From a30a6a2cb0fdc2c9701d6ddfb21affeb8146c038 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Wed, 27 Sep 2006 01:50:52 -0700 Subject: [PATCH] [PATCH] x86 microcode: using request_firmware to pull microcode Using request_firmware to pull ucode from userspace, so we don't need the application 'microcode_ctl' to assist. We name each ucode file according to CPU's info as intel-ucode/family-model-stepping. In this way we could split ucode file as small one. This has a lot of advantages such as selectively update and validate microcode for specific models, better manage microcode file, easily write tools for administerators and so on. with the changes, we should put all intel-ucode/xx-xx-xx microcode files into the firmware dir (I had a tool to split previous big data file into small one and later we will release new style data file). The init script should be changed to just loading the driver without unloading Signed-off-by: Shaohua Li Acked-by: Tigran Aivazian Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/microcode.c | 116 ++++++++++++++++++++++++++++++++++ drivers/base/firmware_class.c | 2 +- 2 files changed, 117 insertions(+), 1 deletion(-) 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 #include #include +#include +#include +#include #include #include @@ -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 " \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) diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 5d6c011183f5..77bf8826e2f9 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -602,7 +602,7 @@ firmware_class_exit(void) class_unregister(&firmware_class); } -module_init(firmware_class_init); +fs_initcall(firmware_class_init); module_exit(firmware_class_exit); EXPORT_SYMBOL(release_firmware); -- 2.20.1