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authorShannon Nelson <shannon.nelson@intel.com>2007-10-18 03:07:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:32 -0700
commit952184304fbf030f0133d8b66a91b2847dce729e (patch)
tree07a6ca0121cfa94bda58c0f49ac509f4b62fcf64 /drivers/dma
parent7f2b291f56d08e001454d16d3c92e175434898b3 (diff)
downloadblackbird-op-linux-952184304fbf030f0133d8b66a91b2847dce729e.tar.gz
blackbird-op-linux-952184304fbf030f0133d8b66a91b2847dce729e.zip
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ioat_dma.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 15906027c8de..7e4a785c2dff 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 */
@@ -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,
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