[patch 47/53] x86/cpu/topology: Use topology logical mapping mechanism

Thomas Gleixner
2023-08-07T13:56:34Z

Replace the logical package and die management functionality and retrieve
the logical IDs from the topology bitmaps.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/topology.h | 13 +--
arch/x86/kernel/cpu/common.c | 13 ---
arch/x86/kernel/cpu/topology_common.c | 4 +
arch/x86/kernel/smpboot.c | 111 ----------------------------------
4 files changed, 11 insertions(+), 130 deletions(-)

--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -158,6 +158,12 @@ static inline unsigned int topology_max_

int topology_get_logical_id(u32 apicid, enum x86_topology_domains at_level);

+static inline int topology_phys_to_logical_pkg(unsigned int pkg)
+{
+ return topology_get_logical_id(pkg << x86_topo_system.dom_shifts[TOPO_PKG_DOMAIN],
+ TOPO_PKG_DOMAIN);
+}
+
#ifdef CONFIG_SMP
#define topology_cluster_id(cpu) (cpu_data(cpu).topo.l2c_id)
#define topology_die_cpumask(cpu) (per_cpu(cpu_die_map, cpu))
@@ -172,9 +178,6 @@ static inline int topology_max_smt_threa
return __max_smt_threads;
}

-int topology_update_package_map(unsigned int apicid, unsigned int cpu);
-int topology_update_die_map(unsigned int dieid, unsigned int cpu);
-int topology_phys_to_logical_pkg(unsigned int pkg);
bool topology_smt_supported(void);

extern unsigned int __amd_nodes_per_pkg;
@@ -199,10 +202,6 @@ static inline bool topology_is_primary_t
void topology_apply_cmdline_limits_early(void);

#else /* CONFIG_SMP */
-static inline int
-topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
-static inline int
-topology_update_die_map(unsigned int dieid, unsigned int cpu) { return 0; }
static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
static inline int topology_max_smt_threads(void) { return 1; }
static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1679,18 +1679,6 @@ static void generic_identify(struct cpui
#endif
}

-static void update_package_map(struct cpuinfo_x86 *c)
-{
-#ifdef CONFIG_SMP
- unsigned int cpu = smp_processor_id();
-
- BUG_ON(topology_update_package_map(c->topo.pkg_id, cpu));
- BUG_ON(topology_update_die_map(c->topo.die_id, cpu));
-#else
- c->topo.logical_pkg_id = 0;
-#endif
-}
-
/*
* This does the hard work of actually picking apart the CPU stuff...
*/
@@ -1868,7 +1856,6 @@ void identify_secondary_cpu(struct cpuin
#ifdef CONFIG_X86_32
enable_sep_cpu();
#endif
- update_package_map(c);
x86_spec_ctrl_setup_ap();
update_srbds_msr();

--- a/arch/x86/kernel/cpu/topology_common.c
+++ b/arch/x86/kernel/cpu/topology_common.c
@@ -10,6 +10,7 @@
#include "cpu.h"

struct x86_topology_system x86_topo_system __ro_after_init;
+EXPORT_SYMBOL_GPL(x86_topo_system);

unsigned int __amd_nodes_per_pkg __ro_after_init;
EXPORT_SYMBOL_GPL(__amd_nodes_per_pkg);
@@ -147,6 +148,9 @@ static void topo_set_ids(struct topo_sca
c->topo.pkg_id = topo_shift_apicid(apicid, TOPO_PKG_DOMAIN);
c->topo.die_id = topo_shift_apicid(apicid, TOPO_DIE_DOMAIN);

+ c->topo.logical_pkg_id = topology_get_logical_id(apicid, TOPO_PKG_DOMAIN);
+ c->topo.logical_die_id = topology_get_logical_id(apicid, TOPO_DIE_DOMAIN);
+
/* Relative core ID */
c->topo.core_id = topo_relative_domain_id(apicid, TOPO_CORE_DOMAIN);

--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -124,23 +124,6 @@ struct mwait_cpu_dead {
*/
static DEFINE_PER_CPU_ALIGNED(struct mwait_cpu_dead, mwait_cpu_dead);

-/* Logical package management. */
-struct logical_maps {
- u32 phys_pkg_id;
- u32 phys_die_id;
- u32 logical_pkg_id;
- u32 logical_die_id;
-};
-
-/* Temporary workaround until the full topology mechanics is in place */
-static DEFINE_PER_CPU_READ_MOSTLY(struct logical_maps, logical_maps) = {
- .phys_pkg_id = U32_MAX,
- .phys_die_id = U32_MAX,
-};
-
-static unsigned int logical_packages __read_mostly;
-static unsigned int logical_die __read_mostly;
-
/* Maximum number of SMT threads on any online core */
int __read_mostly __max_smt_threads = 1;

@@ -345,103 +328,11 @@ bool topology_smt_supported(void)
return smp_num_siblings > 1;
}

-/**
- * topology_phys_to_logical_pkg - Map a physical package id to a logical
- * @phys_pkg: The physical package id to map
- *
- * Returns logical package id or -1 if not found
- */
-int topology_phys_to_logical_pkg(unsigned int phys_pkg)
-{
- int cpu;
-
- for_each_possible_cpu(cpu) {
- if (per_cpu(logical_maps.phys_pkg_id, cpu) == phys_pkg)
- return per_cpu(logical_maps.logical_pkg_id, cpu);
- }
- return -1;
-}
-EXPORT_SYMBOL(topology_phys_to_logical_pkg);
-
-/**
- * topology_phys_to_logical_die - Map a physical die id to logical
- * @die_id: The physical die id to map
- * @cur_cpu: The CPU for which the mapping is done
- *
- * Returns logical die id or -1 if not found
- */
-static int topology_phys_to_logical_die(unsigned int die_id, unsigned int cur_cpu)
-{
- int cpu, proc_id = cpu_data(cur_cpu).topo.pkg_id;
-
- for_each_possible_cpu(cpu) {
- if (per_cpu(logical_maps.phys_pkg_id, cpu) == proc_id &&
- per_cpu(logical_maps.phys_die_id, cpu) == die_id)
- return per_cpu(logical_maps.logical_die_id, cpu);
- }
- return -1;
-}
-
-/**
- * topology_update_package_map - Update the physical to logical package map
- * @pkg: The physical package id as retrieved via CPUID
- * @cpu: The cpu for which this is updated
- */
-int topology_update_package_map(unsigned int pkg, unsigned int cpu)
-{
- int new;
-
- /* Already available somewhere? */
- new = topology_phys_to_logical_pkg(pkg);
- if (new >= 0)
- goto found;
-
- new = logical_packages++;
- if (new != pkg) {
- pr_info("CPU %u Converting physical %u to logical package %u\n",
- cpu, pkg, new);
- }
-found:
- per_cpu(logical_maps.phys_pkg_id, cpu) = pkg;
- per_cpu(logical_maps.logical_pkg_id, cpu) = new;
- cpu_data(cpu).topo.logical_pkg_id = new;
- return 0;
-}
-/**
- * topology_update_die_map - Update the physical to logical die map
- * @die: The die id as retrieved via CPUID
- * @cpu: The cpu for which this is updated
- */
-int topology_update_die_map(unsigned int die, unsigned int cpu)
-{
- int new;
-
- /* Already available somewhere? */
- new = topology_phys_to_logical_die(die, cpu);
- if (new >= 0)
- goto found;
-
- new = logical_die++;
- if (new != die) {
- pr_info("CPU %u Converting physical %u to logical die %u\n",
- cpu, die, new);
- }
-found:
- per_cpu(logical_maps.phys_die_id, cpu) = die;
- per_cpu(logical_maps.logical_die_id, cpu) = new;
- cpu_data(cpu).topo.logical_die_id = new;
- return 0;
-}
-
void __init smp_store_boot_cpu_info(void)
{
- int id = 0; /* CPU 0 */
- struct cpuinfo_x86 *c = &cpu_data(id);
+ struct cpuinfo_x86 *c = &cpu_data(0);

*c = boot_cpu_data;
- c->cpu_index = id;
- topology_update_package_map(c->topo.pkg_id, id);
- topology_update_die_map(c->topo.die_id, id);
c->initialized = true;
}