1 files changed, 480 insertions, 0 deletions

diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
new file mode 100644
index 000000000000..622dc4a21784
--- /dev/null
+++ b/arch/x86/kernel/microcode_intel.c
@@ -0,0 +1,480 @@
+/*
+ *      Intel CPU Microcode Update Driver for Linux
+ *
+ *      Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
+ *                    2006      Shaohua Li <shaohua.li@intel.com>
+ *
+ *      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 <tigran@sco.com>
+ *              Initial release.
+ *      1.01    18 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ *              Added read() support + cleanups.
+ *      1.02    21 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ *              Added 'device trimming' support. open(O_WRONLY) zeroes
+ *              and frees the saved copy of applied microcode.
+ *      1.03    29 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ *              Made to use devfs (/dev/cpu/microcode) + cleanups.
+ *      1.04    06 Jun 2000, Simon Trimmer <simon@veritas.com>
+ *              Added misc device support (now uses both devfs and misc).
+ *              Added MICROCODE_IOCFREE ioctl to clear memory.
+ *      1.05    09 Jun 2000, Simon Trimmer <simon@veritas.com>
+ *              Messages for error cases (non Intel & no suitable microcode).
+ *      1.06    03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
+ *              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 <tigran@veritas.com>
+ *              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 <ebiederman@lnxi.com> for the fix.
+ *      1.08    11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
+ *                           Tigran Aivazian <tigran@veritas.com>
+ *              Intel Pentium 4 processor support and bugfixes.
+ *      1.09    30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
+ *              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 <asit.k.mallick@intel.com> and
+ *              Tigran Aivazian <tigran@veritas.com>,
+ *              Serialize updates as required on HT processors due to
+ *              speculative nature of implementation.
+ *      1.11    22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
+ *              Fix the panic when writing zero-length microcode chunk.
+ *      1.12    29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
+ *              Jun Nakajima <jun.nakajima@intel.com>
+ *              Support for the microcode updates in the new format.
+ *      1.13    10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
+ *              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 <tigran@veritas.com>
+ *              Fix sigmatch() macro to handle old CPUs with pf == 0.
+ *              Thanks to Stuart Swales for pointing out this bug.
+ */
+#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 <tigran@aivazian.fsnet.co.uk>");
+MODULE_LICENSE("GPL");
+
+struct microcode_header_intel {
+        unsigned int            hdrver;
+        unsigned int            rev;
+        unsigned int            date;
+        unsigned int            sig;
+        unsigned int            cksum;
+        unsigned int            ldrver;
+        unsigned int            pf;
+        unsigned int            datasize;
+        unsigned int            totalsize;
+        unsigned int            reserved[3];
+};
+
+struct microcode_intel {
+        struct microcode_header_intel hdr;
+        unsigned int            bits[0];
+};
+
+/* microcode format is extended from prescott processors */
+struct extended_signature {
+        unsigned int            sig;
+        unsigned int            pf;
+        unsigned int            cksum;
+};
+
+struct extended_sigtable {
+        unsigned int            count;
+        unsigned int            cksum;
+        unsigned int            reserved[3];
+        struct extended_signature sigs[0];
+};
+
+#define DEFAULT_UCODE_DATASIZE  (2000)
+#define MC_HEADER_SIZE          (sizeof(struct microcode_header_intel))
+#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
+#define EXT_HEADER_SIZE         (sizeof(struct extended_sigtable))
+#define EXT_SIGNATURE_SIZE      (sizeof(struct extended_signature))
+#define DWSIZE                  (sizeof(u32))
+#define get_totalsize(mc) \
+        (((struct microcode_intel *)mc)->hdr.totalsize ? \
+         ((struct microcode_intel *)mc)->hdr.totalsize : \
+         DEFAULT_UCODE_TOTALSIZE)
+
+#define get_datasize(mc) \
+        (((struct microcode_intel *)mc)->hdr.datasize ? \
+         ((struct microcode_intel *)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);
+
+static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
+{
+        struct cpuinfo_x86 *c = &cpu_data(cpu_num);
+        unsigned int val[2];
+
+        memset(csig, 0, sizeof(*csig));
+
+        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);
+                return -1;
+        }
+
+        csig->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]);
+                csig->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], csig->rev);
+        pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
+                        csig->sig, csig->pf, csig->rev);
+
+        return 0;
+}
+
+static inline int update_match_cpu(struct cpu_signature *csig, int sig, int pf)
+{
+        return (!sigmatch(sig, csig->sig, pf, csig->pf)) ? 0 : 1;
+}
+
+static inline int 
+update_match_revision(struct microcode_header_intel *mc_header, int rev)
+{
+        return (mc_header->rev <= rev) ? 0 : 1;
+}
+
+static int microcode_sanity_check(void *mc)
+{
+        struct microcode_header_intel *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
+ */
+static int
+get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
+{
+        struct microcode_header_intel *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;
+
+        if (!update_match_revision(mc_header, rev))
+                return 0;
+
+        if (update_match_cpu(cpu_sig, mc_header->sig, mc_header->pf))
+                return 1;
+
+        /* Look for ext. headers: */
+        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 (update_match_cpu(cpu_sig, ext_sig->sig, ext_sig->pf))
+                        return 1;
+                ext_sig++;
+        }
+        return 0;
+}
+
+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;
+        struct microcode_intel *mc_intel = uci->mc;
+
+        /* We should bind the task to the CPU */
+        BUG_ON(cpu_num != cpu);
+
+        if (mc_intel == 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) mc_intel->bits,
+              (unsigned long) mc_intel->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] != mc_intel->hdr.rev) {
+                printk(KERN_ERR "microcode: CPU%d update from revision "
+                        "0x%x to 0x%x failed\n", cpu_num, uci->cpu_sig.rev, val[1]);
+                return;
+        }
+        printk(KERN_INFO "microcode: CPU%d updated from revision "
+               "0x%x to 0x%x, date = %04x-%02x-%02x \n",
+                cpu_num, uci->cpu_sig.rev, val[1],
+                mc_intel->hdr.date & 0xffff,
+                mc_intel->hdr.date >> 24,
+                (mc_intel->hdr.date >> 16) & 0xff);
+        uci->cpu_sig.rev = val[1];
+}
+
+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 = size;
+
+        while (leftover) {
+                struct microcode_header_intel mc_header;
+                unsigned int mc_size;
+
+                if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
+                        break;
+
+                mc_size = get_totalsize(&mc_header);
+                if (!mc_size || mc_size > leftover) {
+                        printk(KERN_ERR "microcode: error!"
+                                        "Bad data in microcode data file\n");
+                        break;
+                }
+
+                mc = vmalloc(mc_size);
+                if (!mc)
+                        break;
+
+                if (get_ucode_data(mc, ucode_ptr, mc_size) ||
+                    microcode_sanity_check(mc) < 0) {
+                        vfree(mc);
+                        break;
+                }
+
+                if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
+                        if (new_mc)
+                                vfree(new_mc);
+                        new_rev = mc_header.rev;
+                        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 = (struct microcode_intel *)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);
+        }
+
+        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)
+{
+        char name[30];
+        struct cpuinfo_x86 *c = &cpu_data(cpu);
+        const struct firmware *firmware;
+        int ret;
+
+        /* 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);
+        ret = request_firmware(&firmware, name, device);
+        if (ret) {
+                pr_debug("microcode: data file %s load failed\n", name);
+                return ret;
+        }
+
+        ret = generic_load_microcode(cpu, (void*)firmware->data, firmware->size,
+                        &get_ucode_fw);
+
+        release_firmware(firmware);
+
+        return ret;
+}
+
+static int get_ucode_user(void *to, const void *from, size_t n)
+{
+        return copy_from_user(to, from, n);
+}
+
+static int request_microcode_user(int cpu, const void __user *buf, size_t size)
+{
+        /* We should bind the task to the CPU */
+        BUG_ON(cpu != raw_smp_processor_id());
+
+        return generic_load_microcode(cpu, (void*)buf, size, &get_ucode_user);
+}
+
+static void microcode_fini_cpu(int cpu)
+{
+        struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+        vfree(uci->mc);
+        uci->mc = NULL;
+}
+
+struct microcode_ops microcode_intel_ops = {
+        .request_microcode_user           = request_microcode_user,
+        .request_microcode_fw             = request_microcode_fw,
+        .collect_cpu_info                 = collect_cpu_info,
+        .apply_microcode                  = apply_microcode,
+        .microcode_fini_cpu               = microcode_fini_cpu,
+};
+
+struct microcode_ops * __init init_intel_microcode(void)
+{
+        return &microcode_intel_ops;
+}
+