Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * c 2001 PPC 64 Team, IBM Corp |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * /dev/nvram driver for PPC64 |
| 10 | * |
| 11 | * This perhaps should live in drivers/char |
| 12 | * |
| 13 | * TODO: Split the /dev/nvram part (that one can use |
| 14 | * drivers/char/generic_nvram.c) from the arch & partition |
| 15 | * parsing code. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/miscdevice.h> |
| 24 | #include <linux/fcntl.h> |
| 25 | #include <linux/nvram.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/spinlock.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/nvram.h> |
| 31 | #include <asm/rtas.h> |
| 32 | #include <asm/prom.h> |
| 33 | #include <asm/machdep.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #undef DEBUG_NVRAM |
| 36 | |
Benjamin Herrenschmidt | 3667330 | 2010-07-29 18:18:44 +1000 | [diff] [blame] | 37 | #define NVRAM_HEADER_LEN sizeof(struct nvram_header) |
| 38 | #define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN |
Benjamin Herrenschmidt | 74d51d0 | 2010-07-29 14:45:24 +1000 | [diff] [blame] | 39 | |
| 40 | /* If change this size, then change the size of NVNAME_LEN */ |
| 41 | struct nvram_header { |
| 42 | unsigned char signature; |
| 43 | unsigned char checksum; |
| 44 | unsigned short length; |
Jim Keniston | 6024ede | 2010-11-11 18:54:27 +0000 | [diff] [blame] | 45 | /* Terminating null required only for names < 12 chars. */ |
Benjamin Herrenschmidt | 74d51d0 | 2010-07-29 14:45:24 +1000 | [diff] [blame] | 46 | char name[12]; |
| 47 | }; |
| 48 | |
| 49 | struct nvram_partition { |
| 50 | struct list_head partition; |
| 51 | struct nvram_header header; |
| 52 | unsigned int index; |
| 53 | }; |
| 54 | |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 55 | static LIST_HEAD(nvram_partitions); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) |
| 58 | { |
| 59 | int size; |
| 60 | |
| 61 | if (ppc_md.nvram_size == NULL) |
| 62 | return -ENODEV; |
| 63 | size = ppc_md.nvram_size(); |
| 64 | |
| 65 | switch (origin) { |
| 66 | case 1: |
| 67 | offset += file->f_pos; |
| 68 | break; |
| 69 | case 2: |
| 70 | offset += size; |
| 71 | break; |
| 72 | } |
| 73 | if (offset < 0) |
| 74 | return -EINVAL; |
| 75 | file->f_pos = offset; |
| 76 | return file->f_pos; |
| 77 | } |
| 78 | |
| 79 | |
| 80 | static ssize_t dev_nvram_read(struct file *file, char __user *buf, |
| 81 | size_t count, loff_t *ppos) |
| 82 | { |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 83 | ssize_t ret; |
| 84 | char *tmp = NULL; |
| 85 | ssize_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 87 | ret = -ENODEV; |
| 88 | if (!ppc_md.nvram_size) |
| 89 | goto out; |
| 90 | |
| 91 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | size = ppc_md.nvram_size(); |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 93 | if (*ppos >= size || size < 0) |
| 94 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 96 | count = min_t(size_t, count, size - *ppos); |
| 97 | count = min(count, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 99 | ret = -ENOMEM; |
| 100 | tmp = kmalloc(count, GFP_KERNEL); |
| 101 | if (!tmp) |
| 102 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 104 | ret = ppc_md.nvram_read(tmp, count, ppos); |
| 105 | if (ret <= 0) |
| 106 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 108 | if (copy_to_user(buf, tmp, ret)) |
| 109 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 111 | out: |
| 112 | kfree(tmp); |
| 113 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | } |
| 116 | |
| 117 | static ssize_t dev_nvram_write(struct file *file, const char __user *buf, |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 118 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 120 | ssize_t ret; |
| 121 | char *tmp = NULL; |
| 122 | ssize_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 124 | ret = -ENODEV; |
| 125 | if (!ppc_md.nvram_size) |
| 126 | goto out; |
| 127 | |
| 128 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | size = ppc_md.nvram_size(); |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 130 | if (*ppos >= size || size < 0) |
| 131 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 133 | count = min_t(size_t, count, size - *ppos); |
| 134 | count = min(count, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 136 | ret = -ENOMEM; |
| 137 | tmp = kmalloc(count, GFP_KERNEL); |
| 138 | if (!tmp) |
| 139 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 141 | ret = -EFAULT; |
| 142 | if (copy_from_user(tmp, buf, count)) |
| 143 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Arnd Bergmann | f9ce299 | 2005-12-09 19:21:44 +0100 | [diff] [blame] | 145 | ret = ppc_md.nvram_write(tmp, count, ppos); |
| 146 | |
| 147 | out: |
| 148 | kfree(tmp); |
| 149 | return ret; |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Thomas Gleixner | 3b03fec | 2009-10-14 22:42:28 +0000 | [diff] [blame] | 153 | static long dev_nvram_ioctl(struct file *file, unsigned int cmd, |
| 154 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | switch(cmd) { |
| 157 | #ifdef CONFIG_PPC_PMAC |
| 158 | case OBSOLETE_PMAC_NVRAM_GET_OFFSET: |
| 159 | printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); |
| 160 | case IOC_NVRAM_GET_OFFSET: { |
| 161 | int part, offset; |
| 162 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 163 | if (!machine_is(powermac)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | return -EINVAL; |
| 165 | if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) |
| 166 | return -EFAULT; |
| 167 | if (part < pmac_nvram_OF || part > pmac_nvram_NR) |
| 168 | return -EINVAL; |
| 169 | offset = pmac_get_partition(part); |
| 170 | if (offset < 0) |
| 171 | return offset; |
| 172 | if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) |
| 173 | return -EFAULT; |
| 174 | return 0; |
| 175 | } |
| 176 | #endif /* CONFIG_PPC_PMAC */ |
Stephen Rothwell | af30837 | 2006-03-23 17:38:10 +1100 | [diff] [blame] | 177 | default: |
| 178 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 182 | const struct file_operations nvram_fops = { |
Thomas Gleixner | 3b03fec | 2009-10-14 22:42:28 +0000 | [diff] [blame] | 183 | .owner = THIS_MODULE, |
| 184 | .llseek = dev_nvram_llseek, |
| 185 | .read = dev_nvram_read, |
| 186 | .write = dev_nvram_write, |
| 187 | .unlocked_ioctl = dev_nvram_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | }; |
| 189 | |
| 190 | static struct miscdevice nvram_dev = { |
| 191 | NVRAM_MINOR, |
| 192 | "nvram", |
| 193 | &nvram_fops |
| 194 | }; |
| 195 | |
| 196 | |
| 197 | #ifdef DEBUG_NVRAM |
Thomas Gleixner | 32c105c | 2009-10-14 22:54:46 +0000 | [diff] [blame] | 198 | static void __init nvram_print_partitions(char * label) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct nvram_partition * tmp_part; |
| 201 | |
| 202 | printk(KERN_WARNING "--------%s---------\n", label); |
| 203 | printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 204 | list_for_each_entry(tmp_part, &nvram_partitions, partition) { |
Jim Keniston | 6024ede | 2010-11-11 18:54:27 +0000 | [diff] [blame] | 205 | printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | tmp_part->index, tmp_part->header.signature, |
| 207 | tmp_part->header.checksum, tmp_part->header.length, |
| 208 | tmp_part->header.name); |
| 209 | } |
| 210 | } |
| 211 | #endif |
| 212 | |
| 213 | |
Thomas Gleixner | 32c105c | 2009-10-14 22:54:46 +0000 | [diff] [blame] | 214 | static int __init nvram_write_header(struct nvram_partition * part) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
| 216 | loff_t tmp_index; |
| 217 | int rc; |
| 218 | |
| 219 | tmp_index = part->index; |
| 220 | rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); |
| 221 | |
| 222 | return rc; |
| 223 | } |
| 224 | |
| 225 | |
Thomas Gleixner | 32c105c | 2009-10-14 22:54:46 +0000 | [diff] [blame] | 226 | static unsigned char __init nvram_checksum(struct nvram_header *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
| 228 | unsigned int c_sum, c_sum2; |
| 229 | unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ |
| 230 | c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; |
| 231 | |
| 232 | /* The sum may have spilled into the 3rd byte. Fold it back. */ |
| 233 | c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; |
| 234 | /* The sum cannot exceed 2 bytes. Fold it into a checksum */ |
| 235 | c_sum2 = (c_sum >> 8) + (c_sum << 8); |
| 236 | c_sum = ((c_sum + c_sum2) >> 8) & 0xff; |
| 237 | return c_sum; |
| 238 | } |
| 239 | |
Jim Keniston | 0f4ac13 | 2011-02-09 12:43:13 +0000 | [diff] [blame] | 240 | /* |
| 241 | * Per the criteria passed via nvram_remove_partition(), should this |
| 242 | * partition be removed? 1=remove, 0=keep |
| 243 | */ |
| 244 | static int nvram_can_remove_partition(struct nvram_partition *part, |
| 245 | const char *name, int sig, const char *exceptions[]) |
| 246 | { |
| 247 | if (part->header.signature != sig) |
| 248 | return 0; |
| 249 | if (name) { |
| 250 | if (strncmp(name, part->header.name, 12)) |
| 251 | return 0; |
| 252 | } else if (exceptions) { |
| 253 | const char **except; |
| 254 | for (except = exceptions; *except; except++) { |
| 255 | if (!strncmp(*except, part->header.name, 12)) |
| 256 | return 0; |
| 257 | } |
| 258 | } |
| 259 | return 1; |
| 260 | } |
| 261 | |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 262 | /** |
| 263 | * nvram_remove_partition - Remove one or more partitions in nvram |
| 264 | * @name: name of the partition to remove, or NULL for a |
| 265 | * signature only match |
| 266 | * @sig: signature of the partition(s) to remove |
Jim Keniston | 0f4ac13 | 2011-02-09 12:43:13 +0000 | [diff] [blame] | 267 | * @exceptions: When removing all partitions with a matching signature, |
| 268 | * leave these alone. |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 269 | */ |
| 270 | |
Jim Keniston | 0f4ac13 | 2011-02-09 12:43:13 +0000 | [diff] [blame] | 271 | int __init nvram_remove_partition(const char *name, int sig, |
| 272 | const char *exceptions[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | { |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 274 | struct nvram_partition *part, *prev, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | int rc; |
| 276 | |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 277 | list_for_each_entry(part, &nvram_partitions, partition) { |
Jim Keniston | 0f4ac13 | 2011-02-09 12:43:13 +0000 | [diff] [blame] | 278 | if (!nvram_can_remove_partition(part, name, sig, exceptions)) |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 279 | continue; |
| 280 | |
| 281 | /* Make partition a free partition */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | part->header.signature = NVRAM_SIG_FREE; |
Jim Keniston | 6024ede | 2010-11-11 18:54:27 +0000 | [diff] [blame] | 283 | strncpy(part->header.name, "wwwwwwwwwwww", 12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | part->header.checksum = nvram_checksum(&part->header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | rc = nvram_write_header(part); |
| 286 | if (rc <= 0) { |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 287 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | return rc; |
| 289 | } |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 290 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 292 | /* Merge contiguous ones */ |
| 293 | prev = NULL; |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 294 | list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { |
Benjamin Herrenschmidt | fa2b4e5 | 2010-07-29 18:19:59 +1000 | [diff] [blame] | 295 | if (part->header.signature != NVRAM_SIG_FREE) { |
| 296 | prev = NULL; |
| 297 | continue; |
| 298 | } |
| 299 | if (prev) { |
| 300 | prev->header.length += part->header.length; |
| 301 | prev->header.checksum = nvram_checksum(&part->header); |
| 302 | rc = nvram_write_header(part); |
| 303 | if (rc <= 0) { |
| 304 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
| 305 | return rc; |
| 306 | } |
| 307 | list_del(&part->partition); |
| 308 | kfree(part); |
| 309 | } else |
| 310 | prev = part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 316 | /** |
| 317 | * nvram_create_partition - Create a partition in nvram |
| 318 | * @name: name of the partition to create |
| 319 | * @sig: signature of the partition to create |
Benjamin Herrenschmidt | 3667330 | 2010-07-29 18:18:44 +1000 | [diff] [blame] | 320 | * @req_size: size of data to allocate in bytes |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 321 | * @min_size: minimum acceptable size (0 means req_size) |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 322 | * |
| 323 | * Returns a negative error code or a positive nvram index |
| 324 | * of the beginning of the data area of the newly created |
| 325 | * partition. If you provided a min_size smaller than req_size |
| 326 | * you need to query for the actual size yourself after the |
| 327 | * call using nvram_partition_get_size(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | */ |
Benjamin Herrenschmidt | edc79a2 | 2010-08-02 11:18:09 +1000 | [diff] [blame] | 329 | loff_t __init nvram_create_partition(const char *name, int sig, |
| 330 | int req_size, int min_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
Arnd Bergmann | a341ad9 | 2005-06-28 20:33:49 +1000 | [diff] [blame] | 332 | struct nvram_partition *part; |
| 333 | struct nvram_partition *new_part; |
akpm@osdl.org | 0339ad7 | 2005-05-01 08:58:44 -0700 | [diff] [blame] | 334 | struct nvram_partition *free_part = NULL; |
Benjamin Herrenschmidt | cef0d5a | 2010-07-29 17:22:34 +1000 | [diff] [blame] | 335 | static char nv_init_vals[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | loff_t tmp_index; |
| 337 | long size = 0; |
| 338 | int rc; |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 339 | |
Benjamin Herrenschmidt | 3667330 | 2010-07-29 18:18:44 +1000 | [diff] [blame] | 340 | /* Convert sizes from bytes to blocks */ |
| 341 | req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; |
| 342 | min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; |
| 343 | |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 344 | /* If no minimum size specified, make it the same as the |
| 345 | * requested size |
| 346 | */ |
| 347 | if (min_size == 0) |
| 348 | min_size = req_size; |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 349 | if (min_size > req_size) |
| 350 | return -EINVAL; |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 351 | |
Benjamin Herrenschmidt | 3667330 | 2010-07-29 18:18:44 +1000 | [diff] [blame] | 352 | /* Now add one block to each for the header */ |
| 353 | req_size += 1; |
| 354 | min_size += 1; |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | /* Find a free partition that will give us the maximum needed size |
| 357 | If can't find one that will give us the minimum size needed */ |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 358 | list_for_each_entry(part, &nvram_partitions, partition) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (part->header.signature != NVRAM_SIG_FREE) |
| 360 | continue; |
| 361 | |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 362 | if (part->header.length >= req_size) { |
| 363 | size = req_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | free_part = part; |
| 365 | break; |
| 366 | } |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 367 | if (part->header.length > size && |
| 368 | part->header.length >= min_size) { |
| 369 | size = part->header.length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | free_part = part; |
| 371 | } |
| 372 | } |
akpm@osdl.org | 0339ad7 | 2005-05-01 08:58:44 -0700 | [diff] [blame] | 373 | if (!size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | return -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | /* Create our OS partition */ |
akpm@osdl.org | 0339ad7 | 2005-05-01 08:58:44 -0700 | [diff] [blame] | 377 | new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | if (!new_part) { |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 379 | pr_err("nvram_create_os_partition: kmalloc failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | return -ENOMEM; |
| 381 | } |
| 382 | |
| 383 | new_part->index = free_part->index; |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 384 | new_part->header.signature = sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | new_part->header.length = size; |
Benjamin Herrenschmidt | 4e7c77a | 2010-07-29 15:28:20 +1000 | [diff] [blame] | 386 | strncpy(new_part->header.name, name, 12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | new_part->header.checksum = nvram_checksum(&new_part->header); |
| 388 | |
| 389 | rc = nvram_write_header(new_part); |
| 390 | if (rc <= 0) { |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 391 | pr_err("nvram_create_os_partition: nvram_write_header " |
| 392 | "failed (%d)\n", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return rc; |
| 394 | } |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 395 | list_add_tail(&new_part->partition, &free_part->partition); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 397 | /* Adjust or remove the partition we stole the space from */ |
| 398 | if (free_part->header.length > size) { |
| 399 | free_part->index += size * NVRAM_BLOCK_LEN; |
| 400 | free_part->header.length -= size; |
| 401 | free_part->header.checksum = nvram_checksum(&free_part->header); |
| 402 | rc = nvram_write_header(free_part); |
| 403 | if (rc <= 0) { |
| 404 | pr_err("nvram_create_os_partition: nvram_write_header " |
| 405 | "failed (%d)\n", rc); |
| 406 | return rc; |
| 407 | } |
| 408 | } else { |
| 409 | list_del(&free_part->partition); |
| 410 | kfree(free_part); |
| 411 | } |
| 412 | |
| 413 | /* Clear the new partition */ |
Benjamin Herrenschmidt | cef0d5a | 2010-07-29 17:22:34 +1000 | [diff] [blame] | 414 | for (tmp_index = new_part->index + NVRAM_HEADER_LEN; |
| 415 | tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); |
| 416 | tmp_index += NVRAM_BLOCK_LEN) { |
| 417 | rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); |
| 418 | if (rc <= 0) { |
| 419 | pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc); |
| 420 | return rc; |
| 421 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } |
| 423 | |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 424 | return new_part->index + NVRAM_HEADER_LEN; |
| 425 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 427 | /** |
| 428 | * nvram_get_partition_size - Get the data size of an nvram partition |
| 429 | * @data_index: This is the offset of the start of the data of |
| 430 | * the partition. The same value that is returned by |
| 431 | * nvram_create_partition(). |
| 432 | */ |
Benjamin Herrenschmidt | edc79a2 | 2010-08-02 11:18:09 +1000 | [diff] [blame] | 433 | int nvram_get_partition_size(loff_t data_index) |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 434 | { |
| 435 | struct nvram_partition *part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 437 | list_for_each_entry(part, &nvram_partitions, partition) { |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 438 | if (part->index + NVRAM_HEADER_LEN == data_index) |
| 439 | return (part->header.length - 1) * NVRAM_BLOCK_LEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
Benjamin Herrenschmidt | e49e2e8 | 2010-07-29 17:38:55 +1000 | [diff] [blame] | 441 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | |
Benjamin Herrenschmidt | cf5cbf9 | 2010-08-02 10:01:58 +1000 | [diff] [blame] | 445 | /** |
| 446 | * nvram_find_partition - Find an nvram partition by signature and name |
| 447 | * @name: Name of the partition or NULL for any name |
| 448 | * @sig: Signature to test against |
| 449 | * @out_size: if non-NULL, returns the size of the data part of the partition |
| 450 | */ |
| 451 | loff_t nvram_find_partition(const char *name, int sig, int *out_size) |
| 452 | { |
| 453 | struct nvram_partition *p; |
| 454 | |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 455 | list_for_each_entry(p, &nvram_partitions, partition) { |
Benjamin Herrenschmidt | cf5cbf9 | 2010-08-02 10:01:58 +1000 | [diff] [blame] | 456 | if (p->header.signature == sig && |
| 457 | (!name || !strncmp(p->header.name, name, 12))) { |
| 458 | if (out_size) |
| 459 | *out_size = (p->header.length - 1) * |
| 460 | NVRAM_BLOCK_LEN; |
| 461 | return p->index + NVRAM_HEADER_LEN; |
| 462 | } |
| 463 | } |
| 464 | return 0; |
| 465 | } |
| 466 | |
Benjamin Herrenschmidt | edc79a2 | 2010-08-02 11:18:09 +1000 | [diff] [blame] | 467 | int __init nvram_scan_partitions(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | { |
| 469 | loff_t cur_index = 0; |
| 470 | struct nvram_header phead; |
| 471 | struct nvram_partition * tmp_part; |
| 472 | unsigned char c_sum; |
| 473 | char * header; |
| 474 | int total_size; |
| 475 | int err; |
| 476 | |
Benjamin Herrenschmidt | edc79a2 | 2010-08-02 11:18:09 +1000 | [diff] [blame] | 477 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | return -ENODEV; |
| 479 | total_size = ppc_md.nvram_size(); |
| 480 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 481 | header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | if (!header) { |
| 483 | printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); |
| 484 | return -ENOMEM; |
| 485 | } |
| 486 | |
| 487 | while (cur_index < total_size) { |
| 488 | |
| 489 | err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); |
| 490 | if (err != NVRAM_HEADER_LEN) { |
| 491 | printk(KERN_ERR "nvram_scan_partitions: Error parsing " |
| 492 | "nvram partitions\n"); |
| 493 | goto out; |
| 494 | } |
| 495 | |
| 496 | cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ |
| 497 | |
| 498 | memcpy(&phead, header, NVRAM_HEADER_LEN); |
| 499 | |
| 500 | err = 0; |
| 501 | c_sum = nvram_checksum(&phead); |
| 502 | if (c_sum != phead.checksum) { |
| 503 | printk(KERN_WARNING "WARNING: nvram partition checksum" |
| 504 | " was %02x, should be %02x!\n", |
| 505 | phead.checksum, c_sum); |
| 506 | printk(KERN_WARNING "Terminating nvram partition scan\n"); |
| 507 | goto out; |
| 508 | } |
| 509 | if (!phead.length) { |
| 510 | printk(KERN_WARNING "WARNING: nvram corruption " |
| 511 | "detected: 0-length partition\n"); |
| 512 | goto out; |
| 513 | } |
| 514 | tmp_part = (struct nvram_partition *) |
| 515 | kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); |
| 516 | err = -ENOMEM; |
| 517 | if (!tmp_part) { |
| 518 | printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); |
| 519 | goto out; |
| 520 | } |
| 521 | |
| 522 | memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); |
| 523 | tmp_part->index = cur_index; |
Jim Keniston | 690d1a9 | 2010-11-11 18:54:22 +0000 | [diff] [blame] | 524 | list_add_tail(&tmp_part->partition, &nvram_partitions); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | cur_index += phead.length * NVRAM_BLOCK_LEN; |
| 527 | } |
| 528 | err = 0; |
| 529 | |
Benjamin Herrenschmidt | edc79a2 | 2010-08-02 11:18:09 +1000 | [diff] [blame] | 530 | #ifdef DEBUG_NVRAM |
| 531 | nvram_print_partitions("NVRAM Partitions"); |
| 532 | #endif |
| 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | out: |
| 535 | kfree(header); |
| 536 | return err; |
| 537 | } |
| 538 | |
| 539 | static int __init nvram_init(void) |
| 540 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | int rc; |
| 542 | |
Benjamin Herrenschmidt | 578914c | 2010-07-29 17:21:17 +1000 | [diff] [blame] | 543 | BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); |
| 544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
| 546 | return -ENODEV; |
| 547 | |
| 548 | rc = misc_register(&nvram_dev); |
| 549 | if (rc != 0) { |
| 550 | printk(KERN_ERR "nvram_init: failed to register device\n"); |
| 551 | return rc; |
| 552 | } |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | return rc; |
| 555 | } |
| 556 | |
| 557 | void __exit nvram_cleanup(void) |
| 558 | { |
| 559 | misc_deregister( &nvram_dev ); |
| 560 | } |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | module_init(nvram_init); |
| 563 | module_exit(nvram_cleanup); |
| 564 | MODULE_LICENSE("GPL"); |