From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: ulf.hansson@linaro.org, hch@lst.de, m.szyprowski@samsung.com,
robin.murphy@arm.com, joro@8bytes.org, axboe@kernel.dk
Cc: linux-renesas-soc@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-block@vger.kernel.org, wsa+renesas@sang-engineering.com,
iommu@lists.linux-foundation.org
Subject: [PATCH v10 2/4] iommu/dma: Add a new dma_map_ops of get_merge_boundary()
Date: Wed, 28 Aug 2019 21:35:41 +0900 [thread overview]
Message-ID: <1566995743-5614-3-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw)
In-Reply-To: <1566995743-5614-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>
This patch adds a new dma_map_ops of get_merge_boundary() to
expose the DMA merge boundary if the domain type is IOMMU_DOMAIN_DMA.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/dma-iommu.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index de68b4a..ad861bd 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1091,6 +1091,13 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
return ret;
}
+static unsigned long iommu_dma_get_merge_boundary(struct device *dev)
+{
+ struct iommu_domain *domain = iommu_get_dma_domain(dev);
+
+ return (1UL << __ffs(domain->pgsize_bitmap)) - 1;
+}
+
static const struct dma_map_ops iommu_dma_ops = {
.alloc = iommu_dma_alloc,
.free = iommu_dma_free,
@@ -1106,6 +1113,7 @@ static const struct dma_map_ops iommu_dma_ops = {
.sync_sg_for_device = iommu_dma_sync_sg_for_device,
.map_resource = iommu_dma_map_resource,
.unmap_resource = iommu_dma_unmap_resource,
+ .get_merge_boundary = iommu_dma_get_merge_boundary,
};
/*
--
2.7.4
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next prev parent reply other threads:[~2019-08-28 12:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-28 12:35 [PATCH v10 0/4] treewide: improve R-Car SDHI performance Yoshihiro Shimoda
2019-08-28 12:35 ` [PATCH v10 1/4] dma: Introduce dma_get_merge_boundary() Yoshihiro Shimoda
2019-08-28 12:35 ` Yoshihiro Shimoda [this message]
2019-08-28 12:35 ` [PATCH v10 3/4] block: add a helper function to merge the segments Yoshihiro Shimoda
2019-09-02 21:47 ` Jens Axboe
2019-09-03 4:59 ` Yoshihiro Shimoda
2019-09-03 6:33 ` hch
2019-09-03 6:42 ` Yoshihiro Shimoda
2019-08-28 12:35 ` [PATCH v10 4/4] mmc: queue: Use bigger segments if DMA MAP layer can " Yoshihiro Shimoda
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