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authorZhang, Yanmin <yanmin.zhang@intel.com>2006-02-03 03:04:36 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-03 08:32:09 -0800
commit69dcc99199fe29b0a29471a3488d39d9d33b25fc (patch)
tree4232ad9a782dee6abfe7fa20c95a49249195de8f /include/asm-i386
parent66ac5a294db70aa377c0d7bbdb0c4e3ef2349b7b (diff)
[PATCH] Export cpu topology in sysfs
The patch implements cpu topology exportation by sysfs. Items (attributes) are similar to /proc/cpuinfo. 1) /sys/devices/system/cpu/cpuX/topology/physical_package_id: represent the physical package id of cpu X; 2) /sys/devices/system/cpu/cpuX/topology/core_id: represent the cpu core id to cpu X; 3) /sys/devices/system/cpu/cpuX/topology/thread_siblings: represent the thread siblings to cpu X in the same core; 4) /sys/devices/system/cpu/cpuX/topology/core_siblings: represent the thread siblings to cpu X in the same physical package; To implement it in an architecture-neutral way, a new source file, driver/base/topology.c, is to export the 5 attributes. If one architecture wants to support this feature, it just needs to implement 4 defines, typically in file include/asm-XXX/topology.h. The 4 defines are: #define topology_physical_package_id(cpu) #define topology_core_id(cpu) #define topology_thread_siblings(cpu) #define topology_core_siblings(cpu) The type of **_id is int. The type of siblings is cpumask_t. To be consistent on all architectures, the 4 attributes should have deafult values if their values are unavailable. Below is the rule. 1) physical_package_id: If cpu has no physical package id, -1 is the default value. 2) core_id: If cpu doesn't support multi-core, its core id is 0. 3) thread_siblings: Just include itself, if the cpu doesn't support HT/multi-thread. 4) core_siblings: Just include itself, if the cpu doesn't support multi-core and HT/Multi-thread. So be careful when declaring the 4 defines in include/asm-XXX/topology.h. If an attribute isn't defined on an architecture, it won't be exported. Thank Nathan, Greg, Andi, Paul and Venki. The patch provides defines for i386/x86_64/ia64. Signed-off-by: Zhang, Yanmin <yanmin.zhang@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/topology.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-i386/topology.h b/include/asm-i386/topology.h
index d7e19eb344b..af503a122b2 100644
--- a/include/asm-i386/topology.h
+++ b/include/asm-i386/topology.h
@@ -27,6 +27,15 @@
#ifndef _ASM_I386_TOPOLOGY_H
#define _ASM_I386_TOPOLOGY_H
+#ifdef CONFIG_SMP
+#define topology_physical_package_id(cpu) \
+ (phys_proc_id[cpu] == BAD_APICID ? -1 : phys_proc_id[cpu])
+#define topology_core_id(cpu) \
+ (cpu_core_id[cpu] == BAD_APICID ? 0 : cpu_core_id[cpu])
+#define topology_core_siblings(cpu) (cpu_core_map[cpu])
+#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
+#endif
+
#ifdef CONFIG_NUMA
#include <asm/mpspec.h>