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![Thomas Gleixner](/assets/img/avatar_default.png)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
850 lines
22 KiB
C
850 lines
22 KiB
C
/*
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* Intel CPU Microcode Update Driver for Linux
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*
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* Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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* 2006 Shaohua Li <shaohua.li@intel.com>
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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/capability.h>
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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/cpumask.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 <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/cpu.h>
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#include <linux/firmware.h>
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#include <linux/platform_device.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@aivazian.fsnet.co.uk>");
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MODULE_LICENSE("GPL");
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#define MICROCODE_VERSION "1.14a"
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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 DEFINE_MUTEX(microcode_mutex);
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static struct ucode_cpu_info {
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int valid;
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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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microcode_t *mc;
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} ucode_cpu_info[NR_CPUS];
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static void collect_cpu_info(int cpu_num)
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{
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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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/* We should bind the task to the CPU */
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BUG_ON(raw_smp_processor_id() != cpu_num);
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uci->pf = uci->rev = 0;
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uci->mc = NULL;
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uci->valid = 1;
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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 "
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"processor\n", cpu_num);
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uci->valid = 0;
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return;
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}
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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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wrmsr(MSR_IA32_UCODE_REV, 0, 0);
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/* see notes above for revision 1.07. Apparent chip bug */
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sync_core();
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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 int microcode_update_match(int cpu_num,
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microcode_header_t *mc_header, int sig, int pf)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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if (!sigmatch(sig, uci->sig, pf, uci->pf)
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|| mc_header->rev <= uci->rev)
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return 0;
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return 1;
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}
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static int microcode_sanity_check(void *mc)
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{
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microcode_header_t *mc_header = mc;
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struct extended_sigtable *ext_header = NULL;
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struct extended_signature *ext_sig;
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unsigned long total_size, data_size, ext_table_size;
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int sum, orig_sum, ext_sigcount = 0, i;
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total_size = get_totalsize(mc_header);
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data_size = get_datasize(mc_header);
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if (data_size + MC_HEADER_SIZE > total_size) {
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printk(KERN_ERR "microcode: error! "
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"Bad data size in microcode data file\n");
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return -EINVAL;
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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! "
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"Unknown microcode update format\n");
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return -EINVAL;
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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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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! "
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"Small exttable size in microcode data file\n");
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return -EINVAL;
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}
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ext_header = mc + MC_HEADER_SIZE + data_size;
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if (ext_table_size != exttable_size(ext_header)) {
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printk(KERN_ERR "microcode: error! "
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"Bad exttable size in microcode data file\n");
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return -EFAULT;
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}
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ext_sigcount = ext_header->count;
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}
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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 = (int *)ext_header;
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i = ext_table_size / DWSIZE;
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while (i--)
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ext_table_sum += ext_tablep[i];
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if (ext_table_sum) {
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printk(KERN_WARNING "microcode: aborting, "
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"bad extended signature table checksum\n");
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return -EINVAL;
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}
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}
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/* calculate the checksum */
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orig_sum = 0;
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i = (MC_HEADER_SIZE + data_size) / DWSIZE;
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while (i--)
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orig_sum += ((int *)mc)[i];
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if (orig_sum) {
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printk(KERN_ERR "microcode: aborting, bad checksum\n");
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return -EINVAL;
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}
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if (!ext_table_size)
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return 0;
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/* check extended signature checksum */
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for (i = 0; i < ext_sigcount; i++) {
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ext_sig = (struct extended_signature *)((void *)ext_header
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+ EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i);
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sum = orig_sum
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- (mc_header->sig + mc_header->pf + mc_header->cksum)
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+ (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
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if (sum) {
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printk(KERN_ERR "microcode: aborting, bad checksum\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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/*
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* return 0 - no update found
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* return 1 - found update
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* return < 0 - error
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*/
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static int get_maching_microcode(void *mc, int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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microcode_header_t *mc_header = mc;
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struct extended_sigtable *ext_header;
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unsigned long total_size = get_totalsize(mc_header);
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int ext_sigcount, i;
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struct extended_signature *ext_sig;
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void *new_mc;
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if (microcode_update_match(cpu, mc_header,
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mc_header->sig, mc_header->pf))
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goto find;
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if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
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return 0;
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ext_header = (struct extended_sigtable *)(mc +
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get_datasize(mc_header) + MC_HEADER_SIZE);
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ext_sigcount = ext_header->count;
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ext_sig = (struct extended_signature *)((void *)ext_header
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+ EXT_HEADER_SIZE);
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for (i = 0; i < ext_sigcount; i++) {
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if (microcode_update_match(cpu, mc_header,
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ext_sig->sig, ext_sig->pf))
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goto find;
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ext_sig++;
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}
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return 0;
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find:
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pr_debug("microcode: CPU %d found a matching microcode update with"
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" version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
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new_mc = vmalloc(total_size);
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if (!new_mc) {
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printk(KERN_ERR "microcode: error! Can not allocate memory\n");
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return -ENOMEM;
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}
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/* free previous update file */
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vfree(uci->mc);
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memcpy(new_mc, mc, total_size);
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uci->mc = new_mc;
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return 1;
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}
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static void apply_microcode(int cpu)
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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 = raw_smp_processor_id();
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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/* We should bind the task to the CPU */
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BUG_ON(cpu_num != cpu);
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if (uci->mc == NULL)
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return;
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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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/* see notes above for revision 1.07. Apparent chip bug */
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sync_core();
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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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spin_unlock_irqrestore(µcode_update_lock, flags);
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if (val[1] != uci->mc->hdr.rev) {
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printk(KERN_ERR "microcode: CPU%d updated from revision "
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"0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
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return;
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}
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pr_debug("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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uci->rev = val[1];
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}
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#ifdef CONFIG_MICROCODE_OLD_INTERFACE
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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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static long get_next_ucode(void **mc, long offset)
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{
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microcode_header_t mc_header;
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unsigned long total_size;
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/* No more data */
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if (offset >= user_buffer_size)
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return 0;
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if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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return -EFAULT;
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}
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total_size = get_totalsize(&mc_header);
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if (offset + total_size > user_buffer_size) {
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printk(KERN_ERR "microcode: error! Bad total size in microcode "
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"data file\n");
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return -EINVAL;
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}
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*mc = vmalloc(total_size);
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if (!*mc)
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return -ENOMEM;
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if (copy_from_user(*mc, user_buffer + offset, total_size)) {
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printk(KERN_ERR "microcode: error! Can not read user data\n");
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vfree(*mc);
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return -EFAULT;
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}
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return offset + total_size;
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}
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static int do_microcode_update (void)
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{
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long cursor = 0;
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int error = 0;
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void *new_mc = NULL;
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int cpu;
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cpumask_t old;
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old = current->cpus_allowed;
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while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) {
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error = microcode_sanity_check(new_mc);
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if (error)
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goto out;
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/*
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* It's possible the data file has multiple matching ucode,
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* lets keep searching till the latest version
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*/
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for_each_online_cpu(cpu) {
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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if (!uci->valid)
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continue;
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set_cpus_allowed(current, cpumask_of_cpu(cpu));
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error = get_maching_microcode(new_mc, cpu);
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if (error < 0)
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goto out;
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if (error == 1)
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apply_microcode(cpu);
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}
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vfree(new_mc);
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}
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out:
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if (cursor > 0)
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vfree(new_mc);
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if (cursor < 0)
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error = cursor;
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set_cpus_allowed(current, old);
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return error;
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}
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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 ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
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{
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ssize_t ret;
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if ((len >> PAGE_SHIFT) > num_physpages) {
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printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
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return -EINVAL;
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}
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lock_cpu_hotplug();
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mutex_lock(µcode_mutex);
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user_buffer = (void __user *) buf;
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user_buffer_size = (int) len;
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ret = do_microcode_update();
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if (!ret)
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ret = (ssize_t)len;
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mutex_unlock(µcode_mutex);
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unlock_cpu_hotplug();
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return ret;
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}
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static const struct file_operations microcode_fops = {
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.owner = THIS_MODULE,
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.write = microcode_write,
|
|
.open = microcode_open,
|
|
};
|
|
|
|
static struct miscdevice microcode_dev = {
|
|
.minor = MICROCODE_MINOR,
|
|
.name = "microcode",
|
|
.fops = µcode_fops,
|
|
};
|
|
|
|
static int __init microcode_dev_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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void microcode_dev_exit (void)
|
|
{
|
|
misc_deregister(µcode_dev);
|
|
}
|
|
|
|
MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
|
|
#else
|
|
#define microcode_dev_init() 0
|
|
#define microcode_dev_exit() do { } while(0)
|
|
#endif
|
|
|
|
static long get_next_ucode_from_buffer(void **mc, void *buf,
|
|
unsigned long size, long offset)
|
|
{
|
|
microcode_header_t *mc_header;
|
|
unsigned long total_size;
|
|
|
|
/* No more data */
|
|
if (offset >= size)
|
|
return 0;
|
|
mc_header = (microcode_header_t *)(buf + offset);
|
|
total_size = get_totalsize(mc_header);
|
|
|
|
if (offset + total_size > size) {
|
|
printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
*mc = vmalloc(total_size);
|
|
if (!*mc) {
|
|
printk(KERN_ERR "microcode: error! Can not allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
memcpy(*mc, buf + offset, total_size);
|
|
return offset + total_size;
|
|
}
|
|
|
|
/* fake device for request_firmware */
|
|
static struct platform_device *microcode_pdev;
|
|
|
|
static int cpu_request_microcode(int cpu)
|
|
{
|
|
char name[30];
|
|
struct cpuinfo_x86 *c = cpu_data + cpu;
|
|
const struct firmware *firmware;
|
|
void *buf;
|
|
unsigned long size;
|
|
long offset = 0;
|
|
int error;
|
|
void *mc;
|
|
|
|
/* We should bind the task to the CPU */
|
|
BUG_ON(cpu != raw_smp_processor_id());
|
|
sprintf(name,"intel-ucode/%02x-%02x-%02x",
|
|
c->x86, c->x86_model, c->x86_mask);
|
|
error = request_firmware(&firmware, name, µcode_pdev->dev);
|
|
if (error) {
|
|
pr_debug("ucode data file %s load failed\n", name);
|
|
return error;
|
|
}
|
|
buf = (void *)firmware->data;
|
|
size = firmware->size;
|
|
while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
|
|
> 0) {
|
|
error = microcode_sanity_check(mc);
|
|
if (error)
|
|
break;
|
|
error = get_maching_microcode(mc, cpu);
|
|
if (error < 0)
|
|
break;
|
|
/*
|
|
* It's possible the data file has multiple matching ucode,
|
|
* lets keep searching till the latest version
|
|
*/
|
|
if (error == 1) {
|
|
apply_microcode(cpu);
|
|
error = 0;
|
|
}
|
|
vfree(mc);
|
|
}
|
|
if (offset > 0)
|
|
vfree(mc);
|
|
if (offset < 0)
|
|
error = offset;
|
|
release_firmware(firmware);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int apply_microcode_check_cpu(int cpu)
|
|
{
|
|
struct cpuinfo_x86 *c = cpu_data + cpu;
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
|
cpumask_t old;
|
|
unsigned int val[2];
|
|
int err = 0;
|
|
|
|
/* Check if the microcode is available */
|
|
if (!uci->mc)
|
|
return 0;
|
|
|
|
old = current->cpus_allowed;
|
|
set_cpus_allowed(current, cpumask_of_cpu(cpu));
|
|
|
|
/* Check if the microcode we have in memory matches the CPU */
|
|
if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
|
|
cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001))
|
|
err = -EINVAL;
|
|
|
|
if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) {
|
|
/* get processor flags from MSR 0x17 */
|
|
rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
|
|
if (uci->pf != (1 << ((val[1] >> 18) & 7)))
|
|
err = -EINVAL;
|
|
}
|
|
|
|
if (!err) {
|
|
wrmsr(MSR_IA32_UCODE_REV, 0, 0);
|
|
/* see notes above for revision 1.07. Apparent chip bug */
|
|
sync_core();
|
|
/* get the current revision from MSR 0x8B */
|
|
rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
|
|
if (uci->rev != val[1])
|
|
err = -EINVAL;
|
|
}
|
|
|
|
if (!err)
|
|
apply_microcode(cpu);
|
|
else
|
|
printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:"
|
|
" sig=0x%x, pf=0x%x, rev=0x%x\n",
|
|
cpu, uci->sig, uci->pf, uci->rev);
|
|
|
|
set_cpus_allowed(current, old);
|
|
return err;
|
|
}
|
|
|
|
static void microcode_init_cpu(int cpu, int resume)
|
|
{
|
|
cpumask_t old;
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
|
|
|
old = current->cpus_allowed;
|
|
|
|
set_cpus_allowed(current, cpumask_of_cpu(cpu));
|
|
mutex_lock(µcode_mutex);
|
|
collect_cpu_info(cpu);
|
|
if (uci->valid && system_state == SYSTEM_RUNNING && !resume)
|
|
cpu_request_microcode(cpu);
|
|
mutex_unlock(µcode_mutex);
|
|
set_cpus_allowed(current, old);
|
|
}
|
|
|
|
static void microcode_fini_cpu(int cpu)
|
|
{
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
|
|
|
mutex_lock(µcode_mutex);
|
|
uci->valid = 0;
|
|
vfree(uci->mc);
|
|
uci->mc = NULL;
|
|
mutex_unlock(µcode_mutex);
|
|
}
|
|
|
|
static ssize_t reload_store(struct sys_device *dev, const char *buf, size_t sz)
|
|
{
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
|
|
char *end;
|
|
unsigned long val = simple_strtoul(buf, &end, 0);
|
|
int err = 0;
|
|
int cpu = dev->id;
|
|
|
|
if (end == buf)
|
|
return -EINVAL;
|
|
if (val == 1) {
|
|
cpumask_t old;
|
|
|
|
old = current->cpus_allowed;
|
|
|
|
lock_cpu_hotplug();
|
|
set_cpus_allowed(current, cpumask_of_cpu(cpu));
|
|
|
|
mutex_lock(µcode_mutex);
|
|
if (uci->valid)
|
|
err = cpu_request_microcode(cpu);
|
|
mutex_unlock(µcode_mutex);
|
|
unlock_cpu_hotplug();
|
|
set_cpus_allowed(current, old);
|
|
}
|
|
if (err)
|
|
return err;
|
|
return sz;
|
|
}
|
|
|
|
static ssize_t version_show(struct sys_device *dev, char *buf)
|
|
{
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
|
|
|
|
return sprintf(buf, "0x%x\n", uci->rev);
|
|
}
|
|
|
|
static ssize_t pf_show(struct sys_device *dev, char *buf)
|
|
{
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
|
|
|
|
return sprintf(buf, "0x%x\n", uci->pf);
|
|
}
|
|
|
|
static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
|
|
static SYSDEV_ATTR(version, 0400, version_show, NULL);
|
|
static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
|
|
|
|
static struct attribute *mc_default_attrs[] = {
|
|
&attr_reload.attr,
|
|
&attr_version.attr,
|
|
&attr_processor_flags.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group mc_attr_group = {
|
|
.attrs = mc_default_attrs,
|
|
.name = "microcode",
|
|
};
|
|
|
|
static int __mc_sysdev_add(struct sys_device *sys_dev, int resume)
|
|
{
|
|
int err, cpu = sys_dev->id;
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
|
|
|
if (!cpu_online(cpu))
|
|
return 0;
|
|
|
|
pr_debug("Microcode:CPU %d added\n", cpu);
|
|
memset(uci, 0, sizeof(*uci));
|
|
|
|
err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
|
|
if (err)
|
|
return err;
|
|
|
|
microcode_init_cpu(cpu, resume);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mc_sysdev_add(struct sys_device *sys_dev)
|
|
{
|
|
return __mc_sysdev_add(sys_dev, 0);
|
|
}
|
|
|
|
static int mc_sysdev_remove(struct sys_device *sys_dev)
|
|
{
|
|
int cpu = sys_dev->id;
|
|
|
|
if (!cpu_online(cpu))
|
|
return 0;
|
|
|
|
pr_debug("Microcode:CPU %d removed\n", cpu);
|
|
microcode_fini_cpu(cpu);
|
|
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
|
|
return 0;
|
|
}
|
|
|
|
static int mc_sysdev_resume(struct sys_device *dev)
|
|
{
|
|
int cpu = dev->id;
|
|
|
|
if (!cpu_online(cpu))
|
|
return 0;
|
|
pr_debug("Microcode:CPU %d resumed\n", cpu);
|
|
/* only CPU 0 will apply ucode here */
|
|
apply_microcode(0);
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_driver mc_sysdev_driver = {
|
|
.add = mc_sysdev_add,
|
|
.remove = mc_sysdev_remove,
|
|
.resume = mc_sysdev_resume,
|
|
};
|
|
|
|
static __cpuinit int
|
|
mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
struct sys_device *sys_dev;
|
|
|
|
sys_dev = get_cpu_sysdev(cpu);
|
|
switch (action) {
|
|
case CPU_UP_CANCELED_FROZEN:
|
|
/* The CPU refused to come up during a system resume */
|
|
microcode_fini_cpu(cpu);
|
|
break;
|
|
case CPU_ONLINE:
|
|
case CPU_DOWN_FAILED:
|
|
mc_sysdev_add(sys_dev);
|
|
break;
|
|
case CPU_ONLINE_FROZEN:
|
|
/* System-wide resume is in progress, try to apply microcode */
|
|
if (apply_microcode_check_cpu(cpu)) {
|
|
/* The application of microcode failed */
|
|
microcode_fini_cpu(cpu);
|
|
__mc_sysdev_add(sys_dev, 1);
|
|
break;
|
|
}
|
|
case CPU_DOWN_FAILED_FROZEN:
|
|
if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
|
|
printk(KERN_ERR "Microcode: Failed to create the sysfs "
|
|
"group for CPU%d\n", cpu);
|
|
break;
|
|
case CPU_DOWN_PREPARE:
|
|
mc_sysdev_remove(sys_dev);
|
|
break;
|
|
case CPU_DOWN_PREPARE_FROZEN:
|
|
/* Suspend is in progress, only remove the interface */
|
|
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata mc_cpu_notifier = {
|
|
.notifier_call = mc_cpu_callback,
|
|
};
|
|
|
|
static int __init microcode_init (void)
|
|
{
|
|
int error;
|
|
|
|
error = microcode_dev_init();
|
|
if (error)
|
|
return error;
|
|
microcode_pdev = platform_device_register_simple("microcode", -1,
|
|
NULL, 0);
|
|
if (IS_ERR(microcode_pdev)) {
|
|
microcode_dev_exit();
|
|
return PTR_ERR(microcode_pdev);
|
|
}
|
|
|
|
lock_cpu_hotplug();
|
|
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
|
|
unlock_cpu_hotplug();
|
|
if (error) {
|
|
microcode_dev_exit();
|
|
platform_device_unregister(microcode_pdev);
|
|
return error;
|
|
}
|
|
|
|
register_hotcpu_notifier(&mc_cpu_notifier);
|
|
|
|
printk(KERN_INFO
|
|
"IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit microcode_exit (void)
|
|
{
|
|
microcode_dev_exit();
|
|
|
|
unregister_hotcpu_notifier(&mc_cpu_notifier);
|
|
|
|
lock_cpu_hotplug();
|
|
sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
|
|
unlock_cpu_hotplug();
|
|
|
|
platform_device_unregister(microcode_pdev);
|
|
}
|
|
|
|
module_init(microcode_init)
|
|
module_exit(microcode_exit)
|