dmaengine: PL08x: split the pend_list in two
Our behaviour wasn't correct; issue_pending is supposed to be called before any submitted descriptors are available for processing by the DMA engine. Split the pend_list in two, one for submitted descriptors and another list for issued descriptors. Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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1 changed files with 28 additions and 13 deletions
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@ -217,6 +217,7 @@ enum pl08x_dma_chan_state {
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* @cd: channel platform data
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* @cd: channel platform data
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* @runtime_addr: address for RX/TX according to the runtime config
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* @runtime_addr: address for RX/TX according to the runtime config
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* @pend_list: queued transactions pending on this channel
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* @pend_list: queued transactions pending on this channel
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* @issued_list: issued transactions for this channel
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* @done_list: list of completed transactions
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* @done_list: list of completed transactions
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* @at: active transaction on this channel
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* @at: active transaction on this channel
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* @lock: a lock for this channel data
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* @lock: a lock for this channel data
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@ -235,6 +236,7 @@ struct pl08x_dma_chan {
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const struct pl08x_channel_data *cd;
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const struct pl08x_channel_data *cd;
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struct dma_slave_config cfg;
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struct dma_slave_config cfg;
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struct list_head pend_list;
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struct list_head pend_list;
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struct list_head issued_list;
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struct list_head done_list;
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struct list_head done_list;
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struct pl08x_txd *at;
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struct pl08x_txd *at;
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spinlock_t lock;
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spinlock_t lock;
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@ -362,7 +364,7 @@ static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan)
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struct pl08x_txd *txd;
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struct pl08x_txd *txd;
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u32 val;
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u32 val;
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txd = list_first_entry(&plchan->pend_list, struct pl08x_txd, node);
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txd = list_first_entry(&plchan->issued_list, struct pl08x_txd, node);
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list_del(&txd->node);
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list_del(&txd->node);
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plchan->at = txd;
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plchan->at = txd;
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@ -525,6 +527,15 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
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}
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}
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/* Sum up all queued transactions */
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/* Sum up all queued transactions */
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if (!list_empty(&plchan->issued_list)) {
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struct pl08x_txd *txdi;
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list_for_each_entry(txdi, &plchan->issued_list, node) {
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struct pl08x_sg *dsg;
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list_for_each_entry(dsg, &txd->dsg_list, node)
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bytes += dsg->len;
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}
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}
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if (!list_empty(&plchan->pend_list)) {
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if (!list_empty(&plchan->pend_list)) {
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struct pl08x_txd *txdi;
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struct pl08x_txd *txdi;
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list_for_each_entry(txdi, &plchan->pend_list, node) {
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list_for_each_entry(txdi, &plchan->pend_list, node) {
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@ -991,16 +1002,17 @@ static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
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static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
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static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
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struct pl08x_dma_chan *plchan)
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struct pl08x_dma_chan *plchan)
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{
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{
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struct pl08x_txd *txdi = NULL;
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LIST_HEAD(head);
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struct pl08x_txd *next;
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struct pl08x_txd *txd;
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if (!list_empty(&plchan->pend_list)) {
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list_splice_tail_init(&plchan->issued_list, &head);
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list_for_each_entry_safe(txdi,
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list_splice_tail_init(&plchan->pend_list, &head);
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next, &plchan->pend_list, node) {
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while (!list_empty(&head)) {
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txd = list_first_entry(&head, struct pl08x_txd, node);
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pl08x_release_mux(plchan);
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pl08x_release_mux(plchan);
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list_del(&txdi->node);
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list_del(&txd->node);
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pl08x_free_txd(pl08x, txdi);
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pl08x_free_txd(pl08x, txd);
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}
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}
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}
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}
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}
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@ -1269,6 +1281,8 @@ static void pl08x_issue_pending(struct dma_chan *chan)
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unsigned long flags;
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unsigned long flags;
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spin_lock_irqsave(&plchan->lock, flags);
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spin_lock_irqsave(&plchan->lock, flags);
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list_splice_tail_init(&plchan->pend_list, &plchan->issued_list);
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/* Something is already active, or we're waiting for a channel... */
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/* Something is already active, or we're waiting for a channel... */
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if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
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if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
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spin_unlock_irqrestore(&plchan->lock, flags);
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spin_unlock_irqrestore(&plchan->lock, flags);
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@ -1276,7 +1290,7 @@ static void pl08x_issue_pending(struct dma_chan *chan)
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}
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}
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/* Take the first element in the queue and execute it */
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/* Take the first element in the queue and execute it */
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if (!list_empty(&plchan->pend_list)) {
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if (!list_empty(&plchan->issued_list)) {
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plchan->state = PL08X_CHAN_RUNNING;
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plchan->state = PL08X_CHAN_RUNNING;
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pl08x_start_next_txd(plchan);
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pl08x_start_next_txd(plchan);
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}
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}
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@ -1658,9 +1672,9 @@ static void pl08x_tasklet(unsigned long data)
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list_splice_tail_init(&plchan->done_list, &head);
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list_splice_tail_init(&plchan->done_list, &head);
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/* If a new descriptor is queued, set it up plchan->at is NULL here */
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/* If a new descriptor is queued, set it up plchan->at is NULL here */
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if (!list_empty(&plchan->pend_list)) {
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if (!list_empty(&plchan->issued_list)) {
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pl08x_start_next_txd(plchan);
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pl08x_start_next_txd(plchan);
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} else if (plchan->phychan_hold) {
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} else if (!list_empty(&plchan->pend_list) || plchan->phychan_hold) {
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/*
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/*
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* This channel is still in use - we have a new txd being
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* This channel is still in use - we have a new txd being
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* prepared and will soon be queued. Don't give up the
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* prepared and will soon be queued. Don't give up the
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@ -1841,6 +1855,7 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
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spin_lock_init(&chan->lock);
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spin_lock_init(&chan->lock);
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INIT_LIST_HEAD(&chan->pend_list);
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INIT_LIST_HEAD(&chan->pend_list);
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INIT_LIST_HEAD(&chan->issued_list);
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INIT_LIST_HEAD(&chan->done_list);
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INIT_LIST_HEAD(&chan->done_list);
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tasklet_init(&chan->tasklet, pl08x_tasklet,
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tasklet_init(&chan->tasklet, pl08x_tasklet,
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(unsigned long) chan);
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(unsigned long) chan);
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