5 files changed, 273 insertions, 184 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6cd6f24e1223..943667050dae 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -986,25 +986,25 @@ config X86_REBOOTFIXUPS
 	  Say N otherwise.
 
 config MICROCODE
-	tristate "/dev/cpu/microcode - microcode support"
+	tristate "CPU microcode loading support"
 	select FW_LOADER
 	---help---
+
 	  If you say Y here, you will be able to update the microcode on
 	  certain Intel and AMD processors. The Intel support is for the
-	  IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
-	  Pentium 4, Xeon etc. The AMD support is for family 0x10 and
-	  0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
-	  You will obviously need the actual microcode binary data itself
-	  which is not shipped with the Linux kernel.
+	  IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
+	  Xeon etc. The AMD support is for families 0x10 and later. You will
+	  obviously need the actual microcode binary data itself which is not
+	  shipped with the Linux kernel.
 
 	  This option selects the general module only, you need to select
 	  at least one vendor specific module as well.
 
-	  To compile this driver as a module, choose M here: the
-	  module will be called microcode.
+	  To compile this driver as a module, choose M here: the module
+	  will be called microcode.
 
 config MICROCODE_INTEL
-	bool "Intel microcode patch loading support"
+	bool "Intel microcode loading support"
 	depends on MICROCODE
 	default MICROCODE
 	select FW_LOADER
@@ -1017,7 +1017,7 @@ config MICROCODE_INTEL
 	  <http://www.urbanmyth.org/microcode/>.
 
 config MICROCODE_AMD
-	bool "AMD microcode patch loading support"
+	bool "AMD microcode loading support"
 	depends on MICROCODE
 	select FW_LOADER
 	---help---
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 4ebe157bf73d..43d921b4752c 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -15,8 +15,8 @@ struct microcode_ops {
 	enum ucode_state (*request_microcode_user) (int cpu,
 				const void __user *buf, size_t size);
 
-	enum ucode_state (*request_microcode_fw) (int cpu,
-				struct device *device);
+	enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
+						  bool refresh_fw);
 
 	void (*microcode_fini_cpu) (int cpu);
 
@@ -49,12 +49,6 @@ static inline struct microcode_ops * __init init_intel_microcode(void)
 #ifdef CONFIG_MICROCODE_AMD
 extern struct microcode_ops * __init init_amd_microcode(void);
 extern void __exit exit_amd_microcode(void);
-
-static inline void get_ucode_data(void *to, const u8 *from, size_t n)
-{
-	memcpy(to, from, n);
-}
-
 #else
 static inline struct microcode_ops * __init init_amd_microcode(void)
 {
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 82746f942cd8..7720ff5a9ee2 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -75,20 +75,113 @@ struct microcode_amd {
 
 static struct equiv_cpu_entry *equiv_cpu_table;
 
-/* page-sized ucode patch buffer */
-void *patch;
+struct ucode_patch {
+	struct list_head plist;
+	void *data;
+	u32 patch_id;
+	u16 equiv_cpu;
+};
+
+static LIST_HEAD(pcache);
+
+static u16 find_equiv_id(unsigned int cpu)
+{
+	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+	int i = 0;
+
+	if (!equiv_cpu_table)
+		return 0;
+
+	while (equiv_cpu_table[i].installed_cpu != 0) {
+		if (uci->cpu_sig.sig == equiv_cpu_table[i].installed_cpu)
+			return equiv_cpu_table[i].equiv_cpu;
+
+		i++;
+	}
+	return 0;
+}
+
+static u32 find_cpu_family_by_equiv_cpu(u16 equiv_cpu)
+{
+	int i = 0;
+
+	BUG_ON(!equiv_cpu_table);
+
+	while (equiv_cpu_table[i].equiv_cpu != 0) {
+		if (equiv_cpu == equiv_cpu_table[i].equiv_cpu)
+			return equiv_cpu_table[i].installed_cpu;
+		i++;
+	}
+	return 0;
+}
+
+/*
+ * a small, trivial cache of per-family ucode patches
+ */
+static struct ucode_patch *cache_find_patch(u16 equiv_cpu)
+{
+	struct ucode_patch *p;
+
+	list_for_each_entry(p, &pcache, plist)
+		if (p->equiv_cpu == equiv_cpu)
+			return p;
+	return NULL;
+}
+
+static void update_cache(struct ucode_patch *new_patch)
+{
+	struct ucode_patch *p;
+
+	list_for_each_entry(p, &pcache, plist) {
+		if (p->equiv_cpu == new_patch->equiv_cpu) {
+			if (p->patch_id >= new_patch->patch_id)
+				/* we already have the latest patch */
+				return;
+
+			list_replace(&p->plist, &new_patch->plist);
+			kfree(p->data);
+			kfree(p);
+			return;
+		}
+	}
+	/* no patch found, add it */
+	list_add_tail(&new_patch->plist, &pcache);
+}
+
+static void free_cache(void)
+{
+	struct ucode_patch *p, *tmp;
+
+	list_for_each_entry_safe(p, tmp, &pcache, plist) {
+		__list_del(p->plist.prev, p->plist.next);
+		kfree(p->data);
+		kfree(p);
+	}
+}
+
+static struct ucode_patch *find_patch(unsigned int cpu)
+{
+	u16 equiv_id;
+
+	equiv_id = find_equiv_id(cpu);
+	if (!equiv_id)
+		return NULL;
+
+	return cache_find_patch(equiv_id);
+}
 
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 
+	csig->sig = cpuid_eax(0x00000001);
 	csig->rev = c->microcode;
 	pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
 
 	return 0;
 }
 
-static unsigned int verify_ucode_size(int cpu, u32 patch_size,
+static unsigned int verify_patch_size(int cpu, u32 patch_size,
 				      unsigned int size)
 {
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
@@ -118,95 +211,37 @@ static unsigned int verify_ucode_size(int cpu, u32 patch_size,
 	return patch_size;
 }
 
-static u16 find_equiv_id(void)
+static int apply_microcode_amd(int cpu)
 {
-	unsigned int current_cpu_id, i = 0;
-
-	BUG_ON(equiv_cpu_table == NULL);
-
-	current_cpu_id = cpuid_eax(0x00000001);
-
-	while (equiv_cpu_table[i].installed_cpu != 0) {
-		if (current_cpu_id == equiv_cpu_table[i].installed_cpu)
-			return equiv_cpu_table[i].equiv_cpu;
-
-		i++;
-	}
-	return 0;
-}
+	struct cpuinfo_x86 *c = &cpu_data(cpu);
+	struct microcode_amd *mc_amd;
+	struct ucode_cpu_info *uci;
+	struct ucode_patch *p;
+	u32 rev, dummy;
 
-/*
- * we signal a good patch is found by returning its size > 0
- */
-static int get_matching_microcode(int cpu, const u8 *ucode_ptr,
-				  unsigned int leftover_size, int rev,
-				  unsigned int *current_size)
-{
-	struct microcode_header_amd *mc_hdr;
-	unsigned int actual_size, patch_size;
-	u16 equiv_cpu_id;
+	BUG_ON(raw_smp_processor_id() != cpu);
 
-	/* size of the current patch we're staring at */
-	patch_size = *(u32 *)(ucode_ptr + 4);
-	*current_size = patch_size + SECTION_HDR_SIZE;
+	uci = ucode_cpu_info + cpu;
 
-	equiv_cpu_id = find_equiv_id();
-	if (!equiv_cpu_id)
+	p = find_patch(cpu);
+	if (!p)
 		return 0;
 
-	/*
-	 * let's look at the patch header itself now
-	 */
-	mc_hdr = (struct microcode_header_amd *)(ucode_ptr + SECTION_HDR_SIZE);
+	mc_amd  = p->data;
+	uci->mc = p->data;
 
-	if (mc_hdr->processor_rev_id != equiv_cpu_id)
-		return 0;
+	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 
-	/* ucode might be chipset specific -- currently we don't support this */
-	if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) {
-		pr_err("CPU%d: chipset specific code not yet supported\n",
-		       cpu);
+	/* need to apply patch? */
+	if (rev >= mc_amd->hdr.patch_id) {
+		c->microcode = rev;
 		return 0;
 	}
 
-	if (mc_hdr->patch_id <= rev)
-		return 0;
-
-	/*
-	 * now that the header looks sane, verify its size
-	 */
-	actual_size = verify_ucode_size(cpu, patch_size, leftover_size);
-	if (!actual_size)
-		return 0;
-
-	/* clear the patch buffer */
-	memset(patch, 0, PAGE_SIZE);
-
-	/* all looks ok, get the binary patch */
-	get_ucode_data(patch, ucode_ptr + SECTION_HDR_SIZE, actual_size);
-
-	return actual_size;
-}
-
-static int apply_microcode_amd(int cpu)
-{
-	u32 rev, dummy;
-	int cpu_num = raw_smp_processor_id();
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
-	struct microcode_amd *mc_amd = uci->mc;
-	struct cpuinfo_x86 *c = &cpu_data(cpu);
-
-	/* We should bind the task to the CPU */
-	BUG_ON(cpu_num != cpu);
-
-	if (mc_amd == NULL)
-		return 0;
-
 	wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
-	/* get patch id after patching */
-	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 
-	/* check current patch id and patch's id for match */
+	/* verify patch application was successful */
+	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 	if (rev != mc_amd->hdr.patch_id) {
 		pr_err("CPU%d: update failed for patch_level=0x%08x\n",
 		       cpu, mc_amd->hdr.patch_id);
@@ -238,7 +273,7 @@ static int install_equiv_cpu_table(const u8 *buf)
 		return -ENOMEM;
 	}
 
-	get_ucode_data(equiv_cpu_table, buf + CONTAINER_HDR_SZ, size);
+	memcpy(equiv_cpu_table, buf + CONTAINER_HDR_SZ, size);
 
 	/* add header length */
 	return size + CONTAINER_HDR_SZ;
@@ -250,61 +285,113 @@ static void free_equiv_cpu_table(void)
 	equiv_cpu_table = NULL;
 }
 
-static enum ucode_state
-generic_load_microcode(int cpu, const u8 *data, size_t size)
+static void cleanup(void)
 {
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-	struct microcode_header_amd *mc_hdr = NULL;
-	unsigned int mc_size, leftover, current_size = 0;
+	free_equiv_cpu_table();
+	free_cache();
+}
+
+/*
+ * We return the current size even if some of the checks failed so that
+ * we can skip over the next patch. If we return a negative value, we
+ * signal a grave error like a memory allocation has failed and the
+ * driver cannot continue functioning normally. In such cases, we tear
+ * down everything we've used up so far and exit.
+ */
+static int verify_and_add_patch(unsigned int cpu, u8 *fw, unsigned int leftover)
+{
+	struct cpuinfo_x86 *c = &cpu_data(cpu);
+	struct microcode_header_amd *mc_hdr;
+	struct ucode_patch *patch;
+	unsigned int patch_size, crnt_size, ret;
+	u32 proc_fam;
+	u16 proc_id;
+
+	patch_size  = *(u32 *)(fw + 4);
+	crnt_size   = patch_size + SECTION_HDR_SIZE;
+	mc_hdr	    = (struct microcode_header_amd *)(fw + SECTION_HDR_SIZE);
+	proc_id	    = mc_hdr->processor_rev_id;
+
+	proc_fam = find_cpu_family_by_equiv_cpu(proc_id);
+	if (!proc_fam) {
+		pr_err("No patch family for equiv ID: 0x%04x\n", proc_id);
+		return crnt_size;
+	}
+
+	/* check if patch is for the current family */
+	proc_fam = ((proc_fam >> 8) & 0xf) + ((proc_fam >> 20) & 0xff);
+	if (proc_fam != c->x86)
+		return crnt_size;
+
+	if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) {
+		pr_err("Patch-ID 0x%08x: chipset-specific code unsupported.\n",
+			mc_hdr->patch_id);
+		return crnt_size;
+	}
+
+	ret = verify_patch_size(cpu, patch_size, leftover);
+	if (!ret) {
+		pr_err("Patch-ID 0x%08x: size mismatch.\n", mc_hdr->patch_id);
+		return crnt_size;
+	}
+
+	patch = kzalloc(sizeof(*patch), GFP_KERNEL);
+	if (!patch) {
+		pr_err("Patch allocation failure.\n");
+		return -EINVAL;
+	}
+
+	patch->data = kzalloc(patch_size, GFP_KERNEL);
+	if (!patch->data) {
+		pr_err("Patch data allocation failure.\n");
+		kfree(patch);
+		return -EINVAL;
+	}
+
+	/* All looks ok, copy patch... */
+	memcpy(patch->data, fw + SECTION_HDR_SIZE, patch_size);
+	INIT_LIST_HEAD(&patch->plist);
+	patch->patch_id  = mc_hdr->patch_id;
+	patch->equiv_cpu = proc_id;
+
+	/* ... and add to cache. */
+	update_cache(patch);
+
+	return crnt_size;
+}
+
+static enum ucode_state load_microcode_amd(int cpu, const u8 *data, size_t size)
+{
+	enum ucode_state ret = UCODE_ERROR;
+	unsigned int leftover;
+	u8 *fw = (u8 *)data;
+	int crnt_size = 0;
 	int offset;
-	const u8 *ucode_ptr = data;
-	void *new_mc = NULL;
-	unsigned int new_rev = uci->cpu_sig.rev;
-	enum ucode_state state = UCODE_ERROR;
 
-	offset = install_equiv_cpu_table(ucode_ptr);
+	offset = install_equiv_cpu_table(data);
 	if (offset < 0) {
 		pr_err("failed to create equivalent cpu table\n");
-		goto out;
+		return ret;
 	}
-	ucode_ptr += offset;
+	fw += offset;
 	leftover = size - offset;
 
-	if (*(u32 *)ucode_ptr != UCODE_UCODE_TYPE) {
+	if (*(u32 *)fw != UCODE_UCODE_TYPE) {
 		pr_err("invalid type field in container file section header\n");
-		goto free_table;
+		free_equiv_cpu_table();
+		return ret;
 	}
 
 	while (leftover) {
-		mc_size = get_matching_microcode(cpu, ucode_ptr, leftover,
-						 new_rev, &current_size);
-		if (mc_size) {
-			mc_hdr  = patch;
-			new_mc  = patch;
-			new_rev = mc_hdr->patch_id;
-			goto out_ok;
-		}
-
-		ucode_ptr += current_size;
-		leftover  -= current_size;
-	}
+		crnt_size = verify_and_add_patch(cpu, fw, leftover);
+		if (crnt_size < 0)
+			return ret;
 
-	if (!new_mc) {
-		state = UCODE_NFOUND;
-		goto free_table;
+		fw	 += crnt_size;
+		leftover -= crnt_size;
 	}
 
-out_ok:
-	uci->mc = new_mc;
-	state = UCODE_OK;
-	pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n",
-		 cpu, uci->cpu_sig.rev, new_rev);
-
-free_table:
-	free_equiv_cpu_table();
-
-out:
-	return state;
+	return UCODE_OK;
 }
 
 /*
@@ -315,7 +402,7 @@ out:
  *
  * This legacy file is always smaller than 2K in size.
  *
- * Starting at family 15h they are in family specific firmware files:
+ * Beginning with family 15h, they are in family-specific firmware files:
  *
  *    amd-ucode/microcode_amd_fam15h.bin
  *    amd-ucode/microcode_amd_fam16h.bin
@@ -323,12 +410,17 @@ out:
  *
  * These might be larger than 2K.
  */
-static enum ucode_state request_microcode_amd(int cpu, struct device *device)
+static enum ucode_state request_microcode_amd(int cpu, struct device *device,
+					      bool refresh_fw)
 {
 	char fw_name[36] = "amd-ucode/microcode_amd.bin";
-	const struct firmware *fw;
-	enum ucode_state ret = UCODE_NFOUND;
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
+	enum ucode_state ret = UCODE_NFOUND;
+	const struct firmware *fw;
+
+	/* reload ucode container only on the boot cpu */
+	if (!refresh_fw || c->cpu_index != boot_cpu_data.cpu_index)
+		return UCODE_OK;
 
 	if (c->x86 >= 0x15)
 		snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);
@@ -344,12 +436,17 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device)
 		goto fw_release;
 	}
 
-	ret = generic_load_microcode(cpu, fw->data, fw->size);
+	/* free old equiv table */
+	free_equiv_cpu_table();
+
+	ret = load_microcode_amd(cpu, fw->data, fw->size);
+	if (ret != UCODE_OK)
+		cleanup();
 
-fw_release:
+ fw_release:
 	release_firmware(fw);
 
-out:
+ out:
 	return ret;
 }
 
@@ -383,14 +480,10 @@ struct microcode_ops * __init init_amd_microcode(void)
 		return NULL;
 	}
 
-	patch = (void *)get_zeroed_page(GFP_KERNEL);
-	if (!patch)
-		return NULL;
-
 	return &microcode_amd_ops;
 }
 
 void __exit exit_amd_microcode(void)
 {
-	free_page((unsigned long)patch);
+	cleanup();
 }
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 9e5bcf1e2376..3a04b224d0c0 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -279,19 +279,18 @@ static struct platform_device	*microcode_pdev;
 static int reload_for_cpu(int cpu)
 {
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+	enum ucode_state ustate;
 	int err = 0;
 
-	if (uci->valid) {
-		enum ucode_state ustate;
-
-		ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev);
-		if (ustate == UCODE_OK)
-			apply_microcode_on_target(cpu);
-		else
-			if (ustate == UCODE_ERROR)
-				err = -EINVAL;
-	}
+	if (!uci->valid)
+		return err;
 
+	ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev, true);
+	if (ustate == UCODE_OK)
+		apply_microcode_on_target(cpu);
+	else
+		if (ustate == UCODE_ERROR)
+			err = -EINVAL;
 	return err;
 }
 
@@ -373,18 +372,15 @@ static void microcode_fini_cpu(int cpu)
 
 static enum ucode_state microcode_resume_cpu(int cpu)
 {
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
-	if (!uci->mc)
-		return UCODE_NFOUND;
-
 	pr_debug("CPU%d updated upon resume\n", cpu);
-	apply_microcode_on_target(cpu);
+
+	if (apply_microcode_on_target(cpu))
+		return UCODE_ERROR;
 
 	return UCODE_OK;
 }
 
-static enum ucode_state microcode_init_cpu(int cpu)
+static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
 {
 	enum ucode_state ustate;
 
@@ -395,7 +391,8 @@ static enum ucode_state microcode_init_cpu(int cpu)
 	if (system_state != SYSTEM_RUNNING)
 		return UCODE_NFOUND;
 
-	ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev);
+	ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev,
+						     refresh_fw);
 
 	if (ustate == UCODE_OK) {
 		pr_debug("CPU%d updated upon init\n", cpu);
@@ -408,14 +405,11 @@ static enum ucode_state microcode_init_cpu(int cpu)
 static enum ucode_state microcode_update_cpu(int cpu)
 {
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-	enum ucode_state ustate;
 
 	if (uci->valid)
-		ustate = microcode_resume_cpu(cpu);
-	else
-		ustate = microcode_init_cpu(cpu);
+		return microcode_resume_cpu(cpu);
 
-	return ustate;
+	return microcode_init_cpu(cpu, false);
 }
 
 static int mc_device_add(struct device *dev, struct subsys_interface *sif)
@@ -431,7 +425,7 @@ static int mc_device_add(struct device *dev, struct subsys_interface *sif)
 	if (err)
 		return err;
 
-	if (microcode_init_cpu(cpu) == UCODE_ERROR)
+	if (microcode_init_cpu(cpu, true) == UCODE_ERROR)
 		return -EINVAL;
 
 	return err;
@@ -480,34 +474,41 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
 	struct device *dev;
 
 	dev = get_cpu_device(cpu);
-	switch (action) {
+
+	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
 		microcode_update_cpu(cpu);
-	case CPU_DOWN_FAILED:
-	case CPU_DOWN_FAILED_FROZEN:
 		pr_debug("CPU%d added\n", cpu);
+		/*
+		 * "break" is missing on purpose here because we want to fall
+		 * through in order to create the sysfs group.
+		 */
+
+	case CPU_DOWN_FAILED:
 		if (sysfs_create_group(&dev->kobj, &mc_attr_group))
 			pr_err("Failed to create group for CPU%d\n", cpu);
 		break;
+
 	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
 		/* Suspend is in progress, only remove the interface */
 		sysfs_remove_group(&dev->kobj, &mc_attr_group);
 		pr_debug("CPU%d removed\n", cpu);
 		break;
 
 	/*
+	 * case CPU_DEAD:
+	 *
 	 * When a CPU goes offline, don't free up or invalidate the copy of
 	 * the microcode in kernel memory, so that we can reuse it when the
 	 * CPU comes back online without unnecessarily requesting the userspace
 	 * for it again.
 	 */
-	case CPU_UP_CANCELED_FROZEN:
-		/* The CPU refused to come up during a system resume */
-		microcode_fini_cpu(cpu);
-		break;
 	}
+
+	/* The CPU refused to come up during a system resume */
+	if (action == CPU_UP_CANCELED_FROZEN)
+		microcode_fini_cpu(cpu);
+
 	return NOTIFY_OK;
 }
 
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 0327e2b3c408..3544aed39338 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -405,7 +405,8 @@ static int get_ucode_fw(void *to, const void *from, size_t n)
 	return 0;
 }
 
-static enum ucode_state request_microcode_fw(int cpu, struct device *device)
+static enum ucode_state request_microcode_fw(int cpu, struct device *device,
+					     bool refresh_fw)
 {
 	char name[30];
 	struct cpuinfo_x86 *c = &cpu_data(cpu);