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/*
* AMD CPU Microcode Update Driver for Linux
*
* This driver allows to upgrade microcode on F10h AMD
* CPUs and later.
*
* Copyright (C) 2008-2011 Advanced Micro Devices Inc.
* 2013-2016 Borislav Petkov <bp@alien8.de>
*
* Author: Peter Oruba <peter.oruba@amd.com>
*
* Based on work by:
* Tigran Aivazian <aivazian.tigran@gmail.com>
*
* early loader:
* Copyright (C) 2013 Advanced Micro Devices, Inc.
*
* Author: Jacob Shin <jacob.shin@amd.com>
* Fixes: Borislav Petkov <bp@suse.de>
*
* Licensed under the terms of the GNU General Public
* License version 2. See file COPYING for details.
*/
#define pr_fmt(fmt) "microcode: " fmt
#include <linux/earlycpio.h>
#include <linux/firmware.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/initrd.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <asm/microcode_amd.h>
#include <asm/microcode.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/cpu.h>
#include <asm/msr.h>
static struct equiv_cpu_entry *equiv_cpu_table;
/*
* This points to the current valid container of microcode patches which we will
* save from the initrd/builtin before jettisoning its contents. @mc is the
* microcode patch we found to match.
*/
struct cont_desc {
struct microcode_amd *mc;
u32 cpuid_1_eax;
u32 psize;
u8 *data;
size_t size;
};
static u32 ucode_new_rev;
static u8 amd_ucode_patch[PATCH_MAX_SIZE];
/*
* Microcode patch container file is prepended to the initrd in cpio
* format. See Documentation/x86/early-microcode.txt
*/
static const char
ucode_path[] __maybe_unused = "kernel/x86/microcode/AuthenticAMD.bin";
static u16 find_equiv_id(struct equiv_cpu_entry *equiv_table, u32 sig)
{
for (; equiv_table && equiv_table->installed_cpu; equiv_table++) {
if (sig == equiv_table->installed_cpu)
return equiv_table->equiv_cpu;
}
return 0;
}
/*
* This scans the ucode blob for the proper container as we can have multiple
* containers glued together. Returns the equivalence ID from the equivalence
* table or 0 if none found.
* Returns the amount of bytes consumed while scanning. @desc contains all the
* data we're going to use in later stages of the application.
*/
static ssize_t parse_container(u8 *ucode, ssize_t size, struct cont_desc *desc)
{
struct equiv_cpu_entry *eq;
ssize_t orig_size = size;
u32 *hdr = (u32 *)ucode;
u16 eq_id;
u8 *buf;
/* Am I looking at an equivalence table header? */
if (hdr[0] != UCODE_MAGIC ||
hdr[1] != UCODE_EQUIV_CPU_TABLE_TYPE ||
hdr[2] == 0)
return CONTAINER_HDR_SZ;
buf = ucode;
eq = (struct equiv_cpu_entry *)(buf + CONTAINER_HDR_SZ);
/* Find the equivalence ID of our CPU in this table: */
eq_id = find_equiv_id(eq, desc->cpuid_1_eax);
buf += hdr[2] + CONTAINER_HDR_SZ;
size -= hdr[2] + CONTAINER_HDR_SZ;
/*
* Scan through the rest of the container to find where it ends. We do
* some basic sanity-checking too.
*/
while (size > 0) {
struct microcode_amd *mc;
u32 patch_size;
hdr = (u32 *)buf;
if (hdr[0] != UCODE_UCODE_TYPE)
break;
/* Sanity-check patch size. */
patch_size = hdr[1];
if (patch_size > PATCH_MAX_SIZE)
break;
/* Skip patch section header: */
buf += SECTION_HDR_SIZE;
size -= SECTION_HDR_SIZE;
mc = (struct microcode_amd *)buf;
if (eq_id == mc->hdr.processor_rev_id) {
desc->psize = patch_size;
desc->mc = mc;
}
buf += patch_size;
size -= patch_size;
}
/*
* If we have found a patch (desc->mc), it means we're looking at the
* container which has a patch for this CPU so return 0 to mean, @ucode
* already points to the proper container. Otherwise, we return the size
* we scanned so that we can advance to the next container in the
* buffer.
*/
if (desc->mc) {
desc->data = ucode;
desc->size = orig_size - size;
return 0;
}
return orig_size - size;
}
/*
* Scan the ucode blob for the proper container as we can have multiple
* containers glued together.
*/
static void scan_containers(u8 *ucode, size_t size, struct cont_desc *desc)
{
ssize_t rem = size;
while (rem >= 0) {
ssize_t s = parse_container(ucode, rem, desc);
if (!s)
return;
ucode += s;
rem -= s;
}
}
static int __apply_microcode_amd(struct microcode_amd *mc)
{
u32 rev, dummy;
native_wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc->hdr.data_code);
/* verify patch application was successful */
native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
if (rev != mc->hdr.patch_id)
return -1;
return 0;
}
/*
* Early load occurs before we can vmalloc(). So we look for the microcode
* patch container file in initrd, traverse equivalent cpu table, look for a
* matching microcode patch, and update, all in initrd memory in place.
* When vmalloc() is available for use later -- on 64-bit during first AP load,
* and on 32-bit during save_microcode_in_initrd_amd() -- we can call
* load_microcode_amd() to save equivalent cpu table and microcode patches in
* kernel heap memory.
*
* Returns true if container found (sets @desc), false otherwise.
*/
static bool
apply_microcode_early_amd(u32 cpuid_1_eax, void *ucode, size_t size, bool save_patch)
{
struct cont_desc desc = { 0 };
u8 (*patch)[PATCH_MAX_SIZE];
struct microcode_amd *mc;
u32 rev, dummy, *new_rev;
bool ret = false;
#ifdef CONFIG_X86_32
new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
patch = (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
#else
new_rev = &ucode_new_rev;
patch = &amd_ucode_patch;
#endif
desc.cpuid_1_eax = cpuid_1_eax;
scan_containers(ucode, size, &desc);
mc = desc.mc;
if (!mc)
return ret;
native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
if (rev >= mc->hdr.patch_id)
return
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