]>
Commit | Line | Data |
---|---|---|
432d268c JN |
1 | /* |
2 | * Copyright (C) 2011 Citrix Ltd. | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
5 | * the COPYING file in the top-level directory. | |
6 | * | |
7 | */ | |
8 | ||
9 | #include "config.h" | |
10 | ||
11 | #include <sys/resource.h> | |
12 | ||
13 | #include "hw/xen_backend.h" | |
14 | #include "blockdev.h" | |
ea6c5f8f | 15 | #include "bitmap.h" |
432d268c JN |
16 | |
17 | #include <xen/hvm/params.h> | |
18 | #include <sys/mman.h> | |
19 | ||
20 | #include "xen-mapcache.h" | |
21 | #include "trace.h" | |
22 | ||
23 | ||
24 | //#define MAPCACHE_DEBUG | |
25 | ||
26 | #ifdef MAPCACHE_DEBUG | |
27 | # define DPRINTF(fmt, ...) do { \ | |
28 | fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \ | |
29 | } while (0) | |
30 | #else | |
31 | # define DPRINTF(fmt, ...) do { } while (0) | |
32 | #endif | |
33 | ||
34 | #if defined(__i386__) | |
35 | # define MCACHE_BUCKET_SHIFT 16 | |
ea6c5f8f | 36 | # define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */ |
432d268c JN |
37 | #elif defined(__x86_64__) |
38 | # define MCACHE_BUCKET_SHIFT 20 | |
ea6c5f8f | 39 | # define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */ |
432d268c JN |
40 | #endif |
41 | #define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT) | |
42 | ||
432d268c JN |
43 | typedef struct MapCacheEntry { |
44 | target_phys_addr_t paddr_index; | |
45 | uint8_t *vaddr_base; | |
c13390cd | 46 | unsigned long *valid_mapping; |
432d268c | 47 | uint8_t lock; |
c13390cd | 48 | target_phys_addr_t size; |
432d268c JN |
49 | struct MapCacheEntry *next; |
50 | } MapCacheEntry; | |
51 | ||
52 | typedef struct MapCacheRev { | |
53 | uint8_t *vaddr_req; | |
54 | target_phys_addr_t paddr_index; | |
c13390cd | 55 | target_phys_addr_t size; |
432d268c JN |
56 | QTAILQ_ENTRY(MapCacheRev) next; |
57 | } MapCacheRev; | |
58 | ||
59 | typedef struct MapCache { | |
60 | MapCacheEntry *entry; | |
61 | unsigned long nr_buckets; | |
62 | QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries; | |
63 | ||
64 | /* For most cases (>99.9%), the page address is the same. */ | |
65 | target_phys_addr_t last_address_index; | |
66 | uint8_t *last_address_vaddr; | |
67 | unsigned long max_mcache_size; | |
68 | unsigned int mcache_bucket_shift; | |
69 | } MapCache; | |
70 | ||
71 | static MapCache *mapcache; | |
72 | ||
c13390cd SS |
73 | static inline int test_bits(int nr, int size, const unsigned long *addr) |
74 | { | |
75 | unsigned long res = find_next_zero_bit(addr, size + nr, nr); | |
76 | if (res >= nr + size) | |
77 | return 1; | |
78 | else | |
79 | return 0; | |
80 | } | |
81 | ||
432d268c JN |
82 | void qemu_map_cache_init(void) |
83 | { | |
84 | unsigned long size; | |
85 | struct rlimit rlimit_as; | |
86 | ||
87 | mapcache = qemu_mallocz(sizeof (MapCache)); | |
88 | ||
89 | QTAILQ_INIT(&mapcache->locked_entries); | |
90 | mapcache->last_address_index = -1; | |
91 | ||
92 | getrlimit(RLIMIT_AS, &rlimit_as); | |
ea6c5f8f JB |
93 | if (rlimit_as.rlim_max < MCACHE_MAX_SIZE) { |
94 | rlimit_as.rlim_cur = rlimit_as.rlim_max; | |
95 | } else { | |
96 | rlimit_as.rlim_cur = MCACHE_MAX_SIZE; | |
97 | } | |
98 | ||
432d268c | 99 | setrlimit(RLIMIT_AS, &rlimit_as); |
ea6c5f8f | 100 | mapcache->max_mcache_size = rlimit_as.rlim_cur; |
432d268c JN |
101 | |
102 | mapcache->nr_buckets = | |
103 | (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) + | |
104 | (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >> | |
105 | (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)); | |
106 | ||
107 | size = mapcache->nr_buckets * sizeof (MapCacheEntry); | |
108 | size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1); | |
109 | DPRINTF("qemu_map_cache_init, nr_buckets = %lx size %lu\n", mapcache->nr_buckets, size); | |
110 | mapcache->entry = qemu_mallocz(size); | |
111 | } | |
112 | ||
113 | static void qemu_remap_bucket(MapCacheEntry *entry, | |
114 | target_phys_addr_t size, | |
115 | target_phys_addr_t address_index) | |
116 | { | |
117 | uint8_t *vaddr_base; | |
118 | xen_pfn_t *pfns; | |
119 | int *err; | |
ea6c5f8f | 120 | unsigned int i; |
432d268c JN |
121 | target_phys_addr_t nb_pfn = size >> XC_PAGE_SHIFT; |
122 | ||
123 | trace_qemu_remap_bucket(address_index); | |
124 | ||
125 | pfns = qemu_mallocz(nb_pfn * sizeof (xen_pfn_t)); | |
126 | err = qemu_mallocz(nb_pfn * sizeof (int)); | |
127 | ||
128 | if (entry->vaddr_base != NULL) { | |
c13390cd | 129 | if (munmap(entry->vaddr_base, entry->size) != 0) { |
432d268c JN |
130 | perror("unmap fails"); |
131 | exit(-1); | |
132 | } | |
133 | } | |
c13390cd SS |
134 | if (entry->valid_mapping != NULL) { |
135 | qemu_free(entry->valid_mapping); | |
136 | entry->valid_mapping = NULL; | |
137 | } | |
432d268c JN |
138 | |
139 | for (i = 0; i < nb_pfn; i++) { | |
140 | pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i; | |
141 | } | |
142 | ||
143 | vaddr_base = xc_map_foreign_bulk(xen_xc, xen_domid, PROT_READ|PROT_WRITE, | |
144 | pfns, err, nb_pfn); | |
145 | if (vaddr_base == NULL) { | |
146 | perror("xc_map_foreign_bulk"); | |
147 | exit(-1); | |
148 | } | |
149 | ||
150 | entry->vaddr_base = vaddr_base; | |
151 | entry->paddr_index = address_index; | |
c13390cd SS |
152 | entry->size = size; |
153 | entry->valid_mapping = (unsigned long *) qemu_mallocz(sizeof(unsigned long) * | |
154 | BITS_TO_LONGS(size >> XC_PAGE_SHIFT)); | |
432d268c | 155 | |
ea6c5f8f JB |
156 | bitmap_zero(entry->valid_mapping, nb_pfn); |
157 | for (i = 0; i < nb_pfn; i++) { | |
158 | if (!err[i]) { | |
159 | bitmap_set(entry->valid_mapping, i, 1); | |
432d268c | 160 | } |
432d268c JN |
161 | } |
162 | ||
163 | qemu_free(pfns); | |
164 | qemu_free(err); | |
165 | } | |
166 | ||
167 | uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, uint8_t lock) | |
168 | { | |
169 | MapCacheEntry *entry, *pentry = NULL; | |
170 | target_phys_addr_t address_index = phys_addr >> MCACHE_BUCKET_SHIFT; | |
171 | target_phys_addr_t address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1); | |
c13390cd | 172 | target_phys_addr_t __size = size; |
432d268c JN |
173 | |
174 | trace_qemu_map_cache(phys_addr); | |
175 | ||
c13390cd | 176 | if (address_index == mapcache->last_address_index && !lock && !__size) { |
432d268c JN |
177 | trace_qemu_map_cache_return(mapcache->last_address_vaddr + address_offset); |
178 | return mapcache->last_address_vaddr + address_offset; | |
179 | } | |
180 | ||
c13390cd SS |
181 | /* size is always a multiple of MCACHE_BUCKET_SIZE */ |
182 | if ((address_offset + (__size % MCACHE_BUCKET_SIZE)) > MCACHE_BUCKET_SIZE) | |
183 | __size += MCACHE_BUCKET_SIZE; | |
184 | if (__size % MCACHE_BUCKET_SIZE) | |
185 | __size += MCACHE_BUCKET_SIZE - (__size % MCACHE_BUCKET_SIZE); | |
186 | if (!__size) | |
187 | __size = MCACHE_BUCKET_SIZE; | |
188 | ||
432d268c JN |
189 | entry = &mapcache->entry[address_index % mapcache->nr_buckets]; |
190 | ||
c13390cd SS |
191 | while (entry && entry->lock && entry->vaddr_base && |
192 | (entry->paddr_index != address_index || entry->size != __size || | |
193 | !test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT, | |
194 | entry->valid_mapping))) { | |
432d268c JN |
195 | pentry = entry; |
196 | entry = entry->next; | |
197 | } | |
198 | if (!entry) { | |
199 | entry = qemu_mallocz(sizeof (MapCacheEntry)); | |
200 | pentry->next = entry; | |
c13390cd | 201 | qemu_remap_bucket(entry, __size, address_index); |
432d268c JN |
202 | } else if (!entry->lock) { |
203 | if (!entry->vaddr_base || entry->paddr_index != address_index || | |
c13390cd SS |
204 | entry->size != __size || |
205 | !test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT, | |
206 | entry->valid_mapping)) { | |
207 | qemu_remap_bucket(entry, __size, address_index); | |
432d268c JN |
208 | } |
209 | } | |
210 | ||
c13390cd SS |
211 | if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT, |
212 | entry->valid_mapping)) { | |
432d268c JN |
213 | mapcache->last_address_index = -1; |
214 | trace_qemu_map_cache_return(NULL); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | mapcache->last_address_index = address_index; | |
219 | mapcache->last_address_vaddr = entry->vaddr_base; | |
220 | if (lock) { | |
221 | MapCacheRev *reventry = qemu_mallocz(sizeof(MapCacheRev)); | |
222 | entry->lock++; | |
223 | reventry->vaddr_req = mapcache->last_address_vaddr + address_offset; | |
224 | reventry->paddr_index = mapcache->last_address_index; | |
c13390cd | 225 | reventry->size = entry->size; |
432d268c JN |
226 | QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next); |
227 | } | |
228 | ||
229 | trace_qemu_map_cache_return(mapcache->last_address_vaddr + address_offset); | |
230 | return mapcache->last_address_vaddr + address_offset; | |
231 | } | |
232 | ||
233 | ram_addr_t qemu_ram_addr_from_mapcache(void *ptr) | |
234 | { | |
c13390cd | 235 | MapCacheEntry *entry = NULL, *pentry = NULL; |
432d268c JN |
236 | MapCacheRev *reventry; |
237 | target_phys_addr_t paddr_index; | |
c13390cd | 238 | target_phys_addr_t size; |
432d268c JN |
239 | int found = 0; |
240 | ||
241 | QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) { | |
242 | if (reventry->vaddr_req == ptr) { | |
243 | paddr_index = reventry->paddr_index; | |
c13390cd | 244 | size = reventry->size; |
432d268c JN |
245 | found = 1; |
246 | break; | |
247 | } | |
248 | } | |
249 | if (!found) { | |
250 | fprintf(stderr, "qemu_ram_addr_from_mapcache, could not find %p\n", ptr); | |
251 | QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) { | |
252 | DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index, | |
253 | reventry->vaddr_req); | |
254 | } | |
255 | abort(); | |
256 | return 0; | |
257 | } | |
258 | ||
c13390cd SS |
259 | entry = &mapcache->entry[paddr_index % mapcache->nr_buckets]; |
260 | while (entry && (entry->paddr_index != paddr_index || entry->size != size)) { | |
261 | pentry = entry; | |
262 | entry = entry->next; | |
263 | } | |
264 | if (!entry) { | |
265 | DPRINTF("Trying to find address %p that is not in the mapcache!\n", ptr); | |
266 | return 0; | |
267 | } | |
268 | return (reventry->paddr_index << MCACHE_BUCKET_SHIFT) + | |
269 | ((unsigned long) ptr - (unsigned long) entry->vaddr_base); | |
432d268c JN |
270 | } |
271 | ||
272 | void qemu_invalidate_entry(uint8_t *buffer) | |
273 | { | |
274 | MapCacheEntry *entry = NULL, *pentry = NULL; | |
275 | MapCacheRev *reventry; | |
276 | target_phys_addr_t paddr_index; | |
c13390cd | 277 | target_phys_addr_t size; |
432d268c JN |
278 | int found = 0; |
279 | ||
280 | if (mapcache->last_address_vaddr == buffer) { | |
281 | mapcache->last_address_index = -1; | |
282 | } | |
283 | ||
284 | QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) { | |
285 | if (reventry->vaddr_req == buffer) { | |
286 | paddr_index = reventry->paddr_index; | |
c13390cd | 287 | size = reventry->size; |
432d268c JN |
288 | found = 1; |
289 | break; | |
290 | } | |
291 | } | |
292 | if (!found) { | |
293 | DPRINTF("qemu_invalidate_entry, could not find %p\n", buffer); | |
294 | QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) { | |
295 | DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index, reventry->vaddr_req); | |
296 | } | |
297 | return; | |
298 | } | |
299 | QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next); | |
300 | qemu_free(reventry); | |
301 | ||
302 | entry = &mapcache->entry[paddr_index % mapcache->nr_buckets]; | |
c13390cd | 303 | while (entry && (entry->paddr_index != paddr_index || entry->size != size)) { |
432d268c JN |
304 | pentry = entry; |
305 | entry = entry->next; | |
306 | } | |
307 | if (!entry) { | |
308 | DPRINTF("Trying to unmap address %p that is not in the mapcache!\n", buffer); | |
309 | return; | |
310 | } | |
311 | entry->lock--; | |
312 | if (entry->lock > 0 || pentry == NULL) { | |
313 | return; | |
314 | } | |
315 | ||
316 | pentry->next = entry->next; | |
c13390cd | 317 | if (munmap(entry->vaddr_base, entry->size) != 0) { |
432d268c JN |
318 | perror("unmap fails"); |
319 | exit(-1); | |
320 | } | |
c13390cd | 321 | qemu_free(entry->valid_mapping); |
432d268c JN |
322 | qemu_free(entry); |
323 | } | |
324 | ||
325 | void qemu_invalidate_map_cache(void) | |
326 | { | |
327 | unsigned long i; | |
328 | MapCacheRev *reventry; | |
329 | ||
330 | /* Flush pending AIO before destroying the mapcache */ | |
331 | qemu_aio_flush(); | |
332 | ||
333 | QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) { | |
334 | DPRINTF("There should be no locked mappings at this time, " | |
335 | "but "TARGET_FMT_plx" -> %p is present\n", | |
336 | reventry->paddr_index, reventry->vaddr_req); | |
337 | } | |
338 | ||
339 | mapcache_lock(); | |
340 | ||
341 | for (i = 0; i < mapcache->nr_buckets; i++) { | |
342 | MapCacheEntry *entry = &mapcache->entry[i]; | |
343 | ||
344 | if (entry->vaddr_base == NULL) { | |
345 | continue; | |
346 | } | |
347 | ||
c13390cd | 348 | if (munmap(entry->vaddr_base, entry->size) != 0) { |
432d268c JN |
349 | perror("unmap fails"); |
350 | exit(-1); | |
351 | } | |
352 | ||
353 | entry->paddr_index = 0; | |
354 | entry->vaddr_base = NULL; | |
c13390cd SS |
355 | entry->size = 0; |
356 | qemu_free(entry->valid_mapping); | |
357 | entry->valid_mapping = NULL; | |
432d268c JN |
358 | } |
359 | ||
360 | mapcache->last_address_index = -1; | |
361 | mapcache->last_address_vaddr = NULL; | |
362 | ||
363 | mapcache_unlock(); | |
364 | } |