[PATCH] x86-64: Merge msr.c with i386 version

The only difference was the inline assembly, so move that into
asm/msr.h and merge with the i386 version.

This adds some missing sysfs support code to x86-64.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 28 insertions, 291 deletions

diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 1579bdd0adc..bcdd0a805fe 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -46,3 +46,4 @@ microcode-$(subst m,y,$(CONFIG_MICROCODE))  += ../../i386/kernel/microcode.o
 intel_cacheinfo-y		+= ../../i386/kernel/cpu/intel_cacheinfo.o
 quirks-y			+= ../../i386/kernel/quirks.o
 i8237-y				+= ../../i386/kernel/i8237.o
+msr-$(subst m,y,$(CONFIG_X86_MSR))  += ../../i386/kernel/msr.o
diff --git a/arch/x86_64/kernel/msr.c b/arch/x86_64/kernel/msr.c
deleted file mode 100644
index 598953ab015..00000000000
--- a/arch/x86_64/kernel/msr.c
+++ /dev/null
@@ -1,279 +0,0 @@
-/* ----------------------------------------------------------------------- *
- *   
- *   Copyright 2000 H. Peter Anvin - All Rights Reserved
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
- *   USA; either version 2 of the License, or (at your option) any later
- *   version; incorporated herein by reference.
- *
- * ----------------------------------------------------------------------- */
-
-/*
- * msr.c
- *
- * x86 MSR access device
- *
- * This device is accessed by lseek() to the appropriate register number
- * and then read/write in chunks of 8 bytes.  A larger size means multiple
- * reads or writes of the same register.
- *
- * This driver uses /dev/cpu/%d/msr where %d is the minor number, and on
- * an SMP box will direct the access to CPU %d.
- */
-
-#include <linux/module.h>
-#include <linux/config.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/smp_lock.h>
-#include <linux/major.h>
-#include <linux/fs.h>
-
-#include <asm/processor.h>
-#include <asm/msr.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-/* Note: "err" is handled in a funny way below.  Otherwise one version
-   of gcc or another breaks. */
-
-static inline int wrmsr_eio(u32 reg, u32 eax, u32 edx)
-{
-	int err;
-
-	asm volatile ("1:	wrmsr\n"
-		      "2:\n"
-		      ".section .fixup,\"ax\"\n"
-		      "3:	movl %4,%0\n"
-		      "	jmp 2b\n"
-		      ".previous\n"
-		      ".section __ex_table,\"a\"\n"
-		      "	.align 8\n" "	.quad 1b,3b\n" ".previous":"=&bDS" (err)
-		      :"a"(eax), "d"(edx), "c"(reg), "i"(-EIO), "0"(0));
-
-	return err;
-}
-
-static inline int rdmsr_eio(u32 reg, u32 *eax, u32 *edx)
-{
-	int err;
-
-	asm volatile ("1:	rdmsr\n"
-		      "2:\n"
-		      ".section .fixup,\"ax\"\n"
-		      "3:	movl %4,%0\n"
-		      "	jmp 2b\n"
-		      ".previous\n"
-		      ".section __ex_table,\"a\"\n"
-		      "	.align 8\n"
-		      "	.quad 1b,3b\n"
-		      ".previous":"=&bDS" (err), "=a"(*eax), "=d"(*edx)
-		      :"c"(reg), "i"(-EIO), "0"(0));
-
-	return err;
-}
-
-#ifdef CONFIG_SMP
-
-struct msr_command {
-	int cpu;
-	int err;
-	u32 reg;
-	u32 data[2];
-};
-
-static void msr_smp_wrmsr(void *cmd_block)
-{
-	struct msr_command *cmd = (struct msr_command *)cmd_block;
-
-	if (cmd->cpu == smp_processor_id())
-		cmd->err = wrmsr_eio(cmd->reg, cmd->data[0], cmd->data[1]);
-}
-
-static void msr_smp_rdmsr(void *cmd_block)
-{
-	struct msr_command *cmd = (struct msr_command *)cmd_block;
-
-	if (cmd->cpu == smp_processor_id())
-		cmd->err = rdmsr_eio(cmd->reg, &cmd->data[0], &cmd->data[1]);
-}
-
-static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
-{
-	struct msr_command cmd;
-	int ret;
-
-	preempt_disable();
-	if (cpu == smp_processor_id()) {
-		ret = wrmsr_eio(reg, eax, edx);
-	} else {
-		cmd.cpu = cpu;
-		cmd.reg = reg;
-		cmd.data[0] = eax;
-		cmd.data[1] = edx;
-
-		smp_call_function(msr_smp_wrmsr, &cmd, 1, 1);
-		ret = cmd.err;
-	}
-	preempt_enable();
-	return ret;
-}
-
-static inline int do_rdmsr(int cpu, u32 reg, u32 * eax, u32 * edx)
-{
-	struct msr_command cmd;
-	int ret;
-
-	preempt_disable();
-	if (cpu == smp_processor_id()) {
-		ret = rdmsr_eio(reg, eax, edx);
-	} else {
-		cmd.cpu = cpu;
-		cmd.reg = reg;
-
-		smp_call_function(msr_smp_rdmsr, &cmd, 1, 1);
-
-		*eax = cmd.data[0];
-		*edx = cmd.data[1];
-
-		ret = cmd.err;
-	}
-	preempt_enable();
-	return ret;
-}
-
-#else				/* ! CONFIG_SMP */
-
-static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
-{
-	return wrmsr_eio(reg, eax, edx);
-}
-
-static inline int do_rdmsr(int cpu, u32 reg, u32 *eax, u32 *edx)
-{
-	return rdmsr_eio(reg, eax, edx);
-}
-
-#endif				/* ! CONFIG_SMP */
-
-static loff_t msr_seek(struct file *file, loff_t offset, int orig)
-{
-	loff_t ret = -EINVAL;
-
-	lock_kernel();
-	switch (orig) {
-	case 0:
-		file->f_pos = offset;
-		ret = file->f_pos;
-		break;
-	case 1:
-		file->f_pos += offset;
-		ret = file->f_pos;
-	}
-	unlock_kernel();
-	return ret;
-}
-
-static ssize_t msr_read(struct file *file, char __user * buf,
-			size_t count, loff_t * ppos)
-{
-	u32 __user *tmp = (u32 __user *) buf;
-	u32 data[2];
-	size_t rv;
-	u32 reg = *ppos;
-	int cpu = iminor(file->f_dentry->d_inode);
-	int err;
-
-	if (count % 8)
-		return -EINVAL;	/* Invalid chunk size */
-
-	for (rv = 0; count; count -= 8) {
-		err = do_rdmsr(cpu, reg, &data[0], &data[1]);
-		if (err)
-			return err;
-		if (copy_to_user(tmp, &data, 8))
-			return -EFAULT;
-		tmp += 2;
-	}
-
-	return ((char __user *)tmp) - buf;
-}
-
-static ssize_t msr_write(struct file *file, const char __user *buf,
-			 size_t count, loff_t *ppos)
-{
-	const u32 __user *tmp = (const u32 __user *)buf;
-	u32 data[2];
-	size_t rv;
-	u32 reg = *ppos;
-	int cpu = iminor(file->f_dentry->d_inode);
-	int err;
-
-	if (count % 8)
-		return -EINVAL;	/* Invalid chunk size */
-
-	for (rv = 0; count; count -= 8) {
-		if (copy_from_user(&data, tmp, 8))
-			return -EFAULT;
-		err = do_wrmsr(cpu, reg, data[0], data[1]);
-		if (err)
-			return err;
-		tmp += 2;
-	}
-
-	return ((char __user *)tmp) - buf;
-}
-
-static int msr_open(struct inode *inode, struct file *file)
-{
-	unsigned int cpu = iminor(file->f_dentry->d_inode);
-	struct cpuinfo_x86 *c = &(cpu_data)[cpu];
-
-	if (cpu >= NR_CPUS || !cpu_online(cpu))
-		return -ENXIO;	/* No such CPU */
-	if (!cpu_has(c, X86_FEATURE_MSR))
-		return -EIO;	/* MSR not supported */
-
-	return 0;
-}
-
-/*
- * File operations we support
- */
-static struct file_operations msr_fops = {
-	.owner = THIS_MODULE,
-	.llseek = msr_seek,
-	.read = msr_read,
-	.write = msr_write,
-	.open = msr_open,
-};
-
-static int __init msr_init(void)
-{
-	if (register_chrdev(MSR_MAJOR, "cpu/msr", &msr_fops)) {
-		printk(KERN_ERR "msr: unable to get major %d for msr\n",
-		       MSR_MAJOR);
-		return -EBUSY;
-	}
-
-	return 0;
-}
-
-static void __exit msr_exit(void)
-{
-	unregister_chrdev(MSR_MAJOR, "cpu/msr");
-}
-
-module_init(msr_init);
-module_exit(msr_exit)
-
-MODULE_AUTHOR("H. Peter Anvin <hpa@zytor.com>");
-MODULE_DESCRIPTION("x86 generic MSR driver");
-MODULE_LICENSE("GPL");
diff --git a/include/asm-x86_64/msr.h b/include/asm-x86_64/msr.h
index 15a6ef7cf3d..4d727f3f555 100644
--- a/include/asm-x86_64/msr.h
+++ b/include/asm-x86_64/msr.h
@@ -29,22 +29,37 @@
 #define wrmsrl(msr,val) wrmsr(msr,(__u32)((__u64)(val)),((__u64)(val))>>32) 
 
 /* wrmsr with exception handling */
-#define wrmsr_safe(msr,a,b) ({ int ret__;						\
-	asm volatile("2: wrmsr ; xorl %0,%0\n"						\
-		     "1:\n\t"								\
-		     ".section .fixup,\"ax\"\n\t"					\
-		     "3:  movl %4,%0 ; jmp 1b\n\t"					\
-		     ".previous\n\t"							\
- 		     ".section __ex_table,\"a\"\n"					\
-		     "   .align 8\n\t"							\
-		     "   .quad 	2b,3b\n\t"						\
-		     ".previous"							\
-		     : "=a" (ret__)							\
-		     : "c" (msr), "0" (a), "d" (b), "i" (-EFAULT));\
+#define wrmsr_safe(msr,a,b) ({ int ret__;			\
+	asm volatile("2: wrmsr ; xorl %0,%0\n"			\
+		     "1:\n\t"					\
+		     ".section .fixup,\"ax\"\n\t"		\
+		     "3:  movl %4,%0 ; jmp 1b\n\t"		\
+		     ".previous\n\t"				\
+ 		     ".section __ex_table,\"a\"\n"		\
+		     "   .align 8\n\t"				\
+		     "   .quad 	2b,3b\n\t"			\
+		     ".previous"				\
+		     : "=a" (ret__)				\
+		     : "c" (msr), "0" (a), "d" (b), "i" (-EFAULT)); \
 	ret__; })
 
 #define checking_wrmsrl(msr,val) wrmsr_safe(msr,(u32)(val),(u32)((val)>>32))
 
+#define rdmsr_safe(msr,a,b) \
+	({ int ret__;						\
+	  asm volatile ("1:       rdmsr\n"			\
+                      "2:\n"					\
+                      ".section .fixup,\"ax\"\n"		\
+                      "3:       movl %4,%0\n"			\
+                      " jmp 2b\n"				\
+                      ".previous\n"				\
+                      ".section __ex_table,\"a\"\n"		\
+                      " .align 8\n"				\
+                      " .quad 1b,3b\n"				\
+                      ".previous":"=&bDS" (ret__), "=a"(a), "=d"(b)\
+                      :"c"(msr), "i"(-EIO), "0"(0));		\
+	  ret__; })		
+
 #define rdtsc(low,high) \
      __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))