On Wed, 17 Oct 2007 17:14:39 -0700
Shannon Nelson <[email protected]> wrote:
> The async_tx interface includes a completion callback. This adds support
> for using that callback, including using interrupts on completion.
>
> Signed-off-by: Shannon Nelson <[email protected]>
> ---
>
> drivers/dma/ioat_dma.c | 26 ++++++++++++++++++++++++++
> 1 files changed, 26 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
> index 117ac38..f560527 100644
> --- a/drivers/dma/ioat_dma.c
> +++ b/drivers/dma/ioat_dma.c
> @@ -212,6 +212,18 @@ static dma_cookie_t ioat_tx_submit(struct dma_async_tx_descriptor *tx)
> } while (len && (new = ioat_dma_get_next_descriptor(ioat_chan)));
>
> hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
> + if (new->async_tx.callback) {
> + hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN;
> + if (first != new) {
> + /* move callback into to last desc */
> + new->async_tx.callback = first->async_tx.callback;
> + new->async_tx.callback_param
> + = first->async_tx.callback_param;
> + first->async_tx.callback = NULL;
> + first->async_tx.callback_param = NULL;
> + }
> + }
> +
> new->tx_cnt = desc_count;
> new->async_tx.ack = orig_ack; /* client is in control of this ack */
>
> @@ -516,6 +528,11 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
> pci_unmap_addr(desc, src),
> pci_unmap_len(desc, len),
> PCI_DMA_TODEVICE);
> + if (desc->async_tx.callback) {
> + desc->async_tx.callback(
> + desc->async_tx.callback_param);
> + desc->async_tx.callback = NULL;
> + }
> }
>
> if (desc->async_tx.phys != phys_complete) {
> @@ -637,6 +654,13 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
> */
> #define IOAT_TEST_SIZE 2000
>
> +static dma_async_tx_callback ioat_dma_test_callback(void *dma_async_param)
> +{
> + printk(KERN_ERR "ioatdma: ioat_dma_test_callback(0x%04llx)\n",
> + (u64)dma_async_param);
> + return 0;
> +}
This wanted to be `return NULL'. I'll fix.
> /**
> * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
> * @device: device to be tested
> @@ -691,6 +715,8 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
> addr = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE,
> DMA_FROM_DEVICE);
> ioat_set_dest(addr, tx, 0);
> + tx->callback = (void *)ioat_dma_test_callback;
This cast is unneeded, surely? It had better be..
> + tx->callback_param = (void *)0x8086;
eh?
> cookie = ioat_tx_submit(tx);
> if (cookie < 0) {
> dev_err(&device->pdev->dev,
-
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