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Message-Id: <f29322ff37990b684cf93effff0c9d14c356d607.1557177585.git.len.brown@intel.com>
Date: Mon, 6 May 2019 17:26:00 -0400
From: Len Brown <lenb@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 05/22] x86 topology: Create topology_max_die_per_package()
From: Len Brown <len.brown@...el.com>
topology_max_packages() is available to size resources to
cover all packages in the system.
But now we have multi-die/package systems, and some
resources are per-die.
Create topology_max_die_per_package(), for detecting
multi-die/package systems, and sizing any per-die resources.
Signed-off-by: Len Brown <len.brown@...el.com>
---
arch/x86/include/asm/processor.h | 1 -
arch/x86/include/asm/topology.h | 10 ++++++++++
arch/x86/kernel/cpu/topology.c | 5 ++++-
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 2507edc30cc2..5f45488b1a9d 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -106,7 +106,6 @@ struct cpuinfo_x86 {
unsigned long loops_per_jiffy;
/* cpuid returned max cores value: */
u16 x86_max_cores;
- u16 x86_max_dies;
u16 apicid;
u16 initial_apicid;
u16 x86_clflush_size;
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 453cf38a1c33..e0232f7042c3 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -115,6 +115,13 @@ extern const struct cpumask *cpu_coregroup_mask(int cpu);
extern unsigned int __max_logical_packages;
#define topology_max_packages() (__max_logical_packages)
+extern unsigned int __max_die_per_package;
+
+static inline int topology_max_die_per_package(void)
+{
+ return __max_die_per_package;
+}
+
extern int __max_smt_threads;
static inline int topology_max_smt_threads(void)
@@ -131,6 +138,9 @@ bool topology_smt_supported(void);
static inline int
topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
+static inline int topology_phys_to_logical_die(unsigned int die,
+ unsigned int cpu) { return 0; }
+static inline int topology_max_die_per_package(void) { return 1; }
static inline int topology_max_smt_threads(void) { return 1; }
static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
static inline bool topology_smt_supported(void) { return false; }
diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c
index 4d17e699657d..ee48c3fc8a65 100644
--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -26,6 +26,9 @@
#define LEVEL_MAX_SIBLINGS(ebx) ((ebx) & 0xffff)
#ifdef CONFIG_SMP
+unsigned int __max_die_per_package __read_mostly = 1;
+EXPORT_SYMBOL(__max_die_per_package);
+
/*
* Check if given CPUID extended toplogy "leaf" is implemented
*/
@@ -146,7 +149,7 @@ int detect_extended_topology(struct cpuinfo_x86 *c)
c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
c->x86_max_cores = (core_level_siblings / smp_num_siblings);
- c->x86_max_dies = (die_level_siblings / core_level_siblings);
+ __max_die_per_package = (die_level_siblings / core_level_siblings);
#endif
return 0;
}
--
2.18.0-rc0
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