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v5.9
   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#define ARM_LPAE_MAX_ADDR_BITS		52
  24#define ARM_LPAE_S2_MAX_CONCAT_PAGES	16
  25#define ARM_LPAE_MAX_LEVELS		4
  26
  27/* Struct accessors */
  28#define io_pgtable_to_data(x)						\
  29	container_of((x), struct arm_lpae_io_pgtable, iop)
  30
  31#define io_pgtable_ops_to_data(x)					\
  32	io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
  33
  34/*
 
 
 
 
 
 
  35 * Calculate the right shift amount to get to the portion describing level l
  36 * in a virtual address mapped by the pagetable in d.
  37 */
  38#define ARM_LPAE_LVL_SHIFT(l,d)						\
  39	(((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level) +		\
  40	ilog2(sizeof(arm_lpae_iopte)))
  41
  42#define ARM_LPAE_GRANULE(d)						\
  43	(sizeof(arm_lpae_iopte) << (d)->bits_per_level)
  44#define ARM_LPAE_PGD_SIZE(d)						\
  45	(sizeof(arm_lpae_iopte) << (d)->pgd_bits)
  46
  47/*
  48 * Calculate the index at level l used to map virtual address a using the
  49 * pagetable in d.
  50 */
  51#define ARM_LPAE_PGD_IDX(l,d)						\
  52	((l) == (d)->start_level ? (d)->pgd_bits - (d)->bits_per_level : 0)
  53
  54#define ARM_LPAE_LVL_IDX(a,l,d)						\
  55	(((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) &			\
  56	 ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
  57
  58/* Calculate the block/page mapping size at level l for pagetable in d. */
  59#define ARM_LPAE_BLOCK_SIZE(l,d)	(1ULL << ARM_LPAE_LVL_SHIFT(l,d))
 
 
  60
  61/* Page table bits */
  62#define ARM_LPAE_PTE_TYPE_SHIFT		0
  63#define ARM_LPAE_PTE_TYPE_MASK		0x3
  64
  65#define ARM_LPAE_PTE_TYPE_BLOCK		1
  66#define ARM_LPAE_PTE_TYPE_TABLE		3
  67#define ARM_LPAE_PTE_TYPE_PAGE		3
  68
  69#define ARM_LPAE_PTE_ADDR_MASK		GENMASK_ULL(47,12)
  70
  71#define ARM_LPAE_PTE_NSTABLE		(((arm_lpae_iopte)1) << 63)
  72#define ARM_LPAE_PTE_XN			(((arm_lpae_iopte)3) << 53)
  73#define ARM_LPAE_PTE_AF			(((arm_lpae_iopte)1) << 10)
  74#define ARM_LPAE_PTE_SH_NS		(((arm_lpae_iopte)0) << 8)
  75#define ARM_LPAE_PTE_SH_OS		(((arm_lpae_iopte)2) << 8)
  76#define ARM_LPAE_PTE_SH_IS		(((arm_lpae_iopte)3) << 8)
  77#define ARM_LPAE_PTE_NS			(((arm_lpae_iopte)1) << 5)
  78#define ARM_LPAE_PTE_VALID		(((arm_lpae_iopte)1) << 0)
  79
  80#define ARM_LPAE_PTE_ATTR_LO_MASK	(((arm_lpae_iopte)0x3ff) << 2)
  81/* Ignore the contiguous bit for block splitting */
  82#define ARM_LPAE_PTE_ATTR_HI_MASK	(((arm_lpae_iopte)6) << 52)
  83#define ARM_LPAE_PTE_ATTR_MASK		(ARM_LPAE_PTE_ATTR_LO_MASK |	\
  84					 ARM_LPAE_PTE_ATTR_HI_MASK)
  85/* Software bit for solving coherency races */
  86#define ARM_LPAE_PTE_SW_SYNC		(((arm_lpae_iopte)1) << 55)
  87
  88/* Stage-1 PTE */
  89#define ARM_LPAE_PTE_AP_UNPRIV		(((arm_lpae_iopte)1) << 6)
  90#define ARM_LPAE_PTE_AP_RDONLY		(((arm_lpae_iopte)2) << 6)
  91#define ARM_LPAE_PTE_ATTRINDX_SHIFT	2
  92#define ARM_LPAE_PTE_nG			(((arm_lpae_iopte)1) << 11)
  93
  94/* Stage-2 PTE */
  95#define ARM_LPAE_PTE_HAP_FAULT		(((arm_lpae_iopte)0) << 6)
  96#define ARM_LPAE_PTE_HAP_READ		(((arm_lpae_iopte)1) << 6)
  97#define ARM_LPAE_PTE_HAP_WRITE		(((arm_lpae_iopte)2) << 6)
  98#define ARM_LPAE_PTE_MEMATTR_OIWB	(((arm_lpae_iopte)0xf) << 2)
  99#define ARM_LPAE_PTE_MEMATTR_NC		(((arm_lpae_iopte)0x5) << 2)
 100#define ARM_LPAE_PTE_MEMATTR_DEV	(((arm_lpae_iopte)0x1) << 2)
 101
 102/* Register bits */
 103#define ARM_LPAE_TCR_TG0_4K		0
 104#define ARM_LPAE_TCR_TG0_64K		1
 105#define ARM_LPAE_TCR_TG0_16K		2
 106
 107#define ARM_LPAE_TCR_TG1_16K		1
 108#define ARM_LPAE_TCR_TG1_4K		2
 109#define ARM_LPAE_TCR_TG1_64K		3
 110
 
 
 
 
 
 
 111#define ARM_LPAE_TCR_SH_NS		0
 112#define ARM_LPAE_TCR_SH_OS		2
 113#define ARM_LPAE_TCR_SH_IS		3
 114
 
 
 
 115#define ARM_LPAE_TCR_RGN_NC		0
 116#define ARM_LPAE_TCR_RGN_WBWA		1
 117#define ARM_LPAE_TCR_RGN_WT		2
 118#define ARM_LPAE_TCR_RGN_WB		3
 119
 120#define ARM_LPAE_VTCR_SL0_MASK		0x3
 
 121
 122#define ARM_LPAE_TCR_T0SZ_SHIFT		0
 
 
 
 
 123
 124#define ARM_LPAE_VTCR_PS_SHIFT		16
 125#define ARM_LPAE_VTCR_PS_MASK		0x7
 126
 127#define ARM_LPAE_TCR_PS_32_BIT		0x0ULL
 128#define ARM_LPAE_TCR_PS_36_BIT		0x1ULL
 129#define ARM_LPAE_TCR_PS_40_BIT		0x2ULL
 130#define ARM_LPAE_TCR_PS_42_BIT		0x3ULL
 131#define ARM_LPAE_TCR_PS_44_BIT		0x4ULL
 132#define ARM_LPAE_TCR_PS_48_BIT		0x5ULL
 133#define ARM_LPAE_TCR_PS_52_BIT		0x6ULL
 134
 135#define ARM_LPAE_MAIR_ATTR_SHIFT(n)	((n) << 3)
 136#define ARM_LPAE_MAIR_ATTR_MASK		0xff
 137#define ARM_LPAE_MAIR_ATTR_DEVICE	0x04
 138#define ARM_LPAE_MAIR_ATTR_NC		0x44
 139#define ARM_LPAE_MAIR_ATTR_INC_OWBRWA	0xf4
 140#define ARM_LPAE_MAIR_ATTR_WBRWA	0xff
 141#define ARM_LPAE_MAIR_ATTR_IDX_NC	0
 142#define ARM_LPAE_MAIR_ATTR_IDX_CACHE	1
 143#define ARM_LPAE_MAIR_ATTR_IDX_DEV	2
 144#define ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE	3
 145
 146#define ARM_MALI_LPAE_TTBR_ADRMODE_TABLE (3u << 0)
 147#define ARM_MALI_LPAE_TTBR_READ_INNER	BIT(2)
 148#define ARM_MALI_LPAE_TTBR_SHARE_OUTER	BIT(4)
 149
 150#define ARM_MALI_LPAE_MEMATTR_IMP_DEF	0x88ULL
 151#define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
 152
 153/* IOPTE accessors */
 154#define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
 155
 156#define iopte_type(pte,l)					\
 157	(((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
 158
 159#define iopte_prot(pte)	((pte) & ARM_LPAE_PTE_ATTR_MASK)
 160
 161struct arm_lpae_io_pgtable {
 162	struct io_pgtable	iop;
 163
 164	int			pgd_bits;
 165	int			start_level;
 166	int			bits_per_level;
 
 167
 168	void			*pgd;
 169};
 170
 171typedef u64 arm_lpae_iopte;
 172
 173static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl,
 174			      enum io_pgtable_fmt fmt)
 175{
 176	if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE)
 177		return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_PAGE;
 178
 179	return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_BLOCK;
 180}
 181
 182static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
 183				     struct arm_lpae_io_pgtable *data)
 184{
 185	arm_lpae_iopte pte = paddr;
 186
 187	/* Of the bits which overlap, either 51:48 or 15:12 are always RES0 */
 188	return (pte | (pte >> (48 - 12))) & ARM_LPAE_PTE_ADDR_MASK;
 189}
 190
 191static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
 192				  struct arm_lpae_io_pgtable *data)
 193{
 194	u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
 195
 196	if (ARM_LPAE_GRANULE(data) < SZ_64K)
 197		return paddr;
 198
 199	/* Rotate the packed high-order bits back to the top */
 200	return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4);
 201}
 202
 203static bool selftest_running = false;
 204
 205static dma_addr_t __arm_lpae_dma_addr(void *pages)
 206{
 207	return (dma_addr_t)virt_to_phys(pages);
 208}
 209
 210static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
 211				    struct io_pgtable_cfg *cfg)
 212{
 213	struct device *dev = cfg->iommu_dev;
 214	int order = get_order(size);
 215	struct page *p;
 216	dma_addr_t dma;
 217	void *pages;
 218
 219	VM_BUG_ON((gfp & __GFP_HIGHMEM));
 220	p = alloc_pages_node(dev ? dev_to_node(dev) : NUMA_NO_NODE,
 221			     gfp | __GFP_ZERO, order);
 222	if (!p)
 223		return NULL;
 224
 225	pages = page_address(p);
 226	if (!cfg->coherent_walk) {
 227		dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
 228		if (dma_mapping_error(dev, dma))
 229			goto out_free;
 230		/*
 231		 * We depend on the IOMMU being able to work with any physical
 232		 * address directly, so if the DMA layer suggests otherwise by
 233		 * translating or truncating them, that bodes very badly...
 234		 */
 235		if (dma != virt_to_phys(pages))
 236			goto out_unmap;
 237	}
 238
 239	return pages;
 240
 241out_unmap:
 242	dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
 243	dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
 244out_free:
 245	__free_pages(p, order);
 246	return NULL;
 247}
 248
 249static void __arm_lpae_free_pages(void *pages, size_t size,
 250				  struct io_pgtable_cfg *cfg)
 251{
 252	if (!cfg->coherent_walk)
 253		dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
 254				 size, DMA_TO_DEVICE);
 255	free_pages((unsigned long)pages, get_order(size));
 256}
 257
 258static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep,
 259				struct io_pgtable_cfg *cfg)
 260{
 261	dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
 262				   sizeof(*ptep), DMA_TO_DEVICE);
 263}
 264
 265static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
 266			       struct io_pgtable_cfg *cfg)
 267{
 268	*ptep = pte;
 269
 270	if (!cfg->coherent_walk)
 271		__arm_lpae_sync_pte(ptep, cfg);
 272}
 273
 274static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 275			       struct iommu_iotlb_gather *gather,
 276			       unsigned long iova, size_t size, int lvl,
 277			       arm_lpae_iopte *ptep);
 278
 279static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
 280				phys_addr_t paddr, arm_lpae_iopte prot,
 281				int lvl, arm_lpae_iopte *ptep)
 282{
 283	arm_lpae_iopte pte = prot;
 284
 
 
 
 285	if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1)
 286		pte |= ARM_LPAE_PTE_TYPE_PAGE;
 287	else
 288		pte |= ARM_LPAE_PTE_TYPE_BLOCK;
 289
 
 
 
 290	pte |= paddr_to_iopte(paddr, data);
 291
 292	__arm_lpae_set_pte(ptep, pte, &data->iop.cfg);
 293}
 294
 295static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
 296			     unsigned long iova, phys_addr_t paddr,
 297			     arm_lpae_iopte prot, int lvl,
 298			     arm_lpae_iopte *ptep)
 299{
 300	arm_lpae_iopte pte = *ptep;
 301
 302	if (iopte_leaf(pte, lvl, data->iop.fmt)) {
 303		/* We require an unmap first */
 304		WARN_ON(!selftest_running);
 305		return -EEXIST;
 306	} else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
 307		/*
 308		 * We need to unmap and free the old table before
 309		 * overwriting it with a block entry.
 310		 */
 311		arm_lpae_iopte *tblp;
 312		size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
 313
 314		tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
 315		if (__arm_lpae_unmap(data, NULL, iova, sz, lvl, tblp) != sz) {
 316			WARN_ON(1);
 317			return -EINVAL;
 318		}
 319	}
 320
 321	__arm_lpae_init_pte(data, paddr, prot, lvl, ptep);
 322	return 0;
 323}
 324
 325static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
 326					     arm_lpae_iopte *ptep,
 327					     arm_lpae_iopte curr,
 328					     struct io_pgtable_cfg *cfg)
 329{
 330	arm_lpae_iopte old, new;
 331
 332	new = __pa(table) | ARM_LPAE_PTE_TYPE_TABLE;
 333	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
 334		new |= ARM_LPAE_PTE_NSTABLE;
 335
 336	/*
 337	 * Ensure the table itself is visible before its PTE can be.
 338	 * Whilst we could get away with cmpxchg64_release below, this
 339	 * doesn't have any ordering semantics when !CONFIG_SMP.
 340	 */
 341	dma_wmb();
 342
 343	old = cmpxchg64_relaxed(ptep, curr, new);
 344
 345	if (cfg->coherent_walk || (old & ARM_LPAE_PTE_SW_SYNC))
 346		return old;
 347
 348	/* Even if it's not ours, there's no point waiting; just kick it */
 349	__arm_lpae_sync_pte(ptep, cfg);
 350	if (old == curr)
 351		WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
 352
 353	return old;
 354}
 355
 356static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
 357			  phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
 358			  int lvl, arm_lpae_iopte *ptep, gfp_t gfp)
 359{
 360	arm_lpae_iopte *cptep, pte;
 361	size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
 362	size_t tblsz = ARM_LPAE_GRANULE(data);
 363	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 364
 365	/* Find our entry at the current level */
 366	ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 367
 368	/* If we can install a leaf entry at this level, then do so */
 369	if (size == block_size)
 370		return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
 371
 372	/* We can't allocate tables at the final level */
 373	if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
 374		return -EINVAL;
 375
 376	/* Grab a pointer to the next level */
 377	pte = READ_ONCE(*ptep);
 378	if (!pte) {
 379		cptep = __arm_lpae_alloc_pages(tblsz, gfp, cfg);
 380		if (!cptep)
 381			return -ENOMEM;
 382
 383		pte = arm_lpae_install_table(cptep, ptep, 0, cfg);
 384		if (pte)
 385			__arm_lpae_free_pages(cptep, tblsz, cfg);
 386	} else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
 387		__arm_lpae_sync_pte(ptep, cfg);
 388	}
 389
 390	if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) {
 391		cptep = iopte_deref(pte, data);
 392	} else if (pte) {
 393		/* We require an unmap first */
 394		WARN_ON(!selftest_running);
 395		return -EEXIST;
 396	}
 397
 398	/* Rinse, repeat */
 399	return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep, gfp);
 400}
 401
 402static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
 403					   int prot)
 404{
 405	arm_lpae_iopte pte;
 406
 407	if (data->iop.fmt == ARM_64_LPAE_S1 ||
 408	    data->iop.fmt == ARM_32_LPAE_S1) {
 409		pte = ARM_LPAE_PTE_nG;
 410		if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
 411			pte |= ARM_LPAE_PTE_AP_RDONLY;
 412		if (!(prot & IOMMU_PRIV))
 413			pte |= ARM_LPAE_PTE_AP_UNPRIV;
 414	} else {
 415		pte = ARM_LPAE_PTE_HAP_FAULT;
 416		if (prot & IOMMU_READ)
 417			pte |= ARM_LPAE_PTE_HAP_READ;
 418		if (prot & IOMMU_WRITE)
 419			pte |= ARM_LPAE_PTE_HAP_WRITE;
 420	}
 421
 422	/*
 423	 * Note that this logic is structured to accommodate Mali LPAE
 424	 * having stage-1-like attributes but stage-2-like permissions.
 425	 */
 426	if (data->iop.fmt == ARM_64_LPAE_S2 ||
 427	    data->iop.fmt == ARM_32_LPAE_S2) {
 428		if (prot & IOMMU_MMIO)
 429			pte |= ARM_LPAE_PTE_MEMATTR_DEV;
 430		else if (prot & IOMMU_CACHE)
 431			pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
 432		else
 433			pte |= ARM_LPAE_PTE_MEMATTR_NC;
 434	} else {
 435		if (prot & IOMMU_MMIO)
 436			pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
 437				<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
 438		else if (prot & IOMMU_CACHE)
 439			pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
 440				<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
 
 
 
 441	}
 442
 443	if (prot & IOMMU_CACHE)
 444		pte |= ARM_LPAE_PTE_SH_IS;
 445	else
 446		pte |= ARM_LPAE_PTE_SH_OS;
 447
 448	if (prot & IOMMU_NOEXEC)
 449		pte |= ARM_LPAE_PTE_XN;
 450
 451	if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
 452		pte |= ARM_LPAE_PTE_NS;
 453
 454	if (data->iop.fmt != ARM_MALI_LPAE)
 455		pte |= ARM_LPAE_PTE_AF;
 456
 457	return pte;
 458}
 459
 460static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
 461			phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
 462{
 463	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 464	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 465	arm_lpae_iopte *ptep = data->pgd;
 466	int ret, lvl = data->start_level;
 467	arm_lpae_iopte prot;
 468	long iaext = (s64)iova >> cfg->ias;
 469
 470	/* If no access, then nothing to do */
 471	if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
 472		return 0;
 473
 474	if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
 475		return -EINVAL;
 476
 477	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
 478		iaext = ~iaext;
 479	if (WARN_ON(iaext || paddr >> cfg->oas))
 480		return -ERANGE;
 481
 482	prot = arm_lpae_prot_to_pte(data, iommu_prot);
 483	ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep, gfp);
 484	/*
 485	 * Synchronise all PTE updates for the new mapping before there's
 486	 * a chance for anything to kick off a table walk for the new iova.
 487	 */
 488	wmb();
 489
 490	return ret;
 491}
 492
 493static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
 494				    arm_lpae_iopte *ptep)
 495{
 496	arm_lpae_iopte *start, *end;
 497	unsigned long table_size;
 498
 499	if (lvl == data->start_level)
 500		table_size = ARM_LPAE_PGD_SIZE(data);
 501	else
 502		table_size = ARM_LPAE_GRANULE(data);
 503
 504	start = ptep;
 505
 506	/* Only leaf entries at the last level */
 507	if (lvl == ARM_LPAE_MAX_LEVELS - 1)
 508		end = ptep;
 509	else
 510		end = (void *)ptep + table_size;
 511
 512	while (ptep != end) {
 513		arm_lpae_iopte pte = *ptep++;
 514
 515		if (!pte || iopte_leaf(pte, lvl, data->iop.fmt))
 516			continue;
 517
 518		__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
 519	}
 520
 521	__arm_lpae_free_pages(start, table_size, &data->iop.cfg);
 522}
 523
 524static void arm_lpae_free_pgtable(struct io_pgtable *iop)
 525{
 526	struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
 527
 528	__arm_lpae_free_pgtable(data, data->start_level, data->pgd);
 529	kfree(data);
 530}
 531
 532static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 533				       struct iommu_iotlb_gather *gather,
 534				       unsigned long iova, size_t size,
 535				       arm_lpae_iopte blk_pte, int lvl,
 536				       arm_lpae_iopte *ptep)
 537{
 538	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 539	arm_lpae_iopte pte, *tablep;
 540	phys_addr_t blk_paddr;
 541	size_t tablesz = ARM_LPAE_GRANULE(data);
 542	size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
 543	int i, unmap_idx = -1;
 544
 545	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
 546		return 0;
 547
 548	tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
 549	if (!tablep)
 550		return 0; /* Bytes unmapped */
 551
 552	if (size == split_sz)
 553		unmap_idx = ARM_LPAE_LVL_IDX(iova, lvl, data);
 554
 555	blk_paddr = iopte_to_paddr(blk_pte, data);
 556	pte = iopte_prot(blk_pte);
 557
 558	for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz) {
 559		/* Unmap! */
 560		if (i == unmap_idx)
 561			continue;
 562
 563		__arm_lpae_init_pte(data, blk_paddr, pte, lvl, &tablep[i]);
 564	}
 565
 566	pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg);
 567	if (pte != blk_pte) {
 568		__arm_lpae_free_pages(tablep, tablesz, cfg);
 569		/*
 570		 * We may race against someone unmapping another part of this
 571		 * block, but anything else is invalid. We can't misinterpret
 572		 * a page entry here since we're never at the last level.
 573		 */
 574		if (iopte_type(pte, lvl - 1) != ARM_LPAE_PTE_TYPE_TABLE)
 575			return 0;
 576
 577		tablep = iopte_deref(pte, data);
 578	} else if (unmap_idx >= 0) {
 579		io_pgtable_tlb_add_page(&data->iop, gather, iova, size);
 580		return size;
 581	}
 582
 583	return __arm_lpae_unmap(data, gather, iova, size, lvl, tablep);
 584}
 585
 586static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 587			       struct iommu_iotlb_gather *gather,
 588			       unsigned long iova, size_t size, int lvl,
 589			       arm_lpae_iopte *ptep)
 590{
 591	arm_lpae_iopte pte;
 592	struct io_pgtable *iop = &data->iop;
 593
 594	/* Something went horribly wrong and we ran out of page table */
 595	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
 596		return 0;
 597
 598	ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 599	pte = READ_ONCE(*ptep);
 600	if (WARN_ON(!pte))
 601		return 0;
 602
 603	/* If the size matches this level, we're in the right place */
 604	if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
 605		__arm_lpae_set_pte(ptep, 0, &iop->cfg);
 606
 607		if (!iopte_leaf(pte, lvl, iop->fmt)) {
 608			/* Also flush any partial walks */
 609			io_pgtable_tlb_flush_walk(iop, iova, size,
 610						  ARM_LPAE_GRANULE(data));
 611			ptep = iopte_deref(pte, data);
 612			__arm_lpae_free_pgtable(data, lvl + 1, ptep);
 613		} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
 614			/*
 615			 * Order the PTE update against queueing the IOVA, to
 616			 * guarantee that a flush callback from a different CPU
 617			 * has observed it before the TLBIALL can be issued.
 618			 */
 619			smp_wmb();
 620		} else {
 621			io_pgtable_tlb_add_page(iop, gather, iova, size);
 622		}
 623
 624		return size;
 625	} else if (iopte_leaf(pte, lvl, iop->fmt)) {
 626		/*
 627		 * Insert a table at the next level to map the old region,
 628		 * minus the part we want to unmap
 629		 */
 630		return arm_lpae_split_blk_unmap(data, gather, iova, size, pte,
 631						lvl + 1, ptep);
 632	}
 633
 634	/* Keep on walkin' */
 635	ptep = iopte_deref(pte, data);
 636	return __arm_lpae_unmap(data, gather, iova, size, lvl + 1, ptep);
 637}
 638
 639static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 640			     size_t size, struct iommu_iotlb_gather *gather)
 641{
 642	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 643	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 644	arm_lpae_iopte *ptep = data->pgd;
 645	long iaext = (s64)iova >> cfg->ias;
 646
 647	if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
 648		return 0;
 649
 650	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
 651		iaext = ~iaext;
 652	if (WARN_ON(iaext))
 653		return 0;
 654
 655	return __arm_lpae_unmap(data, gather, iova, size, data->start_level, ptep);
 656}
 657
 658static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
 659					 unsigned long iova)
 660{
 661	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 662	arm_lpae_iopte pte, *ptep = data->pgd;
 663	int lvl = data->start_level;
 664
 665	do {
 666		/* Valid IOPTE pointer? */
 667		if (!ptep)
 668			return 0;
 669
 670		/* Grab the IOPTE we're interested in */
 671		ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 672		pte = READ_ONCE(*ptep);
 673
 674		/* Valid entry? */
 675		if (!pte)
 676			return 0;
 677
 678		/* Leaf entry? */
 679		if (iopte_leaf(pte, lvl, data->iop.fmt))
 680			goto found_translation;
 681
 682		/* Take it to the next level */
 683		ptep = iopte_deref(pte, data);
 684	} while (++lvl < ARM_LPAE_MAX_LEVELS);
 685
 686	/* Ran out of page tables to walk */
 687	return 0;
 688
 689found_translation:
 690	iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
 691	return iopte_to_paddr(pte, data) | iova;
 692}
 693
 694static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
 695{
 696	unsigned long granule, page_sizes;
 697	unsigned int max_addr_bits = 48;
 698
 699	/*
 700	 * We need to restrict the supported page sizes to match the
 701	 * translation regime for a particular granule. Aim to match
 702	 * the CPU page size if possible, otherwise prefer smaller sizes.
 703	 * While we're at it, restrict the block sizes to match the
 704	 * chosen granule.
 705	 */
 706	if (cfg->pgsize_bitmap & PAGE_SIZE)
 707		granule = PAGE_SIZE;
 708	else if (cfg->pgsize_bitmap & ~PAGE_MASK)
 709		granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
 710	else if (cfg->pgsize_bitmap & PAGE_MASK)
 711		granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
 712	else
 713		granule = 0;
 714
 715	switch (granule) {
 716	case SZ_4K:
 717		page_sizes = (SZ_4K | SZ_2M | SZ_1G);
 718		break;
 719	case SZ_16K:
 720		page_sizes = (SZ_16K | SZ_32M);
 721		break;
 722	case SZ_64K:
 723		max_addr_bits = 52;
 724		page_sizes = (SZ_64K | SZ_512M);
 725		if (cfg->oas > 48)
 726			page_sizes |= 1ULL << 42; /* 4TB */
 727		break;
 728	default:
 729		page_sizes = 0;
 730	}
 731
 732	cfg->pgsize_bitmap &= page_sizes;
 733	cfg->ias = min(cfg->ias, max_addr_bits);
 734	cfg->oas = min(cfg->oas, max_addr_bits);
 735}
 736
 737static struct arm_lpae_io_pgtable *
 738arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
 739{
 
 740	struct arm_lpae_io_pgtable *data;
 741	int levels, va_bits, pg_shift;
 742
 743	arm_lpae_restrict_pgsizes(cfg);
 744
 745	if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
 746		return NULL;
 747
 748	if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
 749		return NULL;
 750
 751	if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
 752		return NULL;
 753
 754	if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) {
 755		dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n");
 756		return NULL;
 757	}
 758
 759	data = kmalloc(sizeof(*data), GFP_KERNEL);
 760	if (!data)
 761		return NULL;
 762
 763	pg_shift = __ffs(cfg->pgsize_bitmap);
 764	data->bits_per_level = pg_shift - ilog2(sizeof(arm_lpae_iopte));
 765
 766	va_bits = cfg->ias - pg_shift;
 767	levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
 768	data->start_level = ARM_LPAE_MAX_LEVELS - levels;
 769
 770	/* Calculate the actual size of our pgd (without concatenation) */
 771	data->pgd_bits = va_bits - (data->bits_per_level * (levels - 1));
 
 772
 773	data->iop.ops = (struct io_pgtable_ops) {
 774		.map		= arm_lpae_map,
 775		.unmap		= arm_lpae_unmap,
 776		.iova_to_phys	= arm_lpae_iova_to_phys,
 777	};
 778
 779	return data;
 780}
 781
 782static struct io_pgtable *
 783arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
 784{
 785	u64 reg;
 786	struct arm_lpae_io_pgtable *data;
 787	typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr;
 788	bool tg1;
 789
 790	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
 791			    IO_PGTABLE_QUIRK_NON_STRICT |
 792			    IO_PGTABLE_QUIRK_ARM_TTBR1))
 793		return NULL;
 794
 795	data = arm_lpae_alloc_pgtable(cfg);
 796	if (!data)
 797		return NULL;
 798
 799	/* TCR */
 800	if (cfg->coherent_walk) {
 801		tcr->sh = ARM_LPAE_TCR_SH_IS;
 802		tcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
 803		tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
 804	} else {
 805		tcr->sh = ARM_LPAE_TCR_SH_OS;
 806		tcr->irgn = ARM_LPAE_TCR_RGN_NC;
 807		tcr->orgn = ARM_LPAE_TCR_RGN_NC;
 808	}
 809
 810	tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1;
 811	switch (ARM_LPAE_GRANULE(data)) {
 812	case SZ_4K:
 813		tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K;
 814		break;
 815	case SZ_16K:
 816		tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K;
 817		break;
 818	case SZ_64K:
 819		tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K;
 820		break;
 821	}
 822
 823	switch (cfg->oas) {
 824	case 32:
 825		tcr->ips = ARM_LPAE_TCR_PS_32_BIT;
 826		break;
 827	case 36:
 828		tcr->ips = ARM_LPAE_TCR_PS_36_BIT;
 829		break;
 830	case 40:
 831		tcr->ips = ARM_LPAE_TCR_PS_40_BIT;
 832		break;
 833	case 42:
 834		tcr->ips = ARM_LPAE_TCR_PS_42_BIT;
 835		break;
 836	case 44:
 837		tcr->ips = ARM_LPAE_TCR_PS_44_BIT;
 838		break;
 839	case 48:
 840		tcr->ips = ARM_LPAE_TCR_PS_48_BIT;
 841		break;
 842	case 52:
 843		tcr->ips = ARM_LPAE_TCR_PS_52_BIT;
 844		break;
 845	default:
 846		goto out_free_data;
 847	}
 848
 849	tcr->tsz = 64ULL - cfg->ias;
 
 
 
 
 850
 851	/* MAIRs */
 852	reg = (ARM_LPAE_MAIR_ATTR_NC
 853	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
 854	      (ARM_LPAE_MAIR_ATTR_WBRWA
 855	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
 856	      (ARM_LPAE_MAIR_ATTR_DEVICE
 857	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)) |
 858	      (ARM_LPAE_MAIR_ATTR_INC_OWBRWA
 859	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE));
 860
 861	cfg->arm_lpae_s1_cfg.mair = reg;
 
 862
 863	/* Looking good; allocate a pgd */
 864	data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
 865					   GFP_KERNEL, cfg);
 866	if (!data->pgd)
 867		goto out_free_data;
 868
 869	/* Ensure the empty pgd is visible before any actual TTBR write */
 870	wmb();
 871
 872	/* TTBR */
 873	cfg->arm_lpae_s1_cfg.ttbr = virt_to_phys(data->pgd);
 
 874	return &data->iop;
 875
 876out_free_data:
 877	kfree(data);
 878	return NULL;
 879}
 880
 881static struct io_pgtable *
 882arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
 883{
 884	u64 sl;
 885	struct arm_lpae_io_pgtable *data;
 886	typeof(&cfg->arm_lpae_s2_cfg.vtcr) vtcr = &cfg->arm_lpae_s2_cfg.vtcr;
 887
 888	/* The NS quirk doesn't apply at stage 2 */
 889	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_NON_STRICT))
 890		return NULL;
 891
 892	data = arm_lpae_alloc_pgtable(cfg);
 893	if (!data)
 894		return NULL;
 895
 896	/*
 897	 * Concatenate PGDs at level 1 if possible in order to reduce
 898	 * the depth of the stage-2 walk.
 899	 */
 900	if (data->start_level == 0) {
 901		unsigned long pgd_pages;
 902
 903		pgd_pages = ARM_LPAE_PGD_SIZE(data) / sizeof(arm_lpae_iopte);
 904		if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
 905			data->pgd_bits += data->bits_per_level;
 906			data->start_level++;
 907		}
 908	}
 909
 910	/* VTCR */
 911	if (cfg->coherent_walk) {
 912		vtcr->sh = ARM_LPAE_TCR_SH_IS;
 913		vtcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
 914		vtcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
 915	} else {
 916		vtcr->sh = ARM_LPAE_TCR_SH_OS;
 917		vtcr->irgn = ARM_LPAE_TCR_RGN_NC;
 918		vtcr->orgn = ARM_LPAE_TCR_RGN_NC;
 919	}
 920
 921	sl = data->start_level;
 922
 923	switch (ARM_LPAE_GRANULE(data)) {
 924	case SZ_4K:
 925		vtcr->tg = ARM_LPAE_TCR_TG0_4K;
 926		sl++; /* SL0 format is different for 4K granule size */
 927		break;
 928	case SZ_16K:
 929		vtcr->tg = ARM_LPAE_TCR_TG0_16K;
 930		break;
 931	case SZ_64K:
 932		vtcr->tg = ARM_LPAE_TCR_TG0_64K;
 933		break;
 934	}
 935
 936	switch (cfg->oas) {
 937	case 32:
 938		vtcr->ps = ARM_LPAE_TCR_PS_32_BIT;
 939		break;
 940	case 36:
 941		vtcr->ps = ARM_LPAE_TCR_PS_36_BIT;
 942		break;
 943	case 40:
 944		vtcr->ps = ARM_LPAE_TCR_PS_40_BIT;
 945		break;
 946	case 42:
 947		vtcr->ps = ARM_LPAE_TCR_PS_42_BIT;
 948		break;
 949	case 44:
 950		vtcr->ps = ARM_LPAE_TCR_PS_44_BIT;
 951		break;
 952	case 48:
 953		vtcr->ps = ARM_LPAE_TCR_PS_48_BIT;
 954		break;
 955	case 52:
 956		vtcr->ps = ARM_LPAE_TCR_PS_52_BIT;
 957		break;
 958	default:
 959		goto out_free_data;
 960	}
 961
 962	vtcr->tsz = 64ULL - cfg->ias;
 963	vtcr->sl = ~sl & ARM_LPAE_VTCR_SL0_MASK;
 
 964
 965	/* Allocate pgd pages */
 966	data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
 967					   GFP_KERNEL, cfg);
 968	if (!data->pgd)
 969		goto out_free_data;
 970
 971	/* Ensure the empty pgd is visible before any actual TTBR write */
 972	wmb();
 973
 974	/* VTTBR */
 975	cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
 976	return &data->iop;
 977
 978out_free_data:
 979	kfree(data);
 980	return NULL;
 981}
 982
 983static struct io_pgtable *
 984arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
 985{
 
 
 986	if (cfg->ias > 32 || cfg->oas > 40)
 987		return NULL;
 988
 989	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
 990	return arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
 
 
 
 
 
 
 991}
 992
 993static struct io_pgtable *
 994arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
 995{
 
 
 996	if (cfg->ias > 40 || cfg->oas > 40)
 997		return NULL;
 998
 999	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1000	return arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
 
 
 
 
1001}
1002
1003static struct io_pgtable *
1004arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
1005{
1006	struct arm_lpae_io_pgtable *data;
1007
1008	/* No quirks for Mali (hopefully) */
1009	if (cfg->quirks)
1010		return NULL;
1011
1012	if (cfg->ias > 48 || cfg->oas > 40)
1013		return NULL;
1014
1015	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1016
1017	data = arm_lpae_alloc_pgtable(cfg);
1018	if (!data)
1019		return NULL;
1020
1021	/* Mali seems to need a full 4-level table regardless of IAS */
1022	if (data->start_level > 0) {
1023		data->start_level = 0;
1024		data->pgd_bits = 0;
1025	}
1026	/*
1027	 * MEMATTR: Mali has no actual notion of a non-cacheable type, so the
1028	 * best we can do is mimic the out-of-tree driver and hope that the
1029	 * "implementation-defined caching policy" is good enough. Similarly,
1030	 * we'll use it for the sake of a valid attribute for our 'device'
1031	 * index, although callers should never request that in practice.
1032	 */
1033	cfg->arm_mali_lpae_cfg.memattr =
1034		(ARM_MALI_LPAE_MEMATTR_IMP_DEF
1035		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
1036		(ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC
1037		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
1038		(ARM_MALI_LPAE_MEMATTR_IMP_DEF
1039		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
1040
1041	data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
1042					   cfg);
1043	if (!data->pgd)
1044		goto out_free_data;
1045
1046	/* Ensure the empty pgd is visible before TRANSTAB can be written */
1047	wmb();
1048
1049	cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
1050					  ARM_MALI_LPAE_TTBR_READ_INNER |
1051					  ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
1052	return &data->iop;
1053
1054out_free_data:
1055	kfree(data);
1056	return NULL;
1057}
1058
1059struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
1060	.alloc	= arm_64_lpae_alloc_pgtable_s1,
1061	.free	= arm_lpae_free_pgtable,
1062};
1063
1064struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
1065	.alloc	= arm_64_lpae_alloc_pgtable_s2,
1066	.free	= arm_lpae_free_pgtable,
1067};
1068
1069struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
1070	.alloc	= arm_32_lpae_alloc_pgtable_s1,
1071	.free	= arm_lpae_free_pgtable,
1072};
1073
1074struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
1075	.alloc	= arm_32_lpae_alloc_pgtable_s2,
1076	.free	= arm_lpae_free_pgtable,
1077};
1078
1079struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = {
1080	.alloc	= arm_mali_lpae_alloc_pgtable,
1081	.free	= arm_lpae_free_pgtable,
1082};
1083
1084#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
1085
1086static struct io_pgtable_cfg *cfg_cookie __initdata;
1087
1088static void __init dummy_tlb_flush_all(void *cookie)
1089{
1090	WARN_ON(cookie != cfg_cookie);
1091}
1092
1093static void __init dummy_tlb_flush(unsigned long iova, size_t size,
1094				   size_t granule, void *cookie)
1095{
1096	WARN_ON(cookie != cfg_cookie);
1097	WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
1098}
1099
1100static void __init dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
1101				      unsigned long iova, size_t granule,
1102				      void *cookie)
1103{
1104	dummy_tlb_flush(iova, granule, granule, cookie);
1105}
1106
1107static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
1108	.tlb_flush_all	= dummy_tlb_flush_all,
1109	.tlb_flush_walk	= dummy_tlb_flush,
1110	.tlb_flush_leaf	= dummy_tlb_flush,
1111	.tlb_add_page	= dummy_tlb_add_page,
1112};
1113
1114static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
1115{
1116	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
1117	struct io_pgtable_cfg *cfg = &data->iop.cfg;
1118
1119	pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
1120		cfg->pgsize_bitmap, cfg->ias);
1121	pr_err("data: %d levels, 0x%zx pgd_size, %u pg_shift, %u bits_per_level, pgd @ %p\n",
1122		ARM_LPAE_MAX_LEVELS - data->start_level, ARM_LPAE_PGD_SIZE(data),
1123		ilog2(ARM_LPAE_GRANULE(data)), data->bits_per_level, data->pgd);
1124}
1125
1126#define __FAIL(ops, i)	({						\
1127		WARN(1, "selftest: test failed for fmt idx %d\n", (i));	\
1128		arm_lpae_dump_ops(ops);					\
1129		selftest_running = false;				\
1130		-EFAULT;						\
1131})
1132
1133static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
1134{
1135	static const enum io_pgtable_fmt fmts[] __initconst = {
1136		ARM_64_LPAE_S1,
1137		ARM_64_LPAE_S2,
1138	};
1139
1140	int i, j;
1141	unsigned long iova;
1142	size_t size;
1143	struct io_pgtable_ops *ops;
1144
1145	selftest_running = true;
1146
1147	for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
1148		cfg_cookie = cfg;
1149		ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
1150		if (!ops) {
1151			pr_err("selftest: failed to allocate io pgtable ops\n");
1152			return -ENOMEM;
1153		}
1154
1155		/*
1156		 * Initial sanity checks.
1157		 * Empty page tables shouldn't provide any translations.
1158		 */
1159		if (ops->iova_to_phys(ops, 42))
1160			return __FAIL(ops, i);
1161
1162		if (ops->iova_to_phys(ops, SZ_1G + 42))
1163			return __FAIL(ops, i);
1164
1165		if (ops->iova_to_phys(ops, SZ_2G + 42))
1166			return __FAIL(ops, i);
1167
1168		/*
1169		 * Distinct mappings of different granule sizes.
1170		 */
1171		iova = 0;
1172		for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1173			size = 1UL << j;
1174
1175			if (ops->map(ops, iova, iova, size, IOMMU_READ |
1176							    IOMMU_WRITE |
1177							    IOMMU_NOEXEC |
1178							    IOMMU_CACHE, GFP_KERNEL))
1179				return __FAIL(ops, i);
1180
1181			/* Overlapping mappings */
1182			if (!ops->map(ops, iova, iova + size, size,
1183				      IOMMU_READ | IOMMU_NOEXEC, GFP_KERNEL))
1184				return __FAIL(ops, i);
1185
1186			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1187				return __FAIL(ops, i);
1188
1189			iova += SZ_1G;
1190		}
1191
1192		/* Partial unmap */
1193		size = 1UL << __ffs(cfg->pgsize_bitmap);
1194		if (ops->unmap(ops, SZ_1G + size, size, NULL) != size)
1195			return __FAIL(ops, i);
1196
1197		/* Remap of partial unmap */
1198		if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ, GFP_KERNEL))
1199			return __FAIL(ops, i);
1200
1201		if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
1202			return __FAIL(ops, i);
1203
1204		/* Full unmap */
1205		iova = 0;
1206		for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1207			size = 1UL << j;
1208
1209			if (ops->unmap(ops, iova, size, NULL) != size)
1210				return __FAIL(ops, i);
1211
1212			if (ops->iova_to_phys(ops, iova + 42))
1213				return __FAIL(ops, i);
1214
1215			/* Remap full block */
1216			if (ops->map(ops, iova, iova, size, IOMMU_WRITE, GFP_KERNEL))
1217				return __FAIL(ops, i);
1218
1219			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1220				return __FAIL(ops, i);
1221
1222			iova += SZ_1G;
1223		}
1224
1225		free_io_pgtable_ops(ops);
1226	}
1227
1228	selftest_running = false;
1229	return 0;
1230}
1231
1232static int __init arm_lpae_do_selftests(void)
1233{
1234	static const unsigned long pgsize[] __initconst = {
1235		SZ_4K | SZ_2M | SZ_1G,
1236		SZ_16K | SZ_32M,
1237		SZ_64K | SZ_512M,
1238	};
1239
1240	static const unsigned int ias[] __initconst = {
1241		32, 36, 40, 42, 44, 48,
1242	};
1243
1244	int i, j, pass = 0, fail = 0;
1245	struct io_pgtable_cfg cfg = {
1246		.tlb = &dummy_tlb_ops,
1247		.oas = 48,
1248		.coherent_walk = true,
1249	};
1250
1251	for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
1252		for (j = 0; j < ARRAY_SIZE(ias); ++j) {
1253			cfg.pgsize_bitmap = pgsize[i];
1254			cfg.ias = ias[j];
1255			pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
1256				pgsize[i], ias[j]);
1257			if (arm_lpae_run_tests(&cfg))
1258				fail++;
1259			else
1260				pass++;
1261		}
1262	}
1263
1264	pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
1265	return fail ? -EFAULT : 0;
1266}
1267subsys_initcall(arm_lpae_do_selftests);
1268#endif
v5.4
   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#define ARM_LPAE_MAX_ADDR_BITS		52
  24#define ARM_LPAE_S2_MAX_CONCAT_PAGES	16
  25#define ARM_LPAE_MAX_LEVELS		4
  26
  27/* Struct accessors */
  28#define io_pgtable_to_data(x)						\
  29	container_of((x), struct arm_lpae_io_pgtable, iop)
  30
  31#define io_pgtable_ops_to_data(x)					\
  32	io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
  33
  34/*
  35 * For consistency with the architecture, we always consider
  36 * ARM_LPAE_MAX_LEVELS levels, with the walk starting at level n >=0
  37 */
  38#define ARM_LPAE_START_LVL(d)		(ARM_LPAE_MAX_LEVELS - (d)->levels)
  39
  40/*
  41 * Calculate the right shift amount to get to the portion describing level l
  42 * in a virtual address mapped by the pagetable in d.
  43 */
  44#define ARM_LPAE_LVL_SHIFT(l,d)						\
  45	((((d)->levels - ((l) - ARM_LPAE_START_LVL(d) + 1))		\
  46	  * (d)->bits_per_level) + (d)->pg_shift)
  47
  48#define ARM_LPAE_GRANULE(d)		(1UL << (d)->pg_shift)
  49
  50#define ARM_LPAE_PAGES_PER_PGD(d)					\
  51	DIV_ROUND_UP((d)->pgd_size, ARM_LPAE_GRANULE(d))
  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) == ARM_LPAE_START_LVL(d) ? ilog2(ARM_LPAE_PAGES_PER_PGD(d)) : 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)					\
  66	(1ULL << (ilog2(sizeof(arm_lpae_iopte)) +			\
  67		((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level)))
  68
  69/* Page table bits */
  70#define ARM_LPAE_PTE_TYPE_SHIFT		0
  71#define ARM_LPAE_PTE_TYPE_MASK		0x3
  72
  73#define ARM_LPAE_PTE_TYPE_BLOCK		1
  74#define ARM_LPAE_PTE_TYPE_TABLE		3
  75#define ARM_LPAE_PTE_TYPE_PAGE		3
  76
  77#define ARM_LPAE_PTE_ADDR_MASK		GENMASK_ULL(47,12)
  78
  79#define ARM_LPAE_PTE_NSTABLE		(((arm_lpae_iopte)1) << 63)
  80#define ARM_LPAE_PTE_XN			(((arm_lpae_iopte)3) << 53)
  81#define ARM_LPAE_PTE_AF			(((arm_lpae_iopte)1) << 10)
  82#define ARM_LPAE_PTE_SH_NS		(((arm_lpae_iopte)0) << 8)
  83#define ARM_LPAE_PTE_SH_OS		(((arm_lpae_iopte)2) << 8)
  84#define ARM_LPAE_PTE_SH_IS		(((arm_lpae_iopte)3) << 8)
  85#define ARM_LPAE_PTE_NS			(((arm_lpae_iopte)1) << 5)
  86#define ARM_LPAE_PTE_VALID		(((arm_lpae_iopte)1) << 0)
  87
  88#define ARM_LPAE_PTE_ATTR_LO_MASK	(((arm_lpae_iopte)0x3ff) << 2)
  89/* Ignore the contiguous bit for block splitting */
  90#define ARM_LPAE_PTE_ATTR_HI_MASK	(((arm_lpae_iopte)6) << 52)
  91#define ARM_LPAE_PTE_ATTR_MASK		(ARM_LPAE_PTE_ATTR_LO_MASK |	\
  92					 ARM_LPAE_PTE_ATTR_HI_MASK)
  93/* Software bit for solving coherency races */
  94#define ARM_LPAE_PTE_SW_SYNC		(((arm_lpae_iopte)1) << 55)
  95
  96/* Stage-1 PTE */
  97#define ARM_LPAE_PTE_AP_UNPRIV		(((arm_lpae_iopte)1) << 6)
  98#define ARM_LPAE_PTE_AP_RDONLY		(((arm_lpae_iopte)2) << 6)
  99#define ARM_LPAE_PTE_ATTRINDX_SHIFT	2
 100#define ARM_LPAE_PTE_nG			(((arm_lpae_iopte)1) << 11)
 101
 102/* Stage-2 PTE */
 103#define ARM_LPAE_PTE_HAP_FAULT		(((arm_lpae_iopte)0) << 6)
 104#define ARM_LPAE_PTE_HAP_READ		(((arm_lpae_iopte)1) << 6)
 105#define ARM_LPAE_PTE_HAP_WRITE		(((arm_lpae_iopte)2) << 6)
 106#define ARM_LPAE_PTE_MEMATTR_OIWB	(((arm_lpae_iopte)0xf) << 2)
 107#define ARM_LPAE_PTE_MEMATTR_NC		(((arm_lpae_iopte)0x5) << 2)
 108#define ARM_LPAE_PTE_MEMATTR_DEV	(((arm_lpae_iopte)0x1) << 2)
 109
 110/* Register bits */
 111#define ARM_32_LPAE_TCR_EAE		(1 << 31)
 112#define ARM_64_LPAE_S2_TCR_RES1		(1 << 31)
 113
 114#define ARM_LPAE_TCR_EPD1		(1 << 23)
 
 
 
 115
 116#define ARM_LPAE_TCR_TG0_4K		(0 << 14)
 117#define ARM_LPAE_TCR_TG0_64K		(1 << 14)
 118#define ARM_LPAE_TCR_TG0_16K		(2 << 14)
 119
 120#define ARM_LPAE_TCR_SH0_SHIFT		12
 121#define ARM_LPAE_TCR_SH0_MASK		0x3
 122#define ARM_LPAE_TCR_SH_NS		0
 123#define ARM_LPAE_TCR_SH_OS		2
 124#define ARM_LPAE_TCR_SH_IS		3
 125
 126#define ARM_LPAE_TCR_ORGN0_SHIFT	10
 127#define ARM_LPAE_TCR_IRGN0_SHIFT	8
 128#define ARM_LPAE_TCR_RGN_MASK		0x3
 129#define ARM_LPAE_TCR_RGN_NC		0
 130#define ARM_LPAE_TCR_RGN_WBWA		1
 131#define ARM_LPAE_TCR_RGN_WT		2
 132#define ARM_LPAE_TCR_RGN_WB		3
 133
 134#define ARM_LPAE_TCR_SL0_SHIFT		6
 135#define ARM_LPAE_TCR_SL0_MASK		0x3
 136
 137#define ARM_LPAE_TCR_T0SZ_SHIFT		0
 138#define ARM_LPAE_TCR_SZ_MASK		0xf
 139
 140#define ARM_LPAE_TCR_PS_SHIFT		16
 141#define ARM_LPAE_TCR_PS_MASK		0x7
 142
 143#define ARM_LPAE_TCR_IPS_SHIFT		32
 144#define ARM_LPAE_TCR_IPS_MASK		0x7
 145
 146#define ARM_LPAE_TCR_PS_32_BIT		0x0ULL
 147#define ARM_LPAE_TCR_PS_36_BIT		0x1ULL
 148#define ARM_LPAE_TCR_PS_40_BIT		0x2ULL
 149#define ARM_LPAE_TCR_PS_42_BIT		0x3ULL
 150#define ARM_LPAE_TCR_PS_44_BIT		0x4ULL
 151#define ARM_LPAE_TCR_PS_48_BIT		0x5ULL
 152#define ARM_LPAE_TCR_PS_52_BIT		0x6ULL
 153
 154#define ARM_LPAE_MAIR_ATTR_SHIFT(n)	((n) << 3)
 155#define ARM_LPAE_MAIR_ATTR_MASK		0xff
 156#define ARM_LPAE_MAIR_ATTR_DEVICE	0x04
 157#define ARM_LPAE_MAIR_ATTR_NC		0x44
 158#define ARM_LPAE_MAIR_ATTR_INC_OWBRWA	0xf4
 159#define ARM_LPAE_MAIR_ATTR_WBRWA	0xff
 160#define ARM_LPAE_MAIR_ATTR_IDX_NC	0
 161#define ARM_LPAE_MAIR_ATTR_IDX_CACHE	1
 162#define ARM_LPAE_MAIR_ATTR_IDX_DEV	2
 163#define ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE	3
 164
 165#define ARM_MALI_LPAE_TTBR_ADRMODE_TABLE (3u << 0)
 166#define ARM_MALI_LPAE_TTBR_READ_INNER	BIT(2)
 167#define ARM_MALI_LPAE_TTBR_SHARE_OUTER	BIT(4)
 168
 169#define ARM_MALI_LPAE_MEMATTR_IMP_DEF	0x88ULL
 170#define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
 171
 172/* IOPTE accessors */
 173#define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
 174
 175#define iopte_type(pte,l)					\
 176	(((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
 177
 178#define iopte_prot(pte)	((pte) & ARM_LPAE_PTE_ATTR_MASK)
 179
 180struct arm_lpae_io_pgtable {
 181	struct io_pgtable	iop;
 182
 183	int			levels;
 184	size_t			pgd_size;
 185	unsigned long		pg_shift;
 186	unsigned long		bits_per_level;
 187
 188	void			*pgd;
 189};
 190
 191typedef u64 arm_lpae_iopte;
 192
 193static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl,
 194			      enum io_pgtable_fmt fmt)
 195{
 196	if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE)
 197		return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_PAGE;
 198
 199	return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_BLOCK;
 200}
 201
 202static 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
 211static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
 212				  struct arm_lpae_io_pgtable *data)
 213{
 214	u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
 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
 223static bool selftest_running = false;
 224
 225static dma_addr_t __arm_lpae_dma_addr(void *pages)
 226{
 227	return (dma_addr_t)virt_to_phys(pages);
 228}
 229
 230static 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;
 234	int order = get_order(size);
 235	struct page *p;
 236	dma_addr_t dma;
 237	void *pages;
 238
 239	VM_BUG_ON((gfp & __GFP_HIGHMEM));
 240	p = alloc_pages_node(dev ? dev_to_node(dev) : NUMA_NO_NODE,
 241			     gfp | __GFP_ZERO, order);
 242	if (!p)
 243		return NULL;
 244
 245	pages = page_address(p);
 246	if (!cfg->coherent_walk) {
 247		dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
 248		if (dma_mapping_error(dev, dma))
 249			goto out_free;
 250		/*
 251		 * We depend on the IOMMU being able to work with any physical
 252		 * address directly, so if the DMA layer suggests otherwise by
 253		 * translating or truncating them, that bodes very badly...
 254		 */
 255		if (dma != virt_to_phys(pages))
 256			goto out_unmap;
 257	}
 258
 259	return pages;
 260
 261out_unmap:
 262	dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
 263	dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
 264out_free:
 265	__free_pages(p, order);
 266	return NULL;
 267}
 268
 269static void __arm_lpae_free_pages(void *pages, size_t size,
 270				  struct io_pgtable_cfg *cfg)
 271{
 272	if (!cfg->coherent_walk)
 273		dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
 274				 size, DMA_TO_DEVICE);
 275	free_pages((unsigned long)pages, get_order(size));
 276}
 277
 278static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep,
 279				struct io_pgtable_cfg *cfg)
 280{
 281	dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
 282				   sizeof(*ptep), DMA_TO_DEVICE);
 283}
 284
 285static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
 286			       struct io_pgtable_cfg *cfg)
 287{
 288	*ptep = pte;
 289
 290	if (!cfg->coherent_walk)
 291		__arm_lpae_sync_pte(ptep, cfg);
 292}
 293
 294static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 295			       struct iommu_iotlb_gather *gather,
 296			       unsigned long iova, size_t size, int lvl,
 297			       arm_lpae_iopte *ptep);
 298
 299static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
 300				phys_addr_t paddr, arm_lpae_iopte prot,
 301				int lvl, arm_lpae_iopte *ptep)
 302{
 303	arm_lpae_iopte pte = prot;
 304
 305	if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
 306		pte |= ARM_LPAE_PTE_NS;
 307
 308	if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1)
 309		pte |= ARM_LPAE_PTE_TYPE_PAGE;
 310	else
 311		pte |= ARM_LPAE_PTE_TYPE_BLOCK;
 312
 313	if (data->iop.fmt != ARM_MALI_LPAE)
 314		pte |= ARM_LPAE_PTE_AF;
 315	pte |= ARM_LPAE_PTE_SH_IS;
 316	pte |= paddr_to_iopte(paddr, data);
 317
 318	__arm_lpae_set_pte(ptep, pte, &data->iop.cfg);
 319}
 320
 321static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
 322			     unsigned long iova, phys_addr_t paddr,
 323			     arm_lpae_iopte prot, int lvl,
 324			     arm_lpae_iopte *ptep)
 325{
 326	arm_lpae_iopte pte = *ptep;
 327
 328	if (iopte_leaf(pte, lvl, data->iop.fmt)) {
 329		/* We require an unmap first */
 330		WARN_ON(!selftest_running);
 331		return -EEXIST;
 332	} else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
 333		/*
 334		 * We need to unmap and free the old table before
 335		 * overwriting it with a block entry.
 336		 */
 337		arm_lpae_iopte *tblp;
 338		size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
 339
 340		tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
 341		if (__arm_lpae_unmap(data, NULL, iova, sz, lvl, tblp) != sz) {
 342			WARN_ON(1);
 343			return -EINVAL;
 344		}
 345	}
 346
 347	__arm_lpae_init_pte(data, paddr, prot, lvl, ptep);
 348	return 0;
 349}
 350
 351static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
 352					     arm_lpae_iopte *ptep,
 353					     arm_lpae_iopte curr,
 354					     struct io_pgtable_cfg *cfg)
 355{
 356	arm_lpae_iopte old, new;
 357
 358	new = __pa(table) | ARM_LPAE_PTE_TYPE_TABLE;
 359	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
 360		new |= ARM_LPAE_PTE_NSTABLE;
 361
 362	/*
 363	 * Ensure the table itself is visible before its PTE can be.
 364	 * Whilst we could get away with cmpxchg64_release below, this
 365	 * doesn't have any ordering semantics when !CONFIG_SMP.
 366	 */
 367	dma_wmb();
 368
 369	old = cmpxchg64_relaxed(ptep, curr, new);
 370
 371	if (cfg->coherent_walk || (old & ARM_LPAE_PTE_SW_SYNC))
 372		return old;
 373
 374	/* Even if it's not ours, there's no point waiting; just kick it */
 375	__arm_lpae_sync_pte(ptep, cfg);
 376	if (old == curr)
 377		WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
 378
 379	return old;
 380}
 381
 382static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
 383			  phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
 384			  int lvl, arm_lpae_iopte *ptep)
 385{
 386	arm_lpae_iopte *cptep, pte;
 387	size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
 388	size_t tblsz = ARM_LPAE_GRANULE(data);
 389	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 390
 391	/* Find our entry at the current level */
 392	ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 393
 394	/* If we can install a leaf entry at this level, then do so */
 395	if (size == block_size && (size & cfg->pgsize_bitmap))
 396		return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
 397
 398	/* We can't allocate tables at the final level */
 399	if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
 400		return -EINVAL;
 401
 402	/* Grab a pointer to the next level */
 403	pte = READ_ONCE(*ptep);
 404	if (!pte) {
 405		cptep = __arm_lpae_alloc_pages(tblsz, GFP_ATOMIC, cfg);
 406		if (!cptep)
 407			return -ENOMEM;
 408
 409		pte = arm_lpae_install_table(cptep, ptep, 0, cfg);
 410		if (pte)
 411			__arm_lpae_free_pages(cptep, tblsz, cfg);
 412	} else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
 413		__arm_lpae_sync_pte(ptep, cfg);
 414	}
 415
 416	if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) {
 417		cptep = iopte_deref(pte, data);
 418	} else if (pte) {
 419		/* We require an unmap first */
 420		WARN_ON(!selftest_running);
 421		return -EEXIST;
 422	}
 423
 424	/* Rinse, repeat */
 425	return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep);
 426}
 427
 428static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
 429					   int prot)
 430{
 431	arm_lpae_iopte pte;
 432
 433	if (data->iop.fmt == ARM_64_LPAE_S1 ||
 434	    data->iop.fmt == ARM_32_LPAE_S1) {
 435		pte = ARM_LPAE_PTE_nG;
 436		if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
 437			pte |= ARM_LPAE_PTE_AP_RDONLY;
 438		if (!(prot & IOMMU_PRIV))
 439			pte |= ARM_LPAE_PTE_AP_UNPRIV;
 440	} else {
 441		pte = ARM_LPAE_PTE_HAP_FAULT;
 442		if (prot & IOMMU_READ)
 443			pte |= ARM_LPAE_PTE_HAP_READ;
 444		if (prot & IOMMU_WRITE)
 445			pte |= ARM_LPAE_PTE_HAP_WRITE;
 446	}
 447
 448	/*
 449	 * Note that this logic is structured to accommodate Mali LPAE
 450	 * having stage-1-like attributes but stage-2-like permissions.
 451	 */
 452	if (data->iop.fmt == ARM_64_LPAE_S2 ||
 453	    data->iop.fmt == ARM_32_LPAE_S2) {
 454		if (prot & IOMMU_MMIO)
 455			pte |= ARM_LPAE_PTE_MEMATTR_DEV;
 456		else if (prot & IOMMU_CACHE)
 457			pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
 458		else
 459			pte |= ARM_LPAE_PTE_MEMATTR_NC;
 460	} else {
 461		if (prot & IOMMU_MMIO)
 462			pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
 463				<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
 464		else if (prot & IOMMU_CACHE)
 465			pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
 466				<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
 467		else if (prot & IOMMU_QCOM_SYS_CACHE)
 468			pte |= (ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE
 469				<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
 470	}
 471
 
 
 
 
 
 472	if (prot & IOMMU_NOEXEC)
 473		pte |= ARM_LPAE_PTE_XN;
 474
 
 
 
 
 
 
 475	return pte;
 476}
 477
 478static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
 479			phys_addr_t paddr, size_t size, int iommu_prot)
 480{
 481	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 
 482	arm_lpae_iopte *ptep = data->pgd;
 483	int ret, lvl = ARM_LPAE_START_LVL(data);
 484	arm_lpae_iopte prot;
 
 485
 486	/* If no access, then nothing to do */
 487	if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
 488		return 0;
 489
 490	if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
 491		    paddr >= (1ULL << data->iop.cfg.oas)))
 
 
 
 
 492		return -ERANGE;
 493
 494	prot = arm_lpae_prot_to_pte(data, iommu_prot);
 495	ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
 496	/*
 497	 * Synchronise all PTE updates for the new mapping before there's
 498	 * a chance for anything to kick off a table walk for the new iova.
 499	 */
 500	wmb();
 501
 502	return ret;
 503}
 504
 505static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
 506				    arm_lpae_iopte *ptep)
 507{
 508	arm_lpae_iopte *start, *end;
 509	unsigned long table_size;
 510
 511	if (lvl == ARM_LPAE_START_LVL(data))
 512		table_size = data->pgd_size;
 513	else
 514		table_size = ARM_LPAE_GRANULE(data);
 515
 516	start = ptep;
 517
 518	/* Only leaf entries at the last level */
 519	if (lvl == ARM_LPAE_MAX_LEVELS - 1)
 520		end = ptep;
 521	else
 522		end = (void *)ptep + table_size;
 523
 524	while (ptep != end) {
 525		arm_lpae_iopte pte = *ptep++;
 526
 527		if (!pte || iopte_leaf(pte, lvl, data->iop.fmt))
 528			continue;
 529
 530		__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
 531	}
 532
 533	__arm_lpae_free_pages(start, table_size, &data->iop.cfg);
 534}
 535
 536static void arm_lpae_free_pgtable(struct io_pgtable *iop)
 537{
 538	struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
 539
 540	__arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd);
 541	kfree(data);
 542}
 543
 544static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 545				       struct iommu_iotlb_gather *gather,
 546				       unsigned long iova, size_t size,
 547				       arm_lpae_iopte blk_pte, int lvl,
 548				       arm_lpae_iopte *ptep)
 549{
 550	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 551	arm_lpae_iopte pte, *tablep;
 552	phys_addr_t blk_paddr;
 553	size_t tablesz = ARM_LPAE_GRANULE(data);
 554	size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
 555	int i, unmap_idx = -1;
 556
 557	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
 558		return 0;
 559
 560	tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
 561	if (!tablep)
 562		return 0; /* Bytes unmapped */
 563
 564	if (size == split_sz)
 565		unmap_idx = ARM_LPAE_LVL_IDX(iova, lvl, data);
 566
 567	blk_paddr = iopte_to_paddr(blk_pte, data);
 568	pte = iopte_prot(blk_pte);
 569
 570	for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz) {
 571		/* Unmap! */
 572		if (i == unmap_idx)
 573			continue;
 574
 575		__arm_lpae_init_pte(data, blk_paddr, pte, lvl, &tablep[i]);
 576	}
 577
 578	pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg);
 579	if (pte != blk_pte) {
 580		__arm_lpae_free_pages(tablep, tablesz, cfg);
 581		/*
 582		 * We may race against someone unmapping another part of this
 583		 * block, but anything else is invalid. We can't misinterpret
 584		 * a page entry here since we're never at the last level.
 585		 */
 586		if (iopte_type(pte, lvl - 1) != ARM_LPAE_PTE_TYPE_TABLE)
 587			return 0;
 588
 589		tablep = iopte_deref(pte, data);
 590	} else if (unmap_idx >= 0) {
 591		io_pgtable_tlb_add_page(&data->iop, gather, iova, size);
 592		return size;
 593	}
 594
 595	return __arm_lpae_unmap(data, gather, iova, size, lvl, tablep);
 596}
 597
 598static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 599			       struct iommu_iotlb_gather *gather,
 600			       unsigned long iova, size_t size, int lvl,
 601			       arm_lpae_iopte *ptep)
 602{
 603	arm_lpae_iopte pte;
 604	struct io_pgtable *iop = &data->iop;
 605
 606	/* Something went horribly wrong and we ran out of page table */
 607	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
 608		return 0;
 609
 610	ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 611	pte = READ_ONCE(*ptep);
 612	if (WARN_ON(!pte))
 613		return 0;
 614
 615	/* If the size matches this level, we're in the right place */
 616	if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
 617		__arm_lpae_set_pte(ptep, 0, &iop->cfg);
 618
 619		if (!iopte_leaf(pte, lvl, iop->fmt)) {
 620			/* Also flush any partial walks */
 621			io_pgtable_tlb_flush_walk(iop, iova, size,
 622						  ARM_LPAE_GRANULE(data));
 623			ptep = iopte_deref(pte, data);
 624			__arm_lpae_free_pgtable(data, lvl + 1, ptep);
 625		} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
 626			/*
 627			 * Order the PTE update against queueing the IOVA, to
 628			 * guarantee that a flush callback from a different CPU
 629			 * has observed it before the TLBIALL can be issued.
 630			 */
 631			smp_wmb();
 632		} else {
 633			io_pgtable_tlb_add_page(iop, gather, iova, size);
 634		}
 635
 636		return size;
 637	} else if (iopte_leaf(pte, lvl, iop->fmt)) {
 638		/*
 639		 * Insert a table at the next level to map the old region,
 640		 * minus the part we want to unmap
 641		 */
 642		return arm_lpae_split_blk_unmap(data, gather, iova, size, pte,
 643						lvl + 1, ptep);
 644	}
 645
 646	/* Keep on walkin' */
 647	ptep = iopte_deref(pte, data);
 648	return __arm_lpae_unmap(data, gather, iova, size, lvl + 1, ptep);
 649}
 650
 651static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 652			     size_t size, struct iommu_iotlb_gather *gather)
 653{
 654	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 
 655	arm_lpae_iopte *ptep = data->pgd;
 656	int lvl = ARM_LPAE_START_LVL(data);
 
 
 
 657
 658	if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias)))
 
 
 659		return 0;
 660
 661	return __arm_lpae_unmap(data, gather, iova, size, lvl, ptep);
 662}
 663
 664static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
 665					 unsigned long iova)
 666{
 667	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 668	arm_lpae_iopte pte, *ptep = data->pgd;
 669	int lvl = ARM_LPAE_START_LVL(data);
 670
 671	do {
 672		/* Valid IOPTE pointer? */
 673		if (!ptep)
 674			return 0;
 675
 676		/* Grab the IOPTE we're interested in */
 677		ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
 678		pte = READ_ONCE(*ptep);
 679
 680		/* Valid entry? */
 681		if (!pte)
 682			return 0;
 683
 684		/* Leaf entry? */
 685		if (iopte_leaf(pte, lvl, data->iop.fmt))
 686			goto found_translation;
 687
 688		/* Take it to the next level */
 689		ptep = iopte_deref(pte, data);
 690	} while (++lvl < ARM_LPAE_MAX_LEVELS);
 691
 692	/* Ran out of page tables to walk */
 693	return 0;
 694
 695found_translation:
 696	iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
 697	return iopte_to_paddr(pte, data) | iova;
 698}
 699
 700static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
 701{
 702	unsigned long granule, page_sizes;
 703	unsigned int max_addr_bits = 48;
 704
 705	/*
 706	 * We need to restrict the supported page sizes to match the
 707	 * translation regime for a particular granule. Aim to match
 708	 * the CPU page size if possible, otherwise prefer smaller sizes.
 709	 * While we're at it, restrict the block sizes to match the
 710	 * chosen granule.
 711	 */
 712	if (cfg->pgsize_bitmap & PAGE_SIZE)
 713		granule = PAGE_SIZE;
 714	else if (cfg->pgsize_bitmap & ~PAGE_MASK)
 715		granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
 716	else if (cfg->pgsize_bitmap & PAGE_MASK)
 717		granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
 718	else
 719		granule = 0;
 720
 721	switch (granule) {
 722	case SZ_4K:
 723		page_sizes = (SZ_4K | SZ_2M | SZ_1G);
 724		break;
 725	case SZ_16K:
 726		page_sizes = (SZ_16K | SZ_32M);
 727		break;
 728	case SZ_64K:
 729		max_addr_bits = 52;
 730		page_sizes = (SZ_64K | SZ_512M);
 731		if (cfg->oas > 48)
 732			page_sizes |= 1ULL << 42; /* 4TB */
 733		break;
 734	default:
 735		page_sizes = 0;
 736	}
 737
 738	cfg->pgsize_bitmap &= page_sizes;
 739	cfg->ias = min(cfg->ias, max_addr_bits);
 740	cfg->oas = min(cfg->oas, max_addr_bits);
 741}
 742
 743static struct arm_lpae_io_pgtable *
 744arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
 745{
 746	unsigned long va_bits, pgd_bits;
 747	struct arm_lpae_io_pgtable *data;
 
 748
 749	arm_lpae_restrict_pgsizes(cfg);
 750
 751	if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
 752		return NULL;
 753
 754	if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
 755		return NULL;
 756
 757	if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
 758		return NULL;
 759
 760	if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) {
 761		dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n");
 762		return NULL;
 763	}
 764
 765	data = kmalloc(sizeof(*data), GFP_KERNEL);
 766	if (!data)
 767		return NULL;
 768
 769	data->pg_shift = __ffs(cfg->pgsize_bitmap);
 770	data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));
 771
 772	va_bits = cfg->ias - data->pg_shift;
 773	data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
 
 774
 775	/* Calculate the actual size of our pgd (without concatenation) */
 776	pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
 777	data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));
 778
 779	data->iop.ops = (struct io_pgtable_ops) {
 780		.map		= arm_lpae_map,
 781		.unmap		= arm_lpae_unmap,
 782		.iova_to_phys	= arm_lpae_iova_to_phys,
 783	};
 784
 785	return data;
 786}
 787
 788static struct io_pgtable *
 789arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
 790{
 791	u64 reg;
 792	struct arm_lpae_io_pgtable *data;
 
 
 793
 794	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
 795			    IO_PGTABLE_QUIRK_NON_STRICT))
 
 796		return NULL;
 797
 798	data = arm_lpae_alloc_pgtable(cfg);
 799	if (!data)
 800		return NULL;
 801
 802	/* TCR */
 803	if (cfg->coherent_walk) {
 804		reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
 805		      (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
 806		      (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
 807	} else {
 808		reg = (ARM_LPAE_TCR_SH_OS << ARM_LPAE_TCR_SH0_SHIFT) |
 809		      (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_IRGN0_SHIFT) |
 810		      (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_ORGN0_SHIFT);
 811	}
 812
 
 813	switch (ARM_LPAE_GRANULE(data)) {
 814	case SZ_4K:
 815		reg |= ARM_LPAE_TCR_TG0_4K;
 816		break;
 817	case SZ_16K:
 818		reg |= ARM_LPAE_TCR_TG0_16K;
 819		break;
 820	case SZ_64K:
 821		reg |= ARM_LPAE_TCR_TG0_64K;
 822		break;
 823	}
 824
 825	switch (cfg->oas) {
 826	case 32:
 827		reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 828		break;
 829	case 36:
 830		reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 831		break;
 832	case 40:
 833		reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 834		break;
 835	case 42:
 836		reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 837		break;
 838	case 44:
 839		reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 840		break;
 841	case 48:
 842		reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 843		break;
 844	case 52:
 845		reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_IPS_SHIFT);
 846		break;
 847	default:
 848		goto out_free_data;
 849	}
 850
 851	reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
 852
 853	/* Disable speculative walks through TTBR1 */
 854	reg |= ARM_LPAE_TCR_EPD1;
 855	cfg->arm_lpae_s1_cfg.tcr = reg;
 856
 857	/* MAIRs */
 858	reg = (ARM_LPAE_MAIR_ATTR_NC
 859	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
 860	      (ARM_LPAE_MAIR_ATTR_WBRWA
 861	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
 862	      (ARM_LPAE_MAIR_ATTR_DEVICE
 863	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)) |
 864	      (ARM_LPAE_MAIR_ATTR_INC_OWBRWA
 865	       << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE));
 866
 867	cfg->arm_lpae_s1_cfg.mair[0] = reg;
 868	cfg->arm_lpae_s1_cfg.mair[1] = 0;
 869
 870	/* Looking good; allocate a pgd */
 871	data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
 
 872	if (!data->pgd)
 873		goto out_free_data;
 874
 875	/* Ensure the empty pgd is visible before any actual TTBR write */
 876	wmb();
 877
 878	/* TTBRs */
 879	cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
 880	cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
 881	return &data->iop;
 882
 883out_free_data:
 884	kfree(data);
 885	return NULL;
 886}
 887
 888static struct io_pgtable *
 889arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
 890{
 891	u64 reg, sl;
 892	struct arm_lpae_io_pgtable *data;
 
 893
 894	/* The NS quirk doesn't apply at stage 2 */
 895	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_NON_STRICT))
 896		return NULL;
 897
 898	data = arm_lpae_alloc_pgtable(cfg);
 899	if (!data)
 900		return NULL;
 901
 902	/*
 903	 * Concatenate PGDs at level 1 if possible in order to reduce
 904	 * the depth of the stage-2 walk.
 905	 */
 906	if (data->levels == ARM_LPAE_MAX_LEVELS) {
 907		unsigned long pgd_pages;
 908
 909		pgd_pages = data->pgd_size >> ilog2(sizeof(arm_lpae_iopte));
 910		if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
 911			data->pgd_size = pgd_pages << data->pg_shift;
 912			data->levels--;
 913		}
 914	}
 915
 916	/* VTCR */
 917	reg = ARM_64_LPAE_S2_TCR_RES1 |
 918	     (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
 919	     (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
 920	     (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
 
 
 
 
 
 921
 922	sl = ARM_LPAE_START_LVL(data);
 923
 924	switch (ARM_LPAE_GRANULE(data)) {
 925	case SZ_4K:
 926		reg |= ARM_LPAE_TCR_TG0_4K;
 927		sl++; /* SL0 format is different for 4K granule size */
 928		break;
 929	case SZ_16K:
 930		reg |= ARM_LPAE_TCR_TG0_16K;
 931		break;
 932	case SZ_64K:
 933		reg |= ARM_LPAE_TCR_TG0_64K;
 934		break;
 935	}
 936
 937	switch (cfg->oas) {
 938	case 32:
 939		reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_PS_SHIFT);
 940		break;
 941	case 36:
 942		reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_PS_SHIFT);
 943		break;
 944	case 40:
 945		reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_PS_SHIFT);
 946		break;
 947	case 42:
 948		reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_PS_SHIFT);
 949		break;
 950	case 44:
 951		reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_PS_SHIFT);
 952		break;
 953	case 48:
 954		reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_PS_SHIFT);
 955		break;
 956	case 52:
 957		reg |= (ARM_LPAE_TCR_PS_52_BIT << ARM_LPAE_TCR_PS_SHIFT);
 958		break;
 959	default:
 960		goto out_free_data;
 961	}
 962
 963	reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
 964	reg |= (~sl & ARM_LPAE_TCR_SL0_MASK) << ARM_LPAE_TCR_SL0_SHIFT;
 965	cfg->arm_lpae_s2_cfg.vtcr = reg;
 966
 967	/* Allocate pgd pages */
 968	data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
 
 969	if (!data->pgd)
 970		goto out_free_data;
 971
 972	/* Ensure the empty pgd is visible before any actual TTBR write */
 973	wmb();
 974
 975	/* VTTBR */
 976	cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
 977	return &data->iop;
 978
 979out_free_data:
 980	kfree(data);
 981	return NULL;
 982}
 983
 984static struct io_pgtable *
 985arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
 986{
 987	struct io_pgtable *iop;
 988
 989	if (cfg->ias > 32 || cfg->oas > 40)
 990		return NULL;
 991
 992	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
 993	iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
 994	if (iop) {
 995		cfg->arm_lpae_s1_cfg.tcr |= ARM_32_LPAE_TCR_EAE;
 996		cfg->arm_lpae_s1_cfg.tcr &= 0xffffffff;
 997	}
 998
 999	return iop;
1000}
1001
1002static struct io_pgtable *
1003arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
1004{
1005	struct io_pgtable *iop;
1006
1007	if (cfg->ias > 40 || cfg->oas > 40)
1008		return NULL;
1009
1010	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1011	iop = arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
1012	if (iop)
1013		cfg->arm_lpae_s2_cfg.vtcr &= 0xffffffff;
1014
1015	return iop;
1016}
1017
1018static struct io_pgtable *
1019arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
1020{
1021	struct arm_lpae_io_pgtable *data;
1022
1023	/* No quirks for Mali (hopefully) */
1024	if (cfg->quirks)
1025		return NULL;
1026
1027	if (cfg->ias > 48 || cfg->oas > 40)
1028		return NULL;
1029
1030	cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
1031
1032	data = arm_lpae_alloc_pgtable(cfg);
1033	if (!data)
1034		return NULL;
1035
1036	/* Mali seems to need a full 4-level table regardless of IAS */
1037	if (data->levels < ARM_LPAE_MAX_LEVELS) {
1038		data->levels = ARM_LPAE_MAX_LEVELS;
1039		data->pgd_size = sizeof(arm_lpae_iopte);
1040	}
1041	/*
1042	 * MEMATTR: Mali has no actual notion of a non-cacheable type, so the
1043	 * best we can do is mimic the out-of-tree driver and hope that the
1044	 * "implementation-defined caching policy" is good enough. Similarly,
1045	 * we'll use it for the sake of a valid attribute for our 'device'
1046	 * index, although callers should never request that in practice.
1047	 */
1048	cfg->arm_mali_lpae_cfg.memattr =
1049		(ARM_MALI_LPAE_MEMATTR_IMP_DEF
1050		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
1051		(ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC
1052		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
1053		(ARM_MALI_LPAE_MEMATTR_IMP_DEF
1054		 << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
1055
1056	data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
 
1057	if (!data->pgd)
1058		goto out_free_data;
1059
1060	/* Ensure the empty pgd is visible before TRANSTAB can be written */
1061	wmb();
1062
1063	cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
1064					  ARM_MALI_LPAE_TTBR_READ_INNER |
1065					  ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
1066	return &data->iop;
1067
1068out_free_data:
1069	kfree(data);
1070	return NULL;
1071}
1072
1073struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
1074	.alloc	= arm_64_lpae_alloc_pgtable_s1,
1075	.free	= arm_lpae_free_pgtable,
1076};
1077
1078struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
1079	.alloc	= arm_64_lpae_alloc_pgtable_s2,
1080	.free	= arm_lpae_free_pgtable,
1081};
1082
1083struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
1084	.alloc	= arm_32_lpae_alloc_pgtable_s1,
1085	.free	= arm_lpae_free_pgtable,
1086};
1087
1088struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
1089	.alloc	= arm_32_lpae_alloc_pgtable_s2,
1090	.free	= arm_lpae_free_pgtable,
1091};
1092
1093struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = {
1094	.alloc	= arm_mali_lpae_alloc_pgtable,
1095	.free	= arm_lpae_free_pgtable,
1096};
1097
1098#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
1099
1100static struct io_pgtable_cfg *cfg_cookie;
1101
1102static void dummy_tlb_flush_all(void *cookie)
1103{
1104	WARN_ON(cookie != cfg_cookie);
1105}
1106
1107static void dummy_tlb_flush(unsigned long iova, size_t size, size_t granule,
1108			    void *cookie)
1109{
1110	WARN_ON(cookie != cfg_cookie);
1111	WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
1112}
1113
1114static void dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
1115			       unsigned long iova, size_t granule, void *cookie)
 
1116{
1117	dummy_tlb_flush(iova, granule, granule, cookie);
1118}
1119
1120static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
1121	.tlb_flush_all	= dummy_tlb_flush_all,
1122	.tlb_flush_walk	= dummy_tlb_flush,
1123	.tlb_flush_leaf	= dummy_tlb_flush,
1124	.tlb_add_page	= dummy_tlb_add_page,
1125};
1126
1127static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
1128{
1129	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
1130	struct io_pgtable_cfg *cfg = &data->iop.cfg;
1131
1132	pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
1133		cfg->pgsize_bitmap, cfg->ias);
1134	pr_err("data: %d levels, 0x%zx pgd_size, %lu pg_shift, %lu bits_per_level, pgd @ %p\n",
1135		data->levels, data->pgd_size, data->pg_shift,
1136		data->bits_per_level, data->pgd);
1137}
1138
1139#define __FAIL(ops, i)	({						\
1140		WARN(1, "selftest: test failed for fmt idx %d\n", (i));	\
1141		arm_lpae_dump_ops(ops);					\
1142		selftest_running = false;				\
1143		-EFAULT;						\
1144})
1145
1146static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
1147{
1148	static const enum io_pgtable_fmt fmts[] = {
1149		ARM_64_LPAE_S1,
1150		ARM_64_LPAE_S2,
1151	};
1152
1153	int i, j;
1154	unsigned long iova;
1155	size_t size;
1156	struct io_pgtable_ops *ops;
1157
1158	selftest_running = true;
1159
1160	for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
1161		cfg_cookie = cfg;
1162		ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
1163		if (!ops) {
1164			pr_err("selftest: failed to allocate io pgtable ops\n");
1165			return -ENOMEM;
1166		}
1167
1168		/*
1169		 * Initial sanity checks.
1170		 * Empty page tables shouldn't provide any translations.
1171		 */
1172		if (ops->iova_to_phys(ops, 42))
1173			return __FAIL(ops, i);
1174
1175		if (ops->iova_to_phys(ops, SZ_1G + 42))
1176			return __FAIL(ops, i);
1177
1178		if (ops->iova_to_phys(ops, SZ_2G + 42))
1179			return __FAIL(ops, i);
1180
1181		/*
1182		 * Distinct mappings of different granule sizes.
1183		 */
1184		iova = 0;
1185		for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1186			size = 1UL << j;
1187
1188			if (ops->map(ops, iova, iova, size, IOMMU_READ |
1189							    IOMMU_WRITE |
1190							    IOMMU_NOEXEC |
1191							    IOMMU_CACHE))
1192				return __FAIL(ops, i);
1193
1194			/* Overlapping mappings */
1195			if (!ops->map(ops, iova, iova + size, size,
1196				      IOMMU_READ | IOMMU_NOEXEC))
1197				return __FAIL(ops, i);
1198
1199			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1200				return __FAIL(ops, i);
1201
1202			iova += SZ_1G;
1203		}
1204
1205		/* Partial unmap */
1206		size = 1UL << __ffs(cfg->pgsize_bitmap);
1207		if (ops->unmap(ops, SZ_1G + size, size, NULL) != size)
1208			return __FAIL(ops, i);
1209
1210		/* Remap of partial unmap */
1211		if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ))
1212			return __FAIL(ops, i);
1213
1214		if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
1215			return __FAIL(ops, i);
1216
1217		/* Full unmap */
1218		iova = 0;
1219		for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
1220			size = 1UL << j;
1221
1222			if (ops->unmap(ops, iova, size, NULL) != size)
1223				return __FAIL(ops, i);
1224
1225			if (ops->iova_to_phys(ops, iova + 42))
1226				return __FAIL(ops, i);
1227
1228			/* Remap full block */
1229			if (ops->map(ops, iova, iova, size, IOMMU_WRITE))
1230				return __FAIL(ops, i);
1231
1232			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
1233				return __FAIL(ops, i);
1234
1235			iova += SZ_1G;
1236		}
1237
1238		free_io_pgtable_ops(ops);
1239	}
1240
1241	selftest_running = false;
1242	return 0;
1243}
1244
1245static int __init arm_lpae_do_selftests(void)
1246{
1247	static const unsigned long pgsize[] = {
1248		SZ_4K | SZ_2M | SZ_1G,
1249		SZ_16K | SZ_32M,
1250		SZ_64K | SZ_512M,
1251	};
1252
1253	static const unsigned int ias[] = {
1254		32, 36, 40, 42, 44, 48,
1255	};
1256
1257	int i, j, pass = 0, fail = 0;
1258	struct io_pgtable_cfg cfg = {
1259		.tlb = &dummy_tlb_ops,
1260		.oas = 48,
1261		.coherent_walk = true,
1262	};
1263
1264	for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
1265		for (j = 0; j < ARRAY_SIZE(ias); ++j) {
1266			cfg.pgsize_bitmap = pgsize[i];
1267			cfg.ias = ias[j];
1268			pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
1269				pgsize[i], ias[j]);
1270			if (arm_lpae_run_tests(&cfg))
1271				fail++;
1272			else
1273				pass++;
1274		}
1275	}
1276
1277	pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
1278	return fail ? -EFAULT : 0;
1279}
1280subsys_initcall(arm_lpae_do_selftests);
1281#endif