LinuxLists.cc - [patch 4/9] [PATCH 4/9] x86: Code split to two parts.

2008-07-25 16:18:06

Subject: [patch 4/9] [PATCH 4/9] x86: Code split to two parts.

Split off existing code into two seperate files. One file holds general
code, the other file vendor specific parts. No functional changes, only
refactoring. Temporarily Introduced a new module name 'ucode' for result,
due to already taken name 'microcode'.

Signed-off-by: Peter Oruba <[email protected]>
---
arch/x86/kernel/Makefile | 3 +-
arch/x86/kernel/microcode.c | 421 +-----------------------------
arch/x86/kernel/microcode_intel.c | 513 +++++++++++++++++++++++++++++++++++++
3 files changed, 530 insertions(+), 407 deletions(-)
create mode 100644 arch/x86/kernel/microcode_intel.c

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 3db651f..abb32ae 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -51,7 +51,8 @@ obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o
obj-$(CONFIG_MCA) += mca_32.o
obj-$(CONFIG_X86_MSR) += msr.o
obj-$(CONFIG_X86_CPUID) += cpuid.o
-obj-$(CONFIG_MICROCODE) += microcode.o
+obj-$(CONFIG_MICROCODE) += ucode.o
+ucode-objs := microcode.o microcode_intel.o
obj-$(CONFIG_PCI) += early-quirks.o
apm-y := apm_32.o
obj-$(CONFIG_APM) += apm.o
diff --git a/arch/x86/kernel/microcode.c b/arch/x86/kernel/microcode.c
index d3bc0e8..72b899c 100644
--- a/arch/x86/kernel/microcode.c
+++ b/arch/x86/kernel/microcode.c
@@ -95,286 +95,29 @@
#include <asm/processor.h>
#include <asm/microcode.h>

-MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
+MODULE_DESCRIPTION("Microcode Update Driver");
MODULE_AUTHOR("Tigran Aivazian <[email protected]>");
MODULE_LICENSE("GPL");

#define MICROCODE_VERSION "1.14a"

-#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
-#define MC_HEADER_SIZE (sizeof (struct microcode_header)) /* 48 bytes */
-#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
-#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
-#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
-#define DWSIZE (sizeof (u32))
-#define get_totalsize(mc) \
- (((struct microcode *)mc)->hdr.totalsize ? \
- ((struct microcode *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
-#define get_datasize(mc) \
- (((struct microcode *)mc)->hdr.datasize ? \
- ((struct microcode *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
-
-#define sigmatch(s1, s2, p1, p2) \
- (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
-
-#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
-
-/* serialize access to the physical write to MSR 0x79 */
-static DEFINE_SPINLOCK(microcode_update_lock);
-
/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
-static DEFINE_MUTEX(microcode_mutex);
-
-static struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
-
-static void collect_cpu_info(int cpu_num)
-{
- struct cpuinfo_x86 *c = &cpu_data(cpu_num);
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
- unsigned int val[2];
-
- /* We should bind the task to the CPU */
- BUG_ON(raw_smp_processor_id() != cpu_num);
- uci->pf = uci->rev = 0;
- uci->mc = NULL;
- uci->valid = 1;
-
- if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
- cpu_has(c, X86_FEATURE_IA64)) {
- printk(KERN_ERR "microcode: CPU%d not a capable Intel "
- "processor\n", cpu_num);
- uci->valid = 0;
- return;
- }
-
- uci->sig = cpuid_eax(0x00000001);
-
- if ((c->x86_model >= 5) || (c->x86 > 6)) {
- /* get processor flags from MSR 0x17 */
- rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
- uci->pf = 1 << ((val[1] >> 18) & 7);
- }
-
- wrmsr(MSR_IA32_UCODE_REV, 0, 0);
- /* see notes above for revision 1.07. Apparent chip bug */
- sync_core();
- /* get the current revision from MSR 0x8B */
- rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
- pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
- uci->sig, uci->pf, uci->rev);
-}
-
-static inline int microcode_update_match(int cpu_num,
- struct microcode_header *mc_header, int sig, int pf)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
-
- if (!sigmatch(sig, uci->sig, pf, uci->pf)
- || mc_header->rev <= uci->rev)
- return 0;
- return 1;
-}
-
-static int microcode_sanity_check(void *mc)
-{
- struct microcode_header *mc_header = mc;
- struct extended_sigtable *ext_header = NULL;
- struct extended_signature *ext_sig;
- unsigned long total_size, data_size, ext_table_size;
- int sum, orig_sum, ext_sigcount = 0, i;
-
- total_size = get_totalsize(mc_header);
- data_size = get_datasize(mc_header);
- if (data_size + MC_HEADER_SIZE > total_size) {
- printk(KERN_ERR "microcode: error! "
- "Bad data size in microcode data file\n");
- return -EINVAL;
- }
+DEFINE_MUTEX(microcode_mutex);

- if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
- printk(KERN_ERR "microcode: error! "
- "Unknown microcode update format\n");
- return -EINVAL;
- }
- ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
- if (ext_table_size) {
- if ((ext_table_size < EXT_HEADER_SIZE)
- || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
- printk(KERN_ERR "microcode: error! "
- "Small exttable size in microcode data file\n");
- return -EINVAL;
- }
- ext_header = mc + MC_HEADER_SIZE + data_size;
- if (ext_table_size != exttable_size(ext_header)) {
- printk(KERN_ERR "microcode: error! "
- "Bad exttable size in microcode data file\n");
- return -EFAULT;
- }
- ext_sigcount = ext_header->count;
- }
+struct ucode_cpu_info ucode_cpu_info[NR_CPUS];

- /* check extended table checksum */
- if (ext_table_size) {
- int ext_table_sum = 0;
- int *ext_tablep = (int *)ext_header;
-
- i = ext_table_size / DWSIZE;
- while (i--)
- ext_table_sum += ext_tablep[i];
- if (ext_table_sum) {
- printk(KERN_WARNING "microcode: aborting, "
- "bad extended signature table checksum\n");
- return -EINVAL;
- }
- }
-
- /* calculate the checksum */
- orig_sum = 0;
- i = (MC_HEADER_SIZE + data_size) / DWSIZE;
- while (i--)
- orig_sum += ((int *)mc)[i];
- if (orig_sum) {
- printk(KERN_ERR "microcode: aborting, bad checksum\n");
- return -EINVAL;
- }
- if (!ext_table_size)
- return 0;
- /* check extended signature checksum */
- for (i = 0; i < ext_sigcount; i++) {
- ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
- EXT_SIGNATURE_SIZE * i;
- sum = orig_sum
- - (mc_header->sig + mc_header->pf + mc_header->cksum)
- + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
- if (sum) {
- printk(KERN_ERR "microcode: aborting, bad checksum\n");
- return -EINVAL;
- }
- }
- return 0;
-}
-
-/*
- * return 0 - no update found
- * return 1 - found update
- * return < 0 - error
- */
-static int get_maching_microcode(void *mc, int cpu)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- struct microcode_header *mc_header = mc;
- struct extended_sigtable *ext_header;
- unsigned long total_size = get_totalsize(mc_header);
- int ext_sigcount, i;
- struct extended_signature *ext_sig;
- void *new_mc;
-
- if (microcode_update_match(cpu, mc_header,
- mc_header->sig, mc_header->pf))
- goto find;
-
- if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
- return 0;
-
- ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
- ext_sigcount = ext_header->count;
- ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
- for (i = 0; i < ext_sigcount; i++) {
- if (microcode_update_match(cpu, mc_header,
- ext_sig->sig, ext_sig->pf))
- goto find;
- ext_sig++;
- }
- return 0;
-find:
- pr_debug("microcode: CPU%d found a matching microcode update with"
- " version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
- new_mc = vmalloc(total_size);
- if (!new_mc) {
- printk(KERN_ERR "microcode: error! Can not allocate memory\n");
- return -ENOMEM;
- }
-
- /* free previous update file */
- vfree(uci->mc);
-
- memcpy(new_mc, mc, total_size);
- uci->mc = new_mc;
- return 1;
-}
-
-static void apply_microcode(int cpu)
-{
- unsigned long flags;
- unsigned int val[2];
- int cpu_num = raw_smp_processor_id();
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
-
- /* We should bind the task to the CPU */
- BUG_ON(cpu_num != cpu);
-
- if (uci->mc == NULL)
- return;
-
- /* serialize access to the physical write to MSR 0x79 */
- spin_lock_irqsave(&microcode_update_lock, flags);
-
- /* write microcode via MSR 0x79 */
- wrmsr(MSR_IA32_UCODE_WRITE,
- (unsigned long) uci->mc->bits,
- (unsigned long) uci->mc->bits >> 16 >> 16);
- wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-
- /* see notes above for revision 1.07. Apparent chip bug */
- sync_core();
-
- /* get the current revision from MSR 0x8B */
- rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
-
- spin_unlock_irqrestore(&microcode_update_lock, flags);
- if (val[1] != uci->mc->hdr.rev) {
- printk(KERN_ERR "microcode: CPU%d update from revision "
- "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
- return;
- }
- printk(KERN_INFO "microcode: CPU%d updated from revision "
- "0x%x to 0x%x, date = %08x \n",
- cpu_num, uci->rev, val[1], uci->mc->hdr.date);
- uci->rev = val[1];
-}
+extern long get_next_ucode(void **mc, long offset);
+extern int microcode_sanity_check(void *mc);
+extern int get_matching_microcode(void *mc, int cpu);
+extern void collect_cpu_info(int cpu_num);
+extern int cpu_request_microcode(int cpu);
+extern void microcode_fini_cpu(int cpu);
+extern void apply_microcode(int cpu);
+extern int apply_microcode_check_cpu(int cpu);

#ifdef CONFIG_MICROCODE_OLD_INTERFACE
-static void __user *user_buffer; /* user area microcode data buffer */
-static unsigned int user_buffer_size; /* it's size */
-
-static long get_next_ucode(void **mc, long offset)
-{
- struct microcode_header mc_header;
- unsigned long total_size;
-
- /* No more data */
- if (offset >= user_buffer_size)
- return 0;
- if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
- printk(KERN_ERR "microcode: error! Can not read user data\n");
- return -EFAULT;
- }
- total_size = get_totalsize(&mc_header);
- if (offset + total_size > user_buffer_size) {
- printk(KERN_ERR "microcode: error! Bad total size in microcode "
- "data file\n");
- return -EINVAL;
- }
- *mc = vmalloc(total_size);
- if (!*mc)
- return -ENOMEM;
- if (copy_from_user(*mc, user_buffer + offset, total_size)) {
- printk(KERN_ERR "microcode: error! Can not read user data\n");
- vfree(*mc);
- return -EFAULT;
- }
- return offset + total_size;
-}
+void __user *user_buffer; /* user area microcode data buffer */
+unsigned int user_buffer_size; /* it's size */

static int do_microcode_update (void)
{
@@ -400,7 +143,7 @@ static int do_microcode_update (void)
if (!uci->valid)
continue;
set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
- error = get_maching_microcode(new_mc, cpu);
+ error = get_matching_microcode(new_mc, cpu);
if (error < 0)
goto out;
if (error == 1)
@@ -486,131 +229,8 @@ MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
#define microcode_dev_exit() do { } while(0)
#endif

-static long get_next_ucode_from_buffer(void **mc, const u8 *buf,
- unsigned long size, long offset)
-{
- struct microcode_header *mc_header;
- unsigned long total_size;
-
- /* No more data */
- if (offset >= size)
- return 0;
- mc_header = (struct microcode_header *)(buf + offset);
- total_size = get_totalsize(mc_header);
-
- if (offset + total_size > size) {
- printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
- return -EINVAL;
- }
-
- *mc = vmalloc(total_size);
- if (!*mc) {
- printk(KERN_ERR "microcode: error! Can not allocate memory\n");
- return -ENOMEM;
- }
- memcpy(*mc, buf + offset, total_size);
- return offset + total_size;
-}
-
/* fake device for request_firmware */
-static struct platform_device *microcode_pdev;
-
-static int cpu_request_microcode(int cpu)
-{
- char name[30];
- struct cpuinfo_x86 *c = &cpu_data(cpu);
- const struct firmware *firmware;
- const u8 *buf;
- unsigned long size;
- long offset = 0;
- int error;
- void *mc;
-
- /* We should bind the task to the CPU */
- BUG_ON(cpu != raw_smp_processor_id());
- sprintf(name,"intel-ucode/%02x-%02x-%02x",
- c->x86, c->x86_model, c->x86_mask);
- error = request_firmware(&firmware, name, &microcode_pdev->dev);
- if (error) {
- pr_debug("microcode: data file %s load failed\n", name);
- return error;
- }
- buf = firmware->data;
- size = firmware->size;
- while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
- > 0) {
- error = microcode_sanity_check(mc);
- if (error)
- break;
- error = get_maching_microcode(mc, cpu);
- if (error < 0)
- break;
- /*
- * It's possible the data file has multiple matching ucode,
- * lets keep searching till the latest version
- */
- if (error == 1) {
- apply_microcode(cpu);
- error = 0;
- }
- vfree(mc);
- }
- if (offset > 0)
- vfree(mc);
- if (offset < 0)
- error = offset;
- release_firmware(firmware);
-
- return error;
-}
-
-static int apply_microcode_check_cpu(int cpu)
-{
- struct cpuinfo_x86 *c = &cpu_data(cpu);
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- cpumask_t old;
- unsigned int val[2];
- int err = 0;
-
- /* Check if the microcode is available */
- if (!uci->mc)
- return 0;
-
- old = current->cpus_allowed;
- set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
-
- /* Check if the microcode we have in memory matches the CPU */
- if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
- cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001))
- err = -EINVAL;
-
- if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) {
- /* get processor flags from MSR 0x17 */
- rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
- if (uci->pf != (1 << ((val[1] >> 18) & 7)))
- err = -EINVAL;
- }
-
- if (!err) {
- wrmsr(MSR_IA32_UCODE_REV, 0, 0);
- /* see notes above for revision 1.07. Apparent chip bug */
- sync_core();
- /* get the current revision from MSR 0x8B */
- rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
- if (uci->rev != val[1])
- err = -EINVAL;
- }
-
- if (!err)
- apply_microcode(cpu);
- else
- printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:"
- " sig=0x%x, pf=0x%x, rev=0x%x\n",
- cpu, uci->sig, uci->pf, uci->rev);
-
- set_cpus_allowed_ptr(current, &old);
- return err;
-}
+struct platform_device *microcode_pdev;

static void microcode_init_cpu(int cpu, int resume)
{
@@ -628,17 +248,6 @@ static void microcode_init_cpu(int cpu, int resume)
set_cpus_allowed_ptr(current, &old);
}

-static void microcode_fini_cpu(int cpu)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
- mutex_lock(&microcode_mutex);
- uci->valid = 0;
- vfree(uci->mc);
- uci->mc = NULL;
- mutex_unlock(&microcode_mutex);
-}
-
static ssize_t reload_store(struct sys_device *dev, const char *buf, size_t sz)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
new file mode 100644
index 0000000..a30c799
--- /dev/null
+++ b/arch/x86/kernel/microcode_intel.c
@@ -0,0 +1,513 @@
+/*
+ * Intel CPU Microcode Update Driver for Linux
+ *
+ * Copyright (C) 2000-2006 Tigran Aivazian <[email protected]>
+ * 2006 Shaohua Li <[email protected]>
+ *
+ * This driver allows to upgrade microcode on Intel processors
+ * belonging to IA-32 family - PentiumPro, Pentium II,
+ * Pentium III, Xeon, Pentium 4, etc.
+ *
+ * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture
+ * Software Developer's Manual
+ * Order Number 253668 or free download from:
+ *
+ * http://developer.intel.com/design/pentium4/manuals/253668.htm
+ *
+ * For more information, go to http://www.urbanmyth.org/microcode
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * 1.0 16 Feb 2000, Tigran Aivazian <[email protected]>
+ * Initial release.
+ * 1.01 18 Feb 2000, Tigran Aivazian <[email protected]>
+ * Added read() support + cleanups.
+ * 1.02 21 Feb 2000, Tigran Aivazian <[email protected]>
+ * Added 'device trimming' support. open(O_WRONLY) zeroes
+ * and frees the saved copy of applied microcode.
+ * 1.03 29 Feb 2000, Tigran Aivazian <[email protected]>
+ * Made to use devfs (/dev/cpu/microcode) + cleanups.
+ * 1.04 06 Jun 2000, Simon Trimmer <[email protected]>
+ * Added misc device support (now uses both devfs and misc).
+ * Added MICROCODE_IOCFREE ioctl to clear memory.
+ * 1.05 09 Jun 2000, Simon Trimmer <[email protected]>
+ * Messages for error cases (non Intel & no suitable microcode).
+ * 1.06 03 Aug 2000, Tigran Aivazian <[email protected]>
+ * Removed ->release(). Removed exclusive open and status bitmap.
+ * Added microcode_rwsem to serialize read()/write()/ioctl().
+ * Removed global kernel lock usage.
+ * 1.07 07 Sep 2000, Tigran Aivazian <[email protected]>
+ * Write 0 to 0x8B msr and then cpuid before reading revision,
+ * so that it works even if there were no update done by the
+ * BIOS. Otherwise, reading from 0x8B gives junk (which happened
+ * to be 0 on my machine which is why it worked even when I
+ * disabled update by the BIOS)
+ * Thanks to Eric W. Biederman <[email protected]> for the fix.
+ * 1.08 11 Dec 2000, Richard Schaal <[email protected]> and
+ * Tigran Aivazian <[email protected]>
+ * Intel Pentium 4 processor support and bugfixes.
+ * 1.09 30 Oct 2001, Tigran Aivazian <[email protected]>
+ * Bugfix for HT (Hyper-Threading) enabled processors
+ * whereby processor resources are shared by all logical processors
+ * in a single CPU package.
+ * 1.10 28 Feb 2002 Asit K Mallick <[email protected]> and
+ * Tigran Aivazian <[email protected]>,
+ * Serialize updates as required on HT processors due to speculative
+ * nature of implementation.
+ * 1.11 22 Mar 2002 Tigran Aivazian <[email protected]>
+ * Fix the panic when writing zero-length microcode chunk.
+ * 1.12 29 Sep 2003 Nitin Kamble <[email protected]>,
+ * Jun Nakajima <[email protected]>
+ * Support for the microcode updates in the new format.
+ * 1.13 10 Oct 2003 Tigran Aivazian <[email protected]>
+ * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
+ * because we no longer hold a copy of applied microcode
+ * in kernel memory.
+ * 1.14 25 Jun 2004 Tigran Aivazian <[email protected]>
+ * Fix sigmatch() macro to handle old CPUs with pf == 0.
+ * Thanks to Stuart Swales for pointing out this bug.
+ */
+
+//#define DEBUG /* pr_debug */
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.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 <asm/msr.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include <asm/microcode.h>
+
+MODULE_DESCRIPTION("Microcode Update Driver");
+MODULE_AUTHOR("Tigran Aivazian <[email protected]>");
+MODULE_LICENSE("GPL");
+
+#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
+#define MC_HEADER_SIZE (sizeof(struct microcode_header)) /* 48 bytes */
+#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
+#define EXT_HEADER_SIZE (sizeof(struct extended_sigtable)) /* 20 bytes */
+#define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature)) /* 12 bytes */
+#define DWSIZE (sizeof(u32))
+#define get_totalsize(mc) \
+ (((struct microcode *)mc)->hdr.totalsize ? \
+ ((struct microcode *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
+#define get_datasize(mc) \
+ (((struct microcode *)mc)->hdr.datasize ? \
+ ((struct microcode *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
+
+#define sigmatch(s1, s2, p1, p2) \
+ (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
+
+#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
+
+/* serialize access to the physical write to MSR 0x79 */
+static DEFINE_SPINLOCK(microcode_update_lock);
+
+/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
+extern struct mutex microcode_mutex;
+
+extern struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
+
+void collect_cpu_info(int cpu_num)
+{
+ struct cpuinfo_x86 *c = &cpu_data(cpu_num);
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+ unsigned int val[2];
+
+ /* We should bind the task to the CPU */
+ BUG_ON(raw_smp_processor_id() != cpu_num);
+ uci->pf = uci->rev = 0;
+ uci->mc = NULL;
+ uci->valid = 1;
+
+ if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
+ cpu_has(c, X86_FEATURE_IA64)) {
+ printk(KERN_ERR "microcode: CPU%d not a capable Intel "
+ "processor\n", cpu_num);
+ uci->valid = 0;
+ return;
+ }
+
+ uci->sig = cpuid_eax(0x00000001);
+
+ if ((c->x86_model >= 5) || (c->x86 > 6)) {
+ /* get processor flags from MSR 0x17 */
+ rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
+ uci->pf = 1 << ((val[1] >> 18) & 7);
+ }
+
+ wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+ /* see notes above for revision 1.07. Apparent chip bug */
+ sync_core();
+ /* get the current revision from MSR 0x8B */
+ rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
+ pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
+ uci->sig, uci->pf, uci->rev);
+}
+
+static inline int microcode_update_match(int cpu_num,
+ struct microcode_header *mc_header, int sig, int pf)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+
+ if (!sigmatch(sig, uci->sig, pf, uci->pf)
+ || mc_header->rev <= uci->rev)
+ return 0;
+ return 1;
+}
+
+int microcode_sanity_check(void *mc)
+{
+ struct microcode_header *mc_header = mc;
+ struct extended_sigtable *ext_header = NULL;
+ struct extended_signature *ext_sig;
+ unsigned long total_size, data_size, ext_table_size;
+ int sum, orig_sum, ext_sigcount = 0, i;
+
+ total_size = get_totalsize(mc_header);
+ data_size = get_datasize(mc_header);
+ if (data_size + MC_HEADER_SIZE > total_size) {
+ printk(KERN_ERR "microcode: error! "
+ "Bad data size in microcode data file\n");
+ return -EINVAL;
+ }
+
+ if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
+ printk(KERN_ERR "microcode: error! "
+ "Unknown microcode update format\n");
+ return -EINVAL;
+ }
+ ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
+ if (ext_table_size) {
+ if ((ext_table_size < EXT_HEADER_SIZE)
+ || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
+ printk(KERN_ERR "microcode: error! "
+ "Small exttable size in microcode data file\n");
+ return -EINVAL;
+ }
+ ext_header = mc + MC_HEADER_SIZE + data_size;
+ if (ext_table_size != exttable_size(ext_header)) {
+ printk(KERN_ERR "microcode: error! "
+ "Bad exttable size in microcode data file\n");
+ return -EFAULT;
+ }
+ ext_sigcount = ext_header->count;
+ }
+
+ /* check extended table checksum */
+ if (ext_table_size) {
+ int ext_table_sum = 0;
+ int *ext_tablep = (int *)ext_header;
+
+ i = ext_table_size / DWSIZE;
+ while (i--)
+ ext_table_sum += ext_tablep[i];
+ if (ext_table_sum) {
+ printk(KERN_WARNING "microcode: aborting, "
+ "bad extended signature table checksum\n");
+ return -EINVAL;
+ }
+ }
+
+ /* calculate the checksum */
+ orig_sum = 0;
+ i = (MC_HEADER_SIZE + data_size) / DWSIZE;
+ while (i--)
+ orig_sum += ((int *)mc)[i];
+ if (orig_sum) {
+ printk(KERN_ERR "microcode: aborting, bad checksum\n");
+ return -EINVAL;
+ }
+ if (!ext_table_size)
+ return 0;
+ /* check extended signature checksum */
+ for (i = 0; i < ext_sigcount; i++) {
+ ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
+ EXT_SIGNATURE_SIZE * i;
+ sum = orig_sum
+ - (mc_header->sig + mc_header->pf + mc_header->cksum)
+ + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
+ if (sum) {
+ printk(KERN_ERR "microcode: aborting, bad checksum\n");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/*
+ * return 0 - no update found
+ * return 1 - found update
+ * return < 0 - error
+ */
+int get_matching_microcode(void *mc, int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ struct microcode_header *mc_header = mc;
+ struct extended_sigtable *ext_header;
+ unsigned long total_size = get_totalsize(mc_header);
+ int ext_sigcount, i;
+ struct extended_signature *ext_sig;
+ void *new_mc;
+
+ if (microcode_update_match(cpu, mc_header,
+ mc_header->sig, mc_header->pf))
+ goto find;
+
+ if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
+ return 0;
+
+ ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
+ ext_sigcount = ext_header->count;
+ ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
+ for (i = 0; i < ext_sigcount; i++) {
+ if (microcode_update_match(cpu, mc_header,
+ ext_sig->sig, ext_sig->pf))
+ goto find;
+ ext_sig++;
+ }
+ return 0;
+find:
+ pr_debug("microcode: CPU%d found a matching microcode update with"
+ " version 0x%x (current=0x%x)\n", cpu, mc_header->rev, uci->rev);
+ new_mc = vmalloc(total_size);
+ if (!new_mc) {
+ printk(KERN_ERR "microcode: error! Can not allocate memory\n");
+ return -ENOMEM;
+ }
+
+ /* free previous update file */
+ vfree(uci->mc);
+
+ memcpy(new_mc, mc, total_size);
+ uci->mc = new_mc;
+ return 1;
+}
+
+void apply_microcode(int cpu)
+{
+ unsigned long flags;
+ unsigned int val[2];
+ int cpu_num = raw_smp_processor_id();
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+
+ /* We should bind the task to the CPU */
+ BUG_ON(cpu_num != cpu);
+
+ if (uci->mc == NULL)
+ return;
+
+ /* serialize access to the physical write to MSR 0x79 */
+ spin_lock_irqsave(&microcode_update_lock, flags);
+
+ /* write microcode via MSR 0x79 */
+ wrmsr(MSR_IA32_UCODE_WRITE,
+ (unsigned long) uci->mc->bits,
+ (unsigned long) uci->mc->bits >> 16 >> 16);
+ wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+
+ /* see notes above for revision 1.07. Apparent chip bug */
+ sync_core();
+
+ /* get the current revision from MSR 0x8B */
+ rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
+
+ spin_unlock_irqrestore(&microcode_update_lock, flags);
+ if (val[1] != uci->mc->hdr.rev) {
+ printk(KERN_ERR "microcode: CPU%d update from revision "
+ "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
+ return;
+ }
+ printk(KERN_INFO "microcode: CPU%d updated from revision "
+ "0x%x to 0x%x, date = %08x \n",
+ cpu_num, uci->rev, val[1], uci->mc->hdr.date);
+ uci->rev = val[1];
+}
+
+#ifdef CONFIG_MICROCODE_OLD_INTERFACE
+extern void __user *user_buffer; /* user area microcode data buffer */
+extern unsigned int user_buffer_size; /* it's size */
+
+long get_next_ucode(void **mc, long offset)
+{
+ struct microcode_header mc_header;
+ unsigned long total_size;
+
+ /* No more data */
+ if (offset >= user_buffer_size)
+ return 0;
+ if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ return -EFAULT;
+ }
+ total_size = get_totalsize(&mc_header);
+ if (offset + total_size > user_buffer_size) {
+ printk(KERN_ERR "microcode: error! Bad total size in microcode "
+ "data file\n");
+ return -EINVAL;
+ }
+ *mc = vmalloc(total_size);
+ if (!*mc)
+ return -ENOMEM;
+ if (copy_from_user(*mc, user_buffer + offset, total_size)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ vfree(*mc);
+ return -EFAULT;
+ }
+ return offset + total_size;
+}
+#endif
+
+static long get_next_ucode_from_buffer(void **mc, const u8 *buf,
+ unsigned long size, long offset)
+{
+ struct microcode_header *mc_header;
+ unsigned long total_size;
+
+ /* No more data */
+ if (offset >= size)
+ return 0;
+ mc_header = (struct microcode_header *)(buf + offset);
+ total_size = get_totalsize(mc_header);
+
+ if (offset + total_size > size) {
+ printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
+ return -EINVAL;
+ }
+
+ *mc = vmalloc(total_size);
+ if (!*mc) {
+ printk(KERN_ERR "microcode: error! Can not allocate memory\n");
+ return -ENOMEM;
+ }
+ memcpy(*mc, buf + offset, total_size);
+ return offset + total_size;
+}
+
+/* fake device for request_firmware */
+extern struct platform_device *microcode_pdev;
+
+int cpu_request_microcode(int cpu)
+{
+ char name[30];
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ const struct firmware *firmware;
+ const u8 *buf;
+ unsigned long size;
+ long offset = 0;
+ int error;
+ void *mc;
+
+ /* We should bind the task to the CPU */
+ BUG_ON(cpu != raw_smp_processor_id());
+ sprintf(name, "intel-ucode/%02x-%02x-%02x",
+ c->x86, c->x86_model, c->x86_mask);
+ error = request_firmware(&firmware, name, &microcode_pdev->dev);
+ if (error) {
+ pr_debug("microcode: data file %s load failed\n", name);
+ return error;
+ }
+ buf = firmware->data;
+ size = firmware->size;
+ while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
+ > 0) {
+ error = microcode_sanity_check(mc);
+ if (error)
+ break;
+ error = get_matching_microcode(mc, cpu);
+ if (error < 0)
+ break;
+ /*
+ * It's possible the data file has multiple matching ucode,
+ * lets keep searching till the latest version
+ */
+ if (error == 1) {
+ apply_microcode(cpu);
+ error = 0;
+ }
+ vfree(mc);
+ }
+ if (offset > 0)
+ vfree(mc);
+ if (offset < 0)
+ error = offset;
+ release_firmware(firmware);
+
+ return error;
+}
+
+int apply_microcode_check_cpu(int cpu)
+{
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ cpumask_t old;
+ unsigned int val[2];
+ int err = 0;
+
+ /* Check if the microcode is available */
+ if (!uci->mc)
+ return 0;
+
+ old = current->cpus_allowed;
+ set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
+
+ /* Check if the microcode we have in memory matches the CPU */
+ if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
+ cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001))
+ err = -EINVAL;
+
+ if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) {
+ /* get processor flags from MSR 0x17 */
+ rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
+ if (uci->pf != (1 << ((val[1] >> 18) & 7)))
+ err = -EINVAL;
+ }
+
+ if (!err) {
+ wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+ /* see notes above for revision 1.07. Apparent chip bug */
+ sync_core();
+ /* get the current revision from MSR 0x8B */
+ rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
+ if (uci->rev != val[1])
+ err = -EINVAL;
+ }
+
+ if (!err)
+ apply_microcode(cpu);
+ else
+ printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:"
+ " sig=0x%x, pf=0x%x, rev=0x%x\n",
+ cpu, uci->sig, uci->pf, uci->rev);
+
+ set_cpus_allowed_ptr(current, &old);
+ return err;
+}
+
+void microcode_fini_cpu(int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ mutex_lock(&microcode_mutex);
+ uci->valid = 0;
+ kfree(uci->mc);
+ uci->mc = NULL;
+ mutex_unlock(&microcode_mutex);
+}
--
1.5.4.5