diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0066-x86-cpu-AMD-Fix-erratum-1076-CPB-bit.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0066-x86-cpu-AMD-Fix-erratum-1076-CPB-bit.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0066-x86-cpu-AMD-Fix-erratum-1076-CPB-bit.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0066-x86-cpu-AMD-Fix-erratum-1076-CPB-bit.patch new file mode 100644 index 00000000..b9d9a567 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0066-x86-cpu-AMD-Fix-erratum-1076-CPB-bit.patch @@ -0,0 +1,55 @@ +From b6aa89b4ab638e59beab4c2d264c02dfc887187f Mon Sep 17 00:00:00 2001 +From: Borislav Petkov <bp@suse.de> +Date: Thu, 7 Sep 2017 19:08:21 +0200 +Subject: [PATCH 66/93] x86/cpu/AMD: Fix erratum 1076 (CPB bit) + +commit f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 upstream + +CPUID Fn8000_0007_EDX[CPB] is wrongly 0 on models up to B1. But they do +support CPB (AMD's Core Performance Boosting cpufreq CPU feature), so fix that. + +Signed-off-by: Borislav Petkov <bp@suse.de> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Sherry Hurwitz <sherry.hurwitz@amd.com> +Cc: Thomas Gleixner <tglx@linutronix.de> +Link: http://lkml.kernel.org/r/20170907170821.16021-1-bp@alien8.de +Signed-off-by: Ingo Molnar <mingo@kernel.org> +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/kernel/cpu/amd.c | 11 +++++++++++ + 1 file changed, 11 insertions(+) + +diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c +index 179d572..21367b5 100644 +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -749,6 +749,16 @@ static void init_amd_bd(struct cpuinfo_x86 *c) + } + } + ++static void init_amd_zn(struct cpuinfo_x86 *c) ++{ ++ /* ++ * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects ++ * all up to and including B1. ++ */ ++ if (c->x86_model <= 1 && c->x86_stepping <= 1) ++ set_cpu_cap(c, X86_FEATURE_CPB); ++} ++ + static void init_amd(struct cpuinfo_x86 *c) + { + u32 dummy; +@@ -779,6 +789,7 @@ static void init_amd(struct cpuinfo_x86 *c) + case 0x10: init_amd_gh(c); break; + case 0x12: init_amd_ln(c); break; + case 0x15: init_amd_bd(c); break; ++ case 0x17: init_amd_zn(c); break; + } + + /* Enable workaround for FXSAVE leak */ +-- +2.7.4 + |