Re: [PATCHv3 08/16] staging: vme_user: provide DMA functionality

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On 07/07/15 11:52, Dmitry Kalinkin wrote:
The API I had in mind would have only vme_master_read and
vme_master_write that would take absolute addresses (not relative to
any window). These variants of access functions would then try to
reuse any window that is already able to serve the request or wait
for a free window and reconfigure it for the need of the request.

I'm a little concerned by the latency this might cause, especially if there is one device which is negatively affected by latency. Handling RORA interrupts would be "interesting" if all the windows were dynamically allocated at the time at which an interrupt came in.

Martyn

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