1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2011,2016 Samsung Electronics Co., Ltd. 4 * http://www.samsung.com 5 */ 6 7 #ifdef CONFIG_EXYNOS_IOMMU_DEBUG 8 #define DEBUG 9 #endif 10 11 #include <linux/clk.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/err.h> 14 #include <linux/io.h> 15 #include <linux/iommu.h> 16 #include <linux/interrupt.h> 17 #include <linux/kmemleak.h> 18 #include <linux/list.h> 19 #include <linux/of.h> 20 #include <linux/of_iommu.h> 21 #include <linux/of_platform.h> 22 #include <linux/platform_device.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/slab.h> 25 #include <linux/dma-iommu.h> 26 27 typedef u32 sysmmu_iova_t; 28 typedef u32 sysmmu_pte_t; 29 30 /* We do not consider super section mapping (16MB) */ 31 #define SECT_ORDER 20 32 #define LPAGE_ORDER 16 33 #define SPAGE_ORDER 12 34 35 #define SECT_SIZE (1 << SECT_ORDER) 36 #define LPAGE_SIZE (1 << LPAGE_ORDER) 37 #define SPAGE_SIZE (1 << SPAGE_ORDER) 38 39 #define SECT_MASK (~(SECT_SIZE - 1)) 40 #define LPAGE_MASK (~(LPAGE_SIZE - 1)) 41 #define SPAGE_MASK (~(SPAGE_SIZE - 1)) 42 43 #define lv1ent_fault(sent) ((*(sent) == ZERO_LV2LINK) || \ 44 ((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) 45 #define lv1ent_zero(sent) (*(sent) == ZERO_LV2LINK) 46 #define lv1ent_page_zero(sent) ((*(sent) & 3) == 1) 47 #define lv1ent_page(sent) ((*(sent) != ZERO_LV2LINK) && \ 48 ((*(sent) & 3) == 1)) 49 #define lv1ent_section(sent) ((*(sent) & 3) == 2) 50 51 #define lv2ent_fault(pent) ((*(pent) & 3) == 0) 52 #define lv2ent_small(pent) ((*(pent) & 2) == 2) 53 #define lv2ent_large(pent) ((*(pent) & 3) == 1) 54 55 /* 56 * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces 57 * v5.0 introduced support for 36bit physical address space by shifting 58 * all page entry values by 4 bits. 59 * All SYSMMU controllers in the system support the address spaces of the same 60 * size, so PG_ENT_SHIFT can be initialized on first SYSMMU probe to proper 61 * value (0 or 4). 62 */ 63 static short PG_ENT_SHIFT = -1; 64 #define SYSMMU_PG_ENT_SHIFT 0 65 #define SYSMMU_V5_PG_ENT_SHIFT 4 66 67 static const sysmmu_pte_t *LV1_PROT; 68 static const sysmmu_pte_t SYSMMU_LV1_PROT[] = { 69 ((0 << 15) | (0 << 10)), /* no access */ 70 ((1 << 15) | (1 << 10)), /* IOMMU_READ only */ 71 ((0 << 15) | (1 << 10)), /* IOMMU_WRITE not supported, use read/write */ 72 ((0 << 15) | (1 << 10)), /* IOMMU_READ | IOMMU_WRITE */ 73 }; 74 static const sysmmu_pte_t SYSMMU_V5_LV1_PROT[] = { 75 (0 << 4), /* no access */ 76 (1 << 4), /* IOMMU_READ only */ 77 (2 << 4), /* IOMMU_WRITE only */ 78 (3 << 4), /* IOMMU_READ | IOMMU_WRITE */ 79 }; 80 81 static const sysmmu_pte_t *LV2_PROT; 82 static const sysmmu_pte_t SYSMMU_LV2_PROT[] = { 83 ((0 << 9) | (0 << 4)), /* no access */ 84 ((1 << 9) | (1 << 4)), /* IOMMU_READ only */ 85 ((0 << 9) | (1 << 4)), /* IOMMU_WRITE not supported, use read/write */ 86 ((0 << 9) | (1 << 4)), /* IOMMU_READ | IOMMU_WRITE */ 87 }; 88 static const sysmmu_pte_t SYSMMU_V5_LV2_PROT[] = { 89 (0 << 2), /* no access */ 90 (1 << 2), /* IOMMU_READ only */ 91 (2 << 2), /* IOMMU_WRITE only */ 92 (3 << 2), /* IOMMU_READ | IOMMU_WRITE */ 93 }; 94 95 #define SYSMMU_SUPPORTED_PROT_BITS (IOMMU_READ | IOMMU_WRITE) 96 97 #define sect_to_phys(ent) (((phys_addr_t) ent) << PG_ENT_SHIFT) 98 #define section_phys(sent) (sect_to_phys(*(sent)) & SECT_MASK) 99 #define section_offs(iova) (iova & (SECT_SIZE - 1)) 100 #define lpage_phys(pent) (sect_to_phys(*(pent)) & LPAGE_MASK) 101 #define lpage_offs(iova) (iova & (LPAGE_SIZE - 1)) 102 #define spage_phys(pent) (sect_to_phys(*(pent)) & SPAGE_MASK) 103 #define spage_offs(iova) (iova & (SPAGE_SIZE - 1)) 104 105 #define NUM_LV1ENTRIES 4096 106 #define NUM_LV2ENTRIES (SECT_SIZE / SPAGE_SIZE) 107 108 static u32 lv1ent_offset(sysmmu_iova_t iova) 109 { 110 return iova >> SECT_ORDER; 111 } 112 113 static u32 lv2ent_offset(sysmmu_iova_t iova) 114 { 115 return (iova >> SPAGE_ORDER) & (NUM_LV2ENTRIES - 1); 116 } 117 118 #define LV1TABLE_SIZE (NUM_LV1ENTRIES * sizeof(sysmmu_pte_t)) 119 #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(sysmmu_pte_t)) 120 121 #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) 122 #define lv2table_base(sent) (sect_to_phys(*(sent) & 0xFFFFFFC0)) 123 124 #define mk_lv1ent_sect(pa, prot) ((pa >> PG_ENT_SHIFT) | LV1_PROT[prot] | 2) 125 #define mk_lv1ent_page(pa) ((pa >> PG_ENT_SHIFT) | 1) 126 #define mk_lv2ent_lpage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 1) 127 #define mk_lv2ent_spage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 2) 128 129 #define CTRL_ENABLE 0x5 130 #define CTRL_BLOCK 0x7 131 #define CTRL_DISABLE 0x0 132 133 #define CFG_LRU 0x1 134 #define CFG_EAP (1 << 2) 135 #define CFG_QOS(n) ((n & 0xF) << 7) 136 #define CFG_ACGEN (1 << 24) /* System MMU 3.3 only */ 137 #define CFG_SYSSEL (1 << 22) /* System MMU 3.2 only */ 138 #define CFG_FLPDCACHE (1 << 20) /* System MMU 3.2+ only */ 139 140 /* common registers */ 141 #define REG_MMU_CTRL 0x000 142 #define REG_MMU_CFG 0x004 143 #define REG_MMU_STATUS 0x008 144 #define REG_MMU_VERSION 0x034 145 146 #define MMU_MAJ_VER(val) ((val) >> 7) 147 #define MMU_MIN_VER(val) ((val) & 0x7F) 148 #define MMU_RAW_VER(reg) (((reg) >> 21) & ((1 << 11) - 1)) /* 11 bits */ 149 150 #define MAKE_MMU_VER(maj, min) ((((maj) & 0xF) << 7) | ((min) & 0x7F)) 151 152 /* v1.x - v3.x registers */ 153 #define REG_MMU_FLUSH 0x00C 154 #define REG_MMU_FLUSH_ENTRY 0x010 155 #define REG_PT_BASE_ADDR 0x014 156 #define REG_INT_STATUS 0x018 157 #define REG_INT_CLEAR 0x01C 158 159 #define REG_PAGE_FAULT_ADDR 0x024 160 #define REG_AW_FAULT_ADDR 0x028 161 #define REG_AR_FAULT_ADDR 0x02C 162 #define REG_DEFAULT_SLAVE_ADDR 0x030 163 164 /* v5.x registers */ 165 #define REG_V5_PT_BASE_PFN 0x00C 166 #define REG_V5_MMU_FLUSH_ALL 0x010 167 #define REG_V5_MMU_FLUSH_ENTRY 0x014 168 #define REG_V5_MMU_FLUSH_RANGE 0x018 169 #define REG_V5_MMU_FLUSH_START 0x020 170 #define REG_V5_MMU_FLUSH_END 0x024 171 #define REG_V5_INT_STATUS 0x060 172 #define REG_V5_INT_CLEAR 0x064 173 #define REG_V5_FAULT_AR_VA 0x070 174 #define REG_V5_FAULT_AW_VA 0x080 175 176 #define has_sysmmu(dev) (dev_iommu_priv_get(dev) != NULL) 177 178 static struct device *dma_dev; 179 static struct kmem_cache *lv2table_kmem_cache; 180 static sysmmu_pte_t *zero_lv2_table; 181 #define ZERO_LV2LINK mk_lv1ent_page(virt_to_phys(zero_lv2_table)) 182 183 static sysmmu_pte_t *section_entry(sysmmu_pte_t *pgtable, sysmmu_iova_t iova) 184 { 185 return pgtable + lv1ent_offset(iova); 186 } 187 188 static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova) 189 { 190 return (sysmmu_pte_t *)phys_to_virt( 191 lv2table_base(sent)) + lv2ent_offset(iova); 192 } 193 194 /* 195 * IOMMU fault information register 196 */ 197 struct sysmmu_fault_info { 198 unsigned int bit; /* bit number in STATUS register */ 199 unsigned short addr_reg; /* register to read VA fault address */ 200 const char *name; /* human readable fault name */ 201 unsigned int type; /* fault type for report_iommu_fault */ 202 }; 203 204 static const struct sysmmu_fault_info sysmmu_faults[] = { 205 { 0, REG_PAGE_FAULT_ADDR, "PAGE", IOMMU_FAULT_READ }, 206 { 1, REG_AR_FAULT_ADDR, "AR MULTI-HIT", IOMMU_FAULT_READ }, 207 { 2, REG_AW_FAULT_ADDR, "AW MULTI-HIT", IOMMU_FAULT_WRITE }, 208 { 3, REG_DEFAULT_SLAVE_ADDR, "BUS ERROR", IOMMU_FAULT_READ }, 209 { 4, REG_AR_FAULT_ADDR, "AR SECURITY PROTECTION", IOMMU_FAULT_READ }, 210 { 5, REG_AR_FAULT_ADDR, "AR ACCESS PROTECTION", IOMMU_FAULT_READ }, 211 { 6, REG_AW_FAULT_ADDR, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE }, 212 { 7, REG_AW_FAULT_ADDR, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE }, 213 }; 214 215 static const struct sysmmu_fault_info sysmmu_v5_faults[] = { 216 { 0, REG_V5_FAULT_AR_VA, "AR PTW", IOMMU_FAULT_READ }, 217 { 1, REG_V5_FAULT_AR_VA, "AR PAGE", IOMMU_FAULT_READ }, 218 { 2, REG_V5_FAULT_AR_VA, "AR MULTI-HIT", IOMMU_FAULT_READ }, 219 { 3, REG_V5_FAULT_AR_VA, "AR ACCESS PROTECTION", IOMMU_FAULT_READ }, 220 { 4, REG_V5_FAULT_AR_VA, "AR SECURITY PROTECTION", IOMMU_FAULT_READ }, 221 { 16, REG_V5_FAULT_AW_VA, "AW PTW", IOMMU_FAULT_WRITE }, 222 { 17, REG_V5_FAULT_AW_VA, "AW PAGE", IOMMU_FAULT_WRITE }, 223 { 18, REG_V5_FAULT_AW_VA, "AW MULTI-HIT", IOMMU_FAULT_WRITE }, 224 { 19, REG_V5_FAULT_AW_VA, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE }, 225 { 20, REG_V5_FAULT_AW_VA, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE }, 226 }; 227 228 /* 229 * This structure is attached to dev->iommu->priv of the master device 230 * on device add, contains a list of SYSMMU controllers defined by device tree, 231 * which are bound to given master device. It is usually referenced by 'owner' 232 * pointer. 233 */ 234 struct exynos_iommu_owner { 235 struct list_head controllers; /* list of sysmmu_drvdata.owner_node */ 236 struct iommu_domain *domain; /* domain this device is attached */ 237 struct mutex rpm_lock; /* for runtime pm of all sysmmus */ 238 }; 239 240 /* 241 * This structure exynos specific generalization of struct iommu_domain. 242 * It contains list of SYSMMU controllers from all master devices, which has 243 * been attached to this domain and page tables of IO address space defined by 244 * it. It is usually referenced by 'domain' pointer. 245 */ 246 struct exynos_iommu_domain { 247 struct list_head clients; /* list of sysmmu_drvdata.domain_node */ 248 sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */ 249 short *lv2entcnt; /* free lv2 entry counter for each section */ 250 spinlock_t lock; /* lock for modyfying list of clients */ 251 spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ 252 struct iommu_domain domain; /* generic domain data structure */ 253 }; 254 255 /* 256 * This structure hold all data of a single SYSMMU controller, this includes 257 * hw resources like registers and clocks, pointers and list nodes to connect 258 * it to all other structures, internal state and parameters read from device 259 * tree. It is usually referenced by 'data' pointer. 260 */ 261 struct sysmmu_drvdata { 262 struct device *sysmmu; /* SYSMMU controller device */ 263 struct device *master; /* master device (owner) */ 264 struct device_link *link; /* runtime PM link to master */ 265 void __iomem *sfrbase; /* our registers */ 266 struct clk *clk; /* SYSMMU's clock */ 267 struct clk *aclk; /* SYSMMU's aclk clock */ 268 struct clk *pclk; /* SYSMMU's pclk clock */ 269 struct clk *clk_master; /* master's device clock */ 270 spinlock_t lock; /* lock for modyfying state */ 271 bool active; /* current status */ 272 struct exynos_iommu_domain *domain; /* domain we belong to */ 273 struct list_head domain_node; /* node for domain clients list */ 274 struct list_head owner_node; /* node for owner controllers list */ 275 phys_addr_t pgtable; /* assigned page table structure */ 276 unsigned int version; /* our version */ 277 278 struct iommu_device iommu; /* IOMMU core handle */ 279 }; 280 281 static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) 282 { 283 return container_of(dom, struct exynos_iommu_domain, domain); 284 } 285 286 static void sysmmu_unblock(struct sysmmu_drvdata *data) 287 { 288 writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); 289 } 290 291 static bool sysmmu_block(struct sysmmu_drvdata *data) 292 { 293 int i = 120; 294 295 writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL); 296 while ((i > 0) && !(readl(data->sfrbase + REG_MMU_STATUS) & 1)) 297 --i; 298 299 if (!(readl(data->sfrbase + REG_MMU_STATUS) & 1)) { 300 sysmmu_unblock(data); 301 return false; 302 } 303 304 return true; 305 } 306 307 static void __sysmmu_tlb_invalidate(struct sysmmu_drvdata *data) 308 { 309 if (MMU_MAJ_VER(data->version) < 5) 310 writel(0x1, data->sfrbase + REG_MMU_FLUSH); 311 else 312 writel(0x1, data->sfrbase + REG_V5_MMU_FLUSH_ALL); 313 } 314 315 static void __sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, 316 sysmmu_iova_t iova, unsigned int num_inv) 317 { 318 unsigned int i; 319 320 if (MMU_MAJ_VER(data->version) < 5) { 321 for (i = 0; i < num_inv; i++) { 322 writel((iova & SPAGE_MASK) | 1, 323 data->sfrbase + REG_MMU_FLUSH_ENTRY); 324 iova += SPAGE_SIZE; 325 } 326 } else { 327 if (num_inv == 1) { 328 writel((iova & SPAGE_MASK) | 1, 329 data->sfrbase + REG_V5_MMU_FLUSH_ENTRY); 330 } else { 331 writel((iova & SPAGE_MASK), 332 data->sfrbase + REG_V5_MMU_FLUSH_START); 333 writel((iova & SPAGE_MASK) + (num_inv - 1) * SPAGE_SIZE, 334 data->sfrbase + REG_V5_MMU_FLUSH_END); 335 writel(1, data->sfrbase + REG_V5_MMU_FLUSH_RANGE); 336 } 337 } 338 } 339 340 static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd) 341 { 342 if (MMU_MAJ_VER(data->version) < 5) 343 writel(pgd, data->sfrbase + REG_PT_BASE_ADDR); 344 else 345 writel(pgd >> PAGE_SHIFT, 346 data->sfrbase + REG_V5_PT_BASE_PFN); 347 348 __sysmmu_tlb_invalidate(data); 349 } 350 351 static void __sysmmu_enable_clocks(struct sysmmu_drvdata *data) 352 { 353 BUG_ON(clk_prepare_enable(data->clk_master)); 354 BUG_ON(clk_prepare_enable(data->clk)); 355 BUG_ON(clk_prepare_enable(data->pclk)); 356 BUG_ON(clk_prepare_enable(data->aclk)); 357 } 358 359 static void __sysmmu_disable_clocks(struct sysmmu_drvdata *data) 360 { 361 clk_disable_unprepare(data->aclk); 362 clk_disable_unprepare(data->pclk); 363 clk_disable_unprepare(data->clk); 364 clk_disable_unprepare(data->clk_master); 365 } 366 367 static void __sysmmu_get_version(struct sysmmu_drvdata *data) 368 { 369 u32 ver; 370 371 __sysmmu_enable_clocks(data); 372 373 ver = readl(data->sfrbase + REG_MMU_VERSION); 374 375 /* controllers on some SoCs don't report proper version */ 376 if (ver == 0x80000001u) 377 data->version = MAKE_MMU_VER(1, 0); 378 else 379 data->version = MMU_RAW_VER(ver); 380 381 dev_dbg(data->sysmmu, "hardware version: %d.%d\n", 382 MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version)); 383 384 __sysmmu_disable_clocks(data); 385 } 386 387 static void show_fault_information(struct sysmmu_drvdata *data, 388 const struct sysmmu_fault_info *finfo, 389 sysmmu_iova_t fault_addr) 390 { 391 sysmmu_pte_t *ent; 392 393 dev_err(data->sysmmu, "%s: %s FAULT occurred at %#x\n", 394 dev_name(data->master), finfo->name, fault_addr); 395 dev_dbg(data->sysmmu, "Page table base: %pa\n", &data->pgtable); 396 ent = section_entry(phys_to_virt(data->pgtable), fault_addr); 397 dev_dbg(data->sysmmu, "\tLv1 entry: %#x\n", *ent); 398 if (lv1ent_page(ent)) { 399 ent = page_entry(ent, fault_addr); 400 dev_dbg(data->sysmmu, "\t Lv2 entry: %#x\n", *ent); 401 } 402 } 403 404 static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) 405 { 406 /* SYSMMU is in blocked state when interrupt occurred. */ 407 struct sysmmu_drvdata *data = dev_id; 408 const struct sysmmu_fault_info *finfo; 409 unsigned int i, n, itype; 410 sysmmu_iova_t fault_addr = -1; 411 unsigned short reg_status, reg_clear; 412 int ret = -ENOSYS; 413 414 WARN_ON(!data->active); 415 416 if (MMU_MAJ_VER(data->version) < 5) { 417 reg_status = REG_INT_STATUS; 418 reg_clear = REG_INT_CLEAR; 419 finfo = sysmmu_faults; 420 n = ARRAY_SIZE(sysmmu_faults); 421 } else { 422 reg_status = REG_V5_INT_STATUS; 423 reg_clear = REG_V5_INT_CLEAR; 424 finfo = sysmmu_v5_faults; 425 n = ARRAY_SIZE(sysmmu_v5_faults); 426 } 427 428 spin_lock(&data->lock); 429 430 clk_enable(data->clk_master); 431 432 itype = __ffs(readl(data->sfrbase + reg_status)); 433 for (i = 0; i < n; i++, finfo++) 434 if (finfo->bit == itype) 435 break; 436 /* unknown/unsupported fault */ 437 BUG_ON(i == n); 438 439 /* print debug message */ 440 fault_addr = readl(data->sfrbase + finfo->addr_reg); 441 show_fault_information(data, finfo, fault_addr); 442 443 if (data->domain) 444 ret = report_iommu_fault(&data->domain->domain, 445 data->master, fault_addr, finfo->type); 446 /* fault is not recovered by fault handler */ 447 BUG_ON(ret != 0); 448 449 writel(1 << itype, data->sfrbase + reg_clear); 450 451 sysmmu_unblock(data); 452 453 clk_disable(data->clk_master); 454 455 spin_unlock(&data->lock); 456 457 return IRQ_HANDLED; 458 } 459 460 static void __sysmmu_disable(struct sysmmu_drvdata *data) 461 { 462 unsigned long flags; 463 464 clk_enable(data->clk_master); 465 466 spin_lock_irqsave(&data->lock, flags); 467 writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL); 468 writel(0, data->sfrbase + REG_MMU_CFG); 469 data->active = false; 470 spin_unlock_irqrestore(&data->lock, flags); 471 472 __sysmmu_disable_clocks(data); 473 } 474 475 static void __sysmmu_init_config(struct sysmmu_drvdata *data) 476 { 477 unsigned int cfg; 478 479 if (data->version <= MAKE_MMU_VER(3, 1)) 480 cfg = CFG_LRU | CFG_QOS(15); 481 else if (data->version <= MAKE_MMU_VER(3, 2)) 482 cfg = CFG_LRU | CFG_QOS(15) | CFG_FLPDCACHE | CFG_SYSSEL; 483 else 484 cfg = CFG_QOS(15) | CFG_FLPDCACHE | CFG_ACGEN; 485 486 cfg |= CFG_EAP; /* enable access protection bits check */ 487 488 writel(cfg, data->sfrbase + REG_MMU_CFG); 489 } 490 491 static void __sysmmu_enable(struct sysmmu_drvdata *data) 492 { 493 unsigned long flags; 494 495 __sysmmu_enable_clocks(data); 496 497 spin_lock_irqsave(&data->lock, flags); 498 writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL); 499 __sysmmu_init_config(data); 500 __sysmmu_set_ptbase(data, data->pgtable); 501 writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); 502 data->active = true; 503 spin_unlock_irqrestore(&data->lock, flags); 504 505 /* 506 * SYSMMU driver keeps master's clock enabled only for the short 507 * time, while accessing the registers. For performing address 508 * translation during DMA transaction it relies on the client 509 * driver to enable it. 510 */ 511 clk_disable(data->clk_master); 512 } 513 514 static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, 515 sysmmu_iova_t iova) 516 { 517 unsigned long flags; 518 519 spin_lock_irqsave(&data->lock, flags); 520 if (data->active && data->version >= MAKE_MMU_VER(3, 3)) { 521 clk_enable(data->clk_master); 522 if (sysmmu_block(data)) { 523 if (data->version >= MAKE_MMU_VER(5, 0)) 524 __sysmmu_tlb_invalidate(data); 525 else 526 __sysmmu_tlb_invalidate_entry(data, iova, 1); 527 sysmmu_unblock(data); 528 } 529 clk_disable(data->clk_master); 530 } 531 spin_unlock_irqrestore(&data->lock, flags); 532 } 533 534 static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, 535 sysmmu_iova_t iova, size_t size) 536 { 537 unsigned long flags; 538 539 spin_lock_irqsave(&data->lock, flags); 540 if (data->active) { 541 unsigned int num_inv = 1; 542 543 clk_enable(data->clk_master); 544 545 /* 546 * L2TLB invalidation required 547 * 4KB page: 1 invalidation 548 * 64KB page: 16 invalidations 549 * 1MB page: 64 invalidations 550 * because it is set-associative TLB 551 * with 8-way and 64 sets. 552 * 1MB page can be cached in one of all sets. 553 * 64KB page can be one of 16 consecutive sets. 554 */ 555 if (MMU_MAJ_VER(data->version) == 2) 556 num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); 557 558 if (sysmmu_block(data)) { 559 __sysmmu_tlb_invalidate_entry(data, iova, num_inv); 560 sysmmu_unblock(data); 561 } 562 clk_disable(data->clk_master); 563 } 564 spin_unlock_irqrestore(&data->lock, flags); 565 } 566 567 static const struct iommu_ops exynos_iommu_ops; 568 569 static int exynos_sysmmu_probe(struct platform_device *pdev) 570 { 571 int irq, ret; 572 struct device *dev = &pdev->dev; 573 struct sysmmu_drvdata *data; 574 struct resource *res; 575 576 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 577 if (!data) 578 return -ENOMEM; 579 580 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 581 data->sfrbase = devm_ioremap_resource(dev, res); 582 if (IS_ERR(data->sfrbase)) 583 return PTR_ERR(data->sfrbase); 584 585 irq = platform_get_irq(pdev, 0); 586 if (irq <= 0) 587 return irq; 588 589 ret = devm_request_irq(dev, irq, exynos_sysmmu_irq, 0, 590 dev_name(dev), data); 591 if (ret) { 592 dev_err(dev, "Unabled to register handler of irq %d\n", irq); 593 return ret; 594 } 595 596 data->clk = devm_clk_get(dev, "sysmmu"); 597 if (PTR_ERR(data->clk) == -ENOENT) 598 data->clk = NULL; 599 else if (IS_ERR(data->clk)) 600 return PTR_ERR(data->clk); 601 602 data->aclk = devm_clk_get(dev, "aclk"); 603 if (PTR_ERR(data->aclk) == -ENOENT) 604 data->aclk = NULL; 605 else if (IS_ERR(data->aclk)) 606 return PTR_ERR(data->aclk); 607 608 data->pclk = devm_clk_get(dev, "pclk"); 609 if (PTR_ERR(data->pclk) == -ENOENT) 610 data->pclk = NULL; 611 else if (IS_ERR(data->pclk)) 612 return PTR_ERR(data->pclk); 613 614 if (!data->clk && (!data->aclk || !data->pclk)) { 615 dev_err(dev, "Failed to get device clock(s)!\n"); 616 return -ENOSYS; 617 } 618 619 data->clk_master = devm_clk_get(dev, "master"); 620 if (PTR_ERR(data->clk_master) == -ENOENT) 621 data->clk_master = NULL; 622 else if (IS_ERR(data->clk_master)) 623 return PTR_ERR(data->clk_master); 624 625 data->sysmmu = dev; 626 spin_lock_init(&data->lock); 627 628 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL, 629 dev_name(data->sysmmu)); 630 if (ret) 631 return ret; 632 633 iommu_device_set_ops(&data->iommu, &exynos_iommu_ops); 634 iommu_device_set_fwnode(&data->iommu, &dev->of_node->fwnode); 635 636 ret = iommu_device_register(&data->iommu); 637 if (ret) 638 return ret; 639 640 platform_set_drvdata(pdev, data); 641 642 __sysmmu_get_version(data); 643 if (PG_ENT_SHIFT < 0) { 644 if (MMU_MAJ_VER(data->version) < 5) { 645 PG_ENT_SHIFT = SYSMMU_PG_ENT_SHIFT; 646 LV1_PROT = SYSMMU_LV1_PROT; 647 LV2_PROT = SYSMMU_LV2_PROT; 648 } else { 649 PG_ENT_SHIFT = SYSMMU_V5_PG_ENT_SHIFT; 650 LV1_PROT = SYSMMU_V5_LV1_PROT; 651 LV2_PROT = SYSMMU_V5_LV2_PROT; 652 } 653 } 654 655 /* 656 * use the first registered sysmmu device for performing 657 * dma mapping operations on iommu page tables (cpu cache flush) 658 */ 659 if (!dma_dev) 660 dma_dev = &pdev->dev; 661 662 pm_runtime_enable(dev); 663 664 return 0; 665 } 666 667 static int __maybe_unused exynos_sysmmu_suspend(struct device *dev) 668 { 669 struct sysmmu_drvdata *data = dev_get_drvdata(dev); 670 struct device *master = data->master; 671 672 if (master) { 673 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master); 674 675 mutex_lock(&owner->rpm_lock); 676 if (data->domain) { 677 dev_dbg(data->sysmmu, "saving state\n"); 678 __sysmmu_disable(data); 679 } 680 mutex_unlock(&owner->rpm_lock); 681 } 682 return 0; 683 } 684 685 static int __maybe_unused exynos_sysmmu_resume(struct device *dev) 686 { 687 struct sysmmu_drvdata *data = dev_get_drvdata(dev); 688 struct device *master = data->master; 689 690 if (master) { 691 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master); 692 693 mutex_lock(&owner->rpm_lock); 694 if (data->domain) { 695 dev_dbg(data->sysmmu, "restoring state\n"); 696 __sysmmu_enable(data); 697 } 698 mutex_unlock(&owner->rpm_lock); 699 } 700 return 0; 701 } 702 703 static const struct dev_pm_ops sysmmu_pm_ops = { 704 SET_RUNTIME_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume, NULL) 705 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 706 pm_runtime_force_resume) 707 }; 708 709 static const struct of_device_id sysmmu_of_match[] = { 710 { .compatible = "samsung,exynos-sysmmu", }, 711 { }, 712 }; 713 714 static struct platform_driver exynos_sysmmu_driver __refdata = { 715 .probe = exynos_sysmmu_probe, 716 .driver = { 717 .name = "exynos-sysmmu", 718 .of_match_table = sysmmu_of_match, 719 .pm = &sysmmu_pm_ops, 720 .suppress_bind_attrs = true, 721 } 722 }; 723 724 static inline void exynos_iommu_set_pte(sysmmu_pte_t *ent, sysmmu_pte_t val) 725 { 726 dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), sizeof(*ent), 727 DMA_TO_DEVICE); 728 *ent = cpu_to_le32(val); 729 dma_sync_single_for_device(dma_dev, virt_to_phys(ent), sizeof(*ent), 730 DMA_TO_DEVICE); 731 } 732 733 static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) 734 { 735 struct exynos_iommu_domain *domain; 736 dma_addr_t handle; 737 int i; 738 739 /* Check if correct PTE offsets are initialized */ 740 BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev); 741 742 domain = kzalloc(sizeof(*domain), GFP_KERNEL); 743 if (!domain) 744 return NULL; 745 746 if (type == IOMMU_DOMAIN_DMA) { 747 if (iommu_get_dma_cookie(&domain->domain) != 0) 748 goto err_pgtable; 749 } else if (type != IOMMU_DOMAIN_UNMANAGED) { 750 goto err_pgtable; 751 } 752 753 domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); 754 if (!domain->pgtable) 755 goto err_dma_cookie; 756 757 domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); 758 if (!domain->lv2entcnt) 759 goto err_counter; 760 761 /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */ 762 for (i = 0; i < NUM_LV1ENTRIES; i++) 763 domain->pgtable[i] = ZERO_LV2LINK; 764 765 handle = dma_map_single(dma_dev, domain->pgtable, LV1TABLE_SIZE, 766 DMA_TO_DEVICE); 767 /* For mapping page table entries we rely on dma == phys */ 768 BUG_ON(handle != virt_to_phys(domain->pgtable)); 769 if (dma_mapping_error(dma_dev, handle)) 770 goto err_lv2ent; 771 772 spin_lock_init(&domain->lock); 773 spin_lock_init(&domain->pgtablelock); 774 INIT_LIST_HEAD(&domain->clients); 775 776 domain->domain.geometry.aperture_start = 0; 777 domain->domain.geometry.aperture_end = ~0UL; 778 domain->domain.geometry.force_aperture = true; 779 780 return &domain->domain; 781 782 err_lv2ent: 783 free_pages((unsigned long)domain->lv2entcnt, 1); 784 err_counter: 785 free_pages((unsigned long)domain->pgtable, 2); 786 err_dma_cookie: 787 if (type == IOMMU_DOMAIN_DMA) 788 iommu_put_dma_cookie(&domain->domain); 789 err_pgtable: 790 kfree(domain); 791 return NULL; 792 } 793 794 static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) 795 { 796 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 797 struct sysmmu_drvdata *data, *next; 798 unsigned long flags; 799 int i; 800 801 WARN_ON(!list_empty(&domain->clients)); 802 803 spin_lock_irqsave(&domain->lock, flags); 804 805 list_for_each_entry_safe(data, next, &domain->clients, domain_node) { 806 spin_lock(&data->lock); 807 __sysmmu_disable(data); 808 data->pgtable = 0; 809 data->domain = NULL; 810 list_del_init(&data->domain_node); 811 spin_unlock(&data->lock); 812 } 813 814 spin_unlock_irqrestore(&domain->lock, flags); 815 816 if (iommu_domain->type == IOMMU_DOMAIN_DMA) 817 iommu_put_dma_cookie(iommu_domain); 818 819 dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE, 820 DMA_TO_DEVICE); 821 822 for (i = 0; i < NUM_LV1ENTRIES; i++) 823 if (lv1ent_page(domain->pgtable + i)) { 824 phys_addr_t base = lv2table_base(domain->pgtable + i); 825 826 dma_unmap_single(dma_dev, base, LV2TABLE_SIZE, 827 DMA_TO_DEVICE); 828 kmem_cache_free(lv2table_kmem_cache, 829 phys_to_virt(base)); 830 } 831 832 free_pages((unsigned long)domain->pgtable, 2); 833 free_pages((unsigned long)domain->lv2entcnt, 1); 834 kfree(domain); 835 } 836 837 static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, 838 struct device *dev) 839 { 840 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 841 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); 842 phys_addr_t pagetable = virt_to_phys(domain->pgtable); 843 struct sysmmu_drvdata *data, *next; 844 unsigned long flags; 845 846 if (!has_sysmmu(dev) || owner->domain != iommu_domain) 847 return; 848 849 mutex_lock(&owner->rpm_lock); 850 851 list_for_each_entry(data, &owner->controllers, owner_node) { 852 pm_runtime_get_noresume(data->sysmmu); 853 if (pm_runtime_active(data->sysmmu)) 854 __sysmmu_disable(data); 855 pm_runtime_put(data->sysmmu); 856 } 857 858 spin_lock_irqsave(&domain->lock, flags); 859 list_for_each_entry_safe(data, next, &domain->clients, domain_node) { 860 spin_lock(&data->lock); 861 data->pgtable = 0; 862 data->domain = NULL; 863 list_del_init(&data->domain_node); 864 spin_unlock(&data->lock); 865 } 866 owner->domain = NULL; 867 spin_unlock_irqrestore(&domain->lock, flags); 868 869 mutex_unlock(&owner->rpm_lock); 870 871 dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__, 872 &pagetable); 873 } 874 875 static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, 876 struct device *dev) 877 { 878 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 879 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); 880 struct sysmmu_drvdata *data; 881 phys_addr_t pagetable = virt_to_phys(domain->pgtable); 882 unsigned long flags; 883 884 if (!has_sysmmu(dev)) 885 return -ENODEV; 886 887 if (owner->domain) 888 exynos_iommu_detach_device(owner->domain, dev); 889 890 mutex_lock(&owner->rpm_lock); 891 892 spin_lock_irqsave(&domain->lock, flags); 893 list_for_each_entry(data, &owner->controllers, owner_node) { 894 spin_lock(&data->lock); 895 data->pgtable = pagetable; 896 data->domain = domain; 897 list_add_tail(&data->domain_node, &domain->clients); 898 spin_unlock(&data->lock); 899 } 900 owner->domain = iommu_domain; 901 spin_unlock_irqrestore(&domain->lock, flags); 902 903 list_for_each_entry(data, &owner->controllers, owner_node) { 904 pm_runtime_get_noresume(data->sysmmu); 905 if (pm_runtime_active(data->sysmmu)) 906 __sysmmu_enable(data); 907 pm_runtime_put(data->sysmmu); 908 } 909 910 mutex_unlock(&owner->rpm_lock); 911 912 dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__, 913 &pagetable); 914 915 return 0; 916 } 917 918 static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, 919 sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter) 920 { 921 if (lv1ent_section(sent)) { 922 WARN(1, "Trying mapping on %#08x mapped with 1MiB page", iova); 923 return ERR_PTR(-EADDRINUSE); 924 } 925 926 if (lv1ent_fault(sent)) { 927 dma_addr_t handle; 928 sysmmu_pte_t *pent; 929 bool need_flush_flpd_cache = lv1ent_zero(sent); 930 931 pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC); 932 BUG_ON((uintptr_t)pent & (LV2TABLE_SIZE - 1)); 933 if (!pent) 934 return ERR_PTR(-ENOMEM); 935 936 exynos_iommu_set_pte(sent, mk_lv1ent_page(virt_to_phys(pent))); 937 kmemleak_ignore(pent); 938 *pgcounter = NUM_LV2ENTRIES; 939 handle = dma_map_single(dma_dev, pent, LV2TABLE_SIZE, 940 DMA_TO_DEVICE); 941 if (dma_mapping_error(dma_dev, handle)) { 942 kmem_cache_free(lv2table_kmem_cache, pent); 943 return ERR_PTR(-EADDRINUSE); 944 } 945 946 /* 947 * If pre-fetched SLPD is a faulty SLPD in zero_l2_table, 948 * FLPD cache may cache the address of zero_l2_table. This 949 * function replaces the zero_l2_table with new L2 page table 950 * to write valid mappings. 951 * Accessing the valid area may cause page fault since FLPD 952 * cache may still cache zero_l2_table for the valid area 953 * instead of new L2 page table that has the mapping 954 * information of the valid area. 955 * Thus any replacement of zero_l2_table with other valid L2 956 * page table must involve FLPD cache invalidation for System 957 * MMU v3.3. 958 * FLPD cache invalidation is performed with TLB invalidation 959 * by VPN without blocking. It is safe to invalidate TLB without 960 * blocking because the target address of TLB invalidation is 961 * not currently mapped. 962 */ 963 if (need_flush_flpd_cache) { 964 struct sysmmu_drvdata *data; 965 966 spin_lock(&domain->lock); 967 list_for_each_entry(data, &domain->clients, domain_node) 968 sysmmu_tlb_invalidate_flpdcache(data, iova); 969 spin_unlock(&domain->lock); 970 } 971 } 972 973 return page_entry(sent, iova); 974 } 975 976 static int lv1set_section(struct exynos_iommu_domain *domain, 977 sysmmu_pte_t *sent, sysmmu_iova_t iova, 978 phys_addr_t paddr, int prot, short *pgcnt) 979 { 980 if (lv1ent_section(sent)) { 981 WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", 982 iova); 983 return -EADDRINUSE; 984 } 985 986 if (lv1ent_page(sent)) { 987 if (*pgcnt != NUM_LV2ENTRIES) { 988 WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", 989 iova); 990 return -EADDRINUSE; 991 } 992 993 kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0)); 994 *pgcnt = 0; 995 } 996 997 exynos_iommu_set_pte(sent, mk_lv1ent_sect(paddr, prot)); 998 999 spin_lock(&domain->lock); 1000 if (lv1ent_page_zero(sent)) { 1001 struct sysmmu_drvdata *data; 1002 /* 1003 * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD 1004 * entry by speculative prefetch of SLPD which has no mapping. 1005 */ 1006 list_for_each_entry(data, &domain->clients, domain_node) 1007 sysmmu_tlb_invalidate_flpdcache(data, iova); 1008 } 1009 spin_unlock(&domain->lock); 1010 1011 return 0; 1012 } 1013 1014 static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, 1015 int prot, short *pgcnt) 1016 { 1017 if (size == SPAGE_SIZE) { 1018 if (WARN_ON(!lv2ent_fault(pent))) 1019 return -EADDRINUSE; 1020 1021 exynos_iommu_set_pte(pent, mk_lv2ent_spage(paddr, prot)); 1022 *pgcnt -= 1; 1023 } else { /* size == LPAGE_SIZE */ 1024 int i; 1025 dma_addr_t pent_base = virt_to_phys(pent); 1026 1027 dma_sync_single_for_cpu(dma_dev, pent_base, 1028 sizeof(*pent) * SPAGES_PER_LPAGE, 1029 DMA_TO_DEVICE); 1030 for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { 1031 if (WARN_ON(!lv2ent_fault(pent))) { 1032 if (i > 0) 1033 memset(pent - i, 0, sizeof(*pent) * i); 1034 return -EADDRINUSE; 1035 } 1036 1037 *pent = mk_lv2ent_lpage(paddr, prot); 1038 } 1039 dma_sync_single_for_device(dma_dev, pent_base, 1040 sizeof(*pent) * SPAGES_PER_LPAGE, 1041 DMA_TO_DEVICE); 1042 *pgcnt -= SPAGES_PER_LPAGE; 1043 } 1044 1045 return 0; 1046 } 1047 1048 /* 1049 * *CAUTION* to the I/O virtual memory managers that support exynos-iommu: 1050 * 1051 * System MMU v3.x has advanced logic to improve address translation 1052 * performance with caching more page table entries by a page table walk. 1053 * However, the logic has a bug that while caching faulty page table entries, 1054 * System MMU reports page fault if the cached fault entry is hit even though 1055 * the fault entry is updated to a valid entry after the entry is cached. 1056 * To prevent caching faulty page table entries which may be updated to valid 1057 * entries later, the virtual memory manager should care about the workaround 1058 * for the problem. The following describes the workaround. 1059 * 1060 * Any two consecutive I/O virtual address regions must have a hole of 128KiB 1061 * at maximum to prevent misbehavior of System MMU 3.x (workaround for h/w bug). 1062 * 1063 * Precisely, any start address of I/O virtual region must be aligned with 1064 * the following sizes for System MMU v3.1 and v3.2. 1065 * System MMU v3.1: 128KiB 1066 * System MMU v3.2: 256KiB 1067 * 1068 * Because System MMU v3.3 caches page table entries more aggressively, it needs 1069 * more workarounds. 1070 * - Any two consecutive I/O virtual regions must have a hole of size larger 1071 * than or equal to 128KiB. 1072 * - Start address of an I/O virtual region must be aligned by 128KiB. 1073 */ 1074 static int exynos_iommu_map(struct iommu_domain *iommu_domain, 1075 unsigned long l_iova, phys_addr_t paddr, size_t size, 1076 int prot, gfp_t gfp) 1077 { 1078 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 1079 sysmmu_pte_t *entry; 1080 sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; 1081 unsigned long flags; 1082 int ret = -ENOMEM; 1083 1084 BUG_ON(domain->pgtable == NULL); 1085 prot &= SYSMMU_SUPPORTED_PROT_BITS; 1086 1087 spin_lock_irqsave(&domain->pgtablelock, flags); 1088 1089 entry = section_entry(domain->pgtable, iova); 1090 1091 if (size == SECT_SIZE) { 1092 ret = lv1set_section(domain, entry, iova, paddr, prot, 1093 &domain->lv2entcnt[lv1ent_offset(iova)]); 1094 } else { 1095 sysmmu_pte_t *pent; 1096 1097 pent = alloc_lv2entry(domain, entry, iova, 1098 &domain->lv2entcnt[lv1ent_offset(iova)]); 1099 1100 if (IS_ERR(pent)) 1101 ret = PTR_ERR(pent); 1102 else 1103 ret = lv2set_page(pent, paddr, size, prot, 1104 &domain->lv2entcnt[lv1ent_offset(iova)]); 1105 } 1106 1107 if (ret) 1108 pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n", 1109 __func__, ret, size, iova); 1110 1111 spin_unlock_irqrestore(&domain->pgtablelock, flags); 1112 1113 return ret; 1114 } 1115 1116 static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain, 1117 sysmmu_iova_t iova, size_t size) 1118 { 1119 struct sysmmu_drvdata *data; 1120 unsigned long flags; 1121 1122 spin_lock_irqsave(&domain->lock, flags); 1123 1124 list_for_each_entry(data, &domain->clients, domain_node) 1125 sysmmu_tlb_invalidate_entry(data, iova, size); 1126 1127 spin_unlock_irqrestore(&domain->lock, flags); 1128 } 1129 1130 static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain, 1131 unsigned long l_iova, size_t size, 1132 struct iommu_iotlb_gather *gather) 1133 { 1134 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 1135 sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; 1136 sysmmu_pte_t *ent; 1137 size_t err_pgsize; 1138 unsigned long flags; 1139 1140 BUG_ON(domain->pgtable == NULL); 1141 1142 spin_lock_irqsave(&domain->pgtablelock, flags); 1143 1144 ent = section_entry(domain->pgtable, iova); 1145 1146 if (lv1ent_section(ent)) { 1147 if (WARN_ON(size < SECT_SIZE)) { 1148 err_pgsize = SECT_SIZE; 1149 goto err; 1150 } 1151 1152 /* workaround for h/w bug in System MMU v3.3 */ 1153 exynos_iommu_set_pte(ent, ZERO_LV2LINK); 1154 size = SECT_SIZE; 1155 goto done; 1156 } 1157 1158 if (unlikely(lv1ent_fault(ent))) { 1159 if (size > SECT_SIZE) 1160 size = SECT_SIZE; 1161 goto done; 1162 } 1163 1164 /* lv1ent_page(sent) == true here */ 1165 1166 ent = page_entry(ent, iova); 1167 1168 if (unlikely(lv2ent_fault(ent))) { 1169 size = SPAGE_SIZE; 1170 goto done; 1171 } 1172 1173 if (lv2ent_small(ent)) { 1174 exynos_iommu_set_pte(ent, 0); 1175 size = SPAGE_SIZE; 1176 domain->lv2entcnt[lv1ent_offset(iova)] += 1; 1177 goto done; 1178 } 1179 1180 /* lv1ent_large(ent) == true here */ 1181 if (WARN_ON(size < LPAGE_SIZE)) { 1182 err_pgsize = LPAGE_SIZE; 1183 goto err; 1184 } 1185 1186 dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), 1187 sizeof(*ent) * SPAGES_PER_LPAGE, 1188 DMA_TO_DEVICE); 1189 memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); 1190 dma_sync_single_for_device(dma_dev, virt_to_phys(ent), 1191 sizeof(*ent) * SPAGES_PER_LPAGE, 1192 DMA_TO_DEVICE); 1193 size = LPAGE_SIZE; 1194 domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; 1195 done: 1196 spin_unlock_irqrestore(&domain->pgtablelock, flags); 1197 1198 exynos_iommu_tlb_invalidate_entry(domain, iova, size); 1199 1200 return size; 1201 err: 1202 spin_unlock_irqrestore(&domain->pgtablelock, flags); 1203 1204 pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n", 1205 __func__, size, iova, err_pgsize); 1206 1207 return 0; 1208 } 1209 1210 static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, 1211 dma_addr_t iova) 1212 { 1213 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); 1214 sysmmu_pte_t *entry; 1215 unsigned long flags; 1216 phys_addr_t phys = 0; 1217 1218 spin_lock_irqsave(&domain->pgtablelock, flags); 1219 1220 entry = section_entry(domain->pgtable, iova); 1221 1222 if (lv1ent_section(entry)) { 1223 phys = section_phys(entry) + section_offs(iova); 1224 } else if (lv1ent_page(entry)) { 1225 entry = page_entry(entry, iova); 1226 1227 if (lv2ent_large(entry)) 1228 phys = lpage_phys(entry) + lpage_offs(iova); 1229 else if (lv2ent_small(entry)) 1230 phys = spage_phys(entry) + spage_offs(iova); 1231 } 1232 1233 spin_unlock_irqrestore(&domain->pgtablelock, flags); 1234 1235 return phys; 1236 } 1237 1238 static struct iommu_device *exynos_iommu_probe_device(struct device *dev) 1239 { 1240 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); 1241 struct sysmmu_drvdata *data; 1242 1243 if (!has_sysmmu(dev)) 1244 return ERR_PTR(-ENODEV); 1245 1246 list_for_each_entry(data, &owner->controllers, owner_node) { 1247 /* 1248 * SYSMMU will be runtime activated via device link 1249 * (dependency) to its master device, so there are no 1250 * direct calls to pm_runtime_get/put in this driver. 1251 */ 1252 data->link = device_link_add(dev, data->sysmmu, 1253 DL_FLAG_STATELESS | 1254 DL_FLAG_PM_RUNTIME); 1255 } 1256 1257 /* There is always at least one entry, see exynos_iommu_of_xlate() */ 1258 data = list_first_entry(&owner->controllers, 1259 struct sysmmu_drvdata, owner_node); 1260 1261 return &data->iommu; 1262 } 1263 1264 static void exynos_iommu_release_device(struct device *dev) 1265 { 1266 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); 1267 struct sysmmu_drvdata *data; 1268 1269 if (!has_sysmmu(dev)) 1270 return; 1271 1272 if (owner->domain) { 1273 struct iommu_group *group = iommu_group_get(dev); 1274 1275 if (group) { 1276 WARN_ON(owner->domain != 1277 iommu_group_default_domain(group)); 1278 exynos_iommu_detach_device(owner->domain, dev); 1279 iommu_group_put(group); 1280 } 1281 } 1282 1283 list_for_each_entry(data, &owner->controllers, owner_node) 1284 device_link_del(data->link); 1285 } 1286 1287 static int exynos_iommu_of_xlate(struct device *dev, 1288 struct of_phandle_args *spec) 1289 { 1290 struct platform_device *sysmmu = of_find_device_by_node(spec->np); 1291 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); 1292 struct sysmmu_drvdata *data, *entry; 1293 1294 if (!sysmmu) 1295 return -ENODEV; 1296 1297 data = platform_get_drvdata(sysmmu); 1298 if (!data) 1299 return -ENODEV; 1300 1301 if (!owner) { 1302 owner = kzalloc(sizeof(*owner), GFP_KERNEL); 1303 if (!owner) 1304 return -ENOMEM; 1305 1306 INIT_LIST_HEAD(&owner->controllers); 1307 mutex_init(&owner->rpm_lock); 1308 dev_iommu_priv_set(dev, owner); 1309 } 1310 1311 list_for_each_entry(entry, &owner->controllers, owner_node) 1312 if (entry == data) 1313 return 0; 1314 1315 list_add_tail(&data->owner_node, &owner->controllers); 1316 data->master = dev; 1317 1318 return 0; 1319 } 1320 1321 static const struct iommu_ops exynos_iommu_ops = { 1322 .domain_alloc = exynos_iommu_domain_alloc, 1323 .domain_free = exynos_iommu_domain_free, 1324 .attach_dev = exynos_iommu_attach_device, 1325 .detach_dev = exynos_iommu_detach_device, 1326 .map = exynos_iommu_map, 1327 .unmap = exynos_iommu_unmap, 1328 .iova_to_phys = exynos_iommu_iova_to_phys, 1329 .device_group = generic_device_group, 1330 .probe_device = exynos_iommu_probe_device, 1331 .release_device = exynos_iommu_release_device, 1332 .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, 1333 .of_xlate = exynos_iommu_of_xlate, 1334 }; 1335 1336 static int __init exynos_iommu_init(void) 1337 { 1338 struct device_node *np; 1339 int ret; 1340 1341 np = of_find_matching_node(NULL, sysmmu_of_match); 1342 if (!np) 1343 return 0; 1344 1345 of_node_put(np); 1346 1347 lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", 1348 LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); 1349 if (!lv2table_kmem_cache) { 1350 pr_err("%s: Failed to create kmem cache\n", __func__); 1351 return -ENOMEM; 1352 } 1353 1354 ret = platform_driver_register(&exynos_sysmmu_driver); 1355 if (ret) { 1356 pr_err("%s: Failed to register driver\n", __func__); 1357 goto err_reg_driver; 1358 } 1359 1360 zero_lv2_table = kmem_cache_zalloc(lv2table_kmem_cache, GFP_KERNEL); 1361 if (zero_lv2_table == NULL) { 1362 pr_err("%s: Failed to allocate zero level2 page table\n", 1363 __func__); 1364 ret = -ENOMEM; 1365 goto err_zero_lv2; 1366 } 1367 1368 ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); 1369 if (ret) { 1370 pr_err("%s: Failed to register exynos-iommu driver.\n", 1371 __func__); 1372 goto err_set_iommu; 1373 } 1374 1375 return 0; 1376 err_set_iommu: 1377 kmem_cache_free(lv2table_kmem_cache, zero_lv2_table); 1378 err_zero_lv2: 1379 platform_driver_unregister(&exynos_sysmmu_driver); 1380 err_reg_driver: 1381 kmem_cache_destroy(lv2table_kmem_cache); 1382 return ret; 1383 } 1384 core_initcall(exynos_iommu_init); 1385