![Dmitry Adamushko](/assets/img/avatar_default.png)
* Solve issues described in 6f66cbc630
in a way that doesn't resort to set_cpus_allowed();
* in fact, only collect_cpu_info and apply_microcode callbacks
must run on a target cpu, others will do just fine on any other.
smp_call_function_single() (as suggested by Ingo) is used to run
these callbacks on a target cpu.
* cleanup of synchronization logic of the 'microcode_core' part
The generic 'microcode_core' part guarantees that only a single cpu
(be it a full-fledged cpu, one of the cores or HT)
is being updated at any particular moment of time.
In general, there is no need for any additional sync. mechanism in
arch-specific parts (the patch removes existing spinlocks).
See also the "Synchronization" section in microcode_core.c.
* return -EINVAL instead of -1 (which is translated into -EPERM) in
microcode_write(), reload_cpu() and mc_sysdev_add(). Other suggestions
for an error code?
* use 'enum ucode_state' as return value of request_microcode_{fw, user}
to gain more flexibility by distinguishing between real error cases
and situations when an appropriate ucode was not found (which is not an
error per-se).
* some minor cleanups
Thanks a lot to Hugh Dickins for review/suggestions/testing!
Reference: http://marc.info/?l=linux-kernel&m=124025889012541&w=2
[ Impact: refactor and clean up microcode driver locking code ]
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Peter Oruba <peter.oruba@amd.com>
Cc: Arjan van de Ven <arjan@infradead.org>
LKML-Reference: <1242078507.5560.9.camel@earth>
[ did some more cleanups ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/include/asm/microcode.h | 25 ++
arch/x86/kernel/microcode_amd.c | 58 ++----
arch/x86/kernel/microcode_core.c | 326 +++++++++++++++++++++-----------------
arch/x86/kernel/microcode_intel.c | 92 +++-------
4 files changed, 261 insertions(+), 240 deletions(-)
(~20 new comment lines)
476 lines
14 KiB
C
476 lines
14 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 8.11 of Volume 3a, IA-32 Intel? Architecture
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* Software Developer's Manual
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* Order Number 253668 or free download from:
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*
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* http://developer.intel.com/design/pentium4/manuals/253668.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
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* speculative 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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#include <linux/firmware.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <asm/microcode.h>
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#include <asm/processor.h>
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#include <asm/msr.h>
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MODULE_DESCRIPTION("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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struct microcode_header_intel {
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unsigned int hdrver;
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unsigned int rev;
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unsigned int date;
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unsigned int sig;
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unsigned int cksum;
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unsigned int ldrver;
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unsigned int pf;
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unsigned int datasize;
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unsigned int totalsize;
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unsigned int reserved[3];
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};
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struct microcode_intel {
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struct microcode_header_intel hdr;
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unsigned int bits[0];
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};
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/* microcode format is extended from prescott processors */
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struct extended_signature {
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unsigned int sig;
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unsigned int pf;
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unsigned int cksum;
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};
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struct extended_sigtable {
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unsigned int count;
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unsigned int cksum;
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unsigned int reserved[3];
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struct extended_signature sigs[0];
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};
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#define DEFAULT_UCODE_DATASIZE (2000)
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#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
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#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
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#define EXT_HEADER_SIZE (sizeof(struct extended_sigtable))
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#define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature))
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#define DWSIZE (sizeof(u32))
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#define get_totalsize(mc) \
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(((struct microcode_intel *)mc)->hdr.totalsize ? \
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((struct microcode_intel *)mc)->hdr.totalsize : \
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DEFAULT_UCODE_TOTALSIZE)
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#define get_datasize(mc) \
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(((struct microcode_intel *)mc)->hdr.datasize ? \
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((struct microcode_intel *)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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static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
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{
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struct cpuinfo_x86 *c = &cpu_data(cpu_num);
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unsigned int val[2];
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memset(csig, 0, sizeof(*csig));
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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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return -1;
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}
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csig->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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csig->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], csig->rev);
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printk(KERN_INFO "microcode: CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
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cpu_num, csig->sig, csig->pf, csig->rev);
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return 0;
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}
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static inline int update_match_cpu(struct cpu_signature *csig, int sig, int pf)
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{
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return (!sigmatch(sig, csig->sig, pf, csig->pf)) ? 0 : 1;
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}
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static inline int
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update_match_revision(struct microcode_header_intel *mc_header, int rev)
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{
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return (mc_header->rev <= rev) ? 0 : 1;
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}
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static int microcode_sanity_check(void *mc)
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{
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unsigned long total_size, data_size, ext_table_size;
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struct microcode_header_intel *mc_header = mc;
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struct extended_sigtable *ext_header = NULL;
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int sum, orig_sum, ext_sigcount = 0, i;
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struct extended_signature *ext_sig;
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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 = (void *)ext_header + EXT_HEADER_SIZE +
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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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*/
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static int
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get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
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{
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struct microcode_header_intel *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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if (!update_match_revision(mc_header, rev))
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return 0;
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if (update_match_cpu(cpu_sig, mc_header->sig, mc_header->pf))
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return 1;
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/* Look for ext. headers: */
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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 = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
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ext_sigcount = ext_header->count;
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ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
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for (i = 0; i < ext_sigcount; i++) {
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if (update_match_cpu(cpu_sig, ext_sig->sig, ext_sig->pf))
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return 1;
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ext_sig++;
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}
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return 0;
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}
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static int apply_microcode(int cpu)
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{
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struct microcode_intel *mc_intel;
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struct ucode_cpu_info *uci;
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unsigned int val[2];
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int cpu_num;
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cpu_num = raw_smp_processor_id();
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uci = ucode_cpu_info + cpu;
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mc_intel = uci->mc;
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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 (mc_intel == NULL)
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return 0;
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/* write microcode via MSR 0x79 */
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wrmsr(MSR_IA32_UCODE_WRITE,
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(unsigned long) mc_intel->bits,
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(unsigned long) mc_intel->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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if (val[1] != mc_intel->hdr.rev) {
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printk(KERN_ERR "microcode: CPU%d update "
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"to revision 0x%x failed\n",
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cpu_num, mc_intel->hdr.rev);
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return -1;
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}
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printk(KERN_INFO "microcode: CPU%d updated to revision "
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"0x%x, date = %04x-%02x-%02x \n",
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cpu_num, val[1],
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mc_intel->hdr.date & 0xffff,
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mc_intel->hdr.date >> 24,
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(mc_intel->hdr.date >> 16) & 0xff);
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uci->cpu_sig.rev = val[1];
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return 0;
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}
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static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
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int (*get_ucode_data)(void *, const void *, size_t))
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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u8 *ucode_ptr = data, *new_mc = NULL, *mc;
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int new_rev = uci->cpu_sig.rev;
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unsigned int leftover = size;
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enum ucode_state state = UCODE_OK;
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while (leftover) {
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struct microcode_header_intel mc_header;
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unsigned int mc_size;
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if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
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break;
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mc_size = get_totalsize(&mc_header);
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if (!mc_size || mc_size > leftover) {
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printk(KERN_ERR "microcode: error!"
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"Bad data in microcode data file\n");
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break;
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}
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mc = vmalloc(mc_size);
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if (!mc)
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break;
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if (get_ucode_data(mc, ucode_ptr, mc_size) ||
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microcode_sanity_check(mc) < 0) {
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vfree(mc);
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break;
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}
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if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
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if (new_mc)
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vfree(new_mc);
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new_rev = mc_header.rev;
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new_mc = mc;
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} else
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vfree(mc);
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ucode_ptr += mc_size;
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leftover -= mc_size;
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}
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if (leftover) {
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if (new_mc)
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vfree(new_mc);
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state = UCODE_ERROR;
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goto out;
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}
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if (!new_mc) {
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state = UCODE_NFOUND;
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goto out;
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}
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if (uci->mc)
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vfree(uci->mc);
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uci->mc = (struct microcode_intel *)new_mc;
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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",
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cpu, new_rev, uci->cpu_sig.rev);
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out:
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return state;
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}
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static int get_ucode_fw(void *to, const void *from, size_t n)
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{
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memcpy(to, from, n);
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return 0;
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}
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static enum ucode_state request_microcode_fw(int cpu, struct device *device)
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{
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char name[30];
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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const struct firmware *firmware;
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enum ucode_state ret;
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sprintf(name, "intel-ucode/%02x-%02x-%02x",
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c->x86, c->x86_model, c->x86_mask);
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if (request_firmware(&firmware, name, device)) {
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pr_debug("microcode: data file %s load failed\n", name);
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return UCODE_NFOUND;
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}
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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)
|
|
{
|
|
return µcode_intel_ops;
|
|
}
|
|
|