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_CONTAINER_SECTION_HDR     8
  67 #define UCODE_CONTAINER_HEADER_SIZE     12
  68
  69 static struct equiv_cpu_entry *equiv_cpu_table;
  70
  71 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
  72 {
  73         struct cpuinfo_x86 *c = &cpu_data(cpu);
  74         u32 dummy;
  75
  76         memset(csig, 0, sizeof(*csig));
  77         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
  78                 printk(KERN_WARNING "microcode: CPU%d: AMD CPU family 0x%x not "
  79                        "supported\n", cpu, c->x86);
  80                 return -1;
  81         }
  82         rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
  83         printk(KERN_INFO "microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
  84         return 0;
  85 }
  86
  87 static int get_matching_microcode(int cpu, void *mc, int rev)
  88 {
  89         struct microcode_header_amd *mc_header = mc;
  90         unsigned int current_cpu_id;
  91         u16 equiv_cpu_id = 0;
  92         unsigned int i = 0;
  93
  94         BUG_ON(equiv_cpu_table == NULL);
  95         current_cpu_id = cpuid_eax(0x00000001);
  96
  97         while (equiv_cpu_table[i].installed_cpu != 0) {
  98                 if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
  99                         equiv_cpu_id = equiv_cpu_table[i].equiv_cpu;
 100                         break;
 101                 }
 102                 i++;
 103         }
 104
 105         if (!equiv_cpu_id) {
 106                 printk(KERN_WARNING "microcode: CPU%d: cpu revision "
 107                        "not listed in equivalent cpu table\n", cpu);
 108                 return 0;
 109         }
 110
 111         if (mc_header->processor_rev_id != equiv_cpu_id)
 112                 return 0;
 113
 114         /* ucode might be chipset specific -- currently we don't support this */
 115         if (mc_header->nb_dev_id || mc_header->sb_dev_id) {
 116                 printk(KERN_ERR "microcode: CPU%d: loading of chipset "
 117                        "specific code not yet supported\n", cpu);
 118                 return 0;
 119         }
 120
 121         if (mc_header->patch_id <= rev)
 122                 return 0;
 123
 124         return 1;
 125 }
 126
 127 static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
 128 {
 129         struct cpuinfo_x86 *c = &cpu_data(cpu);
 130         unsigned int max_size, actual_size;
 131
 132 #define F1XH_MPB_MAX_SIZE 2048
 133 #define F14H_MPB_MAX_SIZE 1824
 134 #define F15H_MPB_MAX_SIZE 4096
 135
 136         switch (c->x86) {
 137         case 0x14:
 138                 max_size = F14H_MPB_MAX_SIZE;
 139                 break;
 140         case 0x15:
 141                 max_size = F15H_MPB_MAX_SIZE;
 142                 break;
 143         default:
 144                 max_size = F1XH_MPB_MAX_SIZE;
 145                 break;
 146         }
 147
 148         actual_size = buf[4] + (buf[5] << 8);
 149
 150         if (actual_size > size || actual_size > max_size) {
 151                 pr_err("section size mismatch\n");
 152                 return 0;
 153         }
 154
 155         return actual_size;
 156 }
 157
 158 static int apply_microcode_amd(int cpu)
 159 {
 160         u32 rev, dummy;
 161         int cpu_num = raw_smp_processor_id();
 162         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 163         struct microcode_amd *mc_amd = uci->mc;
 164
 165         /* We should bind the task to the CPU */
 166         BUG_ON(cpu_num != cpu);
 167
 168         if (mc_amd == NULL)
 169                 return 0;
 170
 171         wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
 172         /* get patch id after patching */
 173         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 174
 175         /* check current patch id and patch's id for match */
 176         if (rev != mc_amd->hdr.patch_id) {
 177                 printk(KERN_ERR "microcode: CPU%d: update failed "
 178                        "(for patch_level=0x%x)\n", cpu, mc_amd->hdr.patch_id);
 179                 return -1;
 180         }
 181
 182         printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
 183                cpu, rev);
 184
 185         uci->cpu_sig.rev = rev;
 186
 187         return 0;
 188 }
 189
 190 static int get_ucode_data(void *to, const u8 *from, size_t n)
 191 {
 192         memcpy(to, from, n);
 193         return 0;
 194 }
 195
 196 static void *
 197 get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size)
 198 {
 199         unsigned int actual_size = 0;
 200         u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
 201         void *mc = NULL;
 202
 203         if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
 204                 return NULL;
 205
 206         if (section_hdr[0] != UCODE_UCODE_TYPE) {
 207                 printk(KERN_ERR "microcode: error: invalid type field in "
 208                        "container file section header\n");
 209                 return NULL;
 210         }
 211
 212         actual_size = verify_ucode_size(cpu, buf, size);
 213         if (!actual_size)
 214                 return NULL;
 215
 216         mc = vmalloc(actual_size);
 217         if (!mc)
 218                 return NULL;
 219
 220         memset(mc, 0, actual_size);
 221         get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR, actual_size);
 222         *mc_size = actual_size + UCODE_CONTAINER_SECTION_HDR;
 223
 224         return mc;
 225 }
 226
 227 static int install_equiv_cpu_table(const u8 *buf)
 228 {
 229         u8 *container_hdr[UCODE_CONTAINER_HEADER_SIZE];
 230         unsigned int *buf_pos = (unsigned int *)container_hdr;
 231         unsigned long size;
 232
 233         if (get_ucode_data(&container_hdr, buf, UCODE_CONTAINER_HEADER_SIZE))
 234                 return 0;
 235
 236         size = buf_pos[2];
 237
 238         if (buf_pos[1] != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
 239                 printk(KERN_ERR "microcode: error: invalid type field in "
 240                        "container file section header\n");
 241                 return 0;
 242         }
 243
 244         equiv_cpu_table = (struct equiv_cpu_entry *) vmalloc(size);
 245         if (!equiv_cpu_table) {
 246                 printk(KERN_ERR "microcode: failed to allocate "
 247                        "equivalent CPU table\n");
 248                 return 0;
 249         }
 250
 251         buf += UCODE_CONTAINER_HEADER_SIZE;
 252         if (get_ucode_data(equiv_cpu_table, buf, size)) {
 253                 vfree(equiv_cpu_table);
 254                 return 0;
 255         }
 256
 257         return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
 258 }
 259
 260 static void free_equiv_cpu_table(void)
 261 {
 262         vfree(equiv_cpu_table);
 263         equiv_cpu_table = NULL;
 264 }
 265
 266 static enum ucode_state
 267 generic_load_microcode(int cpu, const u8 *data, size_t size)
 268 {
 269         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 270         const u8 *ucode_ptr = data;
 271         void *new_mc = NULL;
 272         void *mc;
 273         int new_rev = uci->cpu_sig.rev;
 274         unsigned int leftover;
 275         unsigned long offset;
 276         enum ucode_state state = UCODE_OK;
 277
 278         offset = install_equiv_cpu_table(ucode_ptr);
 279         if (!offset) {
 280                 printk(KERN_ERR "microcode: failed to create "
 281                        "equivalent cpu table\n");
 282                 return UCODE_ERROR;
 283         }
 284
 285         ucode_ptr += offset;
 286         leftover = size - offset;
 287
 288         while (leftover) {
 289                 unsigned int uninitialized_var(mc_size);
 290                 struct microcode_header_amd *mc_header;
 291
 292                 mc = get_next_ucode(cpu, ucode_ptr, leftover, &mc_size);
 293                 if (!mc)
 294                         break;
 295
 296                 mc_header = (struct microcode_header_amd *)mc;
 297                 if (get_matching_microcode(cpu, mc, new_rev)) {
 298                         vfree(new_mc);
 299                         new_rev = mc_header->patch_id;
 300                         new_mc  = mc;
 301                 } else
 302                         vfree(mc);
 303
 304                 ucode_ptr += mc_size;
 305                 leftover  -= mc_size;
 306         }
 307
 308         if (new_mc) {
 309                 if (!leftover) {
 310                         vfree(uci->mc);
 311                         uci->mc = new_mc;
 312                         pr_debug("microcode: CPU%d found a matching microcode "
 313                                  "update with version 0x%x (current=0x%x)\n",
 314                                  cpu, new_rev, uci->cpu_sig.rev);
 315                 } else {
 316                         vfree(new_mc);
 317                         state = UCODE_ERROR;
 318                 }
 319         } else
 320                 state = UCODE_NFOUND;
 321
 322         free_equiv_cpu_table();
 323
 324         return state;
 325 }
 326
 327 static enum ucode_state request_microcode_fw(int cpu, struct device *device)
 328 {
 329         const char *fw_name = "amd-ucode/microcode_amd.bin";
 330         const struct firmware *firmware;
 331         enum ucode_state ret;
 332
 333         if (request_firmware(&firmware, fw_name, device)) {
 334                 printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
 335                 return UCODE_NFOUND;
 336         }
 337
 338         if (*(u32 *)firmware->data != UCODE_MAGIC) {
 339                 printk(KERN_ERR "microcode: invalid UCODE_MAGIC (0x%08x)\n",
 340                        *(u32 *)firmware->data);
 341                 return UCODE_ERROR;
 342         }
 343
 344         ret = generic_load_microcode(cpu, firmware->data, firmware->size);
 345
 346         release_firmware(firmware);
 347
 348         return ret;
 349 }
 350
 351 static enum ucode_state
 352 request_microcode_user(int cpu, const void __user *buf, size_t size)
 353 {
 354         printk(KERN_INFO "microcode: AMD microcode update via "
 355                "/dev/cpu/microcode not supported\n");
 356         return UCODE_ERROR;
 357 }
 358
 359 static void microcode_fini_cpu_amd(int cpu)
 360 {
 361         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 362
 363         vfree(uci->mc);
 364         uci->mc = NULL;
 365 }
 366
 367 static struct microcode_ops microcode_amd_ops = {
 368         .request_microcode_user           = request_microcode_user,
 369         .request_microcode_fw             = request_microcode_fw,
 370         .collect_cpu_info                 = collect_cpu_info_amd,
 371         .apply_microcode                  = apply_microcode_amd,
 372         .microcode_fini_cpu               = microcode_fini_cpu_amd,
 373 };
 374
 375 struct microcode_ops * __init init_amd_microcode(void)
 376 {
 377         return &microcode_amd_ops;
 378 }