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1 | /* | |
2 | * IOMMU API for SMMU in Tegra30 | |
3 | * | |
4 | * Copyright (c) 2011-2013, NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) "%s(): " fmt, __func__ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/iommu.h> | |
32 | #include <linux/io.h> | |
33 | #include <linux/of.h> | |
34 | #include <linux/of_iommu.h> | |
35 | #include <linux/debugfs.h> | |
36 | #include <linux/seq_file.h> | |
37 | #include <linux/tegra-ahb.h> | |
38 | ||
39 | #include <asm/page.h> | |
40 | #include <asm/cacheflush.h> | |
41 | ||
42 | enum smmu_hwgrp { | |
43 | HWGRP_AFI, | |
44 | HWGRP_AVPC, | |
45 | HWGRP_DC, | |
46 | HWGRP_DCB, | |
47 | HWGRP_EPP, | |
48 | HWGRP_G2, | |
49 | HWGRP_HC, | |
50 | HWGRP_HDA, | |
51 | HWGRP_ISP, | |
52 | HWGRP_MPE, | |
53 | HWGRP_NV, | |
54 | HWGRP_NV2, | |
55 | HWGRP_PPCS, | |
56 | HWGRP_SATA, | |
57 | HWGRP_VDE, | |
58 | HWGRP_VI, | |
59 | ||
60 | HWGRP_COUNT, | |
61 | ||
62 | HWGRP_END = ~0, | |
63 | }; | |
64 | ||
65 | #define HWG_AFI (1 << HWGRP_AFI) | |
66 | #define HWG_AVPC (1 << HWGRP_AVPC) | |
67 | #define HWG_DC (1 << HWGRP_DC) | |
68 | #define HWG_DCB (1 << HWGRP_DCB) | |
69 | #define HWG_EPP (1 << HWGRP_EPP) | |
70 | #define HWG_G2 (1 << HWGRP_G2) | |
71 | #define HWG_HC (1 << HWGRP_HC) | |
72 | #define HWG_HDA (1 << HWGRP_HDA) | |
73 | #define HWG_ISP (1 << HWGRP_ISP) | |
74 | #define HWG_MPE (1 << HWGRP_MPE) | |
75 | #define HWG_NV (1 << HWGRP_NV) | |
76 | #define HWG_NV2 (1 << HWGRP_NV2) | |
77 | #define HWG_PPCS (1 << HWGRP_PPCS) | |
78 | #define HWG_SATA (1 << HWGRP_SATA) | |
79 | #define HWG_VDE (1 << HWGRP_VDE) | |
80 | #define HWG_VI (1 << HWGRP_VI) | |
81 | ||
82 | /* bitmap of the page sizes currently supported */ | |
83 | #define SMMU_IOMMU_PGSIZES (SZ_4K) | |
84 | ||
85 | #define SMMU_CONFIG 0x10 | |
86 | #define SMMU_CONFIG_DISABLE 0 | |
87 | #define SMMU_CONFIG_ENABLE 1 | |
88 | ||
89 | /* REVISIT: To support multiple MCs */ | |
90 | enum { | |
91 | _MC = 0, | |
92 | }; | |
93 | ||
94 | enum { | |
95 | _TLB = 0, | |
96 | _PTC, | |
97 | }; | |
98 | ||
99 | #define SMMU_CACHE_CONFIG_BASE 0x14 | |
100 | #define __SMMU_CACHE_CONFIG(mc, cache) (SMMU_CACHE_CONFIG_BASE + 4 * cache) | |
101 | #define SMMU_CACHE_CONFIG(cache) __SMMU_CACHE_CONFIG(_MC, cache) | |
102 | ||
103 | #define SMMU_CACHE_CONFIG_STATS_SHIFT 31 | |
104 | #define SMMU_CACHE_CONFIG_STATS_ENABLE (1 << SMMU_CACHE_CONFIG_STATS_SHIFT) | |
105 | #define SMMU_CACHE_CONFIG_STATS_TEST_SHIFT 30 | |
106 | #define SMMU_CACHE_CONFIG_STATS_TEST (1 << SMMU_CACHE_CONFIG_STATS_TEST_SHIFT) | |
107 | ||
108 | #define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE (1 << 29) | |
109 | #define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE 0x10 | |
110 | #define SMMU_TLB_CONFIG_RESET_VAL 0x20000010 | |
111 | ||
112 | #define SMMU_PTC_CONFIG_CACHE__ENABLE (1 << 29) | |
113 | #define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN 0x3f | |
114 | #define SMMU_PTC_CONFIG_RESET_VAL 0x2000003f | |
115 | ||
116 | #define SMMU_PTB_ASID 0x1c | |
117 | #define SMMU_PTB_ASID_CURRENT_SHIFT 0 | |
118 | ||
119 | #define SMMU_PTB_DATA 0x20 | |
120 | #define SMMU_PTB_DATA_RESET_VAL 0 | |
121 | #define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT 29 | |
122 | #define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT 30 | |
123 | #define SMMU_PTB_DATA_ASID_READABLE_SHIFT 31 | |
124 | ||
125 | #define SMMU_TLB_FLUSH 0x30 | |
126 | #define SMMU_TLB_FLUSH_VA_MATCH_ALL 0 | |
127 | #define SMMU_TLB_FLUSH_VA_MATCH_SECTION 2 | |
128 | #define SMMU_TLB_FLUSH_VA_MATCH_GROUP 3 | |
129 | #define SMMU_TLB_FLUSH_ASID_SHIFT 29 | |
130 | #define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE 0 | |
131 | #define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE 1 | |
132 | #define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT 31 | |
133 | ||
134 | #define SMMU_PTC_FLUSH 0x34 | |
135 | #define SMMU_PTC_FLUSH_TYPE_ALL 0 | |
136 | #define SMMU_PTC_FLUSH_TYPE_ADR 1 | |
137 | #define SMMU_PTC_FLUSH_ADR_SHIFT 4 | |
138 | ||
139 | #define SMMU_ASID_SECURITY 0x38 | |
140 | ||
141 | #define SMMU_STATS_CACHE_COUNT_BASE 0x1f0 | |
142 | ||
143 | #define SMMU_STATS_CACHE_COUNT(mc, cache, hitmiss) \ | |
144 | (SMMU_STATS_CACHE_COUNT_BASE + 8 * cache + 4 * hitmiss) | |
145 | ||
146 | #define SMMU_TRANSLATION_ENABLE_0 0x228 | |
147 | #define SMMU_TRANSLATION_ENABLE_1 0x22c | |
148 | #define SMMU_TRANSLATION_ENABLE_2 0x230 | |
149 | ||
150 | #define SMMU_AFI_ASID 0x238 /* PCIE */ | |
151 | #define SMMU_AVPC_ASID 0x23c /* AVP */ | |
152 | #define SMMU_DC_ASID 0x240 /* Display controller */ | |
153 | #define SMMU_DCB_ASID 0x244 /* Display controller B */ | |
154 | #define SMMU_EPP_ASID 0x248 /* Encoder pre-processor */ | |
155 | #define SMMU_G2_ASID 0x24c /* 2D engine */ | |
156 | #define SMMU_HC_ASID 0x250 /* Host1x */ | |
157 | #define SMMU_HDA_ASID 0x254 /* High-def audio */ | |
158 | #define SMMU_ISP_ASID 0x258 /* Image signal processor */ | |
159 | #define SMMU_MPE_ASID 0x264 /* MPEG encoder */ | |
160 | #define SMMU_NV_ASID 0x268 /* (3D) */ | |
161 | #define SMMU_NV2_ASID 0x26c /* (3D) */ | |
162 | #define SMMU_PPCS_ASID 0x270 /* AHB */ | |
163 | #define SMMU_SATA_ASID 0x278 /* SATA */ | |
164 | #define SMMU_VDE_ASID 0x27c /* Video decoder */ | |
165 | #define SMMU_VI_ASID 0x280 /* Video input */ | |
166 | ||
167 | #define SMMU_PDE_NEXT_SHIFT 28 | |
168 | ||
169 | #define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000 | |
170 | #define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12 /* right shift */ | |
171 | #define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000 | |
172 | #define SMMU_TLB_FLUSH_VA_GROUP__SHIFT 12 /* right shift */ | |
173 | #define SMMU_TLB_FLUSH_VA(iova, which) \ | |
174 | ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \ | |
175 | SMMU_TLB_FLUSH_VA_##which##__SHIFT) | \ | |
176 | SMMU_TLB_FLUSH_VA_MATCH_##which) | |
177 | #define SMMU_PTB_ASID_CUR(n) \ | |
178 | ((n) << SMMU_PTB_ASID_CURRENT_SHIFT) | |
179 | #define SMMU_TLB_FLUSH_ASID_MATCH_disable \ | |
180 | (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE << \ | |
181 | SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) | |
182 | #define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE \ | |
183 | (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE << \ | |
184 | SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) | |
185 | ||
186 | #define SMMU_PAGE_SHIFT 12 | |
187 | #define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT) | |
188 | #define SMMU_PAGE_MASK ((1 << SMMU_PAGE_SHIFT) - 1) | |
189 | ||
190 | #define SMMU_PDIR_COUNT 1024 | |
191 | #define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT) | |
192 | #define SMMU_PTBL_COUNT 1024 | |
193 | #define SMMU_PTBL_SIZE (sizeof(unsigned long) * SMMU_PTBL_COUNT) | |
194 | #define SMMU_PDIR_SHIFT 12 | |
195 | #define SMMU_PDE_SHIFT 12 | |
196 | #define SMMU_PTE_SHIFT 12 | |
197 | #define SMMU_PFN_MASK 0x000fffff | |
198 | ||
199 | #define SMMU_ADDR_TO_PFN(addr) ((addr) >> 12) | |
200 | #define SMMU_ADDR_TO_PDN(addr) ((addr) >> 22) | |
201 | #define SMMU_PDN_TO_ADDR(pdn) ((pdn) << 22) | |
202 | ||
203 | #define _READABLE (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT) | |
204 | #define _WRITABLE (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT) | |
205 | #define _NONSECURE (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT) | |
206 | #define _PDE_NEXT (1 << SMMU_PDE_NEXT_SHIFT) | |
207 | #define _MASK_ATTR (_READABLE | _WRITABLE | _NONSECURE) | |
208 | ||
209 | #define _PDIR_ATTR (_READABLE | _WRITABLE | _NONSECURE) | |
210 | ||
211 | #define _PDE_ATTR (_READABLE | _WRITABLE | _NONSECURE) | |
212 | #define _PDE_ATTR_N (_PDE_ATTR | _PDE_NEXT) | |
213 | #define _PDE_VACANT(pdn) (((pdn) << 10) | _PDE_ATTR) | |
214 | ||
215 | #define _PTE_ATTR (_READABLE | _WRITABLE | _NONSECURE) | |
216 | #define _PTE_VACANT(addr) (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR) | |
217 | ||
218 | #define SMMU_MK_PDIR(page, attr) \ | |
219 | ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr)) | |
220 | #define SMMU_MK_PDE(page, attr) \ | |
221 | (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr)) | |
222 | #define SMMU_EX_PTBL_PAGE(pde) \ | |
223 | pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK) | |
224 | #define SMMU_PFN_TO_PTE(pfn, attr) (unsigned long)((pfn) | (attr)) | |
225 | ||
226 | #define SMMU_ASID_ENABLE(asid) ((asid) | (1 << 31)) | |
227 | #define SMMU_ASID_DISABLE 0 | |
228 | #define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0)) | |
229 | ||
230 | #define NUM_SMMU_REG_BANKS 3 | |
231 | ||
232 | #define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1) | |
233 | #define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0) | |
234 | #define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1) | |
235 | #define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0) | |
236 | ||
237 | #define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID | |
238 | ||
239 | static const u32 smmu_hwgrp_asid_reg[] = { | |
240 | HWGRP_INIT(AFI), | |
241 | HWGRP_INIT(AVPC), | |
242 | HWGRP_INIT(DC), | |
243 | HWGRP_INIT(DCB), | |
244 | HWGRP_INIT(EPP), | |
245 | HWGRP_INIT(G2), | |
246 | HWGRP_INIT(HC), | |
247 | HWGRP_INIT(HDA), | |
248 | HWGRP_INIT(ISP), | |
249 | HWGRP_INIT(MPE), | |
250 | HWGRP_INIT(NV), | |
251 | HWGRP_INIT(NV2), | |
252 | HWGRP_INIT(PPCS), | |
253 | HWGRP_INIT(SATA), | |
254 | HWGRP_INIT(VDE), | |
255 | HWGRP_INIT(VI), | |
256 | }; | |
257 | #define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x]) | |
258 | ||
259 | /* | |
260 | * Per client for address space | |
261 | */ | |
262 | struct smmu_client { | |
263 | struct device *dev; | |
264 | struct list_head list; | |
265 | struct smmu_as *as; | |
266 | u32 hwgrp; | |
267 | }; | |
268 | ||
269 | /* | |
270 | * Per address space | |
271 | */ | |
272 | struct smmu_as { | |
273 | struct smmu_device *smmu; /* back pointer to container */ | |
274 | unsigned int asid; | |
275 | spinlock_t lock; /* for pagetable */ | |
276 | struct page *pdir_page; | |
277 | unsigned long pdir_attr; | |
278 | unsigned long pde_attr; | |
279 | unsigned long pte_attr; | |
280 | unsigned int *pte_count; | |
281 | ||
282 | struct list_head client; | |
283 | spinlock_t client_lock; /* for client list */ | |
284 | }; | |
285 | ||
286 | struct smmu_debugfs_info { | |
287 | struct smmu_device *smmu; | |
288 | int mc; | |
289 | int cache; | |
290 | }; | |
291 | ||
292 | /* | |
293 | * Per SMMU device - IOMMU device | |
294 | */ | |
295 | struct smmu_device { | |
296 | void __iomem *regbase; /* register offset base */ | |
297 | void __iomem **regs; /* register block start address array */ | |
298 | void __iomem **rege; /* register block end address array */ | |
299 | int nregs; /* number of register blocks */ | |
300 | ||
301 | unsigned long iovmm_base; /* remappable base address */ | |
302 | unsigned long page_count; /* total remappable size */ | |
303 | spinlock_t lock; | |
304 | char *name; | |
305 | struct device *dev; | |
306 | struct page *avp_vector_page; /* dummy page shared by all AS's */ | |
307 | ||
308 | /* | |
309 | * Register image savers for suspend/resume | |
310 | */ | |
311 | unsigned long translation_enable_0; | |
312 | unsigned long translation_enable_1; | |
313 | unsigned long translation_enable_2; | |
314 | unsigned long asid_security; | |
315 | ||
316 | struct dentry *debugfs_root; | |
317 | struct smmu_debugfs_info *debugfs_info; | |
318 | ||
319 | struct device_node *ahb; | |
320 | ||
321 | int num_as; | |
322 | struct smmu_as as[0]; /* Run-time allocated array */ | |
323 | }; | |
324 | ||
325 | static struct smmu_device *smmu_handle; /* unique for a system */ | |
326 | ||
327 | /* | |
328 | * SMMU register accessors | |
329 | */ | |
330 | static inline u32 smmu_read(struct smmu_device *smmu, size_t offs) | |
331 | { | |
332 | int i; | |
333 | ||
334 | for (i = 0; i < smmu->nregs; i++) { | |
335 | void __iomem *addr = smmu->regbase + offs; | |
336 | ||
337 | BUG_ON(addr < smmu->regs[i]); | |
338 | if (addr <= smmu->rege[i]) | |
339 | return readl(addr); | |
340 | } | |
341 | ||
342 | BUG(); | |
343 | } | |
344 | ||
345 | static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs) | |
346 | { | |
347 | int i; | |
348 | ||
349 | for (i = 0; i < smmu->nregs; i++) { | |
350 | void __iomem *addr = smmu->regbase + offs; | |
351 | ||
352 | BUG_ON(addr < smmu->regs[i]); | |
353 | if (addr <= smmu->rege[i]) { | |
354 | writel(val, addr); | |
355 | return; | |
356 | } | |
357 | } | |
358 | ||
359 | BUG(); | |
360 | } | |
361 | ||
362 | #define VA_PAGE_TO_PA(va, page) \ | |
363 | (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK)) | |
364 | ||
365 | #define FLUSH_CPU_DCACHE(va, page, size) \ | |
366 | do { \ | |
367 | unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \ | |
368 | __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \ | |
369 | outer_flush_range(_pa_, _pa_+(size_t)(size)); \ | |
370 | } while (0) | |
371 | ||
372 | /* | |
373 | * Any interaction between any block on PPSB and a block on APB or AHB | |
374 | * must have these read-back barriers to ensure the APB/AHB bus | |
375 | * transaction is complete before initiating activity on the PPSB | |
376 | * block. | |
377 | */ | |
378 | #define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG) | |
379 | ||
380 | #define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data) | |
381 | ||
382 | static int __smmu_client_set_hwgrp(struct smmu_client *c, | |
383 | unsigned long map, int on) | |
384 | { | |
385 | int i; | |
386 | struct smmu_as *as = c->as; | |
387 | u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid); | |
388 | struct smmu_device *smmu = as->smmu; | |
389 | ||
390 | WARN_ON(!on && map); | |
391 | if (on && !map) | |
392 | return -EINVAL; | |
393 | if (!on) | |
394 | map = smmu_client_hwgrp(c); | |
395 | ||
396 | for_each_set_bit(i, &map, HWGRP_COUNT) { | |
397 | offs = HWGRP_ASID_REG(i); | |
398 | val = smmu_read(smmu, offs); | |
399 | if (on) { | |
400 | if (WARN_ON(val & mask)) | |
401 | goto err_hw_busy; | |
402 | val |= mask; | |
403 | } else { | |
404 | WARN_ON((val & mask) == mask); | |
405 | val &= ~mask; | |
406 | } | |
407 | smmu_write(smmu, val, offs); | |
408 | } | |
409 | FLUSH_SMMU_REGS(smmu); | |
410 | c->hwgrp = map; | |
411 | return 0; | |
412 | ||
413 | err_hw_busy: | |
414 | for_each_set_bit(i, &map, HWGRP_COUNT) { | |
415 | offs = HWGRP_ASID_REG(i); | |
416 | val = smmu_read(smmu, offs); | |
417 | val &= ~mask; | |
418 | smmu_write(smmu, val, offs); | |
419 | } | |
420 | return -EBUSY; | |
421 | } | |
422 | ||
423 | static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on) | |
424 | { | |
425 | u32 val; | |
426 | unsigned long flags; | |
427 | struct smmu_as *as = c->as; | |
428 | struct smmu_device *smmu = as->smmu; | |
429 | ||
430 | spin_lock_irqsave(&smmu->lock, flags); | |
431 | val = __smmu_client_set_hwgrp(c, map, on); | |
432 | spin_unlock_irqrestore(&smmu->lock, flags); | |
433 | return val; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Flush all TLB entries and all PTC entries | |
438 | * Caller must lock smmu | |
439 | */ | |
440 | static void smmu_flush_regs(struct smmu_device *smmu, int enable) | |
441 | { | |
442 | u32 val; | |
443 | ||
444 | smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH); | |
445 | FLUSH_SMMU_REGS(smmu); | |
446 | val = SMMU_TLB_FLUSH_VA_MATCH_ALL | | |
447 | SMMU_TLB_FLUSH_ASID_MATCH_disable; | |
448 | smmu_write(smmu, val, SMMU_TLB_FLUSH); | |
449 | ||
450 | if (enable) | |
451 | smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG); | |
452 | FLUSH_SMMU_REGS(smmu); | |
453 | } | |
454 | ||
455 | static int smmu_setup_regs(struct smmu_device *smmu) | |
456 | { | |
457 | int i; | |
458 | u32 val; | |
459 | ||
460 | for (i = 0; i < smmu->num_as; i++) { | |
461 | struct smmu_as *as = &smmu->as[i]; | |
462 | struct smmu_client *c; | |
463 | ||
464 | smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); | |
465 | val = as->pdir_page ? | |
466 | SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) : | |
467 | SMMU_PTB_DATA_RESET_VAL; | |
468 | smmu_write(smmu, val, SMMU_PTB_DATA); | |
469 | ||
470 | list_for_each_entry(c, &as->client, list) | |
471 | __smmu_client_set_hwgrp(c, c->hwgrp, 1); | |
472 | } | |
473 | ||
474 | smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0); | |
475 | smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1); | |
476 | smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2); | |
477 | smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY); | |
478 | smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_TLB)); | |
479 | smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_PTC)); | |
480 | ||
481 | smmu_flush_regs(smmu, 1); | |
482 | ||
483 | return tegra_ahb_enable_smmu(smmu->ahb); | |
484 | } | |
485 | ||
486 | static void flush_ptc_and_tlb(struct smmu_device *smmu, | |
487 | struct smmu_as *as, dma_addr_t iova, | |
488 | unsigned long *pte, struct page *page, int is_pde) | |
489 | { | |
490 | u32 val; | |
491 | unsigned long tlb_flush_va = is_pde | |
492 | ? SMMU_TLB_FLUSH_VA(iova, SECTION) | |
493 | : SMMU_TLB_FLUSH_VA(iova, GROUP); | |
494 | ||
495 | val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page); | |
496 | smmu_write(smmu, val, SMMU_PTC_FLUSH); | |
497 | FLUSH_SMMU_REGS(smmu); | |
498 | val = tlb_flush_va | | |
499 | SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | | |
500 | (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); | |
501 | smmu_write(smmu, val, SMMU_TLB_FLUSH); | |
502 | FLUSH_SMMU_REGS(smmu); | |
503 | } | |
504 | ||
505 | static void free_ptbl(struct smmu_as *as, dma_addr_t iova) | |
506 | { | |
507 | unsigned long pdn = SMMU_ADDR_TO_PDN(iova); | |
508 | unsigned long *pdir = (unsigned long *)page_address(as->pdir_page); | |
509 | ||
510 | if (pdir[pdn] != _PDE_VACANT(pdn)) { | |
511 | dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn); | |
512 | ||
513 | ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn])); | |
514 | __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn])); | |
515 | pdir[pdn] = _PDE_VACANT(pdn); | |
516 | FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); | |
517 | flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], | |
518 | as->pdir_page, 1); | |
519 | } | |
520 | } | |
521 | ||
522 | static void free_pdir(struct smmu_as *as) | |
523 | { | |
524 | unsigned addr; | |
525 | int count; | |
526 | struct device *dev = as->smmu->dev; | |
527 | ||
528 | if (!as->pdir_page) | |
529 | return; | |
530 | ||
531 | addr = as->smmu->iovmm_base; | |
532 | count = as->smmu->page_count; | |
533 | while (count-- > 0) { | |
534 | free_ptbl(as, addr); | |
535 | addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT; | |
536 | } | |
537 | ClearPageReserved(as->pdir_page); | |
538 | __free_page(as->pdir_page); | |
539 | as->pdir_page = NULL; | |
540 | devm_kfree(dev, as->pte_count); | |
541 | as->pte_count = NULL; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Maps PTBL for given iova and returns the PTE address | |
546 | * Caller must unmap the mapped PTBL returned in *ptbl_page_p | |
547 | */ | |
548 | static unsigned long *locate_pte(struct smmu_as *as, | |
549 | dma_addr_t iova, bool allocate, | |
550 | struct page **ptbl_page_p, | |
551 | unsigned int **count) | |
552 | { | |
553 | unsigned long ptn = SMMU_ADDR_TO_PFN(iova); | |
554 | unsigned long pdn = SMMU_ADDR_TO_PDN(iova); | |
555 | unsigned long *pdir = page_address(as->pdir_page); | |
556 | unsigned long *ptbl; | |
557 | ||
558 | if (pdir[pdn] != _PDE_VACANT(pdn)) { | |
559 | /* Mapped entry table already exists */ | |
560 | *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]); | |
561 | ptbl = page_address(*ptbl_page_p); | |
562 | } else if (!allocate) { | |
563 | return NULL; | |
564 | } else { | |
565 | int pn; | |
566 | unsigned long addr = SMMU_PDN_TO_ADDR(pdn); | |
567 | ||
568 | /* Vacant - allocate a new page table */ | |
569 | dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn); | |
570 | ||
571 | *ptbl_page_p = alloc_page(GFP_ATOMIC); | |
572 | if (!*ptbl_page_p) { | |
573 | dev_err(as->smmu->dev, | |
574 | "failed to allocate smmu_device page table\n"); | |
575 | return NULL; | |
576 | } | |
577 | SetPageReserved(*ptbl_page_p); | |
578 | ptbl = (unsigned long *)page_address(*ptbl_page_p); | |
579 | for (pn = 0; pn < SMMU_PTBL_COUNT; | |
580 | pn++, addr += SMMU_PAGE_SIZE) { | |
581 | ptbl[pn] = _PTE_VACANT(addr); | |
582 | } | |
583 | FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE); | |
584 | pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p, | |
585 | as->pde_attr | _PDE_NEXT); | |
586 | FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); | |
587 | flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], | |
588 | as->pdir_page, 1); | |
589 | } | |
590 | *count = &as->pte_count[pdn]; | |
591 | ||
592 | return &ptbl[ptn % SMMU_PTBL_COUNT]; | |
593 | } | |
594 | ||
595 | #ifdef CONFIG_SMMU_SIG_DEBUG | |
596 | static void put_signature(struct smmu_as *as, | |
597 | dma_addr_t iova, unsigned long pfn) | |
598 | { | |
599 | struct page *page; | |
600 | unsigned long *vaddr; | |
601 | ||
602 | page = pfn_to_page(pfn); | |
603 | vaddr = page_address(page); | |
604 | if (!vaddr) | |
605 | return; | |
606 | ||
607 | vaddr[0] = iova; | |
608 | vaddr[1] = pfn << PAGE_SHIFT; | |
609 | FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2); | |
610 | } | |
611 | #else | |
612 | static inline void put_signature(struct smmu_as *as, | |
613 | unsigned long addr, unsigned long pfn) | |
614 | { | |
615 | } | |
616 | #endif | |
617 | ||
618 | /* | |
619 | * Caller must not hold as->lock | |
620 | */ | |
621 | static int alloc_pdir(struct smmu_as *as) | |
622 | { | |
623 | unsigned long *pdir, flags; | |
624 | int pdn, err = 0; | |
625 | u32 val; | |
626 | struct smmu_device *smmu = as->smmu; | |
627 | struct page *page; | |
628 | unsigned int *cnt; | |
629 | ||
630 | /* | |
631 | * do the allocation, then grab as->lock | |
632 | */ | |
633 | cnt = devm_kzalloc(smmu->dev, | |
634 | sizeof(cnt[0]) * SMMU_PDIR_COUNT, | |
635 | GFP_KERNEL); | |
636 | page = alloc_page(GFP_KERNEL | __GFP_DMA); | |
637 | ||
638 | spin_lock_irqsave(&as->lock, flags); | |
639 | ||
640 | if (as->pdir_page) { | |
641 | /* We raced, free the redundant */ | |
642 | err = -EAGAIN; | |
643 | goto err_out; | |
644 | } | |
645 | ||
646 | if (!page || !cnt) { | |
647 | dev_err(smmu->dev, "failed to allocate at %s\n", __func__); | |
648 | err = -ENOMEM; | |
649 | goto err_out; | |
650 | } | |
651 | ||
652 | as->pdir_page = page; | |
653 | as->pte_count = cnt; | |
654 | ||
655 | SetPageReserved(as->pdir_page); | |
656 | pdir = page_address(as->pdir_page); | |
657 | ||
658 | for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++) | |
659 | pdir[pdn] = _PDE_VACANT(pdn); | |
660 | FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE); | |
661 | val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page); | |
662 | smmu_write(smmu, val, SMMU_PTC_FLUSH); | |
663 | FLUSH_SMMU_REGS(as->smmu); | |
664 | val = SMMU_TLB_FLUSH_VA_MATCH_ALL | | |
665 | SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | | |
666 | (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); | |
667 | smmu_write(smmu, val, SMMU_TLB_FLUSH); | |
668 | FLUSH_SMMU_REGS(as->smmu); | |
669 | ||
670 | spin_unlock_irqrestore(&as->lock, flags); | |
671 | ||
672 | return 0; | |
673 | ||
674 | err_out: | |
675 | spin_unlock_irqrestore(&as->lock, flags); | |
676 | ||
677 | devm_kfree(smmu->dev, cnt); | |
678 | if (page) | |
679 | __free_page(page); | |
680 | return err; | |
681 | } | |
682 | ||
683 | static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova) | |
684 | { | |
685 | unsigned long *pte; | |
686 | struct page *page; | |
687 | unsigned int *count; | |
688 | ||
689 | pte = locate_pte(as, iova, false, &page, &count); | |
690 | if (WARN_ON(!pte)) | |
691 | return; | |
692 | ||
693 | if (WARN_ON(*pte == _PTE_VACANT(iova))) | |
694 | return; | |
695 | ||
696 | *pte = _PTE_VACANT(iova); | |
697 | FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); | |
698 | flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0); | |
699 | if (!--(*count)) | |
700 | free_ptbl(as, iova); | |
701 | } | |
702 | ||
703 | static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova, | |
704 | unsigned long pfn) | |
705 | { | |
706 | struct smmu_device *smmu = as->smmu; | |
707 | unsigned long *pte; | |
708 | unsigned int *count; | |
709 | struct page *page; | |
710 | ||
711 | pte = locate_pte(as, iova, true, &page, &count); | |
712 | if (WARN_ON(!pte)) | |
713 | return; | |
714 | ||
715 | if (*pte == _PTE_VACANT(iova)) | |
716 | (*count)++; | |
717 | *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr); | |
718 | if (unlikely((*pte == _PTE_VACANT(iova)))) | |
719 | (*count)--; | |
720 | FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); | |
721 | flush_ptc_and_tlb(smmu, as, iova, pte, page, 0); | |
722 | put_signature(as, iova, pfn); | |
723 | } | |
724 | ||
725 | static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova, | |
726 | phys_addr_t pa, size_t bytes, int prot) | |
727 | { | |
728 | struct smmu_as *as = domain->priv; | |
729 | unsigned long pfn = __phys_to_pfn(pa); | |
730 | unsigned long flags; | |
731 | ||
732 | dev_dbg(as->smmu->dev, "[%d] %08lx:%08x\n", as->asid, iova, pa); | |
733 | ||
734 | if (!pfn_valid(pfn)) | |
735 | return -ENOMEM; | |
736 | ||
737 | spin_lock_irqsave(&as->lock, flags); | |
738 | __smmu_iommu_map_pfn(as, iova, pfn); | |
739 | spin_unlock_irqrestore(&as->lock, flags); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova, | |
744 | size_t bytes) | |
745 | { | |
746 | struct smmu_as *as = domain->priv; | |
747 | unsigned long flags; | |
748 | ||
749 | dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova); | |
750 | ||
751 | spin_lock_irqsave(&as->lock, flags); | |
752 | __smmu_iommu_unmap(as, iova); | |
753 | spin_unlock_irqrestore(&as->lock, flags); | |
754 | return SMMU_PAGE_SIZE; | |
755 | } | |
756 | ||
757 | static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain, | |
758 | unsigned long iova) | |
759 | { | |
760 | struct smmu_as *as = domain->priv; | |
761 | unsigned long *pte; | |
762 | unsigned int *count; | |
763 | struct page *page; | |
764 | unsigned long pfn; | |
765 | unsigned long flags; | |
766 | ||
767 | spin_lock_irqsave(&as->lock, flags); | |
768 | ||
769 | pte = locate_pte(as, iova, true, &page, &count); | |
770 | pfn = *pte & SMMU_PFN_MASK; | |
771 | WARN_ON(!pfn_valid(pfn)); | |
772 | dev_dbg(as->smmu->dev, | |
773 | "iova:%08lx pfn:%08lx asid:%d\n", iova, pfn, as->asid); | |
774 | ||
775 | spin_unlock_irqrestore(&as->lock, flags); | |
776 | return PFN_PHYS(pfn); | |
777 | } | |
778 | ||
779 | static int smmu_iommu_domain_has_cap(struct iommu_domain *domain, | |
780 | unsigned long cap) | |
781 | { | |
782 | return 0; | |
783 | } | |
784 | ||
785 | static int smmu_iommu_attach_dev(struct iommu_domain *domain, | |
786 | struct device *dev) | |
787 | { | |
788 | struct smmu_as *as = domain->priv; | |
789 | struct smmu_device *smmu = as->smmu; | |
790 | struct smmu_client *client, *c; | |
791 | u32 map; | |
792 | int err; | |
793 | ||
794 | client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL); | |
795 | if (!client) | |
796 | return -ENOMEM; | |
797 | client->dev = dev; | |
798 | client->as = as; | |
799 | map = (unsigned long)dev->platform_data; | |
800 | if (!map) | |
801 | return -EINVAL; | |
802 | ||
803 | err = smmu_client_enable_hwgrp(client, map); | |
804 | if (err) | |
805 | goto err_hwgrp; | |
806 | ||
807 | spin_lock(&as->client_lock); | |
808 | list_for_each_entry(c, &as->client, list) { | |
809 | if (c->dev == dev) { | |
810 | dev_err(smmu->dev, | |
811 | "%s is already attached\n", dev_name(c->dev)); | |
812 | err = -EINVAL; | |
813 | goto err_client; | |
814 | } | |
815 | } | |
816 | list_add(&client->list, &as->client); | |
817 | spin_unlock(&as->client_lock); | |
818 | ||
819 | /* | |
820 | * Reserve "page zero" for AVP vectors using a common dummy | |
821 | * page. | |
822 | */ | |
823 | if (map & HWG_AVPC) { | |
824 | struct page *page; | |
825 | ||
826 | page = as->smmu->avp_vector_page; | |
827 | __smmu_iommu_map_pfn(as, 0, page_to_pfn(page)); | |
828 | ||
829 | pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n"); | |
830 | } | |
831 | ||
832 | dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev)); | |
833 | return 0; | |
834 | ||
835 | err_client: | |
836 | smmu_client_disable_hwgrp(client); | |
837 | spin_unlock(&as->client_lock); | |
838 | err_hwgrp: | |
839 | devm_kfree(smmu->dev, client); | |
840 | return err; | |
841 | } | |
842 | ||
843 | static void smmu_iommu_detach_dev(struct iommu_domain *domain, | |
844 | struct device *dev) | |
845 | { | |
846 | struct smmu_as *as = domain->priv; | |
847 | struct smmu_device *smmu = as->smmu; | |
848 | struct smmu_client *c; | |
849 | ||
850 | spin_lock(&as->client_lock); | |
851 | ||
852 | list_for_each_entry(c, &as->client, list) { | |
853 | if (c->dev == dev) { | |
854 | smmu_client_disable_hwgrp(c); | |
855 | list_del(&c->list); | |
856 | devm_kfree(smmu->dev, c); | |
857 | c->as = NULL; | |
858 | dev_dbg(smmu->dev, | |
859 | "%s is detached\n", dev_name(c->dev)); | |
860 | goto out; | |
861 | } | |
862 | } | |
863 | dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev)); | |
864 | out: | |
865 | spin_unlock(&as->client_lock); | |
866 | } | |
867 | ||
868 | static int smmu_iommu_domain_init(struct iommu_domain *domain) | |
869 | { | |
870 | int i, err = -EAGAIN; | |
871 | unsigned long flags; | |
872 | struct smmu_as *as; | |
873 | struct smmu_device *smmu = smmu_handle; | |
874 | ||
875 | /* Look for a free AS with lock held */ | |
876 | for (i = 0; i < smmu->num_as; i++) { | |
877 | as = &smmu->as[i]; | |
878 | ||
879 | if (as->pdir_page) | |
880 | continue; | |
881 | ||
882 | err = alloc_pdir(as); | |
883 | if (!err) | |
884 | goto found; | |
885 | ||
886 | if (err != -EAGAIN) | |
887 | break; | |
888 | } | |
889 | if (i == smmu->num_as) | |
890 | dev_err(smmu->dev, "no free AS\n"); | |
891 | return err; | |
892 | ||
893 | found: | |
894 | spin_lock_irqsave(&smmu->lock, flags); | |
895 | ||
896 | /* Update PDIR register */ | |
897 | smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); | |
898 | smmu_write(smmu, | |
899 | SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA); | |
900 | FLUSH_SMMU_REGS(smmu); | |
901 | ||
902 | spin_unlock_irqrestore(&smmu->lock, flags); | |
903 | ||
904 | domain->priv = as; | |
905 | ||
906 | domain->geometry.aperture_start = smmu->iovmm_base; | |
907 | domain->geometry.aperture_end = smmu->iovmm_base + | |
908 | smmu->page_count * SMMU_PAGE_SIZE - 1; | |
909 | domain->geometry.force_aperture = true; | |
910 | ||
911 | dev_dbg(smmu->dev, "smmu_as@%p\n", as); | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | static void smmu_iommu_domain_destroy(struct iommu_domain *domain) | |
917 | { | |
918 | struct smmu_as *as = domain->priv; | |
919 | struct smmu_device *smmu = as->smmu; | |
920 | unsigned long flags; | |
921 | ||
922 | spin_lock_irqsave(&as->lock, flags); | |
923 | ||
924 | if (as->pdir_page) { | |
925 | spin_lock(&smmu->lock); | |
926 | smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); | |
927 | smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA); | |
928 | FLUSH_SMMU_REGS(smmu); | |
929 | spin_unlock(&smmu->lock); | |
930 | ||
931 | free_pdir(as); | |
932 | } | |
933 | ||
934 | if (!list_empty(&as->client)) { | |
935 | struct smmu_client *c; | |
936 | ||
937 | list_for_each_entry(c, &as->client, list) | |
938 | smmu_iommu_detach_dev(domain, c->dev); | |
939 | } | |
940 | ||
941 | spin_unlock_irqrestore(&as->lock, flags); | |
942 | ||
943 | domain->priv = NULL; | |
944 | dev_dbg(smmu->dev, "smmu_as@%p\n", as); | |
945 | } | |
946 | ||
947 | static struct iommu_ops smmu_iommu_ops = { | |
948 | .domain_init = smmu_iommu_domain_init, | |
949 | .domain_destroy = smmu_iommu_domain_destroy, | |
950 | .attach_dev = smmu_iommu_attach_dev, | |
951 | .detach_dev = smmu_iommu_detach_dev, | |
952 | .map = smmu_iommu_map, | |
953 | .unmap = smmu_iommu_unmap, | |
954 | .iova_to_phys = smmu_iommu_iova_to_phys, | |
955 | .domain_has_cap = smmu_iommu_domain_has_cap, | |
956 | .pgsize_bitmap = SMMU_IOMMU_PGSIZES, | |
957 | }; | |
958 | ||
959 | /* Should be in the order of enum */ | |
960 | static const char * const smmu_debugfs_mc[] = { "mc", }; | |
961 | static const char * const smmu_debugfs_cache[] = { "tlb", "ptc", }; | |
962 | ||
963 | static ssize_t smmu_debugfs_stats_write(struct file *file, | |
964 | const char __user *buffer, | |
965 | size_t count, loff_t *pos) | |
966 | { | |
967 | struct smmu_debugfs_info *info; | |
968 | struct smmu_device *smmu; | |
969 | struct dentry *dent; | |
970 | int i; | |
971 | enum { | |
972 | _OFF = 0, | |
973 | _ON, | |
974 | _RESET, | |
975 | }; | |
976 | const char * const command[] = { | |
977 | [_OFF] = "off", | |
978 | [_ON] = "on", | |
979 | [_RESET] = "reset", | |
980 | }; | |
981 | char str[] = "reset"; | |
982 | u32 val; | |
983 | size_t offs; | |
984 | ||
985 | count = min_t(size_t, count, sizeof(str)); | |
986 | if (copy_from_user(str, buffer, count)) | |
987 | return -EINVAL; | |
988 | ||
989 | for (i = 0; i < ARRAY_SIZE(command); i++) | |
990 | if (strncmp(str, command[i], | |
991 | strlen(command[i])) == 0) | |
992 | break; | |
993 | ||
994 | if (i == ARRAY_SIZE(command)) | |
995 | return -EINVAL; | |
996 | ||
997 | dent = file->f_dentry; | |
998 | info = dent->d_inode->i_private; | |
999 | smmu = info->smmu; | |
1000 | ||
1001 | offs = SMMU_CACHE_CONFIG(info->cache); | |
1002 | val = smmu_read(smmu, offs); | |
1003 | switch (i) { | |
1004 | case _OFF: | |
1005 | val &= ~SMMU_CACHE_CONFIG_STATS_ENABLE; | |
1006 | val &= ~SMMU_CACHE_CONFIG_STATS_TEST; | |
1007 | smmu_write(smmu, val, offs); | |
1008 | break; | |
1009 | case _ON: | |
1010 | val |= SMMU_CACHE_CONFIG_STATS_ENABLE; | |
1011 | val &= ~SMMU_CACHE_CONFIG_STATS_TEST; | |
1012 | smmu_write(smmu, val, offs); | |
1013 | break; | |
1014 | case _RESET: | |
1015 | val |= SMMU_CACHE_CONFIG_STATS_TEST; | |
1016 | smmu_write(smmu, val, offs); | |
1017 | val &= ~SMMU_CACHE_CONFIG_STATS_TEST; | |
1018 | smmu_write(smmu, val, offs); | |
1019 | break; | |
1020 | default: | |
1021 | BUG(); | |
1022 | break; | |
1023 | } | |
1024 | ||
1025 | dev_dbg(smmu->dev, "%s() %08x, %08x @%08x\n", __func__, | |
1026 | val, smmu_read(smmu, offs), offs); | |
1027 | ||
1028 | return count; | |
1029 | } | |
1030 | ||
1031 | static int smmu_debugfs_stats_show(struct seq_file *s, void *v) | |
1032 | { | |
1033 | struct smmu_debugfs_info *info; | |
1034 | struct smmu_device *smmu; | |
1035 | struct dentry *dent; | |
1036 | int i; | |
1037 | const char * const stats[] = { "hit", "miss", }; | |
1038 | ||
1039 | dent = d_find_alias(s->private); | |
1040 | info = dent->d_inode->i_private; | |
1041 | smmu = info->smmu; | |
1042 | ||
1043 | for (i = 0; i < ARRAY_SIZE(stats); i++) { | |
1044 | u32 val; | |
1045 | size_t offs; | |
1046 | ||
1047 | offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i); | |
1048 | val = smmu_read(smmu, offs); | |
1049 | seq_printf(s, "%s:%08x ", stats[i], val); | |
1050 | ||
1051 | dev_dbg(smmu->dev, "%s() %s %08x @%08x\n", __func__, | |
1052 | stats[i], val, offs); | |
1053 | } | |
1054 | seq_printf(s, "\n"); | |
1055 | dput(dent); | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | static int smmu_debugfs_stats_open(struct inode *inode, struct file *file) | |
1061 | { | |
1062 | return single_open(file, smmu_debugfs_stats_show, inode); | |
1063 | } | |
1064 | ||
1065 | static const struct file_operations smmu_debugfs_stats_fops = { | |
1066 | .open = smmu_debugfs_stats_open, | |
1067 | .read = seq_read, | |
1068 | .llseek = seq_lseek, | |
1069 | .release = single_release, | |
1070 | .write = smmu_debugfs_stats_write, | |
1071 | }; | |
1072 | ||
1073 | static void smmu_debugfs_delete(struct smmu_device *smmu) | |
1074 | { | |
1075 | debugfs_remove_recursive(smmu->debugfs_root); | |
1076 | kfree(smmu->debugfs_info); | |
1077 | } | |
1078 | ||
1079 | static void smmu_debugfs_create(struct smmu_device *smmu) | |
1080 | { | |
1081 | int i; | |
1082 | size_t bytes; | |
1083 | struct dentry *root; | |
1084 | ||
1085 | bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) * | |
1086 | sizeof(*smmu->debugfs_info); | |
1087 | smmu->debugfs_info = kmalloc(bytes, GFP_KERNEL); | |
1088 | if (!smmu->debugfs_info) | |
1089 | return; | |
1090 | ||
1091 | root = debugfs_create_dir(dev_name(smmu->dev), NULL); | |
1092 | if (!root) | |
1093 | goto err_out; | |
1094 | smmu->debugfs_root = root; | |
1095 | ||
1096 | for (i = 0; i < ARRAY_SIZE(smmu_debugfs_mc); i++) { | |
1097 | int j; | |
1098 | struct dentry *mc; | |
1099 | ||
1100 | mc = debugfs_create_dir(smmu_debugfs_mc[i], root); | |
1101 | if (!mc) | |
1102 | goto err_out; | |
1103 | ||
1104 | for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) { | |
1105 | struct dentry *cache; | |
1106 | struct smmu_debugfs_info *info; | |
1107 | ||
1108 | info = smmu->debugfs_info; | |
1109 | info += i * ARRAY_SIZE(smmu_debugfs_mc) + j; | |
1110 | info->smmu = smmu; | |
1111 | info->mc = i; | |
1112 | info->cache = j; | |
1113 | ||
1114 | cache = debugfs_create_file(smmu_debugfs_cache[j], | |
1115 | S_IWUGO | S_IRUGO, mc, | |
1116 | (void *)info, | |
1117 | &smmu_debugfs_stats_fops); | |
1118 | if (!cache) | |
1119 | goto err_out; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | return; | |
1124 | ||
1125 | err_out: | |
1126 | smmu_debugfs_delete(smmu); | |
1127 | } | |
1128 | ||
1129 | static int tegra_smmu_suspend(struct device *dev) | |
1130 | { | |
1131 | struct smmu_device *smmu = dev_get_drvdata(dev); | |
1132 | ||
1133 | smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0); | |
1134 | smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1); | |
1135 | smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2); | |
1136 | smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY); | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static int tegra_smmu_resume(struct device *dev) | |
1141 | { | |
1142 | struct smmu_device *smmu = dev_get_drvdata(dev); | |
1143 | unsigned long flags; | |
1144 | int err; | |
1145 | ||
1146 | spin_lock_irqsave(&smmu->lock, flags); | |
1147 | err = smmu_setup_regs(smmu); | |
1148 | spin_unlock_irqrestore(&smmu->lock, flags); | |
1149 | return err; | |
1150 | } | |
1151 | ||
1152 | static int tegra_smmu_probe(struct platform_device *pdev) | |
1153 | { | |
1154 | struct smmu_device *smmu; | |
1155 | struct device *dev = &pdev->dev; | |
1156 | int i, asids, err = 0; | |
1157 | dma_addr_t uninitialized_var(base); | |
1158 | size_t bytes, uninitialized_var(size); | |
1159 | ||
1160 | if (smmu_handle) | |
1161 | return -EIO; | |
1162 | ||
1163 | BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT); | |
1164 | ||
1165 | if (of_property_read_u32(dev->of_node, "nvidia,#asids", &asids)) | |
1166 | return -ENODEV; | |
1167 | ||
1168 | bytes = sizeof(*smmu) + asids * sizeof(*smmu->as); | |
1169 | smmu = devm_kzalloc(dev, bytes, GFP_KERNEL); | |
1170 | if (!smmu) { | |
1171 | dev_err(dev, "failed to allocate smmu_device\n"); | |
1172 | return -ENOMEM; | |
1173 | } | |
1174 | ||
1175 | smmu->nregs = pdev->num_resources; | |
1176 | smmu->regs = devm_kzalloc(dev, 2 * smmu->nregs * sizeof(*smmu->regs), | |
1177 | GFP_KERNEL); | |
1178 | smmu->rege = smmu->regs + smmu->nregs; | |
1179 | if (!smmu->regs) | |
1180 | return -ENOMEM; | |
1181 | for (i = 0; i < smmu->nregs; i++) { | |
1182 | struct resource *res; | |
1183 | ||
1184 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); | |
1185 | if (!res) | |
1186 | return -ENODEV; | |
1187 | smmu->regs[i] = devm_request_and_ioremap(&pdev->dev, res); | |
1188 | if (!smmu->regs[i]) | |
1189 | return -EBUSY; | |
1190 | smmu->rege[i] = smmu->regs[i] + resource_size(res) - 1; | |
1191 | } | |
1192 | /* Same as "mc" 1st regiter block start address */ | |
1193 | smmu->regbase = (void __iomem *)((u32)smmu->regs[0] & ~PAGE_MASK); | |
1194 | ||
1195 | err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size); | |
1196 | if (err) | |
1197 | return -ENODEV; | |
1198 | ||
1199 | if (size & SMMU_PAGE_MASK) | |
1200 | return -EINVAL; | |
1201 | ||
1202 | size >>= SMMU_PAGE_SHIFT; | |
1203 | if (!size) | |
1204 | return -EINVAL; | |
1205 | ||
1206 | smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0); | |
1207 | if (!smmu->ahb) | |
1208 | return -ENODEV; | |
1209 | ||
1210 | smmu->dev = dev; | |
1211 | smmu->num_as = asids; | |
1212 | smmu->iovmm_base = base; | |
1213 | smmu->page_count = size; | |
1214 | ||
1215 | smmu->translation_enable_0 = ~0; | |
1216 | smmu->translation_enable_1 = ~0; | |
1217 | smmu->translation_enable_2 = ~0; | |
1218 | smmu->asid_security = 0; | |
1219 | ||
1220 | for (i = 0; i < smmu->num_as; i++) { | |
1221 | struct smmu_as *as = &smmu->as[i]; | |
1222 | ||
1223 | as->smmu = smmu; | |
1224 | as->asid = i; | |
1225 | as->pdir_attr = _PDIR_ATTR; | |
1226 | as->pde_attr = _PDE_ATTR; | |
1227 | as->pte_attr = _PTE_ATTR; | |
1228 | ||
1229 | spin_lock_init(&as->lock); | |
1230 | spin_lock_init(&as->client_lock); | |
1231 | INIT_LIST_HEAD(&as->client); | |
1232 | } | |
1233 | spin_lock_init(&smmu->lock); | |
1234 | err = smmu_setup_regs(smmu); | |
1235 | if (err) | |
1236 | return err; | |
1237 | platform_set_drvdata(pdev, smmu); | |
1238 | ||
1239 | smmu->avp_vector_page = alloc_page(GFP_KERNEL); | |
1240 | if (!smmu->avp_vector_page) | |
1241 | return -ENOMEM; | |
1242 | ||
1243 | smmu_debugfs_create(smmu); | |
1244 | smmu_handle = smmu; | |
1245 | bus_set_iommu(&platform_bus_type, &smmu_iommu_ops); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | static int tegra_smmu_remove(struct platform_device *pdev) | |
1250 | { | |
1251 | struct smmu_device *smmu = platform_get_drvdata(pdev); | |
1252 | int i; | |
1253 | ||
1254 | smmu_debugfs_delete(smmu); | |
1255 | ||
1256 | smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG); | |
1257 | for (i = 0; i < smmu->num_as; i++) | |
1258 | free_pdir(&smmu->as[i]); | |
1259 | __free_page(smmu->avp_vector_page); | |
1260 | smmu_handle = NULL; | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | const struct dev_pm_ops tegra_smmu_pm_ops = { | |
1265 | .suspend = tegra_smmu_suspend, | |
1266 | .resume = tegra_smmu_resume, | |
1267 | }; | |
1268 | ||
1269 | #ifdef CONFIG_OF | |
1270 | static struct of_device_id tegra_smmu_of_match[] = { | |
1271 | { .compatible = "nvidia,tegra30-smmu", }, | |
1272 | { }, | |
1273 | }; | |
1274 | MODULE_DEVICE_TABLE(of, tegra_smmu_of_match); | |
1275 | #endif | |
1276 | ||
1277 | static struct platform_driver tegra_smmu_driver = { | |
1278 | .probe = tegra_smmu_probe, | |
1279 | .remove = tegra_smmu_remove, | |
1280 | .driver = { | |
1281 | .owner = THIS_MODULE, | |
1282 | .name = "tegra-smmu", | |
1283 | .pm = &tegra_smmu_pm_ops, | |
1284 | .of_match_table = of_match_ptr(tegra_smmu_of_match), | |
1285 | }, | |
1286 | }; | |
1287 | ||
1288 | static int tegra_smmu_init(void) | |
1289 | { | |
1290 | return platform_driver_register(&tegra_smmu_driver); | |
1291 | } | |
1292 | ||
1293 | static void __exit tegra_smmu_exit(void) | |
1294 | { | |
1295 | platform_driver_unregister(&tegra_smmu_driver); | |
1296 | } | |
1297 | ||
1298 | subsys_initcall(tegra_smmu_init); | |
1299 | module_exit(tegra_smmu_exit); | |
1300 | ||
1301 | MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30"); | |
1302 | MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>"); | |
1303 | MODULE_ALIAS("platform:tegra-smmu"); | |
1304 | MODULE_LICENSE("GPL v2"); |