linux/arch/x86/kernel/microcode_amd.c
Dan Carpenter 1396fa9cd2 x86, microcode, AMD: Fix signedness bug in generic_load_microcode()
install_equiv_cpu_table() returns type int.  It uses negative
error codes so using an unsigned type breaks the error handling.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: open list:AMD MICROCODE UPD... <amd64-microcode@amd64.org>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20110218091716.GA4384@bicker>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-02-20 14:01:32 +01:00

354 lines
7.8 KiB
C

/*
* 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 under the terms of the GNU General Public
* License version 2. See file COPYING for details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/firmware.h>
#include <linux/pci_ids.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/microcode.h>
#include <asm/processor.h>
#include <asm/msr.h>
MODULE_DESCRIPTION("AMD Microcode Update Driver");
MODULE_AUTHOR("Peter Oruba");
MODULE_LICENSE("GPL v2");
#define UCODE_MAGIC 0x00414d44
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE 0x00000001
struct equiv_cpu_entry {
u32 installed_cpu;
u32 fixed_errata_mask;
u32 fixed_errata_compare;
u16 equiv_cpu;
u16 res;
} __attribute__((packed));
struct microcode_header_amd {
u32 data_code;
u32 patch_id;
u16 mc_patch_data_id;
u8 mc_patch_data_len;
u8 init_flag;
u32 mc_patch_data_checksum;
u32 nb_dev_id;
u32 sb_dev_id;
u16 processor_rev_id;
u8 nb_rev_id;
u8 sb_rev_id;
u8 bios_api_rev;
u8 reserved1[3];
u32 match_reg[8];
} __attribute__((packed));
struct microcode_amd {
struct microcode_header_amd hdr;
unsigned int mpb[0];
};
#define UCODE_CONTAINER_SECTION_HDR 8
#define UCODE_CONTAINER_HEADER_SIZE 12
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);
u32 dummy;
if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
return -1;
}
rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
return 0;
}
static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr,
int rev)
{
unsigned int current_cpu_id;
u16 equiv_cpu_id = 0;
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)
return 0;
if (mc_hdr->processor_rev_id != equiv_cpu_id)
return 0;
/* ucode might be chipset specific -- currently we don't support this */
if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) {
pr_err("CPU%d: chipset specific code not yet supported\n",
cpu);
return 0;
}
if (mc_hdr->patch_id <= rev)
return 0;
return 1;
}
static int apply_microcode_amd(int cpu)
{
u32 rev, dummy;
int cpu_num = raw_smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
struct microcode_amd *mc_amd = uci->mc;
/* We should bind the task to the CPU */
BUG_ON(cpu_num != cpu);
if (mc_amd == NULL)
return 0;
wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
/* get patch id after patching */
rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
/* check current patch id and patch's id for match */
if (rev != mc_amd->hdr.patch_id) {
pr_err("CPU%d: update failed for patch_level=0x%08x\n",
cpu, mc_amd->hdr.patch_id);
return -1;
}
pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
uci->cpu_sig.rev = rev;
return 0;
}
static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
unsigned int max_size, actual_size;
#define F1XH_MPB_MAX_SIZE 2048
#define F14H_MPB_MAX_SIZE 1824
#define F15H_MPB_MAX_SIZE 4096
switch (c->x86) {
case 0x14:
max_size = F14H_MPB_MAX_SIZE;
break;
case 0x15:
max_size = F15H_MPB_MAX_SIZE;
break;
default:
max_size = F1XH_MPB_MAX_SIZE;
break;
}
actual_size = buf[4] + (buf[5] << 8);
if (actual_size > size || actual_size > max_size) {
pr_err("section size mismatch\n");
return 0;
}
return actual_size;
}
static struct microcode_header_amd *
get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size)
{
struct microcode_header_amd *mc = NULL;
unsigned int actual_size = 0;
if (buf[0] != UCODE_UCODE_TYPE) {
pr_err("invalid type field in container file section header\n");
goto out;
}
actual_size = verify_ucode_size(cpu, buf, size);
if (!actual_size)
goto out;
mc = vzalloc(actual_size);
if (!mc)
goto out;
get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR, actual_size);
*mc_size = actual_size + UCODE_CONTAINER_SECTION_HDR;
out:
return mc;
}
static int install_equiv_cpu_table(const u8 *buf)
{
unsigned int *ibuf = (unsigned int *)buf;
unsigned int type = ibuf[1];
unsigned int size = ibuf[2];
if (type != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
pr_err("empty section/"
"invalid type field in container file section header\n");
return -EINVAL;
}
equiv_cpu_table = vmalloc(size);
if (!equiv_cpu_table) {
pr_err("failed to allocate equivalent CPU table\n");
return -ENOMEM;
}
get_ucode_data(equiv_cpu_table, buf + UCODE_CONTAINER_HEADER_SIZE, size);
return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
}
static void free_equiv_cpu_table(void)
{
vfree(equiv_cpu_table);
equiv_cpu_table = NULL;
}
static enum ucode_state
generic_load_microcode(int cpu, const u8 *data, size_t size)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct microcode_header_amd *mc_hdr = NULL;
unsigned int mc_size, leftover;
int offset;
const u8 *ucode_ptr = data;
void *new_mc = NULL;
unsigned int new_rev = uci->cpu_sig.rev;
enum ucode_state state = UCODE_OK;
offset = install_equiv_cpu_table(ucode_ptr);
if (offset < 0) {
pr_err("failed to create equivalent cpu table\n");
return UCODE_ERROR;
}
ucode_ptr += offset;
leftover = size - offset;
while (leftover) {
mc_hdr = get_next_ucode(cpu, ucode_ptr, leftover, &mc_size);
if (!mc_hdr)
break;
if (get_matching_microcode(cpu, mc_hdr, new_rev)) {
vfree(new_mc);
new_rev = mc_hdr->patch_id;
new_mc = mc_hdr;
} else
vfree(mc_hdr);
ucode_ptr += mc_size;
leftover -= mc_size;
}
if (!new_mc) {
state = UCODE_NFOUND;
goto free_table;
}
if (!leftover) {
vfree(uci->mc);
uci->mc = new_mc;
pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n",
cpu, uci->cpu_sig.rev, new_rev);
} else {
vfree(new_mc);
state = UCODE_ERROR;
}
free_table:
free_equiv_cpu_table();
return state;
}
static enum ucode_state request_microcode_amd(int cpu, struct device *device)
{
const char *fw_name = "amd-ucode/microcode_amd.bin";
const struct firmware *fw;
enum ucode_state ret = UCODE_NFOUND;
if (request_firmware(&fw, fw_name, device)) {
pr_err("failed to load file %s\n", fw_name);
goto out;
}
ret = UCODE_ERROR;
if (*(u32 *)fw->data != UCODE_MAGIC) {
pr_err("invalid magic value (0x%08x)\n", *(u32 *)fw->data);
goto fw_release;
}
ret = generic_load_microcode(cpu, fw->data, fw->size);
fw_release:
release_firmware(fw);
out:
return ret;
}
static enum ucode_state
request_microcode_user(int cpu, const void __user *buf, size_t size)
{
pr_info("AMD microcode update via /dev/cpu/microcode not supported\n");
return UCODE_ERROR;
}
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_amd,
.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 &microcode_amd_ops;
}