diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/generic_pt/iommu.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/generic_pt/iommu.h b/include/linux/generic_pt/iommu.h index ceb6bc9cea37..0d59423024d5 100644 --- a/include/linux/generic_pt/iommu.h +++ b/include/linux/generic_pt/iommu.h @@ -11,6 +11,7 @@ struct iommu_iotlb_gather; struct pt_iommu_ops; +struct pt_iommu_driver_ops; /** * DOC: IOMMU Radix Page Table @@ -44,6 +45,12 @@ struct pt_iommu { const struct pt_iommu_ops *ops; /** + * @driver_ops: Function pointers provided by the HW driver to help + * manage HW details like caches. + */ + const struct pt_iommu_driver_ops *driver_ops; + + /** * @nid: Node ID to use for table memory allocations. The IOMMU driver * may want to set the NID to the device's NID, if there are multiple * table walkers. @@ -84,6 +91,53 @@ struct pt_iommu_ops { void (*deinit)(struct pt_iommu *iommu_table); }; +/** + * struct pt_iommu_driver_ops - HW IOTLB cache flushing operations + * + * The IOMMU driver should implement these using container_of(iommu_table) to + * get to it's iommu_domain derived structure. All ops can be called in atomic + * contexts as they are buried under DMA API calls. + */ +struct pt_iommu_driver_ops { + /** + * @change_top: Update the top of table pointer + * @iommu_table: Table to operate on + * @top_paddr: New CPU physical address of the top pointer + * @top_level: IOMMU PT level of the new top + * + * Called under the get_top_lock() spinlock. The driver must update all + * HW references to this domain with a new top address and + * configuration. On return mappings placed in the new top must be + * reachable by the HW. + * + * top_level encodes the level in IOMMU PT format, level 0 is the + * smallest page size increasing from there. This has to be translated + * to any HW specific format. During this call the new top will not be + * visible to any other API. + * + * This op is only used by PT_FEAT_DYNAMIC_TOP, and is required if + * enabled. + */ + void (*change_top)(struct pt_iommu *iommu_table, phys_addr_t top_paddr, + unsigned int top_level); + + /** + * @get_top_lock: lock to hold when changing the table top + * @iommu_table: Table to operate on + * + * Return a lock to hold when changing the table top page table from + * being stored in HW. The lock will be held prior to calling + * change_top() and released once the top is fully visible. + * + * Typically this would be a lock that protects the iommu_domain's + * attachment list. + * + * This op is only used by PT_FEAT_DYNAMIC_TOP, and is required if + * enabled. + */ + spinlock_t *(*get_top_lock)(struct pt_iommu *iommu_table); +}; + static inline void pt_iommu_deinit(struct pt_iommu *iommu_table) { /* @@ -120,6 +174,10 @@ struct pt_iommu_cfg { #define IOMMU_PROTOTYPES(fmt) \ phys_addr_t pt_iommu_##fmt##_iova_to_phys(struct iommu_domain *domain, \ dma_addr_t iova); \ + int pt_iommu_##fmt##_map_pages(struct iommu_domain *domain, \ + unsigned long iova, phys_addr_t paddr, \ + size_t pgsize, size_t pgcount, \ + int prot, gfp_t gfp, size_t *mapped); \ size_t pt_iommu_##fmt##_unmap_pages( \ struct iommu_domain *domain, unsigned long iova, \ size_t pgsize, size_t pgcount, \ @@ -142,6 +200,7 @@ struct pt_iommu_cfg { */ #define IOMMU_PT_DOMAIN_OPS(fmt) \ .iova_to_phys = &pt_iommu_##fmt##_iova_to_phys, \ + .map_pages = &pt_iommu_##fmt##_map_pages, \ .unmap_pages = &pt_iommu_##fmt##_unmap_pages /* |