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Subject[PATCH v2 17/19] iommu/mediatek: Add iova reserved function
Date
For multiple iommu_domains, we need to reserve some iova
regions, so we will add mtk_iommu_resv_iova_region structure.
It includes the start address and size of iova and iommu_resv_type.
Based on the function, we will realize multiple mtk_iommu_domains

Signed-off-by: Anan Sun <anan.sun@mediatek.com>
Signed-off-by: Chao Hao <chao.hao@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 47 +++++++++++++++++++++++++++++++++++++++
drivers/iommu/mtk_iommu.h | 12 ++++++++++
2 files changed, 59 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 9a7f2a388e3e..ac658fa16136 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -691,6 +691,51 @@ static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
return iommu_fwspec_add_ids(dev, args->args, 1);
}

+/* reserve/dir-map iova region */
+static void mtk_iommu_get_resv_regions(struct device *dev,
+ struct list_head *head)
+{
+ struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
+ unsigned int i, total_cnt = data->plat_data->resv_cnt;
+ const struct mtk_iommu_resv_iova_region *resv_data;
+ struct iommu_resv_region *region;
+ unsigned long base = 0;
+ size_t size = 0;
+ int prot = IOMMU_WRITE | IOMMU_READ;
+
+ resv_data = data->plat_data->resv_region;
+
+ for (i = 0; i < total_cnt; i++) {
+ size = 0;
+ if (resv_data[i].iova_size) {
+ base = (unsigned long)resv_data[i].iova_base;
+ size = resv_data[i].iova_size;
+ }
+ if (!size)
+ continue;
+
+ region = iommu_alloc_resv_region(base, size, prot,
+ resv_data[i].type);
+ if (!region)
+ return;
+
+ list_add_tail(&region->list, head);
+
+ dev_dbg(data->dev, "%s iova 0x%x ~ 0x%x\n",
+ (resv_data[i].type == IOMMU_RESV_DIRECT) ? "dm" : "rsv",
+ (unsigned int)base, (unsigned int)(base + size - 1));
+ }
+}
+
+static void mtk_iommu_put_resv_regions(struct device *dev,
+ struct list_head *head)
+{
+ struct iommu_resv_region *entry, *next;
+
+ list_for_each_entry_safe(entry, next, head, list)
+ kfree(entry);
+}
+
static const struct iommu_ops mtk_iommu_ops = {
.domain_alloc = mtk_iommu_domain_alloc,
.domain_free = mtk_iommu_domain_free,
@@ -705,6 +750,8 @@ static const struct iommu_ops mtk_iommu_ops = {
.remove_device = mtk_iommu_remove_device,
.device_group = mtk_iommu_device_group,
.of_xlate = mtk_iommu_of_xlate,
+ .get_resv_regions = mtk_iommu_get_resv_regions,
+ .put_resv_regions = mtk_iommu_put_resv_regions,
.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
};

diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index a38b26018abe..7f4d498ec5f6 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -36,6 +36,12 @@ enum mtk_iommu_plat {
M4U_MT8183,
};

+struct mtk_iommu_resv_iova_region {
+ dma_addr_t iova_base;
+ size_t iova_size;
+ enum iommu_resv_type type;
+};
+
/*
* reserved IOVA Domain for IOMMU users of HW limitation.
*/
@@ -68,6 +74,12 @@ struct mtk_iommu_plat_data {
u32 inv_sel_reg;
unsigned char larbid_remap[2][MTK_LARB_NR_MAX];
const struct mtk_domain_data *dom_data;
+ /*
+ * reserve/dir-mapping iova region data
+ * todo: for different reserve needs on multiple iommu domains
+ */
+ const unsigned int resv_cnt;
+ const struct mtk_iommu_resv_iova_region *resv_region;
};

struct mtk_iommu_domain;
--
2.18.0
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