x86, microcode, AMD: Add a small, per-family patches cache

This is a trivial cache which collects all ucode patches for the current
family of CPUs on the system. If a newer patch appears due to the
container file being updated in userspace, we replace our cached version
with the new one.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344361461-10076-12-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 66 insertions, 1 deletions

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 03ed5af7053d..cacdc9a5ee49 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -78,12 +78,22 @@ static struct equiv_cpu_entry *equiv_cpu_table;
 /* page-sized ucode patch buffer */
 void *patch;
 
+struct ucode_patch {
+        struct list_head plist;
+        void *data;
+        u32 patch_id;
+        u16 equiv_cpu;
+};
+
+static LIST_HEAD(pcache);
+
 static u16 find_equiv_id(unsigned int cpu)
 {
         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
         int i = 0;
 
-        BUG_ON(equiv_cpu_table == NULL);
+        if (!equiv_cpu_table)
+                return 0;
 
         while (equiv_cpu_table[i].installed_cpu != 0) {
                 if (uci->cpu_sig.sig == equiv_cpu_table[i].installed_cpu)
@@ -108,6 +118,61 @@ static u32 find_cpu_family_by_equiv_cpu(u16 equiv_cpu)
         return 0;
 }
 
+/*
+ * a small, trivial cache of per-family ucode patches
+ */
+static struct ucode_patch *cache_find_patch(u16 equiv_cpu)
+{
+        struct ucode_patch *p;
+
+        list_for_each_entry(p, &pcache, plist)
+                if (p->equiv_cpu == equiv_cpu)
+                        return p;
+        return NULL;
+}
+
+static void update_cache(struct ucode_patch *new_patch)
+{
+        struct ucode_patch *p;
+
+        list_for_each_entry(p, &pcache, plist) {
+                if (p->equiv_cpu == new_patch->equiv_cpu) {
+                        if (p->patch_id >= new_patch->patch_id)
+                                /* we already have the latest patch */
+                                return;
+
+                        list_replace(&p->plist, &new_patch->plist);
+                        kfree(p->data);
+                        kfree(p);
+                        return;
+                }
+        }
+        /* no patch found, add it */
+        list_add_tail(&new_patch->plist, &pcache);
+}
+
+static void free_cache(void)
+{
+        struct ucode_patch *p;
+
+        list_for_each_entry_reverse(p, &pcache, plist) {
+                __list_del(p->plist.prev, p->plist.next);
+                kfree(p->data);
+                kfree(p);
+        }
+}
+
+static struct ucode_patch *find_patch(unsigned int cpu)
+{
+        u16 equiv_id;
+
+        equiv_id = find_equiv_id(cpu);
+        if (!equiv_id)
+                return NULL;
+
+        return cache_find_patch(equiv_id);
+}
+
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
         struct cpuinfo_x86 *c = &cpu_data(cpu);