lkml.org 
[lkml]   [2018]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH] dma-mapping: move dma configuration to bus infrastructure
Date


> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@lst.de]
> Sent: Tuesday, March 13, 2018 13:05
> > +int amba_dma_configure(struct device *dev)
> > +{
> > + enum dev_dma_attr attr;
> > + int ret = 0;
> > +
> > + if (dev->of_node) {
> > + ret = of_dma_configure(dev, dev->of_node);
> > + } else if (has_acpi_companion(dev)) {
> > + attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
> > + if (attr != DEV_DMA_NOT_SUPPORTED)
> > + ret = acpi_dma_configure(dev, attr);
> > + }
> > +
> > + return ret;
>
> This code sniplet is duplicated so many times that I think we should
> just have some sort of dma_common_configure() for it that the various
> busses can use.

Agree. There is no good point in duplicating the code.
So this new API will be part of 'drivers/base/dma-mapping.c' file?

>
> > +void amba_dma_deconfigure(struct device *dev)
> > +{
> > + of_dma_deconfigure(dev);
> > + acpi_dma_deconfigure(dev);
> > +}
>
> As mention in my previous reply I think we don't even need a deconfigure
> callback at this point - just remove the ACPI and OF wrappers and
> clear the dma ops.
>
> Also in this series we should replace the force_dma flag by use of the
> proper method, e.g. give a force parameter to of_dma_configure and the
> new dma_common_configure helper that the busses that want it can set.

I am more inclined to what Robin states in other mail to keep symmetry.
i.e. to keep dma_configure() and dma_deconfigure() and call
dev->bus->dma_configure from dma_configure(). Is this okay?

Thanks,
Nipun

\
 
 \ /
  Last update: 2018-03-13 17:00    [W:0.700 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site