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cacheinfo: Expose the code to generate a cache-id from a device_node 

ANBZ: #1654

cherry-picked from https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git

The MPAM driver identifies caches by id for use with resctrl. It
needs to know the cache-id when probeing, but the value isn't set
in cacheinfo until device_initcall().

Expose the code that generates the cache-id. The parts of the MPAM
driver that run early can use this to set up the resctrl structures.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Shawn Wang <shawnwang@linux.alibaba.com>
Reviewed-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
This commit is contained in:
James Morse 2021-10-20 16:04:55 +01:00 committed by Xunlei Pang
parent fdd96acd1c
commit 335a8d3f7d
2 changed files with 11 additions and 3 deletions
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13
drivers/base/cacheinfo.c
View File

@ -136,7 +136,7 @@ static bool cache_node_is_unified(struct cacheinfo *this_leaf,
return of_property_read_bool(np, "cache-unified");
}
static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
unsigned long cache_of_get_id(struct device_node *np)
{
struct device_node *cpu;
unsigned long min_id = ~0UL;
@ -155,8 +155,15 @@ static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
}
}
if (min_id != ~0UL) {
this_leaf->id = min_id;
return min_id;
}
static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
{
unsigned long id = cache_of_get_id(np);
if (id != ~0UL) {
this_leaf->id = id;
this_leaf->attributes |= CACHE_ID;
}
}

1
include/linux/cacheinfo.h
View File

@ -102,6 +102,7 @@ int acpi_find_last_cache_level(unsigned int cpu);
#endif
const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
unsigned long cache_of_get_id(struct device_node *np);
/*
* Get the id of the cache associated with @cpu at level @level.