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Date: Sun, 20 Jun 2010 23:25:08 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: <linux-kernel@...r.kernel.org>,
Jonas Aaberg <jonas.aberg@...ricsson.com>,
Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 04/19] DMAENGINE: ste_dma40: use kmem cache
From: Jonas Aaberg <jonas.aberg@...ricsson.com>
Use kmem cache instead of own cache, reducing code duplication
and bug sources.
Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/dma/ste_dma40.c | 52 ++++++++++++++++------------------------------
1 files changed, 18 insertions(+), 34 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index d72eff6..b60a6db 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -34,10 +34,6 @@
#define D40_ALLOC_PHY (1 << 30)
#define D40_ALLOC_LOG_FREE 0
-/* The number of free d40_desc to keep in memory before starting
- * to kfree() them */
-#define D40_DESC_CACHE_SIZE 50
-
/* Hardware designer of the block */
#define D40_PERIPHID2_DESIGNER 0x8
@@ -172,8 +168,6 @@ struct d40_base;
* @client: Cliented owned descriptor list.
* @active: Active descriptor.
* @queue: Queued jobs.
- * @free: List of free descripts, ready to be reused.
- * @free_len: Number of descriptors in the free list.
* @dma_cfg: The client configuration of this dma channel.
* @base: Pointer to the device instance struct.
* @src_def_cfg: Default cfg register setting for src.
@@ -197,8 +191,6 @@ struct d40_chan {
struct list_head client;
struct list_head active;
struct list_head queue;
- struct list_head free;
- int free_len;
struct stedma40_chan_cfg dma_cfg;
struct d40_base *base;
/* Default register configurations */
@@ -242,6 +234,7 @@ struct d40_chan {
* @lcpa_base: The virtual mapped address of LCPA.
* @phy_lcpa: The physical address of the LCPA.
* @lcpa_size: The size of the LCPA area.
+ * @desc_slab: cache for descriptors.
*/
struct d40_base {
spinlock_t interrupt_lock;
@@ -268,6 +261,7 @@ struct d40_base {
void *lcpa_base;
dma_addr_t phy_lcpa;
resource_size_t lcpa_size;
+ struct kmem_cache *desc_slab;
};
/**
@@ -382,36 +376,21 @@ static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
if (async_tx_test_ack(&d->txd)) {
d40_pool_lli_free(d);
d40_desc_remove(d);
- desc = d;
- goto out;
+ break;
}
- }
-
- if (list_empty(&d40c->free)) {
- /* Alloc new desc because we're out of used ones */
- desc = kzalloc(sizeof(struct d40_desc), GFP_NOWAIT);
- if (desc == NULL)
- goto out;
- INIT_LIST_HEAD(&desc->node);
} else {
- /* Reuse an old desc. */
- desc = list_first_entry(&d40c->free,
- struct d40_desc,
- node);
- list_del(&desc->node);
- d40c->free_len--;
+ d = kmem_cache_alloc(d40c->base->desc_slab, GFP_NOWAIT);
+ if (d != NULL) {
+ memset(d, 0, sizeof(struct d40_desc));
+ INIT_LIST_HEAD(&d->node);
+ }
}
-out:
- return desc;
+ return d;
}
static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
- if (d40c->free_len < D40_DESC_CACHE_SIZE) {
- list_add_tail(&d40d->node, &d40c->free);
- d40c->free_len++;
- } else
- kfree(d40d);
+ kmem_cache_free(d40c->base->desc_slab, d40d);
}
static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
@@ -2107,13 +2086,10 @@ static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
d40c->log_num = D40_PHY_CHAN;
- INIT_LIST_HEAD(&d40c->free);
INIT_LIST_HEAD(&d40c->active);
INIT_LIST_HEAD(&d40c->queue);
INIT_LIST_HEAD(&d40c->client);
- d40c->free_len = 0;
-
tasklet_init(&d40c->tasklet, dma_tasklet,
(unsigned long) d40c);
@@ -2398,6 +2374,12 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
if (!base->lcla_pool.alloc_map)
goto failure;
+ base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (base->desc_slab == NULL)
+ goto failure;
+
return base;
failure:
@@ -2612,6 +2594,8 @@ static int __init d40_probe(struct platform_device *pdev)
failure:
if (base) {
+ if (base->desc_slab)
+ kmem_cache_destroy(base->desc_slab);
if (base->virtbase)
iounmap(base->virtbase);
if (base->lcla_pool.phy)
--
1.6.3.3
--
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