1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/bitops.h>
6 #include <linux/iommu.h>
9 * Public API for use by IOMMU drivers
23 * struct iommu_flush_ops - IOMMU callbacks for TLB and page table management.
25 * @tlb_flush_all: Synchronously invalidate the entire TLB context.
26 * @tlb_flush_walk: Synchronously invalidate all intermediate TLB state
27 * (sometimes referred to as the "walk cache") for a virtual
29 * @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a
30 * single page. IOMMUs that cannot batch TLB invalidation
31 * operations efficiently will typically issue them here, but
32 * others may decide to update the iommu_iotlb_gather structure
33 * and defer the invalidation until iommu_iotlb_sync() instead.
35 * Note that these can all be called in atomic context and must therefore
38 struct iommu_flush_ops {
39 void (*tlb_flush_all)(void *cookie);
40 void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule,
42 void (*tlb_add_page)(struct iommu_iotlb_gather *gather,
43 unsigned long iova, size_t granule, void *cookie);
47 * struct io_pgtable_cfg - Configuration data for a set of page tables.
49 * @quirks: A bitmap of hardware quirks that require some special
50 * action by the low-level page table allocator.
51 * @pgsize_bitmap: A bitmap of page sizes supported by this set of page
53 * @ias: Input address (iova) size, in bits.
54 * @oas: Output address (paddr) size, in bits.
55 * @coherent_walk A flag to indicate whether or not page table walks made
56 * by the IOMMU are coherent with the CPU caches.
57 * @tlb: TLB management callbacks for this set of tables.
58 * @iommu_dev: The device representing the DMA configuration for the
61 struct io_pgtable_cfg {
63 * IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in
64 * stage 1 PTEs, for hardware which insists on validating them
65 * even in non-secure state where they should normally be ignored.
67 * IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and
68 * IOMMU_NOEXEC flags and map everything with full access, for
69 * hardware which does not implement the permissions of a given
70 * format, and/or requires some format-specific default value.
72 * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
73 * to support up to 35 bits PA where the bit32, bit33 and bit34 are
74 * encoded in the bit9, bit4 and bit5 of the PTE respectively.
76 * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
77 * on unmap, for DMA domains using the flush queue mechanism for
78 * delayed invalidation.
80 * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
81 * for use in the upper half of a split address space.
83 * IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability
84 * attributes set in the TCR for a non-coherent page-table walker.
86 #define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
87 #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
88 #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
89 #define IO_PGTABLE_QUIRK_NON_STRICT BIT(4)
90 #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
91 #define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6)
93 unsigned long pgsize_bitmap;
97 const struct iommu_flush_ops *tlb;
98 struct device *iommu_dev;
100 /* Low-level data specific to the table format */
143 * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
145 * @map: Map a physically contiguous memory region.
146 * @unmap: Unmap a physically contiguous memory region.
147 * @iova_to_phys: Translate iova to physical address.
149 * These functions map directly onto the iommu_ops member functions with
152 struct io_pgtable_ops {
153 int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
154 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
155 size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
156 size_t size, struct iommu_iotlb_gather *gather);
157 phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
162 * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
164 * @fmt: The page table format.
165 * @cfg: The page table configuration. This will be modified to represent
166 * the configuration actually provided by the allocator (e.g. the
167 * pgsize_bitmap may be restricted).
168 * @cookie: An opaque token provided by the IOMMU driver and passed back to
169 * the callback routines in cfg->tlb.
171 struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
172 struct io_pgtable_cfg *cfg,
176 * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
177 * *must* ensure that the page table is no longer
178 * live, but the TLB can be dirty.
180 * @ops: The ops returned from alloc_io_pgtable_ops.
182 void free_io_pgtable_ops(struct io_pgtable_ops *ops);
186 * Internal structures for page table allocator implementations.
190 * struct io_pgtable - Internal structure describing a set of page tables.
192 * @fmt: The page table format.
193 * @cookie: An opaque token provided by the IOMMU driver and passed back to
194 * any callback routines.
195 * @cfg: A copy of the page table configuration.
196 * @ops: The page table operations in use for this set of page tables.
199 enum io_pgtable_fmt fmt;
201 struct io_pgtable_cfg cfg;
202 struct io_pgtable_ops ops;
205 #define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
207 static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
209 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all)
210 iop->cfg.tlb->tlb_flush_all(iop->cookie);
214 io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova,
215 size_t size, size_t granule)
217 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk)
218 iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie);
222 io_pgtable_tlb_add_page(struct io_pgtable *iop,
223 struct iommu_iotlb_gather * gather, unsigned long iova,
226 if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page)
227 iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie);
231 * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
234 * @alloc: Allocate a set of page tables described by cfg.
235 * @free: Free the page tables associated with iop.
237 struct io_pgtable_init_fns {
238 struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
239 void (*free)(struct io_pgtable *iop);
242 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
243 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
244 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
245 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
246 extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
247 extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
248 extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns;
250 #endif /* __IO_PGTABLE_H */