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| author | Shannon Nelson <shannon.nelson@intel.com> | 2007-10-18 03:07:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 14:37:32 -0700 |
| commit | 952184304fbf030f0133d8b66a91b2847dce729e (patch) | |
| tree | 07a6ca0121cfa94bda58c0f49ac509f4b62fcf64 | |
| parent | 7f2b291f56d08e001454d16d3c92e175434898b3 (diff) | |
| download | op-kernel-dev-952184304fbf030f0133d8b66a91b2847dce729e.zip op-kernel-dev-952184304fbf030f0133d8b66a91b2847dce729e.tar.gz | |
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>
| -rw-r--r-- | drivers/dma/ioat_dma.c | 25 |
1 files changed, 25 insertions, 0 deletions
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 @@ 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, |
