arch/x86/kernel/microcode_amd.c

   1 /*
   2  *  AMD CPU Microcode Update Driver for Linux
   3  *  Copyright (C) 2008 Advanced Micro Devices Inc.
   4  *
   5  *  Author: Peter Oruba <peter.oruba@amd.com>
   6  *
   7  *  Based on work by:
   8  *  Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
   9  *
  10  *  This driver allows to upgrade microcode on AMD
  11  *  family 0x10 and 0x11 processors.
  12  *
  13  *  Licensed unter the terms of the GNU General Public
  14  *  License version 2. See file COPYING for details.
  15 */
  16
  17 #include <linux/capability.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/sched.h>
  21 #include <linux/cpumask.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/miscdevice.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/mm.h>
  28 #include <linux/fs.h>
  29 #include <linux/mutex.h>
  30 #include <linux/cpu.h>
  31 #include <linux/firmware.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/pci.h>
  34 #include <linux/pci_ids.h>
  35
  36 #include <asm/msr.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/processor.h>
  39 #include <asm/microcode.h>
  40
  41 MODULE_DESCRIPTION("AMD Microcode Update Driver");
  42 MODULE_AUTHOR("Peter Oruba");
  43 MODULE_LICENSE("GPL v2");
  44
  45 #define UCODE_MAGIC                0x00414d44
  46 #define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
  47 #define UCODE_UCODE_TYPE           0x00000001
  48
  49 struct equiv_cpu_entry {
  50         unsigned int installed_cpu;
  51         unsigned int fixed_errata_mask;
  52         unsigned int fixed_errata_compare;
  53         unsigned int equiv_cpu;
  54 };
  55
  56 struct microcode_header_amd {
  57         unsigned int  data_code;
  58         unsigned int  patch_id;
  59         unsigned char mc_patch_data_id[2];
  60         unsigned char mc_patch_data_len;
  61         unsigned char init_flag;
  62         unsigned int  mc_patch_data_checksum;
  63         unsigned int  nb_dev_id;
  64         unsigned int  sb_dev_id;
  65         u16 processor_rev_id;
  66         unsigned char nb_rev_id;
  67         unsigned char sb_rev_id;
  68         unsigned char bios_api_rev;
  69         unsigned char reserved1[3];
  70         unsigned int  match_reg[8];
  71 };
  72
  73 struct microcode_amd {
  74         struct microcode_header_amd hdr;
  75         unsigned int mpb[0];
  76 };
  77
  78 #define UCODE_MAX_SIZE          (2048)
  79 #define DEFAULT_UCODE_DATASIZE  (896)
  80 #define MC_HEADER_SIZE          (sizeof(struct microcode_header_amd))
  81 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
  82 #define DWSIZE                  (sizeof(u32))
  83 /* For now we support a fixed ucode total size only */
  84 #define get_totalsize(mc) \
  85         ((((struct microcode_amd *)mc)->hdr.mc_patch_data_len * 28) \
  86          + MC_HEADER_SIZE)
  87
  88 /* serialize access to the physical write */
  89 static DEFINE_SPINLOCK(microcode_update_lock);
  90
  91 static struct equiv_cpu_entry *equiv_cpu_table;
  92
  93 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
  94 {
  95         struct cpuinfo_x86 *c = &cpu_data(cpu);
  96
  97         memset(csig, 0, sizeof(*csig));
  98
  99         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
 100                 printk(KERN_ERR "microcode: CPU%d not a capable AMD processor\n",
 101                        cpu);
 102                 return -1;
 103         }
 104
 105         asm volatile("movl %1, %%ecx; rdmsr"
 106                      : "=a" (csig->rev)
 107                      : "i" (0x0000008B) : "ecx");
 108
 109         printk(KERN_INFO "microcode: collect_cpu_info_amd : patch_id=0x%x\n",
 110                 csig->rev);
 111
 112         return 0;
 113 }
 114
 115 static int get_matching_microcode(int cpu, void *mc, int rev)
 116 {
 117         struct microcode_header_amd *mc_header = mc;
 118         struct pci_dev *nb_pci_dev, *sb_pci_dev;
 119         unsigned int current_cpu_id;
 120         unsigned int equiv_cpu_id = 0x00;
 121         unsigned int i = 0;
 122
 123         BUG_ON(equiv_cpu_table == NULL);
 124         current_cpu_id = cpuid_eax(0x00000001);
 125
 126         while (equiv_cpu_table[i].installed_cpu != 0) {
 127                 if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
 128                         equiv_cpu_id = equiv_cpu_table[i].equiv_cpu & 0xffff;
 129                         break;
 130                 }
 131                 i++;
 132         }
 133
 134         if (!equiv_cpu_id) {
 135                 printk(KERN_ERR "microcode: CPU%d cpu_id "
 136                        "not found in equivalent cpu table \n", cpu);
 137                 return 0;
 138         }
 139
 140         if (mc_header->processor_rev_id != equiv_cpu_id) {
 141                 printk(KERN_ERR "microcode: CPU%d patch does not match "
 142                        "(processor_rev_id: %x, eqiv_cpu_id: %x)\n",
 143                        cpu, mc_header->processor_rev_id, equiv_cpu_id);
 144                 return 0;
 145         }
 146
 147         /* ucode may be northbridge specific */
 148         if (mc_header->nb_dev_id) {
 149                 nb_pci_dev = pci_get_device(PCI_VENDOR_ID_AMD,
 150                                             (mc_header->nb_dev_id & 0xff),
 151                                             NULL);
 152                 if ((!nb_pci_dev) ||
 153                     (mc_header->nb_rev_id != nb_pci_dev->revision)) {
 154                         printk(KERN_ERR "microcode: CPU%d NB mismatch \n", cpu);
 155                         pci_dev_put(nb_pci_dev);
 156                         return 0;
 157                 }
 158                 pci_dev_put(nb_pci_dev);
 159         }
 160
 161         /* ucode may be southbridge specific */
 162         if (mc_header->sb_dev_id) {
 163                 sb_pci_dev = pci_get_device(PCI_VENDOR_ID_AMD,
 164                                             (mc_header->sb_dev_id & 0xff),
 165                                             NULL);
 166                 if ((!sb_pci_dev) ||
 167                     (mc_header->sb_rev_id != sb_pci_dev->revision)) {
 168                         printk(KERN_ERR "microcode: CPU%d SB mismatch \n", cpu);
 169                         pci_dev_put(sb_pci_dev);
 170                         return 0;
 171                 }
 172                 pci_dev_put(sb_pci_dev);
 173         }
 174
 175         if (mc_header->patch_id <= rev)
 176                 return 0;
 177
 178         return 1;
 179 }
 180
 181 static void apply_microcode_amd(int cpu)
 182 {
 183         unsigned long flags;
 184         unsigned int eax, edx;
 185         unsigned int rev;
 186         int cpu_num = raw_smp_processor_id();
 187         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 188         struct microcode_amd *mc_amd = uci->mc;
 189         unsigned long addr;
 190
 191         /* We should bind the task to the CPU */
 192         BUG_ON(cpu_num != cpu);
 193
 194         if (mc_amd == NULL)
 195                 return;
 196
 197         spin_lock_irqsave(&microcode_update_lock, flags);
 198
 199         addr = (unsigned long)&mc_amd->hdr.data_code;
 200         edx = (unsigned int)(((unsigned long)upper_32_bits(addr)));
 201         eax = (unsigned int)(((unsigned long)lower_32_bits(addr)));
 202
 203         asm volatile("movl %0, %%ecx; wrmsr" :
 204                      : "i" (0xc0010020), "a" (eax), "d" (edx) : "ecx");
 205
 206         /* get patch id after patching */
 207         asm volatile("movl %1, %%ecx; rdmsr"
 208                      : "=a" (rev)
 209                      : "i" (0x0000008B) : "ecx");
 210
 211         spin_unlock_irqrestore(&microcode_update_lock, flags);
 212
 213         /* check current patch id and patch's id for match */
 214         if (rev != mc_amd->hdr.patch_id) {
 215                 printk(KERN_ERR "microcode: CPU%d update from revision "
 216                        "0x%x to 0x%x failed\n", cpu_num,
 217                        mc_amd->hdr.patch_id, rev);
 218                 return;
 219         }
 220
 221         printk(KERN_INFO "microcode: CPU%d updated from revision "
 222                "0x%x to 0x%x \n",
 223                cpu_num, uci->cpu_sig.rev, mc_amd->hdr.patch_id);
 224
 225         uci->cpu_sig.rev = rev;
 226 }
 227
 228 static void * get_next_ucode(u8 *buf, unsigned int size,
 229                         int (*get_ucode_data)(void *, const void *, size_t),
 230                         unsigned int *mc_size)
 231 {
 232         unsigned int total_size;
 233 #define UCODE_CONTAINER_SECTION_HDR     8
 234         u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
 235         void *mc;
 236
 237         if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
 238                 return NULL;
 239
 240         if (section_hdr[0] != UCODE_UCODE_TYPE) {
 241                 printk(KERN_ERR "microcode: error! "
 242                        "Wrong microcode payload type field\n");
 243                 return NULL;
 244         }
 245
 246         total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8));
 247
 248         printk(KERN_INFO "microcode: size %u, total_size %u\n",
 249                 size, total_size);
 250
 251         if (total_size > size || total_size > UCODE_MAX_SIZE) {
 252                 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
 253                 return NULL;
 254         }
 255
 256         mc = vmalloc(UCODE_MAX_SIZE);
 257         if (mc) {
 258                 memset(mc, 0, UCODE_MAX_SIZE);
 259                 if (get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR, total_size)) {
 260                         vfree(mc);
 261                         mc = NULL;
 262                 } else
 263                         *mc_size = total_size + UCODE_CONTAINER_SECTION_HDR;
 264         }
 265 #undef UCODE_CONTAINER_SECTION_HDR
 266         return mc;
 267 }
 268
 269
 270 static int install_equiv_cpu_table(u8 *buf,
 271                 int (*get_ucode_data)(void *, const void *, size_t))
 272 {
 273 #define UCODE_CONTAINER_HEADER_SIZE     12
 274         u8 *container_hdr[UCODE_CONTAINER_HEADER_SIZE];
 275         unsigned int *buf_pos = (unsigned int *)container_hdr;
 276         unsigned long size;
 277
 278         if (get_ucode_data(&container_hdr, buf, UCODE_CONTAINER_HEADER_SIZE))
 279                 return 0;
 280
 281         size = buf_pos[2];
 282
 283         if (buf_pos[1] != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
 284                 printk(KERN_ERR "microcode: error! "
 285                        "Wrong microcode equivalnet cpu table\n");
 286                 return 0;
 287         }
 288
 289         equiv_cpu_table = (struct equiv_cpu_entry *) vmalloc(size);
 290         if (!equiv_cpu_table) {
 291                 printk(KERN_ERR "microcode: error, can't allocate memory for equiv CPU table\n");
 292                 return 0;
 293         }
 294
 295         buf += UCODE_CONTAINER_HEADER_SIZE;
 296         if (get_ucode_data(equiv_cpu_table, buf, size)) {
 297                 vfree(equiv_cpu_table);
 298                 return 0;
 299         }
 300
 301         return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
 302 #undef UCODE_CONTAINER_HEADER_SIZE
 303 }
 304
 305 static void free_equiv_cpu_table(void)
 306 {
 307         if (equiv_cpu_table) {
 308                 vfree(equiv_cpu_table);
 309                 equiv_cpu_table = NULL;
 310         }
 311 }
 312
 313 static int generic_load_microcode(int cpu, void *data, size_t size,
 314                 int (*get_ucode_data)(void *, const void *, size_t))
 315 {
 316         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 317         u8 *ucode_ptr = data, *new_mc = NULL, *mc;
 318         int new_rev = uci->cpu_sig.rev;
 319         unsigned int leftover;
 320         unsigned long offset;
 321
 322         offset = install_equiv_cpu_table(ucode_ptr, get_ucode_data);
 323         if (!offset) {
 324                 printk(KERN_ERR "microcode: installing equivalent cpu table failed\n");
 325                 return -EINVAL;
 326         }
 327
 328         ucode_ptr += offset;
 329         leftover = size - offset;
 330
 331         while (leftover) {
 332                 unsigned int uninitialized_var(mc_size);
 333                 struct microcode_header_amd *mc_header;
 334
 335                 mc = get_next_ucode(ucode_ptr, leftover, get_ucode_data, &mc_size);
 336                 if (!mc)
 337                         break;
 338
 339                 mc_header = (struct microcode_header_amd *)mc;
 340                 if (get_matching_microcode(cpu, mc, new_rev)) {
 341                         if (new_mc)
 342                                 vfree(new_mc);
 343                         new_rev = mc_header->patch_id;
 344                         new_mc  = mc;
 345                 } else
 346                         vfree(mc);
 347
 348                 ucode_ptr += mc_size;
 349                 leftover  -= mc_size;
 350         }
 351
 352         if (new_mc) {
 353                 if (!leftover) {
 354                         if (uci->mc)
 355                                 vfree(uci->mc);
 356                         uci->mc = new_mc;
 357                         pr_debug("microcode: CPU%d found a matching microcode update with"
 358                                 " version 0x%x (current=0x%x)\n",
 359                                 cpu, new_rev, uci->cpu_sig.rev);
 360                 } else
 361                         vfree(new_mc);
 362         }
 363
 364         free_equiv_cpu_table();
 365
 366         return (int)leftover;
 367 }
 368
 369 static int get_ucode_fw(void *to, const void *from, size_t n)
 370 {
 371         memcpy(to, from, n);
 372         return 0;
 373 }
 374
 375 static int request_microcode_fw(int cpu, struct device *device)
 376 {
 377         const char *fw_name = "amd-ucode/microcode_amd.bin";
 378         const struct firmware *firmware;
 379         int ret;
 380
 381         /* We should bind the task to the CPU */
 382         BUG_ON(cpu != raw_smp_processor_id());
 383
 384         ret = request_firmware(&firmware, fw_name, device);
 385         if (ret) {
 386                 printk(KERN_ERR "microcode: ucode data file %s load failed\n", fw_name);
 387                 return ret;
 388         }
 389
 390         ret = generic_load_microcode(cpu, (void*)firmware->data, firmware->size,
 391                         &get_ucode_fw);
 392
 393         release_firmware(firmware);
 394
 395         return ret;
 396 }
 397
 398 static int request_microcode_user(int cpu, const void __user *buf, size_t size)
 399 {
 400         printk(KERN_WARNING "microcode: AMD microcode update via /dev/cpu/microcode"
 401                         "is not supported\n");
 402         return -1;
 403 }
 404
 405 static void microcode_fini_cpu_amd(int cpu)
 406 {
 407         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 408
 409         vfree(uci->mc);
 410         uci->mc = NULL;
 411 }
 412
 413 static struct microcode_ops microcode_amd_ops = {
 414         .request_microcode_user           = request_microcode_user,
 415         .request_microcode_fw             = request_microcode_fw,
 416         .collect_cpu_info                 = collect_cpu_info_amd,
 417         .apply_microcode                  = apply_microcode_amd,
 418         .microcode_fini_cpu               = microcode_fini_cpu_amd,
 419 };
 420
 421 struct microcode_ops * __init init_amd_microcode(void)
 422 {
 423         return &microcode_amd_ops;
 424 }