Messages in this thread Patch in this message | | | From | Philipp Zabel <> | Subject | [PATCH v3 1/4] genalloc: add a global pool list, allow to find pools by phys address | Date | Mon, 3 Sep 2012 18:02:05 +0200 |
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This patch keeps all created pools in a global list and adds two functions that allow to retrieve the gen_pool pointer from a known physical address and from a device tree node.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> --- Changes since v2: - Moved struct device_node declaration out of #ifdef CONFIG_OF. - Simplified of_get_named_gen_pool using of_parse_phandle and of_address_to_resource. --- include/linux/genalloc.h | 14 ++++++++++ lib/genalloc.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index 5e98eeb..d498c43 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -33,6 +33,7 @@ * General purpose special memory pool descriptor. */ struct gen_pool { + struct list_head next_pool; /* pool in global list */ spinlock_t lock; struct list_head chunks; /* list of chunks in this pool */ int min_alloc_order; /* minimum allocation order */ @@ -78,4 +79,17 @@ extern void gen_pool_for_each_chunk(struct gen_pool *, void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *); extern size_t gen_pool_avail(struct gen_pool *); extern size_t gen_pool_size(struct gen_pool *); +extern struct gen_pool *gen_pool_find_by_phys(phys_addr_t phys); + +struct device_node; +#ifdef CONFIG_OF +extern struct gen_pool *of_get_named_gen_pool(struct device_node *np, + const char *propname, int index); +#else +inline struct gen_pool *of_get_named_gen_pool(struct device_node *np, + const char *propname, int index) +{ + return NULL; +} +#endif #endif /* __GENALLOC_H__ */ diff --git a/lib/genalloc.c b/lib/genalloc.c index 6bc04aa..90699ac 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -34,6 +34,11 @@ #include <linux/rculist.h> #include <linux/interrupt.h> #include <linux/genalloc.h> +#include <linux/of_address.h> +#include <linux/of_device.h> + +static LIST_HEAD(pools); +static DEFINE_SPINLOCK(list_lock); static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set) { @@ -152,6 +157,9 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid) spin_lock_init(&pool->lock); INIT_LIST_HEAD(&pool->chunks); pool->min_alloc_order = min_alloc_order; + spin_lock(&list_lock); + list_add_rcu(&pool->next_pool, &pools); + spin_unlock(&list_lock); } return pool; } @@ -234,6 +242,9 @@ void gen_pool_destroy(struct gen_pool *pool) int order = pool->min_alloc_order; int bit, end_bit; + spin_lock(&list_lock); + list_del_rcu(&pool->next_pool); + spin_unlock(&list_lock); list_for_each_safe(_chunk, _next_chunk, &pool->chunks) { chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); list_del(&chunk->next_chunk); @@ -400,3 +411,59 @@ size_t gen_pool_size(struct gen_pool *pool) return size; } EXPORT_SYMBOL_GPL(gen_pool_size); + +/** + * gen_pool_find_by_phys - find a pool by physical start address + * @phys: physical address as added with gen_pool_add_virt + * + * Returns the pool that contains the chunk starting at phys, + * or NULL if not found. + */ +struct gen_pool *gen_pool_find_by_phys(phys_addr_t phys) +{ + struct gen_pool *pool, *found = NULL; + struct gen_pool_chunk *chunk; + + rcu_read_lock(); + list_for_each_entry_rcu(pool, &pools, next_pool) { + list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { + if (phys == chunk->phys_addr) { + found = pool; + break; + } + } + } + rcu_read_unlock(); + + return found; +} +EXPORT_SYMBOL_GPL(gen_pool_find_by_phys); + +#ifdef CONFIG_OF +/** + * of_get_named_gen_pool - find a pool by phandle property + * @np: device node + * @propname: property name containing phandle(s) + * @index: index into the phandle array + * + * Returns the pool that contains the chunk starting at the physical + * address of the device tree node pointed at by the phandle property, + * or NULL if not found. + */ +struct gen_pool *of_get_named_gen_pool(struct device_node *np, + const char *propname, int index) +{ + struct device_node *np_pool; + struct resource res; + int ret; + + np_pool = of_parse_phandle(np, propname, index); + if (!np_pool) + return NULL; + ret = of_address_to_resource(np_pool, 0, &res); + if (ret < 0) + return NULL; + return gen_pool_find_by_phys((phys_addr_t) res.start); +} +EXPORT_SYMBOL_GPL(of_get_named_gen_pool); +#endif /* CONFIG_OF */ -- 1.7.10.4
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