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authorBorislav Petkov <borislav.petkov@amd.com>2011-12-02 17:16:55 +0100
committerBorislav Petkov <bp@amd64.org>2011-12-14 12:46:50 +0100
commit96b0ee4588036b6fa7cf38c17a9e40531241e895 (patch)
tree477c7a343310f21f6e2bb950ee1ee53c775bd809 /arch/x86/kernel/microcode_amd.c
parentf72c1a576565a4927d650218e183ab5053ab8c3a (diff)
downloadlinux-linaro-stable-96b0ee4588036b6fa7cf38c17a9e40531241e895.tar.gz
x86, microcode, AMD: Add a reusable buffer
Add a simple 4K page which gets allocated on driver init and freed on driver exit instead of vmalloc'ing small buffers for each ucode patch. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Diffstat (limited to 'arch/x86/kernel/microcode_amd.c')
-rw-r--r--arch/x86/kernel/microcode_amd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index e8a68c2a4364..9129c6981c5b 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -71,6 +71,9 @@ struct microcode_amd {
static struct equiv_cpu_entry *equiv_cpu_table;
+/* page-sized ucode patch buffer */
+void *patch;
+
static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
@@ -351,9 +354,14 @@ static struct microcode_ops microcode_amd_ops = {
struct microcode_ops * __init init_amd_microcode(void)
{
+ patch = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!patch)
+ return NULL;
+
return &microcode_amd_ops;
}
void __exit exit_amd_microcode(void)
{
+ free_page((unsigned long)patch);
}