linux-kernel - [tip:x86/topology] x86/topology: Create topology_max_die_per

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Date:   Thu, 23 May 2019 02:23:18 -0700
From:   tip-bot for Len Brown <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, peterz@...radead.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, len.brown@...el.com
Subject: [tip:x86/topology] x86/topology: Create
 topology_max_die_per_package()

Commit-ID:  14d96d6c06b5d8116b8d52c9c5530f5528ef1e61
Gitweb:     https://git.kernel.org/tip/14d96d6c06b5d8116b8d52c9c5530f5528ef1e61
Author:     Len Brown <len.brown@...el.com>
AuthorDate: Mon, 13 May 2019 13:58:46 -0400
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 23 May 2019 10:08:30 +0200

x86/topology: Create topology_max_die_per_package()

topology_max_packages() is available to size resources to cover all
packages in the system.

But now multi-die/package systems are coming up, 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>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/e6eaf384571ae52ac7d0ca41510b7fb7d2fda0e4.1557769318.git.len.brown@intel.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 ef0a44fccaec..7c17343946dd 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;
 }