disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/arch/x86/kernel/cpu/microcode/core.c
..
..
@@ -55,7 +55,7 @@
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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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+ * - cpus_read_lock/unlock() 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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..
@@ -315,7 +315,7 @@
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 #endif
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 }
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317
 
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-void reload_early_microcode(void)
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+void reload_early_microcode(unsigned int cpu)
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 {
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 	int vendor, family;
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321
 
..
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@@ -329,7 +329,7 @@
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 		break;
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 	case X86_VENDOR_AMD:
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 		if (family >= 0x10)
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-			reload_ucode_amd();
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+			reload_ucode_amd(cpu);
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 		break;
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 	default:
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 		break;
..
..
@@ -390,101 +390,10 @@
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 	return ret;
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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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-	int error = 0;
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-	int cpu;
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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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-		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_NEW) {
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-			apply_microcode_on_target(cpu);
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-		}
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-	}
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-
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-	return error;
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-}
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-
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-static int microcode_open(struct inode *inode, struct file *file)
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-{
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-	return capable(CAP_SYS_RAWIO) ? stream_open(inode, file) : -EPERM;
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-}
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-
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-static ssize_t microcode_write(struct file *file, const char __user *buf,
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-			       size_t len, loff_t *ppos)
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-{
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-	ssize_t ret = -EINVAL;
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-	unsigned long nr_pages = totalram_pages();
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-
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-	if ((len >> PAGE_SHIFT) > nr_pages) {
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-		pr_err("too much data (max %ld pages)\n", nr_pages);
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-		return ret;
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-	}
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-
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-	get_online_cpus();
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-	mutex_lock(&microcode_mutex);
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-
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-	if (do_microcode_update(buf, len) == 0)
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-		ret = (ssize_t)len;
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-
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-	if (ret > 0)
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-		perf_check_microcode();
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-
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-	mutex_unlock(&microcode_mutex);
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-	put_online_cpus();
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-
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-	return ret;
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-}
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-
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-static const struct file_operations microcode_fops = {
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-	.owner			= THIS_MODULE,
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-	.write			= microcode_write,
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-	.open			= microcode_open,
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-	.llseek		= no_llseek,
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-};
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-
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-static struct miscdevice microcode_dev = {
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-	.minor			= MICROCODE_MINOR,
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-	.name			= "microcode",
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-	.nodename		= "cpu/microcode",
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-	.fops			= &microcode_fops,
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-};
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-
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-static int __init microcode_dev_init(void)
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-{
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-	int error;
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-
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-	error = misc_register(&microcode_dev);
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-	if (error) {
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-		pr_err("can't misc_register on minor=%d\n", MICROCODE_MINOR);
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-		return error;
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-	}
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-
473
-	return 0;
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-}
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-
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-static void __exit microcode_dev_exit(void)
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-{
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-	misc_deregister(&microcode_dev);
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-}
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-#else
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-#define microcode_dev_init()	0
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-#define microcode_dev_exit()	do { } while (0)
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-#endif
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-
485
393
 /* fake device for request_firmware */
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 static struct platform_device	*microcode_pdev;
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395
 
396
+#ifdef CONFIG_MICROCODE_LATE_LOADING
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 /*
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  * Late loading dance. Why the heavy-handed stomp_machine effort?
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  *
..
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@@ -599,16 +508,27 @@
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  */
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 static int microcode_reload_late(void)
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 {
602
-	int ret;
511
+	int old = boot_cpu_data.microcode, ret;
512
+	struct cpuinfo_x86 prev_info;
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513
 
604
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 	atomic_set(&late_cpus_in,  0);
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 	atomic_set(&late_cpus_out, 0);
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516
 
607
-	ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
608
-	if (ret == 0)
609
-		microcode_check();
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+	/*
518
+	 * Take a snapshot before the microcode update in order to compare and
519
+	 * check whether any bits changed after an update.
520
+	 */
521
+	store_cpu_caps(&prev_info);
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522
 
611
-	pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode);
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+	ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
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+	if (!ret) {
525
+		pr_info("Reload succeeded, microcode revision: 0x%x -> 0x%x\n",
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+			old, boot_cpu_data.microcode);
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+		microcode_check(&prev_info);
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+	} else {
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+		pr_info("Reload failed, current microcode revision: 0x%x\n",
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+			boot_cpu_data.microcode);
531
+	}
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532
 
613
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 	return ret;
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534
 }
..
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@@ -629,7 +549,7 @@
629
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 	if (val != 1)
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 		return size;
631
551
 
632
-	get_online_cpus();
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+	cpus_read_lock();
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553
 
634
554
 	ret = check_online_cpus();
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555
 	if (ret)
..
..
@@ -644,13 +564,16 @@
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 	mutex_unlock(&microcode_mutex);
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565
 
646
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 put:
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-	put_online_cpus();
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+	cpus_read_unlock();
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568
 
649
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 	if (ret == 0)
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 		ret = size;
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571
 
652
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 	return ret;
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573
 }
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+
575
+static DEVICE_ATTR_WO(reload);
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+#endif
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577
 
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 static ssize_t version_show(struct device *dev,
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579
 			struct device_attribute *attr, char *buf)
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@@ -668,7 +591,6 @@
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 	return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
669
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 }
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593
 
671
-static DEVICE_ATTR_WO(reload);
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 static DEVICE_ATTR(version, 0444, version_show, NULL);
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 static DEVICE_ATTR(processor_flags, 0444, pf_show, NULL);
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596
 
..
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@@ -785,7 +707,7 @@
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 	if (uci->valid && uci->mc)
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 		microcode_ops->apply_microcode(cpu);
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 	else if (!uci->mc)
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-		reload_early_microcode();
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+		reload_early_microcode(cpu);
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 }
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712
 
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 static struct syscore_ops mc_syscore_ops = {
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@@ -821,7 +743,9 @@
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 }
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823
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 static struct attribute *cpu_root_microcode_attrs[] = {
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+#ifdef CONFIG_MICROCODE_LATE_LOADING
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 	&dev_attr_reload.attr,
748
+#endif
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 	NULL
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 };
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..
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@@ -853,14 +777,14 @@
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 	if (IS_ERR(microcode_pdev))
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 		return PTR_ERR(microcode_pdev);
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779
 
856
-	get_online_cpus();
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+	cpus_read_lock();
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 	mutex_lock(&microcode_mutex);
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782
 
859
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 	error = subsys_interface_register(&mc_cpu_interface);
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784
 	if (!error)
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 		perf_check_microcode();
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786
 	mutex_unlock(&microcode_mutex);
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-	put_online_cpus();
787
+	cpus_read_unlock();
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788
 
865
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 	if (error)
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 		goto out_pdev;
..
..
@@ -873,10 +797,6 @@
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 		goto out_driver;
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 	}
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799
 
876
-	error = microcode_dev_init();
877
-	if (error)
878
-		goto out_ucode_group;
879
-
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 	register_syscore_ops(&mc_syscore_ops);
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 	cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:starting",
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 				  mc_cpu_starting, NULL);
..
..
@@ -887,18 +807,14 @@
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807
 
888
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 	return 0;
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809
 
890
- out_ucode_group:
891
-	sysfs_remove_group(&cpu_subsys.dev_root->kobj,
892
-			   &cpu_root_microcode_group);
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-
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810
  out_driver:
895
-	get_online_cpus();
811
+	cpus_read_lock();
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 	mutex_lock(&microcode_mutex);
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813
 
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 	subsys_interface_unregister(&mc_cpu_interface);
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815
 
900
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 	mutex_unlock(&microcode_mutex);
901
-	put_online_cpus();
817
+	cpus_read_unlock();
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818
 
903
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  out_pdev:
904
820
 	platform_device_unregister(microcode_pdev);