iommu: Add iova and size as parameters in iotlb_sync_map

iotlb_sync_map allow IOMMU drivers tlb sync after completing the whole
mapping. This patch adds iova and size as the parameters in it. then the
IOMMU driver could flush tlb with the whole range once after iova mapping
to improve performance.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210107122909.16317-3-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c304a6a..3d099a3 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2443,7 +2443,7 @@ static int _iommu_map(struct iommu_domain *domain, unsigned long iova,
 
        ret = __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL);
        if (ret == 0 && ops->iotlb_sync_map)
-               ops->iotlb_sync_map(domain);
+               ops->iotlb_sync_map(domain, iova, size);
 
        return ret;
 }
@@ -2575,7 +2575,7 @@ static size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
        }
 
        if (ops->iotlb_sync_map)
-               ops->iotlb_sync_map(domain);
+               ops->iotlb_sync_map(domain, iova, mapped);
        return mapped;
 
 out_err:

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index fac7202..05e8e19 100644 (file)
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -261,7 +261,8 @@ static int gart_iommu_of_xlate(struct device *dev,
        return 0;
 }
 
-static void gart_iommu_sync_map(struct iommu_domain *domain)
+static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+                               size_t size)
 {
        FLUSH_GART_REGS(gart_handle);
 }
@@ -269,7 +270,9 @@ static void gart_iommu_sync_map(struct iommu_domain *domain)
 static void gart_iommu_sync(struct iommu_domain *domain,
                            struct iommu_iotlb_gather *gather)
 {
-       gart_iommu_sync_map(domain);
+       size_t length = gather->end - gather->start;
+
+       gart_iommu_sync_map(domain, gather->start, length);
 }
 
 static const struct iommu_ops gart_iommu_ops = {

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b3f0e20..9ce0aa9 100644 (file)
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -246,7 +246,8 @@ struct iommu_ops {
        size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
                     size_t size, struct iommu_iotlb_gather *iotlb_gather);
        void (*flush_iotlb_all)(struct iommu_domain *domain);
-       void (*iotlb_sync_map)(struct iommu_domain *domain);
+       void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
+                              size_t size);
        void (*iotlb_sync)(struct iommu_domain *domain,
                           struct iommu_iotlb_gather *iotlb_gather);
        phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);