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e1d3c0fd WD |
1 | /* |
2 | * CPU-agnostic ARM page table allocator. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | * | |
16 | * Copyright (C) 2014 ARM Limited | |
17 | * | |
18 | * Author: Will Deacon <will.deacon@arm.com> | |
19 | */ | |
20 | ||
21 | #define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt | |
22 | ||
2c3d273e | 23 | #include <linux/atomic.h> |
6c89928f | 24 | #include <linux/bitops.h> |
e1d3c0fd WD |
25 | #include <linux/iommu.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/sizes.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/types.h> | |
8f6aff98 | 30 | #include <linux/dma-mapping.h> |
e1d3c0fd | 31 | |
87a91b15 RM |
32 | #include <asm/barrier.h> |
33 | ||
e1d3c0fd WD |
34 | #include "io-pgtable.h" |
35 | ||
6c89928f | 36 | #define ARM_LPAE_MAX_ADDR_BITS 52 |
e1d3c0fd WD |
37 | #define ARM_LPAE_S2_MAX_CONCAT_PAGES 16 |
38 | #define ARM_LPAE_MAX_LEVELS 4 | |
39 | ||
40 | /* Struct accessors */ | |
41 | #define io_pgtable_to_data(x) \ | |
42 | container_of((x), struct arm_lpae_io_pgtable, iop) | |
43 | ||
e1d3c0fd WD |
44 | #define io_pgtable_ops_to_data(x) \ |
45 | io_pgtable_to_data(io_pgtable_ops_to_pgtable(x)) | |
46 | ||
47 | /* | |
48 | * For consistency with the architecture, we always consider | |
49 | * ARM_LPAE_MAX_LEVELS levels, with the walk starting at level n >=0 | |
50 | */ | |
51 | #define ARM_LPAE_START_LVL(d) (ARM_LPAE_MAX_LEVELS - (d)->levels) | |
52 | ||
53 | /* | |
54 | * Calculate the right shift amount to get to the portion describing level l | |
55 | * in a virtual address mapped by the pagetable in d. | |
56 | */ | |
57 | #define ARM_LPAE_LVL_SHIFT(l,d) \ | |
58 | ((((d)->levels - ((l) - ARM_LPAE_START_LVL(d) + 1)) \ | |
59 | * (d)->bits_per_level) + (d)->pg_shift) | |
60 | ||
06c610e8 RM |
61 | #define ARM_LPAE_GRANULE(d) (1UL << (d)->pg_shift) |
62 | ||
367bd978 | 63 | #define ARM_LPAE_PAGES_PER_PGD(d) \ |
06c610e8 | 64 | DIV_ROUND_UP((d)->pgd_size, ARM_LPAE_GRANULE(d)) |
e1d3c0fd WD |
65 | |
66 | /* | |
67 | * Calculate the index at level l used to map virtual address a using the | |
68 | * pagetable in d. | |
69 | */ | |
70 | #define ARM_LPAE_PGD_IDX(l,d) \ | |
71 | ((l) == ARM_LPAE_START_LVL(d) ? ilog2(ARM_LPAE_PAGES_PER_PGD(d)) : 0) | |
72 | ||
73 | #define ARM_LPAE_LVL_IDX(a,l,d) \ | |
367bd978 | 74 | (((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \ |
e1d3c0fd WD |
75 | ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1)) |
76 | ||
77 | /* Calculate the block/page mapping size at level l for pagetable in d. */ | |
78 | #define ARM_LPAE_BLOCK_SIZE(l,d) \ | |
022f4e4f | 79 | (1ULL << (ilog2(sizeof(arm_lpae_iopte)) + \ |
e1d3c0fd WD |
80 | ((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level))) |
81 | ||
82 | /* Page table bits */ | |
83 | #define ARM_LPAE_PTE_TYPE_SHIFT 0 | |
84 | #define ARM_LPAE_PTE_TYPE_MASK 0x3 | |
85 | ||
86 | #define ARM_LPAE_PTE_TYPE_BLOCK 1 | |
87 | #define ARM_LPAE_PTE_TYPE_TABLE 3 | |
88 | #define ARM_LPAE_PTE_TYPE_PAGE 3 | |
89 | ||
6c89928f RM |
90 | #define ARM_LPAE_PTE_ADDR_MASK GENMASK_ULL(47,12) |
91 | ||
c896c132 | 92 | #define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63) |
e1d3c0fd WD |
93 | #define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53) |
94 | #define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10) | |
95 | #define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8) | |
96 | #define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 8) | |
97 | #define ARM_LPAE_PTE_SH_IS (((arm_lpae_iopte)3) << 8) | |
c896c132 | 98 | #define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5) |
e1d3c0fd WD |
99 | #define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0) |
100 | ||
101 | #define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2) | |
102 | /* Ignore the contiguous bit for block splitting */ | |
103 | #define ARM_LPAE_PTE_ATTR_HI_MASK (((arm_lpae_iopte)6) << 52) | |
104 | #define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \ | |
105 | ARM_LPAE_PTE_ATTR_HI_MASK) | |
2c3d273e RM |
106 | /* Software bit for solving coherency races */ |
107 | #define ARM_LPAE_PTE_SW_SYNC (((arm_lpae_iopte)1) << 55) | |
e1d3c0fd WD |
108 | |
109 | /* Stage-1 PTE */ | |
110 | #define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6) | |
111 | #define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)2) << 6) | |
112 | #define ARM_LPAE_PTE_ATTRINDX_SHIFT 2 | |
113 | #define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11) | |
114 | ||
115 | /* Stage-2 PTE */ | |
116 | #define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6) | |
117 | #define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6) | |
118 | #define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6) | |
119 | #define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2) | |
120 | #define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2) | |
121 | #define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2) | |
122 | ||
123 | /* Register bits */ | |
124 | #define ARM_32_LPAE_TCR_EAE (1 << 31) | |
125 | #define ARM_64_LPAE_S2_TCR_RES1 (1 << 31) | |
126 | ||
63979b8d WD |
127 | #define ARM_LPAE_TCR_EPD1 (1 << 23) |
128 | ||
e1d3c0fd WD |
129 | #define ARM_LPAE_TCR_TG0_4K (0 << 14) |
130 | #define ARM_LPAE_TCR_TG0_64K (1 << 14) | |
131 | #define ARM_LPAE_TCR_TG0_16K (2 << 14) | |
132 | ||
133 | #define ARM_LPAE_TCR_SH0_SHIFT 12 | |
134 | #define ARM_LPAE_TCR_SH0_MASK 0x3 | |
135 | #define ARM_LPAE_TCR_SH_NS 0 | |
136 | #define ARM_LPAE_TCR_SH_OS 2 | |
137 | #define ARM_LPAE_TCR_SH_IS 3 | |
138 | ||
139 | #define ARM_LPAE_TCR_ORGN0_SHIFT 10 | |
140 | #define ARM_LPAE_TCR_IRGN0_SHIFT 8 | |
141 | #define ARM_LPAE_TCR_RGN_MASK 0x3 | |
142 | #define ARM_LPAE_TCR_RGN_NC 0 | |
143 | #define ARM_LPAE_TCR_RGN_WBWA 1 | |
144 | #define ARM_LPAE_TCR_RGN_WT 2 | |
145 | #define ARM_LPAE_TCR_RGN_WB 3 | |
146 | ||
147 | #define ARM_LPAE_TCR_SL0_SHIFT 6 | |
148 | #define ARM_LPAE_TCR_SL0_MASK 0x3 | |
149 | ||
150 | #define ARM_LPAE_TCR_T0SZ_SHIFT 0 | |
151 | #define ARM_LPAE_TCR_SZ_MASK 0xf | |
152 | ||
153 | #define ARM_LPAE_TCR_PS_SHIFT 16 | |
154 | #define ARM_LPAE_TCR_PS_MASK 0x7 | |
155 | ||
156 | #define ARM_LPAE_TCR_IPS_SHIFT 32 | |
157 | #define ARM_LPAE_TCR_IPS_MASK 0x7 | |
158 | ||
159 | #define ARM_LPAE_TCR_PS_32_BIT 0x0ULL | |
160 | #define ARM_LPAE_TCR_PS_36_BIT 0x1ULL | |
161 | #define ARM_LPAE_TCR_PS_40_BIT 0x2ULL | |
162 | #define ARM_LPAE_TCR_PS_42_BIT 0x3ULL | |
163 | #define ARM_LPAE_TCR_PS_44_BIT 0x4ULL | |
164 | #define ARM_LPAE_TCR_PS_48_BIT 0x5ULL | |
6c89928f | 165 | #define ARM_LPAE_TCR_PS_52_BIT 0x6ULL |
e1d3c0fd WD |
166 | |
167 | #define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3) | |
168 | #define ARM_LPAE_MAIR_ATTR_MASK 0xff | |
169 | #define ARM_LPAE_MAIR_ATTR_DEVICE 0x04 | |
170 | #define ARM_LPAE_MAIR_ATTR_NC 0x44 | |
171 | #define ARM_LPAE_MAIR_ATTR_WBRWA 0xff | |
172 | #define ARM_LPAE_MAIR_ATTR_IDX_NC 0 | |
173 | #define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1 | |
174 | #define ARM_LPAE_MAIR_ATTR_IDX_DEV 2 | |
175 | ||
176 | /* IOPTE accessors */ | |
6c89928f | 177 | #define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d)) |
e1d3c0fd WD |
178 | |
179 | #define iopte_type(pte,l) \ | |
180 | (((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK) | |
181 | ||
182 | #define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK) | |
183 | ||
184 | #define iopte_leaf(pte,l) \ | |
185 | (l == (ARM_LPAE_MAX_LEVELS - 1) ? \ | |
186 | (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_PAGE) : \ | |
187 | (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_BLOCK)) | |
188 | ||
e1d3c0fd WD |
189 | struct arm_lpae_io_pgtable { |
190 | struct io_pgtable iop; | |
191 | ||
192 | int levels; | |
193 | size_t pgd_size; | |
194 | unsigned long pg_shift; | |
195 | unsigned long bits_per_level; | |
196 | ||
197 | void *pgd; | |
198 | }; | |
199 | ||
200 | typedef u64 arm_lpae_iopte; | |
201 | ||
6c89928f RM |
202 | static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr, |
203 | struct arm_lpae_io_pgtable *data) | |
204 | { | |
205 | arm_lpae_iopte pte = paddr; | |
206 | ||
207 | /* Of the bits which overlap, either 51:48 or 15:12 are always RES0 */ | |
208 | return (pte | (pte >> (48 - 12))) & ARM_LPAE_PTE_ADDR_MASK; | |
209 | } | |
210 | ||
211 | static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte, | |
212 | struct arm_lpae_io_pgtable *data) | |
213 | { | |
78688059 | 214 | u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK; |
6c89928f RM |
215 | |
216 | if (data->pg_shift < 16) | |
217 | return paddr; | |
218 | ||
219 | /* Rotate the packed high-order bits back to the top */ | |
220 | return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4); | |
221 | } | |
222 | ||
fe4b991d WD |
223 | static bool selftest_running = false; |
224 | ||
ffcb6d16 | 225 | static dma_addr_t __arm_lpae_dma_addr(void *pages) |
f8d54961 | 226 | { |
ffcb6d16 | 227 | return (dma_addr_t)virt_to_phys(pages); |
f8d54961 RM |
228 | } |
229 | ||
230 | static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp, | |
231 | struct io_pgtable_cfg *cfg) | |
232 | { | |
233 | struct device *dev = cfg->iommu_dev; | |
4b123757 RM |
234 | int order = get_order(size); |
235 | struct page *p; | |
f8d54961 | 236 | dma_addr_t dma; |
4b123757 | 237 | void *pages; |
f8d54961 | 238 | |
4b123757 RM |
239 | VM_BUG_ON((gfp & __GFP_HIGHMEM)); |
240 | p = alloc_pages_node(dev_to_node(dev), gfp | __GFP_ZERO, order); | |
241 | if (!p) | |
f8d54961 RM |
242 | return NULL; |
243 | ||
4b123757 | 244 | pages = page_address(p); |
81b3c252 | 245 | if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA)) { |
f8d54961 RM |
246 | dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE); |
247 | if (dma_mapping_error(dev, dma)) | |
248 | goto out_free; | |
249 | /* | |
250 | * We depend on the IOMMU being able to work with any physical | |
ffcb6d16 RM |
251 | * address directly, so if the DMA layer suggests otherwise by |
252 | * translating or truncating them, that bodes very badly... | |
f8d54961 | 253 | */ |
ffcb6d16 | 254 | if (dma != virt_to_phys(pages)) |
f8d54961 RM |
255 | goto out_unmap; |
256 | } | |
257 | ||
258 | return pages; | |
259 | ||
260 | out_unmap: | |
261 | dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n"); | |
262 | dma_unmap_single(dev, dma, size, DMA_TO_DEVICE); | |
263 | out_free: | |
4b123757 | 264 | __free_pages(p, order); |
f8d54961 RM |
265 | return NULL; |
266 | } | |
267 | ||
268 | static void __arm_lpae_free_pages(void *pages, size_t size, | |
269 | struct io_pgtable_cfg *cfg) | |
270 | { | |
81b3c252 | 271 | if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA)) |
ffcb6d16 | 272 | dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages), |
f8d54961 | 273 | size, DMA_TO_DEVICE); |
4b123757 | 274 | free_pages((unsigned long)pages, get_order(size)); |
f8d54961 RM |
275 | } |
276 | ||
2c3d273e RM |
277 | static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, |
278 | struct io_pgtable_cfg *cfg) | |
279 | { | |
280 | dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep), | |
281 | sizeof(*ptep), DMA_TO_DEVICE); | |
282 | } | |
283 | ||
f8d54961 | 284 | static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte, |
87a91b15 | 285 | struct io_pgtable_cfg *cfg) |
f8d54961 | 286 | { |
f8d54961 RM |
287 | *ptep = pte; |
288 | ||
81b3c252 | 289 | if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA)) |
2c3d273e | 290 | __arm_lpae_sync_pte(ptep, cfg); |
f8d54961 RM |
291 | } |
292 | ||
193e67c0 VG |
293 | static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, |
294 | unsigned long iova, size_t size, int lvl, | |
295 | arm_lpae_iopte *ptep); | |
cf27ec93 | 296 | |
fb3a9579 RM |
297 | static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data, |
298 | phys_addr_t paddr, arm_lpae_iopte prot, | |
299 | int lvl, arm_lpae_iopte *ptep) | |
300 | { | |
301 | arm_lpae_iopte pte = prot; | |
302 | ||
303 | if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS) | |
304 | pte |= ARM_LPAE_PTE_NS; | |
305 | ||
306 | if (lvl == ARM_LPAE_MAX_LEVELS - 1) | |
307 | pte |= ARM_LPAE_PTE_TYPE_PAGE; | |
308 | else | |
309 | pte |= ARM_LPAE_PTE_TYPE_BLOCK; | |
310 | ||
311 | pte |= ARM_LPAE_PTE_AF | ARM_LPAE_PTE_SH_IS; | |
6c89928f | 312 | pte |= paddr_to_iopte(paddr, data); |
fb3a9579 RM |
313 | |
314 | __arm_lpae_set_pte(ptep, pte, &data->iop.cfg); | |
315 | } | |
316 | ||
e1d3c0fd WD |
317 | static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data, |
318 | unsigned long iova, phys_addr_t paddr, | |
319 | arm_lpae_iopte prot, int lvl, | |
320 | arm_lpae_iopte *ptep) | |
321 | { | |
fb3a9579 | 322 | arm_lpae_iopte pte = *ptep; |
e1d3c0fd | 323 | |
fb3a9579 | 324 | if (iopte_leaf(pte, lvl)) { |
cf27ec93 | 325 | /* We require an unmap first */ |
fe4b991d | 326 | WARN_ON(!selftest_running); |
e1d3c0fd | 327 | return -EEXIST; |
fb3a9579 | 328 | } else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) { |
cf27ec93 WD |
329 | /* |
330 | * We need to unmap and free the old table before | |
331 | * overwriting it with a block entry. | |
332 | */ | |
333 | arm_lpae_iopte *tblp; | |
334 | size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data); | |
335 | ||
336 | tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data); | |
337 | if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz)) | |
338 | return -EINVAL; | |
fe4b991d | 339 | } |
e1d3c0fd | 340 | |
fb3a9579 RM |
341 | __arm_lpae_init_pte(data, paddr, prot, lvl, ptep); |
342 | return 0; | |
343 | } | |
c896c132 | 344 | |
fb3a9579 RM |
345 | static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table, |
346 | arm_lpae_iopte *ptep, | |
2c3d273e | 347 | arm_lpae_iopte curr, |
fb3a9579 RM |
348 | struct io_pgtable_cfg *cfg) |
349 | { | |
2c3d273e | 350 | arm_lpae_iopte old, new; |
e1d3c0fd | 351 | |
fb3a9579 RM |
352 | new = __pa(table) | ARM_LPAE_PTE_TYPE_TABLE; |
353 | if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS) | |
354 | new |= ARM_LPAE_PTE_NSTABLE; | |
e1d3c0fd | 355 | |
77f34458 WD |
356 | /* |
357 | * Ensure the table itself is visible before its PTE can be. | |
358 | * Whilst we could get away with cmpxchg64_release below, this | |
359 | * doesn't have any ordering semantics when !CONFIG_SMP. | |
360 | */ | |
361 | dma_wmb(); | |
2c3d273e RM |
362 | |
363 | old = cmpxchg64_relaxed(ptep, curr, new); | |
364 | ||
365 | if ((cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA) || | |
366 | (old & ARM_LPAE_PTE_SW_SYNC)) | |
367 | return old; | |
368 | ||
369 | /* Even if it's not ours, there's no point waiting; just kick it */ | |
370 | __arm_lpae_sync_pte(ptep, cfg); | |
371 | if (old == curr) | |
372 | WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC); | |
373 | ||
374 | return old; | |
e1d3c0fd WD |
375 | } |
376 | ||
377 | static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova, | |
378 | phys_addr_t paddr, size_t size, arm_lpae_iopte prot, | |
379 | int lvl, arm_lpae_iopte *ptep) | |
380 | { | |
381 | arm_lpae_iopte *cptep, pte; | |
e1d3c0fd | 382 | size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data); |
2c3d273e | 383 | size_t tblsz = ARM_LPAE_GRANULE(data); |
f8d54961 | 384 | struct io_pgtable_cfg *cfg = &data->iop.cfg; |
e1d3c0fd WD |
385 | |
386 | /* Find our entry at the current level */ | |
387 | ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); | |
388 | ||
389 | /* If we can install a leaf entry at this level, then do so */ | |
f8d54961 | 390 | if (size == block_size && (size & cfg->pgsize_bitmap)) |
e1d3c0fd WD |
391 | return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep); |
392 | ||
393 | /* We can't allocate tables at the final level */ | |
394 | if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1)) | |
395 | return -EINVAL; | |
396 | ||
397 | /* Grab a pointer to the next level */ | |
2c3d273e | 398 | pte = READ_ONCE(*ptep); |
e1d3c0fd | 399 | if (!pte) { |
2c3d273e | 400 | cptep = __arm_lpae_alloc_pages(tblsz, GFP_ATOMIC, cfg); |
e1d3c0fd WD |
401 | if (!cptep) |
402 | return -ENOMEM; | |
403 | ||
2c3d273e RM |
404 | pte = arm_lpae_install_table(cptep, ptep, 0, cfg); |
405 | if (pte) | |
406 | __arm_lpae_free_pages(cptep, tblsz, cfg); | |
407 | } else if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA) && | |
408 | !(pte & ARM_LPAE_PTE_SW_SYNC)) { | |
409 | __arm_lpae_sync_pte(ptep, cfg); | |
410 | } | |
411 | ||
412 | if (pte && !iopte_leaf(pte, lvl)) { | |
e1d3c0fd | 413 | cptep = iopte_deref(pte, data); |
2c3d273e | 414 | } else if (pte) { |
ed46e66c OT |
415 | /* We require an unmap first */ |
416 | WARN_ON(!selftest_running); | |
417 | return -EEXIST; | |
e1d3c0fd WD |
418 | } |
419 | ||
420 | /* Rinse, repeat */ | |
421 | return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep); | |
422 | } | |
423 | ||
424 | static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data, | |
425 | int prot) | |
426 | { | |
427 | arm_lpae_iopte pte; | |
428 | ||
429 | if (data->iop.fmt == ARM_64_LPAE_S1 || | |
430 | data->iop.fmt == ARM_32_LPAE_S1) { | |
e7468a23 | 431 | pte = ARM_LPAE_PTE_nG; |
e1d3c0fd WD |
432 | |
433 | if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ)) | |
434 | pte |= ARM_LPAE_PTE_AP_RDONLY; | |
435 | ||
e7468a23 JG |
436 | if (!(prot & IOMMU_PRIV)) |
437 | pte |= ARM_LPAE_PTE_AP_UNPRIV; | |
438 | ||
fb948251 RM |
439 | if (prot & IOMMU_MMIO) |
440 | pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV | |
441 | << ARM_LPAE_PTE_ATTRINDX_SHIFT); | |
442 | else if (prot & IOMMU_CACHE) | |
e1d3c0fd WD |
443 | pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE |
444 | << ARM_LPAE_PTE_ATTRINDX_SHIFT); | |
445 | } else { | |
446 | pte = ARM_LPAE_PTE_HAP_FAULT; | |
447 | if (prot & IOMMU_READ) | |
448 | pte |= ARM_LPAE_PTE_HAP_READ; | |
449 | if (prot & IOMMU_WRITE) | |
450 | pte |= ARM_LPAE_PTE_HAP_WRITE; | |
fb948251 RM |
451 | if (prot & IOMMU_MMIO) |
452 | pte |= ARM_LPAE_PTE_MEMATTR_DEV; | |
453 | else if (prot & IOMMU_CACHE) | |
e1d3c0fd WD |
454 | pte |= ARM_LPAE_PTE_MEMATTR_OIWB; |
455 | else | |
456 | pte |= ARM_LPAE_PTE_MEMATTR_NC; | |
457 | } | |
458 | ||
459 | if (prot & IOMMU_NOEXEC) | |
460 | pte |= ARM_LPAE_PTE_XN; | |
461 | ||
462 | return pte; | |
463 | } | |
464 | ||
465 | static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, | |
466 | phys_addr_t paddr, size_t size, int iommu_prot) | |
467 | { | |
468 | struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); | |
469 | arm_lpae_iopte *ptep = data->pgd; | |
87a91b15 | 470 | int ret, lvl = ARM_LPAE_START_LVL(data); |
e1d3c0fd WD |
471 | arm_lpae_iopte prot; |
472 | ||
473 | /* If no access, then nothing to do */ | |
474 | if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) | |
475 | return 0; | |
476 | ||
76557391 RM |
477 | if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) || |
478 | paddr >= (1ULL << data->iop.cfg.oas))) | |
479 | return -ERANGE; | |
480 | ||
e1d3c0fd | 481 | prot = arm_lpae_prot_to_pte(data, iommu_prot); |
87a91b15 RM |
482 | ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep); |
483 | /* | |
484 | * Synchronise all PTE updates for the new mapping before there's | |
485 | * a chance for anything to kick off a table walk for the new iova. | |
486 | */ | |
487 | wmb(); | |
488 | ||
489 | return ret; | |
e1d3c0fd WD |
490 | } |
491 | ||
492 | static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl, | |
493 | arm_lpae_iopte *ptep) | |
494 | { | |
495 | arm_lpae_iopte *start, *end; | |
496 | unsigned long table_size; | |
497 | ||
e1d3c0fd WD |
498 | if (lvl == ARM_LPAE_START_LVL(data)) |
499 | table_size = data->pgd_size; | |
500 | else | |
06c610e8 | 501 | table_size = ARM_LPAE_GRANULE(data); |
e1d3c0fd WD |
502 | |
503 | start = ptep; | |
12c2ab09 WD |
504 | |
505 | /* Only leaf entries at the last level */ | |
506 | if (lvl == ARM_LPAE_MAX_LEVELS - 1) | |
507 | end = ptep; | |
508 | else | |
509 | end = (void *)ptep + table_size; | |
e1d3c0fd WD |
510 | |
511 | while (ptep != end) { | |
512 | arm_lpae_iopte pte = *ptep++; | |
513 | ||
514 | if (!pte || iopte_leaf(pte, lvl)) | |
515 | continue; | |
516 | ||
517 | __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data)); | |
518 | } | |
519 | ||
f8d54961 | 520 | __arm_lpae_free_pages(start, table_size, &data->iop.cfg); |
e1d3c0fd WD |
521 | } |
522 | ||
523 | static void arm_lpae_free_pgtable(struct io_pgtable *iop) | |
524 | { | |
525 | struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop); | |
526 | ||
527 | __arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd); | |
528 | kfree(data); | |
529 | } | |
530 | ||
193e67c0 VG |
531 | static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data, |
532 | unsigned long iova, size_t size, | |
533 | arm_lpae_iopte blk_pte, int lvl, | |
534 | arm_lpae_iopte *ptep) | |
e1d3c0fd | 535 | { |
fb3a9579 RM |
536 | struct io_pgtable_cfg *cfg = &data->iop.cfg; |
537 | arm_lpae_iopte pte, *tablep; | |
e1d3c0fd | 538 | phys_addr_t blk_paddr; |
fb3a9579 RM |
539 | size_t tablesz = ARM_LPAE_GRANULE(data); |
540 | size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data); | |
541 | int i, unmap_idx = -1; | |
542 | ||
543 | if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS)) | |
544 | return 0; | |
e1d3c0fd | 545 | |
fb3a9579 RM |
546 | tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg); |
547 | if (!tablep) | |
548 | return 0; /* Bytes unmapped */ | |
e1d3c0fd | 549 | |
fb3a9579 RM |
550 | if (size == split_sz) |
551 | unmap_idx = ARM_LPAE_LVL_IDX(iova, lvl, data); | |
e1d3c0fd | 552 | |
6c89928f | 553 | blk_paddr = iopte_to_paddr(blk_pte, data); |
fb3a9579 RM |
554 | pte = iopte_prot(blk_pte); |
555 | ||
556 | for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz) { | |
e1d3c0fd | 557 | /* Unmap! */ |
fb3a9579 | 558 | if (i == unmap_idx) |
e1d3c0fd WD |
559 | continue; |
560 | ||
fb3a9579 | 561 | __arm_lpae_init_pte(data, blk_paddr, pte, lvl, &tablep[i]); |
e1d3c0fd WD |
562 | } |
563 | ||
2c3d273e RM |
564 | pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg); |
565 | if (pte != blk_pte) { | |
566 | __arm_lpae_free_pages(tablep, tablesz, cfg); | |
567 | /* | |
568 | * We may race against someone unmapping another part of this | |
569 | * block, but anything else is invalid. We can't misinterpret | |
570 | * a page entry here since we're never at the last level. | |
571 | */ | |
572 | if (iopte_type(pte, lvl - 1) != ARM_LPAE_PTE_TYPE_TABLE) | |
573 | return 0; | |
574 | ||
575 | tablep = iopte_deref(pte, data); | |
576 | } | |
fb3a9579 RM |
577 | |
578 | if (unmap_idx < 0) | |
579 | return __arm_lpae_unmap(data, iova, size, lvl, tablep); | |
580 | ||
581 | io_pgtable_tlb_add_flush(&data->iop, iova, size, size, true); | |
e1d3c0fd WD |
582 | return size; |
583 | } | |
584 | ||
193e67c0 VG |
585 | static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, |
586 | unsigned long iova, size_t size, int lvl, | |
587 | arm_lpae_iopte *ptep) | |
e1d3c0fd WD |
588 | { |
589 | arm_lpae_iopte pte; | |
507e4c9d | 590 | struct io_pgtable *iop = &data->iop; |
e1d3c0fd | 591 | |
2eb97c78 RM |
592 | /* Something went horribly wrong and we ran out of page table */ |
593 | if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS)) | |
594 | return 0; | |
595 | ||
e1d3c0fd | 596 | ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); |
2c3d273e | 597 | pte = READ_ONCE(*ptep); |
2eb97c78 | 598 | if (WARN_ON(!pte)) |
e1d3c0fd WD |
599 | return 0; |
600 | ||
601 | /* If the size matches this level, we're in the right place */ | |
fb3a9579 | 602 | if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) { |
507e4c9d | 603 | __arm_lpae_set_pte(ptep, 0, &iop->cfg); |
e1d3c0fd WD |
604 | |
605 | if (!iopte_leaf(pte, lvl)) { | |
606 | /* Also flush any partial walks */ | |
507e4c9d RM |
607 | io_pgtable_tlb_add_flush(iop, iova, size, |
608 | ARM_LPAE_GRANULE(data), false); | |
609 | io_pgtable_tlb_sync(iop); | |
e1d3c0fd WD |
610 | ptep = iopte_deref(pte, data); |
611 | __arm_lpae_free_pgtable(data, lvl + 1, ptep); | |
612 | } else { | |
507e4c9d | 613 | io_pgtable_tlb_add_flush(iop, iova, size, size, true); |
e1d3c0fd WD |
614 | } |
615 | ||
616 | return size; | |
617 | } else if (iopte_leaf(pte, lvl)) { | |
618 | /* | |
619 | * Insert a table at the next level to map the old region, | |
620 | * minus the part we want to unmap | |
621 | */ | |
fb3a9579 RM |
622 | return arm_lpae_split_blk_unmap(data, iova, size, pte, |
623 | lvl + 1, ptep); | |
e1d3c0fd WD |
624 | } |
625 | ||
626 | /* Keep on walkin' */ | |
627 | ptep = iopte_deref(pte, data); | |
628 | return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep); | |
629 | } | |
630 | ||
193e67c0 VG |
631 | static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, |
632 | size_t size) | |
e1d3c0fd | 633 | { |
e1d3c0fd | 634 | struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); |
e1d3c0fd WD |
635 | arm_lpae_iopte *ptep = data->pgd; |
636 | int lvl = ARM_LPAE_START_LVL(data); | |
637 | ||
76557391 RM |
638 | if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias))) |
639 | return 0; | |
640 | ||
32b12449 | 641 | return __arm_lpae_unmap(data, iova, size, lvl, ptep); |
e1d3c0fd WD |
642 | } |
643 | ||
644 | static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, | |
645 | unsigned long iova) | |
646 | { | |
647 | struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); | |
648 | arm_lpae_iopte pte, *ptep = data->pgd; | |
649 | int lvl = ARM_LPAE_START_LVL(data); | |
650 | ||
651 | do { | |
652 | /* Valid IOPTE pointer? */ | |
653 | if (!ptep) | |
654 | return 0; | |
655 | ||
656 | /* Grab the IOPTE we're interested in */ | |
2c3d273e RM |
657 | ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); |
658 | pte = READ_ONCE(*ptep); | |
e1d3c0fd WD |
659 | |
660 | /* Valid entry? */ | |
661 | if (!pte) | |
662 | return 0; | |
663 | ||
664 | /* Leaf entry? */ | |
665 | if (iopte_leaf(pte,lvl)) | |
666 | goto found_translation; | |
667 | ||
668 | /* Take it to the next level */ | |
669 | ptep = iopte_deref(pte, data); | |
670 | } while (++lvl < ARM_LPAE_MAX_LEVELS); | |
671 | ||
672 | /* Ran out of page tables to walk */ | |
673 | return 0; | |
674 | ||
675 | found_translation: | |
7c6d90e2 | 676 | iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1); |
6c89928f | 677 | return iopte_to_paddr(pte, data) | iova; |
e1d3c0fd WD |
678 | } |
679 | ||
680 | static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg) | |
681 | { | |
6c89928f RM |
682 | unsigned long granule, page_sizes; |
683 | unsigned int max_addr_bits = 48; | |
e1d3c0fd WD |
684 | |
685 | /* | |
686 | * We need to restrict the supported page sizes to match the | |
687 | * translation regime for a particular granule. Aim to match | |
688 | * the CPU page size if possible, otherwise prefer smaller sizes. | |
689 | * While we're at it, restrict the block sizes to match the | |
690 | * chosen granule. | |
691 | */ | |
692 | if (cfg->pgsize_bitmap & PAGE_SIZE) | |
693 | granule = PAGE_SIZE; | |
694 | else if (cfg->pgsize_bitmap & ~PAGE_MASK) | |
695 | granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK); | |
696 | else if (cfg->pgsize_bitmap & PAGE_MASK) | |
697 | granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK); | |
698 | else | |
699 | granule = 0; | |
700 | ||
701 | switch (granule) { | |
702 | case SZ_4K: | |
6c89928f | 703 | page_sizes = (SZ_4K | SZ_2M | SZ_1G); |
e1d3c0fd WD |
704 | break; |
705 | case SZ_16K: | |
6c89928f | 706 | page_sizes = (SZ_16K | SZ_32M); |
e1d3c0fd WD |
707 | break; |
708 | case SZ_64K: | |
6c89928f RM |
709 | max_addr_bits = 52; |
710 | page_sizes = (SZ_64K | SZ_512M); | |
711 | if (cfg->oas > 48) | |
712 | page_sizes |= 1ULL << 42; /* 4TB */ | |
e1d3c0fd WD |
713 | break; |
714 | default: | |
6c89928f | 715 | page_sizes = 0; |
e1d3c0fd | 716 | } |
6c89928f RM |
717 | |
718 | cfg->pgsize_bitmap &= page_sizes; | |
719 | cfg->ias = min(cfg->ias, max_addr_bits); | |
720 | cfg->oas = min(cfg->oas, max_addr_bits); | |
e1d3c0fd WD |
721 | } |
722 | ||
723 | static struct arm_lpae_io_pgtable * | |
724 | arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg) | |
725 | { | |
726 | unsigned long va_bits, pgd_bits; | |
727 | struct arm_lpae_io_pgtable *data; | |
728 | ||
729 | arm_lpae_restrict_pgsizes(cfg); | |
730 | ||
731 | if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K))) | |
732 | return NULL; | |
733 | ||
734 | if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS) | |
735 | return NULL; | |
736 | ||
737 | if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS) | |
738 | return NULL; | |
739 | ||
ffcb6d16 RM |
740 | if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) { |
741 | dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n"); | |
742 | return NULL; | |
743 | } | |
744 | ||
e1d3c0fd WD |
745 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
746 | if (!data) | |
747 | return NULL; | |
748 | ||
749 | data->pg_shift = __ffs(cfg->pgsize_bitmap); | |
750 | data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte)); | |
751 | ||
752 | va_bits = cfg->ias - data->pg_shift; | |
753 | data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level); | |
754 | ||
755 | /* Calculate the actual size of our pgd (without concatenation) */ | |
756 | pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1)); | |
757 | data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte))); | |
758 | ||
759 | data->iop.ops = (struct io_pgtable_ops) { | |
760 | .map = arm_lpae_map, | |
761 | .unmap = arm_lpae_unmap, | |
762 | .iova_to_phys = arm_lpae_iova_to_phys, | |
763 | }; | |
764 | ||
765 | return data; | |
766 | } | |
767 | ||
768 | static struct io_pgtable * | |
769 | arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) | |
770 | { | |
771 | u64 reg; | |
3850db49 RM |
772 | struct arm_lpae_io_pgtable *data; |
773 | ||
81b3c252 | 774 | if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA)) |
3850db49 | 775 | return NULL; |
e1d3c0fd | 776 | |
3850db49 | 777 | data = arm_lpae_alloc_pgtable(cfg); |
e1d3c0fd WD |
778 | if (!data) |
779 | return NULL; | |
780 | ||
781 | /* TCR */ | |
782 | reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | | |
783 | (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | | |
784 | (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); | |
785 | ||
06c610e8 | 786 | switch (ARM_LPAE_GRANULE(data)) { |
e1d3c0fd WD |
787 | case SZ_4K: |
788 | reg |= ARM_LPAE_TCR_TG0_4K; | |
789 | break; | |
790 | case SZ_16K: | |
791 | reg |= ARM_LPAE_TCR_TG0_16K; | |
792 | break; | |
793 | case SZ_64K: | |
794 | reg |= ARM_LPAE_TCR_TG0_64K; | |
795 | break; | |
796 | } | |
797 | ||
798 | switch (cfg->oas) { | |
799 | case 32: | |
800 | reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
801 | break; | |
802 | case 36: | |
803 | reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
804 | break; | |
805 | case 40: | |
806 | reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
807 | break; | |
808 | case 42: | |
809 | reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
810 | break; | |
811 | case 44: | |
812 | reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
813 | break; | |
814 | case 48: | |
815 | reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
816 | break; | |
6c89928f RM |
817 | case 52: |
818 | reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_IPS_SHIFT); | |
819 | break; | |
e1d3c0fd WD |
820 | default: |
821 | goto out_free_data; | |
822 | } | |
823 | ||
824 | reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT; | |
63979b8d WD |
825 | |
826 | /* Disable speculative walks through TTBR1 */ | |
827 | reg |= ARM_LPAE_TCR_EPD1; | |
e1d3c0fd WD |
828 | cfg->arm_lpae_s1_cfg.tcr = reg; |
829 | ||
830 | /* MAIRs */ | |
831 | reg = (ARM_LPAE_MAIR_ATTR_NC | |
832 | << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) | | |
833 | (ARM_LPAE_MAIR_ATTR_WBRWA | |
834 | << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) | | |
835 | (ARM_LPAE_MAIR_ATTR_DEVICE | |
836 | << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)); | |
837 | ||
838 | cfg->arm_lpae_s1_cfg.mair[0] = reg; | |
839 | cfg->arm_lpae_s1_cfg.mair[1] = 0; | |
840 | ||
841 | /* Looking good; allocate a pgd */ | |
f8d54961 | 842 | data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg); |
e1d3c0fd WD |
843 | if (!data->pgd) |
844 | goto out_free_data; | |
845 | ||
87a91b15 RM |
846 | /* Ensure the empty pgd is visible before any actual TTBR write */ |
847 | wmb(); | |
e1d3c0fd WD |
848 | |
849 | /* TTBRs */ | |
850 | cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd); | |
851 | cfg->arm_lpae_s1_cfg.ttbr[1] = 0; | |
852 | return &data->iop; | |
853 | ||
854 | out_free_data: | |
855 | kfree(data); | |
856 | return NULL; | |
857 | } | |
858 | ||
859 | static struct io_pgtable * | |
860 | arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie) | |
861 | { | |
862 | u64 reg, sl; | |
3850db49 RM |
863 | struct arm_lpae_io_pgtable *data; |
864 | ||
865 | /* The NS quirk doesn't apply at stage 2 */ | |
81b3c252 | 866 | if (cfg->quirks & ~IO_PGTABLE_QUIRK_NO_DMA) |
3850db49 | 867 | return NULL; |
e1d3c0fd | 868 | |
3850db49 | 869 | data = arm_lpae_alloc_pgtable(cfg); |
e1d3c0fd WD |
870 | if (!data) |
871 | return NULL; | |
872 | ||
873 | /* | |
874 | * Concatenate PGDs at level 1 if possible in order to reduce | |
875 | * the depth of the stage-2 walk. | |
876 | */ | |
877 | if (data->levels == ARM_LPAE_MAX_LEVELS) { | |
878 | unsigned long pgd_pages; | |
879 | ||
880 | pgd_pages = data->pgd_size >> ilog2(sizeof(arm_lpae_iopte)); | |
881 | if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) { | |
882 | data->pgd_size = pgd_pages << data->pg_shift; | |
883 | data->levels--; | |
884 | } | |
885 | } | |
886 | ||
887 | /* VTCR */ | |
888 | reg = ARM_64_LPAE_S2_TCR_RES1 | | |
889 | (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | | |
890 | (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | | |
891 | (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); | |
892 | ||
893 | sl = ARM_LPAE_START_LVL(data); | |
894 | ||
06c610e8 | 895 | switch (ARM_LPAE_GRANULE(data)) { |
e1d3c0fd WD |
896 | case SZ_4K: |
897 | reg |= ARM_LPAE_TCR_TG0_4K; | |
898 | sl++; /* SL0 format is different for 4K granule size */ | |
899 | break; | |
900 | case SZ_16K: | |
901 | reg |= ARM_LPAE_TCR_TG0_16K; | |
902 | break; | |
903 | case SZ_64K: | |
904 | reg |= ARM_LPAE_TCR_TG0_64K; | |
905 | break; | |
906 | } | |
907 | ||
908 | switch (cfg->oas) { | |
909 | case 32: | |
910 | reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
911 | break; | |
912 | case 36: | |
913 | reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
914 | break; | |
915 | case 40: | |
916 | reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
917 | break; | |
918 | case 42: | |
919 | reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
920 | break; | |
921 | case 44: | |
922 | reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
923 | break; | |
924 | case 48: | |
925 | reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
926 | break; | |
6c89928f RM |
927 | case 52: |
928 | reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_PS_SHIFT); | |
929 | break; | |
e1d3c0fd WD |
930 | default: |
931 | goto out_free_data; | |
932 | } | |
933 | ||
934 | reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT; | |
935 | reg |= (~sl & ARM_LPAE_TCR_SL0_MASK) << ARM_LPAE_TCR_SL0_SHIFT; | |
936 | cfg->arm_lpae_s2_cfg.vtcr = reg; | |
937 | ||
938 | /* Allocate pgd pages */ | |
f8d54961 | 939 | data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg); |
e1d3c0fd WD |
940 | if (!data->pgd) |
941 | goto out_free_data; | |
942 | ||
87a91b15 RM |
943 | /* Ensure the empty pgd is visible before any actual TTBR write */ |
944 | wmb(); | |
e1d3c0fd WD |
945 | |
946 | /* VTTBR */ | |
947 | cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd); | |
948 | return &data->iop; | |
949 | ||
950 | out_free_data: | |
951 | kfree(data); | |
952 | return NULL; | |
953 | } | |
954 | ||
955 | static struct io_pgtable * | |
956 | arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) | |
957 | { | |
958 | struct io_pgtable *iop; | |
959 | ||
960 | if (cfg->ias > 32 || cfg->oas > 40) | |
961 | return NULL; | |
962 | ||
963 | cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G); | |
964 | iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie); | |
965 | if (iop) { | |
966 | cfg->arm_lpae_s1_cfg.tcr |= ARM_32_LPAE_TCR_EAE; | |
967 | cfg->arm_lpae_s1_cfg.tcr &= 0xffffffff; | |
968 | } | |
969 | ||
970 | return iop; | |
971 | } | |
972 | ||
973 | static struct io_pgtable * | |
974 | arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie) | |
975 | { | |
976 | struct io_pgtable *iop; | |
977 | ||
978 | if (cfg->ias > 40 || cfg->oas > 40) | |
979 | return NULL; | |
980 | ||
981 | cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G); | |
982 | iop = arm_64_lpae_alloc_pgtable_s2(cfg, cookie); | |
983 | if (iop) | |
984 | cfg->arm_lpae_s2_cfg.vtcr &= 0xffffffff; | |
985 | ||
986 | return iop; | |
987 | } | |
988 | ||
989 | struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = { | |
990 | .alloc = arm_64_lpae_alloc_pgtable_s1, | |
991 | .free = arm_lpae_free_pgtable, | |
992 | }; | |
993 | ||
994 | struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = { | |
995 | .alloc = arm_64_lpae_alloc_pgtable_s2, | |
996 | .free = arm_lpae_free_pgtable, | |
997 | }; | |
998 | ||
999 | struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = { | |
1000 | .alloc = arm_32_lpae_alloc_pgtable_s1, | |
1001 | .free = arm_lpae_free_pgtable, | |
1002 | }; | |
1003 | ||
1004 | struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = { | |
1005 | .alloc = arm_32_lpae_alloc_pgtable_s2, | |
1006 | .free = arm_lpae_free_pgtable, | |
1007 | }; | |
fe4b991d WD |
1008 | |
1009 | #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST | |
1010 | ||
1011 | static struct io_pgtable_cfg *cfg_cookie; | |
1012 | ||
1013 | static void dummy_tlb_flush_all(void *cookie) | |
1014 | { | |
1015 | WARN_ON(cookie != cfg_cookie); | |
1016 | } | |
1017 | ||
06c610e8 RM |
1018 | static void dummy_tlb_add_flush(unsigned long iova, size_t size, |
1019 | size_t granule, bool leaf, void *cookie) | |
fe4b991d WD |
1020 | { |
1021 | WARN_ON(cookie != cfg_cookie); | |
1022 | WARN_ON(!(size & cfg_cookie->pgsize_bitmap)); | |
1023 | } | |
1024 | ||
1025 | static void dummy_tlb_sync(void *cookie) | |
1026 | { | |
1027 | WARN_ON(cookie != cfg_cookie); | |
1028 | } | |
1029 | ||
dfed5f01 | 1030 | static const struct iommu_gather_ops dummy_tlb_ops __initconst = { |
fe4b991d WD |
1031 | .tlb_flush_all = dummy_tlb_flush_all, |
1032 | .tlb_add_flush = dummy_tlb_add_flush, | |
1033 | .tlb_sync = dummy_tlb_sync, | |
fe4b991d WD |
1034 | }; |
1035 | ||
1036 | static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops) | |
1037 | { | |
1038 | struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); | |
1039 | struct io_pgtable_cfg *cfg = &data->iop.cfg; | |
1040 | ||
1041 | pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n", | |
1042 | cfg->pgsize_bitmap, cfg->ias); | |
1043 | pr_err("data: %d levels, 0x%zx pgd_size, %lu pg_shift, %lu bits_per_level, pgd @ %p\n", | |
1044 | data->levels, data->pgd_size, data->pg_shift, | |
1045 | data->bits_per_level, data->pgd); | |
1046 | } | |
1047 | ||
1048 | #define __FAIL(ops, i) ({ \ | |
1049 | WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \ | |
1050 | arm_lpae_dump_ops(ops); \ | |
1051 | selftest_running = false; \ | |
1052 | -EFAULT; \ | |
1053 | }) | |
1054 | ||
1055 | static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg) | |
1056 | { | |
1057 | static const enum io_pgtable_fmt fmts[] = { | |
1058 | ARM_64_LPAE_S1, | |
1059 | ARM_64_LPAE_S2, | |
1060 | }; | |
1061 | ||
1062 | int i, j; | |
1063 | unsigned long iova; | |
1064 | size_t size; | |
1065 | struct io_pgtable_ops *ops; | |
1066 | ||
1067 | selftest_running = true; | |
1068 | ||
1069 | for (i = 0; i < ARRAY_SIZE(fmts); ++i) { | |
1070 | cfg_cookie = cfg; | |
1071 | ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg); | |
1072 | if (!ops) { | |
1073 | pr_err("selftest: failed to allocate io pgtable ops\n"); | |
1074 | return -ENOMEM; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Initial sanity checks. | |
1079 | * Empty page tables shouldn't provide any translations. | |
1080 | */ | |
1081 | if (ops->iova_to_phys(ops, 42)) | |
1082 | return __FAIL(ops, i); | |
1083 | ||
1084 | if (ops->iova_to_phys(ops, SZ_1G + 42)) | |
1085 | return __FAIL(ops, i); | |
1086 | ||
1087 | if (ops->iova_to_phys(ops, SZ_2G + 42)) | |
1088 | return __FAIL(ops, i); | |
1089 | ||
1090 | /* | |
1091 | * Distinct mappings of different granule sizes. | |
1092 | */ | |
1093 | iova = 0; | |
4ae8a5c5 | 1094 | for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) { |
fe4b991d WD |
1095 | size = 1UL << j; |
1096 | ||
1097 | if (ops->map(ops, iova, iova, size, IOMMU_READ | | |
1098 | IOMMU_WRITE | | |
1099 | IOMMU_NOEXEC | | |
1100 | IOMMU_CACHE)) | |
1101 | return __FAIL(ops, i); | |
1102 | ||
1103 | /* Overlapping mappings */ | |
1104 | if (!ops->map(ops, iova, iova + size, size, | |
1105 | IOMMU_READ | IOMMU_NOEXEC)) | |
1106 | return __FAIL(ops, i); | |
1107 | ||
1108 | if (ops->iova_to_phys(ops, iova + 42) != (iova + 42)) | |
1109 | return __FAIL(ops, i); | |
1110 | ||
1111 | iova += SZ_1G; | |
fe4b991d WD |
1112 | } |
1113 | ||
1114 | /* Partial unmap */ | |
1115 | size = 1UL << __ffs(cfg->pgsize_bitmap); | |
1116 | if (ops->unmap(ops, SZ_1G + size, size) != size) | |
1117 | return __FAIL(ops, i); | |
1118 | ||
1119 | /* Remap of partial unmap */ | |
1120 | if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ)) | |
1121 | return __FAIL(ops, i); | |
1122 | ||
1123 | if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42)) | |
1124 | return __FAIL(ops, i); | |
1125 | ||
1126 | /* Full unmap */ | |
1127 | iova = 0; | |
f793b13e | 1128 | for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) { |
fe4b991d WD |
1129 | size = 1UL << j; |
1130 | ||
1131 | if (ops->unmap(ops, iova, size) != size) | |
1132 | return __FAIL(ops, i); | |
1133 | ||
1134 | if (ops->iova_to_phys(ops, iova + 42)) | |
1135 | return __FAIL(ops, i); | |
1136 | ||
1137 | /* Remap full block */ | |
1138 | if (ops->map(ops, iova, iova, size, IOMMU_WRITE)) | |
1139 | return __FAIL(ops, i); | |
1140 | ||
1141 | if (ops->iova_to_phys(ops, iova + 42) != (iova + 42)) | |
1142 | return __FAIL(ops, i); | |
1143 | ||
1144 | iova += SZ_1G; | |
fe4b991d WD |
1145 | } |
1146 | ||
1147 | free_io_pgtable_ops(ops); | |
1148 | } | |
1149 | ||
1150 | selftest_running = false; | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static int __init arm_lpae_do_selftests(void) | |
1155 | { | |
1156 | static const unsigned long pgsize[] = { | |
1157 | SZ_4K | SZ_2M | SZ_1G, | |
1158 | SZ_16K | SZ_32M, | |
1159 | SZ_64K | SZ_512M, | |
1160 | }; | |
1161 | ||
1162 | static const unsigned int ias[] = { | |
1163 | 32, 36, 40, 42, 44, 48, | |
1164 | }; | |
1165 | ||
1166 | int i, j, pass = 0, fail = 0; | |
1167 | struct io_pgtable_cfg cfg = { | |
1168 | .tlb = &dummy_tlb_ops, | |
1169 | .oas = 48, | |
81b3c252 | 1170 | .quirks = IO_PGTABLE_QUIRK_NO_DMA, |
fe4b991d WD |
1171 | }; |
1172 | ||
1173 | for (i = 0; i < ARRAY_SIZE(pgsize); ++i) { | |
1174 | for (j = 0; j < ARRAY_SIZE(ias); ++j) { | |
1175 | cfg.pgsize_bitmap = pgsize[i]; | |
1176 | cfg.ias = ias[j]; | |
1177 | pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n", | |
1178 | pgsize[i], ias[j]); | |
1179 | if (arm_lpae_run_tests(&cfg)) | |
1180 | fail++; | |
1181 | else | |
1182 | pass++; | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail); | |
1187 | return fail ? -EFAULT : 0; | |
1188 | } | |
1189 | subsys_initcall(arm_lpae_do_selftests); | |
1190 | #endif |