1 /* 2 * Intel CPU Microcode Update Driver for Linux 3 * 4 * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> 5 * 2006 Shaohua Li <shaohua.li@intel.com> 6 * 7 * This driver allows to upgrade microcode on Intel processors 8 * belonging to IA-32 family - PentiumPro, Pentium II, 9 * Pentium III, Xeon, Pentium 4, etc. 10 * 11 * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture 12 * Software Developer's Manual 13 * Order Number 253668 or free download from: 14 * 15 * http://developer.intel.com/Assets/PDF/manual/253668.pdf 16 * 17 * For more information, go to http://www.urbanmyth.org/microcode 18 * 19 * This program is free software; you can redistribute it and/or 20 * modify it under the terms of the GNU General Public License 21 * as published by the Free Software Foundation; either version 22 * 2 of the License, or (at your option) any later version. 23 * 24 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com> 25 * Initial release. 26 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com> 27 * Added read() support + cleanups. 28 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com> 29 * Added 'device trimming' support. open(O_WRONLY) zeroes 30 * and frees the saved copy of applied microcode. 31 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com> 32 * Made to use devfs (/dev/cpu/microcode) + cleanups. 33 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com> 34 * Added misc device support (now uses both devfs and misc). 35 * Added MICROCODE_IOCFREE ioctl to clear memory. 36 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com> 37 * Messages for error cases (non Intel & no suitable microcode). 38 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com> 39 * Removed ->release(). Removed exclusive open and status bitmap. 40 * Added microcode_rwsem to serialize read()/write()/ioctl(). 41 * Removed global kernel lock usage. 42 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com> 43 * Write 0 to 0x8B msr and then cpuid before reading revision, 44 * so that it works even if there were no update done by the 45 * BIOS. Otherwise, reading from 0x8B gives junk (which happened 46 * to be 0 on my machine which is why it worked even when I 47 * disabled update by the BIOS) 48 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix. 49 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and 50 * Tigran Aivazian <tigran@veritas.com> 51 * Intel Pentium 4 processor support and bugfixes. 52 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com> 53 * Bugfix for HT (Hyper-Threading) enabled processors 54 * whereby processor resources are shared by all logical processors 55 * in a single CPU package. 56 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and 57 * Tigran Aivazian <tigran@veritas.com>, 58 * Serialize updates as required on HT processors due to 59 * speculative nature of implementation. 60 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com> 61 * Fix the panic when writing zero-length microcode chunk. 62 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>, 63 * Jun Nakajima <jun.nakajima@intel.com> 64 * Support for the microcode updates in the new format. 65 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com> 66 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl 67 * because we no longer hold a copy of applied microcode 68 * in kernel memory. 69 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com> 70 * Fix sigmatch() macro to handle old CPUs with pf == 0. 71 * Thanks to Stuart Swales for pointing out this bug. 72 */ 73 74 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 75 76 #include <linux/firmware.h> 77 #include <linux/uaccess.h> 78 #include <linux/kernel.h> 79 #include <linux/module.h> 80 #include <linux/vmalloc.h> 81 82 #include <asm/microcode_intel.h> 83 #include <asm/processor.h> 84 #include <asm/msr.h> 85 86 MODULE_DESCRIPTION("Microcode Update Driver"); 87 MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 88 MODULE_LICENSE("GPL"); 89 90 static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) 91 { 92 struct cpuinfo_x86 *c = &cpu_data(cpu_num); 93 unsigned int val[2]; 94 95 memset(csig, 0, sizeof(*csig)); 96 97 csig->sig = cpuid_eax(0x00000001); 98 99 if ((c->x86_model >= 5) || (c->x86 > 6)) { 100 /* get processor flags from MSR 0x17 */ 101 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); 102 csig->pf = 1 << ((val[1] >> 18) & 7); 103 } 104 105 csig->rev = c->microcode; 106 pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n", 107 cpu_num, csig->sig, csig->pf, csig->rev); 108 109 return 0; 110 } 111 112 /* 113 * return 0 - no update found 114 * return 1 - found update 115 */ 116 static int get_matching_mc(struct microcode_intel *mc_intel, int cpu) 117 { 118 struct cpu_signature cpu_sig; 119 unsigned int csig, cpf, crev; 120 121 collect_cpu_info(cpu, &cpu_sig); 122 123 csig = cpu_sig.sig; 124 cpf = cpu_sig.pf; 125 crev = cpu_sig.rev; 126 127 return get_matching_microcode(csig, cpf, mc_intel, crev); 128 } 129 130 static int apply_microcode_intel(int cpu) 131 { 132 struct microcode_intel *mc_intel; 133 struct ucode_cpu_info *uci; 134 unsigned int val[2]; 135 int cpu_num = raw_smp_processor_id(); 136 struct cpuinfo_x86 *c = &cpu_data(cpu_num); 137 138 uci = ucode_cpu_info + cpu; 139 mc_intel = uci->mc; 140 141 /* We should bind the task to the CPU */ 142 BUG_ON(cpu_num != cpu); 143 144 if (mc_intel == NULL) 145 return 0; 146 147 /* 148 * Microcode on this CPU could be updated earlier. Only apply the 149 * microcode patch in mc_intel when it is newer than the one on this 150 * CPU. 151 */ 152 if (get_matching_mc(mc_intel, cpu) == 0) 153 return 0; 154 155 /* write microcode via MSR 0x79 */ 156 wrmsr(MSR_IA32_UCODE_WRITE, 157 (unsigned long) mc_intel->bits, 158 (unsigned long) mc_intel->bits >> 16 >> 16); 159 wrmsr(MSR_IA32_UCODE_REV, 0, 0); 160 161 /* As documented in the SDM: Do a CPUID 1 here */ 162 sync_core(); 163 164 /* get the current revision from MSR 0x8B */ 165 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); 166 167 if (val[1] != mc_intel->hdr.rev) { 168 pr_err("CPU%d update to revision 0x%x failed\n", 169 cpu_num, mc_intel->hdr.rev); 170 return -1; 171 } 172 pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n", 173 cpu_num, val[1], 174 mc_intel->hdr.date & 0xffff, 175 mc_intel->hdr.date >> 24, 176 (mc_intel->hdr.date >> 16) & 0xff); 177 178 uci->cpu_sig.rev = val[1]; 179 c->microcode = val[1]; 180 181 return 0; 182 } 183 184 static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size, 185 int (*get_ucode_data)(void *, const void *, size_t)) 186 { 187 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 188 u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL; 189 int new_rev = uci->cpu_sig.rev; 190 unsigned int leftover = size; 191 enum ucode_state state = UCODE_OK; 192 unsigned int curr_mc_size = 0; 193 unsigned int csig, cpf; 194 195 while (leftover) { 196 struct microcode_header_intel mc_header; 197 unsigned int mc_size; 198 199 if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header))) 200 break; 201 202 mc_size = get_totalsize(&mc_header); 203 if (!mc_size || mc_size > leftover) { 204 pr_err("error! Bad data in microcode data file\n"); 205 break; 206 } 207 208 /* For performance reasons, reuse mc area when possible */ 209 if (!mc || mc_size > curr_mc_size) { 210 vfree(mc); 211 mc = vmalloc(mc_size); 212 if (!mc) 213 break; 214 curr_mc_size = mc_size; 215 } 216 217 if (get_ucode_data(mc, ucode_ptr, mc_size) || 218 microcode_sanity_check(mc, 1) < 0) { 219 break; 220 } 221 222 csig = uci->cpu_sig.sig; 223 cpf = uci->cpu_sig.pf; 224 if (get_matching_microcode(csig, cpf, mc, new_rev)) { 225 vfree(new_mc); 226 new_rev = mc_header.rev; 227 new_mc = mc; 228 mc = NULL; /* trigger new vmalloc */ 229 } 230 231 ucode_ptr += mc_size; 232 leftover -= mc_size; 233 } 234 235 vfree(mc); 236 237 if (leftover) { 238 vfree(new_mc); 239 state = UCODE_ERROR; 240 goto out; 241 } 242 243 if (!new_mc) { 244 state = UCODE_NFOUND; 245 goto out; 246 } 247 248 vfree(uci->mc); 249 uci->mc = (struct microcode_intel *)new_mc; 250 251 /* 252 * If early loading microcode is supported, save this mc into 253 * permanent memory. So it will be loaded early when a CPU is hot added 254 * or resumes. 255 */ 256 save_mc_for_early(new_mc); 257 258 pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n", 259 cpu, new_rev, uci->cpu_sig.rev); 260 out: 261 return state; 262 } 263 264 static int get_ucode_fw(void *to, const void *from, size_t n) 265 { 266 memcpy(to, from, n); 267 return 0; 268 } 269 270 static enum ucode_state request_microcode_fw(int cpu, struct device *device, 271 bool refresh_fw) 272 { 273 char name[30]; 274 struct cpuinfo_x86 *c = &cpu_data(cpu); 275 const struct firmware *firmware; 276 enum ucode_state ret; 277 278 sprintf(name, "intel-ucode/%02x-%02x-%02x", 279 c->x86, c->x86_model, c->x86_mask); 280 281 if (request_firmware_direct(&firmware, name, device)) { 282 pr_debug("data file %s load failed\n", name); 283 return UCODE_NFOUND; 284 } 285 286 ret = generic_load_microcode(cpu, (void *)firmware->data, 287 firmware->size, &get_ucode_fw); 288 289 release_firmware(firmware); 290 291 return ret; 292 } 293 294 static int get_ucode_user(void *to, const void *from, size_t n) 295 { 296 return copy_from_user(to, from, n); 297 } 298 299 static enum ucode_state 300 request_microcode_user(int cpu, const void __user *buf, size_t size) 301 { 302 return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user); 303 } 304 305 static void microcode_fini_cpu(int cpu) 306 { 307 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 308 309 vfree(uci->mc); 310 uci->mc = NULL; 311 } 312 313 static struct microcode_ops microcode_intel_ops = { 314 .request_microcode_user = request_microcode_user, 315 .request_microcode_fw = request_microcode_fw, 316 .collect_cpu_info = collect_cpu_info, 317 .apply_microcode = apply_microcode_intel, 318 .microcode_fini_cpu = microcode_fini_cpu, 319 }; 320 321 struct microcode_ops * __init init_intel_microcode(void) 322 { 323 struct cpuinfo_x86 *c = &cpu_data(0); 324 325 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || 326 cpu_has(c, X86_FEATURE_IA64)) { 327 pr_err("Intel CPU family 0x%x not supported\n", c->x86); 328 return NULL; 329 } 330 331 return µcode_intel_ops; 332 } 333 334