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>
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 1590602..7e4a785 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -212,6 +212,18 @@
} 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 @@
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 @@
*/
#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 @@
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,
