linux-kernel - [patch V4 11/30] x86/microcode/intel: Rework intel_cpu_collect

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Date:   Mon,  2 Oct 2023 13:59:47 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Borislav Petkov <bp@...en8.de>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Nikolay Borisov <nik.borisov@...e.com>
Subject: [patch V4 11/30] x86/microcode/intel: Rework intel_cpu_collect_info()

Nothing needs struct ucode_cpu_info. Make it take struct cpu_signature, let
it return a boolean and simplify the implementation. Rename it now that the
silly name clash with collect_cpu_info() is gone.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V2: New patch
---
 arch/x86/include/asm/cpu.h            |    4 ++--
 arch/x86/kernel/cpu/microcode/intel.c |   33 +++++++++------------------------
 drivers/platform/x86/intel/ifs/load.c |    8 +++-----
 3 files changed, 14 insertions(+), 31 deletions(-)

--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -73,9 +73,9 @@ static inline void init_ia32_feat_ctl(st
 
 extern __noendbr void cet_disable(void);
 
-struct ucode_cpu_info;
+struct cpu_signature;
 
-int intel_cpu_collect_info(struct ucode_cpu_info *uci);
+void intel_collect_cpu_info(struct cpu_signature *sig);
 
 static inline bool intel_cpu_signatures_match(unsigned int s1, unsigned int p1,
 					      unsigned int s2, unsigned int p2)
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -66,36 +66,21 @@ static inline unsigned int exttable_size
 	return et->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE;
 }
 
-int intel_cpu_collect_info(struct ucode_cpu_info *uci)
+void intel_collect_cpu_info(struct cpu_signature *sig)
 {
-	unsigned int val[2];
-	unsigned int family, model;
-	struct cpu_signature csig = { 0 };
-	unsigned int eax, ebx, ecx, edx;
+	sig->sig = cpuid_eax(1);
+	sig->pf = 0;
+	sig->rev = intel_get_microcode_revision();
 
-	memset(uci, 0, sizeof(*uci));
+	if (x86_model(sig->sig) >= 5 || x86_family(sig->sig) > 6) {
+		unsigned int val[2];
 
-	eax = 0x00000001;
-	ecx = 0;
-	native_cpuid(&eax, &ebx, &ecx, &edx);
-	csig.sig = eax;
-
-	family = x86_family(eax);
-	model  = x86_model(eax);
-
-	if (model >= 5 || family > 6) {
 		/* get processor flags from MSR 0x17 */
 		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
-		csig.pf = 1 << ((val[1] >> 18) & 7);
+		sig->pf = 1 << ((val[1] >> 18) & 7);
 	}
-
-	csig.rev = intel_get_microcode_revision();
-
-	uci->cpu_sig = csig;
-
-	return 0;
 }
-EXPORT_SYMBOL_GPL(intel_cpu_collect_info);
+EXPORT_SYMBOL_GPL(intel_collect_cpu_info);
 
 /*
  * Returns 1 if update has been found, 0 otherwise.
@@ -377,7 +362,7 @@ static __init struct microcode_intel *ge
 	if (!(cp.data && cp.size))
 		return NULL;
 
-	intel_cpu_collect_info(uci);
+	intel_collect_cpu_info(&uci->cpu_sig);
 
 	return scan_microcode(cp.data, cp.size, uci);
 }
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -227,7 +227,7 @@ static int scan_chunks_sanity_check(stru
 
 static int image_sanity_check(struct device *dev, const struct microcode_header_intel *data)
 {
-	struct ucode_cpu_info uci;
+	struct cpu_signature sig;
 
 	/* Provide a specific error message when loading an older/unsupported image */
 	if (data->hdrver != MC_HEADER_TYPE_IFS) {
@@ -240,11 +240,9 @@ static int image_sanity_check(struct dev
 		return -EINVAL;
 	}
 
-	intel_cpu_collect_info(&uci);
+	intel_collect_cpu_info(&sig);
 
-	if (!intel_find_matching_signature((void *)data,
-					   uci.cpu_sig.sig,
-					   uci.cpu_sig.pf)) {
+	if (!intel_find_matching_signature((void *)data, sig.sig, sig.pf)) {
 		dev_err(dev, "cpu signature, processor flags not matching\n");
 		return -EINVAL;
 	}