![Kay Sievers](/assets/img/avatar_default.png)
This adds support for misc devices to report their requested nodename to userspace. It also updates a number of misc drivers to provide the needed subdirectory and device name to be used for them. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jan Blunck <jblunck@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
571 lines
14 KiB
C
571 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/platform_device.h>
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#include <linux/miscdevice.h>
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#include <linux/capability.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/cpu.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <asm/microcode.h>
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#include <asm/processor.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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#define MICROCODE_VERSION "2.00"
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static struct microcode_ops *microcode_ops;
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/*
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* Synchronization.
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*
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* All non cpu-hotplug-callback call sites use:
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*
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* - microcode_mutex to synchronize with each other;
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* - get/put_online_cpus() to synchronize with
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* the cpu-hotplug-callback call sites.
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*
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* We guarantee that only a single cpu is being
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* updated at any particular moment of time.
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*/
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static DEFINE_MUTEX(microcode_mutex);
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struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
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EXPORT_SYMBOL_GPL(ucode_cpu_info);
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/*
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* Operations that are run on a target cpu:
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*/
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struct cpu_info_ctx {
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struct cpu_signature *cpu_sig;
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int err;
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};
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static void collect_cpu_info_local(void *arg)
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{
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struct cpu_info_ctx *ctx = arg;
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ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
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ctx->cpu_sig);
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}
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static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
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{
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struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
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int ret;
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ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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return ret;
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}
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static int collect_cpu_info(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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int ret;
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memset(uci, 0, sizeof(*uci));
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ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
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if (!ret)
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uci->valid = 1;
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return ret;
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}
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struct apply_microcode_ctx {
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int err;
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};
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static void apply_microcode_local(void *arg)
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{
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struct apply_microcode_ctx *ctx = arg;
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ctx->err = microcode_ops->apply_microcode(smp_processor_id());
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}
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static int apply_microcode_on_target(int cpu)
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{
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struct apply_microcode_ctx ctx = { .err = 0 };
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int ret;
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ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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return ret;
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}
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#ifdef CONFIG_MICROCODE_OLD_INTERFACE
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static int do_microcode_update(const void __user *buf, size_t size)
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{
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int error = 0;
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int cpu;
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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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enum ucode_state ustate;
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if (!uci->valid)
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continue;
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ustate = microcode_ops->request_microcode_user(cpu, buf, size);
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if (ustate == UCODE_ERROR) {
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error = -1;
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break;
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} else if (ustate == UCODE_OK)
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apply_microcode_on_target(cpu);
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}
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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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cycle_kernel_lock();
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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,
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size_t len, loff_t *ppos)
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{
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ssize_t ret = -EINVAL;
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if ((len >> PAGE_SHIFT) > num_physpages) {
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pr_err("microcode: too much data (max %ld pages)\n", num_physpages);
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return ret;
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}
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get_online_cpus();
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mutex_lock(µcode_mutex);
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if (do_microcode_update(buf, len) == 0)
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ret = (ssize_t)len;
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mutex_unlock(µcode_mutex);
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put_online_cpus();
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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,
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.open = microcode_open,
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};
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static struct miscdevice microcode_dev = {
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.minor = MICROCODE_MINOR,
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.name = "microcode",
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.devnode = "cpu/microcode",
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.fops = µcode_fops,
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};
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static int __init microcode_dev_init(void)
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{
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int error;
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error = misc_register(µcode_dev);
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if (error) {
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pr_err("microcode: can't misc_register on minor=%d\n", MICROCODE_MINOR);
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return error;
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}
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return 0;
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}
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static void microcode_dev_exit(void)
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{
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misc_deregister(µcode_dev);
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}
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MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
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#else
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#define microcode_dev_init() 0
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#define microcode_dev_exit() do { } while (0)
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#endif
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/* fake device for request_firmware */
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static struct platform_device *microcode_pdev;
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static int reload_for_cpu(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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int err = 0;
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mutex_lock(µcode_mutex);
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if (uci->valid) {
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enum ucode_state ustate;
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ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev);
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if (ustate == UCODE_OK)
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apply_microcode_on_target(cpu);
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else
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if (ustate == UCODE_ERROR)
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err = -EINVAL;
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}
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mutex_unlock(µcode_mutex);
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return err;
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}
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static ssize_t reload_store(struct sys_device *dev,
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struct sysdev_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned long val;
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int cpu = dev->id;
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int ret = 0;
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char *end;
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val = simple_strtoul(buf, &end, 0);
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if (end == buf)
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return -EINVAL;
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if (val == 1) {
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get_online_cpus();
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if (cpu_online(cpu))
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ret = reload_for_cpu(cpu);
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put_online_cpus();
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}
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if (!ret)
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ret = size;
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return ret;
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}
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static ssize_t version_show(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
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return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
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}
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static ssize_t pf_show(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
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return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
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}
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static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
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static SYSDEV_ATTR(version, 0400, version_show, NULL);
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static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
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static struct attribute *mc_default_attrs[] = {
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&attr_reload.attr,
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&attr_version.attr,
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&attr_processor_flags.attr,
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NULL
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};
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static struct attribute_group mc_attr_group = {
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.attrs = mc_default_attrs,
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.name = "microcode",
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};
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static void microcode_fini_cpu(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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microcode_ops->microcode_fini_cpu(cpu);
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uci->valid = 0;
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}
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static enum ucode_state microcode_resume_cpu(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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if (!uci->mc)
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return UCODE_NFOUND;
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pr_debug("microcode: CPU%d updated upon resume\n", cpu);
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apply_microcode_on_target(cpu);
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return UCODE_OK;
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}
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static enum ucode_state microcode_init_cpu(int cpu)
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{
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enum ucode_state ustate;
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if (collect_cpu_info(cpu))
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return UCODE_ERROR;
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/* --dimm. Trigger a delayed update? */
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if (system_state != SYSTEM_RUNNING)
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return UCODE_NFOUND;
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ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev);
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if (ustate == UCODE_OK) {
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pr_debug("microcode: CPU%d updated upon init\n", cpu);
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apply_microcode_on_target(cpu);
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}
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return ustate;
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}
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static enum ucode_state microcode_update_cpu(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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enum ucode_state ustate;
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if (uci->valid)
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ustate = microcode_resume_cpu(cpu);
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else
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ustate = microcode_init_cpu(cpu);
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return ustate;
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}
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static int mc_sysdev_add(struct sys_device *sys_dev)
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{
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int err, cpu = sys_dev->id;
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if (!cpu_online(cpu))
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return 0;
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pr_debug("microcode: CPU%d added\n", cpu);
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err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
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if (err)
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return err;
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if (microcode_init_cpu(cpu) == UCODE_ERROR)
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err = -EINVAL;
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return err;
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}
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static int mc_sysdev_remove(struct sys_device *sys_dev)
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{
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int cpu = sys_dev->id;
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if (!cpu_online(cpu))
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return 0;
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pr_debug("microcode: CPU%d removed\n", cpu);
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microcode_fini_cpu(cpu);
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sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
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return 0;
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}
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static int mc_sysdev_resume(struct sys_device *dev)
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{
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int cpu = dev->id;
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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if (!cpu_online(cpu))
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return 0;
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/*
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* All non-bootup cpus are still disabled,
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* so only CPU 0 will apply ucode here.
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*
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* Moreover, there can be no concurrent
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* updates from any other places at this point.
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*/
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WARN_ON(cpu != 0);
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if (uci->valid && uci->mc)
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microcode_ops->apply_microcode(cpu);
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return 0;
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}
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static struct sysdev_driver mc_sysdev_driver = {
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.add = mc_sysdev_add,
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.remove = mc_sysdev_remove,
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.resume = mc_sysdev_resume,
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};
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static __cpuinit int
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mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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struct sys_device *sys_dev;
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sys_dev = get_cpu_sysdev(cpu);
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switch (action) {
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case CPU_ONLINE:
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case CPU_ONLINE_FROZEN:
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microcode_update_cpu(cpu);
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case CPU_DOWN_FAILED:
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case CPU_DOWN_FAILED_FROZEN:
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pr_debug("microcode: CPU%d added\n", cpu);
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if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
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pr_err("microcode: Failed to create group for CPU%d\n", cpu);
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break;
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case CPU_DOWN_PREPARE:
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case CPU_DOWN_PREPARE_FROZEN:
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/* Suspend is in progress, only remove the interface */
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sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
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pr_debug("microcode: CPU%d removed\n", cpu);
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break;
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case CPU_DEAD:
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case CPU_UP_CANCELED_FROZEN:
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/* The CPU refused to come up during a system resume */
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microcode_fini_cpu(cpu);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block __refdata mc_cpu_notifier = {
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.notifier_call = mc_cpu_callback,
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};
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static int __init microcode_init(void)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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int error;
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if (c->x86_vendor == X86_VENDOR_INTEL)
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microcode_ops = init_intel_microcode();
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else if (c->x86_vendor == X86_VENDOR_AMD)
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microcode_ops = init_amd_microcode();
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if (!microcode_ops) {
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pr_err("microcode: no support for this CPU vendor\n");
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return -ENODEV;
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}
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microcode_pdev = platform_device_register_simple("microcode", -1,
|
|
NULL, 0);
|
|
if (IS_ERR(microcode_pdev)) {
|
|
microcode_dev_exit();
|
|
return PTR_ERR(microcode_pdev);
|
|
}
|
|
|
|
get_online_cpus();
|
|
mutex_lock(µcode_mutex);
|
|
|
|
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
|
|
|
|
mutex_unlock(µcode_mutex);
|
|
put_online_cpus();
|
|
|
|
if (error) {
|
|
platform_device_unregister(microcode_pdev);
|
|
return error;
|
|
}
|
|
|
|
error = microcode_dev_init();
|
|
if (error)
|
|
return error;
|
|
|
|
register_hotcpu_notifier(&mc_cpu_notifier);
|
|
|
|
pr_info("Microcode Update Driver: v" MICROCODE_VERSION
|
|
" <tigran@aivazian.fsnet.co.uk>,"
|
|
" Peter Oruba\n");
|
|
|
|
return 0;
|
|
}
|
|
module_init(microcode_init);
|
|
|
|
static void __exit microcode_exit(void)
|
|
{
|
|
microcode_dev_exit();
|
|
|
|
unregister_hotcpu_notifier(&mc_cpu_notifier);
|
|
|
|
get_online_cpus();
|
|
mutex_lock(µcode_mutex);
|
|
|
|
sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
|
|
|
|
mutex_unlock(µcode_mutex);
|
|
put_online_cpus();
|
|
|
|
platform_device_unregister(microcode_pdev);
|
|
|
|
microcode_ops = NULL;
|
|
|
|
pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
|
|
}
|
|
module_exit(microcode_exit);
|