
1130 | |
1131 | write_lock(&resource_lock); | |
1132 | ||
1133 | for (;;) { | |
1134 | struct resource *conflict; | |
1135 | ||
1136 | conflict = __request_resource(parent, res); | |
1137 | if (!conflict) | |
1da177e4 | 1138 | break; |
c26ec88e BH |
1139 | if (conflict != parent) { |
1140 | parent = conflict; | |
1141 | if (!(conflict->flags & IORESOURCE_BUSY)) | |
1142 | continue; | |
1da177e4 | 1143 | } |
8b6d043b AC |
1144 | if (conflict->flags & flags & IORESOURCE_MUXED) { |
1145 | add_wait_queue(&muxed_resource_wait, &wait); | |
1146 | write_unlock(&resource_lock); | |
1147 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1148 | schedule(); | |
1149 | remove_wait_queue(&muxed_resource_wait, &wait); | |
1150 | write_lock(&resource_lock); | |
1151 | continue; | |
1152 | } | |
c26ec88e | 1153 | /* Uhhuh, that didn't work out.. */ |
ebff7d8f | 1154 | free_resource(res); |
c26ec88e BH |
1155 | res = NULL; |
1156 | break; | |
1da177e4 | 1157 | } |
c26ec88e | 1158 | write_unlock(&resource_lock); |
1da177e4 LT |
1159 | return res; |
1160 | } | |
1da177e4 LT |
1161 | EXPORT_SYMBOL(__request_region); |
1162 | ||
e1ca66d1 RD |
1163 | /** |
1164 | * __release_region - release a previously reserved resource region | |
1165 | * @parent: parent resource descriptor | |
1166 | * @start: resource start address | |
1167 | * @n: resource region size | |
1168 | * | |
1169 | * The described resource region must match a currently busy region. | |
1170 | */ | |
d75fc8bb GKH |
1171 | void __release_region(struct resource *parent, resource_size_t start, |
1172 | resource_size_t n) | |
1da177e4 LT |
1173 | { |
1174 | struct resource **p; | |
d75fc8bb | 1175 | resource_size_t end; |
1da177e4 LT |
1176 | |
1177 | p = &parent->child; | |
1178 | end = start + n - 1; | |
1179 | ||
1180 | write_lock(&resource_lock); | |
1181 | ||
1182 | for (;;) { | |
1183 | struct resource *res = *p; | |
1184 | ||
1185 | if (!res) | |
1186 | break; | |
1187 | if (res->start <= start && res->end >= end) { | |
1188 | if (!(res->flags & IORESOURCE_BUSY)) { | |
1189 | p = &res->child; | |
1190 | continue; | |
1191 | } | |
1192 | if (res->start != start || res->end != end) | |
1193 | break; | |
1194 | *p = res->sibling; | |
1195 | write_unlock(&resource_lock); | |
8b6d043b AC |
1196 | if (res->flags & IORESOURCE_MUXED) |
1197 | wake_up(&muxed_resource_wait); | |
ebff7d8f | 1198 | free_resource(res); |
1da177e4 LT |
1199 | return; |
1200 | } | |
1201 | p = &res->sibling; | |
1202 | } | |
1203 | ||
1204 | write_unlock(&resource_lock); | |
1205 | ||
685143ac GKH |
1206 | printk(KERN_WARNING "Trying to free nonexistent resource " |
1207 | "<%016llx-%016llx>\n", (unsigned long long)start, | |
1208 | (unsigned long long)end); | |
1da177e4 | 1209 | } |
1da177e4 LT |
1210 | EXPORT_SYMBOL(__release_region); |
1211 | ||
825f787b TK |
1212 | #ifdef CONFIG_MEMORY_HOTREMOVE |
1213 | /** | |
1214 | * release_mem_region_adjustable - release a previously reserved memory region | |
1215 | * @parent: parent resource descriptor | |
1216 | * @start: resource start address | |
1217 | * @size: resource region size | |
1218 | * | |
1219 | * This interface is intended for memory hot-delete. The requested region | |
1220 | * is released from a currently busy memory resource. The requested region | |
1221 | * must either match exactly or fit into a single busy resource entry. In | |
1222 | * the latter case, the remaining resource is adjusted accordingly. | |
1223 | * Existing children of the busy memory resource must be immutable in the | |
1224 | * request. | |
1225 | * | |
1226 | * Note: | |
1227 | * - Additional release conditions, such as overlapping region, can be | |
1228 | * supported after they are confirmed as valid cases. | |
1229 | * - When a busy memory resource gets split into two entries, the code | |
1230 | * assumes that all children remain in the lower address entry for | |
1231 | * simplicity. Enhance this logic when necessary. | |
1232 | */ | |
1233 | int release_mem_region_adjustable(struct resource *parent, | |
1234 | resource_size_t start, resource_size_t size) | |
1235 | { | |
1236 | struct resource **p; | |
1237 | struct resource *res; | |
1238 | struct resource *new_res; | |
1239 | resource_size_t end; | |
1240 | int ret = -EINVAL; | |
1241 | ||
1242 | end = start + size - 1; | |
1243 | if ((start < parent->start) || (end > parent->end)) | |
1244 | return ret; | |
1245 | ||
ebff7d8f YI |
1246 | /* The alloc_resource() result gets checked later */ |
1247 | new_res = alloc_resource(GFP_KERNEL); | |
825f787b TK |
1248 | |
1249 | p = &parent->child; | |
1250 | write_lock(&resource_lock); | |
1251 | ||
1252 | while ((res = *p)) { | |
1253 | if (res->start >= end) | |
1254 | break; | |
1255 | ||
1256 | /* look for the next resource if it does not fit into */ | |
1257 | if (res->start > start || res->end < end) { | |
1258 | p = &res->sibling; | |
1259 | continue; | |
1260 | } | |
1261 | ||
1262 | if (!(res->flags & IORESOURCE_MEM)) | |
1263 | break; | |
1264 | ||
1265 | if (!(res->flags & IORESOURCE_BUSY)) { | |
1266 | p = &res->child; | |
1267 | continue; | |
1268 | } | |
1269 | ||
1270 | /* found the target resource; let's adjust accordingly */ | |
1271 | if (res->start == start && res->end == end) { | |
1272 | /* free the whole entry */ | |
1273 | *p = res->sibling; | |
ebff7d8f | 1274 | free_resource(res); |
825f787b TK |
1275 | ret = 0; |
1276 | } else if (res->start == start && res->end != end) { | |
1277 | /* adjust the start */ | |
1278 | ret = __adjust_resource(res, end + 1, | |
1279 | res->end - end); | |
1280 | } else if (res->start != start && res->end == end) { | |
1281 | /* adjust the end */ | |
1282 | ret = __adjust_resource(res, res->start, | |
1283 | start - res->start); | |
1284 | } else { | |
1285 | /* split into two entries */ | |
1286 | if (!new_res) { | |
1287 | ret = -ENOMEM; | |
1288 | break; | |
1289 | } | |
1290 | new_res->name = res->name; | |
1291 | new_res->start = end + 1; | |
1292 | new_res->end = res->end; | |
1293 | new_res->flags = res->flags; | |
43ee493b | 1294 | new_res->desc = res->desc; |
825f787b TK |
1295 | new_res->parent = res->parent; |
1296 | new_res->sibling = res->sibling; | |
1297 | new_res->child = NULL; | |
1298 | ||
1299 | ret = __adjust_resource(res, res->start, | |
1300 | start - res->start); | |
1301 | if (ret) | |
1302 | break; | |
1303 | res->sibling = new_res; | |
1304 | new_res = NULL; | |
1305 | } | |
1306 | ||
1307 | break; | |
1308 | } | |
1309 | ||
1310 | write_unlock(&resource_lock); | |
ebff7d8f | 1311 | free_resource(new_res); |
825f787b TK |
1312 | return ret; |
1313 | } | |
1314 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
1315 | ||
9ac7849e TH |
1316 | /* |
1317 | * Managed region resource | |
1318 | */ | |
8d38821c TR |
1319 | static void devm_resource_release(struct device *dev, void *ptr) |
1320 | { | |
1321 | struct resource **r = ptr; | |
1322 | ||
1323 | release_resource(*r); | |
1324 | } | |
1325 | ||
1326 | /** | |
1327 | * devm_request_resource() - request and reserve an I/O or memory resource | |
1328 | * @dev: device for which to request the resource | |
1329 | * @root: root of the resource tree from which to request the resource | |
1330 | * @new: descriptor of the resource to request | |
1331 | * | |
1332 | * This is a device-managed version of request_resource(). There is usually | |
1333 | * no need to release resources requested by this function explicitly since | |
1334 | * that will be taken care of when the device is unbound from its driver. | |
1335 | * If for some reason the resource needs to be released explicitly, because | |
1336 | * of ordering issues for example, drivers must call devm_release_resource() | |
1337 | * rather than the regular release_resource(). | |
1338 | * | |
1339 | * When a conflict is detected between any existing resources and the newly | |
1340 | * requested resource, an error message will be printed. | |
1341 | * | |
1342 | * Returns 0 on success or a negative error code on failure. | |
1343 | */ | |
1344 | int devm_request_resource(struct device *dev, struct resource *root, | |
1345 | struct resource *new) | |
1346 | { | |
1347 | struct resource *conflict, **ptr; | |
1348 | ||
1349 | ptr = devres_alloc(devm_resource_release, sizeof(*ptr), GFP_KERNEL); | |
1350 | if (!ptr) | |
1351 | return -ENOMEM; | |
1352 | ||
1353 | *ptr = new; | |
1354 | ||
1355 | conflict = request_resource_conflict(root, new); | |
1356 | if (conflict) { | |
1357 | dev_err(dev, "resource collision: %pR conflicts with %s %pR\n", | |
1358 | new, conflict->name, conflict); | |
1359 | devres_free(ptr); | |
1360 | return -EBUSY; | |
1361 | } | |
1362 | ||
1363 | devres_add(dev, ptr); | |
1364 | return 0; | |
1365 | } | |
1366 | EXPORT_SYMBOL(devm_request_resource); | |
1367 | ||
1368 | static int devm_resource_match(struct device *dev, void *res, void *data) | |
1369 | { | |
1370 | struct resource **ptr = res; | |
1371 | ||
1372 | return *ptr == data; | |
1373 | } | |
1374 | ||
1375 | /** | |
1376 | * devm_release_resource() - release a previously requested resource | |
1377 | * @dev: device for which to release the resource | |
1378 | * @new: descriptor of the resource to release | |
1379 | * | |
1380 | * Releases a resource previously requested using devm_request_resource(). | |
1381 | */ | |
1382 | void devm_release_resource(struct device *dev, struct resource *new) | |
1383 | { | |
1384 | WARN_ON(devres_release(dev, devm_resource_release, devm_resource_match, | |
1385 | new)); | |
1386 | } | |
1387 | EXPORT_SYMBOL(devm_release_resource); | |
1388 | ||
9ac7849e TH |
1389 | struct region_devres { |
1390 | struct resource *parent; | |
1391 | resource_size_t start; | |
1392 | resource_size_t n; | |
1393 | }; | |
1394 | ||
1395 | static void devm_region_release(struct device *dev, void *res) | |
1396 | { | |
1397 | struct region_devres *this = res; | |
1398 | ||
1399 | __release_region(this->parent, this->start, this->n); | |
1400 | } | |
1401 | ||
1402 | static int devm_region_match(struct device *dev, void *res, void *match_data) | |
1403 | { | |
1404 | struct region_devres *this = res, *match = match_data; | |
1405 | ||
1406 | return this->parent == match->parent && | |
1407 | this->start == match->start && this->n == match->n; | |
1408 | } | |
1409 | ||
1410 | struct resource * __devm_request_region(struct device *dev, | |
1411 | struct resource *parent, resource_size_t start, | |
1412 | resource_size_t n, const char *name) | |
1413 | { | |
1414 | struct region_devres *dr = NULL; | |
1415 | struct resource *res; | |
1416 | ||
1417 | dr = devres_alloc(devm_region_release, sizeof(struct region_devres), | |
1418 | GFP_KERNEL); | |
1419 | if (!dr) | |
1420 | return NULL; | |
1421 | ||
1422 | dr->parent = parent; | |
1423 | dr->start = start; | |
1424 | dr->n = n; | |
1425 | ||
e8de1481 | 1426 | res = __request_region(parent, start, n, name, 0); |
9ac7849e TH |
1427 | if (res) |
1428 | devres_add(dev, dr); | |
1429 | else | |
1430 | devres_free(dr); | |
1431 | ||
1432 | return res; | |
1433 | } | |
1434 | EXPORT_SYMBOL(__devm_request_region); | |
1435 | ||
1436 | void __devm_release_region(struct device *dev, struct resource *parent, | |
1437 | resource_size_t start, resource_size_t n) | |
1438 | { | |
1439 | struct region_devres match_data = { parent, start, n }; | |
1440 | ||
1441 | __release_region(parent, start, n); | |
1442 | WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match, | |
1443 | &match_data)); | |
1444 | } | |
1445 | EXPORT_SYMBOL(__devm_release_region); | |
1446 | ||
1da177e4 LT |
1447 | /* |
1448 | * Called from init/main.c to reserve IO ports. | |
1449 | */ | |
1450 | #define MAXRESERVE 4 | |
1451 | static int __init reserve_setup(char *str) | |
1452 | { | |
1453 | static int reserved; | |
1454 | static struct resource reserve[MAXRESERVE]; | |
1455 | ||
1456 | for (;;) { | |
8bc1ad7d | 1457 | unsigned int io_start, io_num; |
1da177e4 LT |
1458 | int x = reserved; |
1459 | ||
1460 | if (get_option (&str, &io_start) != 2) | |
1461 | break; | |
1462 | if (get_option (&str, &io_num) == 0) | |
1463 | break; | |
1464 | if (x < MAXRESERVE) { | |
1465 | struct resource *res = reserve + x; | |
1466 | res->name = "reserved"; | |
1467 | res->start = io_start; | |
1468 | res->end = io_start + io_num - 1; | |
1469 | res->flags = IORESOURCE_BUSY; | |
43ee493b | 1470 | res->desc = IORES_DESC_NONE; |
1da177e4 LT |
1471 | res->child = NULL; |
1472 | if (request_resource(res->start >= 0x10000 ? &iomem_resource : &ioport_resource, res) == 0) | |
1473 | reserved = x+1; | |
1474 | } | |
1475 | } | |
1476 | return 1; | |
1477 | } | |
1478 | ||
1479 | __setup("reserve=", reserve_setup); | |
379daf62 SS |
1480 | |
1481 | /* | |
1482 | * Check if the requested addr and size spans more than any slot in the | |
1483 | * iomem resource tree. | |
1484 | */ | |
1485 | int iomem_map_sanity_check(resource_size_t addr, unsigned long size) | |
1486 | { | |
1487 | struct resource *p = &iomem_resource; | |
1488 | int err = 0; | |
1489 | loff_t l; | |
1490 | ||
1491 | read_lock(&resource_lock); | |
1492 | for (p = p->child; p ; p = r_next(NULL, p, &l)) { | |
1493 | /* | |
1494 | * We can probably skip the resources without | |
1495 | * IORESOURCE_IO attribute? | |
1496 | */ | |
1497 | if (p->start >= addr + size) | |
1498 | continue; | |
1499 | if (p->end < addr) | |
1500 | continue; | |
d68612b2 SS |
1501 | if (PFN_DOWN(p->start) <= PFN_DOWN(addr) && |
1502 | PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1)) | |
379daf62 | 1503 | continue; |
3ac52669 AV |
1504 | /* |
1505 | * if a resource is "BUSY", it's not a hardware resource | |
1506 | * but a driver mapping of such a resource; we don't want | |
1507 | * to warn for those; some drivers legitimately map only | |
1508 | * partial hardware resources. (example: vesafb) | |
1509 | */ | |
1510 | if (p->flags & IORESOURCE_BUSY) | |
1511 | continue; | |
1512 | ||
e4c72966 | 1513 | printk(KERN_WARNING "resource sanity check: requesting [mem %#010llx-%#010llx], which spans more than %s %pR\n", |
13eb8375 IM |
1514 | (unsigned long long)addr, |
1515 | (unsigned long long)(addr + size - 1), | |
e4c72966 | 1516 | p->name, p); |
379daf62 SS |
1517 | err = -1; |
1518 | break; | |
1519 | } | |
1520 | read_unlock(&resource_lock); | |
1521 | ||
1522 | return err; | |
1523 | } | |
e8de1481 AV |
1524 | |
1525 | #ifdef CONFIG_STRICT_DEVMEM | |
1526 | static int strict_iomem_checks = 1; | |
1527 | #else | |
1528 | static int strict_iomem_checks; | |
1529 | #endif | |
1530 | ||
1531 | /* | |
1532 | * check if an address is reserved in the iomem resource tree | |
1533 | * returns 1 if reserved, 0 if not reserved. | |
1534 | */ | |
1535 | int iomem_is_exclusive(u64 addr) | |
1536 | { | |
1537 | struct resource *p = &iomem_resource; | |
1538 | int err = 0; | |
1539 | loff_t l; | |
1540 | int size = PAGE_SIZE; | |
1541 | ||
1542 | if (!strict_iomem_checks) | |
1543 | return 0; | |
1544 | ||
1545 | addr = addr & PAGE_MASK; | |
1546 | ||
1547 | read_lock(&resource_lock); | |
1548 | for (p = p->child; p ; p = r_next(NULL, p, &l)) { | |
1549 | /* | |
1550 | * We can probably skip the resources without | |
1551 | * IORESOURCE_IO attribute? | |
1552 | */ | |
1553 | if (p->start >= addr + size) | |
1554 | break; | |
1555 | if (p->end < addr) | |
1556 | continue; | |
90a545e9 DW |
1557 | /* |
1558 | * A resource is exclusive if IORESOURCE_EXCLUSIVE is set | |
1559 | * or CONFIG_IO_STRICT_DEVMEM is enabled and the | |
1560 | * resource is busy. | |
1561 | */ | |
1562 | if ((p->flags & IORESOURCE_BUSY) == 0) | |
1563 | continue; | |
1564 | if (IS_ENABLED(CONFIG_IO_STRICT_DEVMEM) | |
1565 | || p->flags & IORESOURCE_EXCLUSIVE) { | |
e8de1481 AV |
1566 | err = 1; |
1567 | break; | |
1568 | } | |
1569 | } | |
1570 | read_unlock(&resource_lock); | |
1571 | ||
1572 | return err; | |
1573 | } | |
1574 | ||
90e97820 JL |
1575 | struct resource_entry *resource_list_create_entry(struct resource *res, |
1576 | size_t extra_size) | |
1577 | { | |
1578 | struct resource_entry *entry; | |
1579 | ||
1580 | entry = kzalloc(sizeof(*entry) + extra_size, GFP_KERNEL); | |
1581 | if (entry) { | |
1582 | INIT_LIST_HEAD(&entry->node); | |
1583 | entry->res = res ? res : &entry->__res; | |
1584 | } | |
1585 | ||
1586 | return entry; | |
1587 | } | |
1588 | EXPORT_SYMBOL(resource_list_create_entry); | |
1589 | ||
1590 | void resource_list_free(struct list_head *head) | |
1591 | { | |
1592 | struct resource_entry *entry, *tmp; | |
1593 | ||
1594 | list_for_each_entry_safe(entry, tmp, head, node) | |
1595 | resource_list_destroy_entry(entry); | |
1596 | } | |
1597 | EXPORT_SYMBOL(resource_list_free); | |
1598 | ||
e8de1481 AV |
1599 | static int __init strict_iomem(char *str) |
1600 | { | |
1601 | if (strstr(str, "relaxed")) | |
1602 | strict_iomem_checks = 0; | |
1603 | if (strstr(str, "strict")) | |
1604 | strict_iomem_checks = 1; | |
1605 | return 1; | |
1606 | } | |
1607 | ||
1608 | __setup("iomem=", strict_iomem); |