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authorDan Williams <dan.j.williams@intel.com>2007-07-09 11:56:42 -0700
committerDan Williams <dan.j.williams@intel.com>2007-07-13 08:06:13 -0700
commitd379b01e9087a582d58f4b678208a4f8d8376fe7 (patch)
tree155920bca93c18afba66b9d5acfecd359d5bec65 /crypto/async_tx/Makefile
parent7405f74badf46b5d023c5d2b670b4471525f6c91 (diff)
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dmaengine: make clients responsible for managing channels
The current implementation assumes that a channel will only be used by one client at a time. In order to enable channel sharing the dmaengine core is changed to a model where clients subscribe to channel-available-events. Instead of tracking how many channels a client wants and how many it has received the core just broadcasts the available channels and lets the clients optionally take a reference. The core learns about the clients' needs at dma_event_callback time. In support of multiple operation types, clients can specify a capability mask to only be notified of channels that satisfy a certain set of capabilities. Changelog: * removed DMA_TX_ARRAY_INIT, no longer needed * dma_client_chan_free -> dma_chan_release: switch to global reference counting only at device unregistration time, before it was also happening at client unregistration time * clients now return dma_state_client to dmaengine (ack, dup, nak) * checkpatch.pl fixes * fixup merge with git-ioat 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>
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