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rapidio/tsi721_dma: add channel mask and queue size parameters

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Add module parameters to allow load time configuration of DMA channels.

Depending on application, performance of DMA data transfers can benefit
from adjusted sizes of buffer descriptor ring and/or transaction
requests queue.

Having HW DMA channel selector mask allows to define which channels
(from seven available) are controlled by the mport device driver and
reserve some of them for direct use by other drivers.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Alexandre Bounine <[email protected]>
Tested-by: Barry Wood <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Andre van Herk <[email protected]>
Cc: Barry Wood <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexandre Bounine 2016-08-02 14:06:37 -07:00 • committed by Linus Torvalds
commit 4498c31adf
3 changed files with 32 additions and 10 deletions
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14
Documentation/rapidio/tsi721.txt
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@ -25,6 +25,20 @@ fully compatible with RIONET driver (Ethernet over RapidIO messaging services).
This parameter can be changed dynamically.
Use CONFIG_RAPIDIO_DEBUG=y to enable debug output at the top level.
- 'dma_desc_per_channel' - This parameter defines number of hardware buffer
descriptors allocated for each registered Tsi721 DMA channel.
Its default value is 128.
- 'dma_txqueue_sz' - DMA transactions queue size. Defines number of pending
transaction requests that can be accepted by each DMA channel.
Default value is 16.
- 'dma_sel' - DMA channel selection mask. Bitmask that defines which hardware
DMA channels (0 ... 6) will be registered with DmaEngine core.
If bit is set to 1, the corresponding DMA channel will be registered.
DMA channels not selected by this mask will not be used by this device
driver. Default value is 0x7f (use all channels).
II. Known problems
None.