linux-kernel - [PATCH 3/3] tools/x86/kcpuid: Dump the CPUID function in detailed view

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Date:   Mon, 6 Feb 2023 08:18:32 -0600
From:   Terry Bowman <terry.bowman@....com>
To:     <terry.bowman@....com>, <linux-kernel@...r.kernel.org>,
        <bp@...e.de>, <feng.tang@...el.com>, <x86@...nel.org>
Subject: [PATCH 3/3] tools/x86/kcpuid: Dump the CPUID function in detailed view

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Sometimes it is useful to know which CPUID leaf contains the fields so
add it to -d output so that it looks like this:

  CPUID_0x8000001e_ECX[0x0]:
           extended_apic_id       : 0x8           - Extended APIC ID
           core_id                : 0x4           - Identifies the logical core ID
           threads_per_core       : 0x1           - The number of threads per core is threads_per_core + 1
           node_id                : 0x0           - Node ID
           nodes_per_processor    : 0x0           - Nodes per processor { 0: 1 node, else reserved }

  CPUID_0x8000001f_ECX[0x0]:
           sme                 -  Secure Memory Encryption

...

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 tools/arch/x86/kcpuid/kcpuid.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/arch/x86/kcpuid/kcpuid.c b/tools/arch/x86/kcpuid/kcpuid.c
index dae75511fef7..3bab3398cec3 100644
--- a/tools/arch/x86/kcpuid/kcpuid.c
+++ b/tools/arch/x86/kcpuid/kcpuid.c
@@ -468,13 +468,21 @@ static void show_leaf(struct subleaf *leaf)
 	if (!leaf)
 		return;
 
-	if (show_raw)
+	if (show_raw) {
 		leaf_print_raw(leaf);
+	} else {
+		if (show_details)
+			printf("CPUID_0x%x_ECX[0x%x]:\n",
+				leaf->index, leaf->sub);
+	}
 
 	decode_bits(leaf->eax, &leaf->info[R_EAX]);
 	decode_bits(leaf->ebx, &leaf->info[R_EBX]);
 	decode_bits(leaf->ecx, &leaf->info[R_ECX]);
 	decode_bits(leaf->edx, &leaf->info[R_EDX]);
+
+	if (!show_raw && show_details)
+		printf("\n");
 }
 
 static void show_func(struct cpuid_func *func)
-- 
2.34.1