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iommu/rockchip: add max segment size for device

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The default max segment size is 64Kb, if memory that device
want to map larger than default then it will break to several times
mapping which may result in non-contiguous IOVA. So set to 4Gb

Change-Id: I22eb7f30a3f741689c8c32734509c34f99fd8100
Signed-off-by: Simon Xue <xxm@rock-chips.com>
This commit is contained in:
Simon Xue
2019-12-03 10:45:26 +08:00
committed by Tao Huang
parent f38a8b7992
commit b03102c010
1 changed files with 11 additions and 0 deletions
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11
drivers/iommu/rockchip-iommu.c
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@@ -1108,6 +1108,14 @@ static int rk_iommu_add_device(struct device *dev)
data->defer_attach = false;
/* set max segment size for dev, needed for single chunk map */
if (!dev->dma_parms)
dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
if (!dev->dma_parms)
return -ENOMEM;
dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
return 0;
}
@@ -1118,6 +1126,9 @@ static void rk_iommu_remove_device(struct device *dev)
iommu = rk_iommu_from_dev(dev);
kfree(dev->dma_parms);
dev->dma_parms = NULL;
device_link_del(data->link);
iommu_device_unlink(&iommu->iommu, dev);
iommu_group_remove_device(dev);