1 files changed, 39 insertions, 166 deletions

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 6a41cee242f6..712aafff96e0 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -319,60 +319,6 @@ void reload_early_microcode(void)
 	}
 }
 
-static void collect_cpu_info_local(void *arg)
-{
-	struct cpu_info_ctx *ctx = arg;
-
-	ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
-						   ctx->cpu_sig);
-}
-
-static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
-{
-	struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
-	int ret;
-
-	ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
-	if (!ret)
-		ret = ctx.err;
-
-	return ret;
-}
-
-static int collect_cpu_info(int cpu)
-{
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-	int ret;
-
-	memset(uci, 0, sizeof(*uci));
-
-	ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
-	if (!ret)
-		uci->valid = 1;
-
-	return ret;
-}
-
-static void apply_microcode_local(void *arg)
-{
-	enum ucode_state *err = arg;
-
-	*err = microcode_ops->apply_microcode(smp_processor_id());
-}
-
-static int apply_microcode_on_target(int cpu)
-{
-	enum ucode_state err;
-	int ret;
-
-	ret = smp_call_function_single(cpu, apply_microcode_local, &err, 1);
-	if (!ret) {
-		if (err == UCODE_ERROR)
-			ret = 1;
-	}
-	return ret;
-}
-
 /* fake device for request_firmware */
 static struct platform_device	*microcode_pdev;
 
@@ -458,7 +404,7 @@ static int __reload_late(void *info)
 	 * below.
 	 */
 	if (cpumask_first(topology_sibling_cpumask(cpu)) == cpu)
-		apply_microcode_local(&err);
+		err = microcode_ops->apply_microcode(cpu);
 	else
 		goto wait_for_siblings;
 
@@ -480,7 +426,7 @@ wait_for_siblings:
 	 * revision.
 	 */
 	if (cpumask_first(topology_sibling_cpumask(cpu)) != cpu)
-		apply_microcode_local(&err);
+		err = microcode_ops->apply_microcode(cpu);
 
 	return ret;
 }
@@ -531,7 +477,7 @@ static ssize_t reload_store(struct device *dev,
 	if (ret)
 		goto put;
 
-	tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev, true);
+	tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev);
 	if (tmp_ret != UCODE_NEW)
 		goto put;
 
@@ -589,91 +535,17 @@ static void microcode_fini_cpu(int cpu)
 		microcode_ops->microcode_fini_cpu(cpu);
 }
 
-static enum ucode_state microcode_resume_cpu(int cpu)
+static enum ucode_state microcode_init_cpu(int cpu)
 {
-	if (apply_microcode_on_target(cpu))
-		return UCODE_ERROR;
-
-	pr_debug("CPU%d updated upon resume\n", cpu);
-
-	return UCODE_OK;
-}
-
-static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
-{
-	enum ucode_state ustate;
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-	if (uci->valid)
-		return UCODE_OK;
-
-	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, &microcode_pdev->dev, refresh_fw);
-	if (ustate == UCODE_NEW) {
-		pr_debug("CPU%d updated upon init\n", cpu);
-		apply_microcode_on_target(cpu);
-	}
-
-	return ustate;
-}
-
-static enum ucode_state microcode_update_cpu(int cpu)
-{
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
-	/* Refresh CPU microcode revision after resume. */
-	collect_cpu_info(cpu);
-
-	if (uci->valid)
-		return microcode_resume_cpu(cpu);
-
-	return microcode_init_cpu(cpu, false);
-}
-
-static int mc_device_add(struct device *dev, struct subsys_interface *sif)
-{
-	int err, cpu = dev->id;
-
-	if (!cpu_online(cpu))
-		return 0;
-
-	pr_debug("CPU%d added\n", cpu);
-
-	err = sysfs_create_group(&dev->kobj, &mc_attr_group);
-	if (err)
-		return err;
+	memset(uci, 0, sizeof(*uci));
 
-	if (microcode_init_cpu(cpu, true) == UCODE_ERROR)
-		return -EINVAL;
+	microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
 
-	return err;
+	return microcode_ops->apply_microcode(cpu);
 }
 
-static void mc_device_remove(struct device *dev, struct subsys_interface *sif)
-{
-	int cpu = dev->id;
-
-	if (!cpu_online(cpu))
-		return;
-
-	pr_debug("CPU%d removed\n", cpu);
-	microcode_fini_cpu(cpu);
-	sysfs_remove_group(&dev->kobj, &mc_attr_group);
-}
-
-static struct subsys_interface mc_cpu_interface = {
-	.name			= "microcode",
-	.subsys			= &cpu_subsys,
-	.add_dev		= mc_device_add,
-	.remove_dev		= mc_device_remove,
-};
-
 /**
  * microcode_bsp_resume - Update boot CPU microcode during resume.
  */
@@ -682,21 +554,23 @@ void microcode_bsp_resume(void)
 	int cpu = smp_processor_id();
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-	if (uci->valid && uci->mc)
+	if (uci->mc)
 		microcode_ops->apply_microcode(cpu);
-	else if (!uci->mc)
+	else
 		reload_early_microcode();
 }
 
 static struct syscore_ops mc_syscore_ops = {
-	.resume			= microcode_bsp_resume,
+	.resume	= microcode_bsp_resume,
 };
 
 static int mc_cpu_starting(unsigned int cpu)
 {
-	microcode_update_cpu(cpu);
-	pr_debug("CPU%d added\n", cpu);
-	return 0;
+	enum ucode_state err = microcode_ops->apply_microcode(cpu);
+
+	pr_debug("%s: CPU%d, err: %d\n", __func__, cpu, err);
+
+	return err == UCODE_ERROR;
 }
 
 static int mc_cpu_online(unsigned int cpu)
@@ -713,13 +587,30 @@ static int mc_cpu_down_prep(unsigned int cpu)
 	struct device *dev;
 
 	dev = get_cpu_device(cpu);
+
+	microcode_fini_cpu(cpu);
+
 	/* Suspend is in progress, only remove the interface */
 	sysfs_remove_group(&dev->kobj, &mc_attr_group);
-	pr_debug("CPU%d removed\n", cpu);
+	pr_debug("%s: CPU%d\n", __func__, cpu);
 
 	return 0;
 }
 
+static void setup_online_cpu(struct work_struct *work)
+{
+	int cpu = smp_processor_id();
+	enum ucode_state err;
+
+	err = microcode_init_cpu(cpu);
+	if (err == UCODE_ERROR) {
+		pr_err("Error applying microcode on CPU%d\n", cpu);
+		return;
+	}
+
+	mc_cpu_online(cpu);
+}
+
 static struct attribute *cpu_root_microcode_attrs[] = {
 #ifdef CONFIG_MICROCODE_LATE_LOADING
 	&dev_attr_reload.attr,
@@ -750,28 +641,19 @@ static int __init microcode_init(void)
 	if (!microcode_ops)
 		return -ENODEV;
 
-	microcode_pdev = platform_device_register_simple("microcode", -1,
-							 NULL, 0);
+	microcode_pdev = platform_device_register_simple("microcode", -1, NULL, 0);
 	if (IS_ERR(microcode_pdev))
 		return PTR_ERR(microcode_pdev);
 
-	cpus_read_lock();
-	mutex_lock(&microcode_mutex);
-	error = subsys_interface_register(&mc_cpu_interface);
-	mutex_unlock(&microcode_mutex);
-	cpus_read_unlock();
-
-	if (error)
-		goto out_pdev;
-
-	error = sysfs_create_group(&cpu_subsys.dev_root->kobj,
-				   &cpu_root_microcode_group);
-
+	error = sysfs_create_group(&cpu_subsys.dev_root->kobj, &cpu_root_microcode_group);
 	if (error) {
 		pr_err("Error creating microcode group!\n");
-		goto out_driver;
+		goto out_pdev;
 	}
 
+	/* Do per-CPU setup */
+	schedule_on_each_cpu(setup_online_cpu);
+
 	register_syscore_ops(&mc_syscore_ops);
 	cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:starting",
 				  mc_cpu_starting, NULL);
@@ -782,15 +664,6 @@ static int __init microcode_init(void)
 
 	return 0;
 
- out_driver:
-	cpus_read_lock();
-	mutex_lock(&microcode_mutex);
-
-	subsys_interface_unregister(&mc_cpu_interface);
-
-	mutex_unlock(&microcode_mutex);
-	cpus_read_unlock();
-
  out_pdev:
 	platform_device_unregister(microcode_pdev);
 	return error;