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Message-Id: <1347021828-23034-2-git-send-email-p.zabel@pengutronix.de>
Date: Fri, 7 Sep 2012 14:43:43 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Shawn Guo <shawn.guo@...aro.org>,
Richard Zhao <richard.zhao@...escale.com>,
Huang Shijie <shijie8@...il.com>,
Dong Aisheng <dong.aisheng@...aro.org>, kernel@...gutronix.de,
devicetree-discuss@...ts.ozlabs.org
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v4 1/6] genalloc: add a global pool list, allow to find pools by phys address
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@...gutronix.de>
Reviewed-by: Shawn Guo <shawn.guo@...aro.org>
---
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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