Commit a87a77cb authored Jun 29, 2020 by Srikar Dronamraju Committed by Michael Ellerman Jul 15, 2020

powerpc/cacheinfo: Add per cpu per index shared_cpu_list

Unlike drivers/base/cacheinfo, powerpc cacheinfo code is not exposing
shared_cpu_list under /sys/devices/system/cpu/cpu<n>/cache/index<m>

Add shared_cpu_list to per cpu per index directory to maintain parity
with x86. Some scripts (example: mmtests
https://github.com/gormanm/mmtests

) seem to be looking for
shared_cpu_list instead of shared_cpu_map.

Before this patch:
  # ls /sys/devices/system/cpu0/cache/index1
  coherency_line_size  number_of_sets  size  ways_of_associativity
  level                shared_cpu_map  type
  # cat /sys/devices/system/cpu0/cache/index1/shared_cpu_map
  00ff
  #

After this patch:
  # ls /sys/devices/system/cpu0/cache/index1
  coherency_line_size  number_of_sets   shared_cpu_map  type
  level                shared_cpu_list  size            ways_of_associativity
  # cat /sys/devices/system/cpu0/cache/index1/shared_cpu_map
  00ff
  # cat /sys/devices/system/cpu0/cache/index1/shared_cpu_list
  0-7
  #

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200629103703.4538-4-srikar@linux.vnet.ibm.com

parent 74b7492e

arch/powerpc/kernel/cacheinfo.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -670,12 +670,20 @@ show_shared_cpumap(struct kobject k, struct kobj_attribute attr, char *buf, bo

		static ssize_t shared_cpu_map_show(struct kobject k, struct kobj_attribute attr, char *buf)
		{
		return show_shared_cpumap(k, attr, buf, false)
		return show_shared_cpumap(k, attr, buf, false);
		}

		static ssize_t shared_cpu_list_show(struct kobject k, struct kobj_attribute attr, char *buf)
		{
		return show_shared_cpumap(k, attr, buf, true);
		}

		static struct kobj_attribute cache_shared_cpu_map_attr =
		__ATTR(shared_cpu_map, 0444, shared_cpu_map_show, NULL);

		static struct kobj_attribute cache_shared_cpu_list_attr =
		__ATTR(shared_cpu_list, 0444, shared_cpu_list_show, NULL);

		/* Attributes which should always be created -- the kobject/sysfs core
		* does this automatically via kobj_type->default_attrs. This is the
		* minimum data required to uniquely identify a cache.
		@@ -684,6 +692,7 @@ static struct attribute *cache_index_default_attrs[] = {
		&cache_type_attr.attr,
		&cache_level_attr.attr,
		&cache_shared_cpu_map_attr.attr,
		&cache_shared_cpu_list_attr.attr,
		NULL,
		};