1 files changed, 49 insertions, 24 deletions

diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c
index e7c138f66c5..0a865889b2a 100644
--- a/arch/i386/kernel/microcode.c
+++ b/arch/i386/kernel/microcode.c
@@ -91,7 +91,10 @@ MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
 MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
 MODULE_LICENSE("GPL");
 
-#define MICROCODE_VERSION 	"1.14"
+static int verbose;
+module_param(verbose, int, 0644);
+
+#define MICROCODE_VERSION 	"1.14a"
 
 #define DEFAULT_UCODE_DATASIZE 	(2000) 	  /* 2000 bytes */
 #define MC_HEADER_SIZE		(sizeof (microcode_header_t))  	  /* 48 bytes */
@@ -122,14 +125,15 @@ static unsigned int user_buffer_size;	/* it's size */
 
 typedef enum mc_error_code {
 	MC_SUCCESS 	= 0,
-	MC_NOTFOUND 	= 1,
-	MC_MARKED 	= 2,
-	MC_ALLOCATED 	= 3,
+	MC_IGNORED 	= 1,
+	MC_NOTFOUND 	= 2,
+	MC_MARKED 	= 3,
+	MC_ALLOCATED 	= 4,
 } mc_error_code_t;
 
 static struct ucode_cpu_info {
 	unsigned int sig;
-	unsigned int pf;
+	unsigned int pf, orig_pf;
 	unsigned int rev;
 	unsigned int cksum;
 	mc_error_code_t err;
@@ -164,6 +168,7 @@ static void collect_cpu_info (void *unused)
 			rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 			uci->pf = 1 << ((val[1] >> 18) & 7);
 		}
+		uci->orig_pf = uci->pf;
 	}
 
 	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
@@ -197,21 +202,34 @@ static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_he
 	pr_debug("   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;
+		if (uci->err == MC_NOTFOUND) {
+			uci->err = MC_IGNORED;
+			uci->cksum = mc_header->rev;
+		} else if (uci->err == MC_IGNORED && uci->cksum < mc_header->rev)
+			uci->cksum = mc_header->rev;
 	} else if (mc_header->rev == uci->rev) {
-		/* notify the caller of success on this cpu */
-		uci->err = MC_SUCCESS;
-		goto out;
+		if (uci->err < MC_MARKED) {
+			/* notify the caller of success on this cpu */
+			uci->err = MC_SUCCESS;
+		}
+	} else if (uci->err != MC_ALLOCATED || mc_header->rev > uci->mc->hdr.rev) {
+		pr_debug("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 */
+		for_each_online_cpu(cpu_num) {
+			if (ucode_cpu_info + cpu_num != uci
+			    && ucode_cpu_info[cpu_num].mc == uci->mc) {
+				uci->mc = NULL;
+				break;
+			}
+		}
+		if (uci->mc != NULL) {
+			vfree(uci->mc);
+			uci->mc = NULL;
+		}
 	}
-
-	pr_debug("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;
 }
 
@@ -253,10 +271,8 @@ static int find_matching_ucodes (void)
 
 		for_each_online_cpu(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(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
+			if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->orig_pf))
 				mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
 		}
 
@@ -295,9 +311,8 @@ static int find_matching_ucodes (void)
 				}
 				for_each_online_cpu(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)) {
+
+					if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->orig_pf)) {
 						mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
 					}
 				}
@@ -368,6 +383,13 @@ static void do_update_one (void * unused)
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 
 	if (uci->mc == NULL) {
+		if (verbose) {
+			if (uci->err == MC_SUCCESS)
+				printk(KERN_INFO "microcode: CPU%d already at revision 0x%x\n",
+					cpu_num, uci->rev);
+			else
+				printk(KERN_INFO "microcode: No new microcode data for CPU%d\n", cpu_num);
+		}
 		return;
 	}
 
@@ -426,6 +448,9 @@ out_free:
 					ucode_cpu_info[j].mc = NULL;
 			}
 		}
+		if (ucode_cpu_info[i].err == MC_IGNORED && verbose)
+			printk(KERN_WARNING "microcode: CPU%d not 'upgrading' to earlier revision"
+			       " 0x%x (current=0x%x)\n", i, ucode_cpu_info[i].cksum, ucode_cpu_info[i].rev);
 	}
 out:
 	return error;