[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages
On Thu, Sep 12, 2013 at 03:44:50PM +0100, Stefano Stabellini wrote: > On Thu, 12 Sep 2013, Catalin Marinas wrote: > > On Wed, Sep 11, 2013 at 06:34:17PM +0100, Stefano Stabellini wrote: > > > On Wed, 11 Sep 2013, Catalin Marinas wrote: > > > > static inline void set_dma_ops(struct device *dev, struct dma_map_ops > > > > *ops) > > > > { > > > > BUG_ON(!dev); > > > > @@ -32,7 +39,7 @@ static inline void set_dma_ops(struct device *dev, > > > > struct dma_map_ops *ops) > > > > > > > > static inline int dma_set_mask(struct device *dev, u64 mask) > > > > { > > > > - return get_dma_ops(dev)->set_dma_mask(dev, mask); > > > > + return __get_dma_ops(dev)->set_dma_mask(dev, mask); > > > > } > > > > > > > > #ifdef __arch_page_to_dma > > > > > > I don't understand the reason for this change though: shouldn't > > > set_dma_mask go via the "default" (whatever that is), like the others? > > > > Under Xen, this would mean xen_dma_ops->set_dma_mask(). I thought you > > want to set the default dma address. > > > > I can see why you may want set_dma_mask() for xen_dma_ops but in also > > needs to be passed to __get_dma_ops(dev)->set_dma_ops() otherwise the > > actual dma_alloc_attrs() will miss the mask (and on arm64 it does > > bouncing via swiotlb). > > xen_dma_ops->set_dma_mask() is implemented by > drivers/xen/swiotlb-xen.c:xen_swiotlb_set_dma_mask (provided by this > patch series). The function takes care of setting: > > *dev->dma_mask = dma_mask; > > I think that should be enough to make dma_alloc_attrs happy. I think it would be safer to call __get_dma_ops()->set_dma_mask() in case the driver overrides that and does more than dev->dma_mask setting. I don't know whether this is the case though. -- Catalin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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