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: Mitchel Humpherys <mitchelh@codeaurora.org>

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 303768c..a41f341 100644 (file)
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -173,6 +173,7 @@ struct iommu_dm_region {
  * @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
  * @priv: per-instance data private to the iommu driver
  */
 struct iommu_ops {
@@ -220,6 +221,7 @@ 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);
 
 #ifdef CONFIG_OF_IOMMU
        int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
@@ -382,6 +384,12 @@ 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 {};
@@ -626,6 +634,10 @@ static int iommu_dma_supported(struct iommu_domain *domain, struct device *dev,
        return -EINVAL;
 }
 
+static inline void iommu_tlbiall(struct iommu_domain *domain)
+{
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 #endif /* __LINUX_IOMMU_H */