Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/power/swap.c |
| 3 | * |
| 4 | * This file provides functions for reading the suspend image from |
| 5 | * and writing it to a swap partition. |
| 6 | * |
Pavel Machek | a253129 | 2010-07-18 14:27:13 +0200 | [diff] [blame] | 7 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 8 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 9 | * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 10 | * |
| 11 | * This file is released under the GPLv2. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 16 | #include <linux/file.h> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 17 | #include <linux/delay.h> |
| 18 | #include <linux/bitops.h> |
| 19 | #include <linux/genhd.h> |
| 20 | #include <linux/device.h> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 21 | #include <linux/bio.h> |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 22 | #include <linux/blkdev.h> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 23 | #include <linux/swap.h> |
| 24 | #include <linux/swapops.h> |
| 25 | #include <linux/pm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 27 | #include <linux/lzo.h> |
| 28 | #include <linux/vmalloc.h> |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 29 | #include <linux/cpumask.h> |
| 30 | #include <linux/atomic.h> |
| 31 | #include <linux/kthread.h> |
| 32 | #include <linux/crc32.h> |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 33 | |
| 34 | #include "power.h" |
| 35 | |
Rafael J. Wysocki | be8cd64 | 2010-12-11 21:46:44 +0100 | [diff] [blame] | 36 | #define HIBERNATE_SIG "S1SUSPEND" |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 37 | |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 38 | /* |
| 39 | * The swap map is a data structure used for keeping track of each page |
| 40 | * written to a swap partition. It consists of many swap_map_page |
Cesar Eduardo Barros | 9013367 | 2010-06-07 22:23:12 +0200 | [diff] [blame] | 41 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 42 | * These structures are stored on the swap and linked together with the |
| 43 | * help of the .next_swap member. |
| 44 | * |
| 45 | * The swap map is created during suspend. The swap map pages are |
| 46 | * allocated and populated one at a time, so we only need one memory |
| 47 | * page to set up the entire structure. |
| 48 | * |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 49 | * During resume we pick up all swap_map_page structures into a list. |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 50 | */ |
| 51 | |
| 52 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) |
| 53 | |
Bojan Smojver | f8262d4 | 2012-04-24 23:53:28 +0200 | [diff] [blame] | 54 | /* |
| 55 | * Number of free pages that are not high. |
| 56 | */ |
| 57 | static inline unsigned long low_free_pages(void) |
| 58 | { |
| 59 | return nr_free_pages() - nr_free_highpages(); |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * Number of pages required to be kept free while writing the image. Always |
| 64 | * half of all available low pages before the writing starts. |
| 65 | */ |
| 66 | static inline unsigned long reqd_free_pages(void) |
| 67 | { |
| 68 | return low_free_pages() / 2; |
| 69 | } |
| 70 | |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 71 | struct swap_map_page { |
| 72 | sector_t entries[MAP_PAGE_ENTRIES]; |
| 73 | sector_t next_swap; |
| 74 | }; |
| 75 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 76 | struct swap_map_page_list { |
| 77 | struct swap_map_page *map; |
| 78 | struct swap_map_page_list *next; |
| 79 | }; |
| 80 | |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 81 | /** |
| 82 | * The swap_map_handle structure is used for handling swap in |
| 83 | * a file-alike way |
| 84 | */ |
| 85 | |
| 86 | struct swap_map_handle { |
| 87 | struct swap_map_page *cur; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 88 | struct swap_map_page_list *maps; |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 89 | sector_t cur_swap; |
| 90 | sector_t first_sector; |
| 91 | unsigned int k; |
Bojan Smojver | f8262d4 | 2012-04-24 23:53:28 +0200 | [diff] [blame] | 92 | unsigned long reqd_free_pages; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 93 | u32 crc32; |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 94 | }; |
| 95 | |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 96 | struct swsusp_header { |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 97 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
| 98 | sizeof(u32)]; |
| 99 | u32 crc32; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 100 | sector_t image; |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 101 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 102 | char orig_sig[10]; |
| 103 | char sig[10]; |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 104 | } __attribute__((packed)); |
| 105 | |
| 106 | static struct swsusp_header *swsusp_header; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 107 | |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 108 | /** |
| 109 | * The following functions are used for tracing the allocated |
| 110 | * swap pages, so that they can be freed in case of an error. |
| 111 | */ |
| 112 | |
| 113 | struct swsusp_extent { |
| 114 | struct rb_node node; |
| 115 | unsigned long start; |
| 116 | unsigned long end; |
| 117 | }; |
| 118 | |
| 119 | static struct rb_root swsusp_extents = RB_ROOT; |
| 120 | |
| 121 | static int swsusp_extents_insert(unsigned long swap_offset) |
| 122 | { |
| 123 | struct rb_node **new = &(swsusp_extents.rb_node); |
| 124 | struct rb_node *parent = NULL; |
| 125 | struct swsusp_extent *ext; |
| 126 | |
| 127 | /* Figure out where to put the new node */ |
| 128 | while (*new) { |
Davidlohr Bueso | 8316bd7 | 2012-10-23 01:21:09 +0200 | [diff] [blame] | 129 | ext = rb_entry(*new, struct swsusp_extent, node); |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 130 | parent = *new; |
| 131 | if (swap_offset < ext->start) { |
| 132 | /* Try to merge */ |
| 133 | if (swap_offset == ext->start - 1) { |
| 134 | ext->start--; |
| 135 | return 0; |
| 136 | } |
| 137 | new = &((*new)->rb_left); |
| 138 | } else if (swap_offset > ext->end) { |
| 139 | /* Try to merge */ |
| 140 | if (swap_offset == ext->end + 1) { |
| 141 | ext->end++; |
| 142 | return 0; |
| 143 | } |
| 144 | new = &((*new)->rb_right); |
| 145 | } else { |
| 146 | /* It already is in the tree */ |
| 147 | return -EINVAL; |
| 148 | } |
| 149 | } |
| 150 | /* Add the new node and rebalance the tree. */ |
| 151 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); |
| 152 | if (!ext) |
| 153 | return -ENOMEM; |
| 154 | |
| 155 | ext->start = swap_offset; |
| 156 | ext->end = swap_offset; |
| 157 | rb_link_node(&ext->node, parent, new); |
| 158 | rb_insert_color(&ext->node, &swsusp_extents); |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * alloc_swapdev_block - allocate a swap page and register that it has |
| 164 | * been allocated, so that it can be freed in case of an error. |
| 165 | */ |
| 166 | |
| 167 | sector_t alloc_swapdev_block(int swap) |
| 168 | { |
| 169 | unsigned long offset; |
| 170 | |
Hugh Dickins | 910321e | 2010-09-09 16:38:07 -0700 | [diff] [blame] | 171 | offset = swp_offset(get_swap_page_of_type(swap)); |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 172 | if (offset) { |
| 173 | if (swsusp_extents_insert(offset)) |
Hugh Dickins | 910321e | 2010-09-09 16:38:07 -0700 | [diff] [blame] | 174 | swap_free(swp_entry(swap, offset)); |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 175 | else |
| 176 | return swapdev_block(swap, offset); |
| 177 | } |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * free_all_swap_pages - free swap pages allocated for saving image data. |
Cesar Eduardo Barros | 9013367 | 2010-06-07 22:23:12 +0200 | [diff] [blame] | 183 | * It also frees the extents used to register which swap entries had been |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 184 | * allocated. |
| 185 | */ |
| 186 | |
| 187 | void free_all_swap_pages(int swap) |
| 188 | { |
| 189 | struct rb_node *node; |
| 190 | |
| 191 | while ((node = swsusp_extents.rb_node)) { |
| 192 | struct swsusp_extent *ext; |
| 193 | unsigned long offset; |
| 194 | |
| 195 | ext = container_of(node, struct swsusp_extent, node); |
| 196 | rb_erase(node, &swsusp_extents); |
| 197 | for (offset = ext->start; offset <= ext->end; offset++) |
Hugh Dickins | 910321e | 2010-09-09 16:38:07 -0700 | [diff] [blame] | 198 | swap_free(swp_entry(swap, offset)); |
Nigel Cunningham | 0414f2e | 2009-12-06 16:15:53 +0100 | [diff] [blame] | 199 | |
| 200 | kfree(ext); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | int swsusp_swap_in_use(void) |
| 205 | { |
| 206 | return (swsusp_extents.rb_node != NULL); |
| 207 | } |
| 208 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 209 | /* |
Rafael J. Wysocki | 3fc6b34 | 2006-12-06 20:34:09 -0800 | [diff] [blame] | 210 | * General things |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 211 | */ |
| 212 | |
| 213 | static unsigned short root_swap = 0xffff; |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 214 | struct block_device *hib_resume_bdev; |
Rafael J. Wysocki | 3fc6b34 | 2006-12-06 20:34:09 -0800 | [diff] [blame] | 215 | |
Rafael J. Wysocki | 3fc6b34 | 2006-12-06 20:34:09 -0800 | [diff] [blame] | 216 | /* |
| 217 | * Saving part |
| 218 | */ |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 219 | |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 220 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 221 | { |
| 222 | int error; |
| 223 | |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 224 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 225 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
| 226 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { |
| 227 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); |
Rafael J. Wysocki | 3624eb0 | 2010-10-04 22:08:12 +0200 | [diff] [blame] | 228 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 229 | swsusp_header->image = handle->first_sector; |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 230 | swsusp_header->flags = flags; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 231 | if (flags & SF_CRC32_MODE) |
| 232 | swsusp_header->crc32 = handle->crc32; |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 233 | error = hib_bio_write_page(swsusp_resume_block, |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 234 | swsusp_header, NULL); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 235 | } else { |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 236 | printk(KERN_ERR "PM: Swap header not found!\n"); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 237 | error = -ENODEV; |
| 238 | } |
| 239 | return error; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * swsusp_swap_check - check if the resume device is a swap device |
| 244 | * and get its index (if so) |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 245 | * |
| 246 | * This is called before saving image |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 247 | */ |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 248 | static int swsusp_swap_check(void) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 249 | { |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 250 | int res; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 251 | |
Rafael J. Wysocki | 7bf2368 | 2007-01-05 16:36:28 -0800 | [diff] [blame] | 252 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 253 | &hib_resume_bdev); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 254 | if (res < 0) |
| 255 | return res; |
| 256 | |
| 257 | root_swap = res; |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 258 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
Rafael J. Wysocki | 7bf2368 | 2007-01-05 16:36:28 -0800 | [diff] [blame] | 259 | if (res) |
| 260 | return res; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 261 | |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 262 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 263 | if (res < 0) |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 264 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 265 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 266 | return res; |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * write_page - Write one page to given swap location. |
| 271 | * @buf: Address we're writing. |
| 272 | * @offset: Offset of the swap page we're writing to. |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 273 | * @bio_chain: Link the next write BIO here |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 274 | */ |
| 275 | |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 276 | static int write_page(void *buf, sector_t offset, struct bio **bio_chain) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 277 | { |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 278 | void *src; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 279 | int ret; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 280 | |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 281 | if (!offset) |
| 282 | return -ENOSPC; |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 283 | |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 284 | if (bio_chain) { |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 285 | src = (void *)__get_free_page(__GFP_WAIT | __GFP_NOWARN | |
| 286 | __GFP_NORETRY); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 287 | if (src) { |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 288 | copy_page(src, buf); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 289 | } else { |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 290 | ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */ |
| 291 | if (ret) |
| 292 | return ret; |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 293 | src = (void *)__get_free_page(__GFP_WAIT | |
| 294 | __GFP_NOWARN | |
| 295 | __GFP_NORETRY); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 296 | if (src) { |
| 297 | copy_page(src, buf); |
| 298 | } else { |
| 299 | WARN_ON_ONCE(1); |
| 300 | bio_chain = NULL; /* Go synchronous */ |
| 301 | src = buf; |
| 302 | } |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 303 | } |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 304 | } else { |
| 305 | src = buf; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 306 | } |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 307 | return hib_bio_write_page(offset, src, bio_chain); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 308 | } |
| 309 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 310 | static void release_swap_writer(struct swap_map_handle *handle) |
| 311 | { |
| 312 | if (handle->cur) |
| 313 | free_page((unsigned long)handle->cur); |
| 314 | handle->cur = NULL; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | static int get_swap_writer(struct swap_map_handle *handle) |
| 318 | { |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 319 | int ret; |
| 320 | |
| 321 | ret = swsusp_swap_check(); |
| 322 | if (ret) { |
| 323 | if (ret != -ENOSPC) |
| 324 | printk(KERN_ERR "PM: Cannot find swap device, try " |
| 325 | "swapon -a.\n"); |
| 326 | return ret; |
| 327 | } |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 328 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 329 | if (!handle->cur) { |
| 330 | ret = -ENOMEM; |
| 331 | goto err_close; |
| 332 | } |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 333 | handle->cur_swap = alloc_swapdev_block(root_swap); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 334 | if (!handle->cur_swap) { |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 335 | ret = -ENOSPC; |
| 336 | goto err_rel; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 337 | } |
| 338 | handle->k = 0; |
Bojan Smojver | f8262d4 | 2012-04-24 23:53:28 +0200 | [diff] [blame] | 339 | handle->reqd_free_pages = reqd_free_pages(); |
Jiri Slaby | 51fb352 | 2010-05-01 23:53:02 +0200 | [diff] [blame] | 340 | handle->first_sector = handle->cur_swap; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 341 | return 0; |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 342 | err_rel: |
| 343 | release_swap_writer(handle); |
| 344 | err_close: |
| 345 | swsusp_close(FMODE_WRITE); |
| 346 | return ret; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 347 | } |
| 348 | |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 349 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
| 350 | struct bio **bio_chain) |
| 351 | { |
| 352 | int error = 0; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 353 | sector_t offset; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 354 | |
| 355 | if (!handle->cur) |
| 356 | return -EINVAL; |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 357 | offset = alloc_swapdev_block(root_swap); |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 358 | error = write_page(buf, offset, bio_chain); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 359 | if (error) |
| 360 | return error; |
| 361 | handle->cur->entries[handle->k++] = offset; |
| 362 | if (handle->k >= MAP_PAGE_ENTRIES) { |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 363 | offset = alloc_swapdev_block(root_swap); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 364 | if (!offset) |
| 365 | return -ENOSPC; |
| 366 | handle->cur->next_swap = offset; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 367 | error = write_page(handle->cur, handle->cur_swap, bio_chain); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 368 | if (error) |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 369 | goto out; |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 370 | clear_page(handle->cur); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 371 | handle->cur_swap = offset; |
| 372 | handle->k = 0; |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 373 | |
| 374 | if (bio_chain && low_free_pages() <= handle->reqd_free_pages) { |
| 375 | error = hib_wait_on_bio_chain(bio_chain); |
| 376 | if (error) |
| 377 | goto out; |
| 378 | /* |
| 379 | * Recalculate the number of required free pages, to |
| 380 | * make sure we never take more than half. |
| 381 | */ |
| 382 | handle->reqd_free_pages = reqd_free_pages(); |
| 383 | } |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 384 | } |
Rafael J. Wysocki | 59a49335 | 2006-12-06 20:34:44 -0800 | [diff] [blame] | 385 | out: |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 386 | return error; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | static int flush_swap_writer(struct swap_map_handle *handle) |
| 390 | { |
| 391 | if (handle->cur && handle->cur_swap) |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 392 | return write_page(handle->cur, handle->cur_swap, NULL); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 393 | else |
| 394 | return -EINVAL; |
| 395 | } |
| 396 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 397 | static int swap_writer_finish(struct swap_map_handle *handle, |
| 398 | unsigned int flags, int error) |
| 399 | { |
| 400 | if (!error) { |
| 401 | flush_swap_writer(handle); |
| 402 | printk(KERN_INFO "PM: S"); |
| 403 | error = mark_swapfiles(handle, flags); |
| 404 | printk("|\n"); |
| 405 | } |
| 406 | |
| 407 | if (error) |
| 408 | free_all_swap_pages(root_swap); |
| 409 | release_swap_writer(handle); |
| 410 | swsusp_close(FMODE_WRITE); |
| 411 | |
| 412 | return error; |
| 413 | } |
| 414 | |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 415 | /* We need to remember how much compressed data we need to read. */ |
| 416 | #define LZO_HEADER sizeof(size_t) |
| 417 | |
| 418 | /* Number of pages/bytes we'll compress at one time. */ |
| 419 | #define LZO_UNC_PAGES 32 |
| 420 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) |
| 421 | |
| 422 | /* Number of pages/bytes we need for compressed data (worst case). */ |
| 423 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ |
| 424 | LZO_HEADER, PAGE_SIZE) |
| 425 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) |
| 426 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 427 | /* Maximum number of threads for compression/decompression. */ |
| 428 | #define LZO_THREADS 3 |
| 429 | |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 430 | /* Minimum/maximum number of pages for read buffering. */ |
| 431 | #define LZO_MIN_RD_PAGES 1024 |
| 432 | #define LZO_MAX_RD_PAGES 8192 |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 433 | |
| 434 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 435 | /** |
| 436 | * save_image - save the suspend image data |
| 437 | */ |
| 438 | |
| 439 | static int save_image(struct swap_map_handle *handle, |
| 440 | struct snapshot_handle *snapshot, |
Andrew Morton | 3a4f757 | 2006-09-25 23:32:41 -0700 | [diff] [blame] | 441 | unsigned int nr_to_write) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 442 | { |
| 443 | unsigned int m; |
| 444 | int ret; |
Andrew Morton | 3a4f757 | 2006-09-25 23:32:41 -0700 | [diff] [blame] | 445 | int nr_pages; |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 446 | int err2; |
| 447 | struct bio *bio; |
Andrew Morton | 3a4f757 | 2006-09-25 23:32:41 -0700 | [diff] [blame] | 448 | struct timeval start; |
| 449 | struct timeval stop; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 450 | |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 451 | printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n", |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 452 | nr_to_write); |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 453 | m = nr_to_write / 10; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 454 | if (!m) |
| 455 | m = 1; |
| 456 | nr_pages = 0; |
Andrew Morton | ab95416 | 2006-09-25 23:32:42 -0700 | [diff] [blame] | 457 | bio = NULL; |
Andrew Morton | 3a4f757 | 2006-09-25 23:32:41 -0700 | [diff] [blame] | 458 | do_gettimeofday(&start); |
Jiri Slaby | 4ff277f | 2009-10-28 22:55:33 +0100 | [diff] [blame] | 459 | while (1) { |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 460 | ret = snapshot_read_next(snapshot); |
Jiri Slaby | 4ff277f | 2009-10-28 22:55:33 +0100 | [diff] [blame] | 461 | if (ret <= 0) |
| 462 | break; |
| 463 | ret = swap_write_page(handle, data_of(*snapshot), &bio); |
| 464 | if (ret) |
| 465 | break; |
| 466 | if (!(nr_pages % m)) |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 467 | printk(KERN_INFO "PM: Image saving progress: %3d%%\n", |
| 468 | nr_pages / m * 10); |
Jiri Slaby | 4ff277f | 2009-10-28 22:55:33 +0100 | [diff] [blame] | 469 | nr_pages++; |
| 470 | } |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 471 | err2 = hib_wait_on_bio_chain(&bio); |
Andrew Morton | 3a4f757 | 2006-09-25 23:32:41 -0700 | [diff] [blame] | 472 | do_gettimeofday(&stop); |
Jiri Slaby | 4ff277f | 2009-10-28 22:55:33 +0100 | [diff] [blame] | 473 | if (!ret) |
| 474 | ret = err2; |
| 475 | if (!ret) |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 476 | printk(KERN_INFO "PM: Image saving done.\n"); |
Rafael J. Wysocki | 0d3a9ab | 2006-12-06 20:34:32 -0800 | [diff] [blame] | 477 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
Jiri Slaby | 4ff277f | 2009-10-28 22:55:33 +0100 | [diff] [blame] | 478 | return ret; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 479 | } |
| 480 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 481 | /** |
| 482 | * Structure used for CRC32. |
| 483 | */ |
| 484 | struct crc_data { |
| 485 | struct task_struct *thr; /* thread */ |
| 486 | atomic_t ready; /* ready to start flag */ |
| 487 | atomic_t stop; /* ready to stop flag */ |
| 488 | unsigned run_threads; /* nr current threads */ |
| 489 | wait_queue_head_t go; /* start crc update */ |
| 490 | wait_queue_head_t done; /* crc update done */ |
| 491 | u32 *crc32; /* points to handle's crc32 */ |
| 492 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ |
| 493 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ |
| 494 | }; |
| 495 | |
| 496 | /** |
| 497 | * CRC32 update function that runs in its own thread. |
| 498 | */ |
| 499 | static int crc32_threadfn(void *data) |
| 500 | { |
| 501 | struct crc_data *d = data; |
| 502 | unsigned i; |
| 503 | |
| 504 | while (1) { |
| 505 | wait_event(d->go, atomic_read(&d->ready) || |
| 506 | kthread_should_stop()); |
| 507 | if (kthread_should_stop()) { |
| 508 | d->thr = NULL; |
| 509 | atomic_set(&d->stop, 1); |
| 510 | wake_up(&d->done); |
| 511 | break; |
| 512 | } |
| 513 | atomic_set(&d->ready, 0); |
| 514 | |
| 515 | for (i = 0; i < d->run_threads; i++) |
| 516 | *d->crc32 = crc32_le(*d->crc32, |
| 517 | d->unc[i], *d->unc_len[i]); |
| 518 | atomic_set(&d->stop, 1); |
| 519 | wake_up(&d->done); |
| 520 | } |
| 521 | return 0; |
| 522 | } |
| 523 | /** |
| 524 | * Structure used for LZO data compression. |
| 525 | */ |
| 526 | struct cmp_data { |
| 527 | struct task_struct *thr; /* thread */ |
| 528 | atomic_t ready; /* ready to start flag */ |
| 529 | atomic_t stop; /* ready to stop flag */ |
| 530 | int ret; /* return code */ |
| 531 | wait_queue_head_t go; /* start compression */ |
| 532 | wait_queue_head_t done; /* compression done */ |
| 533 | size_t unc_len; /* uncompressed length */ |
| 534 | size_t cmp_len; /* compressed length */ |
| 535 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ |
| 536 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ |
| 537 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ |
| 538 | }; |
| 539 | |
| 540 | /** |
| 541 | * Compression function that runs in its own thread. |
| 542 | */ |
| 543 | static int lzo_compress_threadfn(void *data) |
| 544 | { |
| 545 | struct cmp_data *d = data; |
| 546 | |
| 547 | while (1) { |
| 548 | wait_event(d->go, atomic_read(&d->ready) || |
| 549 | kthread_should_stop()); |
| 550 | if (kthread_should_stop()) { |
| 551 | d->thr = NULL; |
| 552 | d->ret = -1; |
| 553 | atomic_set(&d->stop, 1); |
| 554 | wake_up(&d->done); |
| 555 | break; |
| 556 | } |
| 557 | atomic_set(&d->ready, 0); |
| 558 | |
| 559 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, |
| 560 | d->cmp + LZO_HEADER, &d->cmp_len, |
| 561 | d->wrk); |
| 562 | atomic_set(&d->stop, 1); |
| 563 | wake_up(&d->done); |
| 564 | } |
| 565 | return 0; |
| 566 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 567 | |
| 568 | /** |
| 569 | * save_image_lzo - Save the suspend image data compressed with LZO. |
| 570 | * @handle: Swap mam handle to use for saving the image. |
| 571 | * @snapshot: Image to read data from. |
| 572 | * @nr_to_write: Number of pages to save. |
| 573 | */ |
| 574 | static int save_image_lzo(struct swap_map_handle *handle, |
| 575 | struct snapshot_handle *snapshot, |
| 576 | unsigned int nr_to_write) |
| 577 | { |
| 578 | unsigned int m; |
| 579 | int ret = 0; |
| 580 | int nr_pages; |
| 581 | int err2; |
| 582 | struct bio *bio; |
| 583 | struct timeval start; |
| 584 | struct timeval stop; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 585 | size_t off; |
| 586 | unsigned thr, run_threads, nr_threads; |
| 587 | unsigned char *page = NULL; |
| 588 | struct cmp_data *data = NULL; |
| 589 | struct crc_data *crc = NULL; |
| 590 | |
| 591 | /* |
| 592 | * We'll limit the number of threads for compression to limit memory |
| 593 | * footprint. |
| 594 | */ |
| 595 | nr_threads = num_online_cpus() - 1; |
| 596 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 597 | |
| 598 | page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); |
| 599 | if (!page) { |
| 600 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 601 | ret = -ENOMEM; |
| 602 | goto out_clean; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 603 | } |
| 604 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 605 | data = vmalloc(sizeof(*data) * nr_threads); |
| 606 | if (!data) { |
| 607 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); |
| 608 | ret = -ENOMEM; |
| 609 | goto out_clean; |
| 610 | } |
| 611 | for (thr = 0; thr < nr_threads; thr++) |
| 612 | memset(&data[thr], 0, offsetof(struct cmp_data, go)); |
| 613 | |
| 614 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
| 615 | if (!crc) { |
| 616 | printk(KERN_ERR "PM: Failed to allocate crc\n"); |
| 617 | ret = -ENOMEM; |
| 618 | goto out_clean; |
| 619 | } |
| 620 | memset(crc, 0, offsetof(struct crc_data, go)); |
| 621 | |
| 622 | /* |
| 623 | * Start the compression threads. |
| 624 | */ |
| 625 | for (thr = 0; thr < nr_threads; thr++) { |
| 626 | init_waitqueue_head(&data[thr].go); |
| 627 | init_waitqueue_head(&data[thr].done); |
| 628 | |
| 629 | data[thr].thr = kthread_run(lzo_compress_threadfn, |
| 630 | &data[thr], |
| 631 | "image_compress/%u", thr); |
| 632 | if (IS_ERR(data[thr].thr)) { |
| 633 | data[thr].thr = NULL; |
| 634 | printk(KERN_ERR |
| 635 | "PM: Cannot start compression threads\n"); |
| 636 | ret = -ENOMEM; |
| 637 | goto out_clean; |
| 638 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 639 | } |
| 640 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 641 | /* |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 642 | * Start the CRC32 thread. |
| 643 | */ |
| 644 | init_waitqueue_head(&crc->go); |
| 645 | init_waitqueue_head(&crc->done); |
| 646 | |
| 647 | handle->crc32 = 0; |
| 648 | crc->crc32 = &handle->crc32; |
| 649 | for (thr = 0; thr < nr_threads; thr++) { |
| 650 | crc->unc[thr] = data[thr].unc; |
| 651 | crc->unc_len[thr] = &data[thr].unc_len; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 652 | } |
| 653 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 654 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
| 655 | if (IS_ERR(crc->thr)) { |
| 656 | crc->thr = NULL; |
| 657 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); |
| 658 | ret = -ENOMEM; |
| 659 | goto out_clean; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 660 | } |
| 661 | |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 662 | /* |
| 663 | * Adjust the number of required free pages after all allocations have |
| 664 | * been done. We don't want to run out of pages when writing. |
| 665 | */ |
| 666 | handle->reqd_free_pages = reqd_free_pages(); |
| 667 | |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 668 | printk(KERN_INFO |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 669 | "PM: Using %u thread(s) for compression.\n" |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 670 | "PM: Compressing and saving image data (%u pages)...\n", |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 671 | nr_threads, nr_to_write); |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 672 | m = nr_to_write / 10; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 673 | if (!m) |
| 674 | m = 1; |
| 675 | nr_pages = 0; |
| 676 | bio = NULL; |
| 677 | do_gettimeofday(&start); |
| 678 | for (;;) { |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 679 | for (thr = 0; thr < nr_threads; thr++) { |
| 680 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { |
| 681 | ret = snapshot_read_next(snapshot); |
| 682 | if (ret < 0) |
| 683 | goto out_finish; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 684 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 685 | if (!ret) |
| 686 | break; |
| 687 | |
| 688 | memcpy(data[thr].unc + off, |
| 689 | data_of(*snapshot), PAGE_SIZE); |
| 690 | |
| 691 | if (!(nr_pages % m)) |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 692 | printk(KERN_INFO |
| 693 | "PM: Image saving progress: " |
| 694 | "%3d%%\n", |
| 695 | nr_pages / m * 10); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 696 | nr_pages++; |
| 697 | } |
| 698 | if (!off) |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 699 | break; |
| 700 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 701 | data[thr].unc_len = off; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 702 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 703 | atomic_set(&data[thr].ready, 1); |
| 704 | wake_up(&data[thr].go); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 705 | } |
| 706 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 707 | if (!thr) |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 708 | break; |
| 709 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 710 | crc->run_threads = thr; |
| 711 | atomic_set(&crc->ready, 1); |
| 712 | wake_up(&crc->go); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 713 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 714 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
| 715 | wait_event(data[thr].done, |
| 716 | atomic_read(&data[thr].stop)); |
| 717 | atomic_set(&data[thr].stop, 0); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 718 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 719 | ret = data[thr].ret; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 720 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 721 | if (ret < 0) { |
| 722 | printk(KERN_ERR "PM: LZO compression failed\n"); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 723 | goto out_finish; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | if (unlikely(!data[thr].cmp_len || |
| 727 | data[thr].cmp_len > |
| 728 | lzo1x_worst_compress(data[thr].unc_len))) { |
| 729 | printk(KERN_ERR |
| 730 | "PM: Invalid LZO compressed length\n"); |
| 731 | ret = -1; |
| 732 | goto out_finish; |
| 733 | } |
| 734 | |
| 735 | *(size_t *)data[thr].cmp = data[thr].cmp_len; |
| 736 | |
| 737 | /* |
| 738 | * Given we are writing one page at a time to disk, we |
| 739 | * copy that much from the buffer, although the last |
| 740 | * bit will likely be smaller than full page. This is |
| 741 | * OK - we saved the length of the compressed data, so |
| 742 | * any garbage at the end will be discarded when we |
| 743 | * read it. |
| 744 | */ |
| 745 | for (off = 0; |
| 746 | off < LZO_HEADER + data[thr].cmp_len; |
| 747 | off += PAGE_SIZE) { |
| 748 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); |
| 749 | |
| 750 | ret = swap_write_page(handle, page, &bio); |
| 751 | if (ret) |
| 752 | goto out_finish; |
| 753 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 754 | } |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 755 | |
| 756 | wait_event(crc->done, atomic_read(&crc->stop)); |
| 757 | atomic_set(&crc->stop, 0); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | out_finish: |
| 761 | err2 = hib_wait_on_bio_chain(&bio); |
| 762 | do_gettimeofday(&stop); |
| 763 | if (!ret) |
| 764 | ret = err2; |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 765 | if (!ret) |
| 766 | printk(KERN_INFO "PM: Image saving done.\n"); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 767 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 768 | out_clean: |
| 769 | if (crc) { |
| 770 | if (crc->thr) |
| 771 | kthread_stop(crc->thr); |
| 772 | kfree(crc); |
| 773 | } |
| 774 | if (data) { |
| 775 | for (thr = 0; thr < nr_threads; thr++) |
| 776 | if (data[thr].thr) |
| 777 | kthread_stop(data[thr].thr); |
| 778 | vfree(data); |
| 779 | } |
| 780 | if (page) free_page((unsigned long)page); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 781 | |
| 782 | return ret; |
| 783 | } |
| 784 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 785 | /** |
| 786 | * enough_swap - Make sure we have enough swap to save the image. |
| 787 | * |
| 788 | * Returns TRUE or FALSE after checking the total amount of swap |
| 789 | * space avaiable from the resume partition. |
| 790 | */ |
| 791 | |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 792 | static int enough_swap(unsigned int nr_pages, unsigned int flags) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 793 | { |
| 794 | unsigned int free_swap = count_swap_pages(root_swap, 1); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 795 | unsigned int required; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 796 | |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 797 | pr_debug("PM: Free swap pages: %u\n", free_swap); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 798 | |
Barry Song | ee34a37 | 2012-01-09 12:56:23 +0800 | [diff] [blame] | 799 | required = PAGES_FOR_IO + nr_pages; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 800 | return free_swap > required; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | /** |
| 804 | * swsusp_write - Write entire image and metadata. |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 805 | * @flags: flags to pass to the "boot" kernel in the image header |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 806 | * |
| 807 | * It is important _NOT_ to umount filesystems at this point. We want |
| 808 | * them synced (in case something goes wrong) but we DO not want to mark |
| 809 | * filesystem clean: it is not. (And it does not matter, if we resume |
| 810 | * correctly, we'll mark system clean, anyway.) |
| 811 | */ |
| 812 | |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 813 | int swsusp_write(unsigned int flags) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 814 | { |
| 815 | struct swap_map_handle handle; |
| 816 | struct snapshot_handle snapshot; |
| 817 | struct swsusp_info *header; |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 818 | unsigned long pages; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 819 | int error; |
| 820 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 821 | pages = snapshot_get_image_size(); |
| 822 | error = get_swap_writer(&handle); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 823 | if (error) { |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 824 | printk(KERN_ERR "PM: Cannot get swap writer\n"); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 825 | return error; |
| 826 | } |
Barry Song | ee34a37 | 2012-01-09 12:56:23 +0800 | [diff] [blame] | 827 | if (flags & SF_NOCOMPRESS_MODE) { |
| 828 | if (!enough_swap(pages, flags)) { |
| 829 | printk(KERN_ERR "PM: Not enough free swap\n"); |
| 830 | error = -ENOSPC; |
| 831 | goto out_finish; |
| 832 | } |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 833 | } |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 834 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 835 | error = snapshot_read_next(&snapshot); |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 836 | if (error < PAGE_SIZE) { |
| 837 | if (error >= 0) |
| 838 | error = -EFAULT; |
| 839 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 840 | goto out_finish; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 841 | } |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 842 | header = (struct swsusp_info *)data_of(snapshot); |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 843 | error = swap_write_page(&handle, header, NULL); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 844 | if (!error) { |
| 845 | error = (flags & SF_NOCOMPRESS_MODE) ? |
| 846 | save_image(&handle, &snapshot, pages - 1) : |
| 847 | save_image_lzo(&handle, &snapshot, pages - 1); |
| 848 | } |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 849 | out_finish: |
| 850 | error = swap_writer_finish(&handle, flags, error); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 851 | return error; |
| 852 | } |
| 853 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 854 | /** |
| 855 | * The following functions allow us to read data using a swap map |
| 856 | * in a file-alike way |
| 857 | */ |
| 858 | |
| 859 | static void release_swap_reader(struct swap_map_handle *handle) |
| 860 | { |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 861 | struct swap_map_page_list *tmp; |
| 862 | |
| 863 | while (handle->maps) { |
| 864 | if (handle->maps->map) |
| 865 | free_page((unsigned long)handle->maps->map); |
| 866 | tmp = handle->maps; |
| 867 | handle->maps = handle->maps->next; |
| 868 | kfree(tmp); |
| 869 | } |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 870 | handle->cur = NULL; |
| 871 | } |
| 872 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 873 | static int get_swap_reader(struct swap_map_handle *handle, |
| 874 | unsigned int *flags_p) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 875 | { |
| 876 | int error; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 877 | struct swap_map_page_list *tmp, *last; |
| 878 | sector_t offset; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 879 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 880 | *flags_p = swsusp_header->flags; |
| 881 | |
| 882 | if (!swsusp_header->image) /* how can this happen? */ |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 883 | return -EINVAL; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 884 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 885 | handle->cur = NULL; |
| 886 | last = handle->maps = NULL; |
| 887 | offset = swsusp_header->image; |
| 888 | while (offset) { |
| 889 | tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL); |
| 890 | if (!tmp) { |
| 891 | release_swap_reader(handle); |
| 892 | return -ENOMEM; |
| 893 | } |
| 894 | memset(tmp, 0, sizeof(*tmp)); |
| 895 | if (!handle->maps) |
| 896 | handle->maps = tmp; |
| 897 | if (last) |
| 898 | last->next = tmp; |
| 899 | last = tmp; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 900 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 901 | tmp->map = (struct swap_map_page *) |
| 902 | __get_free_page(__GFP_WAIT | __GFP_HIGH); |
| 903 | if (!tmp->map) { |
| 904 | release_swap_reader(handle); |
| 905 | return -ENOMEM; |
| 906 | } |
| 907 | |
| 908 | error = hib_bio_read_page(offset, tmp->map, NULL); |
| 909 | if (error) { |
| 910 | release_swap_reader(handle); |
| 911 | return error; |
| 912 | } |
| 913 | offset = tmp->map->next_swap; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 914 | } |
| 915 | handle->k = 0; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 916 | handle->cur = handle->maps->map; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 917 | return 0; |
| 918 | } |
| 919 | |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 920 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
| 921 | struct bio **bio_chain) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 922 | { |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 923 | sector_t offset; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 924 | int error; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 925 | struct swap_map_page_list *tmp; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 926 | |
| 927 | if (!handle->cur) |
| 928 | return -EINVAL; |
| 929 | offset = handle->cur->entries[handle->k]; |
| 930 | if (!offset) |
| 931 | return -EFAULT; |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 932 | error = hib_bio_read_page(offset, buf, bio_chain); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 933 | if (error) |
| 934 | return error; |
| 935 | if (++handle->k >= MAP_PAGE_ENTRIES) { |
| 936 | handle->k = 0; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 937 | free_page((unsigned long)handle->maps->map); |
| 938 | tmp = handle->maps; |
| 939 | handle->maps = handle->maps->next; |
| 940 | kfree(tmp); |
| 941 | if (!handle->maps) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 942 | release_swap_reader(handle); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 943 | else |
| 944 | handle->cur = handle->maps->map; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 945 | } |
| 946 | return error; |
| 947 | } |
| 948 | |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 949 | static int swap_reader_finish(struct swap_map_handle *handle) |
| 950 | { |
| 951 | release_swap_reader(handle); |
| 952 | |
| 953 | return 0; |
| 954 | } |
| 955 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 956 | /** |
| 957 | * load_image - load the image using the swap map handle |
| 958 | * @handle and the snapshot handle @snapshot |
| 959 | * (assume there are @nr_pages pages to load) |
| 960 | */ |
| 961 | |
| 962 | static int load_image(struct swap_map_handle *handle, |
| 963 | struct snapshot_handle *snapshot, |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 964 | unsigned int nr_to_read) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 965 | { |
| 966 | unsigned int m; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 967 | int ret = 0; |
Andrew Morton | 8c00249 | 2006-09-25 23:32:43 -0700 | [diff] [blame] | 968 | struct timeval start; |
| 969 | struct timeval stop; |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 970 | struct bio *bio; |
| 971 | int err2; |
| 972 | unsigned nr_pages; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 973 | |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 974 | printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n", |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 975 | nr_to_read); |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 976 | m = nr_to_read / 10; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 977 | if (!m) |
| 978 | m = 1; |
| 979 | nr_pages = 0; |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 980 | bio = NULL; |
Andrew Morton | 8c00249 | 2006-09-25 23:32:43 -0700 | [diff] [blame] | 981 | do_gettimeofday(&start); |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 982 | for ( ; ; ) { |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 983 | ret = snapshot_write_next(snapshot); |
| 984 | if (ret <= 0) |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 985 | break; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 986 | ret = swap_read_page(handle, data_of(*snapshot), &bio); |
| 987 | if (ret) |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 988 | break; |
| 989 | if (snapshot->sync_read) |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 990 | ret = hib_wait_on_bio_chain(&bio); |
| 991 | if (ret) |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 992 | break; |
| 993 | if (!(nr_pages % m)) |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 994 | printk(KERN_INFO "PM: Image loading progress: %3d%%\n", |
| 995 | nr_pages / m * 10); |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 996 | nr_pages++; |
| 997 | } |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 998 | err2 = hib_wait_on_bio_chain(&bio); |
Andrew Morton | 8c00249 | 2006-09-25 23:32:43 -0700 | [diff] [blame] | 999 | do_gettimeofday(&stop); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1000 | if (!ret) |
| 1001 | ret = err2; |
| 1002 | if (!ret) { |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1003 | printk(KERN_INFO "PM: Image loading done.\n"); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1004 | snapshot_write_finalize(snapshot); |
Con Kolivas | e655a25 | 2006-03-26 01:37:11 -0800 | [diff] [blame] | 1005 | if (!snapshot_image_loaded(snapshot)) |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1006 | ret = -ENODATA; |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1007 | } |
Rafael J. Wysocki | 0d3a9ab | 2006-12-06 20:34:32 -0800 | [diff] [blame] | 1008 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1009 | return ret; |
| 1010 | } |
| 1011 | |
| 1012 | /** |
| 1013 | * Structure used for LZO data decompression. |
| 1014 | */ |
| 1015 | struct dec_data { |
| 1016 | struct task_struct *thr; /* thread */ |
| 1017 | atomic_t ready; /* ready to start flag */ |
| 1018 | atomic_t stop; /* ready to stop flag */ |
| 1019 | int ret; /* return code */ |
| 1020 | wait_queue_head_t go; /* start decompression */ |
| 1021 | wait_queue_head_t done; /* decompression done */ |
| 1022 | size_t unc_len; /* uncompressed length */ |
| 1023 | size_t cmp_len; /* compressed length */ |
| 1024 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ |
| 1025 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ |
| 1026 | }; |
| 1027 | |
| 1028 | /** |
| 1029 | * Deompression function that runs in its own thread. |
| 1030 | */ |
| 1031 | static int lzo_decompress_threadfn(void *data) |
| 1032 | { |
| 1033 | struct dec_data *d = data; |
| 1034 | |
| 1035 | while (1) { |
| 1036 | wait_event(d->go, atomic_read(&d->ready) || |
| 1037 | kthread_should_stop()); |
| 1038 | if (kthread_should_stop()) { |
| 1039 | d->thr = NULL; |
| 1040 | d->ret = -1; |
| 1041 | atomic_set(&d->stop, 1); |
| 1042 | wake_up(&d->done); |
| 1043 | break; |
| 1044 | } |
| 1045 | atomic_set(&d->ready, 0); |
| 1046 | |
| 1047 | d->unc_len = LZO_UNC_SIZE; |
| 1048 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, |
| 1049 | d->unc, &d->unc_len); |
| 1050 | atomic_set(&d->stop, 1); |
| 1051 | wake_up(&d->done); |
| 1052 | } |
| 1053 | return 0; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1054 | } |
| 1055 | |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 1056 | /** |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1057 | * load_image_lzo - Load compressed image data and decompress them with LZO. |
| 1058 | * @handle: Swap map handle to use for loading data. |
| 1059 | * @snapshot: Image to copy uncompressed data into. |
| 1060 | * @nr_to_read: Number of pages to load. |
| 1061 | */ |
| 1062 | static int load_image_lzo(struct swap_map_handle *handle, |
| 1063 | struct snapshot_handle *snapshot, |
| 1064 | unsigned int nr_to_read) |
| 1065 | { |
| 1066 | unsigned int m; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1067 | int ret = 0; |
| 1068 | int eof = 0; |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1069 | struct bio *bio; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1070 | struct timeval start; |
| 1071 | struct timeval stop; |
| 1072 | unsigned nr_pages; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1073 | size_t off; |
| 1074 | unsigned i, thr, run_threads, nr_threads; |
| 1075 | unsigned ring = 0, pg = 0, ring_size = 0, |
| 1076 | have = 0, want, need, asked = 0; |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 1077 | unsigned long read_pages = 0; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1078 | unsigned char **page = NULL; |
| 1079 | struct dec_data *data = NULL; |
| 1080 | struct crc_data *crc = NULL; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1081 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1082 | /* |
| 1083 | * We'll limit the number of threads for decompression to limit memory |
| 1084 | * footprint. |
| 1085 | */ |
| 1086 | nr_threads = num_online_cpus() - 1; |
| 1087 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1088 | |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 1089 | page = vmalloc(sizeof(*page) * LZO_MAX_RD_PAGES); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1090 | if (!page) { |
| 1091 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); |
| 1092 | ret = -ENOMEM; |
| 1093 | goto out_clean; |
| 1094 | } |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1095 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1096 | data = vmalloc(sizeof(*data) * nr_threads); |
| 1097 | if (!data) { |
| 1098 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); |
| 1099 | ret = -ENOMEM; |
| 1100 | goto out_clean; |
| 1101 | } |
| 1102 | for (thr = 0; thr < nr_threads; thr++) |
| 1103 | memset(&data[thr], 0, offsetof(struct dec_data, go)); |
| 1104 | |
| 1105 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
| 1106 | if (!crc) { |
| 1107 | printk(KERN_ERR "PM: Failed to allocate crc\n"); |
| 1108 | ret = -ENOMEM; |
| 1109 | goto out_clean; |
| 1110 | } |
| 1111 | memset(crc, 0, offsetof(struct crc_data, go)); |
| 1112 | |
| 1113 | /* |
| 1114 | * Start the decompression threads. |
| 1115 | */ |
| 1116 | for (thr = 0; thr < nr_threads; thr++) { |
| 1117 | init_waitqueue_head(&data[thr].go); |
| 1118 | init_waitqueue_head(&data[thr].done); |
| 1119 | |
| 1120 | data[thr].thr = kthread_run(lzo_decompress_threadfn, |
| 1121 | &data[thr], |
| 1122 | "image_decompress/%u", thr); |
| 1123 | if (IS_ERR(data[thr].thr)) { |
| 1124 | data[thr].thr = NULL; |
| 1125 | printk(KERN_ERR |
| 1126 | "PM: Cannot start decompression threads\n"); |
| 1127 | ret = -ENOMEM; |
| 1128 | goto out_clean; |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1129 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1130 | } |
| 1131 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1132 | /* |
| 1133 | * Start the CRC32 thread. |
| 1134 | */ |
| 1135 | init_waitqueue_head(&crc->go); |
| 1136 | init_waitqueue_head(&crc->done); |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1137 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1138 | handle->crc32 = 0; |
| 1139 | crc->crc32 = &handle->crc32; |
| 1140 | for (thr = 0; thr < nr_threads; thr++) { |
| 1141 | crc->unc[thr] = data[thr].unc; |
| 1142 | crc->unc_len[thr] = &data[thr].unc_len; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1143 | } |
| 1144 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1145 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
| 1146 | if (IS_ERR(crc->thr)) { |
| 1147 | crc->thr = NULL; |
| 1148 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); |
| 1149 | ret = -ENOMEM; |
| 1150 | goto out_clean; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1151 | } |
| 1152 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1153 | /* |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 1154 | * Set the number of pages for read buffering. |
| 1155 | * This is complete guesswork, because we'll only know the real |
| 1156 | * picture once prepare_image() is called, which is much later on |
| 1157 | * during the image load phase. We'll assume the worst case and |
| 1158 | * say that none of the image pages are from high memory. |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1159 | */ |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 1160 | if (low_free_pages() > snapshot_get_image_size()) |
| 1161 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; |
| 1162 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1163 | |
| 1164 | for (i = 0; i < read_pages; i++) { |
| 1165 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? |
| 1166 | __GFP_WAIT | __GFP_HIGH : |
Bojan Smojver | 5a21d48 | 2012-04-29 22:42:06 +0200 | [diff] [blame] | 1167 | __GFP_WAIT | __GFP_NOWARN | |
| 1168 | __GFP_NORETRY); |
| 1169 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1170 | if (!page[i]) { |
| 1171 | if (i < LZO_CMP_PAGES) { |
| 1172 | ring_size = i; |
| 1173 | printk(KERN_ERR |
| 1174 | "PM: Failed to allocate LZO pages\n"); |
| 1175 | ret = -ENOMEM; |
| 1176 | goto out_clean; |
| 1177 | } else { |
| 1178 | break; |
| 1179 | } |
| 1180 | } |
| 1181 | } |
| 1182 | want = ring_size = i; |
| 1183 | |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1184 | printk(KERN_INFO |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1185 | "PM: Using %u thread(s) for decompression.\n" |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1186 | "PM: Loading and decompressing image data (%u pages)...\n", |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1187 | nr_threads, nr_to_read); |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1188 | m = nr_to_read / 10; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1189 | if (!m) |
| 1190 | m = 1; |
| 1191 | nr_pages = 0; |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1192 | bio = NULL; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1193 | do_gettimeofday(&start); |
| 1194 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1195 | ret = snapshot_write_next(snapshot); |
| 1196 | if (ret <= 0) |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1197 | goto out_finish; |
| 1198 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1199 | for(;;) { |
| 1200 | for (i = 0; !eof && i < want; i++) { |
| 1201 | ret = swap_read_page(handle, page[ring], &bio); |
| 1202 | if (ret) { |
| 1203 | /* |
| 1204 | * On real read error, finish. On end of data, |
| 1205 | * set EOF flag and just exit the read loop. |
| 1206 | */ |
| 1207 | if (handle->cur && |
| 1208 | handle->cur->entries[handle->k]) { |
| 1209 | goto out_finish; |
| 1210 | } else { |
| 1211 | eof = 1; |
| 1212 | break; |
| 1213 | } |
| 1214 | } |
| 1215 | if (++ring >= ring_size) |
| 1216 | ring = 0; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1217 | } |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1218 | asked += i; |
| 1219 | want -= i; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1220 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1221 | /* |
| 1222 | * We are out of data, wait for some more. |
| 1223 | */ |
| 1224 | if (!have) { |
| 1225 | if (!asked) |
| 1226 | break; |
| 1227 | |
| 1228 | ret = hib_wait_on_bio_chain(&bio); |
| 1229 | if (ret) |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1230 | goto out_finish; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1231 | have += asked; |
| 1232 | asked = 0; |
| 1233 | if (eof) |
| 1234 | eof = 2; |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1235 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1236 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1237 | if (crc->run_threads) { |
| 1238 | wait_event(crc->done, atomic_read(&crc->stop)); |
| 1239 | atomic_set(&crc->stop, 0); |
| 1240 | crc->run_threads = 0; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1241 | } |
| 1242 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1243 | for (thr = 0; have && thr < nr_threads; thr++) { |
| 1244 | data[thr].cmp_len = *(size_t *)page[pg]; |
| 1245 | if (unlikely(!data[thr].cmp_len || |
| 1246 | data[thr].cmp_len > |
| 1247 | lzo1x_worst_compress(LZO_UNC_SIZE))) { |
| 1248 | printk(KERN_ERR |
| 1249 | "PM: Invalid LZO compressed length\n"); |
| 1250 | ret = -1; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1251 | goto out_finish; |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, |
| 1255 | PAGE_SIZE); |
| 1256 | if (need > have) { |
| 1257 | if (eof > 1) { |
| 1258 | ret = -1; |
| 1259 | goto out_finish; |
| 1260 | } |
| 1261 | break; |
| 1262 | } |
| 1263 | |
| 1264 | for (off = 0; |
| 1265 | off < LZO_HEADER + data[thr].cmp_len; |
| 1266 | off += PAGE_SIZE) { |
| 1267 | memcpy(data[thr].cmp + off, |
| 1268 | page[pg], PAGE_SIZE); |
| 1269 | have--; |
| 1270 | want++; |
| 1271 | if (++pg >= ring_size) |
| 1272 | pg = 0; |
| 1273 | } |
| 1274 | |
| 1275 | atomic_set(&data[thr].ready, 1); |
| 1276 | wake_up(&data[thr].go); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1277 | } |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1278 | |
| 1279 | /* |
| 1280 | * Wait for more data while we are decompressing. |
| 1281 | */ |
| 1282 | if (have < LZO_CMP_PAGES && asked) { |
| 1283 | ret = hib_wait_on_bio_chain(&bio); |
| 1284 | if (ret) |
| 1285 | goto out_finish; |
| 1286 | have += asked; |
| 1287 | asked = 0; |
| 1288 | if (eof) |
| 1289 | eof = 2; |
| 1290 | } |
| 1291 | |
| 1292 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
| 1293 | wait_event(data[thr].done, |
| 1294 | atomic_read(&data[thr].stop)); |
| 1295 | atomic_set(&data[thr].stop, 0); |
| 1296 | |
| 1297 | ret = data[thr].ret; |
| 1298 | |
| 1299 | if (ret < 0) { |
| 1300 | printk(KERN_ERR |
| 1301 | "PM: LZO decompression failed\n"); |
| 1302 | goto out_finish; |
| 1303 | } |
| 1304 | |
| 1305 | if (unlikely(!data[thr].unc_len || |
| 1306 | data[thr].unc_len > LZO_UNC_SIZE || |
| 1307 | data[thr].unc_len & (PAGE_SIZE - 1))) { |
| 1308 | printk(KERN_ERR |
| 1309 | "PM: Invalid LZO uncompressed length\n"); |
| 1310 | ret = -1; |
| 1311 | goto out_finish; |
| 1312 | } |
| 1313 | |
| 1314 | for (off = 0; |
| 1315 | off < data[thr].unc_len; off += PAGE_SIZE) { |
| 1316 | memcpy(data_of(*snapshot), |
| 1317 | data[thr].unc + off, PAGE_SIZE); |
| 1318 | |
| 1319 | if (!(nr_pages % m)) |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1320 | printk(KERN_INFO |
| 1321 | "PM: Image loading progress: " |
| 1322 | "%3d%%\n", |
| 1323 | nr_pages / m * 10); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1324 | nr_pages++; |
| 1325 | |
| 1326 | ret = snapshot_write_next(snapshot); |
| 1327 | if (ret <= 0) { |
| 1328 | crc->run_threads = thr + 1; |
| 1329 | atomic_set(&crc->ready, 1); |
| 1330 | wake_up(&crc->go); |
| 1331 | goto out_finish; |
| 1332 | } |
| 1333 | } |
| 1334 | } |
| 1335 | |
| 1336 | crc->run_threads = thr; |
| 1337 | atomic_set(&crc->ready, 1); |
| 1338 | wake_up(&crc->go); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1339 | } |
| 1340 | |
| 1341 | out_finish: |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1342 | if (crc->run_threads) { |
| 1343 | wait_event(crc->done, atomic_read(&crc->stop)); |
| 1344 | atomic_set(&crc->stop, 0); |
| 1345 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1346 | do_gettimeofday(&stop); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1347 | if (!ret) { |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1348 | printk(KERN_INFO "PM: Image loading done.\n"); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1349 | snapshot_write_finalize(snapshot); |
| 1350 | if (!snapshot_image_loaded(snapshot)) |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1351 | ret = -ENODATA; |
| 1352 | if (!ret) { |
| 1353 | if (swsusp_header->flags & SF_CRC32_MODE) { |
| 1354 | if(handle->crc32 != swsusp_header->crc32) { |
| 1355 | printk(KERN_ERR |
| 1356 | "PM: Invalid image CRC32!\n"); |
| 1357 | ret = -ENODATA; |
| 1358 | } |
| 1359 | } |
| 1360 | } |
Bojan Smojver | d8150d3 | 2012-06-21 22:27:24 +0200 | [diff] [blame] | 1361 | } |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1362 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1363 | out_clean: |
| 1364 | for (i = 0; i < ring_size; i++) |
Bojan Smojver | 9f339ca | 2010-11-25 23:41:39 +0100 | [diff] [blame] | 1365 | free_page((unsigned long)page[i]); |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1366 | if (crc) { |
| 1367 | if (crc->thr) |
| 1368 | kthread_stop(crc->thr); |
| 1369 | kfree(crc); |
| 1370 | } |
| 1371 | if (data) { |
| 1372 | for (thr = 0; thr < nr_threads; thr++) |
| 1373 | if (data[thr].thr) |
| 1374 | kthread_stop(data[thr].thr); |
| 1375 | vfree(data); |
| 1376 | } |
| 1377 | if (page) vfree(page); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1378 | |
Bojan Smojver | 081a9d0 | 2011-10-13 23:58:07 +0200 | [diff] [blame] | 1379 | return ret; |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1380 | } |
| 1381 | |
| 1382 | /** |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 1383 | * swsusp_read - read the hibernation image. |
| 1384 | * @flags_p: flags passed by the "frozen" kernel in the image header should |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 1385 | * be written into this memory location |
Rafael J. Wysocki | a634cc1 | 2007-07-19 01:47:30 -0700 | [diff] [blame] | 1386 | */ |
| 1387 | |
| 1388 | int swsusp_read(unsigned int *flags_p) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1389 | { |
| 1390 | int error; |
| 1391 | struct swap_map_handle handle; |
| 1392 | struct snapshot_handle snapshot; |
| 1393 | struct swsusp_info *header; |
| 1394 | |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1395 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 1396 | error = snapshot_write_next(&snapshot); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1397 | if (error < PAGE_SIZE) |
| 1398 | return error < 0 ? error : -EFAULT; |
| 1399 | header = (struct swsusp_info *)data_of(snapshot); |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 1400 | error = get_swap_reader(&handle, flags_p); |
| 1401 | if (error) |
| 1402 | goto end; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1403 | if (!error) |
Andrew Morton | 546e0d2 | 2006-09-25 23:32:44 -0700 | [diff] [blame] | 1404 | error = swap_read_page(&handle, header, NULL); |
Bojan Smojver | f996fc9 | 2010-09-09 23:06:23 +0200 | [diff] [blame] | 1405 | if (!error) { |
| 1406 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? |
| 1407 | load_image(&handle, &snapshot, header->pages - 1) : |
| 1408 | load_image_lzo(&handle, &snapshot, header->pages - 1); |
| 1409 | } |
Jiri Slaby | 6f612af | 2010-05-01 23:54:02 +0200 | [diff] [blame] | 1410 | swap_reader_finish(&handle); |
| 1411 | end: |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1412 | if (!error) |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1413 | pr_debug("PM: Image successfully loaded\n"); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1414 | else |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1415 | pr_debug("PM: Error %d resuming\n", error); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1416 | return error; |
| 1417 | } |
| 1418 | |
| 1419 | /** |
| 1420 | * swsusp_check - Check for swsusp signature in the resume device |
| 1421 | */ |
| 1422 | |
| 1423 | int swsusp_check(void) |
| 1424 | { |
| 1425 | int error; |
| 1426 | |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 1427 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
| 1428 | FMODE_READ, NULL); |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1429 | if (!IS_ERR(hib_resume_bdev)) { |
| 1430 | set_blocksize(hib_resume_bdev, PAGE_SIZE); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 1431 | clear_page(swsusp_header); |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1432 | error = hib_bio_read_page(swsusp_resume_block, |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 1433 | swsusp_header, NULL); |
Rafael J. Wysocki | 9a154d9 | 2006-12-06 20:34:12 -0800 | [diff] [blame] | 1434 | if (error) |
Jiri Slaby | 76b57e6 | 2009-10-07 22:37:35 +0200 | [diff] [blame] | 1435 | goto put; |
Rafael J. Wysocki | 9a154d9 | 2006-12-06 20:34:12 -0800 | [diff] [blame] | 1436 | |
Rafael J. Wysocki | 3624eb0 | 2010-10-04 22:08:12 +0200 | [diff] [blame] | 1437 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 1438 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1439 | /* Reset swap signature now */ |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1440 | error = hib_bio_write_page(swsusp_resume_block, |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 1441 | swsusp_header, NULL); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1442 | } else { |
Jiri Slaby | 76b57e6 | 2009-10-07 22:37:35 +0200 | [diff] [blame] | 1443 | error = -EINVAL; |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1444 | } |
Jiri Slaby | 76b57e6 | 2009-10-07 22:37:35 +0200 | [diff] [blame] | 1445 | |
| 1446 | put: |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1447 | if (error) |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1448 | blkdev_put(hib_resume_bdev, FMODE_READ); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1449 | else |
Rafael J. Wysocki | d0941ea | 2010-09-28 23:31:22 +0200 | [diff] [blame] | 1450 | pr_debug("PM: Image signature found, resuming\n"); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1451 | } else { |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1452 | error = PTR_ERR(hib_resume_bdev); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1453 | } |
| 1454 | |
| 1455 | if (error) |
Rafael J. Wysocki | d0941ea | 2010-09-28 23:31:22 +0200 | [diff] [blame] | 1456 | pr_debug("PM: Image not found (code %d)\n", error); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1457 | |
| 1458 | return error; |
| 1459 | } |
| 1460 | |
| 1461 | /** |
| 1462 | * swsusp_close - close swap device. |
| 1463 | */ |
| 1464 | |
Al Viro | c2dd0da | 2007-10-08 13:21:10 -0400 | [diff] [blame] | 1465 | void swsusp_close(fmode_t mode) |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1466 | { |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1467 | if (IS_ERR(hib_resume_bdev)) { |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1468 | pr_debug("PM: Image device not initialised\n"); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1469 | return; |
| 1470 | } |
| 1471 | |
Jiri Slaby | 8a0d613 | 2010-05-01 23:52:34 +0200 | [diff] [blame] | 1472 | blkdev_put(hib_resume_bdev, mode); |
Rafael J. Wysocki | 61159a3 | 2006-03-23 03:00:00 -0800 | [diff] [blame] | 1473 | } |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 1474 | |
Bojan Smojver | 62c552c | 2012-06-16 00:09:58 +0200 | [diff] [blame] | 1475 | /** |
| 1476 | * swsusp_unmark - Unmark swsusp signature in the resume device |
| 1477 | */ |
| 1478 | |
| 1479 | #ifdef CONFIG_SUSPEND |
| 1480 | int swsusp_unmark(void) |
| 1481 | { |
| 1482 | int error; |
| 1483 | |
| 1484 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
| 1485 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
| 1486 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); |
| 1487 | error = hib_bio_write_page(swsusp_resume_block, |
| 1488 | swsusp_header, NULL); |
| 1489 | } else { |
| 1490 | printk(KERN_ERR "PM: Cannot find swsusp signature!\n"); |
| 1491 | error = -ENODEV; |
| 1492 | } |
| 1493 | |
| 1494 | /* |
| 1495 | * We just returned from suspend, we don't need the image any more. |
| 1496 | */ |
| 1497 | free_all_swap_pages(root_swap); |
| 1498 | |
| 1499 | return error; |
| 1500 | } |
| 1501 | #endif |
| 1502 | |
Vivek Goyal | 1b29c16 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 1503 | static int swsusp_header_init(void) |
| 1504 | { |
| 1505 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); |
| 1506 | if (!swsusp_header) |
| 1507 | panic("Could not allocate memory for swsusp_header\n"); |
| 1508 | return 0; |
| 1509 | } |
| 1510 | |
| 1511 | core_initcall(swsusp_header_init); |