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authorLen Brown <len.brown@intel.com>2019-05-13 19:58:47 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-05-23 10:08:31 +0200
commit0e344d8c709fe01d882fc0fb5452bedfe5eba67a (patch)
treeaab6ea8d855d83e6e171fb3806a88109c0bdee40 /Documentation
parentx86/topology: Create topology_max_die_per_package() (diff)
downloadlinux-0e344d8c709fe01d882fc0fb5452bedfe5eba67a.tar.xz
linux-0e344d8c709fe01d882fc0fb5452bedfe5eba67a.zip
cpu/topology: Export die_id
Export die_id in cpu topology, for the benefit of hardware that has multiple-die/package. 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> Cc: linux-doc@vger.kernel.org Link: https://lkml.kernel.org/r/e7d1caaf4fbd24ee40db6d557ab28d7d83298900.1557769318.git.len.brown@intel.com
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/cputopology.txt15
1 files changed, 12 insertions, 3 deletions
diff --git a/Documentation/cputopology.txt b/Documentation/cputopology.txt
index cb61277e2308..2ff8a1e9a2db 100644
--- a/Documentation/cputopology.txt
+++ b/Documentation/cputopology.txt
@@ -12,6 +12,12 @@ physical_package_id:
socket number, but the actual value is architecture and platform
dependent.
+die_id:
+
+ the CPU die ID of cpuX. Typically it is the hardware platform's
+ identifier (rather than the kernel's). The actual value is
+ architecture and platform dependent.
+
core_id:
the CPU core ID of cpuX. Typically it is the hardware platform's
@@ -81,6 +87,7 @@ For an architecture to support this feature, it must define some of
these macros in include/asm-XXX/topology.h::
#define topology_physical_package_id(cpu)
+ #define topology_die_id(cpu)
#define topology_core_id(cpu)
#define topology_book_id(cpu)
#define topology_drawer_id(cpu)
@@ -99,9 +106,11 @@ provides default definitions for any of the above macros that are
not defined by include/asm-XXX/topology.h:
1) topology_physical_package_id: -1
-2) topology_core_id: 0
-3) topology_sibling_cpumask: just the given CPU
-4) topology_core_cpumask: just the given CPU
+2) topology_die_id: -1
+3) topology_core_id: 0
+4) topology_sibling_cpumask: just the given CPU
+5) topology_core_cpumask: just the given CPU
+6) topology_die_cpumask: just the given CPU
For architectures that don't support books (CONFIG_SCHED_BOOK) there are no
default definitions for topology_book_id() and topology_book_cpumask().