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I/OAT: Add completion callback for async_tx interface use 

The async_tx interface includes a completion callback.  This adds support
for using that callback, including using interrupts on completion.

[akpm@linux-foundation.org: various fixes]
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shannon Nelson 2007-10-18 03:07:15 -07:00 committed by Linus Torvalds
parent 7f2b291f56
commit 952184304f
1 changed files with 25 additions and 0 deletions
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25
drivers/dma/ioat_dma.c
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@ -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 */
@ -517,6 +529,11 @@ 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) {
@ -638,6 +655,12 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
*/
#define IOAT_TEST_SIZE 2000
static void ioat_dma_test_callback(void *dma_async_param)
{
printk(KERN_ERR "ioatdma: ioat_dma_test_callback(%p)\n",
dma_async_param);
}
/**
* ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
* @device: device to be tested
@ -692,6 +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 = ioat_dma_test_callback;
tx->callback_param = (void *)0x8086;
cookie = ioat_tx_submit(tx);
if (cookie < 0) {
dev_err(&device->pdev->dev,