2 * CPU-agnostic ARM page table allocator.
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.
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.
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/>.
16 * Copyright (C) 2014 ARM Limited
18 * Author: Will Deacon <will.deacon@arm.com>
21 #define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
23 #include <linux/atomic.h>
24 #include <linux/bitops.h>
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>
30 #include <linux/dma-mapping.h>
32 #include <asm/barrier.h>
34 #include "io-pgtable.h"
36 #define ARM_LPAE_MAX_ADDR_BITS 52
37 #define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
38 #define ARM_LPAE_MAX_LEVELS 4
40 /* Struct accessors */
41 #define io_pgtable_to_data(x) \
42 container_of((x), struct arm_lpae_io_pgtable, iop)
44 #define io_pgtable_ops_to_data(x) \
45 io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
48 * For consistency with the architecture, we always consider
49 * ARM_LPAE_MAX_LEVELS levels, with the walk starting at level n >=0
51 #define ARM_LPAE_START_LVL(d) (ARM_LPAE_MAX_LEVELS - (d)->levels)
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.
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)
61 #define ARM_LPAE_GRANULE(d) (1UL << (d)->pg_shift)
63 #define ARM_LPAE_PAGES_PER_PGD(d) \
64 DIV_ROUND_UP((d)->pgd_size, ARM_LPAE_GRANULE(d))
67 * Calculate the index at level l used to map virtual address a using the
70 #define ARM_LPAE_PGD_IDX(l,d) \
71 ((l) == ARM_LPAE_START_LVL(d) ? ilog2(ARM_LPAE_PAGES_PER_PGD(d)) : 0)
73 #define ARM_LPAE_LVL_IDX(a,l,d) \
74 (((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
75 ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
77 /* Calculate the block/page mapping size at level l for pagetable in d. */
78 #define ARM_LPAE_BLOCK_SIZE(l,d) \
79 (1ULL << (ilog2(sizeof(arm_lpae_iopte)) + \
80 ((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level)))
83 #define ARM_LPAE_PTE_TYPE_SHIFT 0
84 #define ARM_LPAE_PTE_TYPE_MASK 0x3
86 #define ARM_LPAE_PTE_TYPE_BLOCK 1
87 #define ARM_LPAE_PTE_TYPE_TABLE 3
88 #define ARM_LPAE_PTE_TYPE_PAGE 3
90 #define ARM_LPAE_PTE_ADDR_MASK GENMASK_ULL(47,12)
92 #define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
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)
98 #define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5)
99 #define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0)
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)
106 /* Software bit for solving coherency races */
107 #define ARM_LPAE_PTE_SW_SYNC (((arm_lpae_iopte)1) << 55)
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)
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)
124 #define ARM_32_LPAE_TCR_EAE (1 << 31)
125 #define ARM_64_LPAE_S2_TCR_RES1 (1 << 31)
127 #define ARM_LPAE_TCR_EPD1 (1 << 23)
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)
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
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
147 #define ARM_LPAE_TCR_SL0_SHIFT 6
148 #define ARM_LPAE_TCR_SL0_MASK 0x3
150 #define ARM_LPAE_TCR_T0SZ_SHIFT 0
151 #define ARM_LPAE_TCR_SZ_MASK 0xf
153 #define ARM_LPAE_TCR_PS_SHIFT 16
154 #define ARM_LPAE_TCR_PS_MASK 0x7
156 #define ARM_LPAE_TCR_IPS_SHIFT 32
157 #define ARM_LPAE_TCR_IPS_MASK 0x7
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
165 #define ARM_LPAE_TCR_PS_52_BIT 0x6ULL
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
176 /* IOPTE accessors */
177 #define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
179 #define iopte_type(pte,l) \
180 (((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
182 #define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
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))
189 struct arm_lpae_io_pgtable {
190 struct io_pgtable iop;
194 unsigned long pg_shift;
195 unsigned long bits_per_level;
200 typedef u64 arm_lpae_iopte;
202 static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
203 struct arm_lpae_io_pgtable *data)
205 arm_lpae_iopte pte = paddr;
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;
211 static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
212 struct arm_lpae_io_pgtable *data)
214 u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
216 if (data->pg_shift < 16)
219 /* Rotate the packed high-order bits back to the top */
220 return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4);
223 static bool selftest_running = false;
225 static dma_addr_t __arm_lpae_dma_addr(void *pages)
227 return (dma_addr_t)virt_to_phys(pages);
230 static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
231 struct io_pgtable_cfg *cfg)
233 struct device *dev = cfg->iommu_dev;
234 int order = get_order(size);
239 VM_BUG_ON((gfp & __GFP_HIGHMEM));
240 p = alloc_pages_node(dev_to_node(dev), gfp | __GFP_ZERO, order);
244 pages = page_address(p);
245 if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA)) {
246 dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
247 if (dma_mapping_error(dev, dma))
250 * We depend on the IOMMU being able to work with any physical
251 * address directly, so if the DMA layer suggests otherwise by
252 * translating or truncating them, that bodes very badly...
254 if (dma != virt_to_phys(pages))
261 dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
262 dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
264 __free_pages(p, order);
268 static void __arm_lpae_free_pages(void *pages, size_t size,
269 struct io_pgtable_cfg *cfg)
271 if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA))
272 dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
273 size, DMA_TO_DEVICE);
274 free_pages((unsigned long)pages, get_order(size));
277 static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep,
278 struct io_pgtable_cfg *cfg)
280 dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
281 sizeof(*ptep), DMA_TO_DEVICE);
284 static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
285 struct io_pgtable_cfg *cfg)
289 if (!(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA))
290 __arm_lpae_sync_pte(ptep, cfg);
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);
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)
301 arm_lpae_iopte pte = prot;
303 if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
304 pte |= ARM_LPAE_PTE_NS;
306 if (lvl == ARM_LPAE_MAX_LEVELS - 1)
307 pte |= ARM_LPAE_PTE_TYPE_PAGE;
309 pte |= ARM_LPAE_PTE_TYPE_BLOCK;
311 pte |= ARM_LPAE_PTE_AF | ARM_LPAE_PTE_SH_IS;
312 pte |= paddr_to_iopte(paddr, data);
314 __arm_lpae_set_pte(ptep, pte, &data->iop.cfg);
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)
322 arm_lpae_iopte pte = *ptep;
324 if (iopte_leaf(pte, lvl)) {
325 /* We require an unmap first */
326 WARN_ON(!selftest_running);
328 } else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
330 * We need to unmap and free the old table before
331 * overwriting it with a block entry.
333 arm_lpae_iopte *tblp;
334 size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
336 tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
337 if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz))
341 __arm_lpae_init_pte(data, paddr, prot, lvl, ptep);
345 static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
346 arm_lpae_iopte *ptep,
348 struct io_pgtable_cfg *cfg)
350 arm_lpae_iopte old, new;
352 new = __pa(table) | ARM_LPAE_PTE_TYPE_TABLE;
353 if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
354 new |= ARM_LPAE_PTE_NSTABLE;
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.
363 old = cmpxchg64_relaxed(ptep, curr, new);
365 if ((cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA) ||
366 (old & ARM_LPAE_PTE_SW_SYNC))
369 /* Even if it's not ours, there's no point waiting; just kick it */
370 __arm_lpae_sync_pte(ptep, cfg);
372 WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
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)
381 arm_lpae_iopte *cptep, pte;
382 size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
383 size_t tblsz = ARM_LPAE_GRANULE(data);
384 struct io_pgtable_cfg *cfg = &data->iop.cfg;
386 /* Find our entry at the current level */
387 ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
389 /* If we can install a leaf entry at this level, then do so */
390 if (size == block_size && (size & cfg->pgsize_bitmap))
391 return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
393 /* We can't allocate tables at the final level */
394 if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
397 /* Grab a pointer to the next level */
398 pte = READ_ONCE(*ptep);
400 cptep = __arm_lpae_alloc_pages(tblsz, GFP_ATOMIC, cfg);
404 pte = arm_lpae_install_table(cptep, ptep, 0, cfg);
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);
412 if (pte && !iopte_leaf(pte, lvl)) {
413 cptep = iopte_deref(pte, data);
415 /* We require an unmap first */
416 WARN_ON(!selftest_running);
421 return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep);
424 static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
429 if (data->iop.fmt == ARM_64_LPAE_S1 ||
430 data->iop.fmt == ARM_32_LPAE_S1) {
431 pte = ARM_LPAE_PTE_nG;
433 if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
434 pte |= ARM_LPAE_PTE_AP_RDONLY;
436 if (!(prot & IOMMU_PRIV))
437 pte |= ARM_LPAE_PTE_AP_UNPRIV;
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)
443 pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
444 << ARM_LPAE_PTE_ATTRINDX_SHIFT);
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;
451 if (prot & IOMMU_MMIO)
452 pte |= ARM_LPAE_PTE_MEMATTR_DEV;
453 else if (prot & IOMMU_CACHE)
454 pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
456 pte |= ARM_LPAE_PTE_MEMATTR_NC;
459 if (prot & IOMMU_NOEXEC)
460 pte |= ARM_LPAE_PTE_XN;
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)
468 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
469 arm_lpae_iopte *ptep = data->pgd;
470 int ret, lvl = ARM_LPAE_START_LVL(data);
473 /* If no access, then nothing to do */
474 if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
477 if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
478 paddr >= (1ULL << data->iop.cfg.oas)))
481 prot = arm_lpae_prot_to_pte(data, iommu_prot);
482 ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
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.
492 static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
493 arm_lpae_iopte *ptep)
495 arm_lpae_iopte *start, *end;
496 unsigned long table_size;
498 if (lvl == ARM_LPAE_START_LVL(data))
499 table_size = data->pgd_size;
501 table_size = ARM_LPAE_GRANULE(data);
505 /* Only leaf entries at the last level */
506 if (lvl == ARM_LPAE_MAX_LEVELS - 1)
509 end = (void *)ptep + table_size;
511 while (ptep != end) {
512 arm_lpae_iopte pte = *ptep++;
514 if (!pte || iopte_leaf(pte, lvl))
517 __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
520 __arm_lpae_free_pages(start, table_size, &data->iop.cfg);
523 static void arm_lpae_free_pgtable(struct io_pgtable *iop)
525 struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
527 __arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd);
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)
536 struct io_pgtable_cfg *cfg = &data->iop.cfg;
537 arm_lpae_iopte pte, *tablep;
538 phys_addr_t blk_paddr;
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;
543 if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
546 tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
548 return 0; /* Bytes unmapped */
550 if (size == split_sz)
551 unmap_idx = ARM_LPAE_LVL_IDX(iova, lvl, data);
553 blk_paddr = iopte_to_paddr(blk_pte, data);
554 pte = iopte_prot(blk_pte);
556 for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz) {
561 __arm_lpae_init_pte(data, blk_paddr, pte, lvl, &tablep[i]);
564 pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg);
565 if (pte != blk_pte) {
566 __arm_lpae_free_pages(tablep, tablesz, cfg);
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.
572 if (iopte_type(pte, lvl - 1) != ARM_LPAE_PTE_TYPE_TABLE)
575 tablep = iopte_deref(pte, data);
579 return __arm_lpae_unmap(data, iova, size, lvl, tablep);
581 io_pgtable_tlb_add_flush(&data->iop, iova, size, size, true);
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)
590 struct io_pgtable *iop = &data->iop;
592 /* Something went horribly wrong and we ran out of page table */
593 if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
596 ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
597 pte = READ_ONCE(*ptep);
601 /* If the size matches this level, we're in the right place */
602 if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
603 __arm_lpae_set_pte(ptep, 0, &iop->cfg);
605 if (!iopte_leaf(pte, lvl)) {
606 /* Also flush any partial walks */
607 io_pgtable_tlb_add_flush(iop, iova, size,
608 ARM_LPAE_GRANULE(data), false);
609 io_pgtable_tlb_sync(iop);
610 ptep = iopte_deref(pte, data);
611 __arm_lpae_free_pgtable(data, lvl + 1, ptep);
613 io_pgtable_tlb_add_flush(iop, iova, size, size, true);
617 } else if (iopte_leaf(pte, lvl)) {
619 * Insert a table at the next level to map the old region,
620 * minus the part we want to unmap
622 return arm_lpae_split_blk_unmap(data, iova, size, pte,
626 /* Keep on walkin' */
627 ptep = iopte_deref(pte, data);
628 return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep);
631 static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
634 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
635 arm_lpae_iopte *ptep = data->pgd;
636 int lvl = ARM_LPAE_START_LVL(data);
638 if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias)))
641 return __arm_lpae_unmap(data, iova, size, lvl, ptep);
644 static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
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);
652 /* Valid IOPTE pointer? */
656 /* Grab the IOPTE we're interested in */
657 ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
658 pte = READ_ONCE(*ptep);
665 if (iopte_leaf(pte,lvl))
666 goto found_translation;
668 /* Take it to the next level */
669 ptep = iopte_deref(pte, data);
670 } while (++lvl < ARM_LPAE_MAX_LEVELS);
672 /* Ran out of page tables to walk */
676 iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
677 return iopte_to_paddr(pte, data) | iova;
680 static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
682 unsigned long granule, page_sizes;
683 unsigned int max_addr_bits = 48;
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
692 if (cfg->pgsize_bitmap & 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);
703 page_sizes = (SZ_4K | SZ_2M | SZ_1G);
706 page_sizes = (SZ_16K | SZ_32M);
710 page_sizes = (SZ_64K | SZ_512M);
712 page_sizes |= 1ULL << 42; /* 4TB */
718 cfg->pgsize_bitmap &= page_sizes;
719 cfg->ias = min(cfg->ias, max_addr_bits);
720 cfg->oas = min(cfg->oas, max_addr_bits);
723 static struct arm_lpae_io_pgtable *
724 arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
726 unsigned long va_bits, pgd_bits;
727 struct arm_lpae_io_pgtable *data;
729 arm_lpae_restrict_pgsizes(cfg);
731 if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
734 if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
737 if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
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");
745 data = kmalloc(sizeof(*data), GFP_KERNEL);
749 data->pg_shift = __ffs(cfg->pgsize_bitmap);
750 data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));
752 va_bits = cfg->ias - data->pg_shift;
753 data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
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)));
759 data->iop.ops = (struct io_pgtable_ops) {
761 .unmap = arm_lpae_unmap,
762 .iova_to_phys = arm_lpae_iova_to_phys,
768 static struct io_pgtable *
769 arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
772 struct arm_lpae_io_pgtable *data;
774 if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA))
777 data = arm_lpae_alloc_pgtable(cfg);
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);
786 switch (ARM_LPAE_GRANULE(data)) {
788 reg |= ARM_LPAE_TCR_TG0_4K;
791 reg |= ARM_LPAE_TCR_TG0_16K;
794 reg |= ARM_LPAE_TCR_TG0_64K;
800 reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_IPS_SHIFT);
803 reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_IPS_SHIFT);
806 reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_IPS_SHIFT);
809 reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_IPS_SHIFT);
812 reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_IPS_SHIFT);
815 reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_IPS_SHIFT);
818 reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_IPS_SHIFT);
824 reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
826 /* Disable speculative walks through TTBR1 */
827 reg |= ARM_LPAE_TCR_EPD1;
828 cfg->arm_lpae_s1_cfg.tcr = reg;
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));
838 cfg->arm_lpae_s1_cfg.mair[0] = reg;
839 cfg->arm_lpae_s1_cfg.mair[1] = 0;
841 /* Looking good; allocate a pgd */
842 data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
846 /* Ensure the empty pgd is visible before any actual TTBR write */
850 cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
851 cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
859 static struct io_pgtable *
860 arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
863 struct arm_lpae_io_pgtable *data;
865 /* The NS quirk doesn't apply at stage 2 */
866 if (cfg->quirks & ~IO_PGTABLE_QUIRK_NO_DMA)
869 data = arm_lpae_alloc_pgtable(cfg);
874 * Concatenate PGDs at level 1 if possible in order to reduce
875 * the depth of the stage-2 walk.
877 if (data->levels == ARM_LPAE_MAX_LEVELS) {
878 unsigned long pgd_pages;
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;
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);
893 sl = ARM_LPAE_START_LVL(data);
895 switch (ARM_LPAE_GRANULE(data)) {
897 reg |= ARM_LPAE_TCR_TG0_4K;
898 sl++; /* SL0 format is different for 4K granule size */
901 reg |= ARM_LPAE_TCR_TG0_16K;
904 reg |= ARM_LPAE_TCR_TG0_64K;
910 reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_PS_SHIFT);
913 reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_PS_SHIFT);
916 reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_PS_SHIFT);
919 reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_PS_SHIFT);
922 reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_PS_SHIFT);
925 reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_PS_SHIFT);
928 reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_PS_SHIFT);
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;
938 /* Allocate pgd pages */
939 data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
943 /* Ensure the empty pgd is visible before any actual TTBR write */
947 cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
955 static struct io_pgtable *
956 arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
958 struct io_pgtable *iop;
960 if (cfg->ias > 32 || cfg->oas > 40)
963 cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
964 iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
966 cfg->arm_lpae_s1_cfg.tcr |= ARM_32_LPAE_TCR_EAE;
967 cfg->arm_lpae_s1_cfg.tcr &= 0xffffffff;
973 static struct io_pgtable *
974 arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
976 struct io_pgtable *iop;
978 if (cfg->ias > 40 || cfg->oas > 40)
981 cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
982 iop = arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
984 cfg->arm_lpae_s2_cfg.vtcr &= 0xffffffff;
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,
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,
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,
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,
1009 #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
1011 static struct io_pgtable_cfg *cfg_cookie;
1013 static void dummy_tlb_flush_all(void *cookie)
1015 WARN_ON(cookie != cfg_cookie);
1018 static void dummy_tlb_add_flush(unsigned long iova, size_t size,
1019 size_t granule, bool leaf, void *cookie)
1021 WARN_ON(cookie != cfg_cookie);
1022 WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
1025 static void dummy_tlb_sync(void *cookie)
1027 WARN_ON(cookie != cfg_cookie);
1030 static const struct iommu_gather_ops dummy_tlb_ops __initconst = {
1031 .tlb_flush_all = dummy_tlb_flush_all,
1032 .tlb_add_flush = dummy_tlb_add_flush,
1033 .tlb_sync = dummy_tlb_sync,
1036 static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
1038 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
1039 struct io_pgtable_cfg *cfg = &data->iop.cfg;
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);
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; \
1055 static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
1057 static const enum io_pgtable_fmt fmts[] = {
1065 struct io_pgtable_ops *ops;
1067 selftest_running = true;
1069 for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
1071 ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
1073 pr_err("selftest: failed to allocate io pgtable ops\n");
1078 * Initial sanity checks.
1079 * Empty page tables shouldn't provide any translations.
1081 if (ops->iova_to_phys(ops, 42))
1082 return __FAIL(ops, i);
1084 if (ops->iova_to_phys(ops, SZ_1G + 42))
1085 return __FAIL(ops, i);
1087 if (ops->iova_to_phys(ops, SZ_2G + 42))
1088 return __FAIL(ops, i);
1091 * Distinct mappings of different granule sizes.
1094 for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1097 if (ops->map(ops, iova, iova, size, IOMMU_READ |
1101 return __FAIL(ops, i);
1103 /* Overlapping mappings */
1104 if (!ops->map(ops, iova, iova + size, size,
1105 IOMMU_READ | IOMMU_NOEXEC))
1106 return __FAIL(ops, i);
1108 if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1109 return __FAIL(ops, i);
1115 size = 1UL << __ffs(cfg->pgsize_bitmap);
1116 if (ops->unmap(ops, SZ_1G + size, size) != size)
1117 return __FAIL(ops, i);
1119 /* Remap of partial unmap */
1120 if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ))
1121 return __FAIL(ops, i);
1123 if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
1124 return __FAIL(ops, i);
1128 for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1131 if (ops->unmap(ops, iova, size) != size)
1132 return __FAIL(ops, i);
1134 if (ops->iova_to_phys(ops, iova + 42))
1135 return __FAIL(ops, i);
1137 /* Remap full block */
1138 if (ops->map(ops, iova, iova, size, IOMMU_WRITE))
1139 return __FAIL(ops, i);
1141 if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1142 return __FAIL(ops, i);
1147 free_io_pgtable_ops(ops);
1150 selftest_running = false;
1154 static int __init arm_lpae_do_selftests(void)
1156 static const unsigned long pgsize[] = {
1157 SZ_4K | SZ_2M | SZ_1G,
1162 static const unsigned int ias[] = {
1163 32, 36, 40, 42, 44, 48,
1166 int i, j, pass = 0, fail = 0;
1167 struct io_pgtable_cfg cfg = {
1168 .tlb = &dummy_tlb_ops,
1170 .quirks = IO_PGTABLE_QUIRK_NO_DMA,
1173 for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
1174 for (j = 0; j < ARRAY_SIZE(ias); ++j) {
1175 cfg.pgsize_bitmap = pgsize[i];
1177 pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
1179 if (arm_lpae_run_tests(&cfg))
1186 pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
1187 return fail ? -EFAULT : 0;
1189 subsys_initcall(arm_lpae_do_selftests);