From: laurentiu.tudor@nxp.com
To: hch@lst.de, stern@rowland.harvard.edu,
gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
marex@denx.de
Cc: leoyang.li@nxp.com, linux-kernel@vger.kernel.org,
robin.murphy@arm.com, noring@nocrew.org, JuergenUrban@gmx.de
Subject: [PATCH v7 1/5] lib/genalloc.c: Add gen_pool_dma_zalloc() for zeroed DMA allocations
Date: Wed, 29 May 2019 13:28:39 +0300 [thread overview]
Message-ID: <20190529102843.13174-2-laurentiu.tudor@nxp.com> (raw)
In-Reply-To: <20190529102843.13174-1-laurentiu.tudor@nxp.com>
From: Fredrik Noring <noring@nocrew.org>
gen_pool_dma_zalloc() is a zeroed memory variant of gen_pool_dma_alloc().
Document return values of both, and indicate NULL as a "%NULL" constant.
Signed-off-by: Fredrik Noring <noring@nocrew.org>
Tested-by: Fredrik Noring <noring@nocrew.org>
---
include/linux/genalloc.h | 1 +
lib/genalloc.c | 29 ++++++++++++++++++++++++++++-
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index dd0a452373e7..6c62eeca754f 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -121,6 +121,7 @@ extern unsigned long gen_pool_alloc_algo(struct gen_pool *, size_t,
genpool_algo_t algo, void *data);
extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size,
dma_addr_t *dma);
+void *gen_pool_dma_zalloc(struct gen_pool *pool, size_t size, dma_addr_t *dma);
extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
extern void gen_pool_for_each_chunk(struct gen_pool *,
void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 7e85d1e37a6e..5db43476a19b 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -337,12 +337,14 @@ EXPORT_SYMBOL(gen_pool_alloc_algo);
* gen_pool_dma_alloc - allocate special memory from the pool for DMA usage
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
- * @dma: dma-view physical address return value. Use NULL if unneeded.
+ * @dma: dma-view physical address return value. Use %NULL if unneeded.
*
* Allocate the requested number of bytes from the specified pool.
* Uses the pool allocation function (with first-fit algorithm by default).
* Can not be used in NMI handler on architectures without
* NMI-safe cmpxchg implementation.
+ *
+ * Return: virtual address of the allocated memory, or %NULL on failure
*/
void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
{
@@ -362,6 +364,31 @@ void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
}
EXPORT_SYMBOL(gen_pool_dma_alloc);
+/**
+ * gen_pool_dma_zalloc - allocate special zeroed memory from the pool for
+ * DMA usage
+ * @pool: pool to allocate from
+ * @size: number of bytes to allocate from the pool
+ * @dma: dma-view physical address return value. Use %NULL if unneeded.
+ *
+ * Allocate the requested number of zeroed bytes from the specified pool.
+ * Uses the pool allocation function (with first-fit algorithm by default).
+ * Can not be used in NMI handler on architectures without
+ * NMI-safe cmpxchg implementation.
+ *
+ * Return: virtual address of the allocated zeroed memory, or %NULL on failure
+ */
+void *gen_pool_dma_zalloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
+{
+ void *vaddr = gen_pool_dma_alloc(pool, size, dma);
+
+ if (vaddr)
+ memset(vaddr, 0, size);
+
+ return vaddr;
+}
+EXPORT_SYMBOL(gen_pool_dma_zalloc);
+
/**
* gen_pool_free - free allocated special memory back to the pool
* @pool: pool to free to
--
2.17.1
next prev parent reply other threads:[~2019-05-29 10:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 10:28 [PATCH v7 0/5] prerequisites for device reserved local mem rework laurentiu.tudor
2019-05-29 10:28 ` laurentiu.tudor [this message]
2019-05-29 10:28 ` [PATCH v7 2/5] USB: use genalloc for USB HCs with local memory laurentiu.tudor
2019-05-29 10:38 ` Greg KH
2019-05-29 11:15 ` Laurentiu Tudor
2019-05-29 11:23 ` Greg KH
2019-05-29 11:25 ` hch
2019-05-29 11:32 ` Greg KH
2019-05-29 10:28 ` [PATCH v7 3/5] usb: host: ohci-sm501: init genalloc for " laurentiu.tudor
2019-06-05 21:46 ` Guenter Roeck
2019-06-11 13:32 ` Guenter Roeck
2019-06-11 17:26 ` Fredrik Noring
2019-06-11 19:03 ` Guenter Roeck
2019-06-13 13:40 ` Fredrik Noring
2019-06-13 13:54 ` Guenter Roeck
2019-06-13 15:34 ` Fredrik Noring
2019-06-13 18:05 ` Guenter Roeck
2019-06-14 14:28 ` Fredrik Noring
2019-06-24 6:35 ` Christoph Hellwig
2019-06-24 12:59 ` Fredrik Noring
2019-06-25 6:00 ` Christoph Hellwig
2019-06-25 15:05 ` [PATCH 1/2] lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators Fredrik Noring
2019-06-25 15:08 ` [PATCH 2/2] usb: host: Fix excessive alignment restriction for local memory allocations Fredrik Noring
2019-06-25 20:54 ` Guenter Roeck
2019-06-25 20:54 ` [PATCH 1/2] lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators Guenter Roeck
2019-06-28 5:57 ` Christoph Hellwig
2019-06-18 10:48 ` [PATCH v7 3/5] usb: host: ohci-sm501: init genalloc for local memory Laurentiu Tudor
2019-05-29 10:28 ` [PATCH v7 4/5] usb: host: ohci-tmio: " laurentiu.tudor
2019-05-29 10:28 ` [PATCH v7 5/5] USB: drop HCD_LOCAL_MEM flag laurentiu.tudor
2019-05-29 11:34 ` [PATCH v7 0/5] prerequisites for device reserved local mem rework Greg KH
2019-05-29 11:37 ` Christoph Hellwig
2019-05-29 14:06 ` Laurentiu Tudor
2019-05-31 16:43 ` Christoph Hellwig
2019-05-31 17:06 ` Laurentiu Tudor
2019-06-04 14:16 ` Laurentiu Tudor
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