From: Len Brown <len.brown@intel.com>
Date: Mon, 13 May 2019 13:58:46 -0400
Subject: x86/topology: Create topology_max_die_per_package()
Git-commit: 14d96d6c06b5d8116b8d52c9c5530f5528ef1e61
Patch-mainline: v5.3-rc1
References: jsc#SLE-5454

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@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e6eaf384571ae52ac7d0ca41510b7fb7d2fda0e4.1557769318.git.len.brown@intel.com
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 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(-)

--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -117,7 +117,6 @@ 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;
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -121,6 +121,13 @@ extern const struct cpumask *cpu_coregro
 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)
@@ -137,6 +144,9 @@ 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; }
--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -23,6 +23,9 @@
 #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
  */
@@ -143,7 +146,7 @@ int detect_extended_topology(struct cpui
 	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;
 }