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iommu/dma: Add support for mapping MSIs

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When an MSI doorbell is located downstream of an IOMMU, attaching
devices to a DMA ops domain and switching on translation leads to a rude
shock when their attempt to write to the physical address returned by
the irqchip driver faults (or worse, writes into some already-mapped
buffer) and no interrupt is forthcoming.

Address this by adding a hook for relevant irqchip drivers to call from
their compose_msi_msg() callback, to swizzle the physical address with
an appropriatly-mapped IOVA for any device attached to one of our DMA
ops domains.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Robin Murphy 2016-09-12 17:13:59 +01:00 • committed by Will Deacon
parent 455eb7d34a
commit 44bb7e243b
4 changed files with 136 additions and 15 deletions
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9
include/linux/dma-iommu.h
View file

@ -21,6 +21,7 @@
#ifdef CONFIG_IOMMU_DMA
#include <linux/iommu.h>
#include <linux/msi.h>
int iommu_dma_init(void);
@ -62,9 +63,13 @@ void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
int iommu_dma_supported(struct device *dev, u64 mask);
int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
/* The DMA API isn't _quite_ the whole story, though... */
void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
#else
struct iommu_domain;
struct msi_msg;
static inline int iommu_dma_init(void)
{
@ -80,6 +85,10 @@ static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
{
}
static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
{
}
#endif /* CONFIG_IOMMU_DMA */
#endif /* __KERNEL__ */
#endif /* __DMA_IOMMU_H */