soc/amd/cezanne,picasso,sabrina: factor out get_threads_per_core

This code is common to at least all Zen-based APUs (Picasso, Cezanne,
Sabrina) and is also useful outside of the SoC-specific dynamic ACPI
table generation code.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ie96d4429fb6ed9223efed9b3c754e04052d7ca7c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61357
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rob Barnes <robbarnes@google.com>
Reviewed-by: Chris Wang <chris.wang@amd.corp-partner.google.com>
Reviewed-by: Eric Peers <epeers@google.com>

src/soc/amd/cezanne/acpi.c

@@ -320,9 +320,7 @@ void generate_cpu_entries(const struct device *device)
 		},
 	};
 
-	threads_per_core = ((cpuid_ebx(CPUID_EBX_CORE_ID) & CPUID_EBX_THREADS_MASK)
-			    >> CPUID_EBX_THREADS_SHIFT)
-			   + 1;
+	threads_per_core = get_threads_per_core();
 	pstate_count = get_pstate_info(pstate_values, pstate_xpss_values);
 	logical_cores = get_cpu_count();
 

src/soc/amd/common/block/cpu/noncar/cpu.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <amdblocks/cpu.h>
+#include <cpu/amd/cpuid.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/amd/msr.h>
@@ -11,6 +12,12 @@ int get_cpu_count(void)
 	return 1 + (cpuid_ecx(0x80000008) & 0xff);
 }
 
+unsigned int get_threads_per_core(void)
+{
+	return 1 + ((cpuid_ebx(CPUID_EBX_CORE_ID) & CPUID_EBX_THREADS_MASK)
+		    >> CPUID_EBX_THREADS_SHIFT);
+}
+
 void set_cstate_io_addr(void)
 {
 	msr_t cst_addr;

src/soc/amd/common/block/include/amdblocks/cpu.h

@@ -5,6 +5,7 @@
 
 void early_cache_setup(void);
 int get_cpu_count(void);
+unsigned int get_threads_per_core(void);
 void set_cstate_io_addr(void);
 void write_resume_eip(void);
 

src/soc/amd/picasso/acpi.c

@@ -316,9 +316,7 @@ void generate_cpu_entries(const struct device *device)
 		},
 	};
 
-	threads_per_core = ((cpuid_ebx(CPUID_EBX_CORE_ID) & CPUID_EBX_THREADS_MASK)
-			    >> CPUID_EBX_THREADS_SHIFT)
-			   + 1;
+	threads_per_core = get_threads_per_core();
 	pstate_count = get_pstate_info(pstate_values, pstate_xpss_values);
 	logical_cores = get_cpu_count();
 

src/soc/amd/sabrina/acpi.c

@@ -322,9 +322,7 @@ void generate_cpu_entries(const struct device *device)
 		},
 	};
 
-	threads_per_core = ((cpuid_ebx(CPUID_EBX_CORE_ID) & CPUID_EBX_THREADS_MASK)
-			    >> CPUID_EBX_THREADS_SHIFT)
-			   + 1;
+	threads_per_core = get_threads_per_core();
 	pstate_count = get_pstate_info(pstate_values, pstate_xpss_values);
 	logical_cores = get_cpu_count();