patch-2.4.25 linux-2.4.25/arch/i386/kernel/microcode.c
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- Lines: 722
- Date:
2004-02-18 05:36:30.000000000 -0800
- Orig file:
linux-2.4.24/arch/i386/kernel/microcode.c
- Orig date:
2003-06-13 07:51:29.000000000 -0700
diff -urN linux-2.4.24/arch/i386/kernel/microcode.c linux-2.4.25/arch/i386/kernel/microcode.c
@@ -57,351 +57,456 @@
* nature of implementation.
* 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
* Fix the panic when writing zero-length microcode chunk.
+ * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
+ * Jun Nakajima <jun.nakajima@intel.com>
+ * Support for the microcode updates in the new format.
+ * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
+ * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
+ * because we no longer hold a copy of applied microcode
+ * in kernel memory.
*/
+
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/miscdevice.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/spinlock.h>
+#include <linux/mm.h>
#include <asm/msr.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
-
-static spinlock_t microcode_update_lock = SPIN_LOCK_UNLOCKED;
-
-#define MICROCODE_VERSION "1.11"
-
MODULE_DESCRIPTION("Intel CPU (IA-32) microcode update driver");
MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
MODULE_LICENSE("GPL");
-EXPORT_NO_SYMBOLS;
-
-#define MICRO_DEBUG 0
+#define MICROCODE_VERSION "1.13"
+#define MICRO_DEBUG 1
#if MICRO_DEBUG
-#define printf(x...) printk(##x)
+#define dprintk(x...) printk(KERN_INFO x)
#else
-#define printf(x...)
+#define dprintk(x...)
#endif
-/* VFS interface */
-static int microcode_open(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);
-
-static int do_microcode_update(void);
-static void do_update_one(void *);
-
-/* read()/write()/ioctl() are serialized on this */
-static DECLARE_RWSEM(microcode_rwsem);
-
-static struct microcode *microcode; /* array of 2048byte microcode blocks */
-static unsigned int microcode_num; /* number of chunks in microcode */
-static char *mc_applied; /* array of applied microcode blocks */
-static unsigned int mc_fsize; /* file size of /dev/cpu/microcode */
+#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
+#define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
+#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
+#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
+#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
+#define DWSIZE (sizeof (u32))
+#define get_totalsize(mc) \
+ (((microcode_t *)mc)->hdr.totalsize ? \
+ ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
+#define get_datasize(mc) \
+ (((microcode_t *)mc)->hdr.datasize ? \
+ ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
+#define sigmatch(s1, s2, p1, p2) (((s1) == (s2)) && ((p1) & (p2)))
+#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
-/* we share file_operations between misc and devfs mechanisms */
-static struct file_operations microcode_fops = {
- owner: THIS_MODULE,
- read: microcode_read,
- write: microcode_write,
- ioctl: microcode_ioctl,
- open: microcode_open,
-};
+/* serialize access to the physical write to MSR 0x79 */
+static spinlock_t microcode_update_lock = SPIN_LOCK_UNLOCKED;
-static struct miscdevice microcode_dev = {
- minor: MICROCODE_MINOR,
- name: "microcode",
- fops: µcode_fops,
-};
+/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
+static DECLARE_MUTEX(microcode_sem);
-static devfs_handle_t devfs_handle;
+static void *user_buffer; /* user area microcode data buffer */
+static unsigned int user_buffer_size; /* it's size */
-static int __init microcode_init(void)
+typedef enum mc_error_code {
+ MC_SUCCESS = 0,
+ MC_NOTFOUND = 1,
+ MC_MARKED = 2,
+ MC_ALLOCATED = 3,
+} mc_error_code_t;
+
+static struct ucode_cpu_info {
+ unsigned int sig;
+ unsigned int pf;
+ unsigned int rev;
+ unsigned int cksum;
+ mc_error_code_t err;
+ microcode_t *mc;
+} ucode_cpu_info[NR_CPUS];
+
+static int microcode_open (struct inode *unused1, struct file *unused2)
{
- int error;
+ return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
+}
- error = misc_register(µcode_dev);
- if (error)
- printk(KERN_WARNING
- "microcode: can't misc_register on minor=%d\n",
- MICROCODE_MINOR);
+static void collect_cpu_info (void *unused)
+{
+ int cpu_num = smp_processor_id();
+ struct cpuinfo_x86 *c = cpu_data + cpu_num;
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+ unsigned int val[2];
+
+ uci->sig = uci->pf = uci->rev = uci->cksum = 0;
+ uci->err = MC_NOTFOUND;
+ uci->mc = NULL;
+
+ if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
+ cpu_has(c, X86_FEATURE_IA64)) {
+ printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
+ return;
+ } else {
+ uci->sig = cpuid_eax(0x00000001);
- devfs_handle = devfs_register(NULL, "cpu/microcode",
- DEVFS_FL_DEFAULT, 0, 0, S_IFREG | S_IRUSR | S_IWUSR,
- µcode_fops, NULL);
- if (devfs_handle == NULL && error) {
- printk(KERN_ERR "microcode: failed to devfs_register()\n");
+ if ((c->x86_model >= 5) || (c->x86 > 6)) {
+ /* get processor flags from MSR 0x17 */
+ rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
+ uci->pf = 1 << ((val[1] >> 18) & 7);
+ }
+ }
+
+ wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+ __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+ /* get the current revision from MSR 0x8B */
+ rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
+ dprintk("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
+ uci->sig, uci->pf, uci->rev);
+}
+
+static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_header, int sig, int pf, int cksum)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+
+ dprintk("Microcode Found.\n");
+ dprintk(" Header Revision 0x%x\n", mc_header->hdrver);
+ dprintk(" Loader Revision 0x%x\n", mc_header->ldrver);
+ dprintk(" Revision 0x%x \n", mc_header->rev);
+ dprintk(" Date %x/%x/%x\n",
+ ((mc_header->date >> 24 ) & 0xff),
+ ((mc_header->date >> 16 ) & 0xff),
+ (mc_header->date & 0xFFFF));
+ dprintk(" Signature 0x%x\n", sig);
+ dprintk(" Type 0x%x Family 0x%x Model 0x%x Stepping 0x%x\n",
+ ((sig >> 12) & 0x3),
+ ((sig >> 8) & 0xf),
+ ((sig >> 4) & 0xf),
+ ((sig & 0xf)));
+ dprintk(" Processor Flags 0x%x\n", pf);
+ dprintk(" Checksum 0x%x\n", cksum);
+
+ if (mc_header->rev < uci->rev) {
+ printk(KERN_ERR "microcode: CPU%d not 'upgrading' to earlier revision"
+ " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
+ goto out;
+ } else if (mc_header->rev == uci->rev) {
+ /* notify the caller of success on this cpu */
+ uci->err = MC_SUCCESS;
+ printk(KERN_ERR "microcode: CPU%d already at revision"
+ " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
goto out;
}
- error = 0;
- printk(KERN_INFO
- "IA-32 Microcode Update Driver: v%s <tigran@veritas.com>\n",
- MICROCODE_VERSION);
+ dprintk("microcode: CPU%d found a matching microcode update with "
+ " revision 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
+ uci->cksum = cksum;
+ uci->pf = pf; /* keep the original mc pf for cksum calculation */
+ uci->err = MC_MARKED; /* found the match */
out:
- return error;
+ return;
}
-static void __exit microcode_exit(void)
+static int find_matching_ucodes (void)
{
- misc_deregister(µcode_dev);
- devfs_unregister(devfs_handle);
- if (mc_applied)
- kfree(mc_applied);
- printk(KERN_INFO "IA-32 Microcode Update Driver v%s unregistered\n",
- MICROCODE_VERSION);
-}
+ int cursor = 0;
+ int error = 0;
-module_init(microcode_init)
-module_exit(microcode_exit)
+ while (cursor + MC_HEADER_SIZE < user_buffer_size) {
+ microcode_header_t mc_header;
+ void *newmc = NULL;
+ int i, sum, cpu_num, allocated_flag, total_size, data_size, ext_table_size;
+
+ if (copy_from_user(&mc_header, user_buffer + cursor, MC_HEADER_SIZE)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ error = -EFAULT;
+ goto out;
+ }
-static int microcode_open(struct inode *unused1, struct file *unused2)
-{
- return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
-}
+ total_size = get_totalsize(&mc_header);
+ if ((cursor + total_size > user_buffer_size) || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
+ printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
+ error = -EINVAL;
+ goto out;
+ }
-/*
- * 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
- */
-struct update_req {
- int err;
- int slot;
-} update_req[NR_CPUS];
+ data_size = get_datasize(&mc_header);
+ if ((data_size + MC_HEADER_SIZE > total_size) || (data_size < DEFAULT_UCODE_DATASIZE)) {
+ printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
+ error = -EINVAL;
+ goto out;
+ }
-static int do_microcode_update(void)
-{
- int i, error = 0, err;
- struct microcode *m;
+ if (mc_header.ldrver != 1 || mc_header.hdrver != 1) {
+ printk(KERN_ERR "microcode: error! Unknown microcode update format\n");
+ error = -EINVAL;
+ goto out;
+ }
+
+ for (cpu_num = 0; cpu_num < smp_num_cpus; cpu_num++) {
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+ if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
+ continue;
- if (smp_call_function(do_update_one, NULL, 1, 1) != 0) {
- printk(KERN_ERR "microcode: IPI timeout, giving up\n");
- return -EIO;
- }
- do_update_one(NULL);
+ if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
+ mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
+ }
- for (i=0; i<smp_num_cpus; i++) {
- err = update_req[i].err;
- error += err;
- if (!err) {
- m = (struct microcode *)mc_applied + i;
- memcpy(m, µcode[update_req[i].slot], sizeof(struct microcode));
+ ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
+ if (ext_table_size) {
+ struct extended_sigtable ext_header;
+ struct extended_signature ext_sig;
+ int ext_sigcount;
+
+ if ((ext_table_size < EXT_HEADER_SIZE)
+ || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
+ printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
+ error = -EINVAL;
+ goto out;
+ }
+ if (copy_from_user(&ext_header, user_buffer + cursor
+ + MC_HEADER_SIZE + data_size, EXT_HEADER_SIZE)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ error = -EFAULT;
+ goto out;
+ }
+ if (ext_table_size != exttable_size(&ext_header)) {
+ printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
+ error = -EFAULT;
+ goto out;
+ }
+
+ ext_sigcount = ext_header.count;
+
+ for (i = 0; i < ext_sigcount; i++) {
+ if (copy_from_user(&ext_sig, user_buffer + cursor + MC_HEADER_SIZE + data_size + EXT_HEADER_SIZE
+ + EXT_SIGNATURE_SIZE * i, EXT_SIGNATURE_SIZE)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ error = -EFAULT;
+ goto out;
+ }
+ for (cpu_num = 0; cpu_num < smp_num_cpus; cpu_num++) {
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+ if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
+ continue;
+ if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->pf)) {
+ mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
+ }
+ }
+ }
}
- }
+ /* now check if any cpu has matched */
+ for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < smp_num_cpus; cpu_num++) {
+ if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
+ if (!allocated_flag) {
+ allocated_flag = 1;
+ newmc = vmalloc(total_size);
+ if (!newmc) {
+ printk(KERN_ERR "microcode: error! Can not allocate memory\n");
+ error = -ENOMEM;
+ goto out;
+ }
+ if (copy_from_user(newmc + MC_HEADER_SIZE,
+ user_buffer + cursor + MC_HEADER_SIZE,
+ total_size - MC_HEADER_SIZE)) {
+ printk(KERN_ERR "microcode: error! Can not read user data\n");
+ vfree(newmc);
+ error = -EFAULT;
+ goto out;
+ }
+ memcpy(newmc, &mc_header, MC_HEADER_SIZE);
+ /* check extended table checksum */
+ if (ext_table_size) {
+ int * ext_tablep;
+ int ext_table_sum = 0;
+ i = ext_table_size / DWSIZE;
+ ext_tablep = (((void *) newmc) + MC_HEADER_SIZE + data_size);
+ while (i--) ext_table_sum += ext_tablep[i];
+ if (ext_table_sum) {
+ printk(KERN_WARNING "microcode: aborting, bad extended signature table checksum\n");
+ vfree(newmc);
+ error = -EINVAL;
+ goto out;
+ }
+ }
+
+ /* calculate the checksum */
+ i = (MC_HEADER_SIZE + data_size) / DWSIZE;
+ while (i--) sum += ((int *)newmc)[i];
+ sum -= (mc_header.sig + mc_header.pf + mc_header.cksum);
+ }
+ ucode_cpu_info[cpu_num].mc = newmc;
+ ucode_cpu_info[cpu_num].err = MC_ALLOCATED; /* mc updated */
+ if (sum + uci->sig + uci->pf + uci->cksum != 0) {
+ printk(KERN_ERR "microcode: CPU%d aborting, bad checksum\n", cpu_num);
+ error = -EINVAL;
+ goto out;
+ }
+ }
+ }
+ cursor += total_size; /* goto the next update patch */
+ } /* end of while */
+out:
return error;
}
-static void do_update_one(void *unused)
+static void do_update_one (void * unused)
{
- int cpu_num = smp_processor_id();
- struct cpuinfo_x86 *c = cpu_data + cpu_num;
- struct update_req *req = update_req + cpu_num;
- unsigned int pf = 0, val[2], rev, sig;
unsigned long flags;
- int i;
-
- req->err = 1; /* assume update will fail on this cpu */
+ unsigned int val[2];
+ int cpu_num = smp_processor_id();
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
- if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
- test_bit(X86_FEATURE_IA64, &c->x86_capability)){
- printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
+ if (uci->mc == NULL) {
+ printk(KERN_INFO "microcode: No suitable data for cpu %d\n", cpu_num);
return;
}
- sig = c->x86_mask + (c->x86_model<<4) + (c->x86<<8);
+ /* serialize access to the physical write to MSR 0x79 */
+ spin_lock_irqsave(µcode_update_lock, flags);
- if ((c->x86_model >= 5) || (c->x86 > 6)) {
- /* get processor flags from MSR 0x17 */
- rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
- pf = 1 << ((val[1] >> 18) & 7);
- }
-
- for (i=0; i<microcode_num; i++)
- if (microcode[i].sig == sig && microcode[i].pf == pf &&
- microcode[i].ldrver == 1 && microcode[i].hdrver == 1) {
- int sum = 0;
- struct microcode *m = µcode[i];
- unsigned int *sump = (unsigned int *)(m+1);
-
- printf("Microcode\n");
- printf(" Header Revision %d\n",microcode[i].hdrver);
- printf(" Date %x/%x/%x\n",
- ((microcode[i].date >> 24 ) & 0xff),
- ((microcode[i].date >> 16 ) & 0xff),
- (microcode[i].date & 0xFFFF));
- printf(" Type %x Family %x Model %x Stepping %x\n",
- ((microcode[i].sig >> 12) & 0x3),
- ((microcode[i].sig >> 8) & 0xf),
- ((microcode[i].sig >> 4) & 0xf),
- ((microcode[i].sig & 0xf)));
- printf(" Checksum %x\n",microcode[i].cksum);
- printf(" Loader Revision %x\n",microcode[i].ldrver);
- printf(" Processor Flags %x\n\n",microcode[i].pf);
-
- req->slot = i;
-
- /* serialize access to update decision */
- spin_lock_irqsave(µcode_update_lock, flags);
-
- /* trick, to work even if there was no prior update by the BIOS */
- wrmsr(MSR_IA32_UCODE_REV, 0, 0);
- __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+ /* write microcode via MSR 0x79 */
+ wrmsr(MSR_IA32_UCODE_WRITE, (unsigned int)(uci->mc->bits), 0);
+ wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+
+ __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+ /* get the current revision from MSR 0x8B */
+ rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
+
+ /* notify the caller of success on this cpu */
+ uci->err = MC_SUCCESS;
+ spin_unlock_irqrestore(µcode_update_lock, flags);
+ printk(KERN_INFO "microcode: CPU%d updated from revision "
+ "0x%x to 0x%x, date = %08x \n",
+ cpu_num, uci->rev, val[1], uci->mc->hdr.date);
+ return;
+}
- /* get current (on-cpu) revision into rev (ignore val[0]) */
- rdmsr(MSR_IA32_UCODE_REV, val[0], rev);
-
- if (microcode[i].rev < rev) {
- spin_unlock_irqrestore(µcode_update_lock, flags);
- printk(KERN_ERR
- "microcode: CPU%d not 'upgrading' to earlier revision"
- " %d (current=%d)\n", cpu_num, microcode[i].rev, rev);
- return;
- } else if (microcode[i].rev == rev) {
- /* notify the caller of success on this cpu */
- req->err = 0;
- spin_unlock_irqrestore(µcode_update_lock, flags);
- printk(KERN_ERR
- "microcode: CPU%d already at revision"
- " %d (current=%d)\n", cpu_num, microcode[i].rev, rev);
- return;
- }
+static int do_microcode_update (void)
+{
+ int i, error;
- /* Verify the checksum */
- while (--sump >= (unsigned int *)m)
- sum += *sump;
- if (sum != 0) {
- req->err = 1;
- spin_unlock_irqrestore(µcode_update_lock, flags);
- printk(KERN_ERR "microcode: CPU%d aborting, "
- "bad checksum\n", cpu_num);
- return;
- }
-
- /* write microcode via MSR 0x79 */
- wrmsr(MSR_IA32_UCODE_WRITE, (unsigned int)(m->bits), 0);
+ if (smp_call_function(collect_cpu_info, NULL, 1, 1) != 0) {
+ printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
+ error = -EIO;
+ goto out;
+ }
+ collect_cpu_info(NULL);
- /* serialize */
- __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+ if ((error = find_matching_ucodes())) {
+ printk(KERN_ERR "microcode: Error in the microcode data\n");
+ goto out_free;
+ }
- /* get the current revision from MSR 0x8B */
- rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
+ if (smp_call_function(do_update_one, NULL, 1, 1) != 0) {
+ printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
+ error = -EIO;
+ }
+ do_update_one(NULL);
- /* notify the caller of success on this cpu */
- req->err = 0;
- spin_unlock_irqrestore(µcode_update_lock, flags);
- printk(KERN_INFO "microcode: CPU%d updated from revision "
- "%d to %d, date=%08x\n",
- cpu_num, rev, val[1], microcode[i].date);
- return;
+out_free:
+ for (i = 0; i < smp_num_cpus; i++) {
+ if (ucode_cpu_info[i].mc) {
+ int j;
+ void *tmp = ucode_cpu_info[i].mc;
+ vfree(tmp);
+ for (j = i; j < smp_num_cpus; j++) {
+ if (ucode_cpu_info[j].mc == tmp)
+ ucode_cpu_info[j].mc = NULL;
+ }
}
-
- printk(KERN_ERR
- "microcode: CPU%d no microcode found! (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)
-{
- ssize_t ret = 0;
-
- down_read(µcode_rwsem);
- if (*ppos >= mc_fsize)
- goto out;
- if (*ppos + len > mc_fsize)
- len = mc_fsize - *ppos;
- ret = -EFAULT;
- if (copy_to_user(buf, mc_applied + *ppos, len))
- goto out;
- *ppos += len;
- ret = len;
+ }
out:
- up_read(µcode_rwsem);
- return ret;
+ return error;
}
-static ssize_t microcode_write(struct file *file, const char *buf, size_t len, loff_t *ppos)
+static ssize_t microcode_write (struct file *file, const char *buf, size_t len, loff_t *ppos)
{
ssize_t ret;
- if (!len || len % sizeof(struct microcode) != 0) {
- printk(KERN_ERR "microcode: can only write in N*%d bytes units\n",
- sizeof(struct microcode));
+ if (len < DEFAULT_UCODE_TOTALSIZE) {
+ printk(KERN_ERR "microcode: not enough data\n");
return -EINVAL;
}
+
if ((len >> PAGE_SHIFT) > num_physpages) {
printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
return -EINVAL;
}
- down_write(µcode_rwsem);
- if (!mc_applied) {
- mc_applied = kmalloc(smp_num_cpus*sizeof(struct microcode),
- GFP_KERNEL);
- if (!mc_applied) {
- up_write(µcode_rwsem);
- printk(KERN_ERR "microcode: out of memory for saved microcode\n");
- return -ENOMEM;
- }
- }
-
- microcode_num = len/sizeof(struct microcode);
- microcode = vmalloc(len);
- if (!microcode) {
- ret = -ENOMEM;
- goto out_unlock;
- }
-
- if (copy_from_user(microcode, buf, len)) {
- ret = -EFAULT;
- goto out_fsize;
- }
-
- if(do_microcode_update()) {
- ret = -EIO;
- goto out_fsize;
- } else {
- mc_fsize = smp_num_cpus * sizeof(struct microcode);
+
+ down(µcode_sem);
+
+ user_buffer = (void *) buf;
+ user_buffer_size = (int) len;
+
+ ret = do_microcode_update();
+ if (!ret)
ret = (ssize_t)len;
- }
-out_fsize:
- devfs_set_file_size(devfs_handle, mc_fsize);
- vfree(microcode);
-out_unlock:
- up_write(µcode_rwsem);
+
+ up(µcode_sem);
+
return ret;
}
-static int microcode_ioctl(struct inode *inode, struct file *file,
+static int microcode_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
- switch(cmd) {
+ switch (cmd) {
+ /*
+ * XXX: will be removed after microcode_ctl
+ * is updated to ignore failure of this ioctl()
+ */
case MICROCODE_IOCFREE:
- down_write(µcode_rwsem);
- if (mc_applied) {
- int bytes = smp_num_cpus * sizeof(struct microcode);
-
- devfs_set_file_size(devfs_handle, 0);
- kfree(mc_applied);
- mc_applied = NULL;
- printk(KERN_INFO "microcode: freed %d bytes\n", bytes);
- mc_fsize = 0;
- up_write(µcode_rwsem);
- return 0;
- }
- up_write(µcode_rwsem);
- return -ENODATA;
-
+ return 0;
default:
- printk(KERN_ERR "microcode: unknown ioctl cmd=%d\n", cmd);
return -EINVAL;
}
return -EINVAL;
}
+
+static struct file_operations microcode_fops = {
+ .owner = THIS_MODULE,
+ .write = microcode_write,
+ .ioctl = microcode_ioctl,
+ .open = microcode_open,
+};
+
+static struct miscdevice microcode_dev = {
+ .minor = MICROCODE_MINOR,
+ .name = "microcode",
+ .fops = µcode_fops,
+};
+
+static int __init microcode_init (void)
+{
+ int error;
+
+ error = misc_register(µcode_dev);
+ if (error) {
+ printk(KERN_ERR
+ "microcode: can't misc_register on minor=%d\n",
+ MICROCODE_MINOR);
+ return error;
+ }
+
+ printk(KERN_INFO
+ "IA-32 Microcode Update Driver: v%s <tigran@veritas.com>\n",
+ MICROCODE_VERSION);
+ return 0;
+}
+
+static void __exit microcode_exit (void)
+{
+ misc_deregister(µcode_dev);
+ printk(KERN_INFO "IA-32 Microcode Update Driver v%s unregistered\n",
+ MICROCODE_VERSION);
+}
+
+module_init(microcode_init)
+module_exit(microcode_exit)
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)