linux-kernel - [PATCH 06/11] x86 topology: define topology_unique_die

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Date:   Mon, 18 Feb 2019 22:40:08 -0500
From:   Len Brown <lenb@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 06/11] x86 topology: define topology_unique_die_id()

From: Len Brown <len.brown@...el.com>

The topology_unique_die_id() helper calculates a unique system-wide die-id,
for the benefit of multi-die per-package systems.

This simple system-wide unique number within known bounds is sufficient.
No need for the overhead of generating a global consecutive "logical" id.

Signed-off-by: Len Brown <len.brown@...el.com>
---
 arch/x86/include/asm/topology.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index a52a572147ba..12444a1a30f3 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -106,6 +106,9 @@ extern const struct cpumask *cpu_coregroup_mask(int cpu);
 
 #define topology_logical_package_id(cpu)	(cpu_data(cpu).logical_proc_id)
 #define topology_physical_package_id(cpu)	(cpu_data(cpu).phys_proc_id)
+#define topology_unique_die_id(cpu)	((cpu_data(cpu).logical_proc_id * \
+					 cpu_data(cpu).x86_max_dies) + \
+					 cpu_data(cpu).cpu_die_id)
 #define topology_die_id(cpu)			(cpu_data(cpu).cpu_die_id)
 #define topology_core_id(cpu)			(cpu_data(cpu).cpu_core_id)
 
-- 
2.18.0-rc0