0f42b790c9
For bug workarounds or checks, it is useful to check for specific microcode revisions. Add a new generic function to match the CPU with stepping. Add the other function to check the min microcode revisions for the matched CPU. A new table format is introduced to facilitate the quirk to fill the related information. This does not change the existing x86_cpu_id because it's an ABI shared with modules, and also has quite different requirements, as in no wildcards, but everything has to be matched exactly. Originally-by: Andi Kleen <ak@linux.intel.com> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: eranian@google.com Link: https://lkml.kernel.org/r/1549319013-4522-1-git-send-email-kan.liang@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
42 lines
1,015 B
C
42 lines
1,015 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _CPU_DEVICE_ID
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#define _CPU_DEVICE_ID 1
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/*
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* Declare drivers belonging to specific x86 CPUs
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* Similar in spirit to pci_device_id and related PCI functions
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*/
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#include <linux/mod_devicetable.h>
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extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
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/*
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* Match specific microcode revisions.
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*
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* vendor/family/model/stepping must be all set.
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*
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* Only checks against the boot CPU. When mixed-stepping configs are
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* valid for a CPU model, add a quirk for every valid stepping and
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* do the fine-tuning in the quirk handler.
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*/
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struct x86_cpu_desc {
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__u8 x86_family;
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__u8 x86_vendor;
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__u8 x86_model;
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__u8 x86_stepping;
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__u32 x86_microcode_rev;
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};
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#define INTEL_CPU_DESC(mod, step, rev) { \
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.x86_family = 6, \
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.x86_vendor = X86_VENDOR_INTEL, \
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.x86_model = mod, \
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.x86_stepping = step, \
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.x86_microcode_rev = rev, \
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}
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extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
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#endif
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