linux-kernel - [RFC][PATCH 4/4] x86/cpu: Remove 'x86_cpu

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Message-Id: <20241120202414.071D4237@davehans-spike.ostc.intel.com>
Date: Wed, 20 Nov 2024 12:24:14 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org,tglx@...utronix.de,bp@...en8.de,kan.liang@...ux.intel.com,Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [RFC][PATCH 4/4] x86/cpu: Remove 'x86_cpu_desc' infrastructure


From: Dave Hansen <dave.hansen@...ux.intel.com>

All the users of 'x86_cpu_desc' are gone.  Zap it from the tree.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/arch/x86/include/asm/cpu_device_id.h |   36 ---------------------------------
 b/arch/x86/kernel/cpu/match.c          |   31 ----------------------------
 2 files changed, 67 deletions(-)

diff -puN arch/x86/include/asm/cpu_device_id.h~zap-x86_cpu_desc-3 arch/x86/include/asm/cpu_device_id.h
--- a/arch/x86/include/asm/cpu_device_id.h~zap-x86_cpu_desc-3	2024-11-20 12:22:06.484439538 -0800
+++ b/arch/x86/include/asm/cpu_device_id.h	2024-11-20 12:22:06.488439691 -0800
@@ -260,42 +260,6 @@
 		VFM_MODEL(vfm),				\
 		X86_STEPPING_ANY, feature, data)
 
-/*
- * Match specific microcode revisions.
- *
- * vendor/family/model/stepping must be all set.
- *
- * Only checks against the boot CPU.  When mixed-stepping configs are
- * valid for a CPU model, add a quirk for every valid stepping and
- * do the fine-tuning in the quirk handler.
- */
-
-struct x86_cpu_desc {
-	u8	x86_family;
-	u8	x86_vendor;
-	u8	x86_model;
-	u8	x86_stepping;
-	u32	x86_microcode_rev;
-};
-
-#define INTEL_CPU_DESC(vfm, stepping, revision) {		\
-	.x86_family		= VFM_FAMILY(vfm),		\
-	.x86_vendor		= VFM_VENDOR(vfm),		\
-	.x86_model		= VFM_MODEL(vfm),		\
-	.x86_stepping		= (stepping),			\
-	.x86_microcode_rev	= (revision),			\
-}
-
-#define AMD_CPU_DESC(fam, model, stepping, revision) {		\
-	.x86_family		= (fam),			\
-	.x86_vendor		= X86_VENDOR_AMD,		\
-	.x86_model		= (model),			\
-	.x86_stepping		= (stepping),			\
-	.x86_microcode_rev	= (revision),			\
-}
-
-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 -puN arch/x86/kernel/cpu/match.c~zap-x86_cpu_desc-3 arch/x86/kernel/cpu/match.c
--- a/arch/x86/kernel/cpu/match.c~zap-x86_cpu_desc-3	2024-11-20 12:22:06.484439538 -0800
+++ b/arch/x86/kernel/cpu/match.c	2024-11-20 12:22:06.488439691 -0800
@@ -56,37 +56,6 @@ const struct x86_cpu_id *x86_match_cpu(c
 }
 EXPORT_SYMBOL(x86_match_cpu);
 
-static const struct x86_cpu_desc *
-x86_match_cpu_with_stepping(const struct x86_cpu_desc *match)
-{
-	struct cpuinfo_x86 *c = &boot_cpu_data;
-	const struct x86_cpu_desc *m;
-
-	for (m = match; m->x86_family | m->x86_model; m++) {
-		if (c->x86_vendor != m->x86_vendor)
-			continue;
-		if (c->x86 != m->x86_family)
-			continue;
-		if (c->x86_model != m->x86_model)
-			continue;
-		if (c->x86_stepping != m->x86_stepping)
-			continue;
-		return m;
-	}
-	return NULL;
-}
-
-bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table)
-{
-	const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table);
-
-	if (!res || res->x86_microcode_rev > boot_cpu_data.microcode)
-		return false;
-
-	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);
_