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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-block.git] / drivers / iommu / exynos-iommu.c
... / ...
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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_platform.h>
21#include <linux/platform_device.h>
22#include <linux/pm_runtime.h>
23#include <linux/slab.h>
24
25#include "iommu-pages.h"
26
27typedef u32 sysmmu_iova_t;
28typedef u32 sysmmu_pte_t;
29static struct iommu_domain exynos_identity_domain;
30
31/* We do not consider super section mapping (16MB) */
32#define SECT_ORDER 20
33#define LPAGE_ORDER 16
34#define SPAGE_ORDER 12
35
36#define SECT_SIZE (1 << SECT_ORDER)
37#define LPAGE_SIZE (1 << LPAGE_ORDER)
38#define SPAGE_SIZE (1 << SPAGE_ORDER)
39
40#define SECT_MASK (~(SECT_SIZE - 1))
41#define LPAGE_MASK (~(LPAGE_SIZE - 1))
42#define SPAGE_MASK (~(SPAGE_SIZE - 1))
43
44#define lv1ent_fault(sent) ((*(sent) == ZERO_LV2LINK) || \
45 ((*(sent) & 3) == 0) || ((*(sent) & 3) == 3))
46#define lv1ent_zero(sent) (*(sent) == ZERO_LV2LINK)
47#define lv1ent_page_zero(sent) ((*(sent) & 3) == 1)
48#define lv1ent_page(sent) ((*(sent) != ZERO_LV2LINK) && \
49 ((*(sent) & 3) == 1))
50#define lv1ent_section(sent) ((*(sent) & 3) == 2)
51
52#define lv2ent_fault(pent) ((*(pent) & 3) == 0)
53#define lv2ent_small(pent) ((*(pent) & 2) == 2)
54#define lv2ent_large(pent) ((*(pent) & 3) == 1)
55
56/*
57 * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces
58 * v5.0 introduced support for 36bit physical address space by shifting
59 * all page entry values by 4 bits.
60 * All SYSMMU controllers in the system support the address spaces of the same
61 * size, so PG_ENT_SHIFT can be initialized on first SYSMMU probe to proper
62 * value (0 or 4).
63 */
64static short PG_ENT_SHIFT = -1;
65#define SYSMMU_PG_ENT_SHIFT 0
66#define SYSMMU_V5_PG_ENT_SHIFT 4
67
68static const sysmmu_pte_t *LV1_PROT;
69static const sysmmu_pte_t SYSMMU_LV1_PROT[] = {
70 ((0 << 15) | (0 << 10)), /* no access */
71 ((1 << 15) | (1 << 10)), /* IOMMU_READ only */
72 ((0 << 15) | (1 << 10)), /* IOMMU_WRITE not supported, use read/write */
73 ((0 << 15) | (1 << 10)), /* IOMMU_READ | IOMMU_WRITE */
74};
75static const sysmmu_pte_t SYSMMU_V5_LV1_PROT[] = {
76 (0 << 4), /* no access */
77 (1 << 4), /* IOMMU_READ only */
78 (2 << 4), /* IOMMU_WRITE only */
79 (3 << 4), /* IOMMU_READ | IOMMU_WRITE */
80};
81
82static const sysmmu_pte_t *LV2_PROT;
83static const sysmmu_pte_t SYSMMU_LV2_PROT[] = {
84 ((0 << 9) | (0 << 4)), /* no access */
85 ((1 << 9) | (1 << 4)), /* IOMMU_READ only */
86 ((0 << 9) | (1 << 4)), /* IOMMU_WRITE not supported, use read/write */
87 ((0 << 9) | (1 << 4)), /* IOMMU_READ | IOMMU_WRITE */
88};
89static const sysmmu_pte_t SYSMMU_V5_LV2_PROT[] = {
90 (0 << 2), /* no access */
91 (1 << 2), /* IOMMU_READ only */
92 (2 << 2), /* IOMMU_WRITE only */
93 (3 << 2), /* IOMMU_READ | IOMMU_WRITE */
94};
95
96#define SYSMMU_SUPPORTED_PROT_BITS (IOMMU_READ | IOMMU_WRITE)
97
98#define sect_to_phys(ent) (((phys_addr_t) ent) << PG_ENT_SHIFT)
99#define section_phys(sent) (sect_to_phys(*(sent)) & SECT_MASK)
100#define section_offs(iova) (iova & (SECT_SIZE - 1))
101#define lpage_phys(pent) (sect_to_phys(*(pent)) & LPAGE_MASK)
102#define lpage_offs(iova) (iova & (LPAGE_SIZE - 1))
103#define spage_phys(pent) (sect_to_phys(*(pent)) & SPAGE_MASK)
104#define spage_offs(iova) (iova & (SPAGE_SIZE - 1))
105
106#define NUM_LV1ENTRIES 4096
107#define NUM_LV2ENTRIES (SECT_SIZE / SPAGE_SIZE)
108
109static u32 lv1ent_offset(sysmmu_iova_t iova)
110{
111 return iova >> SECT_ORDER;
112}
113
114static u32 lv2ent_offset(sysmmu_iova_t iova)
115{
116 return (iova >> SPAGE_ORDER) & (NUM_LV2ENTRIES - 1);
117}
118
119#define LV1TABLE_SIZE (NUM_LV1ENTRIES * sizeof(sysmmu_pte_t))
120#define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(sysmmu_pte_t))
121
122#define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE)
123#define lv2table_base(sent) (sect_to_phys(*(sent) & 0xFFFFFFC0))
124
125#define mk_lv1ent_sect(pa, prot) ((pa >> PG_ENT_SHIFT) | LV1_PROT[prot] | 2)
126#define mk_lv1ent_page(pa) ((pa >> PG_ENT_SHIFT) | 1)
127#define mk_lv2ent_lpage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 1)
128#define mk_lv2ent_spage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 2)
129
130#define CTRL_ENABLE 0x5
131#define CTRL_BLOCK 0x7
132#define CTRL_DISABLE 0x0
133
134#define CFG_LRU 0x1
135#define CFG_EAP (1 << 2)
136#define CFG_QOS(n) ((n & 0xF) << 7)
137#define CFG_ACGEN (1 << 24) /* System MMU 3.3 only */
138#define CFG_SYSSEL (1 << 22) /* System MMU 3.2 only */
139#define CFG_FLPDCACHE (1 << 20) /* System MMU 3.2+ only */
140
141#define CTRL_VM_ENABLE BIT(0)
142#define CTRL_VM_FAULT_MODE_STALL BIT(3)
143#define CAPA0_CAPA1_EXIST BIT(11)
144#define CAPA1_VCR_ENABLED BIT(14)
145
146/* common registers */
147#define REG_MMU_CTRL 0x000
148#define REG_MMU_CFG 0x004
149#define REG_MMU_STATUS 0x008
150#define REG_MMU_VERSION 0x034
151
152#define MMU_MAJ_VER(val) ((val) >> 7)
153#define MMU_MIN_VER(val) ((val) & 0x7F)
154#define MMU_RAW_VER(reg) (((reg) >> 21) & ((1 << 11) - 1)) /* 11 bits */
155
156#define MAKE_MMU_VER(maj, min) ((((maj) & 0xF) << 7) | ((min) & 0x7F))
157
158/* v1.x - v3.x registers */
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_FAULT_AR_VA 0x070
166#define REG_V5_FAULT_AW_VA 0x080
167
168/* v7.x registers */
169#define REG_V7_CAPA0 0x870
170#define REG_V7_CAPA1 0x874
171#define REG_V7_CTRL_VM 0x8000
172
173#define has_sysmmu(dev) (dev_iommu_priv_get(dev) != NULL)
174
175static struct device *dma_dev;
176static struct kmem_cache *lv2table_kmem_cache;
177static sysmmu_pte_t *zero_lv2_table;
178#define ZERO_LV2LINK mk_lv1ent_page(virt_to_phys(zero_lv2_table))
179
180static sysmmu_pte_t *section_entry(sysmmu_pte_t *pgtable, sysmmu_iova_t iova)
181{
182 return pgtable + lv1ent_offset(iova);
183}
184
185static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova)
186{
187 return (sysmmu_pte_t *)phys_to_virt(
188 lv2table_base(sent)) + lv2ent_offset(iova);
189}
190
191struct sysmmu_fault {
192 sysmmu_iova_t addr; /* IOVA address that caused fault */
193 const char *name; /* human readable fault name */
194 unsigned int type; /* fault type for report_iommu_fault() */
195};
196
197struct sysmmu_v1_fault_info {
198 unsigned short addr_reg; /* register to read IOVA fault address */
199 const char *name; /* human readable fault name */
200 unsigned int type; /* fault type for report_iommu_fault */
201};
202
203static const struct sysmmu_v1_fault_info sysmmu_v1_faults[] = {
204 { REG_PAGE_FAULT_ADDR, "PAGE", IOMMU_FAULT_READ },
205 { REG_AR_FAULT_ADDR, "MULTI-HIT", IOMMU_FAULT_READ },
206 { REG_AW_FAULT_ADDR, "MULTI-HIT", IOMMU_FAULT_WRITE },
207 { REG_DEFAULT_SLAVE_ADDR, "BUS ERROR", IOMMU_FAULT_READ },
208 { REG_AR_FAULT_ADDR, "SECURITY PROTECTION", IOMMU_FAULT_READ },
209 { REG_AR_FAULT_ADDR, "ACCESS PROTECTION", IOMMU_FAULT_READ },
210 { REG_AW_FAULT_ADDR, "SECURITY PROTECTION", IOMMU_FAULT_WRITE },
211 { REG_AW_FAULT_ADDR, "ACCESS PROTECTION", IOMMU_FAULT_WRITE },
212};
213
214/* SysMMU v5 has the same faults for AR (0..4 bits) and AW (16..20 bits) */
215static const char * const sysmmu_v5_fault_names[] = {
216 "PTW",
217 "PAGE",
218 "MULTI-HIT",
219 "ACCESS PROTECTION",
220 "SECURITY PROTECTION"
221};
222
223static const char * const sysmmu_v7_fault_names[] = {
224 "PTW",
225 "PAGE",
226 "ACCESS PROTECTION",
227 "RESERVED"
228};
229
230/*
231 * This structure is attached to dev->iommu->priv of the master device
232 * on device add, contains a list of SYSMMU controllers defined by device tree,
233 * which are bound to given master device. It is usually referenced by 'owner'
234 * pointer.
235*/
236struct exynos_iommu_owner {
237 struct list_head controllers; /* list of sysmmu_drvdata.owner_node */
238 struct iommu_domain *domain; /* domain this device is attached */
239 struct mutex rpm_lock; /* for runtime pm of all sysmmus */
240};
241
242/*
243 * This structure exynos specific generalization of struct iommu_domain.
244 * It contains list of SYSMMU controllers from all master devices, which has
245 * been attached to this domain and page tables of IO address space defined by
246 * it. It is usually referenced by 'domain' pointer.
247 */
248struct exynos_iommu_domain {
249 struct list_head clients; /* list of sysmmu_drvdata.domain_node */
250 sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */
251 short *lv2entcnt; /* free lv2 entry counter for each section */
252 spinlock_t lock; /* lock for modifying list of clients */
253 spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
254 struct iommu_domain domain; /* generic domain data structure */
255};
256
257struct sysmmu_drvdata;
258
259/*
260 * SysMMU version specific data. Contains offsets for the registers which can
261 * be found in different SysMMU variants, but have different offset values.
262 * Also contains version specific callbacks to abstract the hardware.
263 */
264struct sysmmu_variant {
265 u32 pt_base; /* page table base address (physical) */
266 u32 flush_all; /* invalidate all TLB entries */
267 u32 flush_entry; /* invalidate specific TLB entry */
268 u32 flush_range; /* invalidate TLB entries in specified range */
269 u32 flush_start; /* start address of range invalidation */
270 u32 flush_end; /* end address of range invalidation */
271 u32 int_status; /* interrupt status information */
272 u32 int_clear; /* clear the interrupt */
273 u32 fault_va; /* IOVA address that caused fault */
274 u32 fault_info; /* fault transaction info */
275
276 int (*get_fault_info)(struct sysmmu_drvdata *data, unsigned int itype,
277 struct sysmmu_fault *fault);
278};
279
280/*
281 * This structure hold all data of a single SYSMMU controller, this includes
282 * hw resources like registers and clocks, pointers and list nodes to connect
283 * it to all other structures, internal state and parameters read from device
284 * tree. It is usually referenced by 'data' pointer.
285 */
286struct sysmmu_drvdata {
287 struct device *sysmmu; /* SYSMMU controller device */
288 struct device *master; /* master device (owner) */
289 struct device_link *link; /* runtime PM link to master */
290 void __iomem *sfrbase; /* our registers */
291 struct clk *clk; /* SYSMMU's clock */
292 struct clk *aclk; /* SYSMMU's aclk clock */
293 struct clk *pclk; /* SYSMMU's pclk clock */
294 struct clk *clk_master; /* master's device clock */
295 spinlock_t lock; /* lock for modifying state */
296 bool active; /* current status */
297 struct exynos_iommu_domain *domain; /* domain we belong to */
298 struct list_head domain_node; /* node for domain clients list */
299 struct list_head owner_node; /* node for owner controllers list */
300 phys_addr_t pgtable; /* assigned page table structure */
301 unsigned int version; /* our version */
302
303 struct iommu_device iommu; /* IOMMU core handle */
304 const struct sysmmu_variant *variant; /* version specific data */
305
306 /* v7 fields */
307 bool has_vcr; /* virtual machine control register */
308};
309
310#define SYSMMU_REG(data, reg) ((data)->sfrbase + (data)->variant->reg)
311
312static int exynos_sysmmu_v1_get_fault_info(struct sysmmu_drvdata *data,
313 unsigned int itype,
314 struct sysmmu_fault *fault)
315{
316 const struct sysmmu_v1_fault_info *finfo;
317
318 if (itype >= ARRAY_SIZE(sysmmu_v1_faults))
319 return -ENXIO;
320
321 finfo = &sysmmu_v1_faults[itype];
322 fault->addr = readl(data->sfrbase + finfo->addr_reg);
323 fault->name = finfo->name;
324 fault->type = finfo->type;
325
326 return 0;
327}
328
329static int exynos_sysmmu_v5_get_fault_info(struct sysmmu_drvdata *data,
330 unsigned int itype,
331 struct sysmmu_fault *fault)
332{
333 unsigned int addr_reg;
334
335 if (itype < ARRAY_SIZE(sysmmu_v5_fault_names)) {
336 fault->type = IOMMU_FAULT_READ;
337 addr_reg = REG_V5_FAULT_AR_VA;
338 } else if (itype >= 16 && itype <= 20) {
339 fault->type = IOMMU_FAULT_WRITE;
340 addr_reg = REG_V5_FAULT_AW_VA;
341 itype -= 16;
342 } else {
343 return -ENXIO;
344 }
345
346 fault->name = sysmmu_v5_fault_names[itype];
347 fault->addr = readl(data->sfrbase + addr_reg);
348
349 return 0;
350}
351
352static int exynos_sysmmu_v7_get_fault_info(struct sysmmu_drvdata *data,
353 unsigned int itype,
354 struct sysmmu_fault *fault)
355{
356 u32 info = readl(SYSMMU_REG(data, fault_info));
357
358 fault->addr = readl(SYSMMU_REG(data, fault_va));
359 fault->name = sysmmu_v7_fault_names[itype % 4];
360 fault->type = (info & BIT(20)) ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ;
361
362 return 0;
363}
364
365/* SysMMU v1..v3 */
366static const struct sysmmu_variant sysmmu_v1_variant = {
367 .flush_all = 0x0c,
368 .flush_entry = 0x10,
369 .pt_base = 0x14,
370 .int_status = 0x18,
371 .int_clear = 0x1c,
372
373 .get_fault_info = exynos_sysmmu_v1_get_fault_info,
374};
375
376/* SysMMU v5 */
377static const struct sysmmu_variant sysmmu_v5_variant = {
378 .pt_base = 0x0c,
379 .flush_all = 0x10,
380 .flush_entry = 0x14,
381 .flush_range = 0x18,
382 .flush_start = 0x20,
383 .flush_end = 0x24,
384 .int_status = 0x60,
385 .int_clear = 0x64,
386
387 .get_fault_info = exynos_sysmmu_v5_get_fault_info,
388};
389
390/* SysMMU v7: non-VM capable register layout */
391static const struct sysmmu_variant sysmmu_v7_variant = {
392 .pt_base = 0x0c,
393 .flush_all = 0x10,
394 .flush_entry = 0x14,
395 .flush_range = 0x18,
396 .flush_start = 0x20,
397 .flush_end = 0x24,
398 .int_status = 0x60,
399 .int_clear = 0x64,
400 .fault_va = 0x70,
401 .fault_info = 0x78,
402
403 .get_fault_info = exynos_sysmmu_v7_get_fault_info,
404};
405
406/* SysMMU v7: VM capable register layout */
407static const struct sysmmu_variant sysmmu_v7_vm_variant = {
408 .pt_base = 0x800c,
409 .flush_all = 0x8010,
410 .flush_entry = 0x8014,
411 .flush_range = 0x8018,
412 .flush_start = 0x8020,
413 .flush_end = 0x8024,
414 .int_status = 0x60,
415 .int_clear = 0x64,
416 .fault_va = 0x1000,
417 .fault_info = 0x1004,
418
419 .get_fault_info = exynos_sysmmu_v7_get_fault_info,
420};
421
422static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom)
423{
424 return container_of(dom, struct exynos_iommu_domain, domain);
425}
426
427static void sysmmu_unblock(struct sysmmu_drvdata *data)
428{
429 writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);
430}
431
432static bool sysmmu_block(struct sysmmu_drvdata *data)
433{
434 int i = 120;
435
436 writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL);
437 while ((i > 0) && !(readl(data->sfrbase + REG_MMU_STATUS) & 1))
438 --i;
439
440 if (!(readl(data->sfrbase + REG_MMU_STATUS) & 1)) {
441 sysmmu_unblock(data);
442 return false;
443 }
444
445 return true;
446}
447
448static void __sysmmu_tlb_invalidate(struct sysmmu_drvdata *data)
449{
450 writel(0x1, SYSMMU_REG(data, flush_all));
451}
452
453static void __sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
454 sysmmu_iova_t iova, unsigned int num_inv)
455{
456 unsigned int i;
457
458 if (MMU_MAJ_VER(data->version) < 5 || num_inv == 1) {
459 for (i = 0; i < num_inv; i++) {
460 writel((iova & SPAGE_MASK) | 1,
461 SYSMMU_REG(data, flush_entry));
462 iova += SPAGE_SIZE;
463 }
464 } else {
465 writel(iova & SPAGE_MASK, SYSMMU_REG(data, flush_start));
466 writel((iova & SPAGE_MASK) + (num_inv - 1) * SPAGE_SIZE,
467 SYSMMU_REG(data, flush_end));
468 writel(0x1, SYSMMU_REG(data, flush_range));
469 }
470}
471
472static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd)
473{
474 u32 pt_base;
475
476 if (MMU_MAJ_VER(data->version) < 5)
477 pt_base = pgd;
478 else
479 pt_base = pgd >> SPAGE_ORDER;
480
481 writel(pt_base, SYSMMU_REG(data, pt_base));
482 __sysmmu_tlb_invalidate(data);
483}
484
485static void __sysmmu_enable_clocks(struct sysmmu_drvdata *data)
486{
487 BUG_ON(clk_prepare_enable(data->clk_master));
488 BUG_ON(clk_prepare_enable(data->clk));
489 BUG_ON(clk_prepare_enable(data->pclk));
490 BUG_ON(clk_prepare_enable(data->aclk));
491}
492
493static void __sysmmu_disable_clocks(struct sysmmu_drvdata *data)
494{
495 clk_disable_unprepare(data->aclk);
496 clk_disable_unprepare(data->pclk);
497 clk_disable_unprepare(data->clk);
498 clk_disable_unprepare(data->clk_master);
499}
500
501static bool __sysmmu_has_capa1(struct sysmmu_drvdata *data)
502{
503 u32 capa0 = readl(data->sfrbase + REG_V7_CAPA0);
504
505 return capa0 & CAPA0_CAPA1_EXIST;
506}
507
508static void __sysmmu_get_vcr(struct sysmmu_drvdata *data)
509{
510 u32 capa1 = readl(data->sfrbase + REG_V7_CAPA1);
511
512 data->has_vcr = capa1 & CAPA1_VCR_ENABLED;
513}
514
515static void __sysmmu_get_version(struct sysmmu_drvdata *data)
516{
517 u32 ver;
518
519 __sysmmu_enable_clocks(data);
520
521 ver = readl(data->sfrbase + REG_MMU_VERSION);
522
523 /* controllers on some SoCs don't report proper version */
524 if (ver == 0x80000001u)
525 data->version = MAKE_MMU_VER(1, 0);
526 else
527 data->version = MMU_RAW_VER(ver);
528
529 dev_dbg(data->sysmmu, "hardware version: %d.%d\n",
530 MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version));
531
532 if (MMU_MAJ_VER(data->version) < 5) {
533 data->variant = &sysmmu_v1_variant;
534 } else if (MMU_MAJ_VER(data->version) < 7) {
535 data->variant = &sysmmu_v5_variant;
536 } else {
537 if (__sysmmu_has_capa1(data))
538 __sysmmu_get_vcr(data);
539 if (data->has_vcr)
540 data->variant = &sysmmu_v7_vm_variant;
541 else
542 data->variant = &sysmmu_v7_variant;
543 }
544
545 __sysmmu_disable_clocks(data);
546}
547
548static void show_fault_information(struct sysmmu_drvdata *data,
549 const struct sysmmu_fault *fault)
550{
551 sysmmu_pte_t *ent;
552
553 dev_err(data->sysmmu, "%s: [%s] %s FAULT occurred at %#x\n",
554 dev_name(data->master),
555 fault->type == IOMMU_FAULT_READ ? "READ" : "WRITE",
556 fault->name, fault->addr);
557 dev_dbg(data->sysmmu, "Page table base: %pa\n", &data->pgtable);
558 ent = section_entry(phys_to_virt(data->pgtable), fault->addr);
559 dev_dbg(data->sysmmu, "\tLv1 entry: %#x\n", *ent);
560 if (lv1ent_page(ent)) {
561 ent = page_entry(ent, fault->addr);
562 dev_dbg(data->sysmmu, "\t Lv2 entry: %#x\n", *ent);
563 }
564}
565
566static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
567{
568 struct sysmmu_drvdata *data = dev_id;
569 unsigned int itype;
570 struct sysmmu_fault fault;
571 int ret = -ENOSYS;
572
573 WARN_ON(!data->active);
574
575 spin_lock(&data->lock);
576 clk_enable(data->clk_master);
577
578 itype = __ffs(readl(SYSMMU_REG(data, int_status)));
579 ret = data->variant->get_fault_info(data, itype, &fault);
580 if (ret) {
581 dev_err(data->sysmmu, "Unhandled interrupt bit %u\n", itype);
582 goto out;
583 }
584 show_fault_information(data, &fault);
585
586 if (data->domain) {
587 ret = report_iommu_fault(&data->domain->domain, data->master,
588 fault.addr, fault.type);
589 }
590 if (ret)
591 panic("Unrecoverable System MMU Fault!");
592
593out:
594 writel(1 << itype, SYSMMU_REG(data, int_clear));
595
596 /* SysMMU is in blocked state when interrupt occurred */
597 sysmmu_unblock(data);
598 clk_disable(data->clk_master);
599 spin_unlock(&data->lock);
600
601 return IRQ_HANDLED;
602}
603
604static void __sysmmu_disable(struct sysmmu_drvdata *data)
605{
606 unsigned long flags;
607
608 clk_enable(data->clk_master);
609
610 spin_lock_irqsave(&data->lock, flags);
611 writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL);
612 writel(0, data->sfrbase + REG_MMU_CFG);
613 data->active = false;
614 spin_unlock_irqrestore(&data->lock, flags);
615
616 __sysmmu_disable_clocks(data);
617}
618
619static void __sysmmu_init_config(struct sysmmu_drvdata *data)
620{
621 unsigned int cfg;
622
623 if (data->version <= MAKE_MMU_VER(3, 1))
624 cfg = CFG_LRU | CFG_QOS(15);
625 else if (data->version <= MAKE_MMU_VER(3, 2))
626 cfg = CFG_LRU | CFG_QOS(15) | CFG_FLPDCACHE | CFG_SYSSEL;
627 else
628 cfg = CFG_QOS(15) | CFG_FLPDCACHE | CFG_ACGEN;
629
630 cfg |= CFG_EAP; /* enable access protection bits check */
631
632 writel(cfg, data->sfrbase + REG_MMU_CFG);
633}
634
635static void __sysmmu_enable_vid(struct sysmmu_drvdata *data)
636{
637 u32 ctrl;
638
639 if (MMU_MAJ_VER(data->version) < 7 || !data->has_vcr)
640 return;
641
642 ctrl = readl(data->sfrbase + REG_V7_CTRL_VM);
643 ctrl |= CTRL_VM_ENABLE | CTRL_VM_FAULT_MODE_STALL;
644 writel(ctrl, data->sfrbase + REG_V7_CTRL_VM);
645}
646
647static void __sysmmu_enable(struct sysmmu_drvdata *data)
648{
649 unsigned long flags;
650
651 __sysmmu_enable_clocks(data);
652
653 spin_lock_irqsave(&data->lock, flags);
654 writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL);
655 __sysmmu_init_config(data);
656 __sysmmu_set_ptbase(data, data->pgtable);
657 __sysmmu_enable_vid(data);
658 writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);
659 data->active = true;
660 spin_unlock_irqrestore(&data->lock, flags);
661
662 /*
663 * SYSMMU driver keeps master's clock enabled only for the short
664 * time, while accessing the registers. For performing address
665 * translation during DMA transaction it relies on the client
666 * driver to enable it.
667 */
668 clk_disable(data->clk_master);
669}
670
671static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
672 sysmmu_iova_t iova)
673{
674 unsigned long flags;
675
676 spin_lock_irqsave(&data->lock, flags);
677 if (data->active && data->version >= MAKE_MMU_VER(3, 3)) {
678 clk_enable(data->clk_master);
679 if (sysmmu_block(data)) {
680 if (data->version >= MAKE_MMU_VER(5, 0))
681 __sysmmu_tlb_invalidate(data);
682 else
683 __sysmmu_tlb_invalidate_entry(data, iova, 1);
684 sysmmu_unblock(data);
685 }
686 clk_disable(data->clk_master);
687 }
688 spin_unlock_irqrestore(&data->lock, flags);
689}
690
691static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
692 sysmmu_iova_t iova, size_t size)
693{
694 unsigned long flags;
695
696 spin_lock_irqsave(&data->lock, flags);
697 if (data->active) {
698 unsigned int num_inv = 1;
699
700 clk_enable(data->clk_master);
701
702 /*
703 * L2TLB invalidation required
704 * 4KB page: 1 invalidation
705 * 64KB page: 16 invalidations
706 * 1MB page: 64 invalidations
707 * because it is set-associative TLB
708 * with 8-way and 64 sets.
709 * 1MB page can be cached in one of all sets.
710 * 64KB page can be one of 16 consecutive sets.
711 */
712 if (MMU_MAJ_VER(data->version) == 2)
713 num_inv = min_t(unsigned int, size / SPAGE_SIZE, 64);
714
715 if (sysmmu_block(data)) {
716 __sysmmu_tlb_invalidate_entry(data, iova, num_inv);
717 sysmmu_unblock(data);
718 }
719 clk_disable(data->clk_master);
720 }
721 spin_unlock_irqrestore(&data->lock, flags);
722}
723
724static const struct iommu_ops exynos_iommu_ops;
725
726static int exynos_sysmmu_probe(struct platform_device *pdev)
727{
728 int irq, ret;
729 struct device *dev = &pdev->dev;
730 struct sysmmu_drvdata *data;
731 struct resource *res;
732
733 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
734 if (!data)
735 return -ENOMEM;
736
737 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
738 data->sfrbase = devm_ioremap_resource(dev, res);
739 if (IS_ERR(data->sfrbase))
740 return PTR_ERR(data->sfrbase);
741
742 irq = platform_get_irq(pdev, 0);
743 if (irq <= 0)
744 return irq;
745
746 ret = devm_request_irq(dev, irq, exynos_sysmmu_irq, 0,
747 dev_name(dev), data);
748 if (ret) {
749 dev_err(dev, "Unable to register handler of irq %d\n", irq);
750 return ret;
751 }
752
753 data->clk = devm_clk_get_optional(dev, "sysmmu");
754 if (IS_ERR(data->clk))
755 return PTR_ERR(data->clk);
756
757 data->aclk = devm_clk_get_optional(dev, "aclk");
758 if (IS_ERR(data->aclk))
759 return PTR_ERR(data->aclk);
760
761 data->pclk = devm_clk_get_optional(dev, "pclk");
762 if (IS_ERR(data->pclk))
763 return PTR_ERR(data->pclk);
764
765 if (!data->clk && (!data->aclk || !data->pclk)) {
766 dev_err(dev, "Failed to get device clock(s)!\n");
767 return -ENOSYS;
768 }
769
770 data->clk_master = devm_clk_get_optional(dev, "master");
771 if (IS_ERR(data->clk_master))
772 return PTR_ERR(data->clk_master);
773
774 data->sysmmu = dev;
775 spin_lock_init(&data->lock);
776
777 __sysmmu_get_version(data);
778
779 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
780 dev_name(data->sysmmu));
781 if (ret)
782 return ret;
783
784 platform_set_drvdata(pdev, data);
785
786 if (PG_ENT_SHIFT < 0) {
787 if (MMU_MAJ_VER(data->version) < 5) {
788 PG_ENT_SHIFT = SYSMMU_PG_ENT_SHIFT;
789 LV1_PROT = SYSMMU_LV1_PROT;
790 LV2_PROT = SYSMMU_LV2_PROT;
791 } else {
792 PG_ENT_SHIFT = SYSMMU_V5_PG_ENT_SHIFT;
793 LV1_PROT = SYSMMU_V5_LV1_PROT;
794 LV2_PROT = SYSMMU_V5_LV2_PROT;
795 }
796 }
797
798 if (MMU_MAJ_VER(data->version) >= 5) {
799 ret = dma_set_mask(dev, DMA_BIT_MASK(36));
800 if (ret) {
801 dev_err(dev, "Unable to set DMA mask: %d\n", ret);
802 goto err_dma_set_mask;
803 }
804 }
805
806 /*
807 * use the first registered sysmmu device for performing
808 * dma mapping operations on iommu page tables (cpu cache flush)
809 */
810 if (!dma_dev)
811 dma_dev = &pdev->dev;
812
813 pm_runtime_enable(dev);
814
815 ret = iommu_device_register(&data->iommu, &exynos_iommu_ops, dev);
816 if (ret)
817 goto err_dma_set_mask;
818
819 return 0;
820
821err_dma_set_mask:
822 iommu_device_sysfs_remove(&data->iommu);
823 return ret;
824}
825
826static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)
827{
828 struct sysmmu_drvdata *data = dev_get_drvdata(dev);
829 struct device *master = data->master;
830
831 if (master) {
832 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
833
834 mutex_lock(&owner->rpm_lock);
835 if (data->domain) {
836 dev_dbg(data->sysmmu, "saving state\n");
837 __sysmmu_disable(data);
838 }
839 mutex_unlock(&owner->rpm_lock);
840 }
841 return 0;
842}
843
844static int __maybe_unused exynos_sysmmu_resume(struct device *dev)
845{
846 struct sysmmu_drvdata *data = dev_get_drvdata(dev);
847 struct device *master = data->master;
848
849 if (master) {
850 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
851
852 mutex_lock(&owner->rpm_lock);
853 if (data->domain) {
854 dev_dbg(data->sysmmu, "restoring state\n");
855 __sysmmu_enable(data);
856 }
857 mutex_unlock(&owner->rpm_lock);
858 }
859 return 0;
860}
861
862static const struct dev_pm_ops sysmmu_pm_ops = {
863 SET_RUNTIME_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume, NULL)
864 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
865 pm_runtime_force_resume)
866};
867
868static const struct of_device_id sysmmu_of_match[] = {
869 { .compatible = "samsung,exynos-sysmmu", },
870 { },
871};
872
873static struct platform_driver exynos_sysmmu_driver __refdata = {
874 .probe = exynos_sysmmu_probe,
875 .driver = {
876 .name = "exynos-sysmmu",
877 .of_match_table = sysmmu_of_match,
878 .pm = &sysmmu_pm_ops,
879 .suppress_bind_attrs = true,
880 }
881};
882
883static inline void exynos_iommu_set_pte(sysmmu_pte_t *ent, sysmmu_pte_t val)
884{
885 dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), sizeof(*ent),
886 DMA_TO_DEVICE);
887 *ent = cpu_to_le32(val);
888 dma_sync_single_for_device(dma_dev, virt_to_phys(ent), sizeof(*ent),
889 DMA_TO_DEVICE);
890}
891
892static struct iommu_domain *exynos_iommu_domain_alloc_paging(struct device *dev)
893{
894 struct exynos_iommu_domain *domain;
895 dma_addr_t handle;
896 int i;
897
898 /* Check if correct PTE offsets are initialized */
899 BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev);
900
901 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
902 if (!domain)
903 return NULL;
904
905 domain->pgtable = iommu_alloc_pages_sz(GFP_KERNEL, SZ_16K);
906 if (!domain->pgtable)
907 goto err_pgtable;
908
909 domain->lv2entcnt = iommu_alloc_pages_sz(GFP_KERNEL, SZ_8K);
910 if (!domain->lv2entcnt)
911 goto err_counter;
912
913 /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */
914 for (i = 0; i < NUM_LV1ENTRIES; i++)
915 domain->pgtable[i] = ZERO_LV2LINK;
916
917 handle = dma_map_single(dma_dev, domain->pgtable, LV1TABLE_SIZE,
918 DMA_TO_DEVICE);
919 /* For mapping page table entries we rely on dma == phys */
920 BUG_ON(handle != virt_to_phys(domain->pgtable));
921 if (dma_mapping_error(dma_dev, handle))
922 goto err_lv2ent;
923
924 spin_lock_init(&domain->lock);
925 spin_lock_init(&domain->pgtablelock);
926 INIT_LIST_HEAD(&domain->clients);
927
928 domain->domain.geometry.aperture_start = 0;
929 domain->domain.geometry.aperture_end = ~0UL;
930 domain->domain.geometry.force_aperture = true;
931
932 return &domain->domain;
933
934err_lv2ent:
935 iommu_free_pages(domain->lv2entcnt);
936err_counter:
937 iommu_free_pages(domain->pgtable);
938err_pgtable:
939 kfree(domain);
940 return NULL;
941}
942
943static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
944{
945 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
946 struct sysmmu_drvdata *data, *next;
947 unsigned long flags;
948 int i;
949
950 WARN_ON(!list_empty(&domain->clients));
951
952 spin_lock_irqsave(&domain->lock, flags);
953
954 list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
955 spin_lock(&data->lock);
956 __sysmmu_disable(data);
957 data->pgtable = 0;
958 data->domain = NULL;
959 list_del_init(&data->domain_node);
960 spin_unlock(&data->lock);
961 }
962
963 spin_unlock_irqrestore(&domain->lock, flags);
964
965 dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE,
966 DMA_TO_DEVICE);
967
968 for (i = 0; i < NUM_LV1ENTRIES; i++)
969 if (lv1ent_page(domain->pgtable + i)) {
970 phys_addr_t base = lv2table_base(domain->pgtable + i);
971
972 dma_unmap_single(dma_dev, base, LV2TABLE_SIZE,
973 DMA_TO_DEVICE);
974 kmem_cache_free(lv2table_kmem_cache,
975 phys_to_virt(base));
976 }
977
978 iommu_free_pages(domain->pgtable);
979 iommu_free_pages(domain->lv2entcnt);
980 kfree(domain);
981}
982
983static int exynos_iommu_identity_attach(struct iommu_domain *identity_domain,
984 struct device *dev)
985{
986 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
987 struct exynos_iommu_domain *domain;
988 phys_addr_t pagetable;
989 struct sysmmu_drvdata *data, *next;
990 unsigned long flags;
991
992 if (owner->domain == identity_domain)
993 return 0;
994
995 domain = to_exynos_domain(owner->domain);
996 pagetable = virt_to_phys(domain->pgtable);
997
998 mutex_lock(&owner->rpm_lock);
999
1000 list_for_each_entry(data, &owner->controllers, owner_node) {
1001 pm_runtime_get_noresume(data->sysmmu);
1002 if (pm_runtime_active(data->sysmmu))
1003 __sysmmu_disable(data);
1004 pm_runtime_put(data->sysmmu);
1005 }
1006
1007 spin_lock_irqsave(&domain->lock, flags);
1008 list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
1009 spin_lock(&data->lock);
1010 data->pgtable = 0;
1011 data->domain = NULL;
1012 list_del_init(&data->domain_node);
1013 spin_unlock(&data->lock);
1014 }
1015 owner->domain = identity_domain;
1016 spin_unlock_irqrestore(&domain->lock, flags);
1017
1018 mutex_unlock(&owner->rpm_lock);
1019
1020 dev_dbg(dev, "%s: Restored IOMMU to IDENTITY from pgtable %pa\n",
1021 __func__, &pagetable);
1022 return 0;
1023}
1024
1025static struct iommu_domain_ops exynos_identity_ops = {
1026 .attach_dev = exynos_iommu_identity_attach,
1027};
1028
1029static struct iommu_domain exynos_identity_domain = {
1030 .type = IOMMU_DOMAIN_IDENTITY,
1031 .ops = &exynos_identity_ops,
1032};
1033
1034static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
1035 struct device *dev)
1036{
1037 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1038 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1039 struct sysmmu_drvdata *data;
1040 phys_addr_t pagetable = virt_to_phys(domain->pgtable);
1041 unsigned long flags;
1042 int err;
1043
1044 err = exynos_iommu_identity_attach(&exynos_identity_domain, dev);
1045 if (err)
1046 return err;
1047
1048 mutex_lock(&owner->rpm_lock);
1049
1050 spin_lock_irqsave(&domain->lock, flags);
1051 list_for_each_entry(data, &owner->controllers, owner_node) {
1052 spin_lock(&data->lock);
1053 data->pgtable = pagetable;
1054 data->domain = domain;
1055 list_add_tail(&data->domain_node, &domain->clients);
1056 spin_unlock(&data->lock);
1057 }
1058 owner->domain = iommu_domain;
1059 spin_unlock_irqrestore(&domain->lock, flags);
1060
1061 list_for_each_entry(data, &owner->controllers, owner_node) {
1062 pm_runtime_get_noresume(data->sysmmu);
1063 if (pm_runtime_active(data->sysmmu))
1064 __sysmmu_enable(data);
1065 pm_runtime_put(data->sysmmu);
1066 }
1067
1068 mutex_unlock(&owner->rpm_lock);
1069
1070 dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__,
1071 &pagetable);
1072
1073 return 0;
1074}
1075
1076static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain,
1077 sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter)
1078{
1079 if (lv1ent_section(sent)) {
1080 WARN(1, "Trying mapping on %#08x mapped with 1MiB page", iova);
1081 return ERR_PTR(-EADDRINUSE);
1082 }
1083
1084 if (lv1ent_fault(sent)) {
1085 dma_addr_t handle;
1086 sysmmu_pte_t *pent;
1087 bool need_flush_flpd_cache = lv1ent_zero(sent);
1088
1089 pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC);
1090 BUG_ON((uintptr_t)pent & (LV2TABLE_SIZE - 1));
1091 if (!pent)
1092 return ERR_PTR(-ENOMEM);
1093
1094 exynos_iommu_set_pte(sent, mk_lv1ent_page(virt_to_phys(pent)));
1095 kmemleak_ignore(pent);
1096 *pgcounter = NUM_LV2ENTRIES;
1097 handle = dma_map_single(dma_dev, pent, LV2TABLE_SIZE,
1098 DMA_TO_DEVICE);
1099 if (dma_mapping_error(dma_dev, handle)) {
1100 kmem_cache_free(lv2table_kmem_cache, pent);
1101 return ERR_PTR(-EADDRINUSE);
1102 }
1103
1104 /*
1105 * If pre-fetched SLPD is a faulty SLPD in zero_l2_table,
1106 * FLPD cache may cache the address of zero_l2_table. This
1107 * function replaces the zero_l2_table with new L2 page table
1108 * to write valid mappings.
1109 * Accessing the valid area may cause page fault since FLPD
1110 * cache may still cache zero_l2_table for the valid area
1111 * instead of new L2 page table that has the mapping
1112 * information of the valid area.
1113 * Thus any replacement of zero_l2_table with other valid L2
1114 * page table must involve FLPD cache invalidation for System
1115 * MMU v3.3.
1116 * FLPD cache invalidation is performed with TLB invalidation
1117 * by VPN without blocking. It is safe to invalidate TLB without
1118 * blocking because the target address of TLB invalidation is
1119 * not currently mapped.
1120 */
1121 if (need_flush_flpd_cache) {
1122 struct sysmmu_drvdata *data;
1123
1124 spin_lock(&domain->lock);
1125 list_for_each_entry(data, &domain->clients, domain_node)
1126 sysmmu_tlb_invalidate_flpdcache(data, iova);
1127 spin_unlock(&domain->lock);
1128 }
1129 }
1130
1131 return page_entry(sent, iova);
1132}
1133
1134static int lv1set_section(struct exynos_iommu_domain *domain,
1135 sysmmu_pte_t *sent, sysmmu_iova_t iova,
1136 phys_addr_t paddr, int prot, short *pgcnt)
1137{
1138 if (lv1ent_section(sent)) {
1139 WARN(1, "Trying mapping on 1MiB@%#08x that is mapped",
1140 iova);
1141 return -EADDRINUSE;
1142 }
1143
1144 if (lv1ent_page(sent)) {
1145 if (*pgcnt != NUM_LV2ENTRIES) {
1146 WARN(1, "Trying mapping on 1MiB@%#08x that is mapped",
1147 iova);
1148 return -EADDRINUSE;
1149 }
1150
1151 kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0));
1152 *pgcnt = 0;
1153 }
1154
1155 exynos_iommu_set_pte(sent, mk_lv1ent_sect(paddr, prot));
1156
1157 spin_lock(&domain->lock);
1158 if (lv1ent_page_zero(sent)) {
1159 struct sysmmu_drvdata *data;
1160 /*
1161 * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD
1162 * entry by speculative prefetch of SLPD which has no mapping.
1163 */
1164 list_for_each_entry(data, &domain->clients, domain_node)
1165 sysmmu_tlb_invalidate_flpdcache(data, iova);
1166 }
1167 spin_unlock(&domain->lock);
1168
1169 return 0;
1170}
1171
1172static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size,
1173 int prot, short *pgcnt)
1174{
1175 if (size == SPAGE_SIZE) {
1176 if (WARN_ON(!lv2ent_fault(pent)))
1177 return -EADDRINUSE;
1178
1179 exynos_iommu_set_pte(pent, mk_lv2ent_spage(paddr, prot));
1180 *pgcnt -= 1;
1181 } else { /* size == LPAGE_SIZE */
1182 int i;
1183 dma_addr_t pent_base = virt_to_phys(pent);
1184
1185 dma_sync_single_for_cpu(dma_dev, pent_base,
1186 sizeof(*pent) * SPAGES_PER_LPAGE,
1187 DMA_TO_DEVICE);
1188 for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) {
1189 if (WARN_ON(!lv2ent_fault(pent))) {
1190 if (i > 0)
1191 memset(pent - i, 0, sizeof(*pent) * i);
1192 return -EADDRINUSE;
1193 }
1194
1195 *pent = mk_lv2ent_lpage(paddr, prot);
1196 }
1197 dma_sync_single_for_device(dma_dev, pent_base,
1198 sizeof(*pent) * SPAGES_PER_LPAGE,
1199 DMA_TO_DEVICE);
1200 *pgcnt -= SPAGES_PER_LPAGE;
1201 }
1202
1203 return 0;
1204}
1205
1206/*
1207 * *CAUTION* to the I/O virtual memory managers that support exynos-iommu:
1208 *
1209 * System MMU v3.x has advanced logic to improve address translation
1210 * performance with caching more page table entries by a page table walk.
1211 * However, the logic has a bug that while caching faulty page table entries,
1212 * System MMU reports page fault if the cached fault entry is hit even though
1213 * the fault entry is updated to a valid entry after the entry is cached.
1214 * To prevent caching faulty page table entries which may be updated to valid
1215 * entries later, the virtual memory manager should care about the workaround
1216 * for the problem. The following describes the workaround.
1217 *
1218 * Any two consecutive I/O virtual address regions must have a hole of 128KiB
1219 * at maximum to prevent misbehavior of System MMU 3.x (workaround for h/w bug).
1220 *
1221 * Precisely, any start address of I/O virtual region must be aligned with
1222 * the following sizes for System MMU v3.1 and v3.2.
1223 * System MMU v3.1: 128KiB
1224 * System MMU v3.2: 256KiB
1225 *
1226 * Because System MMU v3.3 caches page table entries more aggressively, it needs
1227 * more workarounds.
1228 * - Any two consecutive I/O virtual regions must have a hole of size larger
1229 * than or equal to 128KiB.
1230 * - Start address of an I/O virtual region must be aligned by 128KiB.
1231 */
1232static int exynos_iommu_map(struct iommu_domain *iommu_domain,
1233 unsigned long l_iova, phys_addr_t paddr, size_t size,
1234 size_t count, int prot, gfp_t gfp, size_t *mapped)
1235{
1236 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1237 sysmmu_pte_t *entry;
1238 sysmmu_iova_t iova = (sysmmu_iova_t)l_iova;
1239 unsigned long flags;
1240 int ret = -ENOMEM;
1241
1242 BUG_ON(domain->pgtable == NULL);
1243 prot &= SYSMMU_SUPPORTED_PROT_BITS;
1244
1245 spin_lock_irqsave(&domain->pgtablelock, flags);
1246
1247 entry = section_entry(domain->pgtable, iova);
1248
1249 if (size == SECT_SIZE) {
1250 ret = lv1set_section(domain, entry, iova, paddr, prot,
1251 &domain->lv2entcnt[lv1ent_offset(iova)]);
1252 } else {
1253 sysmmu_pte_t *pent;
1254
1255 pent = alloc_lv2entry(domain, entry, iova,
1256 &domain->lv2entcnt[lv1ent_offset(iova)]);
1257
1258 if (IS_ERR(pent))
1259 ret = PTR_ERR(pent);
1260 else
1261 ret = lv2set_page(pent, paddr, size, prot,
1262 &domain->lv2entcnt[lv1ent_offset(iova)]);
1263 }
1264
1265 if (ret)
1266 pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n",
1267 __func__, ret, size, iova);
1268 else
1269 *mapped = size;
1270
1271 spin_unlock_irqrestore(&domain->pgtablelock, flags);
1272
1273 return ret;
1274}
1275
1276static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain,
1277 sysmmu_iova_t iova, size_t size)
1278{
1279 struct sysmmu_drvdata *data;
1280 unsigned long flags;
1281
1282 spin_lock_irqsave(&domain->lock, flags);
1283
1284 list_for_each_entry(data, &domain->clients, domain_node)
1285 sysmmu_tlb_invalidate_entry(data, iova, size);
1286
1287 spin_unlock_irqrestore(&domain->lock, flags);
1288}
1289
1290static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain,
1291 unsigned long l_iova, size_t size, size_t count,
1292 struct iommu_iotlb_gather *gather)
1293{
1294 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1295 sysmmu_iova_t iova = (sysmmu_iova_t)l_iova;
1296 sysmmu_pte_t *ent;
1297 size_t err_pgsize;
1298 unsigned long flags;
1299
1300 BUG_ON(domain->pgtable == NULL);
1301
1302 spin_lock_irqsave(&domain->pgtablelock, flags);
1303
1304 ent = section_entry(domain->pgtable, iova);
1305
1306 if (lv1ent_section(ent)) {
1307 if (WARN_ON(size < SECT_SIZE)) {
1308 err_pgsize = SECT_SIZE;
1309 goto err;
1310 }
1311
1312 /* workaround for h/w bug in System MMU v3.3 */
1313 exynos_iommu_set_pte(ent, ZERO_LV2LINK);
1314 size = SECT_SIZE;
1315 goto done;
1316 }
1317
1318 if (unlikely(lv1ent_fault(ent))) {
1319 if (size > SECT_SIZE)
1320 size = SECT_SIZE;
1321 goto done;
1322 }
1323
1324 /* lv1ent_page(sent) == true here */
1325
1326 ent = page_entry(ent, iova);
1327
1328 if (unlikely(lv2ent_fault(ent))) {
1329 size = SPAGE_SIZE;
1330 goto done;
1331 }
1332
1333 if (lv2ent_small(ent)) {
1334 exynos_iommu_set_pte(ent, 0);
1335 size = SPAGE_SIZE;
1336 domain->lv2entcnt[lv1ent_offset(iova)] += 1;
1337 goto done;
1338 }
1339
1340 /* lv1ent_large(ent) == true here */
1341 if (WARN_ON(size < LPAGE_SIZE)) {
1342 err_pgsize = LPAGE_SIZE;
1343 goto err;
1344 }
1345
1346 dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent),
1347 sizeof(*ent) * SPAGES_PER_LPAGE,
1348 DMA_TO_DEVICE);
1349 memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
1350 dma_sync_single_for_device(dma_dev, virt_to_phys(ent),
1351 sizeof(*ent) * SPAGES_PER_LPAGE,
1352 DMA_TO_DEVICE);
1353 size = LPAGE_SIZE;
1354 domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
1355done:
1356 spin_unlock_irqrestore(&domain->pgtablelock, flags);
1357
1358 exynos_iommu_tlb_invalidate_entry(domain, iova, size);
1359
1360 return size;
1361err:
1362 spin_unlock_irqrestore(&domain->pgtablelock, flags);
1363
1364 pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n",
1365 __func__, size, iova, err_pgsize);
1366
1367 return 0;
1368}
1369
1370static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain,
1371 dma_addr_t iova)
1372{
1373 struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1374 sysmmu_pte_t *entry;
1375 unsigned long flags;
1376 phys_addr_t phys = 0;
1377
1378 spin_lock_irqsave(&domain->pgtablelock, flags);
1379
1380 entry = section_entry(domain->pgtable, iova);
1381
1382 if (lv1ent_section(entry)) {
1383 phys = section_phys(entry) + section_offs(iova);
1384 } else if (lv1ent_page(entry)) {
1385 entry = page_entry(entry, iova);
1386
1387 if (lv2ent_large(entry))
1388 phys = lpage_phys(entry) + lpage_offs(iova);
1389 else if (lv2ent_small(entry))
1390 phys = spage_phys(entry) + spage_offs(iova);
1391 }
1392
1393 spin_unlock_irqrestore(&domain->pgtablelock, flags);
1394
1395 return phys;
1396}
1397
1398static struct iommu_device *exynos_iommu_probe_device(struct device *dev)
1399{
1400 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1401 struct sysmmu_drvdata *data;
1402
1403 if (!has_sysmmu(dev))
1404 return ERR_PTR(-ENODEV);
1405
1406 list_for_each_entry(data, &owner->controllers, owner_node) {
1407 /*
1408 * SYSMMU will be runtime activated via device link
1409 * (dependency) to its master device, so there are no
1410 * direct calls to pm_runtime_get/put in this driver.
1411 */
1412 data->link = device_link_add(dev, data->sysmmu,
1413 DL_FLAG_STATELESS |
1414 DL_FLAG_PM_RUNTIME);
1415 }
1416
1417 /* There is always at least one entry, see exynos_iommu_of_xlate() */
1418 data = list_first_entry(&owner->controllers,
1419 struct sysmmu_drvdata, owner_node);
1420
1421 return &data->iommu;
1422}
1423
1424static void exynos_iommu_release_device(struct device *dev)
1425{
1426 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1427 struct sysmmu_drvdata *data;
1428
1429 WARN_ON(exynos_iommu_identity_attach(&exynos_identity_domain, dev));
1430
1431 list_for_each_entry(data, &owner->controllers, owner_node)
1432 device_link_del(data->link);
1433}
1434
1435static int exynos_iommu_of_xlate(struct device *dev,
1436 const struct of_phandle_args *spec)
1437{
1438 struct platform_device *sysmmu = of_find_device_by_node(spec->np);
1439 struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1440 struct sysmmu_drvdata *data, *entry;
1441
1442 if (!sysmmu)
1443 return -ENODEV;
1444
1445 data = platform_get_drvdata(sysmmu);
1446 if (!data) {
1447 put_device(&sysmmu->dev);
1448 return -ENODEV;
1449 }
1450
1451 if (!owner) {
1452 owner = kzalloc(sizeof(*owner), GFP_KERNEL);
1453 if (!owner) {
1454 put_device(&sysmmu->dev);
1455 return -ENOMEM;
1456 }
1457
1458 INIT_LIST_HEAD(&owner->controllers);
1459 mutex_init(&owner->rpm_lock);
1460 owner->domain = &exynos_identity_domain;
1461 dev_iommu_priv_set(dev, owner);
1462 }
1463
1464 list_for_each_entry(entry, &owner->controllers, owner_node)
1465 if (entry == data)
1466 return 0;
1467
1468 list_add_tail(&data->owner_node, &owner->controllers);
1469 data->master = dev;
1470
1471 return 0;
1472}
1473
1474static const struct iommu_ops exynos_iommu_ops = {
1475 .identity_domain = &exynos_identity_domain,
1476 .domain_alloc_paging = exynos_iommu_domain_alloc_paging,
1477 .device_group = generic_device_group,
1478 .probe_device = exynos_iommu_probe_device,
1479 .release_device = exynos_iommu_release_device,
1480 .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
1481 .of_xlate = exynos_iommu_of_xlate,
1482 .default_domain_ops = &(const struct iommu_domain_ops) {
1483 .attach_dev = exynos_iommu_attach_device,
1484 .map_pages = exynos_iommu_map,
1485 .unmap_pages = exynos_iommu_unmap,
1486 .iova_to_phys = exynos_iommu_iova_to_phys,
1487 .free = exynos_iommu_domain_free,
1488 }
1489};
1490
1491static int __init exynos_iommu_init(void)
1492{
1493 struct device_node *np;
1494 int ret;
1495
1496 np = of_find_matching_node(NULL, sysmmu_of_match);
1497 if (!np)
1498 return 0;
1499
1500 of_node_put(np);
1501
1502 lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table",
1503 LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL);
1504 if (!lv2table_kmem_cache) {
1505 pr_err("%s: Failed to create kmem cache\n", __func__);
1506 return -ENOMEM;
1507 }
1508
1509 zero_lv2_table = kmem_cache_zalloc(lv2table_kmem_cache, GFP_KERNEL);
1510 if (zero_lv2_table == NULL) {
1511 pr_err("%s: Failed to allocate zero level2 page table\n",
1512 __func__);
1513 ret = -ENOMEM;
1514 goto err_zero_lv2;
1515 }
1516
1517 ret = platform_driver_register(&exynos_sysmmu_driver);
1518 if (ret) {
1519 pr_err("%s: Failed to register driver\n", __func__);
1520 goto err_reg_driver;
1521 }
1522
1523 return 0;
1524err_reg_driver:
1525 kmem_cache_free(lv2table_kmem_cache, zero_lv2_table);
1526err_zero_lv2:
1527 kmem_cache_destroy(lv2table_kmem_cache);
1528 return ret;
1529}
1530core_initcall(exynos_iommu_init);
Linux 6.x block layer and io_uring tree(s)