1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
513 lines
16 KiB
C
513 lines
16 KiB
C
/*
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* Intel CPU Microcode Update Driver for Linux
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*
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* Copyright (C) 2000-2004 Tigran Aivazian
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*
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* This driver allows to upgrade microcode on Intel processors
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* belonging to IA-32 family - PentiumPro, Pentium II,
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* Pentium III, Xeon, Pentium 4, etc.
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*
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* Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual,
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* Order Number 245472 or free download from:
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*
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* http://developer.intel.com/design/pentium4/manuals/245472.htm
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*
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* For more information, go to http://www.urbanmyth.org/microcode
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
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* Initial release.
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* 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
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* Added read() support + cleanups.
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* 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
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* Added 'device trimming' support. open(O_WRONLY) zeroes
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* and frees the saved copy of applied microcode.
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* 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
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* Made to use devfs (/dev/cpu/microcode) + cleanups.
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* 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
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* Added misc device support (now uses both devfs and misc).
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* Added MICROCODE_IOCFREE ioctl to clear memory.
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* 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
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* Messages for error cases (non Intel & no suitable microcode).
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* 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
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* Removed ->release(). Removed exclusive open and status bitmap.
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* Added microcode_rwsem to serialize read()/write()/ioctl().
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* Removed global kernel lock usage.
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* 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
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* Write 0 to 0x8B msr and then cpuid before reading revision,
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* so that it works even if there were no update done by the
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* BIOS. Otherwise, reading from 0x8B gives junk (which happened
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* to be 0 on my machine which is why it worked even when I
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* disabled update by the BIOS)
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* Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
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* 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
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* Tigran Aivazian <tigran@veritas.com>
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* Intel Pentium 4 processor support and bugfixes.
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* 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
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* Bugfix for HT (Hyper-Threading) enabled processors
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* whereby processor resources are shared by all logical processors
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* in a single CPU package.
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* 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
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* Tigran Aivazian <tigran@veritas.com>,
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* Serialize updates as required on HT processors due to speculative
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* nature of implementation.
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* 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
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* Fix the panic when writing zero-length microcode chunk.
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* 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
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* Jun Nakajima <jun.nakajima@intel.com>
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* Support for the microcode updates in the new format.
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* 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
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* Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
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* because we no longer hold a copy of applied microcode
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* in kernel memory.
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* 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
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* Fix sigmatch() macro to handle old CPUs with pf == 0.
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* Thanks to Stuart Swales for pointing out this bug.
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*/
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//#define DEBUG /* pr_debug */
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/miscdevice.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <asm/msr.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
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MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
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MODULE_LICENSE("GPL");
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#define MICROCODE_VERSION "1.14"
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#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
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#define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
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#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
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#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
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#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
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#define DWSIZE (sizeof (u32))
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#define get_totalsize(mc) \
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(((microcode_t *)mc)->hdr.totalsize ? \
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((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
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#define get_datasize(mc) \
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(((microcode_t *)mc)->hdr.datasize ? \
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((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
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#define sigmatch(s1, s2, p1, p2) \
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(((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
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#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
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/* serialize access to the physical write to MSR 0x79 */
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static DEFINE_SPINLOCK(microcode_update_lock);
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/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
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static DECLARE_MUTEX(microcode_sem);
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static void __user *user_buffer; /* user area microcode data buffer */
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static unsigned int user_buffer_size; /* it's size */
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typedef enum mc_error_code {
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MC_SUCCESS = 0,
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MC_NOTFOUND = 1,
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MC_MARKED = 2,
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MC_ALLOCATED = 3,
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} mc_error_code_t;
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static struct ucode_cpu_info {
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unsigned int sig;
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unsigned int pf;
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unsigned int rev;
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unsigned int cksum;
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mc_error_code_t err;
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microcode_t *mc;
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} ucode_cpu_info[NR_CPUS];
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static int microcode_open (struct inode *unused1, struct file *unused2)
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{
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return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
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}
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static void collect_cpu_info (void *unused)
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{
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int cpu_num = smp_processor_id();
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struct cpuinfo_x86 *c = cpu_data + cpu_num;
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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unsigned int val[2];
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uci->sig = uci->pf = uci->rev = uci->cksum = 0;
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uci->err = MC_NOTFOUND;
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uci->mc = NULL;
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if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
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cpu_has(c, X86_FEATURE_IA64)) {
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printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
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return;
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} else {
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uci->sig = cpuid_eax(0x00000001);
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if ((c->x86_model >= 5) || (c->x86 > 6)) {
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/* get processor flags from MSR 0x17 */
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rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
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uci->pf = 1 << ((val[1] >> 18) & 7);
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}
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}
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wrmsr(MSR_IA32_UCODE_REV, 0, 0);
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__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
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/* get the current revision from MSR 0x8B */
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rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
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pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
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uci->sig, uci->pf, uci->rev);
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}
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static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_header, int sig, int pf, int cksum)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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pr_debug("Microcode Found.\n");
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pr_debug(" Header Revision 0x%x\n", mc_header->hdrver);
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pr_debug(" Loader Revision 0x%x\n", mc_header->ldrver);
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pr_debug(" Revision 0x%x \n", mc_header->rev);
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pr_debug(" Date %x/%x/%x\n",
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((mc_header->date >> 24 ) & 0xff),
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((mc_header->date >> 16 ) & 0xff),
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(mc_header->date & 0xFFFF));
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pr_debug(" Signature 0x%x\n", sig);
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pr_debug(" Type 0x%x Family 0x%x Model 0x%x Stepping 0x%x\n",
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((sig >> 12) & 0x3),
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((sig >> 8) & 0xf),
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((sig >> 4) & 0xf),
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((sig & 0xf)));
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pr_debug(" Processor Flags 0x%x\n", pf);
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pr_debug(" Checksum 0x%x\n", cksum);
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if (mc_header->rev < uci->rev) {
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printk(KERN_ERR "microcode: CPU%d not 'upgrading' to earlier revision"
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" 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
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goto out;
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} else if (mc_header->rev == uci->rev) {
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/* notify the caller of success on this cpu */
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uci->err = MC_SUCCESS;
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printk(KERN_ERR "microcode: CPU%d already at revision"
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" 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
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goto out;
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}
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pr_debug("microcode: CPU%d found a matching microcode update with "
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" revision 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
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uci->cksum = cksum;
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uci->pf = pf; /* keep the original mc pf for cksum calculation */
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uci->err = MC_MARKED; /* found the match */
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out:
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return;
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}
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static int find_matching_ucodes (void)
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{
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int cursor = 0;
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int error = 0;
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while (cursor + MC_HEADER_SIZE < user_buffer_size) {
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microcode_header_t mc_header;
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void *newmc = NULL;
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int i, sum, cpu_num, allocated_flag, total_size, data_size, ext_table_size;
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if (copy_from_user(&mc_header, user_buffer + cursor, MC_HEADER_SIZE)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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error = -EFAULT;
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goto out;
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}
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total_size = get_totalsize(&mc_header);
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if ((cursor + total_size > user_buffer_size) || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
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printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
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error = -EINVAL;
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goto out;
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}
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data_size = get_datasize(&mc_header);
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if ((data_size + MC_HEADER_SIZE > total_size) || (data_size < DEFAULT_UCODE_DATASIZE)) {
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printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
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error = -EINVAL;
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goto out;
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}
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if (mc_header.ldrver != 1 || mc_header.hdrver != 1) {
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printk(KERN_ERR "microcode: error! Unknown microcode update format\n");
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error = -EINVAL;
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goto out;
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}
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for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
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continue;
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if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
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mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
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}
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ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
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if (ext_table_size) {
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struct extended_sigtable ext_header;
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struct extended_signature ext_sig;
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int ext_sigcount;
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if ((ext_table_size < EXT_HEADER_SIZE)
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|| ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
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printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
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error = -EINVAL;
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goto out;
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}
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if (copy_from_user(&ext_header, user_buffer + cursor
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+ MC_HEADER_SIZE + data_size, EXT_HEADER_SIZE)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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error = -EFAULT;
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goto out;
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}
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if (ext_table_size != exttable_size(&ext_header)) {
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printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
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error = -EFAULT;
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goto out;
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}
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ext_sigcount = ext_header.count;
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for (i = 0; i < ext_sigcount; i++) {
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if (copy_from_user(&ext_sig, user_buffer + cursor + MC_HEADER_SIZE + data_size + EXT_HEADER_SIZE
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+ EXT_SIGNATURE_SIZE * i, EXT_SIGNATURE_SIZE)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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error = -EFAULT;
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goto out;
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}
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for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
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continue;
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if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->pf)) {
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mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
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}
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}
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}
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}
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/* now check if any cpu has matched */
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for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
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if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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if (!allocated_flag) {
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allocated_flag = 1;
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newmc = vmalloc(total_size);
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if (!newmc) {
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printk(KERN_ERR "microcode: error! Can not allocate memory\n");
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error = -ENOMEM;
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goto out;
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}
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if (copy_from_user(newmc + MC_HEADER_SIZE,
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user_buffer + cursor + MC_HEADER_SIZE,
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total_size - MC_HEADER_SIZE)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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vfree(newmc);
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error = -EFAULT;
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goto out;
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}
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memcpy(newmc, &mc_header, MC_HEADER_SIZE);
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/* check extended table checksum */
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if (ext_table_size) {
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int ext_table_sum = 0;
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int * ext_tablep = (((void *) newmc) + MC_HEADER_SIZE + data_size);
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i = ext_table_size / DWSIZE;
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while (i--) ext_table_sum += ext_tablep[i];
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if (ext_table_sum) {
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printk(KERN_WARNING "microcode: aborting, bad extended signature table checksum\n");
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vfree(newmc);
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error = -EINVAL;
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goto out;
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}
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}
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/* calculate the checksum */
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i = (MC_HEADER_SIZE + data_size) / DWSIZE;
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while (i--) sum += ((int *)newmc)[i];
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sum -= (mc_header.sig + mc_header.pf + mc_header.cksum);
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}
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ucode_cpu_info[cpu_num].mc = newmc;
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ucode_cpu_info[cpu_num].err = MC_ALLOCATED; /* mc updated */
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if (sum + uci->sig + uci->pf + uci->cksum != 0) {
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printk(KERN_ERR "microcode: CPU%d aborting, bad checksum\n", cpu_num);
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error = -EINVAL;
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goto out;
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}
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}
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}
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cursor += total_size; /* goto the next update patch */
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} /* end of while */
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out:
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return error;
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}
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static void do_update_one (void * unused)
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{
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unsigned long flags;
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unsigned int val[2];
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int cpu_num = smp_processor_id();
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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if (uci->mc == NULL) {
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printk(KERN_INFO "microcode: No new microcode data for CPU%d\n", cpu_num);
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return;
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}
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/* serialize access to the physical write to MSR 0x79 */
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spin_lock_irqsave(µcode_update_lock, flags);
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/* write microcode via MSR 0x79 */
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wrmsr(MSR_IA32_UCODE_WRITE,
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(unsigned long) uci->mc->bits,
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(unsigned long) uci->mc->bits >> 16 >> 16);
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wrmsr(MSR_IA32_UCODE_REV, 0, 0);
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__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
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/* get the current revision from MSR 0x8B */
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rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
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/* notify the caller of success on this cpu */
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uci->err = MC_SUCCESS;
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spin_unlock_irqrestore(µcode_update_lock, flags);
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printk(KERN_INFO "microcode: CPU%d updated from revision "
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"0x%x to 0x%x, date = %08x \n",
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cpu_num, uci->rev, val[1], uci->mc->hdr.date);
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return;
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}
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static int do_microcode_update (void)
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{
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int i, error;
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if (on_each_cpu(collect_cpu_info, NULL, 1, 1) != 0) {
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printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
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error = -EIO;
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goto out;
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}
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if ((error = find_matching_ucodes())) {
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printk(KERN_ERR "microcode: Error in the microcode data\n");
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goto out_free;
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}
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if (on_each_cpu(do_update_one, NULL, 1, 1) != 0) {
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printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
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error = -EIO;
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}
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out_free:
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for (i = 0; i < num_online_cpus(); i++) {
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if (ucode_cpu_info[i].mc) {
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int j;
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void *tmp = ucode_cpu_info[i].mc;
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vfree(tmp);
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for (j = i; j < num_online_cpus(); j++) {
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if (ucode_cpu_info[j].mc == tmp)
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ucode_cpu_info[j].mc = NULL;
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|
}
|
|
}
|
|
}
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (len < DEFAULT_UCODE_TOTALSIZE) {
|
|
printk(KERN_ERR "microcode: not enough data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((len >> PAGE_SHIFT) > num_physpages) {
|
|
printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
|
|
return -EINVAL;
|
|
}
|
|
|
|
down(µcode_sem);
|
|
|
|
user_buffer = (void __user *) buf;
|
|
user_buffer_size = (int) len;
|
|
|
|
ret = do_microcode_update();
|
|
if (!ret)
|
|
ret = (ssize_t)len;
|
|
|
|
up(µcode_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int microcode_ioctl (struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
/*
|
|
* XXX: will be removed after microcode_ctl
|
|
* is updated to ignore failure of this ioctl()
|
|
*/
|
|
case MICROCODE_IOCFREE:
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct file_operations microcode_fops = {
|
|
.owner = THIS_MODULE,
|
|
.write = microcode_write,
|
|
.ioctl = microcode_ioctl,
|
|
.open = microcode_open,
|
|
};
|
|
|
|
static struct miscdevice microcode_dev = {
|
|
.minor = MICROCODE_MINOR,
|
|
.name = "microcode",
|
|
.devfs_name = "cpu/microcode",
|
|
.fops = µcode_fops,
|
|
};
|
|
|
|
static int __init microcode_init (void)
|
|
{
|
|
int error;
|
|
|
|
error = misc_register(µcode_dev);
|
|
if (error) {
|
|
printk(KERN_ERR
|
|
"microcode: can't misc_register on minor=%d\n",
|
|
MICROCODE_MINOR);
|
|
return error;
|
|
}
|
|
|
|
printk(KERN_INFO
|
|
"IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@veritas.com>\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit microcode_exit (void)
|
|
{
|
|
misc_deregister(µcode_dev);
|
|
printk(KERN_INFO "IA-32 Microcode Update Driver v" MICROCODE_VERSION " unregistered\n");
|
|
}
|
|
|
|
module_init(microcode_init)
|
|
module_exit(microcode_exit)
|
|
MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
|