diff options
Diffstat (limited to 'arch/x86/kernel/cpu/microcode/intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/microcode/intel.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c new file mode 100644 index 000000000000..5fb2cebf556b --- /dev/null +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -0,0 +1,333 @@ +/* + * 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; +} + |