diff options
Diffstat (limited to 'arch/x86/kernel/microcode_intel.c')
| -rw-r--r-- | arch/x86/kernel/microcode_intel.c | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c deleted file mode 100644 index 5fb2cebf556..00000000000 --- a/arch/x86/kernel/microcode_intel.c +++ /dev/null @@ -1,333 +0,0 @@ -/* - * Intel CPU Microcode Update Driver for Linux - * - * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> - * 2006 Shaohua Li <shaohua.li@intel.com> - * - * This driver allows to upgrade microcode on Intel processors - * belonging to IA-32 family - PentiumPro, Pentium II, - * Pentium III, Xeon, Pentium 4, etc. - * - * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture - * Software Developer's Manual - * Order Number 253668 or free download from: - * - * http://developer.intel.com/Assets/PDF/manual/253668.pdf - * - * For more information, go to http://www.urbanmyth.org/microcode - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com> - * Initial release. - * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com> - * Added read() support + cleanups. - * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com> - * Added 'device trimming' support. open(O_WRONLY) zeroes - * and frees the saved copy of applied microcode. - * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com> - * Made to use devfs (/dev/cpu/microcode) + cleanups. - * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com> - * Added misc device support (now uses both devfs and misc). - * Added MICROCODE_IOCFREE ioctl to clear memory. - * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com> - * Messages for error cases (non Intel & no suitable microcode). - * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com> - * Removed ->release(). Removed exclusive open and status bitmap. - * Added microcode_rwsem to serialize read()/write()/ioctl(). - * Removed global kernel lock usage. - * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com> - * Write 0 to 0x8B msr and then cpuid before reading revision, - * so that it works even if there were no update done by the - * BIOS. Otherwise, reading from 0x8B gives junk (which happened - * to be 0 on my machine which is why it worked even when I - * disabled update by the BIOS) - * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix. - * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and - * Tigran Aivazian <tigran@veritas.com> - * Intel Pentium 4 processor support and bugfixes. - * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com> - * Bugfix for HT (Hyper-Threading) enabled processors - * whereby processor resources are shared by all logical processors - * in a single CPU package. - * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and - * Tigran Aivazian <tigran@veritas.com>, - * Serialize updates as required on HT processors due to - * speculative nature of implementation. - * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com> - * Fix the panic when writing zero-length microcode chunk. - * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>, - * Jun Nakajima <jun.nakajima@intel.com> - * Support for the microcode updates in the new format. - * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com> - * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl - * because we no longer hold a copy of applied microcode - * in kernel memory. - * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com> - * Fix sigmatch() macro to handle old CPUs with pf == 0. - * Thanks to Stuart Swales for pointing out this bug. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/firmware.h> -#include <linux/uaccess.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/vmalloc.h> - -#include <asm/microcode_intel.h> -#include <asm/processor.h> -#include <asm/msr.h> - -MODULE_DESCRIPTION("Microcode Update Driver"); -MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); -MODULE_LICENSE("GPL"); - -static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) -{ - struct cpuinfo_x86 *c = &cpu_data(cpu_num); - unsigned int val[2]; - - memset(csig, 0, sizeof(*csig)); - - csig->sig = cpuid_eax(0x00000001); - - if ((c->x86_model >= 5) || (c->x86 > 6)) { - /* get processor flags from MSR 0x17 */ - rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); - csig->pf = 1 << ((val[1] >> 18) & 7); - } - - csig->rev = c->microcode; - pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n", - cpu_num, csig->sig, csig->pf, csig->rev); - - return 0; -} - -/* - * return 0 - no update found - * return 1 - found update - */ -static int get_matching_mc(struct microcode_intel *mc_intel, int cpu) -{ - struct cpu_signature cpu_sig; - unsigned int csig, cpf, crev; - - collect_cpu_info(cpu, &cpu_sig); - - csig = cpu_sig.sig; - cpf = cpu_sig.pf; - crev = cpu_sig.rev; - - return get_matching_microcode(csig, cpf, mc_intel, crev); -} - -int apply_microcode(int cpu) -{ - struct microcode_intel *mc_intel; - struct ucode_cpu_info *uci; - unsigned int val[2]; - int cpu_num = raw_smp_processor_id(); - struct cpuinfo_x86 *c = &cpu_data(cpu_num); - - uci = ucode_cpu_info + cpu; - mc_intel = uci->mc; - - /* We should bind the task to the CPU */ - BUG_ON(cpu_num != cpu); - - if (mc_intel == NULL) - return 0; - - /* - * Microcode on this CPU could be updated earlier. Only apply the - * microcode patch in mc_intel when it is newer than the one on this - * CPU. - */ - if (get_matching_mc(mc_intel, cpu) == 0) - return 0; - - /* write microcode via MSR 0x79 */ - wrmsr(MSR_IA32_UCODE_WRITE, - (unsigned long) mc_intel->bits, - (unsigned long) mc_intel->bits >> 16 >> 16); - wrmsr(MSR_IA32_UCODE_REV, 0, 0); - - /* As documented in the SDM: Do a CPUID 1 here */ - sync_core(); - - /* get the current revision from MSR 0x8B */ - rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); - - if (val[1] != mc_intel->hdr.rev) { - pr_err("CPU%d update to revision 0x%x failed\n", - cpu_num, mc_intel->hdr.rev); - return -1; - } - pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n", - cpu_num, val[1], - mc_intel->hdr.date & 0xffff, - mc_intel->hdr.date >> 24, - (mc_intel->hdr.date >> 16) & 0xff); - - uci->cpu_sig.rev = val[1]; - c->microcode = val[1]; - - return 0; -} - -static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size, - int (*get_ucode_data)(void *, const void *, size_t)) -{ - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL; - int new_rev = uci->cpu_sig.rev; - unsigned int leftover = size; - enum ucode_state state = UCODE_OK; - unsigned int curr_mc_size = 0; - unsigned int csig, cpf; - - while (leftover) { - struct microcode_header_intel mc_header; - unsigned int mc_size; - - if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header))) - break; - - mc_size = get_totalsize(&mc_header); - if (!mc_size || mc_size > leftover) { - pr_err("error! Bad data in microcode data file\n"); - break; - } - - /* For performance reasons, reuse mc area when possible */ - if (!mc || mc_size > curr_mc_size) { - vfree(mc); - mc = vmalloc(mc_size); - if (!mc) - break; - curr_mc_size = mc_size; - } - - if (get_ucode_data(mc, ucode_ptr, mc_size) || - microcode_sanity_check(mc, 1) < 0) { - break; - } - - csig = uci->cpu_sig.sig; - cpf = uci->cpu_sig.pf; - if (get_matching_microcode(csig, cpf, mc, new_rev)) { - vfree(new_mc); - new_rev = mc_header.rev; - new_mc = mc; - mc = NULL; /* trigger new vmalloc */ - } - - ucode_ptr += mc_size; - leftover -= mc_size; - } - - vfree(mc); - - if (leftover) { - vfree(new_mc); - state = UCODE_ERROR; - goto out; - } - - if (!new_mc) { - state = UCODE_NFOUND; - goto out; - } - - vfree(uci->mc); - uci->mc = (struct microcode_intel *)new_mc; - - /* - * If early loading microcode is supported, save this mc into - * permanent memory. So it will be loaded early when a CPU is hot added - * or resumes. - */ - save_mc_for_early(new_mc); - - pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n", - cpu, new_rev, uci->cpu_sig.rev); -out: - return state; -} - -static int get_ucode_fw(void *to, const void *from, size_t n) -{ - memcpy(to, from, n); - return 0; -} - -static enum ucode_state request_microcode_fw(int cpu, struct device *device, - bool refresh_fw) -{ - char name[30]; - struct cpuinfo_x86 *c = &cpu_data(cpu); - const struct firmware *firmware; - enum ucode_state ret; - - sprintf(name, "intel-ucode/%02x-%02x-%02x", - c->x86, c->x86_model, c->x86_mask); - - if (request_firmware(&firmware, name, device)) { - pr_debug("data file %s load failed\n", name); - return UCODE_NFOUND; - } - - ret = generic_load_microcode(cpu, (void *)firmware->data, - firmware->size, &get_ucode_fw); - - release_firmware(firmware); - - return ret; -} - -static int get_ucode_user(void *to, const void *from, size_t n) -{ - return copy_from_user(to, from, n); -} - -static enum ucode_state -request_microcode_user(int cpu, const void __user *buf, size_t size) -{ - return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user); -} - -static void microcode_fini_cpu(int cpu) -{ - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - - vfree(uci->mc); - uci->mc = NULL; -} - -static struct microcode_ops microcode_intel_ops = { - .request_microcode_user = request_microcode_user, - .request_microcode_fw = request_microcode_fw, - .collect_cpu_info = collect_cpu_info, - .apply_microcode = apply_microcode, - .microcode_fini_cpu = microcode_fini_cpu, -}; - -struct microcode_ops * __init init_intel_microcode(void) -{ - struct cpuinfo_x86 *c = &cpu_data(0); - - if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || - cpu_has(c, X86_FEATURE_IA64)) { - pr_err("Intel CPU family 0x%x not supported\n", c->x86); - return NULL; - } - - return µcode_intel_ops; -} - |