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
  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 #include <linux/uaccess.h>
  36
  37 #include <asm/msr.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         u32     installed_cpu;
  51         u32     fixed_errata_mask;
  52         u32     fixed_errata_compare;
  53         u16     equiv_cpu;
  54         u16     res;
  55 } __attribute__((packed));
  56
  57 struct microcode_header_amd {
  58         u32     data_code;
  59         u32     patch_id;
  60         u16     mc_patch_data_id;
  61         u8      mc_patch_data_len;
  62         u8      init_flag;
  63         u32     mc_patch_data_checksum;
  64         u32     nb_dev_id;
  65         u32     sb_dev_id;
  66         u16     processor_rev_id;
  67         u8      nb_rev_id;
  68         u8      sb_rev_id;
  69         u8      bios_api_rev;
  70         u8      reserved1[3];
  71         u32     match_reg[8];
  72 } __attribute__((packed));
  73
  74 struct microcode_amd {
  75         struct microcode_header_amd hdr;
  76         unsigned int mpb[0];
  77 };
  78
  79 #define UCODE_MAX_SIZE                  2048
  80 #define UCODE_CONTAINER_SECTION_HDR     8
  81 #define UCODE_CONTAINER_HEADER_SIZE     12
  82
  83 /* serialize access to the physical write */
  84 static DEFINE_SPINLOCK(microcode_update_lock);
  85
  86 static struct equiv_cpu_entry *equiv_cpu_table;
  87
  88 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
  89 {
  90         struct cpuinfo_x86 *c = &cpu_data(cpu);
  91         u32 dummy;
  92
  93         memset(csig, 0, sizeof(*csig));
  94         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
  95                 printk(KERN_WARNING "microcode: CPU%d: AMD CPU family 0x%x not "
  96                        "supported\n", cpu, c->x86);
  97                 return -1;
  98         }
  99         rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
 100         printk(KERN_INFO "microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
 101         return 0;
 102 }
 103
 104 static int get_matching_microcode(int cpu, void *mc, int rev)
 105 {
 106         struct microcode_header_amd *mc_header = mc;
 107         unsigned int current_cpu_id;
 108         u16 equiv_cpu_id = 0;
 109         unsigned int i = 0;
 110
 111         BUG_ON(equiv_cpu_table == NULL);
 112         current_cpu_id = cpuid_eax(0x00000001);
 113
 114         while (equiv_cpu_table[i].installed_cpu != 0) {
 115                 if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
 116                         equiv_cpu_id = equiv_cpu_table[i].equiv_cpu;
 117                         break;
 118                 }
 119                 i++;
 120         }
 121
 122         if (!equiv_cpu_id) {
 123                 printk(KERN_WARNING "microcode: CPU%d: cpu revision "
 124                        "not listed in equivalent cpu table\n", cpu);
 125                 return 0;
 126         }
 127
 128         if (mc_header->processor_rev_id != equiv_cpu_id) {
 129                 printk(KERN_ERR "microcode: CPU%d: patch mismatch "
 130                        "(processor_rev_id: %x, equiv_cpu_id: %x)\n",
 131                        cpu, mc_header->processor_rev_id, equiv_cpu_id);
 132                 return 0;
 133         }
 134
 135         /* ucode might be chipset specific -- currently we don't support this */
 136         if (mc_header->nb_dev_id || mc_header->sb_dev_id) {
 137                 printk(KERN_ERR "microcode: CPU%d: loading of chipset "
 138                        "specific code not yet supported\n", cpu);
 139                 return 0;
 140         }
 141
 142         if (mc_header->patch_id <= rev)
 143                 return 0;
 144
 145         return 1;
 146 }
 147
 148 static void apply_microcode_amd(int cpu)
 149 {
 150         unsigned long flags;
 151         u32 rev, dummy;
 152         int cpu_num = raw_smp_processor_id();
 153         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 154         struct microcode_amd *mc_amd = uci->mc;
 155
 156         /* We should bind the task to the CPU */
 157         BUG_ON(cpu_num != cpu);
 158
 159         if (mc_amd == NULL)
 160                 return;
 161
 162         spin_lock_irqsave(&microcode_update_lock, flags);
 163         wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
 164         /* get patch id after patching */
 165         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 166         spin_unlock_irqrestore(&microcode_update_lock, flags);
 167
 168         /* check current patch id and patch's id for match */
 169         if (rev != mc_amd->hdr.patch_id) {
 170                 printk(KERN_ERR "microcode: CPU%d: update failed "
 171                        "(for patch_level=0x%x)\n", cpu, mc_amd->hdr.patch_id);
 172                 return;
 173         }
 174
 175         printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
 176                cpu, rev);
 177
 178         uci->cpu_sig.rev = rev;
 179 }
 180
 181 static int get_ucode_data(void *to, const u8 *from, size_t n)
 182 {
 183         memcpy(to, from, n);
 184         return 0;
 185 }
 186
 187 static void *get_next_ucode(const u8 *buf, unsigned int size,
 188                             unsigned int *mc_size)
 189 {
 190         unsigned int total_size;
 191         u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
 192         void *mc;
 193
 194         if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
 195                 return NULL;
 196
 197         if (section_hdr[0] != UCODE_UCODE_TYPE) {
 198                 printk(KERN_ERR "microcode: error: invalid type field in "
 199                        "container file section header\n");
 200                 return NULL;
 201         }
 202
 203         total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8));
 204
 205         printk(KERN_DEBUG "microcode: size %u, total_size %u\n",
 206                size, total_size);
 207
 208         if (total_size > size || total_size > UCODE_MAX_SIZE) {
 209                 printk(KERN_ERR "microcode: error: size mismatch\n");
 210                 return NULL;
 211         }
 212
 213         mc = vmalloc(UCODE_MAX_SIZE);
 214         if (mc) {
 215                 memset(mc, 0, UCODE_MAX_SIZE);
 216                 if (get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR,
 217                                    total_size)) {
 218                         vfree(mc);
 219                         mc = NULL;
 220                 } else
 221                         *mc_size = total_size + UCODE_CONTAINER_SECTION_HDR;
 222         }
 223         return mc;
 224 }
 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         if (equiv_cpu_table) {
 263                 vfree(equiv_cpu_table);
 264                 equiv_cpu_table = NULL;
 265         }
 266 }
 267
 268 static int generic_load_microcode(int cpu, const u8 *data, size_t size)
 269 {
 270         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 271         const u8 *ucode_ptr = data;
 272         void *new_mc = NULL;
 273         void *mc;
 274         int new_rev = uci->cpu_sig.rev;
 275         unsigned int leftover;
 276         unsigned long offset;
 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 -EINVAL;
 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(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                         if (new_mc)
 299                                 vfree(new_mc);
 300                         new_rev = mc_header->patch_id;
 301                         new_mc  = mc;
 302                 } else
 303                         vfree(mc);
 304
 305                 ucode_ptr += mc_size;
 306                 leftover  -= mc_size;
 307         }
 308
 309         if (new_mc) {
 310                 if (!leftover) {
 311                         if (uci->mc)
 312                                 vfree(uci->mc);
 313                         uci->mc = new_mc;
 314                         pr_debug("microcode: CPU%d found a matching microcode "
 315                                  "update with version 0x%x (current=0x%x)\n",
 316                                  cpu, new_rev, uci->cpu_sig.rev);
 317                 } else
 318                         vfree(new_mc);
 319         }
 320
 321         free_equiv_cpu_table();
 322
 323         return (int)leftover;
 324 }
 325
 326 static int request_microcode_fw(int cpu, struct device *device)
 327 {
 328         const char *fw_name = "amd-ucode/microcode_amd.bin";
 329         const struct firmware *firmware;
 330         int ret;
 331
 332         /* We should bind the task to the CPU */
 333         BUG_ON(cpu != raw_smp_processor_id());
 334
 335         ret = request_firmware(&firmware, fw_name, device);
 336         if (ret) {
 337                 printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
 338                 return ret;
 339         }
 340
 341         ret = generic_load_microcode(cpu, firmware->data, firmware->size);
 342
 343         release_firmware(firmware);
 344
 345         return ret;
 346 }
 347
 348 static int request_microcode_user(int cpu, const void __user *buf, size_t size)
 349 {
 350         printk(KERN_INFO "microcode: AMD microcode update via "
 351                "/dev/cpu/microcode not supported\n");
 352         return -1;
 353 }
 354
 355 static void microcode_fini_cpu_amd(int cpu)
 356 {
 357         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 358
 359         vfree(uci->mc);
 360         uci->mc = NULL;
 361 }
 362
 363 static struct microcode_ops microcode_amd_ops = {
 364         .request_microcode_user           = request_microcode_user,
 365         .request_microcode_fw             = request_microcode_fw,
 366         .collect_cpu_info                 = collect_cpu_info_amd,
 367         .apply_microcode                  = apply_microcode_amd,
 368         .microcode_fini_cpu               = microcode_fini_cpu_amd,
 369 };
 370
 371 struct microcode_ops * __init init_amd_microcode(void)
 372 {
 373         return &microcode_amd_ops;
 374 }
 375