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-rw-r--r--arch/x86/kernel/cpuid.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
new file mode 100644
index 0000000000..dae436253d
--- /dev/null
+++ b/arch/x86/kernel/cpuid.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * x86 CPUID access device
+ *
+ * This device is accessed by lseek() to the appropriate CPUID level
+ * and then read in chunks of 16 bytes. A larger size means multiple
+ * reads of consecutive levels.
+ *
+ * The lower 32 bits of the file position is used as the incoming %eax,
+ * and the upper 32 bits of the file position as the incoming %ecx,
+ * the latter intended for "counting" eax levels like eax=4.
+ *
+ * This driver uses /dev/cpu/%d/cpuid where %d is the minor number, and on
+ * an SMP box will direct the access to CPU %d.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/smp.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
+#include <linux/uaccess.h>
+#include <linux/gfp.h>
+#include <linux/completion.h>
+
+#include <asm/processor.h>
+#include <asm/msr.h>
+
+static enum cpuhp_state cpuhp_cpuid_state;
+
+struct cpuid_regs_done {
+ struct cpuid_regs regs;
+ struct completion done;
+};
+
+static void cpuid_smp_cpuid(void *cmd_block)
+{
+ struct cpuid_regs_done *cmd = cmd_block;
+
+ cpuid_count(cmd->regs.eax, cmd->regs.ecx,
+ &cmd->regs.eax, &cmd->regs.ebx,
+ &cmd->regs.ecx, &cmd->regs.edx);
+
+ complete(&cmd->done);
+}
+
+static ssize_t cpuid_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char __user *tmp = buf;
+ struct cpuid_regs_done cmd;
+ int cpu = iminor(file_inode(file));
+ u64 pos = *ppos;
+ ssize_t bytes = 0;
+ int err = 0;
+
+ if (count % 16)
+ return -EINVAL; /* Invalid chunk size */
+
+ init_completion(&cmd.done);
+ for (; count; count -= 16) {
+ call_single_data_t csd;
+
+ INIT_CSD(&csd, cpuid_smp_cpuid, &cmd);
+
+ cmd.regs.eax = pos;
+ cmd.regs.ecx = pos >> 32;
+
+ err = smp_call_function_single_async(cpu, &csd);
+ if (err)
+ break;
+ wait_for_completion(&cmd.done);
+ if (copy_to_user(tmp, &cmd.regs, 16)) {
+ err = -EFAULT;
+ break;
+ }
+ tmp += 16;
+ bytes += 16;
+ *ppos = ++pos;
+ reinit_completion(&cmd.done);
+ }
+
+ return bytes ? bytes : err;
+}
+
+static int cpuid_open(struct inode *inode, struct file *file)
+{
+ unsigned int cpu;
+ struct cpuinfo_x86 *c;
+
+ cpu = iminor(file_inode(file));
+ if (cpu >= nr_cpu_ids || !cpu_online(cpu))
+ return -ENXIO; /* No such CPU */
+
+ c = &cpu_data(cpu);
+ if (c->cpuid_level < 0)
+ return -EIO; /* CPUID not supported */
+
+ return 0;
+}
+
+/*
+ * File operations we support
+ */
+static const struct file_operations cpuid_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_seek_end_llseek,
+ .read = cpuid_read,
+ .open = cpuid_open,
+};
+
+static char *cpuid_devnode(const struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));
+}
+
+static const struct class cpuid_class = {
+ .name = "cpuid",
+ .devnode = cpuid_devnode,
+};
+
+static int cpuid_device_create(unsigned int cpu)
+{
+ struct device *dev;
+
+ dev = device_create(&cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu), NULL,
+ "cpu%d", cpu);
+ return PTR_ERR_OR_ZERO(dev);
+}
+
+static int cpuid_device_destroy(unsigned int cpu)
+{
+ device_destroy(&cpuid_class, MKDEV(CPUID_MAJOR, cpu));
+ return 0;
+}
+
+static int __init cpuid_init(void)
+{
+ int err;
+
+ if (__register_chrdev(CPUID_MAJOR, 0, NR_CPUS,
+ "cpu/cpuid", &cpuid_fops)) {
+ printk(KERN_ERR "cpuid: unable to get major %d for cpuid\n",
+ CPUID_MAJOR);
+ return -EBUSY;
+ }
+ err = class_register(&cpuid_class);
+ if (err)
+ goto out_chrdev;
+
+ err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/cpuid:online",
+ cpuid_device_create, cpuid_device_destroy);
+ if (err < 0)
+ goto out_class;
+
+ cpuhp_cpuid_state = err;
+ return 0;
+
+out_class:
+ class_unregister(&cpuid_class);
+out_chrdev:
+ __unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid");
+ return err;
+}
+module_init(cpuid_init);
+
+static void __exit cpuid_exit(void)
+{
+ cpuhp_remove_state(cpuhp_cpuid_state);
+ class_unregister(&cpuid_class);
+ __unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid");
+}
+module_exit(cpuid_exit);
+
+MODULE_AUTHOR("H. Peter Anvin <hpa@zytor.com>");
+MODULE_DESCRIPTION("x86 generic CPUID driver");
+MODULE_LICENSE("GPL");