diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/microcode.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c index 00bdc3dd693e..f8f1ec5f26c1 100644 --- a/arch/i386/kernel/microcode.c +++ b/arch/i386/kernel/microcode.c @@ -83,6 +83,9 @@ #include <linux/spinlock.h> #include <linux/mm.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> @@ -493,6 +496,112 @@ MODULE_ALIAS_MISCDEV(MICROCODE_MINOR); #define microcode_dev_exit() do { } while(0) #endif +static long get_next_ucode_from_buffer(void **mc, void *buf, + unsigned long size, long offset) +{ + microcode_header_t *mc_header; + unsigned long total_size; + + /* No more data */ + if (offset >= size) + return 0; + mc_header = (microcode_header_t *)(buf + offset); + total_size = get_totalsize(mc_header); + + if ((offset + total_size > size) + || (total_size < DEFAULT_UCODE_TOTALSIZE)) { + 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; + void * 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, µcode_pdev->dev); + if (error) { + pr_debug("ucode data file %s load failed\n", name); + return error; + } + buf = (void *)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 void microcode_init_cpu(int cpu) +{ + cpumask_t old; + struct ucode_cpu_info *uci = ucode_cpu_info + cpu; + + old = current->cpus_allowed; + + set_cpus_allowed(current, cpumask_of_cpu(cpu)); + mutex_lock(µcode_mutex); + collect_cpu_info(cpu); + if (uci->valid) + cpu_request_microcode(cpu); + mutex_unlock(µcode_mutex); + set_cpus_allowed(current, old); +} + +static void microcode_fini_cpu(int cpu) +{ + struct ucode_cpu_info *uci = ucode_cpu_info + cpu; + + mutex_lock(µcode_mutex); + uci->valid = 0; + vfree(uci->mc); + uci->mc = NULL; + mutex_unlock(µcode_mutex); +} + static int __init microcode_init (void) { int error; @@ -500,6 +609,12 @@ static int __init microcode_init (void) error = microcode_dev_init(); if (error) return error; + microcode_pdev = platform_device_register_simple("microcode", -1, + NULL, 0); + if (IS_ERR(microcode_pdev)) { + microcode_dev_exit(); + return PTR_ERR(microcode_pdev); + } printk(KERN_INFO "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@veritas.com>\n"); @@ -509,6 +624,7 @@ static int __init microcode_init (void) static void __exit microcode_exit (void) { microcode_dev_exit(); + platform_device_unregister(microcode_pdev); } module_init(microcode_init) |