diff options
| -rw-r--r-- | drivers/of/base.c | 26 | ||||
| -rw-r--r-- | include/linux/of.h | 1 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index d4bea3c797d6..a641b1faf057 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -25,6 +25,7 @@ #include <linux/cpu.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/of_graph.h> #include <linux/spinlock.h> #include <linux/slab.h> @@ -2268,6 +2269,31 @@ struct device_node *of_find_next_cache_node(const struct device_node *np) } /** + * of_find_last_cache_level - Find the level at which the last cache is + * present for the given logical cpu + * + * @cpu: cpu number(logical index) for which the last cache level is needed + * + * Returns the the level at which the last cache is present. It is exactly + * same as the total number of cache levels for the given logical cpu. + */ +int of_find_last_cache_level(unsigned int cpu) +{ + u32 cache_level = 0; + struct device_node *prev = NULL, *np = of_cpu_device_node_get(cpu); + + while (np) { + prev = np; + of_node_put(np); + np = of_find_next_cache_node(np); + } + + of_property_read_u32(prev, "cache-level", &cache_level); + + return cache_level; +} + +/** * of_graph_parse_endpoint() - parse common endpoint node properties * @node: pointer to endpoint device_node * @endpoint: pointer to the OF endpoint data structure diff --git a/include/linux/of.h b/include/linux/of.h index d72f01009297..21e6323de0f3 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -280,6 +280,7 @@ extern struct device_node *of_get_child_by_name(const struct device_node *node, /* cache lookup */ extern struct device_node *of_find_next_cache_node(const struct device_node *); +extern int of_find_last_cache_level(unsigned int cpu); extern struct device_node *of_find_node_with_property( struct device_node *from, const char *prop_name); |