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20#define pr_fmt(fmt) "%s(): " fmt, __func__
21
22#include <linux/err.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/spinlock.h>
26#include <linux/slab.h>
27#include <linux/vmalloc.h>
28#include <linux/mm.h>
29#include <linux/pagemap.h>
30#include <linux/device.h>
31#include <linux/sched.h>
32#include <linux/iommu.h>
33#include <linux/io.h>
34#include <linux/of.h>
35#include <linux/of_iommu.h>
36#include <linux/debugfs.h>
37#include <linux/seq_file.h>
38#include <linux/tegra-ahb.h>
39
40#include <asm/page.h>
41#include <asm/cacheflush.h>
42
43enum smmu_hwgrp {
44 HWGRP_AFI,
45 HWGRP_AVPC,
46 HWGRP_DC,
47 HWGRP_DCB,
48 HWGRP_EPP,
49 HWGRP_G2,
50 HWGRP_HC,
51 HWGRP_HDA,
52 HWGRP_ISP,
53 HWGRP_MPE,
54 HWGRP_NV,
55 HWGRP_NV2,
56 HWGRP_PPCS,
57 HWGRP_SATA,
58 HWGRP_VDE,
59 HWGRP_VI,
60
61 HWGRP_COUNT,
62
63 HWGRP_END = ~0,
64};
65
66#define HWG_AFI (1 << HWGRP_AFI)
67#define HWG_AVPC (1 << HWGRP_AVPC)
68#define HWG_DC (1 << HWGRP_DC)
69#define HWG_DCB (1 << HWGRP_DCB)
70#define HWG_EPP (1 << HWGRP_EPP)
71#define HWG_G2 (1 << HWGRP_G2)
72#define HWG_HC (1 << HWGRP_HC)
73#define HWG_HDA (1 << HWGRP_HDA)
74#define HWG_ISP (1 << HWGRP_ISP)
75#define HWG_MPE (1 << HWGRP_MPE)
76#define HWG_NV (1 << HWGRP_NV)
77#define HWG_NV2 (1 << HWGRP_NV2)
78#define HWG_PPCS (1 << HWGRP_PPCS)
79#define HWG_SATA (1 << HWGRP_SATA)
80#define HWG_VDE (1 << HWGRP_VDE)
81#define HWG_VI (1 << HWGRP_VI)
82
83
84#define SMMU_IOMMU_PGSIZES (SZ_4K)
85
86#define SMMU_CONFIG 0x10
87#define SMMU_CONFIG_DISABLE 0
88#define SMMU_CONFIG_ENABLE 1
89
90
91enum {
92 _MC = 0,
93};
94
95enum {
96 _TLB = 0,
97 _PTC,
98};
99
100#define SMMU_CACHE_CONFIG_BASE 0x14
101#define __SMMU_CACHE_CONFIG(mc, cache) (SMMU_CACHE_CONFIG_BASE + 4 * cache)
102#define SMMU_CACHE_CONFIG(cache) __SMMU_CACHE_CONFIG(_MC, cache)
103
104#define SMMU_CACHE_CONFIG_STATS_SHIFT 31
105#define SMMU_CACHE_CONFIG_STATS_ENABLE (1 << SMMU_CACHE_CONFIG_STATS_SHIFT)
106#define SMMU_CACHE_CONFIG_STATS_TEST_SHIFT 30
107#define SMMU_CACHE_CONFIG_STATS_TEST (1 << SMMU_CACHE_CONFIG_STATS_TEST_SHIFT)
108
109#define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE (1 << 29)
110#define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE 0x10
111#define SMMU_TLB_CONFIG_RESET_VAL 0x20000010
112
113#define SMMU_PTC_CONFIG_CACHE__ENABLE (1 << 29)
114#define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN 0x3f
115#define SMMU_PTC_CONFIG_RESET_VAL 0x2000003f
116
117#define SMMU_PTB_ASID 0x1c
118#define SMMU_PTB_ASID_CURRENT_SHIFT 0
119
120#define SMMU_PTB_DATA 0x20
121#define SMMU_PTB_DATA_RESET_VAL 0
122#define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT 29
123#define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT 30
124#define SMMU_PTB_DATA_ASID_READABLE_SHIFT 31
125
126#define SMMU_TLB_FLUSH 0x30
127#define SMMU_TLB_FLUSH_VA_MATCH_ALL 0
128#define SMMU_TLB_FLUSH_VA_MATCH_SECTION 2
129#define SMMU_TLB_FLUSH_VA_MATCH_GROUP 3
130#define SMMU_TLB_FLUSH_ASID_SHIFT 29
131#define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE 0
132#define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE 1
133#define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT 31
134
135#define SMMU_PTC_FLUSH 0x34
136#define SMMU_PTC_FLUSH_TYPE_ALL 0
137#define SMMU_PTC_FLUSH_TYPE_ADR 1
138#define SMMU_PTC_FLUSH_ADR_SHIFT 4
139
140#define SMMU_ASID_SECURITY 0x38
141
142#define SMMU_STATS_CACHE_COUNT_BASE 0x1f0
143
144#define SMMU_STATS_CACHE_COUNT(mc, cache, hitmiss) \
145 (SMMU_STATS_CACHE_COUNT_BASE + 8 * cache + 4 * hitmiss)
146
147#define SMMU_TRANSLATION_ENABLE_0 0x228
148#define SMMU_TRANSLATION_ENABLE_1 0x22c
149#define SMMU_TRANSLATION_ENABLE_2 0x230
150
151#define SMMU_AFI_ASID 0x238
152#define SMMU_AVPC_ASID 0x23c
153#define SMMU_DC_ASID 0x240
154#define SMMU_DCB_ASID 0x244
155#define SMMU_EPP_ASID 0x248
156#define SMMU_G2_ASID 0x24c
157#define SMMU_HC_ASID 0x250
158#define SMMU_HDA_ASID 0x254
159#define SMMU_ISP_ASID 0x258
160#define SMMU_MPE_ASID 0x264
161#define SMMU_NV_ASID 0x268
162#define SMMU_NV2_ASID 0x26c
163#define SMMU_PPCS_ASID 0x270
164#define SMMU_SATA_ASID 0x278
165#define SMMU_VDE_ASID 0x27c
166#define SMMU_VI_ASID 0x280
167
168#define SMMU_PDE_NEXT_SHIFT 28
169
170#define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000
171#define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12
172#define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000
173#define SMMU_TLB_FLUSH_VA_GROUP__SHIFT 12
174#define SMMU_TLB_FLUSH_VA(iova, which) \
175 ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \
176 SMMU_TLB_FLUSH_VA_##which##__SHIFT) | \
177 SMMU_TLB_FLUSH_VA_MATCH_##which)
178#define SMMU_PTB_ASID_CUR(n) \
179 ((n) << SMMU_PTB_ASID_CURRENT_SHIFT)
180#define SMMU_TLB_FLUSH_ASID_MATCH_disable \
181 (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE << \
182 SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
183#define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE \
184 (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE << \
185 SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
186
187#define SMMU_PAGE_SHIFT 12
188#define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT)
189#define SMMU_PAGE_MASK ((1 << SMMU_PAGE_SHIFT) - 1)
190
191#define SMMU_PDIR_COUNT 1024
192#define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT)
193#define SMMU_PTBL_COUNT 1024
194#define SMMU_PTBL_SIZE (sizeof(unsigned long) * SMMU_PTBL_COUNT)
195#define SMMU_PDIR_SHIFT 12
196#define SMMU_PDE_SHIFT 12
197#define SMMU_PTE_SHIFT 12
198#define SMMU_PFN_MASK 0x000fffff
199
200#define SMMU_ADDR_TO_PFN(addr) ((addr) >> 12)
201#define SMMU_ADDR_TO_PDN(addr) ((addr) >> 22)
202#define SMMU_PDN_TO_ADDR(pdn) ((pdn) << 22)
203
204#define _READABLE (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT)
205#define _WRITABLE (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT)
206#define _NONSECURE (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT)
207#define _PDE_NEXT (1 << SMMU_PDE_NEXT_SHIFT)
208#define _MASK_ATTR (_READABLE | _WRITABLE | _NONSECURE)
209
210#define _PDIR_ATTR (_READABLE | _WRITABLE | _NONSECURE)
211
212#define _PDE_ATTR (_READABLE | _WRITABLE | _NONSECURE)
213#define _PDE_ATTR_N (_PDE_ATTR | _PDE_NEXT)
214#define _PDE_VACANT(pdn) (((pdn) << 10) | _PDE_ATTR)
215
216#define _PTE_ATTR (_READABLE | _WRITABLE | _NONSECURE)
217#define _PTE_VACANT(addr) (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR)
218
219#define SMMU_MK_PDIR(page, attr) \
220 ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr))
221#define SMMU_MK_PDE(page, attr) \
222 (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr))
223#define SMMU_EX_PTBL_PAGE(pde) \
224 pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK)
225#define SMMU_PFN_TO_PTE(pfn, attr) (unsigned long)((pfn) | (attr))
226
227#define SMMU_ASID_ENABLE(asid) ((asid) | (1 << 31))
228#define SMMU_ASID_DISABLE 0
229#define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0))
230
231#define NUM_SMMU_REG_BANKS 3
232
233#define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1)
234#define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0)
235#define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1)
236#define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0)
237
238#define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID
239
240static const u32 smmu_hwgrp_asid_reg[] = {
241 HWGRP_INIT(AFI),
242 HWGRP_INIT(AVPC),
243 HWGRP_INIT(DC),
244 HWGRP_INIT(DCB),
245 HWGRP_INIT(EPP),
246 HWGRP_INIT(G2),
247 HWGRP_INIT(HC),
248 HWGRP_INIT(HDA),
249 HWGRP_INIT(ISP),
250 HWGRP_INIT(MPE),
251 HWGRP_INIT(NV),
252 HWGRP_INIT(NV2),
253 HWGRP_INIT(PPCS),
254 HWGRP_INIT(SATA),
255 HWGRP_INIT(VDE),
256 HWGRP_INIT(VI),
257};
258#define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x])
259
260
261
262
263struct smmu_client {
264 struct device *dev;
265 struct list_head list;
266 struct smmu_as *as;
267 u32 hwgrp;
268};
269
270
271
272
273struct smmu_as {
274 struct smmu_device *smmu;
275 unsigned int asid;
276 spinlock_t lock;
277 struct page *pdir_page;
278 unsigned long pdir_attr;
279 unsigned long pde_attr;
280 unsigned long pte_attr;
281 unsigned int *pte_count;
282
283 struct list_head client;
284 spinlock_t client_lock;
285};
286
287struct smmu_debugfs_info {
288 struct smmu_device *smmu;
289 int mc;
290 int cache;
291};
292
293
294
295
296struct smmu_device {
297 void __iomem *regbase;
298 void __iomem **regs;
299 void __iomem **rege;
300 int nregs;
301
302 unsigned long iovmm_base;
303 unsigned long page_count;
304 spinlock_t lock;
305 char *name;
306 struct device *dev;
307 struct page *avp_vector_page;
308
309
310
311
312 unsigned long translation_enable_0;
313 unsigned long translation_enable_1;
314 unsigned long translation_enable_2;
315 unsigned long asid_security;
316
317 struct dentry *debugfs_root;
318 struct smmu_debugfs_info *debugfs_info;
319
320 struct device_node *ahb;
321
322 int num_as;
323 struct smmu_as as[0];
324};
325
326static struct smmu_device *smmu_handle;
327
328
329
330
331static bool inline smmu_valid_reg(struct smmu_device *smmu,
332 void __iomem *addr)
333{
334 int i;
335
336 for (i = 0; i < smmu->nregs; i++) {
337 if (addr < smmu->regs[i])
338 break;
339 if (addr <= smmu->rege[i])
340 return true;
341 }
342
343 return false;
344}
345
346static inline u32 smmu_read(struct smmu_device *smmu, size_t offs)
347{
348 void __iomem *addr = smmu->regbase + offs;
349
350 BUG_ON(!smmu_valid_reg(smmu, addr));
351
352 return readl(addr);
353}
354
355static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
356{
357 void __iomem *addr = smmu->regbase + offs;
358
359 BUG_ON(!smmu_valid_reg(smmu, addr));
360
361 writel(val, addr);
362}
363
364#define VA_PAGE_TO_PA(va, page) \
365 (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK))
366
367#define FLUSH_CPU_DCACHE(va, page, size) \
368 do { \
369 unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \
370 __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \
371 outer_flush_range(_pa_, _pa_+(size_t)(size)); \
372 } while (0)
373
374
375
376
377
378
379
380#define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG)
381
382#define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data)
383
384static int __smmu_client_set_hwgrp(struct smmu_client *c,
385 unsigned long map, int on)
386{
387 int i;
388 struct smmu_as *as = c->as;
389 u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid);
390 struct smmu_device *smmu = as->smmu;
391
392 WARN_ON(!on && map);
393 if (on && !map)
394 return -EINVAL;
395 if (!on)
396 map = smmu_client_hwgrp(c);
397
398 for_each_set_bit(i, &map, HWGRP_COUNT) {
399 offs = HWGRP_ASID_REG(i);
400 val = smmu_read(smmu, offs);
401 if (on) {
402 if (WARN_ON(val & mask))
403 goto err_hw_busy;
404 val |= mask;
405 } else {
406 WARN_ON((val & mask) == mask);
407 val &= ~mask;
408 }
409 smmu_write(smmu, val, offs);
410 }
411 FLUSH_SMMU_REGS(smmu);
412 c->hwgrp = map;
413 return 0;
414
415err_hw_busy:
416 for_each_set_bit(i, &map, HWGRP_COUNT) {
417 offs = HWGRP_ASID_REG(i);
418 val = smmu_read(smmu, offs);
419 val &= ~mask;
420 smmu_write(smmu, val, offs);
421 }
422 return -EBUSY;
423}
424
425static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on)
426{
427 u32 val;
428 unsigned long flags;
429 struct smmu_as *as = c->as;
430 struct smmu_device *smmu = as->smmu;
431
432 spin_lock_irqsave(&smmu->lock, flags);
433 val = __smmu_client_set_hwgrp(c, map, on);
434 spin_unlock_irqrestore(&smmu->lock, flags);
435 return val;
436}
437
438
439
440
441
442static void smmu_flush_regs(struct smmu_device *smmu, int enable)
443{
444 u32 val;
445
446 smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
447 FLUSH_SMMU_REGS(smmu);
448 val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
449 SMMU_TLB_FLUSH_ASID_MATCH_disable;
450 smmu_write(smmu, val, SMMU_TLB_FLUSH);
451
452 if (enable)
453 smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
454 FLUSH_SMMU_REGS(smmu);
455}
456
457static int smmu_setup_regs(struct smmu_device *smmu)
458{
459 int i;
460 u32 val;
461
462 for (i = 0; i < smmu->num_as; i++) {
463 struct smmu_as *as = &smmu->as[i];
464 struct smmu_client *c;
465
466 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
467 val = as->pdir_page ?
468 SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) :
469 SMMU_PTB_DATA_RESET_VAL;
470 smmu_write(smmu, val, SMMU_PTB_DATA);
471
472 list_for_each_entry(c, &as->client, list)
473 __smmu_client_set_hwgrp(c, c->hwgrp, 1);
474 }
475
476 smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0);
477 smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1);
478 smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2);
479 smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY);
480 smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_TLB));
481 smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_PTC));
482
483 smmu_flush_regs(smmu, 1);
484
485 return tegra_ahb_enable_smmu(smmu->ahb);
486}
487
488static void flush_ptc_and_tlb(struct smmu_device *smmu,
489 struct smmu_as *as, dma_addr_t iova,
490 unsigned long *pte, struct page *page, int is_pde)
491{
492 u32 val;
493 unsigned long tlb_flush_va = is_pde
494 ? SMMU_TLB_FLUSH_VA(iova, SECTION)
495 : SMMU_TLB_FLUSH_VA(iova, GROUP);
496
497 val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page);
498 smmu_write(smmu, val, SMMU_PTC_FLUSH);
499 FLUSH_SMMU_REGS(smmu);
500 val = tlb_flush_va |
501 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
502 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
503 smmu_write(smmu, val, SMMU_TLB_FLUSH);
504 FLUSH_SMMU_REGS(smmu);
505}
506
507static void free_ptbl(struct smmu_as *as, dma_addr_t iova)
508{
509 unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
510 unsigned long *pdir = (unsigned long *)page_address(as->pdir_page);
511
512 if (pdir[pdn] != _PDE_VACANT(pdn)) {
513 dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn);
514
515 ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn]));
516 __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn]));
517 pdir[pdn] = _PDE_VACANT(pdn);
518 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
519 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
520 as->pdir_page, 1);
521 }
522}
523
524static void free_pdir(struct smmu_as *as)
525{
526 unsigned addr;
527 int count;
528 struct device *dev = as->smmu->dev;
529
530 if (!as->pdir_page)
531 return;
532
533 addr = as->smmu->iovmm_base;
534 count = as->smmu->page_count;
535 while (count-- > 0) {
536 free_ptbl(as, addr);
537 addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT;
538 }
539 ClearPageReserved(as->pdir_page);
540 __free_page(as->pdir_page);
541 as->pdir_page = NULL;
542 devm_kfree(dev, as->pte_count);
543 as->pte_count = NULL;
544}
545
546
547
548
549
550static unsigned long *locate_pte(struct smmu_as *as,
551 dma_addr_t iova, bool allocate,
552 struct page **ptbl_page_p,
553 unsigned int **count)
554{
555 unsigned long ptn = SMMU_ADDR_TO_PFN(iova);
556 unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
557 unsigned long *pdir = page_address(as->pdir_page);
558 unsigned long *ptbl;
559
560 if (pdir[pdn] != _PDE_VACANT(pdn)) {
561
562 *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]);
563 ptbl = page_address(*ptbl_page_p);
564 } else if (!allocate) {
565 return NULL;
566 } else {
567 int pn;
568 unsigned long addr = SMMU_PDN_TO_ADDR(pdn);
569
570
571 dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn);
572
573 *ptbl_page_p = alloc_page(GFP_ATOMIC);
574 if (!*ptbl_page_p) {
575 dev_err(as->smmu->dev,
576 "failed to allocate smmu_device page table\n");
577 return NULL;
578 }
579 SetPageReserved(*ptbl_page_p);
580 ptbl = (unsigned long *)page_address(*ptbl_page_p);
581 for (pn = 0; pn < SMMU_PTBL_COUNT;
582 pn++, addr += SMMU_PAGE_SIZE) {
583 ptbl[pn] = _PTE_VACANT(addr);
584 }
585 FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE);
586 pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p,
587 as->pde_attr | _PDE_NEXT);
588 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
589 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
590 as->pdir_page, 1);
591 }
592 *count = &as->pte_count[pdn];
593
594 return &ptbl[ptn % SMMU_PTBL_COUNT];
595}
596
597#ifdef CONFIG_SMMU_SIG_DEBUG
598static void put_signature(struct smmu_as *as,
599 dma_addr_t iova, unsigned long pfn)
600{
601 struct page *page;
602 unsigned long *vaddr;
603
604 page = pfn_to_page(pfn);
605 vaddr = page_address(page);
606 if (!vaddr)
607 return;
608
609 vaddr[0] = iova;
610 vaddr[1] = pfn << PAGE_SHIFT;
611 FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2);
612}
613#else
614static inline void put_signature(struct smmu_as *as,
615 unsigned long addr, unsigned long pfn)
616{
617}
618#endif
619
620
621
622
623static int alloc_pdir(struct smmu_as *as)
624{
625 unsigned long *pdir, flags;
626 int pdn, err = 0;
627 u32 val;
628 struct smmu_device *smmu = as->smmu;
629 struct page *page;
630 unsigned int *cnt;
631
632
633
634
635 cnt = devm_kzalloc(smmu->dev,
636 sizeof(cnt[0]) * SMMU_PDIR_COUNT,
637 GFP_KERNEL);
638 page = alloc_page(GFP_KERNEL | __GFP_DMA);
639
640 spin_lock_irqsave(&as->lock, flags);
641
642 if (as->pdir_page) {
643
644 err = -EAGAIN;
645 goto err_out;
646 }
647
648 if (!page || !cnt) {
649 dev_err(smmu->dev, "failed to allocate at %s\n", __func__);
650 err = -ENOMEM;
651 goto err_out;
652 }
653
654 as->pdir_page = page;
655 as->pte_count = cnt;
656
657 SetPageReserved(as->pdir_page);
658 pdir = page_address(as->pdir_page);
659
660 for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++)
661 pdir[pdn] = _PDE_VACANT(pdn);
662 FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE);
663 val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page);
664 smmu_write(smmu, val, SMMU_PTC_FLUSH);
665 FLUSH_SMMU_REGS(as->smmu);
666 val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
667 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
668 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
669 smmu_write(smmu, val, SMMU_TLB_FLUSH);
670 FLUSH_SMMU_REGS(as->smmu);
671
672 spin_unlock_irqrestore(&as->lock, flags);
673
674 return 0;
675
676err_out:
677 spin_unlock_irqrestore(&as->lock, flags);
678
679 devm_kfree(smmu->dev, cnt);
680 if (page)
681 __free_page(page);
682 return err;
683}
684
685static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova)
686{
687 unsigned long *pte;
688 struct page *page;
689 unsigned int *count;
690
691 pte = locate_pte(as, iova, false, &page, &count);
692 if (WARN_ON(!pte))
693 return;
694
695 if (WARN_ON(*pte == _PTE_VACANT(iova)))
696 return;
697
698 *pte = _PTE_VACANT(iova);
699 FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
700 flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
701 if (!--(*count))
702 free_ptbl(as, iova);
703}
704
705static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova,
706 unsigned long pfn)
707{
708 struct smmu_device *smmu = as->smmu;
709 unsigned long *pte;
710 unsigned int *count;
711 struct page *page;
712
713 pte = locate_pte(as, iova, true, &page, &count);
714 if (WARN_ON(!pte))
715 return;
716
717 if (*pte == _PTE_VACANT(iova))
718 (*count)++;
719 *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr);
720 if (unlikely((*pte == _PTE_VACANT(iova))))
721 (*count)--;
722 FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
723 flush_ptc_and_tlb(smmu, as, iova, pte, page, 0);
724 put_signature(as, iova, pfn);
725}
726
727static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova,
728 phys_addr_t pa, size_t bytes, int prot)
729{
730 struct smmu_as *as = domain->priv;
731 unsigned long pfn = __phys_to_pfn(pa);
732 unsigned long flags;
733
734 dev_dbg(as->smmu->dev, "[%d] %08lx:%08x\n", as->asid, iova, pa);
735
736 if (!pfn_valid(pfn))
737 return -ENOMEM;
738
739 spin_lock_irqsave(&as->lock, flags);
740 __smmu_iommu_map_pfn(as, iova, pfn);
741 spin_unlock_irqrestore(&as->lock, flags);
742 return 0;
743}
744
745static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
746 size_t bytes)
747{
748 struct smmu_as *as = domain->priv;
749 unsigned long flags;
750
751 dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova);
752
753 spin_lock_irqsave(&as->lock, flags);
754 __smmu_iommu_unmap(as, iova);
755 spin_unlock_irqrestore(&as->lock, flags);
756 return SMMU_PAGE_SIZE;
757}
758
759static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain,
760 dma_addr_t iova)
761{
762 struct smmu_as *as = domain->priv;
763 unsigned long *pte;
764 unsigned int *count;
765 struct page *page;
766 unsigned long pfn;
767 unsigned long flags;
768
769 spin_lock_irqsave(&as->lock, flags);
770
771 pte = locate_pte(as, iova, true, &page, &count);
772 pfn = *pte & SMMU_PFN_MASK;
773 WARN_ON(!pfn_valid(pfn));
774 dev_dbg(as->smmu->dev,
775 "iova:%08llx pfn:%08lx asid:%d\n", (unsigned long long)iova,
776 pfn, as->asid);
777
778 spin_unlock_irqrestore(&as->lock, flags);
779 return PFN_PHYS(pfn);
780}
781
782static int smmu_iommu_domain_has_cap(struct iommu_domain *domain,
783 unsigned long cap)
784{
785 return 0;
786}
787
788static int smmu_iommu_attach_dev(struct iommu_domain *domain,
789 struct device *dev)
790{
791 struct smmu_as *as = domain->priv;
792 struct smmu_device *smmu = as->smmu;
793 struct smmu_client *client, *c;
794 u32 map;
795 int err;
796
797 client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL);
798 if (!client)
799 return -ENOMEM;
800 client->dev = dev;
801 client->as = as;
802 map = (unsigned long)dev->platform_data;
803 if (!map)
804 return -EINVAL;
805
806 err = smmu_client_enable_hwgrp(client, map);
807 if (err)
808 goto err_hwgrp;
809
810 spin_lock(&as->client_lock);
811 list_for_each_entry(c, &as->client, list) {
812 if (c->dev == dev) {
813 dev_err(smmu->dev,
814 "%s is already attached\n", dev_name(c->dev));
815 err = -EINVAL;
816 goto err_client;
817 }
818 }
819 list_add(&client->list, &as->client);
820 spin_unlock(&as->client_lock);
821
822
823
824
825
826 if (map & HWG_AVPC) {
827 struct page *page;
828
829 page = as->smmu->avp_vector_page;
830 __smmu_iommu_map_pfn(as, 0, page_to_pfn(page));
831
832 pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n");
833 }
834
835 dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev));
836 return 0;
837
838err_client:
839 smmu_client_disable_hwgrp(client);
840 spin_unlock(&as->client_lock);
841err_hwgrp:
842 devm_kfree(smmu->dev, client);
843 return err;
844}
845
846static void smmu_iommu_detach_dev(struct iommu_domain *domain,
847 struct device *dev)
848{
849 struct smmu_as *as = domain->priv;
850 struct smmu_device *smmu = as->smmu;
851 struct smmu_client *c;
852
853 spin_lock(&as->client_lock);
854
855 list_for_each_entry(c, &as->client, list) {
856 if (c->dev == dev) {
857 smmu_client_disable_hwgrp(c);
858 list_del(&c->list);
859 devm_kfree(smmu->dev, c);
860 c->as = NULL;
861 dev_dbg(smmu->dev,
862 "%s is detached\n", dev_name(c->dev));
863 goto out;
864 }
865 }
866 dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev));
867out:
868 spin_unlock(&as->client_lock);
869}
870
871static int smmu_iommu_domain_init(struct iommu_domain *domain)
872{
873 int i, err = -EAGAIN;
874 unsigned long flags;
875 struct smmu_as *as;
876 struct smmu_device *smmu = smmu_handle;
877
878
879 for (i = 0; i < smmu->num_as; i++) {
880 as = &smmu->as[i];
881
882 if (as->pdir_page)
883 continue;
884
885 err = alloc_pdir(as);
886 if (!err)
887 goto found;
888
889 if (err != -EAGAIN)
890 break;
891 }
892 if (i == smmu->num_as)
893 dev_err(smmu->dev, "no free AS\n");
894 return err;
895
896found:
897 spin_lock_irqsave(&smmu->lock, flags);
898
899
900 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
901 smmu_write(smmu,
902 SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA);
903 FLUSH_SMMU_REGS(smmu);
904
905 spin_unlock_irqrestore(&smmu->lock, flags);
906
907 domain->priv = as;
908
909 domain->geometry.aperture_start = smmu->iovmm_base;
910 domain->geometry.aperture_end = smmu->iovmm_base +
911 smmu->page_count * SMMU_PAGE_SIZE - 1;
912 domain->geometry.force_aperture = true;
913
914 dev_dbg(smmu->dev, "smmu_as@%p\n", as);
915
916 return 0;
917}
918
919static void smmu_iommu_domain_destroy(struct iommu_domain *domain)
920{
921 struct smmu_as *as = domain->priv;
922 struct smmu_device *smmu = as->smmu;
923 unsigned long flags;
924
925 spin_lock_irqsave(&as->lock, flags);
926
927 if (as->pdir_page) {
928 spin_lock(&smmu->lock);
929 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
930 smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA);
931 FLUSH_SMMU_REGS(smmu);
932 spin_unlock(&smmu->lock);
933
934 free_pdir(as);
935 }
936
937 if (!list_empty(&as->client)) {
938 struct smmu_client *c;
939
940 list_for_each_entry(c, &as->client, list)
941 smmu_iommu_detach_dev(domain, c->dev);
942 }
943
944 spin_unlock_irqrestore(&as->lock, flags);
945
946 domain->priv = NULL;
947 dev_dbg(smmu->dev, "smmu_as@%p\n", as);
948}
949
950static struct iommu_ops smmu_iommu_ops = {
951 .domain_init = smmu_iommu_domain_init,
952 .domain_destroy = smmu_iommu_domain_destroy,
953 .attach_dev = smmu_iommu_attach_dev,
954 .detach_dev = smmu_iommu_detach_dev,
955 .map = smmu_iommu_map,
956 .unmap = smmu_iommu_unmap,
957 .iova_to_phys = smmu_iommu_iova_to_phys,
958 .domain_has_cap = smmu_iommu_domain_has_cap,
959 .pgsize_bitmap = SMMU_IOMMU_PGSIZES,
960};
961
962
963static const char * const smmu_debugfs_mc[] = { "mc", };
964static const char * const smmu_debugfs_cache[] = { "tlb", "ptc", };
965
966static ssize_t smmu_debugfs_stats_write(struct file *file,
967 const char __user *buffer,
968 size_t count, loff_t *pos)
969{
970 struct smmu_debugfs_info *info;
971 struct smmu_device *smmu;
972 int i;
973 enum {
974 _OFF = 0,
975 _ON,
976 _RESET,
977 };
978 const char * const command[] = {
979 [_OFF] = "off",
980 [_ON] = "on",
981 [_RESET] = "reset",
982 };
983 char str[] = "reset";
984 u32 val;
985 size_t offs;
986
987 count = min_t(size_t, count, sizeof(str));
988 if (copy_from_user(str, buffer, count))
989 return -EINVAL;
990
991 for (i = 0; i < ARRAY_SIZE(command); i++)
992 if (strncmp(str, command[i],
993 strlen(command[i])) == 0)
994 break;
995
996 if (i == ARRAY_SIZE(command))
997 return -EINVAL;
998
999 info = file_inode(file)->i_private;
1000 smmu = info->smmu;
1001
1002 offs = SMMU_CACHE_CONFIG(info->cache);
1003 val = smmu_read(smmu, offs);
1004 switch (i) {
1005 case _OFF:
1006 val &= ~SMMU_CACHE_CONFIG_STATS_ENABLE;
1007 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1008 smmu_write(smmu, val, offs);
1009 break;
1010 case _ON:
1011 val |= SMMU_CACHE_CONFIG_STATS_ENABLE;
1012 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1013 smmu_write(smmu, val, offs);
1014 break;
1015 case _RESET:
1016 val |= SMMU_CACHE_CONFIG_STATS_TEST;
1017 smmu_write(smmu, val, offs);
1018 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1019 smmu_write(smmu, val, offs);
1020 break;
1021 default:
1022 BUG();
1023 break;
1024 }
1025
1026 dev_dbg(smmu->dev, "%s() %08x, %08x @%08x\n", __func__,
1027 val, smmu_read(smmu, offs), offs);
1028
1029 return count;
1030}
1031
1032static int smmu_debugfs_stats_show(struct seq_file *s, void *v)
1033{
1034 struct smmu_debugfs_info *info = s->private;
1035 struct smmu_device *smmu = info->smmu;
1036 int i;
1037 const char * const stats[] = { "hit", "miss", };
1038
1039
1040 for (i = 0; i < ARRAY_SIZE(stats); i++) {
1041 u32 val;
1042 size_t offs;
1043
1044 offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i);
1045 val = smmu_read(smmu, offs);
1046 seq_printf(s, "%s:%08x ", stats[i], val);
1047
1048 dev_dbg(smmu->dev, "%s() %s %08x @%08x\n", __func__,
1049 stats[i], val, offs);
1050 }
1051 seq_printf(s, "\n");
1052 return 0;
1053}
1054
1055static int smmu_debugfs_stats_open(struct inode *inode, struct file *file)
1056{
1057 return single_open(file, smmu_debugfs_stats_show, inode->i_private);
1058}
1059
1060static const struct file_operations smmu_debugfs_stats_fops = {
1061 .open = smmu_debugfs_stats_open,
1062 .read = seq_read,
1063 .llseek = seq_lseek,
1064 .release = single_release,
1065 .write = smmu_debugfs_stats_write,
1066};
1067
1068static void smmu_debugfs_delete(struct smmu_device *smmu)
1069{
1070 debugfs_remove_recursive(smmu->debugfs_root);
1071 kfree(smmu->debugfs_info);
1072}
1073
1074static void smmu_debugfs_create(struct smmu_device *smmu)
1075{
1076 int i;
1077 size_t bytes;
1078 struct dentry *root;
1079
1080 bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) *
1081 sizeof(*smmu->debugfs_info);
1082 smmu->debugfs_info = kmalloc(bytes, GFP_KERNEL);
1083 if (!smmu->debugfs_info)
1084 return;
1085
1086 root = debugfs_create_dir(dev_name(smmu->dev), NULL);
1087 if (!root)
1088 goto err_out;
1089 smmu->debugfs_root = root;
1090
1091 for (i = 0; i < ARRAY_SIZE(smmu_debugfs_mc); i++) {
1092 int j;
1093 struct dentry *mc;
1094
1095 mc = debugfs_create_dir(smmu_debugfs_mc[i], root);
1096 if (!mc)
1097 goto err_out;
1098
1099 for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) {
1100 struct dentry *cache;
1101 struct smmu_debugfs_info *info;
1102
1103 info = smmu->debugfs_info;
1104 info += i * ARRAY_SIZE(smmu_debugfs_mc) + j;
1105 info->smmu = smmu;
1106 info->mc = i;
1107 info->cache = j;
1108
1109 cache = debugfs_create_file(smmu_debugfs_cache[j],
1110 S_IWUGO | S_IRUGO, mc,
1111 (void *)info,
1112 &smmu_debugfs_stats_fops);
1113 if (!cache)
1114 goto err_out;
1115 }
1116 }
1117
1118 return;
1119
1120err_out:
1121 smmu_debugfs_delete(smmu);
1122}
1123
1124static int tegra_smmu_suspend(struct device *dev)
1125{
1126 struct smmu_device *smmu = dev_get_drvdata(dev);
1127
1128 smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0);
1129 smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1);
1130 smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2);
1131 smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY);
1132 return 0;
1133}
1134
1135static int tegra_smmu_resume(struct device *dev)
1136{
1137 struct smmu_device *smmu = dev_get_drvdata(dev);
1138 unsigned long flags;
1139 int err;
1140
1141 spin_lock_irqsave(&smmu->lock, flags);
1142 err = smmu_setup_regs(smmu);
1143 spin_unlock_irqrestore(&smmu->lock, flags);
1144 return err;
1145}
1146
1147static int tegra_smmu_probe(struct platform_device *pdev)
1148{
1149 struct smmu_device *smmu;
1150 struct device *dev = &pdev->dev;
1151 int i, asids, err = 0;
1152 dma_addr_t uninitialized_var(base);
1153 size_t bytes, uninitialized_var(size);
1154
1155 if (smmu_handle)
1156 return -EIO;
1157
1158 BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT);
1159
1160 if (of_property_read_u32(dev->of_node, "nvidia,#asids", &asids))
1161 return -ENODEV;
1162
1163 bytes = sizeof(*smmu) + asids * sizeof(*smmu->as);
1164 smmu = devm_kzalloc(dev, bytes, GFP_KERNEL);
1165 if (!smmu) {
1166 dev_err(dev, "failed to allocate smmu_device\n");
1167 return -ENOMEM;
1168 }
1169
1170 smmu->nregs = pdev->num_resources;
1171 smmu->regs = devm_kzalloc(dev, 2 * smmu->nregs * sizeof(*smmu->regs),
1172 GFP_KERNEL);
1173 smmu->rege = smmu->regs + smmu->nregs;
1174 if (!smmu->regs)
1175 return -ENOMEM;
1176 for (i = 0; i < smmu->nregs; i++) {
1177 struct resource *res;
1178
1179 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
1180 if (!res)
1181 return -ENODEV;
1182 smmu->regs[i] = devm_ioremap_resource(&pdev->dev, res);
1183 if (IS_ERR(smmu->regs[i]))
1184 return PTR_ERR(smmu->regs[i]);
1185 smmu->rege[i] = smmu->regs[i] + resource_size(res) - 1;
1186 }
1187
1188 smmu->regbase = (void __iomem *)((u32)smmu->regs[0] & PAGE_MASK);
1189
1190 err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size);
1191 if (err)
1192 return -ENODEV;
1193
1194 if (size & SMMU_PAGE_MASK)
1195 return -EINVAL;
1196
1197 size >>= SMMU_PAGE_SHIFT;
1198 if (!size)
1199 return -EINVAL;
1200
1201 smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0);
1202 if (!smmu->ahb)
1203 return -ENODEV;
1204
1205 smmu->dev = dev;
1206 smmu->num_as = asids;
1207 smmu->iovmm_base = base;
1208 smmu->page_count = size;
1209
1210 smmu->translation_enable_0 = ~0;
1211 smmu->translation_enable_1 = ~0;
1212 smmu->translation_enable_2 = ~0;
1213 smmu->asid_security = 0;
1214
1215 for (i = 0; i < smmu->num_as; i++) {
1216 struct smmu_as *as = &smmu->as[i];
1217
1218 as->smmu = smmu;
1219 as->asid = i;
1220 as->pdir_attr = _PDIR_ATTR;
1221 as->pde_attr = _PDE_ATTR;
1222 as->pte_attr = _PTE_ATTR;
1223
1224 spin_lock_init(&as->lock);
1225 spin_lock_init(&as->client_lock);
1226 INIT_LIST_HEAD(&as->client);
1227 }
1228 spin_lock_init(&smmu->lock);
1229 err = smmu_setup_regs(smmu);
1230 if (err)
1231 return err;
1232 platform_set_drvdata(pdev, smmu);
1233
1234 smmu->avp_vector_page = alloc_page(GFP_KERNEL);
1235 if (!smmu->avp_vector_page)
1236 return -ENOMEM;
1237
1238 smmu_debugfs_create(smmu);
1239 smmu_handle = smmu;
1240 bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
1241 return 0;
1242}
1243
1244static int tegra_smmu_remove(struct platform_device *pdev)
1245{
1246 struct smmu_device *smmu = platform_get_drvdata(pdev);
1247 int i;
1248
1249 smmu_debugfs_delete(smmu);
1250
1251 smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG);
1252 for (i = 0; i < smmu->num_as; i++)
1253 free_pdir(&smmu->as[i]);
1254 __free_page(smmu->avp_vector_page);
1255 smmu_handle = NULL;
1256 return 0;
1257}
1258
1259const struct dev_pm_ops tegra_smmu_pm_ops = {
1260 .suspend = tegra_smmu_suspend,
1261 .resume = tegra_smmu_resume,
1262};
1263
1264static struct of_device_id tegra_smmu_of_match[] = {
1265 { .compatible = "nvidia,tegra30-smmu", },
1266 { },
1267};
1268MODULE_DEVICE_TABLE(of, tegra_smmu_of_match);
1269
1270static struct platform_driver tegra_smmu_driver = {
1271 .probe = tegra_smmu_probe,
1272 .remove = tegra_smmu_remove,
1273 .driver = {
1274 .owner = THIS_MODULE,
1275 .name = "tegra-smmu",
1276 .pm = &tegra_smmu_pm_ops,
1277 .of_match_table = tegra_smmu_of_match,
1278 },
1279};
1280
1281static int tegra_smmu_init(void)
1282{
1283 return platform_driver_register(&tegra_smmu_driver);
1284}
1285
1286static void __exit tegra_smmu_exit(void)
1287{
1288 platform_driver_unregister(&tegra_smmu_driver);
1289}
1290
1291subsys_initcall(tegra_smmu_init);
1292module_exit(tegra_smmu_exit);
1293
1294MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30");
1295MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
1296MODULE_ALIAS("platform:tegra-smmu");
1297MODULE_LICENSE("GPL v2");
1298
