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-rw-r--r--arch/i386/kernel/microcode.c125
1 files changed, 89 insertions, 36 deletions
diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c
index f858d7da9..989f70c7e 100644
--- a/arch/i386/kernel/microcode.c
+++ b/arch/i386/kernel/microcode.c
@@ -25,6 +25,11 @@
* and frees the saved copy of applied microcode.
* 1.03 29 February 2000, Tigran Aivazian <tigran@sco.com>
* Made to use devfs (/dev/cpu/microcode) + cleanups.
+ * 1.04 06 June 2000, Simon Trimmer <simon@veritas.com>
+ * Added misc device support (now uses both devfs and misc).
+ * Added MICROCODE_IOCFREE ioctl to clear memory.
+ * 1.05 09 June 2000, Simon Trimmer <simon@veritas.com>
+ * Messages for error cases (non intel & no suitable microcode).
*/
#include <linux/init.h>
@@ -33,16 +38,17 @@
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/smp_lock.h>
+#include <linux/miscdevice.h>
#include <linux/devfs_fs_kernel.h>
#include <asm/msr.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
-#define MICROCODE_VERSION "1.03"
+#define MICROCODE_VERSION "1.05"
-MODULE_DESCRIPTION("CPU (P6) microcode update driver");
-MODULE_AUTHOR("Tigran Aivazian <tigran@ocston.org>");
+MODULE_DESCRIPTION("Intel CPU (P6) microcode update driver");
+MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
EXPORT_NO_SYMBOLS;
/* VFS interface */
@@ -50,6 +56,7 @@ static int microcode_open(struct inode *, struct file *);
static int microcode_release(struct inode *, struct file *);
static ssize_t microcode_read(struct file *, char *, size_t, loff_t *);
static ssize_t microcode_write(struct file *, const char *, size_t, loff_t *);
+static int microcode_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
/* internal helpers to do the work */
@@ -60,43 +67,62 @@ static void do_update_one(void *);
* Bits in microcode_status. (31 bits of room for future expansion)
*/
#define MICROCODE_IS_OPEN 0 /* set if device is in use */
-static unsigned long microcode_status = 0;
+
+static unsigned long microcode_status;
/* the actual array of microcode blocks, each 2048 bytes */
-static struct microcode *microcode = NULL;
-static unsigned int microcode_num = 0;
-static char *mc_applied = NULL; /* holds an array of applied microcode blocks */
-static unsigned int mc_fsize; /* used often, so compute once at microcode_init() */
+static struct microcode *microcode;
+static unsigned int microcode_num;
+static char *mc_applied; /* holds an array of applied microcode blocks */
+static unsigned int mc_fsize;
static struct file_operations microcode_fops = {
+ owner: THIS_MODULE,
read: microcode_read,
write: microcode_write,
+ ioctl: microcode_ioctl,
open: microcode_open,
release: microcode_release,
};
+static struct miscdevice microcode_dev = {
+ minor: MICROCODE_MINOR,
+ name: "microcode",
+ fops: &microcode_fops,
+};
+
static devfs_handle_t devfs_handle;
static int __init microcode_init(void)
{
- devfs_handle = devfs_register(NULL, "cpu/microcode", 0, DEVFS_FL_DEFAULT, 0, 0,
- S_IFREG | S_IRUSR | S_IWUSR, 0, 0, &microcode_fops, NULL);
- if (!devfs_handle) {
- printk(KERN_ERR "microcode: can't create /dev/cpu/microcode\n");
- return -ENOMEM;
- }
- /* XXX assume no hotplug CPUs so smp_num_cpus does not change */
- mc_fsize = smp_num_cpus * sizeof(struct microcode);
- printk(KERN_INFO "P6 Microcode Update Driver v%s registered\n", MICROCODE_VERSION);
+ int error = 0;
+
+ if (misc_register(&microcode_dev) < 0) {
+ printk(KERN_WARNING
+ "microcode: can't misc_register on minor=%d\n",
+ MICROCODE_MINOR);
+ error = 1;
+ }
+ devfs_handle = devfs_register(NULL, "cpu/microcode", 0,
+ DEVFS_FL_DEFAULT, 0, 0, S_IFREG | S_IRUSR | S_IWUSR,
+ 0, 0, &microcode_fops, NULL);
+ if (devfs_handle == NULL && error) {
+ printk(KERN_ERR "microcode: failed to devfs_register()\n");
+ return -EINVAL;
+ }
+ printk(KERN_INFO "P6 Microcode Update Driver v%s registered\n",
+ MICROCODE_VERSION);
return 0;
}
static void __exit microcode_exit(void)
{
+ misc_deregister(&microcode_dev);
devfs_unregister(devfs_handle);
if (mc_applied)
kfree(mc_applied);
- printk(KERN_INFO "P6 Microcode Update Driver v%s unregistered\n", MICROCODE_VERSION);
+ printk(KERN_INFO "P6 Microcode Update Driver v%s unregistered\n",
+ MICROCODE_VERSION);
}
module_init(microcode_init);
@@ -114,25 +140,16 @@ static int microcode_open(struct inode *inode, struct file *file)
if (test_and_set_bit(MICROCODE_IS_OPEN, &microcode_status))
return -EBUSY;
- if ((file->f_flags & O_ACCMODE) == O_WRONLY && mc_applied) {
- devfs_set_file_size(devfs_handle, 0);
- memset(mc_applied, 0, mc_fsize);
- kfree(mc_applied);
- mc_applied = NULL;
- }
-
- MOD_INC_USE_COUNT;
return 0;
}
static int microcode_release(struct inode *inode, struct file *file)
{
clear_bit(MICROCODE_IS_OPEN, &microcode_status);
- MOD_DEC_USE_COUNT;
return 0;
}
-/* a pointer to 'struct update_req' is passed to the IPI hanlder = do_update_one()
+/* a pointer to 'struct update_req' is passed to the IPI handler = do_update_one()
* update_req[cpu].err is set to 1 if update failed on 'cpu', 0 otherwise
* if err==0, microcode[update_req[cpu].slot] points to applied block of microcode
*/
@@ -167,12 +184,14 @@ static void do_update_one(void *arg)
struct cpuinfo_x86 *c = cpu_data + cpu_num;
struct update_req *req = (struct update_req *)arg + cpu_num;
unsigned int pf = 0, val[2], rev, sig;
- int i;
+ int i,found=0;
req->err = 1; /* be pessimistic */
- if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6)
+ if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6){
+ printk(KERN_ERR "microcode: CPU%d not an Intel P6\n", cpu_num );
return;
+ }
sig = c->x86_mask + (c->x86_model<<4) + (c->x86<<8);
@@ -186,6 +205,8 @@ static void do_update_one(void *arg)
if (microcode[i].sig == sig && microcode[i].pf == pf &&
microcode[i].ldrver == 1 && microcode[i].hdrver == 1) {
+ found=1;
+
rdmsr(0x8B, val[0], rev);
if (microcode[i].rev <= rev) {
printk(KERN_ERR
@@ -205,7 +226,7 @@ static void do_update_one(void *arg)
}
wrmsr(0x79, (unsigned int)(m->bits), 0);
- __asm__ __volatile__ ("cpuid");
+ __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx", "cc");
rdmsr(0x8B, val[0], val[1]);
req->err = 0;
@@ -216,6 +237,9 @@ static void do_update_one(void *arg)
}
break;
}
+
+ if(!found)
+ printk(KERN_ERR "microcode: found no data for CPU%d (sig=%x, pflags=%d)\n", cpu_num, sig, pf);
}
static ssize_t microcode_read(struct file *file, char *buf, size_t len, loff_t *ppos)
@@ -240,7 +264,8 @@ static ssize_t microcode_write(struct file *file, const char *buf, size_t len, l
return -EINVAL;
}
if (!mc_applied) {
- mc_applied = kmalloc(mc_fsize, GFP_KERNEL);
+ mc_applied = kmalloc(smp_num_cpus*sizeof(struct microcode),
+ GFP_KERNEL);
if (!mc_applied) {
printk(KERN_ERR "microcode: out of memory for saved microcode\n");
return -ENOMEM;
@@ -257,17 +282,45 @@ static ssize_t microcode_write(struct file *file, const char *buf, size_t len, l
}
if (copy_from_user(microcode, buf, len)) {
ret = -EFAULT;
- goto out_vfree;
+ goto out_fsize;
}
if(do_microcode_update()) {
ret = -EIO;
- goto out_vfree;
+ goto out_fsize;
+ } else {
+ mc_fsize = smp_num_cpus * sizeof(struct microcode);
+ ret = (ssize_t)len;
}
+out_fsize:
devfs_set_file_size(devfs_handle, mc_fsize);
- ret = (ssize_t)len;
-out_vfree:
vfree(microcode);
out_unlock:
unlock_kernel();
return ret;
}
+
+static int microcode_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ switch(cmd) {
+ case MICROCODE_IOCFREE:
+ if (mc_applied) {
+ devfs_set_file_size(devfs_handle, 0);
+ memset(mc_applied, 0, mc_fsize);
+ kfree(mc_applied);
+ mc_applied = NULL;
+ printk(KERN_WARNING
+ "microcode: freed %d bytes\n", mc_fsize);
+ mc_fsize = 0;
+ return 0;
+ }
+ return -ENODATA;
+
+ default:
+ printk(KERN_ERR "microcode: unknown ioctl cmd=%d\n",
+ cmd);
+ return -EINVAL;
+ }
+ /* NOT REACHED */
+ return -EINVAL;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 11:11:44 +0000