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Commit 39bad0c4 authored by Mitchel Humpherys's avatar Mitchel Humpherys Committed by Patrick Daly
Browse files

iommu: Add tlbi_domain op 



Some higher-level DMA mappers might be able to squeeze out more
performance if TLB invalidation can be delegated to them, since they
might have more knowledge about when a stale TLB is problem than the
IOMMU driver.  Add a callback for this purpose that can be implemented
by individual IOMMU drivers.

CRs-Fixed: 997751
Change-Id: If817f5514fdd5d24b9c592440760b81b88ec71a8
Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 86a560e8

include/linux/iommu.h

+12 −0
Original line number Diff line number Diff line
@@ -181,6 +181,7 @@ extern struct dentry *iommu_debugfs_top; 
 * @trigger_fault: trigger a fault on the device attached to an iommu domain

 * @reg_read: read an IOMMU register

 * @reg_write: write an IOMMU register

 * @tlbi_domain: Invalidate all TLBs covering an iommu domain

 */

struct iommu_ops {

	bool (*capable)(enum iommu_cap);
@@ -227,6 +228,7 @@ struct iommu_ops { 
				  unsigned long offset);

	void (*reg_write)(struct iommu_domain *domain, unsigned long val,

			  unsigned long offset);

	void (*tlbi_domain)(struct iommu_domain *domain);



	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
@@ -376,6 +378,12 @@ extern struct iommu_group *pci_device_group(struct device *dev); 
/* Generic device grouping function */

extern struct iommu_group *generic_device_group(struct device *dev);



static inline void iommu_tlbiall(struct iommu_domain *domain)

{

	if (domain->ops->tlbi_domain)

		domain->ops->tlbi_domain(domain);

}



#else /* CONFIG_IOMMU_API */



struct iommu_ops {};
@@ -608,6 +616,10 @@ static inline void iommu_reg_write(struct iommu_domain *domain, 
{

}



static inline void iommu_tlbiall(struct iommu_domain *domain)

{

}



#endif /* CONFIG_IOMMU_API */



#endif /* __LINUX_IOMMU_H */