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 <[email protected]> --- drivers/acpi/arm64/iort.c | 60 +++++++++++++++++++++++++++++++++++++++ drivers/iommu/dma-iommu.c | 3 ++ include/linux/acpi_iort.h | 6 ++++ 3 files changed, 69 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index a9705aa35028..d1a2b09230ab 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -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> @@ -842,6 +843,63 @@ 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 iort_rmr_id *rmr_ids = e->rmr_ids; + struct acpi_iort_rmr_desc *rmr_desc; + struct iommu_rmr *rmr; + u32 *ids, num_ids = 0; + int i, j = 0; + + for (i = 0; i < e->rmr_ids_num; i++) { + if (rmr_ids[i].smmu == iommu) + num_ids++; + } + + if (!num_ids) + continue; + + ids = kmalloc_array(num_ids, sizeof(*ids), GFP_KERNEL); + if (!ids) + return -ENOMEM; + + for (i = 0; i < e->rmr_ids_num; i++) { + if (rmr_ids[i].smmu == iommu) + ids[j++] = rmr_ids[i].sid; + } + + rmr_desc = e->rmr_desc; + rmr = iommu_dma_alloc_rmr(rmr_desc->base_address, + rmr_desc->length, + ids, num_ids); + if (!rmr) { + kfree(ids); + return -ENOMEM; + } + + list_add_tail(&rmr->list, head); + kfree(ids); + } + + return 0; +} + /** * iort_iommu_msi_get_resv_regions - Reserved region driver helper * @dev: Device from iommu_get_resv_regions() @@ -1112,6 +1170,8 @@ 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) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index d73768ecdd1a..aa8304e50786 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -176,6 +176,9 @@ 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); diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 20a32120bb88..0b61b98a4941 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -38,6 +38,8 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size); 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); +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) @@ -55,6 +57,10 @@ static inline const struct iommu_ops *iort_iommu_configure_id( static inline int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) { return 0; } +static inline +int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ return 0; } #endif #endif /* __ACPI_IORT_H__ */ -- 2.17.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
