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rapidio/tsi721_dma: fix pending transaction queue handling

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Fix pending DMA request queue handling to avoid broken ordering during
concurrent request submissions.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2016-03-22 14:25:57 -07:00 committed by Linus Torvalds
parent 9673b883c2
commit d2a321f37e
2 changed files with 33 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/rapidio/devices/tsi721.h
View File

@ -674,7 +674,7 @@ struct tsi721_bdma_chan {
struct dma_chan dchan;
struct tsi721_tx_desc *tx_desc;
spinlock_t lock;
struct list_head active_list;
struct tsi721_tx_desc *active_tx;
struct list_head queue;
struct list_head free_list;
struct tasklet_struct tasklet;

62
drivers/rapidio/devices/tsi721_dma.c
View File

@ -63,14 +63,6 @@ struct tsi721_tx_desc *to_tsi721_desc(struct dma_async_tx_descriptor *txd)
return container_of(txd, struct tsi721_tx_desc, txd);
}
static inline
struct tsi721_tx_desc *tsi721_dma_first_active(
struct tsi721_bdma_chan *bdma_chan)
{
return list_first_entry(&bdma_chan->active_list,
struct tsi721_tx_desc, desc_node);
}
static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan, int bd_num)
{
struct tsi721_dma_desc *bd_ptr;
@ -534,23 +526,30 @@ entry_done:
return err;
}
static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan)
static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan,
struct tsi721_tx_desc *desc)
{
struct tsi721_tx_desc *desc;
int err;
dev_dbg(bdma_chan->dchan.device->dev, "%s: Enter\n", __func__);
/*
* If there are any new transactions in the queue add them
* into the processing list
*/
if (!list_empty(&bdma_chan->queue))
list_splice_init(&bdma_chan->queue, &bdma_chan->active_list);
if (!tsi721_dma_is_idle(bdma_chan))
return;
/* Start new transaction (if available) */
if (!list_empty(&bdma_chan->active_list)) {
desc = tsi721_dma_first_active(bdma_chan);
/*
* If there is no data transfer in progress, fetch new descriptor from
* the pending queue.
*/
if (desc == NULL && bdma_chan->active_tx == NULL &&
!list_empty(&bdma_chan->queue)) {
desc = list_first_entry(&bdma_chan->queue,
struct tsi721_tx_desc, desc_node);
list_del_init((&desc->desc_node));
bdma_chan->active_tx = desc;
}
if (desc) {
err = tsi721_submit_sg(desc);
if (!err)
tsi721_start_dma(bdma_chan);
@ -581,6 +580,10 @@ static void tsi721_dma_tasklet(unsigned long data)
dev_err(bdma_chan->dchan.device->dev,
"%s: DMA ERROR - DMAC%d_STS = 0x%x\n",
__func__, bdma_chan->id, dmac_sts);
spin_lock(&bdma_chan->lock);
bdma_chan->active_tx = NULL;
spin_unlock(&bdma_chan->lock);
}
if (dmac_int & TSI721_DMAC_INT_STFULL) {
@ -594,7 +597,7 @@ static void tsi721_dma_tasklet(unsigned long data)
tsi721_clr_stat(bdma_chan);
spin_lock(&bdma_chan->lock);
desc = tsi721_dma_first_active(bdma_chan);
desc = bdma_chan->active_tx;
if (desc->sg_len == 0) {
dma_async_tx_callback callback = NULL;
@ -606,14 +609,15 @@ static void tsi721_dma_tasklet(unsigned long data)
callback = desc->txd.callback;
param = desc->txd.callback_param;
}
list_move(&desc->desc_node, &bdma_chan->free_list);
list_add(&desc->desc_node, &bdma_chan->free_list);
bdma_chan->active_tx = NULL;
spin_unlock(&bdma_chan->lock);
if (callback)
callback(param);
spin_lock(&bdma_chan->lock);
}
tsi721_advance_work(bdma_chan);
tsi721_advance_work(bdma_chan, bdma_chan->active_tx);
spin_unlock(&bdma_chan->lock);
}
@ -720,9 +724,6 @@ static void tsi721_free_chan_resources(struct dma_chan *dchan)
if (bdma_chan->bd_base == NULL)
return;
BUG_ON(!list_empty(&bdma_chan->active_list));
BUG_ON(!list_empty(&bdma_chan->queue));
tsi721_bdma_interrupt_enable(bdma_chan, 0);
bdma_chan->active = false;
tsi721_sync_dma_irq(bdma_chan);
@ -745,11 +746,11 @@ static void tsi721_issue_pending(struct dma_chan *dchan)
dev_dbg(dchan->device->dev, "%s: Enter\n", __func__);
if (tsi721_dma_is_idle(bdma_chan) && bdma_chan->active) {
spin_lock_bh(&bdma_chan->lock);
tsi721_advance_work(bdma_chan);
spin_unlock_bh(&bdma_chan->lock);
if (tsi721_dma_is_idle(bdma_chan) && bdma_chan->active) {
tsi721_advance_work(bdma_chan, NULL);
}
spin_unlock_bh(&bdma_chan->lock);
}
static
@ -839,7 +840,8 @@ static int tsi721_terminate_all(struct dma_chan *dchan)
} while ((dmac_int & TSI721_DMAC_INT_SUSP) == 0);
}
list_splice_init(&bdma_chan->active_list, &list);
if (bdma_chan->active_tx)
list_add(&bdma_chan->active_tx->desc_node, &list);
list_splice_init(&bdma_chan->queue, &list);
list_for_each_entry_safe(desc, _d, &list, desc_node)
@ -875,7 +877,7 @@ int tsi721_register_dma(struct tsi721_device *priv)
spin_lock_init(&bdma_chan->lock);
INIT_LIST_HEAD(&bdma_chan->active_list);
bdma_chan->active_tx = NULL;
INIT_LIST_HEAD(&bdma_chan->queue);
INIT_LIST_HEAD(&bdma_chan->free_list);