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drm: add modifiers for MediaTek tiled formats
[drm/drm-misc.git] / drivers / iommu / io-pgtable-arm.c
blob6b9bb58a414fb578788a50b4f841e3d784db3599
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * CPU-agnostic ARM page table allocator.
4 *
5 * Copyright (C) 2014 ARM Limited
6 *
7 * Author: Will Deacon <will.deacon@arm.com>
8 */
9
10 #define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
11
12 #include <linux/atomic.h>
13 #include <linux/bitops.h>
14 #include <linux/io-pgtable.h>
15 #include <linux/kernel.h>
16 #include <linux/sizes.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
19 #include <linux/dma-mapping.h>
20
21 #include <asm/barrier.h>
22
23 #include "io-pgtable-arm.h"
24 #include "iommu-pages.h"
25
26 #define ARM_LPAE_MAX_ADDR_BITS 52
27 #define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
28 #define ARM_LPAE_MAX_LEVELS 4
29
30 /* Struct accessors */
31 #define io_pgtable_to_data(x) \
32 container_of((x), struct arm_lpae_io_pgtable, iop)
33
34 #define io_pgtable_ops_to_data(x) \
35 io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
36
37 /*
38 * Calculate the right shift amount to get to the portion describing level l
39 * in a virtual address mapped by the pagetable in d.
40 */
41 #define ARM_LPAE_LVL_SHIFT(l,d) \
42 (((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level) + \
43 ilog2(sizeof(arm_lpae_iopte)))
44
45 #define ARM_LPAE_GRANULE(d) \
46 (sizeof(arm_lpae_iopte) << (d)->bits_per_level)
47 #define ARM_LPAE_PGD_SIZE(d) \
48 (sizeof(arm_lpae_iopte) << (d)->pgd_bits)
49
50 #define ARM_LPAE_PTES_PER_TABLE(d) \
51 (ARM_LPAE_GRANULE(d) >> ilog2(sizeof(arm_lpae_iopte)))
52
53 /*
54 * Calculate the index at level l used to map virtual address a using the
55 * pagetable in d.
56 */
57 #define ARM_LPAE_PGD_IDX(l,d) \
58 ((l) == (d)->start_level ? (d)->pgd_bits - (d)->bits_per_level : 0)
59
60 #define ARM_LPAE_LVL_IDX(a,l,d) \
61 (((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
62 ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
63
64 /* Calculate the block/page mapping size at level l for pagetable in d. */
65 #define ARM_LPAE_BLOCK_SIZE(l,d) (1ULL << ARM_LPAE_LVL_SHIFT(l,d))
66
67 /* Page table bits */
68 #define ARM_LPAE_PTE_TYPE_SHIFT 0
69 #define ARM_LPAE_PTE_TYPE_MASK 0x3
70
71 #define ARM_LPAE_PTE_TYPE_BLOCK 1
72 #define ARM_LPAE_PTE_TYPE_TABLE 3
73 #define ARM_LPAE_PTE_TYPE_PAGE 3
74
75 #define ARM_LPAE_PTE_ADDR_MASK GENMASK_ULL(47,12)
76
77 #define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
78 #define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53)
79 #define ARM_LPAE_PTE_DBM (((arm_lpae_iopte)1) << 51)
80 #define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10)
81 #define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8)
82 #define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 8)
83 #define ARM_LPAE_PTE_SH_IS (((arm_lpae_iopte)3) << 8)
84 #define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5)
85 #define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0)
86
87 #define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2)
88 /* Ignore the contiguous bit for block splitting */
89 #define ARM_LPAE_PTE_ATTR_HI_MASK (ARM_LPAE_PTE_XN | ARM_LPAE_PTE_DBM)
90 #define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \
91 ARM_LPAE_PTE_ATTR_HI_MASK)
92 /* Software bit for solving coherency races */
93 #define ARM_LPAE_PTE_SW_SYNC (((arm_lpae_iopte)1) << 55)
94
95 /* Stage-1 PTE */
96 #define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6)
97 #define ARM_LPAE_PTE_AP_RDONLY_BIT 7
98 #define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)1) << \
99 ARM_LPAE_PTE_AP_RDONLY_BIT)
100 #define ARM_LPAE_PTE_AP_WR_CLEAN_MASK (ARM_LPAE_PTE_AP_RDONLY | \
101 ARM_LPAE_PTE_DBM)
102 #define ARM_LPAE_PTE_ATTRINDX_SHIFT 2
103 #define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11)
104
105 /* Stage-2 PTE */
106 #define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6)
107 #define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6)
108 #define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6)
109 /*
110 * For !FWB these code to:
111 * 1111 = Normal outer write back cachable / Inner Write Back Cachable
112 * Permit S1 to override
113 * 0101 = Normal Non-cachable / Inner Non-cachable
114 * 0001 = Device / Device-nGnRE
115 * For S2FWB these code:
116 * 0110 Force Normal Write Back
117 * 0101 Normal* is forced Normal-NC, Device unchanged
118 * 0001 Force Device-nGnRE
119 */
120 #define ARM_LPAE_PTE_MEMATTR_FWB_WB (((arm_lpae_iopte)0x6) << 2)
121 #define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2)
122 #define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2)
123 #define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2)
124
125 /* Register bits */
126 #define ARM_LPAE_VTCR_SL0_MASK 0x3
127
128 #define ARM_LPAE_TCR_T0SZ_SHIFT 0
129
130 #define ARM_LPAE_VTCR_PS_SHIFT 16
131 #define ARM_LPAE_VTCR_PS_MASK 0x7
132
133 #define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3)
134 #define ARM_LPAE_MAIR_ATTR_MASK 0xff
135 #define ARM_LPAE_MAIR_ATTR_DEVICE 0x04
136 #define ARM_LPAE_MAIR_ATTR_NC 0x44
137 #define ARM_LPAE_MAIR_ATTR_INC_OWBRWA 0xf4
138 #define ARM_LPAE_MAIR_ATTR_WBRWA 0xff
139 #define ARM_LPAE_MAIR_ATTR_IDX_NC 0
140 #define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1
141 #define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
142 #define ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE 3
143
144 #define ARM_MALI_LPAE_TTBR_ADRMODE_TABLE (3u << 0)
145 #define ARM_MALI_LPAE_TTBR_READ_INNER BIT(2)
146 #define ARM_MALI_LPAE_TTBR_SHARE_OUTER BIT(4)
147
148 #define ARM_MALI_LPAE_MEMATTR_IMP_DEF 0x88ULL
149 #define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
150
151 /* IOPTE accessors */
152 #define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
153
154 #define iopte_type(pte) \
155 (((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
156
157 #define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
158
159 #define iopte_writeable_dirty(pte) \
160 (((pte) & ARM_LPAE_PTE_AP_WR_CLEAN_MASK) == ARM_LPAE_PTE_DBM)
161
162 #define iopte_set_writeable_clean(ptep) \
163 set_bit(ARM_LPAE_PTE_AP_RDONLY_BIT, (unsigned long *)(ptep))
164
165 struct arm_lpae_io_pgtable {
166 struct io_pgtable iop;
167
168 int pgd_bits;
169 int start_level;
170 int bits_per_level;
171
172 void *pgd;
173 };
174
175 typedef u64 arm_lpae_iopte;
176
177 static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl,
178 enum io_pgtable_fmt fmt)
179 {
180 if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE)
181 return iopte_type(pte) == ARM_LPAE_PTE_TYPE_PAGE;
182
183 return iopte_type(pte) == ARM_LPAE_PTE_TYPE_BLOCK;
184 }
185
186 static inline bool iopte_table(arm_lpae_iopte pte, int lvl)
187 {
188 if (lvl == (ARM_LPAE_MAX_LEVELS - 1))
189 return false;
190 return iopte_type(pte) == ARM_LPAE_PTE_TYPE_TABLE;
191 }
192
193 static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
194 struct arm_lpae_io_pgtable *data)
195 {
196 arm_lpae_iopte pte = paddr;
197
198 /* Of the bits which overlap, either 51:48 or 15:12 are always RES0 */
199 return (pte | (pte >> (48 - 12))) & ARM_LPAE_PTE_ADDR_MASK;
200 }
201
202 static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
203 struct arm_lpae_io_pgtable *data)
204 {
205 u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
206
207 if (ARM_LPAE_GRANULE(data) < SZ_64K)
208 return paddr;
209
210 /* Rotate the packed high-order bits back to the top */
211 return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4);
212 }
213
214 /*
215 * Convert an index returned by ARM_LPAE_PGD_IDX(), which can point into
216 * a concatenated PGD, into the maximum number of entries that can be
217 * mapped in the same table page.
218 */
219 static inline int arm_lpae_max_entries(int i, struct arm_lpae_io_pgtable *data)
220 {
221 int ptes_per_table = ARM_LPAE_PTES_PER_TABLE(data);
222
223 return ptes_per_table - (i & (ptes_per_table - 1));
224 }
225
226 static bool selftest_running = false;
227
228 static dma_addr_t __arm_lpae_dma_addr(void *pages)
229 {
230 return (dma_addr_t)virt_to_phys(pages);
231 }
232
233 static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
234 struct io_pgtable_cfg *cfg,
235 void *cookie)
236 {
237 struct device *dev = cfg->iommu_dev;
238 int order = get_order(size);
239 dma_addr_t dma;
240 void *pages;
241
242 VM_BUG_ON((gfp & __GFP_HIGHMEM));
243
244 if (cfg->alloc)
245 pages = cfg->alloc(cookie, size, gfp);
246 else
247 pages = iommu_alloc_pages_node(dev_to_node(dev), gfp, order);
248
249 if (!pages)
250 return NULL;
251
252 if (!cfg->coherent_walk) {
253 dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
254 if (dma_mapping_error(dev, dma))
255 goto out_free;
256 /*
257 * We depend on the IOMMU being able to work with any physical
258 * address directly, so if the DMA layer suggests otherwise by
259 * translating or truncating them, that bodes very badly...
260 */
261 if (dma != virt_to_phys(pages))
262 goto out_unmap;
263 }
264
265 return pages;
266
267 out_unmap:
268 dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
269 dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
270
271 out_free:
272 if (cfg->free)
273 cfg->free(cookie, pages, size);
274 else
275 iommu_free_pages(pages, order);
276
277 return NULL;
278 }
279
280 static void __arm_lpae_free_pages(void *pages, size_t size,
281 struct io_pgtable_cfg *cfg,
282 void *cookie)
283 {
284 if (!cfg->coherent_walk)
285 dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
286 size, DMA_TO_DEVICE);
287
288 if (cfg->free)
289 cfg->free(cookie, pages, size);
290 else
291 iommu_free_pages(pages, get_order(size));
292 }
293
294 static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, int num_entries,
295 struct io_pgtable_cfg *cfg)
296 {
297 dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
298 sizeof(*ptep) * num_entries, DMA_TO_DEVICE);
299 }
300
301 static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg, int num_entries)
302 {
303 for (int i = 0; i < num_entries; i++)
304 ptep[i] = 0;
305
306 if (!cfg->coherent_walk && num_entries)
307 __arm_lpae_sync_pte(ptep, num_entries, cfg);
308 }
309
310 static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
311 struct iommu_iotlb_gather *gather,
312 unsigned long iova, size_t size, size_t pgcount,
313 int lvl, arm_lpae_iopte *ptep);
314
315 static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
316 phys_addr_t paddr, arm_lpae_iopte prot,
317 int lvl, int num_entries, arm_lpae_iopte *ptep)
318 {
319 arm_lpae_iopte pte = prot;
320 struct io_pgtable_cfg *cfg = &data->iop.cfg;
321 size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
322 int i;
323
324 if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1)
325 pte |= ARM_LPAE_PTE_TYPE_PAGE;
326 else
327 pte |= ARM_LPAE_PTE_TYPE_BLOCK;
328
329 for (i = 0; i < num_entries; i++)
330 ptep[i] = pte | paddr_to_iopte(paddr + i * sz, data);
331
332 if (!cfg->coherent_walk)
333 __arm_lpae_sync_pte(ptep, num_entries, cfg);
334 }
335
336 static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
337 unsigned long iova, phys_addr_t paddr,
338 arm_lpae_iopte prot, int lvl, int num_entries,
339 arm_lpae_iopte *ptep)
340 {
341 int i;
342
343 for (i = 0; i < num_entries; i++)
344 if (iopte_leaf(ptep[i], lvl, data->iop.fmt)) {
345 /* We require an unmap first */
346 WARN_ON(!selftest_running);
347 return -EEXIST;
348 } else if (iopte_type(ptep[i]) == ARM_LPAE_PTE_TYPE_TABLE) {
349 /*
350 * We need to unmap and free the old table before
351 * overwriting it with a block entry.
352 */
353 arm_lpae_iopte *tblp;
354 size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
355
356 tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
357 if (__arm_lpae_unmap(data, NULL, iova + i * sz, sz, 1,
358 lvl, tblp) != sz) {
359 WARN_ON(1);
360 return -EINVAL;
361 }
362 }
363
364 __arm_lpae_init_pte(data, paddr, prot, lvl, num_entries, ptep);
365 return 0;
366 }
367
368 static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
369 arm_lpae_iopte *ptep,
370 arm_lpae_iopte curr,
371 struct arm_lpae_io_pgtable *data)
372 {
373 arm_lpae_iopte old, new;
374 struct io_pgtable_cfg *cfg = &data->iop.cfg;
375
376 new = paddr_to_iopte(__pa(table), data) | ARM_LPAE_PTE_TYPE_TABLE;
377 if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
378 new |= ARM_LPAE_PTE_NSTABLE;
379
380 /*
381 * Ensure the table itself is visible before its PTE can be.
382 * Whilst we could get away with cmpxchg64_release below, this
383 * doesn't have any ordering semantics when !CONFIG_SMP.
384 */
385 dma_wmb();
386
387 old = cmpxchg64_relaxed(ptep, curr, new);
388
389 if (cfg->coherent_walk || (old & ARM_LPAE_PTE_SW_SYNC))
390 return old;
391
392 /* Even if it's not ours, there's no point waiting; just kick it */
393 __arm_lpae_sync_pte(ptep, 1, cfg);
394 if (old == curr)
395 WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
396
397 return old;
398 }
399
400 static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
401 phys_addr_t paddr, size_t size, size_t pgcount,
402 arm_lpae_iopte prot, int lvl, arm_lpae_iopte *ptep,
403 gfp_t gfp, size_t *mapped)
404 {
405 arm_lpae_iopte *cptep, pte;
406 size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
407 size_t tblsz = ARM_LPAE_GRANULE(data);
408 struct io_pgtable_cfg *cfg = &data->iop.cfg;
409 int ret = 0, num_entries, max_entries, map_idx_start;
410
411 /* Find our entry at the current level */
412 map_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
413 ptep += map_idx_start;
414
415 /* If we can install a leaf entry at this level, then do so */
416 if (size == block_size) {
417 max_entries = arm_lpae_max_entries(map_idx_start, data);
418 num_entries = min_t(int, pgcount, max_entries);
419 ret = arm_lpae_init_pte(data, iova, paddr, prot, lvl, num_entries, ptep);
420 if (!ret)
421 *mapped += num_entries * size;
422
423 return ret;
424 }
425
426 /* We can't allocate tables at the final level */
427 if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
428 return -EINVAL;
429
430 /* Grab a pointer to the next level */
431 pte = READ_ONCE(*ptep);
432 if (!pte) {
433 cptep = __arm_lpae_alloc_pages(tblsz, gfp, cfg, data->iop.cookie);
434 if (!cptep)
435 return -ENOMEM;
436
437 pte = arm_lpae_install_table(cptep, ptep, 0, data);
438 if (pte)
439 __arm_lpae_free_pages(cptep, tblsz, cfg, data->iop.cookie);
440 } else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
441 __arm_lpae_sync_pte(ptep, 1, cfg);
442 }
443
444 if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) {
445 cptep = iopte_deref(pte, data);
446 } else if (pte) {
447 /* We require an unmap first */
448 WARN_ON(!selftest_running);
449 return -EEXIST;
450 }
451
452 /* Rinse, repeat */
453 return __arm_lpae_map(data, iova, paddr, size, pgcount, prot, lvl + 1,
454 cptep, gfp, mapped);
455 }
456
457 static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
458 int prot)
459 {
460 arm_lpae_iopte pte;
461
462 if (data->iop.fmt == ARM_64_LPAE_S1 ||
463 data->iop.fmt == ARM_32_LPAE_S1) {
464 pte = ARM_LPAE_PTE_nG;
465 if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
466 pte |= ARM_LPAE_PTE_AP_RDONLY;
467 else if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_HD)
468 pte |= ARM_LPAE_PTE_DBM;
469 if (!(prot & IOMMU_PRIV))
470 pte |= ARM_LPAE_PTE_AP_UNPRIV;
471 } else {
472 pte = ARM_LPAE_PTE_HAP_FAULT;
473 if (prot & IOMMU_READ)
474 pte |= ARM_LPAE_PTE_HAP_READ;
475 if (prot & IOMMU_WRITE)
476 pte |= ARM_LPAE_PTE_HAP_WRITE;
477 }
478
479 /*
480 * Note that this logic is structured to accommodate Mali LPAE
481 * having stage-1-like attributes but stage-2-like permissions.
482 */
483 if (data->iop.fmt == ARM_64_LPAE_S2 ||
484 data->iop.fmt == ARM_32_LPAE_S2) {
485 if (prot & IOMMU_MMIO) {
486 pte |= ARM_LPAE_PTE_MEMATTR_DEV;
487 } else if (prot & IOMMU_CACHE) {
488 if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_S2FWB)
489 pte |= ARM_LPAE_PTE_MEMATTR_FWB_WB;
490 else
491 pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
492 } else {
493 pte |= ARM_LPAE_PTE_MEMATTR_NC;
494 }
495 } else {
496 if (prot & IOMMU_MMIO)
497 pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
498 << ARM_LPAE_PTE_ATTRINDX_SHIFT);
499 else if (prot & IOMMU_CACHE)
500 pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
501 << ARM_LPAE_PTE_ATTRINDX_SHIFT);
502 }
503
504 /*
505 * Also Mali has its own notions of shareability wherein its Inner
506 * domain covers the cores within the GPU, and its Outer domain is
507 * "outside the GPU" (i.e. either the Inner or System domain in CPU
508 * terms, depending on coherency).
509 */
510 if (prot & IOMMU_CACHE && data->iop.fmt != ARM_MALI_LPAE)
511 pte |= ARM_LPAE_PTE_SH_IS;
512 else
513 pte |= ARM_LPAE_PTE_SH_OS;
514
515 if (prot & IOMMU_NOEXEC)
516 pte |= ARM_LPAE_PTE_XN;
517
518 if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
519 pte |= ARM_LPAE_PTE_NS;
520
521 if (data->iop.fmt != ARM_MALI_LPAE)
522 pte |= ARM_LPAE_PTE_AF;
523
524 return pte;
525 }
526
527 static int arm_lpae_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
528 phys_addr_t paddr, size_t pgsize, size_t pgcount,
529 int iommu_prot, gfp_t gfp, size_t *mapped)
530 {
531 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
532 struct io_pgtable_cfg *cfg = &data->iop.cfg;
533 arm_lpae_iopte *ptep = data->pgd;
534 int ret, lvl = data->start_level;
535 arm_lpae_iopte prot;
536 long iaext = (s64)iova >> cfg->ias;
537
538 if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize))
539 return -EINVAL;
540
541 if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
542 iaext = ~iaext;
543 if (WARN_ON(iaext || paddr >> cfg->oas))
544 return -ERANGE;
545
546 if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
547 return -EINVAL;
548
549 prot = arm_lpae_prot_to_pte(data, iommu_prot);
550 ret = __arm_lpae_map(data, iova, paddr, pgsize, pgcount, prot, lvl,
551 ptep, gfp, mapped);
552 /*
553 * Synchronise all PTE updates for the new mapping before there's
554 * a chance for anything to kick off a table walk for the new iova.
555 */
556 wmb();
557
558 return ret;
559 }
560
561 static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
562 arm_lpae_iopte *ptep)
563 {
564 arm_lpae_iopte *start, *end;
565 unsigned long table_size;
566
567 if (lvl == data->start_level)
568 table_size = ARM_LPAE_PGD_SIZE(data);
569 else
570 table_size = ARM_LPAE_GRANULE(data);
571
572 start = ptep;
573
574 /* Only leaf entries at the last level */
575 if (lvl == ARM_LPAE_MAX_LEVELS - 1)
576 end = ptep;
577 else
578 end = (void *)ptep + table_size;
579
580 while (ptep != end) {
581 arm_lpae_iopte pte = *ptep++;
582
583 if (!pte || iopte_leaf(pte, lvl, data->iop.fmt))
584 continue;
585
586 __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
587 }
588
589 __arm_lpae_free_pages(start, table_size, &data->iop.cfg, data->iop.cookie);
590 }
591
592 static void arm_lpae_free_pgtable(struct io_pgtable *iop)
593 {
594 struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
595
596 __arm_lpae_free_pgtable(data, data->start_level, data->pgd);
597 kfree(data);
598 }
599
600 static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
601 struct iommu_iotlb_gather *gather,
602 unsigned long iova, size_t size, size_t pgcount,
603 int lvl, arm_lpae_iopte *ptep)
604 {
605 arm_lpae_iopte pte;
606 struct io_pgtable *iop = &data->iop;
607 int i = 0, num_entries, max_entries, unmap_idx_start;
608
609 /* Something went horribly wrong and we ran out of page table */
610 if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
611 return 0;
612
613 unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
614 ptep += unmap_idx_start;
615 pte = READ_ONCE(*ptep);
616 if (WARN_ON(!pte))
617 return 0;
618
619 /* If the size matches this level, we're in the right place */
620 if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
621 max_entries = arm_lpae_max_entries(unmap_idx_start, data);
622 num_entries = min_t(int, pgcount, max_entries);
623
624 /* Find and handle non-leaf entries */
625 for (i = 0; i < num_entries; i++) {
626 pte = READ_ONCE(ptep[i]);
627 if (WARN_ON(!pte))
628 break;
629
630 if (!iopte_leaf(pte, lvl, iop->fmt)) {
631 __arm_lpae_clear_pte(&ptep[i], &iop->cfg, 1);
632
633 /* Also flush any partial walks */
634 io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
635 ARM_LPAE_GRANULE(data));
636 __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
637 }
638 }
639
640 /* Clear the remaining entries */
641 __arm_lpae_clear_pte(ptep, &iop->cfg, i);
642
643 if (gather && !iommu_iotlb_gather_queued(gather))
644 for (int j = 0; j < i; j++)
645 io_pgtable_tlb_add_page(iop, gather, iova + j * size, size);
646
647 return i * size;
648 } else if (iopte_leaf(pte, lvl, iop->fmt)) {
649 WARN_ONCE(true, "Unmap of a partial large IOPTE is not allowed");
650 return 0;
651 }
652
653 /* Keep on walkin' */
654 ptep = iopte_deref(pte, data);
655 return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl + 1, ptep);
656 }
657
658 static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
659 size_t pgsize, size_t pgcount,
660 struct iommu_iotlb_gather *gather)
661 {
662 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
663 struct io_pgtable_cfg *cfg = &data->iop.cfg;
664 arm_lpae_iopte *ptep = data->pgd;
665 long iaext = (s64)iova >> cfg->ias;
666
667 if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize || !pgcount))
668 return 0;
669
670 if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
671 iaext = ~iaext;
672 if (WARN_ON(iaext))
673 return 0;
674
675 return __arm_lpae_unmap(data, gather, iova, pgsize, pgcount,
676 data->start_level, ptep);
677 }
678
679 static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
680 unsigned long iova)
681 {
682 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
683 arm_lpae_iopte pte, *ptep = data->pgd;
684 int lvl = data->start_level;
685
686 do {
687 /* Valid IOPTE pointer? */
688 if (!ptep)
689 return 0;
690
691 /* Grab the IOPTE we're interested in */
692 ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
693 pte = READ_ONCE(*ptep);
694
695 /* Valid entry? */
696 if (!pte)
697 return 0;
698
699 /* Leaf entry? */
700 if (iopte_leaf(pte, lvl, data->iop.fmt))
701 goto found_translation;
702
703 /* Take it to the next level */
704 ptep = iopte_deref(pte, data);
705 } while (++lvl < ARM_LPAE_MAX_LEVELS);
706
707 /* Ran out of page tables to walk */
708 return 0;
709
710 found_translation:
711 iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
712 return iopte_to_paddr(pte, data) | iova;
713 }
714
715 struct io_pgtable_walk_data {
716 struct iommu_dirty_bitmap *dirty;
717 unsigned long flags;
718 u64 addr;
719 const u64 end;
720 };
721
722 static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
723 struct io_pgtable_walk_data *walk_data,
724 arm_lpae_iopte *ptep,
725 int lvl);
726
727 static int io_pgtable_visit_dirty(struct arm_lpae_io_pgtable *data,
728 struct io_pgtable_walk_data *walk_data,
729 arm_lpae_iopte *ptep, int lvl)
730 {
731 struct io_pgtable *iop = &data->iop;
732 arm_lpae_iopte pte = READ_ONCE(*ptep);
733
734 if (iopte_leaf(pte, lvl, iop->fmt)) {
735 size_t size = ARM_LPAE_BLOCK_SIZE(lvl, data);
736
737 if (iopte_writeable_dirty(pte)) {
738 iommu_dirty_bitmap_record(walk_data->dirty,
739 walk_data->addr, size);
740 if (!(walk_data->flags & IOMMU_DIRTY_NO_CLEAR))
741 iopte_set_writeable_clean(ptep);
742 }
743 walk_data->addr += size;
744 return 0;
745 }
746
747 if (WARN_ON(!iopte_table(pte, lvl)))
748 return -EINVAL;
749
750 ptep = iopte_deref(pte, data);
751 return __arm_lpae_iopte_walk_dirty(data, walk_data, ptep, lvl + 1);
752 }
753
754 static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
755 struct io_pgtable_walk_data *walk_data,
756 arm_lpae_iopte *ptep,
757 int lvl)
758 {
759 u32 idx;
760 int max_entries, ret;
761
762 if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
763 return -EINVAL;
764
765 if (lvl == data->start_level)
766 max_entries = ARM_LPAE_PGD_SIZE(data) / sizeof(arm_lpae_iopte);
767 else
768 max_entries = ARM_LPAE_PTES_PER_TABLE(data);
769
770 for (idx = ARM_LPAE_LVL_IDX(walk_data->addr, lvl, data);
771 (idx < max_entries) && (walk_data->addr < walk_data->end); ++idx) {
772 ret = io_pgtable_visit_dirty(data, walk_data, ptep + idx, lvl);
773 if (ret)
774 return ret;
775 }
776
777 return 0;
778 }
779
780 static int arm_lpae_read_and_clear_dirty(struct io_pgtable_ops *ops,
781 unsigned long iova, size_t size,
782 unsigned long flags,
783 struct iommu_dirty_bitmap *dirty)
784 {
785 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
786 struct io_pgtable_cfg *cfg = &data->iop.cfg;
787 struct io_pgtable_walk_data walk_data = {
788 .dirty = dirty,
789 .flags = flags,
790 .addr = iova,
791 .end = iova + size,
792 };
793 arm_lpae_iopte *ptep = data->pgd;
794 int lvl = data->start_level;
795
796 if (WARN_ON(!size))
797 return -EINVAL;
798 if (WARN_ON((iova + size - 1) & ~(BIT(cfg->ias) - 1)))
799 return -EINVAL;
800 if (data->iop.fmt != ARM_64_LPAE_S1)
801 return -EINVAL;
802
803 return __arm_lpae_iopte_walk_dirty(data, &walk_data, ptep, lvl);
804 }
805
806 static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
807 {
808 unsigned long granule, page_sizes;
809 unsigned int max_addr_bits = 48;
810
811 /*
812 * We need to restrict the supported page sizes to match the
813 * translation regime for a particular granule. Aim to match
814 * the CPU page size if possible, otherwise prefer smaller sizes.
815 * While we're at it, restrict the block sizes to match the
816 * chosen granule.
817 */
818 if (cfg->pgsize_bitmap & PAGE_SIZE)
819 granule = PAGE_SIZE;
820 else if (cfg->pgsize_bitmap & ~PAGE_MASK)
821 granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
822 else if (cfg->pgsize_bitmap & PAGE_MASK)
823 granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
824 else
825 granule = 0;
826
827 switch (granule) {
828 case SZ_4K:
829 page_sizes = (SZ_4K | SZ_2M | SZ_1G);
830 break;
831 case SZ_16K:
832 page_sizes = (SZ_16K | SZ_32M);
833 break;
834 case SZ_64K:
835 max_addr_bits = 52;
836 page_sizes = (SZ_64K | SZ_512M);
837 if (cfg->oas > 48)
838 page_sizes |= 1ULL << 42; /* 4TB */
839 break;
840 default:
841 page_sizes = 0;
842 }
843
844 cfg->pgsize_bitmap &= page_sizes;
845 cfg->ias = min(cfg->ias, max_addr_bits);
846 cfg->oas = min(cfg->oas, max_addr_bits);
847 }
848
849 static struct arm_lpae_io_pgtable *
850 arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
851 {
852 struct arm_lpae_io_pgtable *data;
853 int levels, va_bits, pg_shift;
854
855 arm_lpae_restrict_pgsizes(cfg);
856
857 if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
858 return NULL;
859
860 if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
861 return NULL;
862
863 if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
864 return NULL;
865
866 data = kmalloc(sizeof(*data), GFP_KERNEL);
867 if (!data)
868 return NULL;
869
870 pg_shift = __ffs(cfg->pgsize_bitmap);
871 data->bits_per_level = pg_shift - ilog2(sizeof(arm_lpae_iopte));
872
873 va_bits = cfg->ias - pg_shift;
874 levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
875 data->start_level = ARM_LPAE_MAX_LEVELS - levels;
876
877 /* Calculate the actual size of our pgd (without concatenation) */
878 data->pgd_bits = va_bits - (data->bits_per_level * (levels - 1));
879
880 data->iop.ops = (struct io_pgtable_ops) {
881 .map_pages = arm_lpae_map_pages,
882 .unmap_pages = arm_lpae_unmap_pages,
883 .iova_to_phys = arm_lpae_iova_to_phys,
884 .read_and_clear_dirty = arm_lpae_read_and_clear_dirty,
885 };
886
887 return data;
888 }
889
890 static struct io_pgtable *
891 arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
892 {
893 u64 reg;
894 struct arm_lpae_io_pgtable *data;
895 typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr;
896 bool tg1;
897
898 if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
899 IO_PGTABLE_QUIRK_ARM_TTBR1 |
900 IO_PGTABLE_QUIRK_ARM_OUTER_WBWA |
901 IO_PGTABLE_QUIRK_ARM_HD))
902 return NULL;
903
904 data = arm_lpae_alloc_pgtable(cfg);
905 if (!data)
906 return NULL;
907
908 /* TCR */
909 if (cfg->coherent_walk) {
910 tcr->sh = ARM_LPAE_TCR_SH_IS;
911 tcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
912 tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
913 if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA)
914 goto out_free_data;
915 } else {
916 tcr->sh = ARM_LPAE_TCR_SH_OS;
917 tcr->irgn = ARM_LPAE_TCR_RGN_NC;
918 if (!(cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
919 tcr->orgn = ARM_LPAE_TCR_RGN_NC;
920 else
921 tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
922 }
923
924 tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1;
925 switch (ARM_LPAE_GRANULE(data)) {
926 case SZ_4K:
927 tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K;
928 break;
929 case SZ_16K:
930 tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K;
931 break;
932 case SZ_64K:
933 tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K;
934 break;
935 }
936
937 switch (cfg->oas) {
938 case 32:
939 tcr->ips = ARM_LPAE_TCR_PS_32_BIT;
940 break;
941 case 36:
942 tcr->ips = ARM_LPAE_TCR_PS_36_BIT;
943 break;
944 case 40:
945 tcr->ips = ARM_LPAE_TCR_PS_40_BIT;
946 break;
947 case 42:
948 tcr->ips = ARM_LPAE_TCR_PS_42_BIT;
949 break;
950 case 44:
951 tcr->ips = ARM_LPAE_TCR_PS_44_BIT;
952 break;
953 case 48:
954 tcr->ips = ARM_LPAE_TCR_PS_48_BIT;
955 break;
956 case 52:
957 tcr->ips = ARM_LPAE_TCR_PS_52_BIT;
958 break;
959 default:
960 goto out_free_data;
961 }
962
963 tcr->tsz = 64ULL - cfg->ias;
964
965 /* MAIRs */
966 reg = (ARM_LPAE_MAIR_ATTR_NC
967 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
968 (ARM_LPAE_MAIR_ATTR_WBRWA
969 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
970 (ARM_LPAE_MAIR_ATTR_DEVICE
971 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)) |
972 (ARM_LPAE_MAIR_ATTR_INC_OWBRWA
973 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE));
974
975 cfg->arm_lpae_s1_cfg.mair = reg;
976
977 /* Looking good; allocate a pgd */
978 data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
979 GFP_KERNEL, cfg, cookie);
980 if (!data->pgd)
981 goto out_free_data;
982
983 /* Ensure the empty pgd is visible before any actual TTBR write */
984 wmb();
985
986 /* TTBR */
987 cfg->arm_lpae_s1_cfg.ttbr = virt_to_phys(data->pgd);
988 return &data->iop;
989
990 out_free_data:
991 kfree(data);
992 return NULL;
993 }
994
995 static struct io_pgtable *
996 arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
997 {
998 u64 sl;
999 struct arm_lpae_io_pgtable *data;
1000 typeof(&cfg->arm_lpae_s2_cfg.vtcr) vtcr = &cfg->arm_lpae_s2_cfg.vtcr;
1001
1002 if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_S2FWB))
1003 return NULL;
1004
1005 data = arm_lpae_alloc_pgtable(cfg);
1006 if (!data)
1007 return NULL;
1008
1009 /*
1010 * Concatenate PGDs at level 1 if possible in order to reduce
1011 * the depth of the stage-2 walk.
1012 */
1013 if (data->start_level == 0) {
1014 unsigned long pgd_pages;
1015
1016 pgd_pages = ARM_LPAE_PGD_SIZE(data) / sizeof(arm_lpae_iopte);
1017 if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
1018 data->pgd_bits += data->bits_per_level;
1019 data->start_level++;
1020 }
1021 }
1022
1023 /* VTCR */
1024 if (cfg->coherent_walk) {
1025 vtcr->sh = ARM_LPAE_TCR_SH_IS;
1026 vtcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
1027 vtcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
1028 } else {
1029 vtcr->sh = ARM_LPAE_TCR_SH_OS;
1030 vtcr->irgn = ARM_LPAE_TCR_RGN_NC;
1031 vtcr->orgn = ARM_LPAE_TCR_RGN_NC;
1032 }
1033
1034 sl = data->start_level;
1035
1036 switch (ARM_LPAE_GRANULE(data)) {
1037 case SZ_4K:
1038 vtcr->tg = ARM_LPAE_TCR_TG0_4K;
1039 sl++; /* SL0 format is different for 4K granule size */
1040 break;
1041 case SZ_16K:
1042 vtcr->tg = ARM_LPAE_TCR_TG0_16K;
1043 break;
1044 case SZ_64K:
1045 vtcr->tg = ARM_LPAE_TCR_TG0_64K;
1046 break;
1047 }
1048
1049 switch (cfg->oas) {
1050 case 32:
1051 vtcr->ps = ARM_LPAE_TCR_PS_32_BIT;
1052 break;
1053 case 36:
1054 vtcr->ps = ARM_LPAE_TCR_PS_36_BIT;
1055 break;
1056 case 40:
1057 vtcr->ps = ARM_LPAE_TCR_PS_40_BIT;
1058 break;
1059 case 42:
1060 vtcr->ps = ARM_LPAE_TCR_PS_42_BIT;
1061 break;
1062 case 44:
1063 vtcr->ps = ARM_LPAE_TCR_PS_44_BIT;
1064 break;
1065 case 48:
1066 vtcr->ps = ARM_LPAE_TCR_PS_48_BIT;
1067 break;
1068 case 52:
1069 vtcr->ps = ARM_LPAE_TCR_PS_52_BIT;
1070 break;
1071 default:
1072 goto out_free_data;
1073 }
1074
1075 vtcr->tsz = 64ULL - cfg->ias;
1076 vtcr->sl = ~sl & ARM_LPAE_VTCR_SL0_MASK;
1077
1078 /* Allocate pgd pages */
1079 data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
1080 GFP_KERNEL, cfg, cookie);
1081 if (!data->pgd)
1082 goto out_free_data;
1083
1084 /* Ensure the empty pgd is visible before any actual TTBR write */
1085 wmb();
1086
1087 /* VTTBR */
1088 cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
1089 return &data->iop;
1090
1091 out_free_data:
1092 kfree(data);
1093 return NULL;
1094 }
1095
1096 static struct io_pgtable *
1097 arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
1098 {
1099 if (cfg->ias > 32 || cfg->oas > 40)
1100 return NULL;
1101
1102 cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1103 return arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
1104 }
1105
1106 static struct io_pgtable *
1107 arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
1108 {
1109 if (cfg->ias > 40 || cfg->oas > 40)
1110 return NULL;
1111
1112 cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1113 return arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
1114 }
1115
1116 static struct io_pgtable *
1117 arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
1118 {
1119 struct arm_lpae_io_pgtable *data;
1120
1121 /* No quirks for Mali (hopefully) */
1122 if (cfg->quirks)
1123 return NULL;
1124
1125 if (cfg->ias > 48 || cfg->oas > 40)
1126 return NULL;
1127
1128 cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1129
1130 data = arm_lpae_alloc_pgtable(cfg);
1131 if (!data)
1132 return NULL;
1133
1134 /* Mali seems to need a full 4-level table regardless of IAS */
1135 if (data->start_level > 0) {
1136 data->start_level = 0;
1137 data->pgd_bits = 0;
1138 }
1139 /*
1140 * MEMATTR: Mali has no actual notion of a non-cacheable type, so the
1141 * best we can do is mimic the out-of-tree driver and hope that the
1142 * "implementation-defined caching policy" is good enough. Similarly,
1143 * we'll use it for the sake of a valid attribute for our 'device'
1144 * index, although callers should never request that in practice.
1145 */
1146 cfg->arm_mali_lpae_cfg.memattr =
1147 (ARM_MALI_LPAE_MEMATTR_IMP_DEF
1148 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
1149 (ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC
1150 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
1151 (ARM_MALI_LPAE_MEMATTR_IMP_DEF
1152 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
1153
1154 data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
1155 cfg, cookie);
1156 if (!data->pgd)
1157 goto out_free_data;
1158
1159 /* Ensure the empty pgd is visible before TRANSTAB can be written */
1160 wmb();
1161
1162 cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
1163 ARM_MALI_LPAE_TTBR_READ_INNER |
1164 ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
1165 if (cfg->coherent_walk)
1166 cfg->arm_mali_lpae_cfg.transtab |= ARM_MALI_LPAE_TTBR_SHARE_OUTER;
1167
1168 return &data->iop;
1169
1170 out_free_data:
1171 kfree(data);
1172 return NULL;
1173 }
1174
1175 struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
1176 .caps = IO_PGTABLE_CAP_CUSTOM_ALLOCATOR,
1177 .alloc = arm_64_lpae_alloc_pgtable_s1,
1178 .free = arm_lpae_free_pgtable,
1179 };
1180
1181 struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
1182 .caps = IO_PGTABLE_CAP_CUSTOM_ALLOCATOR,
1183 .alloc = arm_64_lpae_alloc_pgtable_s2,
1184 .free = arm_lpae_free_pgtable,
1185 };
1186
1187 struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
1188 .caps = IO_PGTABLE_CAP_CUSTOM_ALLOCATOR,
1189 .alloc = arm_32_lpae_alloc_pgtable_s1,
1190 .free = arm_lpae_free_pgtable,
1191 };
1192
1193 struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
1194 .caps = IO_PGTABLE_CAP_CUSTOM_ALLOCATOR,
1195 .alloc = arm_32_lpae_alloc_pgtable_s2,
1196 .free = arm_lpae_free_pgtable,
1197 };
1198
1199 struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = {
1200 .caps = IO_PGTABLE_CAP_CUSTOM_ALLOCATOR,
1201 .alloc = arm_mali_lpae_alloc_pgtable,
1202 .free = arm_lpae_free_pgtable,
1203 };
1204
1205 #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
1206
1207 static struct io_pgtable_cfg *cfg_cookie __initdata;
1208
1209 static void __init dummy_tlb_flush_all(void *cookie)
1210 {
1211 WARN_ON(cookie != cfg_cookie);
1212 }
1213
1214 static void __init dummy_tlb_flush(unsigned long iova, size_t size,
1215 size_t granule, void *cookie)
1216 {
1217 WARN_ON(cookie != cfg_cookie);
1218 WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
1219 }
1220
1221 static void __init dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
1222 unsigned long iova, size_t granule,
1223 void *cookie)
1224 {
1225 dummy_tlb_flush(iova, granule, granule, cookie);
1226 }
1227
1228 static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
1229 .tlb_flush_all = dummy_tlb_flush_all,
1230 .tlb_flush_walk = dummy_tlb_flush,
1231 .tlb_add_page = dummy_tlb_add_page,
1232 };
1233
1234 static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
1235 {
1236 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
1237 struct io_pgtable_cfg *cfg = &data->iop.cfg;
1238
1239 pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
1240 cfg->pgsize_bitmap, cfg->ias);
1241 pr_err("data: %d levels, 0x%zx pgd_size, %u pg_shift, %u bits_per_level, pgd @ %p\n",
1242 ARM_LPAE_MAX_LEVELS - data->start_level, ARM_LPAE_PGD_SIZE(data),
1243 ilog2(ARM_LPAE_GRANULE(data)), data->bits_per_level, data->pgd);
1244 }
1245
1246 #define __FAIL(ops, i) ({ \
1247 WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \
1248 arm_lpae_dump_ops(ops); \
1249 selftest_running = false; \
1250 -EFAULT; \
1251 })
1252
1253 static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
1254 {
1255 static const enum io_pgtable_fmt fmts[] __initconst = {
1256 ARM_64_LPAE_S1,
1257 ARM_64_LPAE_S2,
1258 };
1259
1260 int i, j;
1261 unsigned long iova;
1262 size_t size, mapped;
1263 struct io_pgtable_ops *ops;
1264
1265 selftest_running = true;
1266
1267 for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
1268 cfg_cookie = cfg;
1269 ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
1270 if (!ops) {
1271 pr_err("selftest: failed to allocate io pgtable ops\n");
1272 return -ENOMEM;
1273 }
1274
1275 /*
1276 * Initial sanity checks.
1277 * Empty page tables shouldn't provide any translations.
1278 */
1279 if (ops->iova_to_phys(ops, 42))
1280 return __FAIL(ops, i);
1281
1282 if (ops->iova_to_phys(ops, SZ_1G + 42))
1283 return __FAIL(ops, i);
1284
1285 if (ops->iova_to_phys(ops, SZ_2G + 42))
1286 return __FAIL(ops, i);
1287
1288 /*
1289 * Distinct mappings of different granule sizes.
1290 */
1291 iova = 0;
1292 for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1293 size = 1UL << j;
1294
1295 if (ops->map_pages(ops, iova, iova, size, 1,
1296 IOMMU_READ | IOMMU_WRITE |
1297 IOMMU_NOEXEC | IOMMU_CACHE,
1298 GFP_KERNEL, &mapped))
1299 return __FAIL(ops, i);
1300
1301 /* Overlapping mappings */
1302 if (!ops->map_pages(ops, iova, iova + size, size, 1,
1303 IOMMU_READ | IOMMU_NOEXEC,
1304 GFP_KERNEL, &mapped))
1305 return __FAIL(ops, i);
1306
1307 if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1308 return __FAIL(ops, i);
1309
1310 iova += SZ_1G;
1311 }
1312
1313 /* Full unmap */
1314 iova = 0;
1315 for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1316 size = 1UL << j;
1317
1318 if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
1319 return __FAIL(ops, i);
1320
1321 if (ops->iova_to_phys(ops, iova + 42))
1322 return __FAIL(ops, i);
1323
1324 /* Remap full block */
1325 if (ops->map_pages(ops, iova, iova, size, 1,
1326 IOMMU_WRITE, GFP_KERNEL, &mapped))
1327 return __FAIL(ops, i);
1328
1329 if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1330 return __FAIL(ops, i);
1331
1332 iova += SZ_1G;
1333 }
1334
1335 /*
1336 * Map/unmap the last largest supported page of the IAS, this can
1337 * trigger corner cases in the concatednated page tables.
1338 */
1339 mapped = 0;
1340 size = 1UL << __fls(cfg->pgsize_bitmap);
1341 iova = (1UL << cfg->ias) - size;
1342 if (ops->map_pages(ops, iova, iova, size, 1,
1343 IOMMU_READ | IOMMU_WRITE |
1344 IOMMU_NOEXEC | IOMMU_CACHE,
1345 GFP_KERNEL, &mapped))
1346 return __FAIL(ops, i);
1347 if (mapped != size)
1348 return __FAIL(ops, i);
1349 if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
1350 return __FAIL(ops, i);
1351
1352 free_io_pgtable_ops(ops);
1353 }
1354
1355 selftest_running = false;
1356 return 0;
1357 }
1358
1359 static int __init arm_lpae_do_selftests(void)
1360 {
1361 static const unsigned long pgsize[] __initconst = {
1362 SZ_4K | SZ_2M | SZ_1G,
1363 SZ_16K | SZ_32M,
1364 SZ_64K | SZ_512M,
1365 };
1366
1367 static const unsigned int ias[] __initconst = {
1368 32, 36, 40, 42, 44, 48,
1369 };
1370
1371 int i, j, pass = 0, fail = 0;
1372 struct device dev;
1373 struct io_pgtable_cfg cfg = {
1374 .tlb = &dummy_tlb_ops,
1375 .oas = 48,
1376 .coherent_walk = true,
1377 .iommu_dev = &dev,
1378 };
1379
1380 /* __arm_lpae_alloc_pages() merely needs dev_to_node() to work */
1381 set_dev_node(&dev, NUMA_NO_NODE);
1382
1383 for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
1384 for (j = 0; j < ARRAY_SIZE(ias); ++j) {
1385 cfg.pgsize_bitmap = pgsize[i];
1386 cfg.ias = ias[j];
1387 pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
1388 pgsize[i], ias[j]);
1389 if (arm_lpae_run_tests(&cfg))
1390 fail++;
1391 else
1392 pass++;
1393 }
1394 }
1395
1396 pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
1397 return fail ? -EFAULT : 0;
1398 }
1399 subsys_initcall(arm_lpae_do_selftests);
1400 #endif
Kernel DRM miscellaneous fixes and cross-tree changes