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Message-ID: <20240213210252.901865302@linutronix.de>
Date: Tue, 13 Feb 2024 22:06:09 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org,
Tom Lendacky <thomas.lendacky@....com>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Huang Rui <ray.huang@....com>,
Juergen Gross <jgross@...e.com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Sohil Mehta <sohil.mehta@...el.com>,
K Prateek Nayak <kprateek.nayak@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
Zhang Rui <rui.zhang@...el.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Feng Tang <feng.tang@...el.com>,
Andy Shevchenko <andy@...radead.org>,
Michael Kelley <mhklinux@...look.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [patch 25/30] x86/cpu/topology: Use topology logical mapping
mechanism
From: Thomas Gleixner <tglx@...utronix.de>
Replace the logical package and die management functionality and retrieve
the logical IDs from the topology bitmaps.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/include/asm/topology.h | 15 ++--
arch/x86/kernel/cpu/common.c | 13 ---
arch/x86/kernel/cpu/topology_common.c | 4 +
arch/x86/kernel/smpboot.c | 111 ----------------------------------
4 files changed, 12 insertions(+), 131 deletions(-)
---
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -172,6 +172,13 @@ static inline int topology_get_logical_i
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
+
+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);
+}
+
extern int __max_smt_threads;
static inline int topology_max_smt_threads(void)
@@ -181,10 +188,6 @@ static inline int topology_max_smt_threa
#include <linux/cpu_smt.h>
-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);
-
extern unsigned int __amd_nodes_per_pkg;
static inline unsigned int topology_amd_nodes_per_pkg(void)
@@ -205,10 +208,6 @@ static inline bool topology_is_primary_t
}
#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
@@ -1718,18 +1718,6 @@ 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...
*/
@@ -1913,7 +1901,6 @@ 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();
if (boot_cpu_has_bug(X86_BUG_GDS))
--- 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);
+
/* Package relative core ID */
c->topo.core_id = (apicid & topo_domain_mask(TOPO_PKG_DOMAIN)) >>
x86_topo_system.dom_shifts[TOPO_SMT_DOMAIN];
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -125,23 +125,6 @@ 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;
@@ -334,103 +317,11 @@ static void notrace start_secondary(void
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
-/**
- * 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;
-}
-
static 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;
}
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