Commit ab1d5281 authored by Yong Wu's avatar Yong Wu Committed by Will Deacon
Browse files

iommu/mediatek: Add iova reserved function 



For multiple iommu_domains, we need to reserve some iova regions. Take a
example, If the default iova region is 0 ~ 4G, but the 0x4000_0000 ~
0x43ff_ffff is only for the special CCU0 domain. Thus we should exclude
this region for the default iova region.

Signed-off-by: default avatarAnan sun <anan.sun@mediatek.com>
Signed-off-by: default avatarChao Hao <chao.hao@mediatek.com>
Signed-off-by: default avatarYong Wu <yong.wu@mediatek.com>
Reviewed-by: default avatarTomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-30-yong.wu@mediatek.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent c3045f39

drivers/iommu/mtk_iommu.c

+31 −0
Original line number Diff line number Diff line
@@ -626,6 +626,35 @@ static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) 
	return iommu_fwspec_add_ids(dev, args->args, 1);

}



static void mtk_iommu_get_resv_regions(struct device *dev,

				       struct list_head *head)

{

	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);

	unsigned int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;

	const struct mtk_iommu_iova_region *resv, *curdom;

	struct iommu_resv_region *region;

	int prot = IOMMU_WRITE | IOMMU_READ;



	if (domid < 0)

		return;

	curdom = data->plat_data->iova_region + domid;

	for (i = 0; i < data->plat_data->iova_region_nr; i++) {

		resv = data->plat_data->iova_region + i;



		/* Only reserve when the region is inside the current domain */

		if (resv->iova_base <= curdom->iova_base ||

		    resv->iova_base + resv->size >= curdom->iova_base + curdom->size)

			continue;



		region = iommu_alloc_resv_region(resv->iova_base, resv->size,

						 prot, IOMMU_RESV_RESERVED);

		if (!region)

			return;



		list_add_tail(&region->list, head);

	}

}



static const struct iommu_ops mtk_iommu_ops = {

	.domain_alloc	= mtk_iommu_domain_alloc,

	.domain_free	= mtk_iommu_domain_free,
@@ -641,6 +670,8 @@ static const struct iommu_ops mtk_iommu_ops = { 
	.release_device	= mtk_iommu_release_device,

	.device_group	= mtk_iommu_device_group,

	.of_xlate	= mtk_iommu_of_xlate,

	.get_resv_regions = mtk_iommu_get_resv_regions,

	.put_resv_regions = generic_iommu_put_resv_regions,

	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,

};