mirror of https://gitee.com/openkylin/linux.git
topology/sysfs: provide drawer id and siblings attributes
The s390 cpu topology gained another hierarchy level. The top level is now called drawer and contains several books. A book used to be the top level. In order to expose the cpu topology to user space allow to create new sysfs attributes dependent on CONFIG_SCHED_DRAWER which an architecture may define and select. These additional attributes will be available: /sys/devices/system/cpu/cpuX/topology/drawer_id /sys/devices/system/cpu/cpuX/topology/drawer_siblings /sys/devices/system/cpu/cpuX/topology/drawer_siblings_list Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
Martin Schwidefsky
parent
0599eead58
commit
a62247e1f5
|
|
@ -20,48 +20,70 @@ to /proc/cpuinfo output of some architectures:
|
|||
identifier (rather than the kernel's). The actual value is
|
||||
architecture and platform dependent.
|
||||
|
||||
4) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
|
||||
4) /sys/devices/system/cpu/cpuX/topology/drawer_id:
|
||||
|
||||
the drawer ID of cpuX. Typically it is the hardware platform's
|
||||
identifier (rather than the kernel's). The actual value is
|
||||
architecture and platform dependent.
|
||||
|
||||
5) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
|
||||
|
||||
internal kernel map of cpuX's hardware threads within the same
|
||||
core as cpuX.
|
||||
|
||||
5) /sys/devices/system/cpu/cpuX/topology/thread_siblings_list:
|
||||
6) /sys/devices/system/cpu/cpuX/topology/thread_siblings_list:
|
||||
|
||||
human-readable list of cpuX's hardware threads within the same
|
||||
core as cpuX.
|
||||
|
||||
6) /sys/devices/system/cpu/cpuX/topology/core_siblings:
|
||||
7) /sys/devices/system/cpu/cpuX/topology/core_siblings:
|
||||
|
||||
internal kernel map of cpuX's hardware threads within the same
|
||||
physical_package_id.
|
||||
|
||||
7) /sys/devices/system/cpu/cpuX/topology/core_siblings_list:
|
||||
8) /sys/devices/system/cpu/cpuX/topology/core_siblings_list:
|
||||
|
||||
human-readable list of cpuX's hardware threads within the same
|
||||
physical_package_id.
|
||||
|
||||
8) /sys/devices/system/cpu/cpuX/topology/book_siblings:
|
||||
9) /sys/devices/system/cpu/cpuX/topology/book_siblings:
|
||||
|
||||
internal kernel map of cpuX's hardware threads within the same
|
||||
book_id.
|
||||
|
||||
9) /sys/devices/system/cpu/cpuX/topology/book_siblings_list:
|
||||
10) /sys/devices/system/cpu/cpuX/topology/book_siblings_list:
|
||||
|
||||
human-readable list of cpuX's hardware threads within the same
|
||||
book_id.
|
||||
|
||||
11) /sys/devices/system/cpu/cpuX/topology/drawer_siblings:
|
||||
|
||||
internal kernel map of cpuX's hardware threads within the same
|
||||
drawer_id.
|
||||
|
||||
12) /sys/devices/system/cpu/cpuX/topology/drawer_siblings_list:
|
||||
|
||||
human-readable list of cpuX's hardware threads within the same
|
||||
drawer_id.
|
||||
|
||||
To implement it in an architecture-neutral way, a new source file,
|
||||
drivers/base/topology.c, is to export the 6 or 9 attributes. The three book
|
||||
related sysfs files will only be created if CONFIG_SCHED_BOOK is selected.
|
||||
drivers/base/topology.c, is to export the 6 to 12 attributes. The book
|
||||
and drawer related sysfs files will only be created if CONFIG_SCHED_BOOK
|
||||
and CONFIG_SCHED_DRAWER are selected.
|
||||
|
||||
CONFIG_SCHED_BOOK and CONFIG_DRAWER are currently only used on s390, where
|
||||
they reflect the cpu and cache hierarchy.
|
||||
|
||||
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_core_id(cpu)
|
||||
#define topology_book_id(cpu)
|
||||
#define topology_drawer_id(cpu)
|
||||
#define topology_sibling_cpumask(cpu)
|
||||
#define topology_core_cpumask(cpu)
|
||||
#define topology_book_cpumask(cpu)
|
||||
#define topology_drawer_cpumask(cpu)
|
||||
|
||||
The type of **_id macros is int.
|
||||
The type of **_cpumask macros is (const) struct cpumask *. The latter
|
||||
|
|
@ -78,6 +100,8 @@ not defined by include/asm-XXX/topology.h:
|
|||
|
||||
For architectures that don't support books (CONFIG_SCHED_BOOK) there are no
|
||||
default definitions for topology_book_id() and topology_book_cpumask().
|
||||
For architectures that don't support drawes (CONFIG_SCHED_DRAWER) there are
|
||||
no default definitions for topology_drawer_id() and topology_drawer_cpumask().
|
||||
|
||||
Additionally, CPU topology information is provided under
|
||||
/sys/devices/system/cpu and includes these files. The internal
|
||||
|
|
|
|||
|
|
@ -77,6 +77,14 @@ static DEVICE_ATTR_RO(book_siblings);
|
|||
static DEVICE_ATTR_RO(book_siblings_list);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_SCHED_DRAWER
|
||||
define_id_show_func(drawer_id);
|
||||
static DEVICE_ATTR_RO(drawer_id);
|
||||
define_siblings_show_func(drawer_siblings, drawer_cpumask);
|
||||
static DEVICE_ATTR_RO(drawer_siblings);
|
||||
static DEVICE_ATTR_RO(drawer_siblings_list);
|
||||
#endif
|
||||
|
||||
static struct attribute *default_attrs[] = {
|
||||
&dev_attr_physical_package_id.attr,
|
||||
&dev_attr_core_id.attr,
|
||||
|
|
@ -88,6 +96,11 @@ static struct attribute *default_attrs[] = {
|
|||
&dev_attr_book_id.attr,
|
||||
&dev_attr_book_siblings.attr,
|
||||
&dev_attr_book_siblings_list.attr,
|
||||
#endif
|
||||
#ifdef CONFIG_SCHED_DRAWER
|
||||
&dev_attr_drawer_id.attr,
|
||||
&dev_attr_drawer_siblings.attr,
|
||||
&dev_attr_drawer_siblings_list.attr,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue