From: lauraa@codeaurora.org (Laura Abbott)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv4 2/5] lib/genalloc.c: Add genpool range check function
Date: Tue, 22 Jul 2014 18:35:05 -0700 [thread overview]
Message-ID: <1406079308-5232-3-git-send-email-lauraa@codeaurora.org> (raw)
In-Reply-To: <1406079308-5232-1-git-send-email-lauraa@codeaurora.org>
After allocating an address from a particular genpool,
there is no good way to verify if that address actually
belongs to a genpool. Introduce addr_in_gen_pool which
will return if an address plus size falls completely
within the genpool range.
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
---
include/linux/genalloc.h | 3 +++
lib/genalloc.c | 29 +++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 3cd0934..1ccaab4 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -121,6 +121,9 @@ extern struct gen_pool *devm_gen_pool_create(struct device *dev,
int min_alloc_order, int nid);
extern struct gen_pool *dev_get_gen_pool(struct device *dev);
+bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
+ size_t size);
+
#ifdef CONFIG_OF
extern struct gen_pool *of_get_named_gen_pool(struct device_node *np,
const char *propname, int index);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 9758529..66edf93 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -403,6 +403,35 @@ void gen_pool_for_each_chunk(struct gen_pool *pool,
EXPORT_SYMBOL(gen_pool_for_each_chunk);
/**
+ * addr_in_gen_pool - checks if an address falls within the range of a pool
+ * @pool: the generic memory pool
+ * @start: start address
+ * @size: size of the region
+ *
+ * Check if the range of addresses falls within the specified pool. Takes
+ * the rcu_read_lock for the duration of the check.
+ */
+bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
+ size_t size)
+{
+ bool found = false;
+ unsigned long end = start + size;
+ struct gen_pool_chunk *chunk;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) {
+ if (start >= chunk->start_addr && start <= chunk->end_addr) {
+ if (end <= chunk->end_addr) {
+ found = true;
+ break;
+ }
+ }
+ }
+ rcu_read_unlock();
+ return found;
+}
+
+/**
* gen_pool_avail - get available free space of the pool
* @pool: pool to get available free space
*
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-07-23 1:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 1:35 [PATCHv4 0/5] Atomic pool for arm64 Laura Abbott
2014-07-23 1:35 ` [PATCHv4 1/5] lib/genalloc.c: Add power aligned algorithm Laura Abbott
2014-07-23 1:35 ` Laura Abbott [this message]
2014-07-23 1:35 ` [PATCHv4 3/5] common: dma-mapping: Introduce common remapping functions Laura Abbott
2014-07-23 10:45 ` Catalin Marinas
2014-07-23 21:56 ` Laura Abbott
2014-07-24 13:52 ` Catalin Marinas
2014-07-23 11:16 ` Catalin Marinas
2014-07-23 1:35 ` [PATCHv4 4/5] arm: use genalloc for the atomic pool Laura Abbott
2014-07-23 1:35 ` [PATCHv4 5/5] arm64: Add atomic pool for non-coherent and CMA allocations Laura Abbott
2014-07-24 13:56 ` [PATCHv4 0/5] Atomic pool for arm64 Catalin Marinas
-- strict thread matches above, loose matches on Subject: below --
2014-07-02 18:03 [PATCHv4 0/5] DMA " Laura Abbott
2014-07-02 18:03 ` [PATCHv4 2/5] lib/genalloc.c: Add genpool range check function Laura Abbott
2014-07-03 18:14 ` Will Deacon
2014-07-09 22:33 ` Olof Johansson
2014-07-21 19:51 ` Laura Abbott
2014-07-22 15:50 ` Catalin Marinas
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