[patch V4 37/41] x86/cpu: Remove topology.c

Thomas Gleixner
2023-08-14T08:56:41Z

No more users. Stick it into the ugly code museum.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>

---
arch/x86/kernel/cpu/Makefile | 2
arch/x86/kernel/cpu/topology.c | 164 -----------------------------------------
2 files changed, 1 insertion(+), 165 deletions(-)

--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -18,7 +18,7 @@ KMSAN_SANITIZE_common.o := n
KCSAN_SANITIZE_common.o := n

obj-y := cacheinfo.o scattered.o
-obj-y += topology_common.o topology_ext.o topology_amd.o topology.o
+obj-y += topology_common.o topology_ext.o topology_amd.o
obj-y += common.o
obj-y += rdrand.o
obj-y += match.o
--- a/arch/x86/kernel/cpu/topology.c
+++ /dev/null
@@ -1,164 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Check for extended topology enumeration cpuid leaf 0xb and if it
- * exists, use it for populating initial_apicid and cpu topology
- * detection.
- */
-
-#include <linux/cpu.h>
-#include <asm/apic.h>
-#include <asm/memtype.h>
-#include <asm/processor.h>
-
-#include "cpu.h"
-
-/* leaf 0xb SMT level */
-#define SMT_LEVEL 0
-
-/* extended topology sub-leaf types */
-#define INVALID_TYPE 0
-#define SMT_TYPE 1
-#define CORE_TYPE 2
-#define DIE_TYPE 5
-
-#define LEAFB_SUBTYPE(ecx) (((ecx) >> 8) & 0xff)
-#define BITS_SHIFT_NEXT_LEVEL(eax) ((eax) & 0x1f)
-#define LEVEL_MAX_SIBLINGS(ebx) ((ebx) & 0xffff)
-
-#ifdef CONFIG_SMP
-/*
- * Check if given CPUID extended topology "leaf" is implemented
- */
-static int check_extended_topology_leaf(int leaf)
-{
- unsigned int eax, ebx, ecx, edx;
-
- cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
-
- if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE))
- return -1;
-
- return 0;
-}
-/*
- * Return best CPUID Extended Topology Leaf supported
- */
-static int detect_extended_topology_leaf(struct cpuinfo_x86 *c)
-{
- if (c->cpuid_level >= 0x1f) {
- if (check_extended_topology_leaf(0x1f) == 0)
- return 0x1f;
- }
-
- if (c->cpuid_level >= 0xb) {
- if (check_extended_topology_leaf(0xb) == 0)
- return 0xb;
- }
-
- return -1;
-}
-#endif
-
-int detect_extended_topology_early(struct cpuinfo_x86 *c)
-{
-#ifdef CONFIG_SMP
- unsigned int eax, ebx, ecx, edx;
- int leaf;
-
- leaf = detect_extended_topology_leaf(c);
- if (leaf < 0)
- return -1;
-
- set_cpu_cap(c, X86_FEATURE_XTOPOLOGY);
-
- cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
- /*
- * initial apic id, which also represents 32-bit extended x2apic id.
- */
- c->topo.initial_apicid = edx;
- smp_num_siblings = max_t(int, smp_num_siblings, LEVEL_MAX_SIBLINGS(ebx));
-#endif
- return 0;
-}
-
-/*
- * Check for extended topology enumeration cpuid leaf, and if it
- * exists, use it for populating initial_apicid and cpu topology
- * detection.
- */
-int detect_extended_topology(struct cpuinfo_x86 *c)
-{
-#ifdef CONFIG_SMP
- unsigned int eax, ebx, ecx, edx, sub_index;
- unsigned int ht_mask_width, core_plus_mask_width, die_plus_mask_width;
- unsigned int core_select_mask, core_level_siblings;
- unsigned int die_select_mask, die_level_siblings;
- unsigned int pkg_mask_width;
- bool die_level_present = false;
- int leaf;
-
- leaf = detect_extended_topology_leaf(c);
- if (leaf < 0)
- return -1;
-
- /*
- * Populate HT related information from sub-leaf level 0.
- */
- cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
- c->topo.initial_apicid = edx;
- core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
- smp_num_siblings = max_t(int, smp_num_siblings, LEVEL_MAX_SIBLINGS(ebx));
- core_plus_mask_width = ht_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
- die_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
- pkg_mask_width = die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
-
- sub_index = 1;
- while (true) {
- cpuid_count(leaf, sub_index, &eax, &ebx, &ecx, &edx);
-
- /*
- * Check for the Core type in the implemented sub leaves.
- */
- if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) {
- core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
- core_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
- die_level_siblings = core_level_siblings;
- die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
- }
- if (LEAFB_SUBTYPE(ecx) == DIE_TYPE) {
- die_level_present = true;
- die_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
- die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
- }
-
- if (LEAFB_SUBTYPE(ecx) != INVALID_TYPE)
- pkg_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
- else
- break;
-
- sub_index++;
- }
-
- core_select_mask = (~(-1 << pkg_mask_width)) >> ht_mask_width;
- die_select_mask = (~(-1 << die_plus_mask_width)) >>
- core_plus_mask_width;
-
- c->topo.core_id = apic->phys_pkg_id(c->topo.initial_apicid,
- ht_mask_width) & core_select_mask;
-
- if (die_level_present) {
- c->topo.die_id = apic->phys_pkg_id(c->topo.initial_apicid,
- core_plus_mask_width) & die_select_mask;
- }
-
- c->topo.pkg_id = apic->phys_pkg_id(c->topo.initial_apicid, pkg_mask_width);
- /*
- * Reinit the apicid, now that we have extended initial_apicid.
- */
- c->topo.apicid = apic->phys_pkg_id(c->topo.initial_apicid, 0);
-
- c->x86_max_cores = (core_level_siblings / smp_num_siblings);
- __max_die_per_package = (die_level_siblings / core_level_siblings);
-#endif
- return 0;
-}