From 8cc2361bd00e87aab2827a3996a71fe9b2c9f9c4 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Tue, 17 Nov 2009 08:06:38 +0100 Subject: [PATCH] x86: ucode-amd: Move family check to microcde_amd.c's init function ... to avoid useless trial to load firmware on systems with unsupported AMD CPUs. Signed-off-by: Andreas Herrmann Cc: Dmitry Adamushko Cc: Mike Travis Cc: Tigran Aivazian Cc: Borislav Petkov Cc: Andreas Mohr Cc: Jack Steiner LKML-Reference: <20091117070638.GA27691@alberich.amd.com> [ v2: changed BUG_ON() to WARN_ON() ] Signed-off-by: Ingo Molnar --- arch/x86/kernel/microcode_amd.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 26e33bd8485..63123d90210 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -34,6 +34,7 @@ MODULE_LICENSE("GPL v2"); #define UCODE_UCODE_TYPE 0x00000001 const struct firmware *firmware; +static int supported_cpu; struct equiv_cpu_entry { u32 installed_cpu; @@ -73,15 +74,12 @@ 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; - 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); + if (!supported_cpu) return -1; - } + + memset(csig, 0, sizeof(*csig)); rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy); pr_info("microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev); return 0; @@ -331,6 +329,17 @@ static void microcode_fini_cpu_amd(int cpu) 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("microcode: AMD CPU family 0x%x not supported\n", + c->x86); + return; + } + supported_cpu = 1; + if (request_firmware(&firmware, fw_name, device)) pr_err("microcode: failed to load file %s\n", fw_name); } -- 2.20.1