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DEFINITIONS
This source file includes following definitions.
- collect_cpu_info_amd
- get_matching_microcode
- apply_microcode_amd
- get_next_ucode
- install_equiv_cpu_table
- free_equiv_cpu_table
- generic_load_microcode
- get_ucode_fw
- request_microcode_fw
- request_microcode_user
- microcode_fini_cpu_amd
- init_amd_microcode
/*
* AMD CPU Microcode Update Driver for Linux
* Copyright (C) 2008 Advanced Micro Devices Inc.
*
* Author: Peter Oruba <peter.oruba@amd.com>
*
* Based on work by:
* Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
*
* This driver allows to upgrade microcode on AMD
* family 0x10 and 0x11 processors.
*
* Licensed unter the terms of the GNU General Public
* License version 2. See file COPYING for details.
*/
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/cpu.h>
#include <linux/firmware.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <asm/msr.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/microcode.h>
MODULE_DESCRIPTION("AMD Microcode Update Driver");
MODULE_AUTHOR("Peter Oruba <peter.oruba@amd.com>");
MODULE_LICENSE("GPL v2");
#define UCODE_MAGIC 0x00414d44
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE 0x00000001
struct equiv_cpu_entry {
unsigned int installed_cpu;
unsigned int fixed_errata_mask;
unsigned int fixed_errata_compare;
unsigned int equiv_cpu;
};
struct microcode_header_amd {
unsigned int data_code;
unsigned int patch_id;
unsigned char mc_patch_data_id[2];
unsigned char mc_patch_data_len;
unsigned char init_flag;
unsigned int mc_patch_data_checksum;
unsigned int nb_dev_id;
unsigned int sb_dev_id;
unsigned char processor_rev_id[2];
unsigned char nb_rev_id;
unsigned char sb_rev_id;
unsigned char bios_api_rev;
unsigned char reserved1[3];
unsigned int match_reg[8];
};
struct microcode_amd {
struct microcode_header_amd hdr;
unsigned int mpb[0];
};
#define UCODE_MAX_SIZE (2048)
#define DEFAULT_UCODE_DATASIZE (896)
#define MC_HEADER_SIZE (sizeof(struct microcode_header_amd))
#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
#define DWSIZE (sizeof(u32))
/* For now we support a fixed ucode total size only */
#define get_totalsize(mc) \
((((struct microcode_amd *)mc)->hdr.mc_patch_data_len * 28) \
+ MC_HEADER_SIZE)
/* serialize access to the physical write */
static DEFINE_SPINLOCK(microcode_update_lock);
static struct equiv_cpu_entry *equiv_cpu_table;
static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
memset(csig, 0, sizeof(*csig));
if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
printk(KERN_ERR "microcode: CPU%d not a capable AMD processor\n",
cpu);
return -1;
}
asm volatile("movl %1, %%ecx; rdmsr"
: "=a" (csig->rev)
: "i" (0x0000008B) : "ecx");
printk(KERN_INFO "microcode: collect_cpu_info_amd : patch_id=0x%x\n",
csig->rev);
return 0;
}
static int get_matching_microcode(int cpu, void *mc, int rev)
{
struct microcode_header_amd *mc_header = mc;
struct pci_dev *nb_pci_dev, *sb_pci_dev;
unsigned int current_cpu_id;
unsigned int equiv_cpu_id = 0x00;
unsigned int i = 0;
BUG_ON(equiv_cpu_table == NULL);
current_cpu_id = cpuid_eax(0x00000001);
while (equiv_cpu_table[i].installed_cpu != 0) {
if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
equiv_cpu_id = equiv_cpu_table[i].equiv_cpu;
break;
}
i++;
}
if (!equiv_cpu_id) {
printk(KERN_ERR "microcode: CPU%d cpu_id "
"not found in equivalent cpu table \n", cpu);
return 0;
}
if ((mc_header->processor_rev_id[0]) != (equiv_cpu_id & 0xff)) {
printk(KERN_ERR
"microcode: CPU%d patch does not match "
"(patch is %x, cpu extended is %x) \n",
cpu, mc_header->processor_rev_id[0],
(equiv_cpu_id & 0xff));
return 0;
}
if ((mc_header->processor_rev_id[1]) != ((equiv_cpu_id >> 16) & 0xff)) {
printk(KERN_ERR "microcode: CPU%d patch does not match "
"(patch is %x, cpu base id is %x) \n",
cpu, mc_header->processor_rev_id[1],
((equiv_cpu_id >> 16) & 0xff));
return 0;
}
/* ucode may be northbridge specific */
if (mc_header->nb_dev_id) {
nb_pci_dev = pci_get_device(PCI_VENDOR_ID_AMD,
(mc_header->nb_dev_id & 0xff),
NULL);
if ((!nb_pci_dev) ||
(mc_header->nb_rev_id != nb_pci_dev->revision)) {
printk(KERN_ERR "microcode: CPU%d NB mismatch \n", cpu);
pci_dev_put(nb_pci_dev);
return 0;
}
pci_dev_put(nb_pci_dev);
}
/* ucode may be southbridge specific */
if (mc_header->sb_dev_id) {
sb_pci_dev = pci_get_device(PCI_VENDOR_ID_AMD,
(mc_header->sb_dev_id & 0xff),
NULL);
if ((!sb_pci_dev) ||
(mc_header->sb_rev_id != sb_pci_dev->revision)) {
printk(KERN_ERR "microcode: CPU%d SB mismatch \n", cpu);
pci_dev_put(sb_pci_dev);
return 0;
}
pci_dev_put(sb_pci_dev);
}
if (mc_header->patch_id <= rev)
return 0;
return 1;
}
static void apply_microcode_amd(int cpu)
{
unsigned long flags;
unsigned int eax, edx;
unsigned int rev;
int cpu_num = raw_smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
struct microcode_amd *mc_amd = uci->mc;
unsigned long addr;
/* We should bind the task to the CPU */
BUG_ON(cpu_num != cpu);
if (mc_amd == NULL)
return;
spin_lock_irqsave(µcode_update_lock, flags);
addr = (unsigned long)&mc_amd->hdr.data_code;
edx = (unsigned int)(((unsigned long)upper_32_bits(addr)));
eax = (unsigned int)(((unsigned long)lower_32_bits(addr)));
asm volatile("movl %0, %%ecx; wrmsr" :
: "i" (0xc0010020), "a" (eax), "d" (edx) : "ecx");
/* get patch id after patching */
asm volatile("movl %1, %%ecx; rdmsr"
: "=a" (rev)
: "i" (0x0000008B) : "ecx");
spin_unlock_irqrestore(µcode_update_lock, flags);
/* check current patch id and patch's id for match */
if (rev != mc_amd->hdr.patch_id) {
printk(KERN_ERR "microcode: CPU%d update from revision "
"0x%x to 0x%x failed\n", cpu_num,
mc_amd->hdr.patch_id, rev);
return;
}
printk(KERN_INFO "microcode: CPU%d updated from revision "
"0x%x to 0x%x \n",
cpu_num, uci->cpu_sig.rev, mc_amd->hdr.patch_id);
uci->cpu_sig.rev = rev;
}
static void * get_next_ucode(u8 *buf, unsigned int size,
int (*get_ucode_data)(void *, const void *, size_t),
unsigned int *mc_size)
{
unsigned int total_size;
#define UCODE_CONTAINER_SECTION_HDR 8
u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
void *mc;
if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
return NULL;
if (section_hdr[0] != UCODE_UCODE_TYPE) {
printk(KERN_ERR "microcode: error! "
"Wrong microcode payload type field\n");
return NULL;
}
total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8));
printk(KERN_INFO "microcode: size %u, total_size %u\n",
size, total_size);
if (total_size > size || total_size > UCODE_MAX_SIZE) {
printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
return NULL;
}
mc = vmalloc(UCODE_MAX_SIZE);
if (mc) {
memset(mc, 0, UCODE_MAX_SIZE);
if (get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR, total_size)) {
vfree(mc);
mc = NULL;
} else
*mc_size = total_size + UCODE_CONTAINER_SECTION_HDR;
}
#undef UCODE_CONTAINER_SECTION_HDR
return mc;
}
static int install_equiv_cpu_table(u8 *buf,
int (*get_ucode_data)(void *, const void *, size_t))
{
#define UCODE_CONTAINER_HEADER_SIZE 12
u8 *container_hdr[UCODE_CONTAINER_HEADER_SIZE];
unsigned int *buf_pos = (unsigned int *)container_hdr;
unsigned long size;
if (get_ucode_data(&container_hdr, buf, UCODE_CONTAINER_HEADER_SIZE))
return 0;
size = buf_pos[2];
if (buf_pos[1] != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
printk(KERN_ERR "microcode: error! "
"Wrong microcode equivalnet cpu table\n");
return 0;
}
equiv_cpu_table = (struct equiv_cpu_entry *) vmalloc(size);
if (!equiv_cpu_table) {
printk(KERN_ERR "microcode: error, can't allocate memory for equiv CPU table\n");
return 0;
}
buf += UCODE_CONTAINER_HEADER_SIZE;
if (get_ucode_data(equiv_cpu_table, buf, size)) {
vfree(equiv_cpu_table);
return 0;
}
return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
#undef UCODE_CONTAINER_HEADER_SIZE
}
static void free_equiv_cpu_table(void)
{
if (equiv_cpu_table) {
vfree(equiv_cpu_table);
equiv_cpu_table = NULL;
}
}
static int generic_load_microcode(int cpu, void *data, size_t size,
int (*get_ucode_data)(void *, const void *, size_t))
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
u8 *ucode_ptr = data, *new_mc = NULL, *mc;
int new_rev = uci->cpu_sig.rev;
unsigned int leftover;
unsigned long offset;
offset = install_equiv_cpu_table(ucode_ptr, get_ucode_data);
if (!offset) {
printk(KERN_ERR "microcode: installing equivalent cpu table failed\n");
return -EINVAL;
}
ucode_ptr += offset;
leftover = size - offset;
while (leftover) {
unsigned int uninitialized_var(mc_size);
struct microcode_header_amd *mc_header;
mc = get_next_ucode(ucode_ptr, leftover, get_ucode_data, &mc_size);
if (!mc)
break;
mc_header = (struct microcode_header_amd *)mc;
if (get_matching_microcode(cpu, mc, new_rev)) {
if (new_mc)
vfree(new_mc);
new_rev = mc_header->patch_id;
new_mc = mc;
} else
vfree(mc);
ucode_ptr += mc_size;
leftover -= mc_size;
}
if (new_mc) {
if (!leftover) {
if (uci->mc)
vfree(uci->mc);
uci->mc = new_mc;
pr_debug("microcode: CPU%d found a matching microcode update with"
" version 0x%x (current=0x%x)\n",
cpu, new_rev, uci->cpu_sig.rev);
} else
vfree(new_mc);
}
free_equiv_cpu_table();
return (int)leftover;
}
static int get_ucode_fw(void *to, const void *from, size_t n)
{
memcpy(to, from, n);
return 0;
}
static int request_microcode_fw(int cpu, struct device *device)
{
const char *fw_name = "amd-ucode/microcode_amd.bin";
const struct firmware *firmware;
int ret;
/* We should bind the task to the CPU */
BUG_ON(cpu != raw_smp_processor_id());
ret = request_firmware(&firmware, fw_name, device);
if (ret) {
printk(KERN_ERR "microcode: ucode data file %s load failed\n", fw_name);
return ret;
}
ret = generic_load_microcode(cpu, (void*)firmware->data, firmware->size,
&get_ucode_fw);
release_firmware(firmware);
return ret;
}
static int request_microcode_user(int cpu, const void __user *buf, size_t size)
{
printk(KERN_WARNING "microcode: AMD microcode update via /dev/cpu/microcode"
"is not supported\n");
return -1;
}
static void microcode_fini_cpu_amd(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
vfree(uci->mc);
uci->mc = NULL;
}
static struct microcode_ops microcode_amd_ops = {
.request_microcode_user = request_microcode_user,
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info_amd,
.apply_microcode = apply_microcode_amd,
.microcode_fini_cpu = microcode_fini_cpu_amd,
};
struct microcode_ops * __init init_amd_microcode(void)
{
return µcode_amd_ops;
}