Reserved Memory Regions(RMR) associated with an IOMMU may be
described either through ACPI tables or DT in systems with
devices that require a unity mapping or bypass for those
regions in IOMMU drivers.
Introduce a generic interface so that IOMMU drivers can retrieve
and set up necessary mappings.
Signed-off-by: Shameer Kolothum <shameerali.kolothum.th...@huawei.com>
---
drivers/iommu/dma-iommu.c | 33 +++++++++++++++++++++++++++++++++
include/linux/dma-iommu.h | 8 ++++++++
include/linux/iommu.h | 19 +++++++++++++++++++
3 files changed, 60 insertions(+)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index af765c813cc8..86a1e48b1fe8 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -191,6 +191,39 @@ void iommu_dma_get_resv_regions(struct device *dev, struct
list_head *list)
}
EXPORT_SYMBOL(iommu_dma_get_resv_regions);
+/**
+ * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated
+ * with a given IOMMU
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @list: RMR list to be populated
+ *
+ */
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode,
+ struct list_head *list)
+{
+ return 0;
+}
+EXPORT_SYMBOL(iommu_dma_get_rmrs);
+
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid,
+ u32 flags)
+{
+ struct iommu_rmr *rmr;
+
+ rmr = kzalloc(sizeof(*rmr), GFP_KERNEL);
+ if (!rmr)
+ return NULL;
+
+ INIT_LIST_HEAD(&rmr->list);
+ rmr->base_address = base;
+ rmr->length = length;
+ rmr->sid = sid;
+ rmr->flags = flags;
+
+ return rmr;
+}
+EXPORT_SYMBOL(iommu_dma_alloc_rmr);
+
static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie,
phys_addr_t start, phys_addr_t end)
{
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 706b68d1359b..beb84c4fe5b1 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -40,6 +40,9 @@ void iommu_dma_get_resv_regions(struct device *dev, struct
list_head *list);
void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
struct iommu_domain *domain);
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, u32
flags);
+
#else /* CONFIG_IOMMU_DMA */
struct iommu_domain;
@@ -86,5 +89,10 @@ static inline void iommu_dma_free_cpu_cached_iovas(unsigned
int cpu,
{
}
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+{
+ return 0;
+}
+
#endif /* CONFIG_IOMMU_DMA */
#endif /* __DMA_IOMMU_H */
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5e7fe519430a..fb8820c40144 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -595,6 +595,25 @@ struct iommu_sva {
struct device *dev;
};
+/**
+ * struct iommu_rmr - Reserved Memory Region details per IOMMU
+ * @list: Linked list pointers to hold RMR region info
+ * @base_address: base address of Reserved Memory Region
+ * @length: length of memory region
+ * @sid: associated stream id
+ * @flags: flags that apply to the RMR node
+ */
+struct iommu_rmr {
+ struct list_head list;
+ phys_addr_t base_address;
+ u64 length;
+ u32 sid;
+ u32 flags;
+};
+
+/* RMR Remap permitted */
+#define IOMMU_RMR_REMAP_PERMITTED (1 << 0)
+
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
--
2.17.1
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