@@ -12,6 +12,7 @@
#include <linux/acpi_iort.h>
#include <linux/bitfield.h>
+#include <linux/dma-iommu.h>
#include <linux/iommu.h>
#include <linux/kernel.h>
#include <linux/list.h>
@@ -837,6 +838,43 @@ static inline int iort_add_device_replay(struct device *dev)
return err;
}
+/**
+ * iort_iommu_get_rmrs - Helper to retrieve RMR info associated with IOMMU
+ * @iommu: fwnode for the IOMMU
+ * @head: RMR list head to be populated
+ *
+ * Returns: 0 on success, <0 failure
+ */
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+ struct list_head *head)
+{
+ struct iort_rmr_entry *e;
+ struct acpi_iort_node *iommu;
+
+ iommu = iort_get_iort_node(iommu_fwnode);
+ if (!iommu)
+ return 0;
+
+ list_for_each_entry(e, &iort_rmr_list, list) {
+ struct acpi_iort_rmr_desc *rmr_desc;
+ struct iommu_rmr *rmr;
+
+ if (e->smmu != iommu)
+ continue;
+
+ rmr_desc = e->rmr_desc;
+ rmr = iommu_dma_alloc_rmr(rmr_desc->base_address,
+ rmr_desc->length, e->sid,
+ e->flags);
+ if (!rmr)
+ return -ENOMEM;
+
+ list_add_tail(&rmr->list, head);
+ }
+
+ return 0;
+}
+
/**
* iort_iommu_msi_get_resv_regions - Reserved region driver helper
* @dev: Device from iommu_get_resv_regions()
@@ -1107,6 +1145,8 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
const u32 *input_id)
{ return NULL; }
+int iort_iommu_get_rmrs(struct fwnode_handle *fwnode, struct list_head *head)
+{ return 0; }
#endif
static int nc_dma_get_range(struct device *dev, u64 *size)
@@ -201,6 +201,9 @@ EXPORT_SYMBOL(iommu_dma_get_resv_regions);
int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode,
struct list_head *list)
{
+ if (!is_of_node(iommu_fwnode))
+ return iort_iommu_get_rmrs(iommu_fwnode, list);
+
return 0;
}
EXPORT_SYMBOL(iommu_dma_get_rmrs);
@@ -39,6 +39,8 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
const u32 *id_in);
int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head);
phys_addr_t acpi_iort_dma_get_max_cpu_address(void);
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+ struct list_head *list);
#else
static inline void acpi_iort_init(void) { }
static inline u32 iort_msi_map_id(struct device *dev, u32 id)
@@ -59,6 +61,11 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
static inline phys_addr_t acpi_iort_dma_get_max_cpu_address(void)
{ return PHYS_ADDR_MAX; }
+
+static inline
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+ struct list_head *list)
+{ return 0; }
#endif
#endif /* __ACPI_IORT_H__ */
Add a helper function that retrieves RMR memory descriptors associated with a given IOMMU. This will be used by IOMMU drivers to setup necessary mappings. Now that we have this, invoke this from the generic helper interface. Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> --- drivers/acpi/arm64/iort.c | 40 +++++++++++++++++++++++++++++++++++++++ drivers/iommu/dma-iommu.c | 3 +++ include/linux/acpi_iort.h | 7 +++++++ 3 files changed, 50 insertions(+) -- 2.17.1