@@ -37,6 +37,16 @@
#include "internal.h"
+struct ucode_patch {
+ struct list_head plist;
+ void *data;
+ unsigned int size;
+ u32 patch_id;
+ u16 equiv_cpu;
+};
+
+static LIST_HEAD(microcode_cache);
+
#define UCODE_MAGIC 0x00414d44
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE 0x00000001
@@ -46,8 +46,6 @@ static bool dis_ucode_ldr = true;
bool initrd_gone;
-LIST_HEAD(microcode_cache);
-
/*
* Synchronization.
*
@@ -33,10 +33,10 @@
static const char ucode_path[] = "kernel/x86/microcode/GenuineIntel.bin";
/* Current microcode patch used in early patching on the APs. */
-static struct microcode_intel *intel_ucode_patch;
+static struct microcode_intel *intel_ucode_patch __read_mostly;
/* last level cache size per core */
-static int llc_size_per_core;
+static int llc_size_per_core __ro_after_init;
/* microcode format is extended from prescott processors */
struct extended_signature {
@@ -253,74 +253,17 @@ static int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev
return intel_find_matching_signature(mc, csig, cpf);
}
-static struct ucode_patch *memdup_patch(void *data, unsigned int size)
+static void save_microcode_patch(void *data, unsigned int size)
{
- struct ucode_patch *p;
-
- p = kzalloc(sizeof(struct ucode_patch), GFP_KERNEL);
- if (!p)
- return NULL;
-
- p->data = kmemdup(data, size, GFP_KERNEL);
- if (!p->data) {
- kfree(p);
- return NULL;
- }
-
- return p;
-}
-
-static void save_microcode_patch(struct ucode_cpu_info *uci, void *data, unsigned int size)
-{
- struct microcode_header_intel *mc_hdr, *mc_saved_hdr;
- struct ucode_patch *iter, *tmp, *p = NULL;
- bool prev_found = false;
- unsigned int sig, pf;
-
- mc_hdr = (struct microcode_header_intel *)data;
-
- list_for_each_entry_safe(iter, tmp, µcode_cache, plist) {
- mc_saved_hdr = (struct microcode_header_intel *)iter->data;
- sig = mc_saved_hdr->sig;
- pf = mc_saved_hdr->pf;
-
- if (intel_find_matching_signature(data, sig, pf)) {
- prev_found = true;
-
- if (mc_hdr->rev <= mc_saved_hdr->rev)
- continue;
-
- p = memdup_patch(data, size);
- if (!p)
- pr_err("Error allocating buffer %p\n", data);
- else {
- list_replace(&iter->plist, &p->plist);
- kfree(iter->data);
- kfree(iter);
- }
- }
- }
-
- /*
- * There weren't any previous patches found in the list cache; save the
- * newly found.
- */
- if (!prev_found) {
- p = memdup_patch(data, size);
- if (!p)
- pr_err("Error allocating buffer for %p\n", data);
- else
- list_add_tail(&p->plist, µcode_cache);
- }
+ struct microcode_header_intel *p;
+ p = kmemdup(data, size, GFP_KERNEL);
if (!p)
return;
- if (!intel_find_matching_signature(p->data, uci->cpu_sig.sig, uci->cpu_sig.pf))
- return;
-
+ kfree(intel_ucode_patch);
/* Save for early loading */
- intel_ucode_patch = p->data;
+ intel_ucode_patch = (struct microcode_intel *)p;
}
/*
@@ -332,6 +275,7 @@ scan_microcode(void *data, size_t size, struct ucode_cpu_info *uci, bool save)
{
struct microcode_header_intel *mc_header;
struct microcode_intel *patch = NULL;
+ u32 cur_rev = uci->cpu_sig.rev;
unsigned int mc_size;
while (size) {
@@ -341,8 +285,7 @@ scan_microcode(void *data, size_t size, struct ucode_cpu_info *uci, bool save)
mc_header = (struct microcode_header_intel *)data;
mc_size = get_totalsize(mc_header);
- if (!mc_size ||
- mc_size > size ||
+ if (!mc_size || mc_size > size ||
intel_microcode_sanity_check(data, false, MC_HEADER_TYPE_MICROCODE) < 0)
break;
@@ -354,31 +297,16 @@ scan_microcode(void *data, size_t size, struct ucode_cpu_info *uci, bool save)
continue;
}
- if (save) {
- save_microcode_patch(uci, data, mc_size);
+ /* BSP scan: Check whether there is newer microcode */
+ if (!save && cur_rev >= mc_header->rev)
goto next;
- }
-
-
- if (!patch) {
- if (!has_newer_microcode(data,
- uci->cpu_sig.sig,
- uci->cpu_sig.pf,
- uci->cpu_sig.rev))
- goto next;
- } else {
- struct microcode_header_intel *phdr = &patch->hdr;
-
- if (!has_newer_microcode(data,
- phdr->sig,
- phdr->pf,
- phdr->rev))
- goto next;
- }
+ /* Save scan: Check whether there is newer or matching microcode */
+ if (save && cur_rev != mc_header->rev)
+ goto next;
- /* We have a newer patch, save it. */
patch = data;
+ cur_rev = mc_header->rev;
next:
data += mc_size;
@@ -387,6 +315,9 @@ next:
if (size)
return NULL;
+ if (save && patch)
+ save_microcode_patch(patch, mc_size);
+
return patch;
}
@@ -528,26 +459,10 @@ void load_ucode_intel_ap(void)
apply_microcode_early(&uci);
}
-static struct microcode_intel *find_patch(struct ucode_cpu_info *uci)
+/* Accessor for microcode pointer */
+static struct microcode_intel *ucode_get_patch(void)
{
- struct microcode_header_intel *phdr;
- struct ucode_patch *iter, *tmp;
-
- list_for_each_entry_safe(iter, tmp, µcode_cache, plist) {
-
- phdr = (struct microcode_header_intel *)iter->data;
-
- if (phdr->rev <= uci->cpu_sig.rev)
- continue;
-
- if (!intel_find_matching_signature(phdr,
- uci->cpu_sig.sig,
- uci->cpu_sig.pf))
- continue;
-
- return iter->data;
- }
- return NULL;
+ return intel_ucode_patch;
}
void reload_ucode_intel(void)
@@ -557,7 +472,7 @@ void reload_ucode_intel(void)
intel_cpu_collect_info(&uci);
- p = find_patch(&uci);
+ p = ucode_get_patch();
if (!p)
return;
@@ -601,7 +516,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
return UCODE_ERROR;
/* Look for a newer patch in our cache: */
- mc = find_patch(uci);
+ mc = ucode_get_patch();
if (!mc) {
mc = uci->mc;
if (!mc)
@@ -730,7 +645,7 @@ static enum ucode_state generic_load_microcode(int cpu, struct iov_iter *iter)
uci->mc = (struct microcode_intel *)new_mc;
/* Save for CPU hotplug */
- save_microcode_patch(uci, new_mc, new_mc_size);
+ save_microcode_patch(new_mc, new_mc_size);
pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
cpu, new_rev, uci->cpu_sig.rev);
@@ -8,16 +8,6 @@
#include <asm/cpu.h>
#include <asm/microcode.h>
-struct ucode_patch {
- struct list_head plist;
- void *data; /* Intel uses only this one */
- unsigned int size;
- u32 patch_id;
- u16 equiv_cpu;
-};
-
-extern struct list_head microcode_cache;
-
struct device;
enum ucode_state {