x86/cpu: Introduce new microcode matching helper

The 'x86_cpu_id' and 'x86_cpu_desc' structures are very similar and
need to be consolidated.  There is a microcode version matching
function for 'x86_cpu_desc' but not 'x86_cpu_id'.

Create one for 'x86_cpu_id'.

This essentially just leverages the x86_cpu_id->driver_data field
to replace the less generic x86_cpu_desc->x86_microcode_rev field.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20241213185128.8F24EEFC%40davehans-spike.ostc.intel.com

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index e4121d9aa9e114e3d08906b1f5eb5f9f067c0843..9c77dbee96a7f4293fee94aa3019ca0be226bbf2 100644 (file)
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -278,5 +278,6 @@ struct x86_cpu_desc {
 
 extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
 extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
+extern bool x86_match_min_microcode_rev(const struct x86_cpu_id *table);
 
 #endif /* _ASM_X86_CPU_DEVICE_ID */

diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
index 8e7de733320ae7db681e41bb61503325b18df614..2de2a83a7e128cd3bfb35c50b8552dc84a6a5420 100644 (file)
--- a/arch/x86/kernel/cpu/match.c
+++ b/arch/x86/kernel/cpu/match.c
@@ -86,3 +86,14 @@ bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table)
        return true;
 }
 EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev);
+
+bool x86_match_min_microcode_rev(const struct x86_cpu_id *table)
+{
+       const struct x86_cpu_id *res = x86_match_cpu(table);
+
+       if (!res || res->driver_data > boot_cpu_data.microcode)
+               return false;
+
+       return true;
+}
+EXPORT_SYMBOL_GPL(x86_match_min_microcode_rev);