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Date: Tue, 2 Mar 2010 21:12:36 +0100
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>,
linux-kernel@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 3/5] DMAENGINE: COH 901 318 remove irq counting
This removes the pointless irq counting for the COH 901 318, as
it turns out the hardware will only ever fire one IRQ for a linked
list anyway. In the process also a missing spinlock was introduced.
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/dma/coh901318.c | 76 +++++++++++++++++-------------------------
drivers/dma/coh901318_lli.c | 13 ++------
2 files changed, 34 insertions(+), 55 deletions(-)
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index 00398ca..544c462 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -39,7 +39,6 @@ struct coh901318_desc {
unsigned int sg_len;
struct coh901318_lli *data;
enum dma_data_direction dir;
- int pending_irqs;
unsigned long flags;
};
@@ -72,7 +71,6 @@ struct coh901318_chan {
unsigned long nbr_active_done;
unsigned long busy;
- int pending_irqs;
struct coh901318_base *base;
};
@@ -368,10 +366,6 @@ static void
coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
{
list_add_tail(&desc->node, &cohc->active);
-
- BUG_ON(cohc->pending_irqs != 0);
-
- cohc->pending_irqs = desc->pending_irqs;
}
static struct coh901318_desc *
@@ -617,38 +611,31 @@ static void dma_tasklet(unsigned long data)
/* get first active descriptor entry from list */
cohd_fin = coh901318_first_active_get(cohc);
- BUG_ON(cohd_fin->pending_irqs == 0);
-
if (cohd_fin == NULL)
goto err;
- cohd_fin->pending_irqs--;
- cohc->completed = cohd_fin->desc.cookie;
+ /* locate callback to client */
+ callback = cohd_fin->desc.callback;
+ callback_param = cohd_fin->desc.callback_param;
- if (cohc->nbr_active_done == 0)
- return;
+ /* sign this job as completed on the channel */
+ cohc->completed = cohd_fin->desc.cookie;
- if (!cohd_fin->pending_irqs) {
- /* release the lli allocation*/
- coh901318_lli_free(&cohc->base->pool, &cohd_fin->data);
- }
+ /* release the lli allocation and remove the descriptor */
+ coh901318_lli_free(&cohc->base->pool, &cohd_fin->data);
- dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d pending_irqs %d"
- " nbr_active_done %ld\n", __func__,
- cohc->id, cohc->pending_irqs, cohc->nbr_active_done);
+ /* return desc to free-list */
+ coh901318_desc_remove(cohd_fin);
+ coh901318_desc_free(cohc, cohd_fin);
- /* callback to client */
- callback = cohd_fin->desc.callback;
- callback_param = cohd_fin->desc.callback_param;
+ spin_unlock_irqrestore(&cohc->lock, flags);
- if (!cohd_fin->pending_irqs) {
- coh901318_desc_remove(cohd_fin);
+ /* Call the callback when we're done */
+ if (callback)
+ callback(callback_param);
- /* return desc to free-list */
- coh901318_desc_free(cohc, cohd_fin);
- }
+ spin_lock_irqsave(&cohc->lock, flags);
- if (cohc->nbr_active_done)
/*
* If another interrupt fired while the tasklet was scheduling,
* we don't get called twice, so we have this number of active
@@ -656,8 +643,7 @@ static void dma_tasklet(unsigned long data)
* be handled for this channel. If there happen to be more than
* one IRQ to be ack:ed, we simply schedule this tasklet again.
*/
- cohc->nbr_active_done--;
-
+ cohc->nbr_active_done--;
if (cohc->nbr_active_done) {
dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs "
"came in while we were scheduling this tasklet\n");
@@ -666,10 +652,8 @@ static void dma_tasklet(unsigned long data)
else
tasklet_schedule(&cohc->tasklet);
}
- spin_unlock_irqrestore(&cohc->lock, flags);
- if (callback)
- callback(callback_param);
+ spin_unlock_irqrestore(&cohc->lock, flags);
return;
@@ -688,16 +672,17 @@ static void dma_tc_handle(struct coh901318_chan *cohc)
if (!cohc->allocated)
return;
- BUG_ON(cohc->pending_irqs == 0);
+ spin_lock(&cohc->lock);
- cohc->pending_irqs--;
cohc->nbr_active_done++;
- if (cohc->pending_irqs == 0 && coh901318_queue_start(cohc) == NULL)
+ if (coh901318_queue_start(cohc) == NULL)
cohc->busy = 0;
BUG_ON(list_empty(&cohc->active));
+ spin_unlock(&cohc->lock);
+
if (cohc_chan_conf(cohc)->priority_high)
tasklet_hi_schedule(&cohc->tasklet);
else
@@ -951,6 +936,7 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;
u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
unsigned long flg;
+ int ret;
if (!sgl)
goto out;
@@ -1010,13 +996,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
goto err_dma_alloc;
/* initiate allocated data list */
- cohd->pending_irqs =
- coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len,
- cohc_dev_addr(cohc),
- ctrl_chained,
- ctrl,
- ctrl_last,
- direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
+ ret = coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len,
+ cohc_dev_addr(cohc),
+ ctrl_chained,
+ ctrl,
+ ctrl_last,
+ direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
+ if (ret)
+ goto err_lli_fill;
COH_DBG(coh901318_list_print(cohc, data));
@@ -1030,6 +1017,7 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
spin_unlock_irqrestore(&cohc->lock, flg);
return &cohd->desc;
+ err_lli_fill:
err_dma_alloc:
err_direction:
spin_unlock_irqrestore(&cohc->lock, flg);
@@ -1121,7 +1109,6 @@ coh901318_terminate_all(struct dma_chan *chan)
cohc->nbr_active_done = 0;
cohc->busy = 0;
- cohc->pending_irqs = 0;
spin_unlock_irqrestore(&cohc->lock, flags);
}
@@ -1148,7 +1135,6 @@ void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
spin_lock_init(&cohc->lock);
- cohc->pending_irqs = 0;
cohc->nbr_active_done = 0;
cohc->busy = 0;
INIT_LIST_HEAD(&cohc->free);
diff --git a/drivers/dma/coh901318_lli.c b/drivers/dma/coh901318_lli.c
index f5120f2..5f9af19 100644
--- a/drivers/dma/coh901318_lli.c
+++ b/drivers/dma/coh901318_lli.c
@@ -166,8 +166,7 @@ coh901318_lli_fill_memcpy(struct coh901318_pool *pool,
lli->src_addr = src;
lli->dst_addr = dst;
- /* One irq per single transfer */
- return 1;
+ return 0;
}
int
@@ -223,8 +222,7 @@ coh901318_lli_fill_single(struct coh901318_pool *pool,
lli->src_addr = src;
lli->dst_addr = dst;
- /* One irq per single transfer */
- return 1;
+ return 0;
}
int
@@ -240,7 +238,6 @@ coh901318_lli_fill_sg(struct coh901318_pool *pool,
u32 ctrl_sg;
dma_addr_t src = 0;
dma_addr_t dst = 0;
- int nbr_of_irq = 0;
u32 bytes_to_transfer;
u32 elem_size;
@@ -269,9 +266,6 @@ coh901318_lli_fill_sg(struct coh901318_pool *pool,
ctrl_sg = ctrl ? ctrl : ctrl_last;
- if ((ctrl_sg & ctrl_irq_mask))
- nbr_of_irq++;
-
if (dir == DMA_TO_DEVICE)
/* increment source address */
src = sg_dma_address(sg);
@@ -310,8 +304,7 @@ coh901318_lli_fill_sg(struct coh901318_pool *pool,
}
spin_unlock(&pool->lock);
- /* There can be many IRQs per sg transfer */
- return nbr_of_irq;
+ return 0;
err:
spin_unlock(&pool->lock);
return -EINVAL;
--
1.6.3.3
--
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