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Diffstat (limited to 'arch/x86/kernel/microcode_intel.c')
-rw-r--r--arch/x86/kernel/microcode_intel.c79
1 files changed, 38 insertions, 41 deletions
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 0d334ddd0a9..1a1b606d3e9 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -12,7 +12,7 @@
* Software Developer's Manual
* Order Number 253668 or free download from:
*
- * http://developer.intel.com/design/pentium4/manuals/253668.htm
+ * http://developer.intel.com/Assets/PDF/manual/253668.pdf
*
* For more information, go to http://www.urbanmyth.org/microcode
*
@@ -70,6 +70,9 @@
* Fix sigmatch() macro to handle old CPUs with pf == 0.
* Thanks to Stuart Swales for pointing out this bug.
*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/firmware.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
@@ -146,8 +149,7 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
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);
+ pr_err("CPU%d not a capable Intel processor\n", cpu_num);
return -1;
}
@@ -165,8 +167,8 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
/* get the current revision from MSR 0x8B */
rdmsr(MSR_IA32_UCODE_REV, val[0], csig->rev);
- printk(KERN_INFO "microcode: CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
- cpu_num, csig->sig, csig->pf, csig->rev);
+ pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
+ cpu_num, csig->sig, csig->pf, csig->rev);
return 0;
}
@@ -194,28 +196,24 @@ static int microcode_sanity_check(void *mc)
data_size = get_datasize(mc_header);
if (data_size + MC_HEADER_SIZE > total_size) {
- printk(KERN_ERR "microcode: error! "
- "Bad data size in microcode data file\n");
+ pr_err("error! Bad data size in microcode data file\n");
return -EINVAL;
}
if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
- printk(KERN_ERR "microcode: error! "
- "Unknown microcode update format\n");
+ pr_err("error! Unknown microcode update format\n");
return -EINVAL;
}
ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
if (ext_table_size) {
if ((ext_table_size < EXT_HEADER_SIZE)
|| ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
- printk(KERN_ERR "microcode: error! "
- "Small exttable size in microcode data file\n");
+ pr_err("error! Small exttable size in microcode data file\n");
return -EINVAL;
}
ext_header = mc + MC_HEADER_SIZE + data_size;
if (ext_table_size != exttable_size(ext_header)) {
- printk(KERN_ERR "microcode: error! "
- "Bad exttable size in microcode data file\n");
+ pr_err("error! Bad exttable size in microcode data file\n");
return -EFAULT;
}
ext_sigcount = ext_header->count;
@@ -230,8 +228,7 @@ static int microcode_sanity_check(void *mc)
while (i--)
ext_table_sum += ext_tablep[i];
if (ext_table_sum) {
- printk(KERN_WARNING "microcode: aborting, "
- "bad extended signature table checksum\n");
+ pr_warning("aborting, bad extended signature table checksum\n");
return -EINVAL;
}
}
@@ -242,7 +239,7 @@ static int microcode_sanity_check(void *mc)
while (i--)
orig_sum += ((int *)mc)[i];
if (orig_sum) {
- printk(KERN_ERR "microcode: aborting, bad checksum\n");
+ pr_err("aborting, bad checksum\n");
return -EINVAL;
}
if (!ext_table_size)
@@ -255,7 +252,7 @@ static int microcode_sanity_check(void *mc)
- (mc_header->sig + mc_header->pf + mc_header->cksum)
+ (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
if (sum) {
- printk(KERN_ERR "microcode: aborting, bad checksum\n");
+ pr_err("aborting, bad checksum\n");
return -EINVAL;
}
}
@@ -327,13 +324,11 @@ static int apply_microcode(int cpu)
rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
if (val[1] != mc_intel->hdr.rev) {
- printk(KERN_ERR "microcode: CPU%d update "
- "to revision 0x%x failed\n",
- cpu_num, mc_intel->hdr.rev);
+ pr_err("CPU%d update to revision 0x%x failed\n",
+ cpu_num, mc_intel->hdr.rev);
return -1;
}
- printk(KERN_INFO "microcode: CPU%d updated to revision "
- "0x%x, date = %04x-%02x-%02x \n",
+ pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
cpu_num, val[1],
mc_intel->hdr.date & 0xffff,
mc_intel->hdr.date >> 24,
@@ -348,10 +343,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
int (*get_ucode_data)(void *, const void *, size_t))
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- u8 *ucode_ptr = data, *new_mc = NULL, *mc;
+ u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL;
int new_rev = uci->cpu_sig.rev;
unsigned int leftover = size;
enum ucode_state state = UCODE_OK;
+ unsigned int curr_mc_size = 0;
while (leftover) {
struct microcode_header_intel mc_header;
@@ -362,36 +358,39 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
mc_size = get_totalsize(&mc_header);
if (!mc_size || mc_size > leftover) {
- printk(KERN_ERR "microcode: error!"
- "Bad data in microcode data file\n");
+ pr_err("error! Bad data in microcode data file\n");
break;
}
- mc = vmalloc(mc_size);
- if (!mc)
- break;
+ /* For performance reasons, reuse mc area when possible */
+ if (!mc || mc_size > curr_mc_size) {
+ vfree(mc);
+ mc = vmalloc(mc_size);
+ if (!mc)
+ break;
+ curr_mc_size = mc_size;
+ }
if (get_ucode_data(mc, ucode_ptr, mc_size) ||
microcode_sanity_check(mc) < 0) {
- vfree(mc);
break;
}
if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
- if (new_mc)
- vfree(new_mc);
+ vfree(new_mc);
new_rev = mc_header.rev;
new_mc = mc;
- } else
- vfree(mc);
+ mc = NULL; /* trigger new vmalloc */
+ }
ucode_ptr += mc_size;
leftover -= mc_size;
}
+ vfree(mc);
+
if (leftover) {
- if (new_mc)
- vfree(new_mc);
+ vfree(new_mc);
state = UCODE_ERROR;
goto out;
}
@@ -401,13 +400,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
goto out;
}
- if (uci->mc)
- vfree(uci->mc);
+ vfree(uci->mc);
uci->mc = (struct microcode_intel *)new_mc;
- pr_debug("microcode: CPU%d found a matching microcode update with"
- " version 0x%x (current=0x%x)\n",
- cpu, new_rev, uci->cpu_sig.rev);
+ pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
+ cpu, new_rev, uci->cpu_sig.rev);
out:
return state;
}
@@ -429,7 +426,7 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device)
c->x86, c->x86_model, c->x86_mask);
if (request_firmware(&firmware, name, device)) {
- pr_debug("microcode: data file %s load failed\n", name);
+ pr_debug("data file %s load failed\n", name);
return UCODE_NFOUND;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-25 15:44:19 +0000