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

[Dmitry Kalinkin]

> On 08 Jul 2015, at 16:57, Martyn Welch <martyn.we...@ge.com> wrote:
> 
> 
> 
> 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.
Latency-critical windows can be statically allocated using current resource 
based API.
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel