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 under the terms of the GNU General Public
  14  *  License version 2. See file COPYING for details.
  15  */
  16 #include <linux/firmware.h>
  17 #include <linux/pci_ids.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23
  24 #include <asm/microcode.h>
  25 #include <asm/processor.h>
  26 #include <asm/msr.h>
  27
  28 MODULE_DESCRIPTION("AMD Microcode Update Driver");
  29 MODULE_AUTHOR("Peter Oruba");
  30 MODULE_LICENSE("GPL v2");
  31
  32 #define UCODE_MAGIC                0x00414d44
  33 #define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
  34 #define UCODE_UCODE_TYPE           0x00000001
  35
  36 struct equiv_cpu_entry {
  37         u32     installed_cpu;
  38         u32     fixed_errata_mask;
  39         u32     fixed_errata_compare;
  40         u16     equiv_cpu;
  41         u16     res;
  42 } __attribute__((packed));
  43
  44 struct microcode_header_amd {
  45         u32     data_code;
  46         u32     patch_id;
  47         u16     mc_patch_data_id;
  48         u8      mc_patch_data_len;
  49         u8      init_flag;
  50         u32     mc_patch_data_checksum;
  51         u32     nb_dev_id;
  52         u32     sb_dev_id;
  53         u16     processor_rev_id;
  54         u8      nb_rev_id;
  55         u8      sb_rev_id;
  56         u8      bios_api_rev;
  57         u8      reserved1[3];
  58         u32     match_reg[8];
  59 } __attribute__((packed));
  60
  61 struct microcode_amd {
  62         struct microcode_header_amd     hdr;
  63         unsigned int                    mpb[0];
  64 };
  65
  66 #define UCODE_MAX_SIZE                  2048
  67 #define UCODE_CONTAINER_SECTION_HDR     8
  68 #define UCODE_CONTAINER_HEADER_SIZE     12
  69
  70 static struct equiv_cpu_entry *equiv_cpu_table;
  71
  72 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
  73 {
  74         struct cpuinfo_x86 *c = &cpu_data(cpu);
  75         u32 dummy;
  76
  77         memset(csig, 0, sizeof(*csig));
  78         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
  79                 printk(KERN_WARNING "microcode: CPU%d: AMD CPU family 0x%x not "
  80                        "supported\n", cpu, c->x86);
  81                 return -1;
  82         }
  83         rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
  84         printk(KERN_INFO "microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
  85         return 0;
  86 }
  87
  88 static int get_matching_microcode(int cpu, void *mc, int rev)
  89 {
  90         struct microcode_header_amd *mc_header = mc;
  91         unsigned int current_cpu_id;
  92         u16 equiv_cpu_id = 0;
  93         unsigned int i = 0;
  94
  95         BUG_ON(equiv_cpu_table == NULL);
  96         current_cpu_id = cpuid_eax(0x00000001);
  97
  98         while (equiv_cpu_table[i].installed_cpu != 0) {
  99                 if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
 100                         equiv_cpu_id = equiv_cpu_table[i].equiv_cpu;
 101                         break;
 102                 }
 103                 i++;
 104         }
 105
 106         if (!equiv_cpu_id) {
 107                 printk(KERN_WARNING "microcode: CPU%d: cpu revision "
 108                        "not listed in equivalent cpu table\n", cpu);
 109                 return 0;
 110         }
 111
 112         if (mc_header->processor_rev_id != equiv_cpu_id) {
 113                 printk(KERN_ERR "microcode: CPU%d: patch mismatch "
 114                        "(processor_rev_id: %x, equiv_cpu_id: %x)\n",
 115                        cpu, mc_header->processor_rev_id, equiv_cpu_id);
 116                 return 0;
 117         }
 118
 119         /* ucode might be chipset specific -- currently we don't support this */
 120         if (mc_header->nb_dev_id || mc_header->sb_dev_id) {
 121                 printk(KERN_ERR "microcode: CPU%d: loading of chipset "
 122                        "specific code not yet supported\n", cpu);
 123                 return 0;
 124         }
 125
 126         if (mc_header->patch_id <= rev)
 127                 return 0;
 128
 129         return 1;
 130 }
 131
 132 static int apply_microcode_amd(int cpu)
 133 {
 134         u32 rev, dummy;
 135         int cpu_num = raw_smp_processor_id();
 136         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 137         struct microcode_amd *mc_amd = uci->mc;
 138
 139         /* We should bind the task to the CPU */
 140         BUG_ON(cpu_num != cpu);
 141
 142         if (mc_amd == NULL)
 143                 return 0;
 144
 145         wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
 146         /* get patch id after patching */
 147         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 148
 149         /* check current patch id and patch's id for match */
 150         if (rev != mc_amd->hdr.patch_id) {
 151                 printk(KERN_ERR "microcode: CPU%d: update failed "
 152                        "(for patch_level=0x%x)\n", cpu, mc_amd->hdr.patch_id);
 153                 return -1;
 154         }
 155
 156         printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
 157                cpu, rev);
 158
 159         uci->cpu_sig.rev = rev;
 160
 161         return 0;
 162 }
 163
 164 static int get_ucode_data(void *to, const u8 *from, size_t n)
 165 {
 166         memcpy(to, from, n);
 167         return 0;
 168 }
 169
 170 static void *
 171 get_next_ucode(const u8 *buf, unsigned int size, unsigned int *mc_size)
 172 {
 173         unsigned int total_size;
 174         u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
 175         void *mc;
 176
 177         if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
 178                 return NULL;
 179
 180         if (section_hdr[0] != UCODE_UCODE_TYPE) {
 181                 printk(KERN_ERR "microcode: error: invalid type field in "
 182                        "container file section header\n");
 183                 return NULL;
 184         }
 185
 186         total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8));
 187
 188         printk(KERN_DEBUG "microcode: size %u, total_size %u\n",
 189                size, total_size);
 190
 191         if (total_size > size || total_size > UCODE_MAX_SIZE) {
 192                 printk(KERN_ERR "microcode: error: size mismatch\n");
 193                 return NULL;
 194         }
 195
 196         mc = vmalloc(UCODE_MAX_SIZE);
 197         if (mc) {
 198                 memset(mc, 0, UCODE_MAX_SIZE);
 199                 if (get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR,
 200                                    total_size)) {
 201                         vfree(mc);
 202                         mc = NULL;
 203                 } else
 204                         *mc_size = total_size + UCODE_CONTAINER_SECTION_HDR;
 205         }
 206         return mc;
 207 }
 208
 209 static int install_equiv_cpu_table(const u8 *buf)
 210 {
 211         u8 *container_hdr[UCODE_CONTAINER_HEADER_SIZE];
 212         unsigned int *buf_pos = (unsigned int *)container_hdr;
 213         unsigned long size;
 214
 215         if (get_ucode_data(&container_hdr, buf, UCODE_CONTAINER_HEADER_SIZE))
 216                 return 0;
 217
 218         size = buf_pos[2];
 219
 220         if (buf_pos[1] != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
 221                 printk(KERN_ERR "microcode: error: invalid type field in "
 222                        "container file section header\n");
 223                 return 0;
 224         }
 225
 226         equiv_cpu_table = (struct equiv_cpu_entry *) vmalloc(size);
 227         if (!equiv_cpu_table) {
 228                 printk(KERN_ERR "microcode: failed to allocate "
 229                        "equivalent CPU table\n");
 230                 return 0;
 231         }
 232
 233         buf += UCODE_CONTAINER_HEADER_SIZE;
 234         if (get_ucode_data(equiv_cpu_table, buf, size)) {
 235                 vfree(equiv_cpu_table);
 236                 return 0;
 237         }
 238
 239         return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
 240 }
 241
 242 static void free_equiv_cpu_table(void)
 243 {
 244         vfree(equiv_cpu_table);
 245         equiv_cpu_table = NULL;
 246 }
 247
 248 static enum ucode_state
 249 generic_load_microcode(int cpu, const u8 *data, size_t size)
 250 {
 251         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 252         const u8 *ucode_ptr = data;
 253         void *new_mc = NULL;
 254         void *mc;
 255         int new_rev = uci->cpu_sig.rev;
 256         unsigned int leftover;
 257         unsigned long offset;
 258         enum ucode_state state = UCODE_OK;
 259
 260         offset = install_equiv_cpu_table(ucode_ptr);
 261         if (!offset) {
 262                 printk(KERN_ERR "microcode: failed to create "
 263                        "equivalent cpu table\n");
 264                 return UCODE_ERROR;
 265         }
 266
 267         ucode_ptr += offset;
 268         leftover = size - offset;
 269
 270         while (leftover) {
 271                 unsigned int uninitialized_var(mc_size);
 272                 struct microcode_header_amd *mc_header;
 273
 274                 mc = get_next_ucode(ucode_ptr, leftover, &mc_size);
 275                 if (!mc)
 276                         break;
 277
 278                 mc_header = (struct microcode_header_amd *)mc;
 279                 if (get_matching_microcode(cpu, mc, new_rev)) {
 280                         vfree(new_mc);
 281                         new_rev = mc_header->patch_id;
 282                         new_mc  = mc;
 283                 } else
 284                         vfree(mc);
 285
 286                 ucode_ptr += mc_size;
 287                 leftover  -= mc_size;
 288         }
 289
 290         if (new_mc) {
 291                 if (!leftover) {
 292                         vfree(uci->mc);
 293                         uci->mc = new_mc;
 294                         pr_debug("microcode: CPU%d found a matching microcode "
 295                                  "update with version 0x%x (current=0x%x)\n",
 296                                  cpu, new_rev, uci->cpu_sig.rev);
 297                 } else {
 298                         vfree(new_mc);
 299                         state = UCODE_ERROR;
 300                 }
 301         } else
 302                 state = UCODE_NFOUND;
 303
 304         free_equiv_cpu_table();
 305
 306         return state;
 307 }
 308
 309 static enum ucode_state request_microcode_fw(int cpu, struct device *device)
 310 {
 311         const char *fw_name = "amd-ucode/microcode_amd.bin";
 312         const struct firmware *firmware;
 313         enum ucode_state ret;
 314
 315         if (request_firmware(&firmware, fw_name, device)) {
 316                 printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
 317                 return UCODE_NFOUND;
 318         }
 319
 320         ret = generic_load_microcode(cpu, firmware->data, firmware->size);
 321
 322         release_firmware(firmware);
 323
 324         return ret;
 325 }
 326
 327 static enum ucode_state
 328 request_microcode_user(int cpu, const void __user *buf, size_t size)
 329 {
 330         printk(KERN_INFO "microcode: AMD microcode update via "
 331                "/dev/cpu/microcode not supported\n");
 332         return UCODE_ERROR;
 333 }
 334
 335 static void microcode_fini_cpu_amd(int cpu)
 336 {
 337         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 338
 339         vfree(uci->mc);
 340         uci->mc = NULL;
 341 }
 342
 343 static struct microcode_ops microcode_amd_ops = {
 344         .request_microcode_user           = request_microcode_user,
 345         .request_microcode_fw             = request_microcode_fw,
 346         .collect_cpu_info                 = collect_cpu_info_amd,
 347         .apply_microcode                  = apply_microcode_amd,
 348         .microcode_fini_cpu               = microcode_fini_cpu_amd,
 349 };
 350
 351 struct microcode_ops * __init init_amd_microcode(void)
 352 {
 353         return &microcode_amd_ops;
 354 }