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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 /drivers/dma/ioatdma.h
parent7405f74badf46b5d023c5d2b670b4471525f6c91 (diff)
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>
Diffstat (limited to 'drivers/dma/ioatdma.h')
-rw-r--r--drivers/dma/ioatdma.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index d3f69bb15fa..d3726478031 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -30,9 +30,6 @@
#define IOAT_LOW_COMPLETION_MASK 0xffffffc0
-extern struct list_head dma_device_list;
-extern struct list_head dma_client_list;
-
/**
* struct ioat_device - internal representation of a IOAT device
* @pdev: PCI-Express device