On Fri, Jul 31, 2015 at 06:18:28PM +0100, Robin Murphy wrote: > +/* > + * TODO: Right now __iommu_setup_dma_ops() gets called too early to do > + * everything it needs to - the device isn't yet fully created, and the > + * IOMMU driver hasn't seen it yet, so we need this delayed attachment > + * dance. Once IOMMU probe ordering is sorted to move the > + * arch_setup_dma_ops() call later, all the notifier bits below become > + * unnecessary, and will go away. > + */ > +struct iommu_dma_notifier_data { > + struct list_head list; > + struct device *dev; > + struct iommu_domain *dma_domain; > +}; > +static LIST_HEAD(iommu_dma_masters); > +static DEFINE_MUTEX(iommu_dma_notifier_lock);
Ugh, thats incredibly ugly. Why can't you do the setup work then the iommu driver sees the device? Just call the dma-api setup functions there (like the x86 iommu drivers do it too) and be done without any notifiers. > +static void __iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > + const struct iommu_ops *ops) > +{ > + struct iommu_domain *domain; > + int err; > + > + if (!ops) > + return; > + /* > + * In a perfect world, everything happened in the right order up to > + * here, and the IOMMU core has already attached the device to an > + * appropriate default domain for us to set up... > + */ > + domain = iommu_get_domain_for_dev(dev); > + if (!domain) { > + /* > + * Urgh. Reliable default domains for platform devices can't > + * happen anyway without some sensible way of handling > + * non-trivial groups. So until then, HORRIBLE HACKS! > + */ I don't get this, what is preventing to rely on default domains here? > + domain = ops->domain_alloc(IOMMU_DOMAIN_DMA); The IOMMU core should already tried to allocate an IOMMU_DOMAIN_DMA type domain. No need to try this again here. Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu