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authorDan Williams <dan.j.williams@intel.com>2007-01-02 11:10:43 -0700
committerDan Williams <dan.j.williams@intel.com>2007-07-13 08:06:11 -0700
commit7405f74badf46b5d023c5d2b670b4471525f6c91 (patch)
tree20dd20571637dba1c2b04c7b13ac208c33b5706b /drivers/dma/ioatdma.h
parent428ed6024fa74a271142f3257966e9b5e1cb37a1 (diff)
dmaengine: refactor dmaengine around dma_async_tx_descriptor
The current dmaengine interface defines mutliple routines per operation, i.e. dma_async_memcpy_buf_to_buf, dma_async_memcpy_buf_to_page etc. Adding more operation types (xor, crc, etc) to this model would result in an unmanageable number of method permutations. Are we really going to add a set of hooks for each DMA engine whizbang feature? - Jeff Garzik The descriptor creation process is refactored using the new common dma_async_tx_descriptor structure. Instead of per driver do_<operation>_<dest>_to_<src> methods, drivers integrate dma_async_tx_descriptor into their private software descriptor and then define a 'prep' routine per operation. The prep routine allocates a descriptor and ensures that the tx_set_src, tx_set_dest, tx_submit routines are valid. Descriptor creation and submission becomes: struct dma_device *dev; struct dma_chan *chan; struct dma_async_tx_descriptor *tx; tx = dev->device_prep_dma_<operation>(chan, len, int_flag) tx->tx_set_src(dma_addr_t, tx, index /* for multi-source ops */) tx->tx_set_dest(dma_addr_t, tx, index) tx->tx_submit(tx) In addition to the refactoring, dma_async_tx_descriptor also lays the groundwork for definining cross-channel-operation dependencies, and a callback facility for asynchronous notification of operation completion. Changelog: * drop dma mapping methods, suggested by Chris Leech * fix ioat_dma_dependency_added, also caught by Andrew Morton * fix dma_sync_wait, change from Andrew Morton * uninline large functions, change from Andrew Morton * add tx->callback = NULL to dmaengine calls to interoperate with async_tx calls * hookup ioat_tx_submit * convert channel capabilities to a 'cpumask_t like' bitmap * removed DMA_TX_ARRAY_INIT, no longer needed * checkpatch.pl fixes * make set_src, set_dest, and tx_submit descriptor specific methods * fixup git-ioat merge * move group_list and phys to dma_async_tx_descriptor Cc: Jeff Garzik <jeff@garzik.org> Cc: Chris Leech <christopher.leech@intel.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/dma/ioatdma.h')
-rw-r--r--drivers/dma/ioatdma.h13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index 62b26a9be4c..d3f69bb15fa 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -105,21 +105,20 @@ struct ioat_dma_chan {
/**
* struct ioat_desc_sw - wrapper around hardware descriptor
* @hw: hardware DMA descriptor
- * @node:
- * @cookie:
- * @phys:
+ * @node: this descriptor will either be on the free list,
+ * or attached to a transaction list (async_tx.tx_list)
+ * @tx_cnt: number of descriptors required to complete the transaction
+ * @async_tx: the generic software descriptor for all engines
*/
-
struct ioat_desc_sw {
struct ioat_dma_descriptor *hw;
struct list_head node;
- dma_cookie_t cookie;
- dma_addr_t phys;
+ int tx_cnt;
DECLARE_PCI_UNMAP_ADDR(src)
DECLARE_PCI_UNMAP_LEN(src_len)
DECLARE_PCI_UNMAP_ADDR(dst)
DECLARE_PCI_UNMAP_LEN(dst_len)
+ struct dma_async_tx_descriptor async_tx;
};
#endif /* IOATDMA_H */
-