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
22 * struct iommu_flush_ops - IOMMU callbacks for TLB and page table management.
24 * @tlb_flush_all: Synchronously invalidate the entire TLB context.
25 * @tlb_flush_walk: Synchronously invalidate all intermediate TLB state
26 * (sometimes referred to as the "walk cache") for a virtual
28 * @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a
29 * single page. IOMMUs that cannot batch TLB invalidation
30 * operations efficiently will typically issue them here, but
31 * others may decide to update the iommu_iotlb_gather structure
32 * and defer the invalidation until iommu_iotlb_sync() instead.
34 * Note that these can all be called in atomic context and must therefore
37 struct iommu_flush_ops {
38 void (*tlb_flush_all)(void *cookie);
39 void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule,
41 void (*tlb_add_page)(struct iommu_iotlb_gather *gather,
42 unsigned long iova, size_t granule, void *cookie);
46 * struct io_pgtable_cfg - Configuration data for a set of page tables.
48 * @quirks: A bitmap of hardware quirks that require some special
49 * action by the low-level page table allocator.
50 * @pgsize_bitmap: A bitmap of page sizes supported by this set of page
52 * @ias: Input address (iova) size, in bits.
53 * @oas: Output address (paddr) size, in bits.
54 * @coherent_walk A flag to indicate whether or not page table walks made
55 * by the IOMMU are coherent with the CPU caches.
56 * @tlb: TLB management callbacks for this set of tables.
57 * @iommu_dev: The device representing the DMA configuration for the
60 struct io_pgtable_cfg {
62 * IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in
63 * stage 1 PTEs, for hardware which insists on validating them
64 * even in non-secure state where they should normally be ignored.
66 * IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and
67 * IOMMU_NOEXEC flags and map everything with full access, for
68 * hardware which does not implement the permissions of a given
69 * format, and/or requires some format-specific default value.
71 * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
72 * to support up to 35 bits PA where the bit32, bit33 and bit34 are
73 * encoded in the bit9, bit4 and bit5 of the PTE respectively.
75 * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
76 * on unmap, for DMA domains using the flush queue mechanism for
77 * delayed invalidation.
79 * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
80 * for use in the upper half of a split address space.
82 * IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability
83 * attributes set in the TCR for a non-coherent page-table walker.
85 #define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
86 #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
87 #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
88 #define IO_PGTABLE_QUIRK_NON_STRICT BIT(4)
89 #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
90 #define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6)
92 unsigned long pgsize_bitmap;
96 const struct iommu_flush_ops *tlb;
97 struct device *iommu_dev;
99 /* Low-level data specific to the table format */
142 * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
144 * @map: Map a physically contiguous memory region.
145 * @unmap: Unmap a physically contiguous memory region.
146 * @iova_to_phys: Translate iova to physical address.
148 * These functions map directly onto the iommu_ops member functions with
151 struct io_pgtable_ops {
152 int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
153 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
154 size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
155 size_t size, struct iommu_iotlb_gather *gather);
156 phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
161 * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
163 * @fmt: The page table format.
164 * @cfg: The page table configuration. This will be modified to represent
165 * the configuration actually provided by the allocator (e.g. the
166 * pgsize_bitmap may be restricted).
167 * @cookie: An opaque token provided by the IOMMU driver and passed back to
168 * the callback routines in cfg->tlb.
170 struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
171 struct io_pgtable_cfg *cfg,
175 * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
176 * *must* ensure that the page table is no longer
177 * live, but the TLB can be dirty.
179 * @ops: The ops returned from alloc_io_pgtable_ops.
181 void free_io_pgtable_ops(struct io_pgtable_ops *ops);
185 * Internal structures for page table allocator implementations.
189 * struct io_pgtable - Internal structure describing a set of page tables.
191 * @fmt: The page table format.
192 * @cookie: An opaque token provided by the IOMMU driver and passed back to
193 * any callback routines.
194 * @cfg: A copy of the page table configuration.
195 * @ops: The page table operations in use for this set of page tables.
198 enum io_pgtable_fmt fmt;
200 struct io_pgtable_cfg cfg;
201 struct io_pgtable_ops ops;
204 #define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
206 struct io_pgtable_domain_attr {
207 unsigned long quirks;
210 static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
212 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all)
213 iop->cfg.tlb->tlb_flush_all(iop->cookie);
217 io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova,
218 size_t size, size_t granule)
220 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk)
221 iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie);
225 io_pgtable_tlb_add_page(struct io_pgtable *iop,
226 struct iommu_iotlb_gather * gather, unsigned long iova,
229 if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page)
230 iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie);
234 * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
237 * @alloc: Allocate a set of page tables described by cfg.
238 * @free: Free the page tables associated with iop.
240 struct io_pgtable_init_fns {
241 struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
242 void (*free)(struct io_pgtable *iop);
245 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
246 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
247 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
248 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
249 extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
250 extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
252 #endif /* __IO_PGTABLE_H */