[RFC 30/34] dmaengine: PL08x: convert to use vchan done list
Russell King
rmk+kernel at arm.linux.org.uk
Tue May 29 05:45:21 EDT 2012
Convert to use the virtual dma channel done list, tasklet, and
descriptor freeing.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
---
drivers/dma/amba-pl08x.c | 135 ++++++++++++++++++---------------------------
1 files changed, 54 insertions(+), 81 deletions(-)
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index eb556c5..2b9fe0e 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -160,16 +160,16 @@ struct pl08x_sg {
/**
* struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
* @vd: virtual DMA descriptor
- * @node: node for txd list for channels
* @dsg_list: list of children sg's
* @llis_bus: DMA memory address (physical) start for the LLIs
* @llis_va: virtual memory address start for the LLIs
* @cctl: control reg values for current txd
* @ccfg: config reg values for current txd
+ * @done: this marks completed descriptors, which should not have their
+ * mux released.
*/
struct pl08x_txd {
struct virt_dma_desc vd;
- struct list_head node;
struct list_head dsg_list;
dma_addr_t llis_bus;
struct pl08x_lli *llis_va;
@@ -180,6 +180,7 @@ struct pl08x_txd {
* trigger this txd. Other registers are in llis_va[0].
*/
u32 ccfg;
+ bool done;
};
/**
@@ -204,11 +205,9 @@ enum pl08x_dma_chan_state {
* struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
* @vc: wrappped virtual channel
* @phychan: the physical channel utilized by this channel, if there is one
- * @tasklet: tasklet scheduled by the IRQ to handle actual work etc
* @name: name of channel
* @cd: channel platform data
* @runtime_addr: address for RX/TX according to the runtime config
- * @done_list: list of completed transactions
* @at: active transaction on this channel
* @lock: a lock for this channel data
* @host: a pointer to the host (internal use)
@@ -220,11 +219,9 @@ enum pl08x_dma_chan_state {
struct pl08x_dma_chan {
struct virt_dma_chan vc;
struct pl08x_phy_chan *phychan;
- struct tasklet_struct tasklet;
const char *name;
const struct pl08x_channel_data *cd;
struct dma_slave_config cfg;
- struct list_head done_list;
struct pl08x_txd *at;
struct pl08x_driver_data *host;
enum pl08x_dma_chan_state state;
@@ -1077,6 +1074,52 @@ static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
kfree(txd);
}
+static void pl08x_unmap_buffers(struct pl08x_txd *txd)
+{
+ struct device *dev = txd->vd.tx.chan->device->dev;
+ struct pl08x_sg *dsg;
+
+ if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
+ if (txd->vd.tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
+ list_for_each_entry(dsg, &txd->dsg_list, node)
+ dma_unmap_single(dev, dsg->src_addr, dsg->len,
+ DMA_TO_DEVICE);
+ else {
+ list_for_each_entry(dsg, &txd->dsg_list, node)
+ dma_unmap_page(dev, dsg->src_addr, dsg->len,
+ DMA_TO_DEVICE);
+ }
+ }
+ if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
+ if (txd->vd.tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
+ list_for_each_entry(dsg, &txd->dsg_list, node)
+ dma_unmap_single(dev, dsg->dst_addr, dsg->len,
+ DMA_FROM_DEVICE);
+ else
+ list_for_each_entry(dsg, &txd->dsg_list, node)
+ dma_unmap_page(dev, dsg->dst_addr, dsg->len,
+ DMA_FROM_DEVICE);
+ }
+}
+
+static void pl08x_desc_free(struct virt_dma_desc *vd)
+{
+ struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
+ struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan);
+ struct pl08x_driver_data *pl08x = plchan->host;
+ unsigned long flags;
+
+ if (!plchan->slave)
+ pl08x_unmap_buffers(txd);
+
+ if (!txd->done)
+ pl08x_release_mux(plchan);
+
+ spin_lock_irqsave(&pl08x->lock, flags);
+ pl08x_free_txd(plchan->host, txd);
+ spin_unlock_irqrestore(&pl08x->lock, flags);
+}
+
static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
struct pl08x_dma_chan *plchan)
{
@@ -1087,9 +1130,8 @@ static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
while (!list_empty(&head)) {
txd = list_first_entry(&head, struct pl08x_txd, vd.node);
- pl08x_release_mux(plchan);
list_del(&txd->vd.node);
- pl08x_free_txd(pl08x, txd);
+ pl08x_desc_free(&txd->vd);
}
}
@@ -1534,9 +1576,7 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
}
/* Dequeue jobs and free LLIs */
if (plchan->at) {
- /* Killing this one off, release its mux */
- pl08x_release_mux(plchan);
- pl08x_free_txd(pl08x, plchan->at);
+ pl08x_desc_free(&plchan->at->vd);
plchan->at = NULL;
}
/* Dequeue jobs not yet fired as well */
@@ -1590,68 +1630,6 @@ static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
}
-static void pl08x_unmap_buffers(struct pl08x_txd *txd)
-{
- struct device *dev = txd->vd.tx.chan->device->dev;
- struct pl08x_sg *dsg;
-
- if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
- if (txd->vd.tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
- list_for_each_entry(dsg, &txd->dsg_list, node)
- dma_unmap_single(dev, dsg->src_addr, dsg->len,
- DMA_TO_DEVICE);
- else {
- list_for_each_entry(dsg, &txd->dsg_list, node)
- dma_unmap_page(dev, dsg->src_addr, dsg->len,
- DMA_TO_DEVICE);
- }
- }
- if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
- if (txd->vd.tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
- list_for_each_entry(dsg, &txd->dsg_list, node)
- dma_unmap_single(dev, dsg->dst_addr, dsg->len,
- DMA_FROM_DEVICE);
- else
- list_for_each_entry(dsg, &txd->dsg_list, node)
- dma_unmap_page(dev, dsg->dst_addr, dsg->len,
- DMA_FROM_DEVICE);
- }
-}
-
-static void pl08x_tasklet(unsigned long data)
-{
- struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
- struct pl08x_driver_data *pl08x = plchan->host;
- unsigned long flags;
- LIST_HEAD(head);
-
- spin_lock_irqsave(&plchan->vc.lock, flags);
- list_splice_tail_init(&plchan->done_list, &head);
- spin_unlock_irqrestore(&plchan->vc.lock, flags);
-
- while (!list_empty(&head)) {
- struct pl08x_txd *txd = list_first_entry(&head,
- struct pl08x_txd, node);
- dma_async_tx_callback callback = txd->vd.tx.callback;
- void *callback_param = txd->vd.tx.callback_param;
-
- list_del(&txd->node);
-
- /* Don't try to unmap buffers on slave channels */
- if (!plchan->slave)
- pl08x_unmap_buffers(txd);
-
- /* Free the descriptor */
- spin_lock_irqsave(&plchan->vc.lock, flags);
- pl08x_free_txd(pl08x, txd);
- spin_unlock_irqrestore(&plchan->vc.lock, flags);
-
- /* Callback to signal completion */
- if (callback)
- callback(callback_param);
- }
-}
-
static irqreturn_t pl08x_irq(int irq, void *dev)
{
struct pl08x_driver_data *pl08x = dev;
@@ -1694,8 +1672,8 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
* reservation.
*/
pl08x_release_mux(plchan);
- dma_cookie_complete(&tx->vd.tx);
- list_add_tail(&tx->node, &plchan->done_list);
+ tx->done = true;
+ vchan_cookie_complete(&tx->vd);
/*
* And start the next descriptor (if any),
@@ -1708,8 +1686,6 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
}
spin_unlock(&plchan->vc.lock);
- /* Schedule tasklet on this channel */
- tasklet_schedule(&plchan->tasklet);
mask |= (1 << i);
}
}
@@ -1769,10 +1745,7 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
"initialize virtual channel \"%s\"\n",
chan->name);
- INIT_LIST_HEAD(&chan->done_list);
- tasklet_init(&chan->tasklet, pl08x_tasklet,
- (unsigned long) chan);
-
+ chan->vc.desc_free = pl08x_desc_free;
vchan_init(&chan->vc, dmadev);
}
dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
--
1.7.4.4
More information about the linux-arm-kernel
mailing list