Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, microcode: Simplify vfree() use x86: microcode: use smp_call_function_single instead of set_cpus_allowed, cleanup of synchronization logic
This commit is contained in:
Linus Torvalds
Коммит
48c72d1ab4
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@ -9,20 +9,31 @@ struct cpu_signature {
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struct device;
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enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
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struct microcode_ops {
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int (*request_microcode_user) (int cpu, const void __user *buf, size_t size);
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int (*request_microcode_fw) (int cpu, struct device *device);
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enum ucode_state (*request_microcode_user) (int cpu,
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const void __user *buf, size_t size);
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void (*apply_microcode) (int cpu);
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enum ucode_state (*request_microcode_fw) (int cpu,
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struct device *device);
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int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
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void (*microcode_fini_cpu) (int cpu);
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/*
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* The generic 'microcode_core' part guarantees that
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* the callbacks below run on a target cpu when they
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* are being called.
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* See also the "Synchronization" section in microcode_core.c.
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*/
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int (*apply_microcode) (int cpu);
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int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
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};
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struct ucode_cpu_info {
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struct cpu_signature cpu_sig;
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int valid;
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void *mc;
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struct cpu_signature cpu_sig;
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int valid;
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void *mc;
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};
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extern struct ucode_cpu_info ucode_cpu_info[];
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@ -13,25 +13,13 @@
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* Licensed under the terms of the GNU General Public
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* License version 2. See file COPYING for details.
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*/
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#include <linux/platform_device.h>
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#include <linux/capability.h>
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#include <linux/miscdevice.h>
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#include <linux/firmware.h>
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#include <linux/spinlock.h>
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#include <linux/cpumask.h>
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#include <linux/pci_ids.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/pci.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <asm/microcode.h>
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#include <asm/processor.h>
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@ -79,9 +67,6 @@ struct microcode_amd {
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#define UCODE_CONTAINER_SECTION_HDR 8
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#define UCODE_CONTAINER_HEADER_SIZE 12
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/* serialize access to the physical write */
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static DEFINE_SPINLOCK(microcode_update_lock);
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static struct equiv_cpu_entry *equiv_cpu_table;
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static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
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@ -144,9 +129,8 @@ static int get_matching_microcode(int cpu, void *mc, int rev)
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return 1;
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}
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static void apply_microcode_amd(int cpu)
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static int apply_microcode_amd(int cpu)
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{
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unsigned long flags;
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u32 rev, dummy;
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int cpu_num = raw_smp_processor_id();
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
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@ -156,25 +140,25 @@ static void apply_microcode_amd(int cpu)
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BUG_ON(cpu_num != cpu);
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if (mc_amd == NULL)
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return;
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return 0;
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spin_lock_irqsave(µcode_update_lock, flags);
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wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
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/* get patch id after patching */
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rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
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spin_unlock_irqrestore(µcode_update_lock, flags);
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/* check current patch id and patch's id for match */
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if (rev != mc_amd->hdr.patch_id) {
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printk(KERN_ERR "microcode: CPU%d: update failed "
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"(for patch_level=0x%x)\n", cpu, mc_amd->hdr.patch_id);
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return;
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return -1;
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}
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printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
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cpu, rev);
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uci->cpu_sig.rev = rev;
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return 0;
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}
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static int get_ucode_data(void *to, const u8 *from, size_t n)
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@ -257,13 +241,12 @@ static int install_equiv_cpu_table(const u8 *buf)
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static void free_equiv_cpu_table(void)
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{
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if (equiv_cpu_table) {
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vfree(equiv_cpu_table);
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equiv_cpu_table = NULL;
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}
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vfree(equiv_cpu_table);
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equiv_cpu_table = NULL;
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}
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static int generic_load_microcode(int cpu, const u8 *data, size_t size)
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static enum ucode_state
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generic_load_microcode(int cpu, const u8 *data, size_t size)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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const u8 *ucode_ptr = data;
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@ -272,12 +255,13 @@ static int generic_load_microcode(int cpu, const u8 *data, size_t size)
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int new_rev = uci->cpu_sig.rev;
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unsigned int leftover;
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unsigned long offset;
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enum ucode_state state = UCODE_OK;
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offset = install_equiv_cpu_table(ucode_ptr);
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if (!offset) {
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printk(KERN_ERR "microcode: failed to create "
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"equivalent cpu table\n");
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return -EINVAL;
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return UCODE_ERROR;
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}
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ucode_ptr += offset;
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@ -293,8 +277,7 @@ static int generic_load_microcode(int cpu, const u8 *data, size_t size)
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mc_header = (struct microcode_header_amd *)mc;
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if (get_matching_microcode(cpu, mc, new_rev)) {
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if (new_mc)
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vfree(new_mc);
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vfree(new_mc);
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new_rev = mc_header->patch_id;
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new_mc = mc;
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} else
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@ -306,34 +289,32 @@ static int generic_load_microcode(int cpu, const u8 *data, size_t size)
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if (new_mc) {
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if (!leftover) {
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if (uci->mc)
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vfree(uci->mc);
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vfree(uci->mc);
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uci->mc = new_mc;
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pr_debug("microcode: CPU%d found a matching microcode "
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"update with version 0x%x (current=0x%x)\n",
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cpu, new_rev, uci->cpu_sig.rev);
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} else
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} else {
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vfree(new_mc);
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}
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state = UCODE_ERROR;
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}
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} else
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state = UCODE_NFOUND;
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free_equiv_cpu_table();
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return (int)leftover;
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return state;
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}
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static int request_microcode_fw(int cpu, struct device *device)
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static enum ucode_state request_microcode_fw(int cpu, struct device *device)
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{
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const char *fw_name = "amd-ucode/microcode_amd.bin";
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const struct firmware *firmware;
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int ret;
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enum ucode_state ret;
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/* We should bind the task to the CPU */
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BUG_ON(cpu != raw_smp_processor_id());
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ret = request_firmware(&firmware, fw_name, device);
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if (ret) {
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if (request_firmware(&firmware, fw_name, device)) {
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printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
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return ret;
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return UCODE_NFOUND;
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}
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ret = generic_load_microcode(cpu, firmware->data, firmware->size);
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@ -343,11 +324,12 @@ static int request_microcode_fw(int cpu, struct device *device)
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return ret;
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}
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static int request_microcode_user(int cpu, const void __user *buf, size_t size)
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static enum ucode_state
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request_microcode_user(int cpu, const void __user *buf, size_t size)
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{
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printk(KERN_INFO "microcode: AMD microcode update via "
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"/dev/cpu/microcode not supported\n");
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return -1;
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return UCODE_ERROR;
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}
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static void microcode_fini_cpu_amd(int cpu)
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@ -71,27 +71,18 @@
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* Thanks to Stuart Swales for pointing out this bug.
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*/
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#include <linux/platform_device.h>
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#include <linux/capability.h>
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#include <linux/miscdevice.h>
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#include <linux/firmware.h>
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#include <linux/capability.h>
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#include <linux/smp_lock.h>
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#include <linux/spinlock.h>
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#include <linux/cpumask.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <asm/microcode.h>
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#include <asm/processor.h>
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#include <asm/msr.h>
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MODULE_DESCRIPTION("Microcode Update Driver");
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MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
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@ -101,36 +92,110 @@ MODULE_LICENSE("GPL");
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static struct microcode_ops *microcode_ops;
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/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
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/*
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* Synchronization.
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*
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* All non cpu-hotplug-callback call sites use:
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*
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* - microcode_mutex to synchronize with each other;
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* - get/put_online_cpus() to synchronize with
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* the cpu-hotplug-callback call sites.
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*
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* We guarantee that only a single cpu is being
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* updated at any particular moment of time.
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*/
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static DEFINE_MUTEX(microcode_mutex);
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struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
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EXPORT_SYMBOL_GPL(ucode_cpu_info);
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/*
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* Operations that are run on a target cpu:
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*/
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struct cpu_info_ctx {
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struct cpu_signature *cpu_sig;
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int err;
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};
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static void collect_cpu_info_local(void *arg)
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{
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struct cpu_info_ctx *ctx = arg;
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ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
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ctx->cpu_sig);
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}
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static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
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{
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struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
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int ret;
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ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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return ret;
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}
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static int collect_cpu_info(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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int ret;
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memset(uci, 0, sizeof(*uci));
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ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
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if (!ret)
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uci->valid = 1;
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return ret;
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}
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struct apply_microcode_ctx {
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int err;
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};
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static void apply_microcode_local(void *arg)
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{
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struct apply_microcode_ctx *ctx = arg;
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ctx->err = microcode_ops->apply_microcode(smp_processor_id());
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}
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static int apply_microcode_on_target(int cpu)
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{
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struct apply_microcode_ctx ctx = { .err = 0 };
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int ret;
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|
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ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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|
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return ret;
|
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}
|
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|
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#ifdef CONFIG_MICROCODE_OLD_INTERFACE
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static int do_microcode_update(const void __user *buf, size_t size)
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{
|
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cpumask_t old;
|
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int error = 0;
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int cpu;
|
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|
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old = current->cpus_allowed;
|
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|
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for_each_online_cpu(cpu) {
|
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
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enum ucode_state ustate;
|
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|
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if (!uci->valid)
|
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continue;
|
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|
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set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
|
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error = microcode_ops->request_microcode_user(cpu, buf, size);
|
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if (error < 0)
|
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goto out;
|
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if (!error)
|
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microcode_ops->apply_microcode(cpu);
|
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ustate = microcode_ops->request_microcode_user(cpu, buf, size);
|
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if (ustate == UCODE_ERROR) {
|
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error = -1;
|
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break;
|
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} else if (ustate == UCODE_OK)
|
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apply_microcode_on_target(cpu);
|
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}
|
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out:
|
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set_cpus_allowed_ptr(current, &old);
|
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|
||||
return error;
|
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}
|
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|
||||
|
|
@ -143,19 +208,17 @@ static int microcode_open(struct inode *unused1, struct file *unused2)
|
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static ssize_t microcode_write(struct file *file, const char __user *buf,
|
||||
size_t len, loff_t *ppos)
|
||||
{
|
||||
ssize_t ret;
|
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ssize_t ret = -EINVAL;
|
||||
|
||||
if ((len >> PAGE_SHIFT) > num_physpages) {
|
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printk(KERN_ERR "microcode: too much data (max %ld pages)\n",
|
||||
num_physpages);
|
||||
return -EINVAL;
|
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pr_err("microcode: too much data (max %ld pages)\n", num_physpages);
|
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return ret;
|
||||
}
|
||||
|
||||
get_online_cpus();
|
||||
mutex_lock(µcode_mutex);
|
||||
|
||||
ret = do_microcode_update(buf, len);
|
||||
if (!ret)
|
||||
if (do_microcode_update(buf, len) == 0)
|
||||
ret = (ssize_t)len;
|
||||
|
||||
mutex_unlock(µcode_mutex);
|
||||
|
|
@ -165,15 +228,15 @@ static ssize_t microcode_write(struct file *file, const char __user *buf,
|
|||
}
|
||||
|
||||
static const struct file_operations microcode_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.write = microcode_write,
|
||||
.open = microcode_open,
|
||||
.owner = THIS_MODULE,
|
||||
.write = microcode_write,
|
||||
.open = microcode_open,
|
||||
};
|
||||
|
||||
static struct miscdevice microcode_dev = {
|
||||
.minor = MICROCODE_MINOR,
|
||||
.name = "microcode",
|
||||
.fops = µcode_fops,
|
||||
.minor = MICROCODE_MINOR,
|
||||
.name = "microcode",
|
||||
.fops = µcode_fops,
|
||||
};
|
||||
|
||||
static int __init microcode_dev_init(void)
|
||||
|
|
@ -182,9 +245,7 @@ static int __init microcode_dev_init(void)
|
|||
|
||||
error = misc_register(µcode_dev);
|
||||
if (error) {
|
||||
printk(KERN_ERR
|
||||
"microcode: can't misc_register on minor=%d\n",
|
||||
MICROCODE_MINOR);
|
||||
pr_err("microcode: can't misc_register on minor=%d\n", MICROCODE_MINOR);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
|
@ -205,42 +266,51 @@ MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
|
|||
/* fake device for request_firmware */
|
||||
static struct platform_device *microcode_pdev;
|
||||
|
||||
static long reload_for_cpu(void *unused)
|
||||
static int reload_for_cpu(int cpu)
|
||||
{
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + smp_processor_id();
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
int err = 0;
|
||||
|
||||
mutex_lock(µcode_mutex);
|
||||
if (uci->valid) {
|
||||
err = microcode_ops->request_microcode_fw(smp_processor_id(),
|
||||
µcode_pdev->dev);
|
||||
if (!err)
|
||||
microcode_ops->apply_microcode(smp_processor_id());
|
||||
enum ucode_state ustate;
|
||||
|
||||
ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev);
|
||||
if (ustate == UCODE_OK)
|
||||
apply_microcode_on_target(cpu);
|
||||
else
|
||||
if (ustate == UCODE_ERROR)
|
||||
err = -EINVAL;
|
||||
}
|
||||
mutex_unlock(µcode_mutex);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static ssize_t reload_store(struct sys_device *dev,
|
||||
struct sysdev_attribute *attr,
|
||||
const char *buf, size_t sz)
|
||||
const char *buf, size_t size)
|
||||
{
|
||||
char *end;
|
||||
unsigned long val = simple_strtoul(buf, &end, 0);
|
||||
int err = 0;
|
||||
unsigned long val;
|
||||
int cpu = dev->id;
|
||||
int ret = 0;
|
||||
char *end;
|
||||
|
||||
val = simple_strtoul(buf, &end, 0);
|
||||
if (end == buf)
|
||||
return -EINVAL;
|
||||
|
||||
if (val == 1) {
|
||||
get_online_cpus();
|
||||
if (cpu_online(cpu))
|
||||
err = work_on_cpu(cpu, reload_for_cpu, NULL);
|
||||
ret = reload_for_cpu(cpu);
|
||||
put_online_cpus();
|
||||
}
|
||||
if (err)
|
||||
return err;
|
||||
return sz;
|
||||
|
||||
if (!ret)
|
||||
ret = size;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t version_show(struct sys_device *dev,
|
||||
|
|
@ -271,11 +341,11 @@ static struct attribute *mc_default_attrs[] = {
|
|||
};
|
||||
|
||||
static struct attribute_group mc_attr_group = {
|
||||
.attrs = mc_default_attrs,
|
||||
.name = "microcode",
|
||||
.attrs = mc_default_attrs,
|
||||
.name = "microcode",
|
||||
};
|
||||
|
||||
static void __microcode_fini_cpu(int cpu)
|
||||
static void microcode_fini_cpu(int cpu)
|
||||
{
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
|
||||
|
|
@ -283,103 +353,68 @@ static void __microcode_fini_cpu(int cpu)
|
|||
uci->valid = 0;
|
||||
}
|
||||
|
||||
static void microcode_fini_cpu(int cpu)
|
||||
{
|
||||
mutex_lock(µcode_mutex);
|
||||
__microcode_fini_cpu(cpu);
|
||||
mutex_unlock(µcode_mutex);
|
||||
}
|
||||
|
||||
static void collect_cpu_info(int cpu)
|
||||
static enum ucode_state microcode_resume_cpu(int cpu)
|
||||
{
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
|
||||
memset(uci, 0, sizeof(*uci));
|
||||
if (!microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig))
|
||||
uci->valid = 1;
|
||||
}
|
||||
|
||||
static int microcode_resume_cpu(int cpu)
|
||||
{
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
struct cpu_signature nsig;
|
||||
|
||||
pr_debug("microcode: CPU%d resumed\n", cpu);
|
||||
|
||||
if (!uci->mc)
|
||||
return 1;
|
||||
return UCODE_NFOUND;
|
||||
|
||||
/*
|
||||
* Let's verify that the 'cached' ucode does belong
|
||||
* to this cpu (a bit of paranoia):
|
||||
*/
|
||||
if (microcode_ops->collect_cpu_info(cpu, &nsig)) {
|
||||
__microcode_fini_cpu(cpu);
|
||||
printk(KERN_ERR "failed to collect_cpu_info for resuming cpu #%d\n",
|
||||
cpu);
|
||||
return -1;
|
||||
}
|
||||
pr_debug("microcode: CPU%d updated upon resume\n", cpu);
|
||||
apply_microcode_on_target(cpu);
|
||||
|
||||
if ((nsig.sig != uci->cpu_sig.sig) || (nsig.pf != uci->cpu_sig.pf)) {
|
||||
__microcode_fini_cpu(cpu);
|
||||
printk(KERN_ERR "cached ucode doesn't match the resuming cpu #%d\n",
|
||||
cpu);
|
||||
/* Should we look for a new ucode here? */
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
return UCODE_OK;
|
||||
}
|
||||
|
||||
static long microcode_update_cpu(void *unused)
|
||||
static enum ucode_state microcode_init_cpu(int cpu)
|
||||
{
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + smp_processor_id();
|
||||
int err = 0;
|
||||
enum ucode_state ustate;
|
||||
|
||||
/*
|
||||
* Check if the system resume is in progress (uci->valid != NULL),
|
||||
* otherwise just request a firmware:
|
||||
*/
|
||||
if (uci->valid) {
|
||||
err = microcode_resume_cpu(smp_processor_id());
|
||||
} else {
|
||||
collect_cpu_info(smp_processor_id());
|
||||
if (uci->valid && system_state == SYSTEM_RUNNING)
|
||||
err = microcode_ops->request_microcode_fw(
|
||||
smp_processor_id(),
|
||||
µcode_pdev->dev);
|
||||
if (collect_cpu_info(cpu))
|
||||
return UCODE_ERROR;
|
||||
|
||||
/* --dimm. Trigger a delayed update? */
|
||||
if (system_state != SYSTEM_RUNNING)
|
||||
return UCODE_NFOUND;
|
||||
|
||||
ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev);
|
||||
|
||||
if (ustate == UCODE_OK) {
|
||||
pr_debug("microcode: CPU%d updated upon init\n", cpu);
|
||||
apply_microcode_on_target(cpu);
|
||||
}
|
||||
if (!err)
|
||||
microcode_ops->apply_microcode(smp_processor_id());
|
||||
return err;
|
||||
|
||||
return ustate;
|
||||
}
|
||||
|
||||
static int microcode_init_cpu(int cpu)
|
||||
static enum ucode_state microcode_update_cpu(int cpu)
|
||||
{
|
||||
int err;
|
||||
mutex_lock(µcode_mutex);
|
||||
err = work_on_cpu(cpu, microcode_update_cpu, NULL);
|
||||
mutex_unlock(µcode_mutex);
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
enum ucode_state ustate;
|
||||
|
||||
return err;
|
||||
if (uci->valid)
|
||||
ustate = microcode_resume_cpu(cpu);
|
||||
else
|
||||
ustate = microcode_init_cpu(cpu);
|
||||
|
||||
return ustate;
|
||||
}
|
||||
|
||||
static int mc_sysdev_add(struct sys_device *sys_dev)
|
||||
{
|
||||
int err, cpu = sys_dev->id;
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
|
||||
if (!cpu_online(cpu))
|
||||
return 0;
|
||||
|
||||
pr_debug("microcode: CPU%d added\n", cpu);
|
||||
memset(uci, 0, sizeof(*uci));
|
||||
|
||||
err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = microcode_init_cpu(cpu);
|
||||
if (microcode_init_cpu(cpu) == UCODE_ERROR)
|
||||
err = -EINVAL;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
|
@ -400,19 +435,30 @@ static int mc_sysdev_remove(struct sys_device *sys_dev)
|
|||
static int mc_sysdev_resume(struct sys_device *dev)
|
||||
{
|
||||
int cpu = dev->id;
|
||||
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
||||
|
||||
if (!cpu_online(cpu))
|
||||
return 0;
|
||||
|
||||
/* only CPU 0 will apply ucode here */
|
||||
microcode_update_cpu(NULL);
|
||||
/*
|
||||
* All non-bootup cpus are still disabled,
|
||||
* so only CPU 0 will apply ucode here.
|
||||
*
|
||||
* Moreover, there can be no concurrent
|
||||
* updates from any other places at this point.
|
||||
*/
|
||||
WARN_ON(cpu != 0);
|
||||
|
||||
if (uci->valid && uci->mc)
|
||||
microcode_ops->apply_microcode(cpu);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct sysdev_driver mc_sysdev_driver = {
|
||||
.add = mc_sysdev_add,
|
||||
.remove = mc_sysdev_remove,
|
||||
.resume = mc_sysdev_resume,
|
||||
.add = mc_sysdev_add,
|
||||
.remove = mc_sysdev_remove,
|
||||
.resume = mc_sysdev_resume,
|
||||
};
|
||||
|
||||
static __cpuinit int
|
||||
|
|
@ -425,15 +471,12 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
|
|||
switch (action) {
|
||||
case CPU_ONLINE:
|
||||
case CPU_ONLINE_FROZEN:
|
||||
if (microcode_init_cpu(cpu))
|
||||
printk(KERN_ERR "microcode: failed to init CPU%d\n",
|
||||
cpu);
|
||||
microcode_update_cpu(cpu);
|
||||
case CPU_DOWN_FAILED:
|
||||
case CPU_DOWN_FAILED_FROZEN:
|
||||
pr_debug("microcode: CPU%d added\n", cpu);
|
||||
if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
|
||||
printk(KERN_ERR "microcode: Failed to create the sysfs "
|
||||
"group for CPU%d\n", cpu);
|
||||
pr_err("microcode: Failed to create group for CPU%d\n", cpu);
|
||||
break;
|
||||
case CPU_DOWN_PREPARE:
|
||||
case CPU_DOWN_PREPARE_FROZEN:
|
||||
|
|
@ -465,13 +508,10 @@ static int __init microcode_init(void)
|
|||
microcode_ops = init_amd_microcode();
|
||||
|
||||
if (!microcode_ops) {
|
||||
printk(KERN_ERR "microcode: no support for this CPU vendor\n");
|
||||
pr_err("microcode: no support for this CPU vendor\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
error = microcode_dev_init();
|
||||
if (error)
|
||||
return error;
|
||||
microcode_pdev = platform_device_register_simple("microcode", -1,
|
||||
NULL, 0);
|
||||
if (IS_ERR(microcode_pdev)) {
|
||||
|
|
@ -480,23 +520,31 @@ static int __init microcode_init(void)
|
|||
}
|
||||
|
||||
get_online_cpus();
|
||||
mutex_lock(µcode_mutex);
|
||||
|
||||
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
|
||||
|
||||
mutex_unlock(µcode_mutex);
|
||||
put_online_cpus();
|
||||
|
||||
if (error) {
|
||||
microcode_dev_exit();
|
||||
platform_device_unregister(microcode_pdev);
|
||||
return error;
|
||||
}
|
||||
|
||||
error = microcode_dev_init();
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
register_hotcpu_notifier(&mc_cpu_notifier);
|
||||
|
||||
printk(KERN_INFO
|
||||
"Microcode Update Driver: v" MICROCODE_VERSION
|
||||
pr_info("Microcode Update Driver: v" MICROCODE_VERSION
|
||||
" <tigran@aivazian.fsnet.co.uk>,"
|
||||
" Peter Oruba\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
module_init(microcode_init);
|
||||
|
||||
static void __exit microcode_exit(void)
|
||||
{
|
||||
|
|
@ -505,16 +553,17 @@ static void __exit microcode_exit(void)
|
|||
unregister_hotcpu_notifier(&mc_cpu_notifier);
|
||||
|
||||
get_online_cpus();
|
||||
mutex_lock(µcode_mutex);
|
||||
|
||||
sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
|
||||
|
||||
mutex_unlock(µcode_mutex);
|
||||
put_online_cpus();
|
||||
|
||||
platform_device_unregister(microcode_pdev);
|
||||
|
||||
microcode_ops = NULL;
|
||||
|
||||
printk(KERN_INFO
|
||||
"Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
|
||||
pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
|
||||
}
|
||||
|
||||
module_init(microcode_init);
|
||||
module_exit(microcode_exit);
|
||||
|
|
|
|||
|
|
@ -70,24 +70,11 @@
|
|||
* Fix sigmatch() macro to handle old CPUs with pf == 0.
|
||||
* Thanks to Stuart Swales for pointing out this bug.
|
||||
*/
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/capability.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/firmware.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/cpumask.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
#include <asm/microcode.h>
|
||||
#include <asm/processor.h>
|
||||
|
|
@ -150,13 +137,9 @@ struct extended_sigtable {
|
|||
|
||||
#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 long flags;
|
||||
unsigned int val[2];
|
||||
|
||||
memset(csig, 0, sizeof(*csig));
|
||||
|
|
@ -176,18 +159,14 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
|
|||
csig->pf = 1 << ((val[1] >> 18) & 7);
|
||||
}
|
||||
|
||||
/* serialize access to the physical write to MSR 0x79 */
|
||||
spin_lock_irqsave(µcode_update_lock, flags);
|
||||
|
||||
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);
|
||||
spin_unlock_irqrestore(µcode_update_lock, flags);
|
||||
|
||||
pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
|
||||
csig->sig, csig->pf, csig->rev);
|
||||
printk(KERN_INFO "microcode: CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
|
||||
cpu_num, csig->sig, csig->pf, csig->rev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -318,11 +297,10 @@ get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void apply_microcode(int cpu)
|
||||
static int apply_microcode(int cpu)
|
||||
{
|
||||
struct microcode_intel *mc_intel;
|
||||
struct ucode_cpu_info *uci;
|
||||
unsigned long flags;
|
||||
unsigned int val[2];
|
||||
int cpu_num;
|
||||
|
||||
|
|
@ -334,10 +312,7 @@ static void apply_microcode(int cpu)
|
|||
BUG_ON(cpu_num != cpu);
|
||||
|
||||
if (mc_intel == NULL)
|
||||
return;
|
||||
|
||||
/* serialize access to the physical write to MSR 0x79 */
|
||||
spin_lock_irqsave(µcode_update_lock, flags);
|
||||
return 0;
|
||||
|
||||
/* write microcode via MSR 0x79 */
|
||||
wrmsr(MSR_IA32_UCODE_WRITE,
|
||||
|
|
@ -351,30 +326,32 @@ static void apply_microcode(int cpu)
|
|||
/* get the current revision from MSR 0x8B */
|
||||
rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
|
||||
|
||||
spin_unlock_irqrestore(µcode_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_ERR "microcode: CPU%d update "
|
||||
"to revision 0x%x failed\n",
|
||||
cpu_num, mc_intel->hdr.rev);
|
||||
return -1;
|
||||
}
|
||||
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],
|
||||
printk(KERN_INFO "microcode: CPU%d updated to revision "
|
||||
"0x%x, date = %04x-%02x-%02x \n",
|
||||
cpu_num, val[1],
|
||||
mc_intel->hdr.date & 0xffff,
|
||||
mc_intel->hdr.date >> 24,
|
||||
(mc_intel->hdr.date >> 16) & 0xff);
|
||||
|
||||
uci->cpu_sig.rev = val[1];
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int generic_load_microcode(int cpu, void *data, size_t size,
|
||||
int (*get_ucode_data)(void *, const void *, size_t))
|
||||
static enum ucode_state 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;
|
||||
enum ucode_state state = UCODE_OK;
|
||||
|
||||
while (leftover) {
|
||||
struct microcode_header_intel mc_header;
|
||||
|
|
@ -412,11 +389,15 @@ static int generic_load_microcode(int cpu, void *data, size_t size,
|
|||
leftover -= mc_size;
|
||||
}
|
||||
|
||||
if (!new_mc)
|
||||
goto out;
|
||||
|
||||
if (leftover) {
|
||||
vfree(new_mc);
|
||||
if (new_mc)
|
||||
vfree(new_mc);
|
||||
state = UCODE_ERROR;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (!new_mc) {
|
||||
state = UCODE_NFOUND;
|
||||
goto out;
|
||||
}
|
||||
|
||||
|
|
@ -427,9 +408,8 @@ static int generic_load_microcode(int cpu, void *data, size_t size,
|
|||
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);
|
||||
|
||||
out:
|
||||
return (int)leftover;
|
||||
out:
|
||||
return state;
|
||||
}
|
||||
|
||||
static int get_ucode_fw(void *to, const void *from, size_t n)
|
||||
|
|
@ -438,21 +418,19 @@ static int get_ucode_fw(void *to, const void *from, size_t n)
|
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return 0;
|
||||
}
|
||||
|
||||
static int request_microcode_fw(int cpu, struct device *device)
|
||||
static enum ucode_state request_microcode_fw(int cpu, struct device *device)
|
||||
{
|
||||
char name[30];
|
||||
struct cpuinfo_x86 *c = &cpu_data(cpu);
|
||||
const struct firmware *firmware;
|
||||
int ret;
|
||||
enum ucode_state 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) {
|
||||
|
||||
if (request_firmware(&firmware, name, device)) {
|
||||
pr_debug("microcode: data file %s load failed\n", name);
|
||||
return ret;
|
||||
return UCODE_NFOUND;
|
||||
}
|
||||
|
||||
ret = generic_load_microcode(cpu, (void *)firmware->data,
|
||||
|
|
@ -468,11 +446,9 @@ 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)
|
||||
static enum ucode_state
|
||||
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);
|
||||
}
|
||||
|
||||
|
|
|
|||
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Ссылка в новой задаче