x86/microcode_intel.h: Define functions and macros for early loading ucode
Define some functions and macros that will be used in early loading ucode. Some
of them are moved from microcode_intel.c driver in order to be called in early
boot phase before module can be called.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1356075872-3054-3-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 3544aed..5fb2ceb 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -79,7 +79,7 @@
#include <linux/module.h>
#include <linux/vmalloc.h>
-#include <asm/microcode.h>
+#include <asm/microcode_intel.h>
#include <asm/processor.h>
#include <asm/msr.h>
@@ -87,59 +87,6 @@
MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
MODULE_LICENSE("GPL");
-struct microcode_header_intel {
- unsigned int hdrver;
- unsigned int rev;
- unsigned int date;
- unsigned int sig;
- unsigned int cksum;
- unsigned int ldrver;
- unsigned int pf;
- unsigned int datasize;
- unsigned int totalsize;
- unsigned int reserved[3];
-};
-
-struct microcode_intel {
- struct microcode_header_intel hdr;
- unsigned int bits[0];
-};
-
-/* microcode format is extended from prescott processors */
-struct extended_signature {
- unsigned int sig;
- unsigned int pf;
- unsigned int cksum;
-};
-
-struct extended_sigtable {
- unsigned int count;
- unsigned int cksum;
- unsigned int reserved[3];
- struct extended_signature sigs[0];
-};
-
-#define DEFAULT_UCODE_DATASIZE (2000)
-#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
-#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
-#define EXT_HEADER_SIZE (sizeof(struct extended_sigtable))
-#define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature))
-#define DWSIZE (sizeof(u32))
-
-#define get_totalsize(mc) \
- (((struct microcode_intel *)mc)->hdr.totalsize ? \
- ((struct microcode_intel *)mc)->hdr.totalsize : \
- DEFAULT_UCODE_TOTALSIZE)
-
-#define get_datasize(mc) \
- (((struct microcode_intel *)mc)->hdr.datasize ? \
- ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
-
-#define sigmatch(s1, s2, p1, p2) \
- (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
-
-#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
-
static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
{
struct cpuinfo_x86 *c = &cpu_data(cpu_num);
@@ -162,128 +109,25 @@
return 0;
}
-static inline int update_match_cpu(struct cpu_signature *csig, int sig, int pf)
-{
- return (!sigmatch(sig, csig->sig, pf, csig->pf)) ? 0 : 1;
-}
-
-static inline int
-update_match_revision(struct microcode_header_intel *mc_header, int rev)
-{
- return (mc_header->rev <= rev) ? 0 : 1;
-}
-
-static int microcode_sanity_check(void *mc)
-{
- unsigned long total_size, data_size, ext_table_size;
- struct microcode_header_intel *mc_header = mc;
- struct extended_sigtable *ext_header = NULL;
- int sum, orig_sum, ext_sigcount = 0, i;
- struct extended_signature *ext_sig;
-
- total_size = get_totalsize(mc_header);
- data_size = get_datasize(mc_header);
-
- if (data_size + MC_HEADER_SIZE > total_size) {
- pr_err("error! Bad data size in microcode data file\n");
- return -EINVAL;
- }
-
- if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
- 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)) {
- 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)) {
- pr_err("error! Bad exttable size in microcode data file\n");
- return -EFAULT;
- }
- ext_sigcount = ext_header->count;
- }
-
- /* check extended table checksum */
- if (ext_table_size) {
- int ext_table_sum = 0;
- int *ext_tablep = (int *)ext_header;
-
- i = ext_table_size / DWSIZE;
- while (i--)
- ext_table_sum += ext_tablep[i];
- if (ext_table_sum) {
- pr_warning("aborting, bad extended signature table checksum\n");
- return -EINVAL;
- }
- }
-
- /* calculate the checksum */
- orig_sum = 0;
- i = (MC_HEADER_SIZE + data_size) / DWSIZE;
- while (i--)
- orig_sum += ((int *)mc)[i];
- if (orig_sum) {
- pr_err("aborting, bad checksum\n");
- return -EINVAL;
- }
- if (!ext_table_size)
- return 0;
- /* check extended signature checksum */
- for (i = 0; i < ext_sigcount; i++) {
- ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
- EXT_SIGNATURE_SIZE * i;
- sum = orig_sum
- - (mc_header->sig + mc_header->pf + mc_header->cksum)
- + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
- if (sum) {
- pr_err("aborting, bad checksum\n");
- return -EINVAL;
- }
- }
- return 0;
-}
-
/*
* return 0 - no update found
* return 1 - found update
*/
-static int
-get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
+static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
{
- struct microcode_header_intel *mc_header = mc;
- struct extended_sigtable *ext_header;
- unsigned long total_size = get_totalsize(mc_header);
- int ext_sigcount, i;
- struct extended_signature *ext_sig;
+ struct cpu_signature cpu_sig;
+ unsigned int csig, cpf, crev;
- if (!update_match_revision(mc_header, rev))
- return 0;
+ collect_cpu_info(cpu, &cpu_sig);
- if (update_match_cpu(cpu_sig, mc_header->sig, mc_header->pf))
- return 1;
+ csig = cpu_sig.sig;
+ cpf = cpu_sig.pf;
+ crev = cpu_sig.rev;
- /* Look for ext. headers: */
- if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
- return 0;
-
- ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
- ext_sigcount = ext_header->count;
- ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
-
- for (i = 0; i < ext_sigcount; i++) {
- if (update_match_cpu(cpu_sig, ext_sig->sig, ext_sig->pf))
- return 1;
- ext_sig++;
- }
- return 0;
+ return get_matching_microcode(csig, cpf, mc_intel, crev);
}
-static int apply_microcode(int cpu)
+int apply_microcode(int cpu)
{
struct microcode_intel *mc_intel;
struct ucode_cpu_info *uci;
@@ -300,6 +144,14 @@
if (mc_intel == NULL)
return 0;
+ /*
+ * Microcode on this CPU could be updated earlier. Only apply the
+ * microcode patch in mc_intel when it is newer than the one on this
+ * CPU.
+ */
+ if (get_matching_mc(mc_intel, cpu) == 0)
+ return 0;
+
/* write microcode via MSR 0x79 */
wrmsr(MSR_IA32_UCODE_WRITE,
(unsigned long) mc_intel->bits,
@@ -338,6 +190,7 @@
unsigned int leftover = size;
enum ucode_state state = UCODE_OK;
unsigned int curr_mc_size = 0;
+ unsigned int csig, cpf;
while (leftover) {
struct microcode_header_intel mc_header;
@@ -362,11 +215,13 @@
}
if (get_ucode_data(mc, ucode_ptr, mc_size) ||
- microcode_sanity_check(mc) < 0) {
+ microcode_sanity_check(mc, 1) < 0) {
break;
}
- if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
+ csig = uci->cpu_sig.sig;
+ cpf = uci->cpu_sig.pf;
+ if (get_matching_microcode(csig, cpf, mc, new_rev)) {
vfree(new_mc);
new_rev = mc_header.rev;
new_mc = mc;
@@ -393,6 +248,13 @@
vfree(uci->mc);
uci->mc = (struct microcode_intel *)new_mc;
+ /*
+ * If early loading microcode is supported, save this mc into
+ * permanent memory. So it will be loaded early when a CPU is hot added
+ * or resumes.
+ */
+ save_mc_for_early(new_mc);
+
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: