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Date: Fri, 22 Jan 2010 21:34:56 +0100
From: Andreas Herrmann <herrmann.der.user@...glemail.com>
To: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>
Cc: Gene Heskett <gene.heskett@...izon.net>,
linux-kernel@...r.kernel.org
Subject: [PATCH] Revert "x86: ucode-amd: Load ucode-patches once ..."
From: Andreas Herrmann <andreas.herrmann3@....com>
Commit d1c84f79a6ba992dc01e312c44a21496303874d6
leads to a regression when microcode_amd.c is compiled into the kernel.
It causes a big boot delay because the firmware is not available.
See http://marc.info/?l=linux-kernel&m=126267290920060
It also renders the reload sysfs attribute useless.
Fixing this is too intrusive for an -rc5 kernel.
Thus I'd like to restore the microcode loading behaviour of kernel
2.6.32.
CC: Gene Heskett <gene.heskett@...izon.net>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
arch/x86/include/asm/microcode.h | 2 -
arch/x86/kernel/microcode_amd.c | 44 +++++++++++--------------------------
arch/x86/kernel/microcode_core.c | 6 -----
3 files changed, 13 insertions(+), 39 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index c24ca9a..ef51b50 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -12,8 +12,6 @@ struct device;
enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
struct microcode_ops {
- void (*init)(struct device *device);
- void (*fini)(void);
enum ucode_state (*request_microcode_user) (int cpu,
const void __user *buf, size_t size);
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 37542b6..e1af7c0 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -36,9 +36,6 @@ MODULE_LICENSE("GPL v2");
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE 0x00000001
-const struct firmware *firmware;
-static int supported_cpu;
-
struct equiv_cpu_entry {
u32 installed_cpu;
u32 fixed_errata_mask;
@@ -77,12 +74,15 @@ static struct equiv_cpu_entry *equiv_cpu_table;
static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
u32 dummy;
- if (!supported_cpu)
- return -1;
-
memset(csig, 0, sizeof(*csig));
+ if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
+ pr_warning("microcode: CPU%d: AMD CPU family 0x%x not "
+ "supported\n", cpu, c->x86);
+ return -1;
+ }
rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
pr_info("CPU%d: patch_level=0x%x\n", cpu, csig->rev);
return 0;
@@ -294,10 +294,14 @@ generic_load_microcode(int cpu, const u8 *data, size_t size)
static enum ucode_state request_microcode_fw(int cpu, struct device *device)
{
+ const char *fw_name = "amd-ucode/microcode_amd.bin";
+ const struct firmware *firmware;
enum ucode_state ret;
- if (firmware == NULL)
+ if (request_firmware(&firmware, fw_name, device)) {
+ printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
return UCODE_NFOUND;
+ }
if (*(u32 *)firmware->data != UCODE_MAGIC) {
pr_err("invalid UCODE_MAGIC (0x%08x)\n",
@@ -307,6 +311,8 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device)
ret = generic_load_microcode(cpu, firmware->data, firmware->size);
+ release_firmware(firmware);
+
return ret;
}
@@ -325,31 +331,7 @@ static void microcode_fini_cpu_amd(int cpu)
uci->mc = NULL;
}
-void init_microcode_amd(struct device *device)
-{
- const char *fw_name = "amd-ucode/microcode_amd.bin";
- struct cpuinfo_x86 *c = &boot_cpu_data;
-
- WARN_ON(c->x86_vendor != X86_VENDOR_AMD);
-
- if (c->x86 < 0x10) {
- pr_warning("AMD CPU family 0x%x not supported\n", c->x86);
- return;
- }
- supported_cpu = 1;
-
- if (request_firmware(&firmware, fw_name, device))
- pr_err("failed to load file %s\n", fw_name);
-}
-
-void fini_microcode_amd(void)
-{
- release_firmware(firmware);
-}
-
static struct microcode_ops microcode_amd_ops = {
- .init = init_microcode_amd,
- .fini = fini_microcode_amd,
.request_microcode_user = request_microcode_user,
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info_amd,
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 0c86324..cceb5bc 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -521,9 +521,6 @@ static int __init microcode_init(void)
return PTR_ERR(microcode_pdev);
}
- if (microcode_ops->init)
- microcode_ops->init(µcode_pdev->dev);
-
get_online_cpus();
mutex_lock(µcode_mutex);
@@ -566,9 +563,6 @@ static void __exit microcode_exit(void)
platform_device_unregister(microcode_pdev);
- if (microcode_ops->fini)
- microcode_ops->fini();
-
microcode_ops = NULL;
pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
--
1.6.6
--
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