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45ae7cff WD |
1 | /* |
2 | * IOMMU API for ARM architected SMMU implementations. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
16 | * | |
17 | * Copyright (C) 2013 ARM Limited | |
18 | * | |
19 | * Author: Will Deacon <will.deacon@arm.com> | |
20 | * | |
21 | * This driver currently supports: | |
22 | * - SMMUv1 and v2 implementations | |
23 | * - Stream-matching and stream-indexing | |
24 | * - v7/v8 long-descriptor format | |
25 | * - Non-secure access to the SMMU | |
26 | * - 4k and 64k pages, with contiguous pte hints. | |
27 | * - Up to 39-bit addressing | |
28 | * - Context fault reporting | |
29 | */ | |
30 | ||
31 | #define pr_fmt(fmt) "arm-smmu: " fmt | |
32 | ||
33 | #include <linux/delay.h> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/io.h> | |
38 | #include <linux/iommu.h> | |
39 | #include <linux/mm.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/of.h> | |
42 | #include <linux/platform_device.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/spinlock.h> | |
45 | ||
46 | #include <linux/amba/bus.h> | |
47 | ||
48 | #include <asm/pgalloc.h> | |
49 | ||
50 | /* Maximum number of stream IDs assigned to a single device */ | |
51 | #define MAX_MASTER_STREAMIDS 8 | |
52 | ||
53 | /* Maximum number of context banks per SMMU */ | |
54 | #define ARM_SMMU_MAX_CBS 128 | |
55 | ||
56 | /* Maximum number of mapping groups per SMMU */ | |
57 | #define ARM_SMMU_MAX_SMRS 128 | |
58 | ||
45ae7cff WD |
59 | /* SMMU global address space */ |
60 | #define ARM_SMMU_GR0(smmu) ((smmu)->base) | |
61 | #define ARM_SMMU_GR1(smmu) ((smmu)->base + (smmu)->pagesize) | |
62 | ||
63 | /* Page table bits */ | |
64 | #define ARM_SMMU_PTE_PAGE (((pteval_t)3) << 0) | |
65 | #define ARM_SMMU_PTE_CONT (((pteval_t)1) << 52) | |
66 | #define ARM_SMMU_PTE_AF (((pteval_t)1) << 10) | |
67 | #define ARM_SMMU_PTE_SH_NS (((pteval_t)0) << 8) | |
68 | #define ARM_SMMU_PTE_SH_OS (((pteval_t)2) << 8) | |
69 | #define ARM_SMMU_PTE_SH_IS (((pteval_t)3) << 8) | |
70 | ||
71 | #if PAGE_SIZE == SZ_4K | |
72 | #define ARM_SMMU_PTE_CONT_ENTRIES 16 | |
73 | #elif PAGE_SIZE == SZ_64K | |
74 | #define ARM_SMMU_PTE_CONT_ENTRIES 32 | |
75 | #else | |
76 | #define ARM_SMMU_PTE_CONT_ENTRIES 1 | |
77 | #endif | |
78 | ||
79 | #define ARM_SMMU_PTE_CONT_SIZE (PAGE_SIZE * ARM_SMMU_PTE_CONT_ENTRIES) | |
80 | #define ARM_SMMU_PTE_CONT_MASK (~(ARM_SMMU_PTE_CONT_SIZE - 1)) | |
81 | #define ARM_SMMU_PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(pte_t)) | |
82 | ||
83 | /* Stage-1 PTE */ | |
84 | #define ARM_SMMU_PTE_AP_UNPRIV (((pteval_t)1) << 6) | |
85 | #define ARM_SMMU_PTE_AP_RDONLY (((pteval_t)2) << 6) | |
86 | #define ARM_SMMU_PTE_ATTRINDX_SHIFT 2 | |
1463fe44 | 87 | #define ARM_SMMU_PTE_nG (((pteval_t)1) << 11) |
45ae7cff WD |
88 | |
89 | /* Stage-2 PTE */ | |
90 | #define ARM_SMMU_PTE_HAP_FAULT (((pteval_t)0) << 6) | |
91 | #define ARM_SMMU_PTE_HAP_READ (((pteval_t)1) << 6) | |
92 | #define ARM_SMMU_PTE_HAP_WRITE (((pteval_t)2) << 6) | |
93 | #define ARM_SMMU_PTE_MEMATTR_OIWB (((pteval_t)0xf) << 2) | |
94 | #define ARM_SMMU_PTE_MEMATTR_NC (((pteval_t)0x5) << 2) | |
95 | #define ARM_SMMU_PTE_MEMATTR_DEV (((pteval_t)0x1) << 2) | |
96 | ||
97 | /* Configuration registers */ | |
98 | #define ARM_SMMU_GR0_sCR0 0x0 | |
99 | #define sCR0_CLIENTPD (1 << 0) | |
100 | #define sCR0_GFRE (1 << 1) | |
101 | #define sCR0_GFIE (1 << 2) | |
102 | #define sCR0_GCFGFRE (1 << 4) | |
103 | #define sCR0_GCFGFIE (1 << 5) | |
104 | #define sCR0_USFCFG (1 << 10) | |
105 | #define sCR0_VMIDPNE (1 << 11) | |
106 | #define sCR0_PTM (1 << 12) | |
107 | #define sCR0_FB (1 << 13) | |
108 | #define sCR0_BSU_SHIFT 14 | |
109 | #define sCR0_BSU_MASK 0x3 | |
110 | ||
111 | /* Identification registers */ | |
112 | #define ARM_SMMU_GR0_ID0 0x20 | |
113 | #define ARM_SMMU_GR0_ID1 0x24 | |
114 | #define ARM_SMMU_GR0_ID2 0x28 | |
115 | #define ARM_SMMU_GR0_ID3 0x2c | |
116 | #define ARM_SMMU_GR0_ID4 0x30 | |
117 | #define ARM_SMMU_GR0_ID5 0x34 | |
118 | #define ARM_SMMU_GR0_ID6 0x38 | |
119 | #define ARM_SMMU_GR0_ID7 0x3c | |
120 | #define ARM_SMMU_GR0_sGFSR 0x48 | |
121 | #define ARM_SMMU_GR0_sGFSYNR0 0x50 | |
122 | #define ARM_SMMU_GR0_sGFSYNR1 0x54 | |
123 | #define ARM_SMMU_GR0_sGFSYNR2 0x58 | |
124 | #define ARM_SMMU_GR0_PIDR0 0xfe0 | |
125 | #define ARM_SMMU_GR0_PIDR1 0xfe4 | |
126 | #define ARM_SMMU_GR0_PIDR2 0xfe8 | |
127 | ||
128 | #define ID0_S1TS (1 << 30) | |
129 | #define ID0_S2TS (1 << 29) | |
130 | #define ID0_NTS (1 << 28) | |
131 | #define ID0_SMS (1 << 27) | |
132 | #define ID0_PTFS_SHIFT 24 | |
133 | #define ID0_PTFS_MASK 0x2 | |
134 | #define ID0_PTFS_V8_ONLY 0x2 | |
135 | #define ID0_CTTW (1 << 14) | |
136 | #define ID0_NUMIRPT_SHIFT 16 | |
137 | #define ID0_NUMIRPT_MASK 0xff | |
138 | #define ID0_NUMSMRG_SHIFT 0 | |
139 | #define ID0_NUMSMRG_MASK 0xff | |
140 | ||
141 | #define ID1_PAGESIZE (1 << 31) | |
142 | #define ID1_NUMPAGENDXB_SHIFT 28 | |
143 | #define ID1_NUMPAGENDXB_MASK 7 | |
144 | #define ID1_NUMS2CB_SHIFT 16 | |
145 | #define ID1_NUMS2CB_MASK 0xff | |
146 | #define ID1_NUMCB_SHIFT 0 | |
147 | #define ID1_NUMCB_MASK 0xff | |
148 | ||
149 | #define ID2_OAS_SHIFT 4 | |
150 | #define ID2_OAS_MASK 0xf | |
151 | #define ID2_IAS_SHIFT 0 | |
152 | #define ID2_IAS_MASK 0xf | |
153 | #define ID2_UBS_SHIFT 8 | |
154 | #define ID2_UBS_MASK 0xf | |
155 | #define ID2_PTFS_4K (1 << 12) | |
156 | #define ID2_PTFS_16K (1 << 13) | |
157 | #define ID2_PTFS_64K (1 << 14) | |
158 | ||
159 | #define PIDR2_ARCH_SHIFT 4 | |
160 | #define PIDR2_ARCH_MASK 0xf | |
161 | ||
162 | /* Global TLB invalidation */ | |
163 | #define ARM_SMMU_GR0_STLBIALL 0x60 | |
164 | #define ARM_SMMU_GR0_TLBIVMID 0x64 | |
165 | #define ARM_SMMU_GR0_TLBIALLNSNH 0x68 | |
166 | #define ARM_SMMU_GR0_TLBIALLH 0x6c | |
167 | #define ARM_SMMU_GR0_sTLBGSYNC 0x70 | |
168 | #define ARM_SMMU_GR0_sTLBGSTATUS 0x74 | |
169 | #define sTLBGSTATUS_GSACTIVE (1 << 0) | |
170 | #define TLB_LOOP_TIMEOUT 1000000 /* 1s! */ | |
171 | ||
172 | /* Stream mapping registers */ | |
173 | #define ARM_SMMU_GR0_SMR(n) (0x800 + ((n) << 2)) | |
174 | #define SMR_VALID (1 << 31) | |
175 | #define SMR_MASK_SHIFT 16 | |
176 | #define SMR_MASK_MASK 0x7fff | |
177 | #define SMR_ID_SHIFT 0 | |
178 | #define SMR_ID_MASK 0x7fff | |
179 | ||
180 | #define ARM_SMMU_GR0_S2CR(n) (0xc00 + ((n) << 2)) | |
181 | #define S2CR_CBNDX_SHIFT 0 | |
182 | #define S2CR_CBNDX_MASK 0xff | |
183 | #define S2CR_TYPE_SHIFT 16 | |
184 | #define S2CR_TYPE_MASK 0x3 | |
185 | #define S2CR_TYPE_TRANS (0 << S2CR_TYPE_SHIFT) | |
186 | #define S2CR_TYPE_BYPASS (1 << S2CR_TYPE_SHIFT) | |
187 | #define S2CR_TYPE_FAULT (2 << S2CR_TYPE_SHIFT) | |
188 | ||
189 | /* Context bank attribute registers */ | |
190 | #define ARM_SMMU_GR1_CBAR(n) (0x0 + ((n) << 2)) | |
191 | #define CBAR_VMID_SHIFT 0 | |
192 | #define CBAR_VMID_MASK 0xff | |
193 | #define CBAR_S1_MEMATTR_SHIFT 12 | |
194 | #define CBAR_S1_MEMATTR_MASK 0xf | |
195 | #define CBAR_S1_MEMATTR_WB 0xf | |
196 | #define CBAR_TYPE_SHIFT 16 | |
197 | #define CBAR_TYPE_MASK 0x3 | |
198 | #define CBAR_TYPE_S2_TRANS (0 << CBAR_TYPE_SHIFT) | |
199 | #define CBAR_TYPE_S1_TRANS_S2_BYPASS (1 << CBAR_TYPE_SHIFT) | |
200 | #define CBAR_TYPE_S1_TRANS_S2_FAULT (2 << CBAR_TYPE_SHIFT) | |
201 | #define CBAR_TYPE_S1_TRANS_S2_TRANS (3 << CBAR_TYPE_SHIFT) | |
202 | #define CBAR_IRPTNDX_SHIFT 24 | |
203 | #define CBAR_IRPTNDX_MASK 0xff | |
204 | ||
205 | #define ARM_SMMU_GR1_CBA2R(n) (0x800 + ((n) << 2)) | |
206 | #define CBA2R_RW64_32BIT (0 << 0) | |
207 | #define CBA2R_RW64_64BIT (1 << 0) | |
208 | ||
209 | /* Translation context bank */ | |
210 | #define ARM_SMMU_CB_BASE(smmu) ((smmu)->base + ((smmu)->size >> 1)) | |
211 | #define ARM_SMMU_CB(smmu, n) ((n) * (smmu)->pagesize) | |
212 | ||
213 | #define ARM_SMMU_CB_SCTLR 0x0 | |
214 | #define ARM_SMMU_CB_RESUME 0x8 | |
215 | #define ARM_SMMU_CB_TTBCR2 0x10 | |
216 | #define ARM_SMMU_CB_TTBR0_LO 0x20 | |
217 | #define ARM_SMMU_CB_TTBR0_HI 0x24 | |
218 | #define ARM_SMMU_CB_TTBCR 0x30 | |
219 | #define ARM_SMMU_CB_S1_MAIR0 0x38 | |
220 | #define ARM_SMMU_CB_FSR 0x58 | |
221 | #define ARM_SMMU_CB_FAR_LO 0x60 | |
222 | #define ARM_SMMU_CB_FAR_HI 0x64 | |
223 | #define ARM_SMMU_CB_FSYNR0 0x68 | |
1463fe44 | 224 | #define ARM_SMMU_CB_S1_TLBIASID 0x610 |
45ae7cff WD |
225 | |
226 | #define SCTLR_S1_ASIDPNE (1 << 12) | |
227 | #define SCTLR_CFCFG (1 << 7) | |
228 | #define SCTLR_CFIE (1 << 6) | |
229 | #define SCTLR_CFRE (1 << 5) | |
230 | #define SCTLR_E (1 << 4) | |
231 | #define SCTLR_AFE (1 << 2) | |
232 | #define SCTLR_TRE (1 << 1) | |
233 | #define SCTLR_M (1 << 0) | |
234 | #define SCTLR_EAE_SBOP (SCTLR_AFE | SCTLR_TRE) | |
235 | ||
236 | #define RESUME_RETRY (0 << 0) | |
237 | #define RESUME_TERMINATE (1 << 0) | |
238 | ||
239 | #define TTBCR_EAE (1 << 31) | |
240 | ||
241 | #define TTBCR_PASIZE_SHIFT 16 | |
242 | #define TTBCR_PASIZE_MASK 0x7 | |
243 | ||
244 | #define TTBCR_TG0_4K (0 << 14) | |
245 | #define TTBCR_TG0_64K (1 << 14) | |
246 | ||
247 | #define TTBCR_SH0_SHIFT 12 | |
248 | #define TTBCR_SH0_MASK 0x3 | |
249 | #define TTBCR_SH_NS 0 | |
250 | #define TTBCR_SH_OS 2 | |
251 | #define TTBCR_SH_IS 3 | |
252 | ||
253 | #define TTBCR_ORGN0_SHIFT 10 | |
254 | #define TTBCR_IRGN0_SHIFT 8 | |
255 | #define TTBCR_RGN_MASK 0x3 | |
256 | #define TTBCR_RGN_NC 0 | |
257 | #define TTBCR_RGN_WBWA 1 | |
258 | #define TTBCR_RGN_WT 2 | |
259 | #define TTBCR_RGN_WB 3 | |
260 | ||
261 | #define TTBCR_SL0_SHIFT 6 | |
262 | #define TTBCR_SL0_MASK 0x3 | |
263 | #define TTBCR_SL0_LVL_2 0 | |
264 | #define TTBCR_SL0_LVL_1 1 | |
265 | ||
266 | #define TTBCR_T1SZ_SHIFT 16 | |
267 | #define TTBCR_T0SZ_SHIFT 0 | |
268 | #define TTBCR_SZ_MASK 0xf | |
269 | ||
270 | #define TTBCR2_SEP_SHIFT 15 | |
271 | #define TTBCR2_SEP_MASK 0x7 | |
272 | ||
273 | #define TTBCR2_PASIZE_SHIFT 0 | |
274 | #define TTBCR2_PASIZE_MASK 0x7 | |
275 | ||
276 | /* Common definitions for PASize and SEP fields */ | |
277 | #define TTBCR2_ADDR_32 0 | |
278 | #define TTBCR2_ADDR_36 1 | |
279 | #define TTBCR2_ADDR_40 2 | |
280 | #define TTBCR2_ADDR_42 3 | |
281 | #define TTBCR2_ADDR_44 4 | |
282 | #define TTBCR2_ADDR_48 5 | |
283 | ||
1463fe44 WD |
284 | #define TTBRn_HI_ASID_SHIFT 16 |
285 | ||
45ae7cff WD |
286 | #define MAIR_ATTR_SHIFT(n) ((n) << 3) |
287 | #define MAIR_ATTR_MASK 0xff | |
288 | #define MAIR_ATTR_DEVICE 0x04 | |
289 | #define MAIR_ATTR_NC 0x44 | |
290 | #define MAIR_ATTR_WBRWA 0xff | |
291 | #define MAIR_ATTR_IDX_NC 0 | |
292 | #define MAIR_ATTR_IDX_CACHE 1 | |
293 | #define MAIR_ATTR_IDX_DEV 2 | |
294 | ||
295 | #define FSR_MULTI (1 << 31) | |
296 | #define FSR_SS (1 << 30) | |
297 | #define FSR_UUT (1 << 8) | |
298 | #define FSR_ASF (1 << 7) | |
299 | #define FSR_TLBLKF (1 << 6) | |
300 | #define FSR_TLBMCF (1 << 5) | |
301 | #define FSR_EF (1 << 4) | |
302 | #define FSR_PF (1 << 3) | |
303 | #define FSR_AFF (1 << 2) | |
304 | #define FSR_TF (1 << 1) | |
305 | ||
306 | #define FSR_IGN (FSR_AFF | FSR_ASF | FSR_TLBMCF | \ | |
307 | FSR_TLBLKF) | |
308 | #define FSR_FAULT (FSR_MULTI | FSR_SS | FSR_UUT | \ | |
adaba320 | 309 | FSR_EF | FSR_PF | FSR_TF | FSR_IGN) |
45ae7cff WD |
310 | |
311 | #define FSYNR0_WNR (1 << 4) | |
312 | ||
313 | struct arm_smmu_smr { | |
314 | u8 idx; | |
315 | u16 mask; | |
316 | u16 id; | |
317 | }; | |
318 | ||
319 | struct arm_smmu_master { | |
320 | struct device_node *of_node; | |
321 | ||
322 | /* | |
323 | * The following is specific to the master's position in the | |
324 | * SMMU chain. | |
325 | */ | |
326 | struct rb_node node; | |
327 | int num_streamids; | |
328 | u16 streamids[MAX_MASTER_STREAMIDS]; | |
329 | ||
330 | /* | |
331 | * We only need to allocate these on the root SMMU, as we | |
332 | * configure unmatched streams to bypass translation. | |
333 | */ | |
334 | struct arm_smmu_smr *smrs; | |
335 | }; | |
336 | ||
337 | struct arm_smmu_device { | |
338 | struct device *dev; | |
339 | struct device_node *parent_of_node; | |
340 | ||
341 | void __iomem *base; | |
342 | unsigned long size; | |
343 | unsigned long pagesize; | |
344 | ||
345 | #define ARM_SMMU_FEAT_COHERENT_WALK (1 << 0) | |
346 | #define ARM_SMMU_FEAT_STREAM_MATCH (1 << 1) | |
347 | #define ARM_SMMU_FEAT_TRANS_S1 (1 << 2) | |
348 | #define ARM_SMMU_FEAT_TRANS_S2 (1 << 3) | |
349 | #define ARM_SMMU_FEAT_TRANS_NESTED (1 << 4) | |
350 | u32 features; | |
351 | int version; | |
352 | ||
353 | u32 num_context_banks; | |
354 | u32 num_s2_context_banks; | |
355 | DECLARE_BITMAP(context_map, ARM_SMMU_MAX_CBS); | |
356 | atomic_t irptndx; | |
357 | ||
358 | u32 num_mapping_groups; | |
359 | DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS); | |
360 | ||
361 | unsigned long input_size; | |
362 | unsigned long s1_output_size; | |
363 | unsigned long s2_output_size; | |
364 | ||
365 | u32 num_global_irqs; | |
366 | u32 num_context_irqs; | |
367 | unsigned int *irqs; | |
368 | ||
45ae7cff WD |
369 | struct list_head list; |
370 | struct rb_root masters; | |
371 | }; | |
372 | ||
373 | struct arm_smmu_cfg { | |
374 | struct arm_smmu_device *smmu; | |
45ae7cff WD |
375 | u8 cbndx; |
376 | u8 irptndx; | |
377 | u32 cbar; | |
378 | pgd_t *pgd; | |
379 | }; | |
faea13b7 | 380 | #define INVALID_IRPTNDX 0xff |
45ae7cff | 381 | |
ecfadb6e WD |
382 | #define ARM_SMMU_CB_ASID(cfg) ((cfg)->cbndx) |
383 | #define ARM_SMMU_CB_VMID(cfg) ((cfg)->cbndx + 1) | |
384 | ||
45ae7cff WD |
385 | struct arm_smmu_domain { |
386 | /* | |
387 | * A domain can span across multiple, chained SMMUs and requires | |
388 | * all devices within the domain to follow the same translation | |
389 | * path. | |
390 | */ | |
391 | struct arm_smmu_device *leaf_smmu; | |
392 | struct arm_smmu_cfg root_cfg; | |
393 | phys_addr_t output_mask; | |
394 | ||
395 | spinlock_t lock; | |
396 | }; | |
397 | ||
398 | static DEFINE_SPINLOCK(arm_smmu_devices_lock); | |
399 | static LIST_HEAD(arm_smmu_devices); | |
400 | ||
401 | static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu, | |
402 | struct device_node *dev_node) | |
403 | { | |
404 | struct rb_node *node = smmu->masters.rb_node; | |
405 | ||
406 | while (node) { | |
407 | struct arm_smmu_master *master; | |
408 | master = container_of(node, struct arm_smmu_master, node); | |
409 | ||
410 | if (dev_node < master->of_node) | |
411 | node = node->rb_left; | |
412 | else if (dev_node > master->of_node) | |
413 | node = node->rb_right; | |
414 | else | |
415 | return master; | |
416 | } | |
417 | ||
418 | return NULL; | |
419 | } | |
420 | ||
421 | static int insert_smmu_master(struct arm_smmu_device *smmu, | |
422 | struct arm_smmu_master *master) | |
423 | { | |
424 | struct rb_node **new, *parent; | |
425 | ||
426 | new = &smmu->masters.rb_node; | |
427 | parent = NULL; | |
428 | while (*new) { | |
429 | struct arm_smmu_master *this; | |
430 | this = container_of(*new, struct arm_smmu_master, node); | |
431 | ||
432 | parent = *new; | |
433 | if (master->of_node < this->of_node) | |
434 | new = &((*new)->rb_left); | |
435 | else if (master->of_node > this->of_node) | |
436 | new = &((*new)->rb_right); | |
437 | else | |
438 | return -EEXIST; | |
439 | } | |
440 | ||
441 | rb_link_node(&master->node, parent, new); | |
442 | rb_insert_color(&master->node, &smmu->masters); | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static int register_smmu_master(struct arm_smmu_device *smmu, | |
447 | struct device *dev, | |
448 | struct of_phandle_args *masterspec) | |
449 | { | |
450 | int i; | |
451 | struct arm_smmu_master *master; | |
452 | ||
453 | master = find_smmu_master(smmu, masterspec->np); | |
454 | if (master) { | |
455 | dev_err(dev, | |
456 | "rejecting multiple registrations for master device %s\n", | |
457 | masterspec->np->name); | |
458 | return -EBUSY; | |
459 | } | |
460 | ||
461 | if (masterspec->args_count > MAX_MASTER_STREAMIDS) { | |
462 | dev_err(dev, | |
463 | "reached maximum number (%d) of stream IDs for master device %s\n", | |
464 | MAX_MASTER_STREAMIDS, masterspec->np->name); | |
465 | return -ENOSPC; | |
466 | } | |
467 | ||
468 | master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); | |
469 | if (!master) | |
470 | return -ENOMEM; | |
471 | ||
472 | master->of_node = masterspec->np; | |
473 | master->num_streamids = masterspec->args_count; | |
474 | ||
475 | for (i = 0; i < master->num_streamids; ++i) | |
476 | master->streamids[i] = masterspec->args[i]; | |
477 | ||
478 | return insert_smmu_master(smmu, master); | |
479 | } | |
480 | ||
481 | static struct arm_smmu_device *find_parent_smmu(struct arm_smmu_device *smmu) | |
482 | { | |
483 | struct arm_smmu_device *parent; | |
484 | ||
485 | if (!smmu->parent_of_node) | |
486 | return NULL; | |
487 | ||
488 | spin_lock(&arm_smmu_devices_lock); | |
489 | list_for_each_entry(parent, &arm_smmu_devices, list) | |
490 | if (parent->dev->of_node == smmu->parent_of_node) | |
491 | goto out_unlock; | |
492 | ||
493 | parent = NULL; | |
494 | dev_warn(smmu->dev, | |
495 | "Failed to find SMMU parent despite parent in DT\n"); | |
496 | out_unlock: | |
497 | spin_unlock(&arm_smmu_devices_lock); | |
498 | return parent; | |
499 | } | |
500 | ||
501 | static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end) | |
502 | { | |
503 | int idx; | |
504 | ||
505 | do { | |
506 | idx = find_next_zero_bit(map, end, start); | |
507 | if (idx == end) | |
508 | return -ENOSPC; | |
509 | } while (test_and_set_bit(idx, map)); | |
510 | ||
511 | return idx; | |
512 | } | |
513 | ||
514 | static void __arm_smmu_free_bitmap(unsigned long *map, int idx) | |
515 | { | |
516 | clear_bit(idx, map); | |
517 | } | |
518 | ||
519 | /* Wait for any pending TLB invalidations to complete */ | |
520 | static void arm_smmu_tlb_sync(struct arm_smmu_device *smmu) | |
521 | { | |
522 | int count = 0; | |
523 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
524 | ||
525 | writel_relaxed(0, gr0_base + ARM_SMMU_GR0_sTLBGSYNC); | |
526 | while (readl_relaxed(gr0_base + ARM_SMMU_GR0_sTLBGSTATUS) | |
527 | & sTLBGSTATUS_GSACTIVE) { | |
528 | cpu_relax(); | |
529 | if (++count == TLB_LOOP_TIMEOUT) { | |
530 | dev_err_ratelimited(smmu->dev, | |
531 | "TLB sync timed out -- SMMU may be deadlocked\n"); | |
532 | return; | |
533 | } | |
534 | udelay(1); | |
535 | } | |
536 | } | |
537 | ||
1463fe44 WD |
538 | static void arm_smmu_tlb_inv_context(struct arm_smmu_cfg *cfg) |
539 | { | |
540 | struct arm_smmu_device *smmu = cfg->smmu; | |
541 | void __iomem *base = ARM_SMMU_GR0(smmu); | |
542 | bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS; | |
543 | ||
544 | if (stage1) { | |
545 | base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx); | |
ecfadb6e WD |
546 | writel_relaxed(ARM_SMMU_CB_ASID(cfg), |
547 | base + ARM_SMMU_CB_S1_TLBIASID); | |
1463fe44 WD |
548 | } else { |
549 | base = ARM_SMMU_GR0(smmu); | |
ecfadb6e WD |
550 | writel_relaxed(ARM_SMMU_CB_VMID(cfg), |
551 | base + ARM_SMMU_GR0_TLBIVMID); | |
1463fe44 WD |
552 | } |
553 | ||
554 | arm_smmu_tlb_sync(smmu); | |
555 | } | |
556 | ||
45ae7cff WD |
557 | static irqreturn_t arm_smmu_context_fault(int irq, void *dev) |
558 | { | |
559 | int flags, ret; | |
560 | u32 fsr, far, fsynr, resume; | |
561 | unsigned long iova; | |
562 | struct iommu_domain *domain = dev; | |
563 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
564 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
565 | struct arm_smmu_device *smmu = root_cfg->smmu; | |
566 | void __iomem *cb_base; | |
567 | ||
568 | cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx); | |
569 | fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); | |
570 | ||
571 | if (!(fsr & FSR_FAULT)) | |
572 | return IRQ_NONE; | |
573 | ||
574 | if (fsr & FSR_IGN) | |
575 | dev_err_ratelimited(smmu->dev, | |
576 | "Unexpected context fault (fsr 0x%u)\n", | |
577 | fsr); | |
578 | ||
579 | fsynr = readl_relaxed(cb_base + ARM_SMMU_CB_FSYNR0); | |
580 | flags = fsynr & FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ; | |
581 | ||
582 | far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_LO); | |
583 | iova = far; | |
584 | #ifdef CONFIG_64BIT | |
585 | far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_HI); | |
586 | iova |= ((unsigned long)far << 32); | |
587 | #endif | |
588 | ||
589 | if (!report_iommu_fault(domain, smmu->dev, iova, flags)) { | |
590 | ret = IRQ_HANDLED; | |
591 | resume = RESUME_RETRY; | |
592 | } else { | |
593 | ret = IRQ_NONE; | |
594 | resume = RESUME_TERMINATE; | |
595 | } | |
596 | ||
597 | /* Clear the faulting FSR */ | |
598 | writel(fsr, cb_base + ARM_SMMU_CB_FSR); | |
599 | ||
600 | /* Retry or terminate any stalled transactions */ | |
601 | if (fsr & FSR_SS) | |
602 | writel_relaxed(resume, cb_base + ARM_SMMU_CB_RESUME); | |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
607 | static irqreturn_t arm_smmu_global_fault(int irq, void *dev) | |
608 | { | |
609 | u32 gfsr, gfsynr0, gfsynr1, gfsynr2; | |
610 | struct arm_smmu_device *smmu = dev; | |
611 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
612 | ||
613 | gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR); | |
adaba320 WD |
614 | if (!gfsr) |
615 | return IRQ_NONE; | |
616 | ||
45ae7cff WD |
617 | gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0); |
618 | gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1); | |
619 | gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2); | |
620 | ||
621 | dev_err_ratelimited(smmu->dev, | |
622 | "Unexpected global fault, this could be serious\n"); | |
623 | dev_err_ratelimited(smmu->dev, | |
624 | "\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n", | |
625 | gfsr, gfsynr0, gfsynr1, gfsynr2); | |
626 | ||
627 | writel(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR); | |
adaba320 | 628 | return IRQ_HANDLED; |
45ae7cff WD |
629 | } |
630 | ||
631 | static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain) | |
632 | { | |
633 | u32 reg; | |
634 | bool stage1; | |
635 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
636 | struct arm_smmu_device *smmu = root_cfg->smmu; | |
637 | void __iomem *cb_base, *gr0_base, *gr1_base; | |
638 | ||
639 | gr0_base = ARM_SMMU_GR0(smmu); | |
640 | gr1_base = ARM_SMMU_GR1(smmu); | |
641 | stage1 = root_cfg->cbar != CBAR_TYPE_S2_TRANS; | |
642 | cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx); | |
643 | ||
644 | /* CBAR */ | |
1463fe44 | 645 | reg = root_cfg->cbar; |
45ae7cff WD |
646 | if (smmu->version == 1) |
647 | reg |= root_cfg->irptndx << CBAR_IRPTNDX_SHIFT; | |
648 | ||
649 | /* Use the weakest memory type, so it is overridden by the pte */ | |
650 | if (stage1) | |
651 | reg |= (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT); | |
1463fe44 | 652 | else |
ecfadb6e | 653 | reg |= ARM_SMMU_CB_VMID(root_cfg) << CBAR_VMID_SHIFT; |
45ae7cff WD |
654 | writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(root_cfg->cbndx)); |
655 | ||
656 | if (smmu->version > 1) { | |
657 | /* CBA2R */ | |
658 | #ifdef CONFIG_64BIT | |
659 | reg = CBA2R_RW64_64BIT; | |
660 | #else | |
661 | reg = CBA2R_RW64_32BIT; | |
662 | #endif | |
663 | writel_relaxed(reg, | |
664 | gr1_base + ARM_SMMU_GR1_CBA2R(root_cfg->cbndx)); | |
665 | ||
666 | /* TTBCR2 */ | |
667 | switch (smmu->input_size) { | |
668 | case 32: | |
669 | reg = (TTBCR2_ADDR_32 << TTBCR2_SEP_SHIFT); | |
670 | break; | |
671 | case 36: | |
672 | reg = (TTBCR2_ADDR_36 << TTBCR2_SEP_SHIFT); | |
673 | break; | |
674 | case 39: | |
675 | reg = (TTBCR2_ADDR_40 << TTBCR2_SEP_SHIFT); | |
676 | break; | |
677 | case 42: | |
678 | reg = (TTBCR2_ADDR_42 << TTBCR2_SEP_SHIFT); | |
679 | break; | |
680 | case 44: | |
681 | reg = (TTBCR2_ADDR_44 << TTBCR2_SEP_SHIFT); | |
682 | break; | |
683 | case 48: | |
684 | reg = (TTBCR2_ADDR_48 << TTBCR2_SEP_SHIFT); | |
685 | break; | |
686 | } | |
687 | ||
688 | switch (smmu->s1_output_size) { | |
689 | case 32: | |
690 | reg |= (TTBCR2_ADDR_32 << TTBCR2_PASIZE_SHIFT); | |
691 | break; | |
692 | case 36: | |
693 | reg |= (TTBCR2_ADDR_36 << TTBCR2_PASIZE_SHIFT); | |
694 | break; | |
695 | case 39: | |
696 | reg |= (TTBCR2_ADDR_40 << TTBCR2_PASIZE_SHIFT); | |
697 | break; | |
698 | case 42: | |
699 | reg |= (TTBCR2_ADDR_42 << TTBCR2_PASIZE_SHIFT); | |
700 | break; | |
701 | case 44: | |
702 | reg |= (TTBCR2_ADDR_44 << TTBCR2_PASIZE_SHIFT); | |
703 | break; | |
704 | case 48: | |
705 | reg |= (TTBCR2_ADDR_48 << TTBCR2_PASIZE_SHIFT); | |
706 | break; | |
707 | } | |
708 | ||
709 | if (stage1) | |
710 | writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR2); | |
711 | } | |
712 | ||
713 | /* TTBR0 */ | |
714 | reg = __pa(root_cfg->pgd); | |
45ae7cff WD |
715 | writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO); |
716 | reg = (phys_addr_t)__pa(root_cfg->pgd) >> 32; | |
1463fe44 | 717 | if (stage1) |
ecfadb6e | 718 | reg |= ARM_SMMU_CB_ASID(root_cfg) << TTBRn_HI_ASID_SHIFT; |
45ae7cff | 719 | writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI); |
45ae7cff WD |
720 | |
721 | /* | |
722 | * TTBCR | |
723 | * We use long descriptor, with inner-shareable WBWA tables in TTBR0. | |
724 | */ | |
725 | if (smmu->version > 1) { | |
726 | if (PAGE_SIZE == SZ_4K) | |
727 | reg = TTBCR_TG0_4K; | |
728 | else | |
729 | reg = TTBCR_TG0_64K; | |
730 | ||
731 | if (!stage1) { | |
732 | switch (smmu->s2_output_size) { | |
733 | case 32: | |
734 | reg |= (TTBCR2_ADDR_32 << TTBCR_PASIZE_SHIFT); | |
735 | break; | |
736 | case 36: | |
737 | reg |= (TTBCR2_ADDR_36 << TTBCR_PASIZE_SHIFT); | |
738 | break; | |
739 | case 40: | |
740 | reg |= (TTBCR2_ADDR_40 << TTBCR_PASIZE_SHIFT); | |
741 | break; | |
742 | case 42: | |
743 | reg |= (TTBCR2_ADDR_42 << TTBCR_PASIZE_SHIFT); | |
744 | break; | |
745 | case 44: | |
746 | reg |= (TTBCR2_ADDR_44 << TTBCR_PASIZE_SHIFT); | |
747 | break; | |
748 | case 48: | |
749 | reg |= (TTBCR2_ADDR_48 << TTBCR_PASIZE_SHIFT); | |
750 | break; | |
751 | } | |
752 | } else { | |
753 | reg |= (64 - smmu->s1_output_size) << TTBCR_T0SZ_SHIFT; | |
754 | } | |
755 | } else { | |
756 | reg = 0; | |
757 | } | |
758 | ||
759 | reg |= TTBCR_EAE | | |
760 | (TTBCR_SH_IS << TTBCR_SH0_SHIFT) | | |
761 | (TTBCR_RGN_WBWA << TTBCR_ORGN0_SHIFT) | | |
762 | (TTBCR_RGN_WBWA << TTBCR_IRGN0_SHIFT) | | |
763 | (TTBCR_SL0_LVL_1 << TTBCR_SL0_SHIFT); | |
764 | writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR); | |
765 | ||
766 | /* MAIR0 (stage-1 only) */ | |
767 | if (stage1) { | |
768 | reg = (MAIR_ATTR_NC << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_NC)) | | |
769 | (MAIR_ATTR_WBRWA << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_CACHE)) | | |
770 | (MAIR_ATTR_DEVICE << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_DEV)); | |
771 | writel_relaxed(reg, cb_base + ARM_SMMU_CB_S1_MAIR0); | |
772 | } | |
773 | ||
45ae7cff WD |
774 | /* SCTLR */ |
775 | reg = SCTLR_CFCFG | SCTLR_CFIE | SCTLR_CFRE | SCTLR_M | SCTLR_EAE_SBOP; | |
776 | if (stage1) | |
777 | reg |= SCTLR_S1_ASIDPNE; | |
778 | #ifdef __BIG_ENDIAN | |
779 | reg |= SCTLR_E; | |
780 | #endif | |
781 | writel(reg, cb_base + ARM_SMMU_CB_SCTLR); | |
782 | } | |
783 | ||
784 | static int arm_smmu_init_domain_context(struct iommu_domain *domain, | |
785 | struct device *dev) | |
786 | { | |
787 | int irq, ret, start; | |
788 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
789 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
790 | struct arm_smmu_device *smmu, *parent; | |
791 | ||
792 | /* | |
793 | * Walk the SMMU chain to find the root device for this chain. | |
794 | * We assume that no masters have translations which terminate | |
795 | * early, and therefore check that the root SMMU does indeed have | |
796 | * a StreamID for the master in question. | |
797 | */ | |
798 | parent = dev->archdata.iommu; | |
799 | smmu_domain->output_mask = -1; | |
800 | do { | |
801 | smmu = parent; | |
802 | smmu_domain->output_mask &= (1ULL << smmu->s2_output_size) - 1; | |
803 | } while ((parent = find_parent_smmu(smmu))); | |
804 | ||
805 | if (!find_smmu_master(smmu, dev->of_node)) { | |
806 | dev_err(dev, "unable to find root SMMU for device\n"); | |
807 | return -ENODEV; | |
808 | } | |
809 | ||
45ae7cff WD |
810 | if (smmu->features & ARM_SMMU_FEAT_TRANS_NESTED) { |
811 | /* | |
812 | * We will likely want to change this if/when KVM gets | |
813 | * involved. | |
814 | */ | |
815 | root_cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS; | |
816 | start = smmu->num_s2_context_banks; | |
817 | } else if (smmu->features & ARM_SMMU_FEAT_TRANS_S2) { | |
818 | root_cfg->cbar = CBAR_TYPE_S2_TRANS; | |
819 | start = 0; | |
820 | } else { | |
821 | root_cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS; | |
822 | start = smmu->num_s2_context_banks; | |
823 | } | |
824 | ||
825 | ret = __arm_smmu_alloc_bitmap(smmu->context_map, start, | |
826 | smmu->num_context_banks); | |
827 | if (IS_ERR_VALUE(ret)) | |
ecfadb6e | 828 | return ret; |
45ae7cff WD |
829 | |
830 | root_cfg->cbndx = ret; | |
45ae7cff WD |
831 | if (smmu->version == 1) { |
832 | root_cfg->irptndx = atomic_inc_return(&smmu->irptndx); | |
833 | root_cfg->irptndx %= smmu->num_context_irqs; | |
834 | } else { | |
835 | root_cfg->irptndx = root_cfg->cbndx; | |
836 | } | |
837 | ||
838 | irq = smmu->irqs[smmu->num_global_irqs + root_cfg->irptndx]; | |
839 | ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED, | |
840 | "arm-smmu-context-fault", domain); | |
841 | if (IS_ERR_VALUE(ret)) { | |
842 | dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n", | |
843 | root_cfg->irptndx, irq); | |
faea13b7 | 844 | root_cfg->irptndx = INVALID_IRPTNDX; |
45ae7cff WD |
845 | goto out_free_context; |
846 | } | |
847 | ||
848 | root_cfg->smmu = smmu; | |
849 | arm_smmu_init_context_bank(smmu_domain); | |
850 | return ret; | |
851 | ||
852 | out_free_context: | |
853 | __arm_smmu_free_bitmap(smmu->context_map, root_cfg->cbndx); | |
45ae7cff WD |
854 | return ret; |
855 | } | |
856 | ||
857 | static void arm_smmu_destroy_domain_context(struct iommu_domain *domain) | |
858 | { | |
859 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
860 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
861 | struct arm_smmu_device *smmu = root_cfg->smmu; | |
1463fe44 | 862 | void __iomem *cb_base; |
45ae7cff WD |
863 | int irq; |
864 | ||
865 | if (!smmu) | |
866 | return; | |
867 | ||
1463fe44 WD |
868 | /* Disable the context bank and nuke the TLB before freeing it. */ |
869 | cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx); | |
870 | writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR); | |
871 | arm_smmu_tlb_inv_context(root_cfg); | |
872 | ||
faea13b7 | 873 | if (root_cfg->irptndx != INVALID_IRPTNDX) { |
45ae7cff WD |
874 | irq = smmu->irqs[smmu->num_global_irqs + root_cfg->irptndx]; |
875 | free_irq(irq, domain); | |
876 | } | |
877 | ||
45ae7cff WD |
878 | __arm_smmu_free_bitmap(smmu->context_map, root_cfg->cbndx); |
879 | } | |
880 | ||
881 | static int arm_smmu_domain_init(struct iommu_domain *domain) | |
882 | { | |
883 | struct arm_smmu_domain *smmu_domain; | |
884 | pgd_t *pgd; | |
885 | ||
886 | /* | |
887 | * Allocate the domain and initialise some of its data structures. | |
888 | * We can't really do anything meaningful until we've added a | |
889 | * master. | |
890 | */ | |
891 | smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL); | |
892 | if (!smmu_domain) | |
893 | return -ENOMEM; | |
894 | ||
895 | pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL); | |
896 | if (!pgd) | |
897 | goto out_free_domain; | |
898 | smmu_domain->root_cfg.pgd = pgd; | |
899 | ||
900 | spin_lock_init(&smmu_domain->lock); | |
901 | domain->priv = smmu_domain; | |
902 | return 0; | |
903 | ||
904 | out_free_domain: | |
905 | kfree(smmu_domain); | |
906 | return -ENOMEM; | |
907 | } | |
908 | ||
909 | static void arm_smmu_free_ptes(pmd_t *pmd) | |
910 | { | |
911 | pgtable_t table = pmd_pgtable(*pmd); | |
912 | pgtable_page_dtor(table); | |
913 | __free_page(table); | |
914 | } | |
915 | ||
916 | static void arm_smmu_free_pmds(pud_t *pud) | |
917 | { | |
918 | int i; | |
919 | pmd_t *pmd, *pmd_base = pmd_offset(pud, 0); | |
920 | ||
921 | pmd = pmd_base; | |
922 | for (i = 0; i < PTRS_PER_PMD; ++i) { | |
923 | if (pmd_none(*pmd)) | |
924 | continue; | |
925 | ||
926 | arm_smmu_free_ptes(pmd); | |
927 | pmd++; | |
928 | } | |
929 | ||
930 | pmd_free(NULL, pmd_base); | |
931 | } | |
932 | ||
933 | static void arm_smmu_free_puds(pgd_t *pgd) | |
934 | { | |
935 | int i; | |
936 | pud_t *pud, *pud_base = pud_offset(pgd, 0); | |
937 | ||
938 | pud = pud_base; | |
939 | for (i = 0; i < PTRS_PER_PUD; ++i) { | |
940 | if (pud_none(*pud)) | |
941 | continue; | |
942 | ||
943 | arm_smmu_free_pmds(pud); | |
944 | pud++; | |
945 | } | |
946 | ||
947 | pud_free(NULL, pud_base); | |
948 | } | |
949 | ||
950 | static void arm_smmu_free_pgtables(struct arm_smmu_domain *smmu_domain) | |
951 | { | |
952 | int i; | |
953 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
954 | pgd_t *pgd, *pgd_base = root_cfg->pgd; | |
955 | ||
956 | /* | |
957 | * Recursively free the page tables for this domain. We don't | |
958 | * care about speculative TLB filling, because the TLB will be | |
959 | * nuked next time this context bank is re-allocated and no devices | |
960 | * currently map to these tables. | |
961 | */ | |
962 | pgd = pgd_base; | |
963 | for (i = 0; i < PTRS_PER_PGD; ++i) { | |
964 | if (pgd_none(*pgd)) | |
965 | continue; | |
966 | arm_smmu_free_puds(pgd); | |
967 | pgd++; | |
968 | } | |
969 | ||
970 | kfree(pgd_base); | |
971 | } | |
972 | ||
973 | static void arm_smmu_domain_destroy(struct iommu_domain *domain) | |
974 | { | |
975 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1463fe44 WD |
976 | |
977 | /* | |
978 | * Free the domain resources. We assume that all devices have | |
979 | * already been detached. | |
980 | */ | |
45ae7cff WD |
981 | arm_smmu_destroy_domain_context(domain); |
982 | arm_smmu_free_pgtables(smmu_domain); | |
983 | kfree(smmu_domain); | |
984 | } | |
985 | ||
986 | static int arm_smmu_master_configure_smrs(struct arm_smmu_device *smmu, | |
987 | struct arm_smmu_master *master) | |
988 | { | |
989 | int i; | |
990 | struct arm_smmu_smr *smrs; | |
991 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
992 | ||
993 | if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH)) | |
994 | return 0; | |
995 | ||
996 | if (master->smrs) | |
997 | return -EEXIST; | |
998 | ||
999 | smrs = kmalloc(sizeof(*smrs) * master->num_streamids, GFP_KERNEL); | |
1000 | if (!smrs) { | |
1001 | dev_err(smmu->dev, "failed to allocate %d SMRs for master %s\n", | |
1002 | master->num_streamids, master->of_node->name); | |
1003 | return -ENOMEM; | |
1004 | } | |
1005 | ||
1006 | /* Allocate the SMRs on the root SMMU */ | |
1007 | for (i = 0; i < master->num_streamids; ++i) { | |
1008 | int idx = __arm_smmu_alloc_bitmap(smmu->smr_map, 0, | |
1009 | smmu->num_mapping_groups); | |
1010 | if (IS_ERR_VALUE(idx)) { | |
1011 | dev_err(smmu->dev, "failed to allocate free SMR\n"); | |
1012 | goto err_free_smrs; | |
1013 | } | |
1014 | ||
1015 | smrs[i] = (struct arm_smmu_smr) { | |
1016 | .idx = idx, | |
1017 | .mask = 0, /* We don't currently share SMRs */ | |
1018 | .id = master->streamids[i], | |
1019 | }; | |
1020 | } | |
1021 | ||
1022 | /* It worked! Now, poke the actual hardware */ | |
1023 | for (i = 0; i < master->num_streamids; ++i) { | |
1024 | u32 reg = SMR_VALID | smrs[i].id << SMR_ID_SHIFT | | |
1025 | smrs[i].mask << SMR_MASK_SHIFT; | |
1026 | writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_SMR(smrs[i].idx)); | |
1027 | } | |
1028 | ||
1029 | master->smrs = smrs; | |
1030 | return 0; | |
1031 | ||
1032 | err_free_smrs: | |
1033 | while (--i >= 0) | |
1034 | __arm_smmu_free_bitmap(smmu->smr_map, smrs[i].idx); | |
1035 | kfree(smrs); | |
1036 | return -ENOSPC; | |
1037 | } | |
1038 | ||
1039 | static void arm_smmu_master_free_smrs(struct arm_smmu_device *smmu, | |
1040 | struct arm_smmu_master *master) | |
1041 | { | |
1042 | int i; | |
1043 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
1044 | struct arm_smmu_smr *smrs = master->smrs; | |
1045 | ||
1046 | /* Invalidate the SMRs before freeing back to the allocator */ | |
1047 | for (i = 0; i < master->num_streamids; ++i) { | |
1048 | u8 idx = smrs[i].idx; | |
1049 | writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(idx)); | |
1050 | __arm_smmu_free_bitmap(smmu->smr_map, idx); | |
1051 | } | |
1052 | ||
1053 | master->smrs = NULL; | |
1054 | kfree(smrs); | |
1055 | } | |
1056 | ||
1057 | static void arm_smmu_bypass_stream_mapping(struct arm_smmu_device *smmu, | |
1058 | struct arm_smmu_master *master) | |
1059 | { | |
1060 | int i; | |
1061 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
1062 | ||
1063 | for (i = 0; i < master->num_streamids; ++i) { | |
1064 | u16 sid = master->streamids[i]; | |
1065 | writel_relaxed(S2CR_TYPE_BYPASS, | |
1066 | gr0_base + ARM_SMMU_GR0_S2CR(sid)); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain, | |
1071 | struct arm_smmu_master *master) | |
1072 | { | |
1073 | int i, ret; | |
1074 | struct arm_smmu_device *parent, *smmu = smmu_domain->root_cfg.smmu; | |
1075 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
1076 | ||
1077 | ret = arm_smmu_master_configure_smrs(smmu, master); | |
1078 | if (ret) | |
1079 | return ret; | |
1080 | ||
1081 | /* Bypass the leaves */ | |
1082 | smmu = smmu_domain->leaf_smmu; | |
1083 | while ((parent = find_parent_smmu(smmu))) { | |
1084 | /* | |
1085 | * We won't have a StreamID match for anything but the root | |
1086 | * smmu, so we only need to worry about StreamID indexing, | |
1087 | * where we must install bypass entries in the S2CRs. | |
1088 | */ | |
1089 | if (smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) | |
1090 | continue; | |
1091 | ||
1092 | arm_smmu_bypass_stream_mapping(smmu, master); | |
1093 | smmu = parent; | |
1094 | } | |
1095 | ||
1096 | /* Now we're at the root, time to point at our context bank */ | |
1097 | for (i = 0; i < master->num_streamids; ++i) { | |
1098 | u32 idx, s2cr; | |
1099 | idx = master->smrs ? master->smrs[i].idx : master->streamids[i]; | |
1100 | s2cr = (S2CR_TYPE_TRANS << S2CR_TYPE_SHIFT) | | |
1101 | (smmu_domain->root_cfg.cbndx << S2CR_CBNDX_SHIFT); | |
1102 | writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx)); | |
1103 | } | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain, | |
1109 | struct arm_smmu_master *master) | |
1110 | { | |
1111 | struct arm_smmu_device *smmu = smmu_domain->root_cfg.smmu; | |
1112 | ||
1113 | /* | |
1114 | * We *must* clear the S2CR first, because freeing the SMR means | |
1115 | * that it can be re-allocated immediately. | |
1116 | */ | |
1117 | arm_smmu_bypass_stream_mapping(smmu, master); | |
1118 | arm_smmu_master_free_smrs(smmu, master); | |
1119 | } | |
1120 | ||
1121 | static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) | |
1122 | { | |
1123 | int ret = -EINVAL; | |
1124 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1125 | struct arm_smmu_device *device_smmu = dev->archdata.iommu; | |
1126 | struct arm_smmu_master *master; | |
1127 | ||
1128 | if (!device_smmu) { | |
1129 | dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n"); | |
1130 | return -ENXIO; | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Sanity check the domain. We don't currently support domains | |
1135 | * that cross between different SMMU chains. | |
1136 | */ | |
1137 | spin_lock(&smmu_domain->lock); | |
1138 | if (!smmu_domain->leaf_smmu) { | |
1139 | /* Now that we have a master, we can finalise the domain */ | |
1140 | ret = arm_smmu_init_domain_context(domain, dev); | |
1141 | if (IS_ERR_VALUE(ret)) | |
1142 | goto err_unlock; | |
1143 | ||
1144 | smmu_domain->leaf_smmu = device_smmu; | |
1145 | } else if (smmu_domain->leaf_smmu != device_smmu) { | |
1146 | dev_err(dev, | |
1147 | "cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n", | |
1148 | dev_name(smmu_domain->leaf_smmu->dev), | |
1149 | dev_name(device_smmu->dev)); | |
1150 | goto err_unlock; | |
1151 | } | |
1152 | spin_unlock(&smmu_domain->lock); | |
1153 | ||
1154 | /* Looks ok, so add the device to the domain */ | |
1155 | master = find_smmu_master(smmu_domain->leaf_smmu, dev->of_node); | |
1156 | if (!master) | |
1157 | return -ENODEV; | |
1158 | ||
1159 | return arm_smmu_domain_add_master(smmu_domain, master); | |
1160 | ||
1161 | err_unlock: | |
1162 | spin_unlock(&smmu_domain->lock); | |
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | static void arm_smmu_detach_dev(struct iommu_domain *domain, struct device *dev) | |
1167 | { | |
1168 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1169 | struct arm_smmu_master *master; | |
1170 | ||
1171 | master = find_smmu_master(smmu_domain->leaf_smmu, dev->of_node); | |
1172 | if (master) | |
1173 | arm_smmu_domain_remove_master(smmu_domain, master); | |
1174 | } | |
1175 | ||
1176 | static void arm_smmu_flush_pgtable(struct arm_smmu_device *smmu, void *addr, | |
1177 | size_t size) | |
1178 | { | |
1179 | unsigned long offset = (unsigned long)addr & ~PAGE_MASK; | |
1180 | ||
1181 | /* | |
1182 | * If the SMMU can't walk tables in the CPU caches, treat them | |
1183 | * like non-coherent DMA since we need to flush the new entries | |
1184 | * all the way out to memory. There's no possibility of recursion | |
1185 | * here as the SMMU table walker will not be wired through another | |
1186 | * SMMU. | |
1187 | */ | |
1188 | if (!(smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)) | |
1189 | dma_map_page(smmu->dev, virt_to_page(addr), offset, size, | |
1190 | DMA_TO_DEVICE); | |
1191 | } | |
1192 | ||
1193 | static bool arm_smmu_pte_is_contiguous_range(unsigned long addr, | |
1194 | unsigned long end) | |
1195 | { | |
1196 | return !(addr & ~ARM_SMMU_PTE_CONT_MASK) && | |
1197 | (addr + ARM_SMMU_PTE_CONT_SIZE <= end); | |
1198 | } | |
1199 | ||
1200 | static int arm_smmu_alloc_init_pte(struct arm_smmu_device *smmu, pmd_t *pmd, | |
1201 | unsigned long addr, unsigned long end, | |
1202 | unsigned long pfn, int flags, int stage) | |
1203 | { | |
1204 | pte_t *pte, *start; | |
1205 | pteval_t pteval = ARM_SMMU_PTE_PAGE | ARM_SMMU_PTE_AF; | |
1206 | ||
1207 | if (pmd_none(*pmd)) { | |
1208 | /* Allocate a new set of tables */ | |
1209 | pgtable_t table = alloc_page(PGALLOC_GFP); | |
1210 | if (!table) | |
1211 | return -ENOMEM; | |
1212 | ||
1213 | arm_smmu_flush_pgtable(smmu, page_address(table), | |
1214 | ARM_SMMU_PTE_HWTABLE_SIZE); | |
1215 | pgtable_page_ctor(table); | |
1216 | pmd_populate(NULL, pmd, table); | |
1217 | arm_smmu_flush_pgtable(smmu, pmd, sizeof(*pmd)); | |
1218 | } | |
1219 | ||
1220 | if (stage == 1) { | |
1463fe44 | 1221 | pteval |= ARM_SMMU_PTE_AP_UNPRIV | ARM_SMMU_PTE_nG; |
45ae7cff WD |
1222 | if (!(flags & IOMMU_WRITE) && (flags & IOMMU_READ)) |
1223 | pteval |= ARM_SMMU_PTE_AP_RDONLY; | |
1224 | ||
1225 | if (flags & IOMMU_CACHE) | |
1226 | pteval |= (MAIR_ATTR_IDX_CACHE << | |
1227 | ARM_SMMU_PTE_ATTRINDX_SHIFT); | |
1228 | } else { | |
1229 | pteval |= ARM_SMMU_PTE_HAP_FAULT; | |
1230 | if (flags & IOMMU_READ) | |
1231 | pteval |= ARM_SMMU_PTE_HAP_READ; | |
1232 | if (flags & IOMMU_WRITE) | |
1233 | pteval |= ARM_SMMU_PTE_HAP_WRITE; | |
1234 | if (flags & IOMMU_CACHE) | |
1235 | pteval |= ARM_SMMU_PTE_MEMATTR_OIWB; | |
1236 | else | |
1237 | pteval |= ARM_SMMU_PTE_MEMATTR_NC; | |
1238 | } | |
1239 | ||
1240 | /* If no access, create a faulting entry to avoid TLB fills */ | |
1241 | if (!(flags & (IOMMU_READ | IOMMU_WRITE))) | |
1242 | pteval &= ~ARM_SMMU_PTE_PAGE; | |
1243 | ||
1244 | pteval |= ARM_SMMU_PTE_SH_IS; | |
1245 | start = pmd_page_vaddr(*pmd) + pte_index(addr); | |
1246 | pte = start; | |
1247 | ||
1248 | /* | |
1249 | * Install the page table entries. This is fairly complicated | |
1250 | * since we attempt to make use of the contiguous hint in the | |
1251 | * ptes where possible. The contiguous hint indicates a series | |
1252 | * of ARM_SMMU_PTE_CONT_ENTRIES ptes mapping a physically | |
1253 | * contiguous region with the following constraints: | |
1254 | * | |
1255 | * - The region start is aligned to ARM_SMMU_PTE_CONT_SIZE | |
1256 | * - Each pte in the region has the contiguous hint bit set | |
1257 | * | |
1258 | * This complicates unmapping (also handled by this code, when | |
1259 | * neither IOMMU_READ or IOMMU_WRITE are set) because it is | |
1260 | * possible, yet highly unlikely, that a client may unmap only | |
1261 | * part of a contiguous range. This requires clearing of the | |
1262 | * contiguous hint bits in the range before installing the new | |
1263 | * faulting entries. | |
1264 | * | |
1265 | * Note that re-mapping an address range without first unmapping | |
1266 | * it is not supported, so TLB invalidation is not required here | |
1267 | * and is instead performed at unmap and domain-init time. | |
1268 | */ | |
1269 | do { | |
1270 | int i = 1; | |
1271 | pteval &= ~ARM_SMMU_PTE_CONT; | |
1272 | ||
1273 | if (arm_smmu_pte_is_contiguous_range(addr, end)) { | |
1274 | i = ARM_SMMU_PTE_CONT_ENTRIES; | |
1275 | pteval |= ARM_SMMU_PTE_CONT; | |
1276 | } else if (pte_val(*pte) & | |
1277 | (ARM_SMMU_PTE_CONT | ARM_SMMU_PTE_PAGE)) { | |
1278 | int j; | |
1279 | pte_t *cont_start; | |
1280 | unsigned long idx = pte_index(addr); | |
1281 | ||
1282 | idx &= ~(ARM_SMMU_PTE_CONT_ENTRIES - 1); | |
1283 | cont_start = pmd_page_vaddr(*pmd) + idx; | |
1284 | for (j = 0; j < ARM_SMMU_PTE_CONT_ENTRIES; ++j) | |
1285 | pte_val(*(cont_start + j)) &= ~ARM_SMMU_PTE_CONT; | |
1286 | ||
1287 | arm_smmu_flush_pgtable(smmu, cont_start, | |
1288 | sizeof(*pte) * | |
1289 | ARM_SMMU_PTE_CONT_ENTRIES); | |
1290 | } | |
1291 | ||
1292 | do { | |
1293 | *pte = pfn_pte(pfn, __pgprot(pteval)); | |
1294 | } while (pte++, pfn++, addr += PAGE_SIZE, --i); | |
1295 | } while (addr != end); | |
1296 | ||
1297 | arm_smmu_flush_pgtable(smmu, start, sizeof(*pte) * (pte - start)); | |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | static int arm_smmu_alloc_init_pmd(struct arm_smmu_device *smmu, pud_t *pud, | |
1302 | unsigned long addr, unsigned long end, | |
1303 | phys_addr_t phys, int flags, int stage) | |
1304 | { | |
1305 | int ret; | |
1306 | pmd_t *pmd; | |
1307 | unsigned long next, pfn = __phys_to_pfn(phys); | |
1308 | ||
1309 | #ifndef __PAGETABLE_PMD_FOLDED | |
1310 | if (pud_none(*pud)) { | |
1311 | pmd = pmd_alloc_one(NULL, addr); | |
1312 | if (!pmd) | |
1313 | return -ENOMEM; | |
1314 | } else | |
1315 | #endif | |
1316 | pmd = pmd_offset(pud, addr); | |
1317 | ||
1318 | do { | |
1319 | next = pmd_addr_end(addr, end); | |
1320 | ret = arm_smmu_alloc_init_pte(smmu, pmd, addr, end, pfn, | |
1321 | flags, stage); | |
1322 | pud_populate(NULL, pud, pmd); | |
1323 | arm_smmu_flush_pgtable(smmu, pud, sizeof(*pud)); | |
1324 | phys += next - addr; | |
1325 | } while (pmd++, addr = next, addr < end); | |
1326 | ||
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | static int arm_smmu_alloc_init_pud(struct arm_smmu_device *smmu, pgd_t *pgd, | |
1331 | unsigned long addr, unsigned long end, | |
1332 | phys_addr_t phys, int flags, int stage) | |
1333 | { | |
1334 | int ret = 0; | |
1335 | pud_t *pud; | |
1336 | unsigned long next; | |
1337 | ||
1338 | #ifndef __PAGETABLE_PUD_FOLDED | |
1339 | if (pgd_none(*pgd)) { | |
1340 | pud = pud_alloc_one(NULL, addr); | |
1341 | if (!pud) | |
1342 | return -ENOMEM; | |
1343 | } else | |
1344 | #endif | |
1345 | pud = pud_offset(pgd, addr); | |
1346 | ||
1347 | do { | |
1348 | next = pud_addr_end(addr, end); | |
1349 | ret = arm_smmu_alloc_init_pmd(smmu, pud, addr, next, phys, | |
1350 | flags, stage); | |
1351 | pgd_populate(NULL, pud, pgd); | |
1352 | arm_smmu_flush_pgtable(smmu, pgd, sizeof(*pgd)); | |
1353 | phys += next - addr; | |
1354 | } while (pud++, addr = next, addr < end); | |
1355 | ||
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | static int arm_smmu_handle_mapping(struct arm_smmu_domain *smmu_domain, | |
1360 | unsigned long iova, phys_addr_t paddr, | |
1361 | size_t size, int flags) | |
1362 | { | |
1363 | int ret, stage; | |
1364 | unsigned long end; | |
1365 | phys_addr_t input_mask, output_mask; | |
1366 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
1367 | pgd_t *pgd = root_cfg->pgd; | |
1368 | struct arm_smmu_device *smmu = root_cfg->smmu; | |
1369 | ||
1370 | if (root_cfg->cbar == CBAR_TYPE_S2_TRANS) { | |
1371 | stage = 2; | |
1372 | output_mask = (1ULL << smmu->s2_output_size) - 1; | |
1373 | } else { | |
1374 | stage = 1; | |
1375 | output_mask = (1ULL << smmu->s1_output_size) - 1; | |
1376 | } | |
1377 | ||
1378 | if (!pgd) | |
1379 | return -EINVAL; | |
1380 | ||
1381 | if (size & ~PAGE_MASK) | |
1382 | return -EINVAL; | |
1383 | ||
1384 | input_mask = (1ULL << smmu->input_size) - 1; | |
1385 | if ((phys_addr_t)iova & ~input_mask) | |
1386 | return -ERANGE; | |
1387 | ||
1388 | if (paddr & ~output_mask) | |
1389 | return -ERANGE; | |
1390 | ||
1391 | spin_lock(&smmu_domain->lock); | |
1392 | pgd += pgd_index(iova); | |
1393 | end = iova + size; | |
1394 | do { | |
1395 | unsigned long next = pgd_addr_end(iova, end); | |
1396 | ||
1397 | ret = arm_smmu_alloc_init_pud(smmu, pgd, iova, next, paddr, | |
1398 | flags, stage); | |
1399 | if (ret) | |
1400 | goto out_unlock; | |
1401 | ||
1402 | paddr += next - iova; | |
1403 | iova = next; | |
1404 | } while (pgd++, iova != end); | |
1405 | ||
1406 | out_unlock: | |
1407 | spin_unlock(&smmu_domain->lock); | |
1408 | ||
1409 | /* Ensure new page tables are visible to the hardware walker */ | |
1410 | if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK) | |
1411 | dsb(); | |
1412 | ||
1413 | return ret; | |
1414 | } | |
1415 | ||
1416 | static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova, | |
1417 | phys_addr_t paddr, size_t size, int flags) | |
1418 | { | |
1419 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1420 | struct arm_smmu_device *smmu = smmu_domain->leaf_smmu; | |
1421 | ||
1422 | if (!smmu_domain || !smmu) | |
1423 | return -ENODEV; | |
1424 | ||
1425 | /* Check for silent address truncation up the SMMU chain. */ | |
1426 | if ((phys_addr_t)iova & ~smmu_domain->output_mask) | |
1427 | return -ERANGE; | |
1428 | ||
1429 | return arm_smmu_handle_mapping(smmu_domain, iova, paddr, size, flags); | |
1430 | } | |
1431 | ||
1432 | static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova, | |
1433 | size_t size) | |
1434 | { | |
1435 | int ret; | |
1436 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
45ae7cff WD |
1437 | |
1438 | ret = arm_smmu_handle_mapping(smmu_domain, iova, 0, size, 0); | |
1463fe44 | 1439 | arm_smmu_tlb_inv_context(&smmu_domain->root_cfg); |
45ae7cff WD |
1440 | return ret ? ret : size; |
1441 | } | |
1442 | ||
1443 | static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain, | |
1444 | dma_addr_t iova) | |
1445 | { | |
1446 | pgd_t *pgd; | |
1447 | pud_t *pud; | |
1448 | pmd_t *pmd; | |
1449 | pte_t *pte; | |
1450 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1451 | struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg; | |
1452 | struct arm_smmu_device *smmu = root_cfg->smmu; | |
1453 | ||
1454 | spin_lock(&smmu_domain->lock); | |
1455 | pgd = root_cfg->pgd; | |
1456 | if (!pgd) | |
1457 | goto err_unlock; | |
1458 | ||
1459 | pgd += pgd_index(iova); | |
1460 | if (pgd_none_or_clear_bad(pgd)) | |
1461 | goto err_unlock; | |
1462 | ||
1463 | pud = pud_offset(pgd, iova); | |
1464 | if (pud_none_or_clear_bad(pud)) | |
1465 | goto err_unlock; | |
1466 | ||
1467 | pmd = pmd_offset(pud, iova); | |
1468 | if (pmd_none_or_clear_bad(pmd)) | |
1469 | goto err_unlock; | |
1470 | ||
1471 | pte = pmd_page_vaddr(*pmd) + pte_index(iova); | |
1472 | if (pte_none(pte)) | |
1473 | goto err_unlock; | |
1474 | ||
1475 | spin_unlock(&smmu_domain->lock); | |
1476 | return __pfn_to_phys(pte_pfn(*pte)) | (iova & ~PAGE_MASK); | |
1477 | ||
1478 | err_unlock: | |
1479 | spin_unlock(&smmu_domain->lock); | |
1480 | dev_warn(smmu->dev, | |
1481 | "invalid (corrupt?) page tables detected for iova 0x%llx\n", | |
1482 | (unsigned long long)iova); | |
1483 | return -EINVAL; | |
1484 | } | |
1485 | ||
1486 | static int arm_smmu_domain_has_cap(struct iommu_domain *domain, | |
1487 | unsigned long cap) | |
1488 | { | |
1489 | unsigned long caps = 0; | |
1490 | struct arm_smmu_domain *smmu_domain = domain->priv; | |
1491 | ||
1492 | if (smmu_domain->root_cfg.smmu->features & ARM_SMMU_FEAT_COHERENT_WALK) | |
1493 | caps |= IOMMU_CAP_CACHE_COHERENCY; | |
1494 | ||
1495 | return !!(cap & caps); | |
1496 | } | |
1497 | ||
1498 | static int arm_smmu_add_device(struct device *dev) | |
1499 | { | |
1500 | struct arm_smmu_device *child, *parent, *smmu; | |
1501 | struct arm_smmu_master *master = NULL; | |
1502 | ||
1503 | spin_lock(&arm_smmu_devices_lock); | |
1504 | list_for_each_entry(parent, &arm_smmu_devices, list) { | |
1505 | smmu = parent; | |
1506 | ||
1507 | /* Try to find a child of the current SMMU. */ | |
1508 | list_for_each_entry(child, &arm_smmu_devices, list) { | |
1509 | if (child->parent_of_node == parent->dev->of_node) { | |
1510 | /* Does the child sit above our master? */ | |
1511 | master = find_smmu_master(child, dev->of_node); | |
1512 | if (master) { | |
1513 | smmu = NULL; | |
1514 | break; | |
1515 | } | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | /* We found some children, so keep searching. */ | |
1520 | if (!smmu) { | |
1521 | master = NULL; | |
1522 | continue; | |
1523 | } | |
1524 | ||
1525 | master = find_smmu_master(smmu, dev->of_node); | |
1526 | if (master) | |
1527 | break; | |
1528 | } | |
1529 | spin_unlock(&arm_smmu_devices_lock); | |
1530 | ||
1531 | if (!master) | |
1532 | return -ENODEV; | |
1533 | ||
1534 | dev->archdata.iommu = smmu; | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | static void arm_smmu_remove_device(struct device *dev) | |
1539 | { | |
1540 | dev->archdata.iommu = NULL; | |
1541 | } | |
1542 | ||
1543 | static struct iommu_ops arm_smmu_ops = { | |
1544 | .domain_init = arm_smmu_domain_init, | |
1545 | .domain_destroy = arm_smmu_domain_destroy, | |
1546 | .attach_dev = arm_smmu_attach_dev, | |
1547 | .detach_dev = arm_smmu_detach_dev, | |
1548 | .map = arm_smmu_map, | |
1549 | .unmap = arm_smmu_unmap, | |
1550 | .iova_to_phys = arm_smmu_iova_to_phys, | |
1551 | .domain_has_cap = arm_smmu_domain_has_cap, | |
1552 | .add_device = arm_smmu_add_device, | |
1553 | .remove_device = arm_smmu_remove_device, | |
1554 | .pgsize_bitmap = (SECTION_SIZE | | |
1555 | ARM_SMMU_PTE_CONT_SIZE | | |
1556 | PAGE_SIZE), | |
1557 | }; | |
1558 | ||
1559 | static void arm_smmu_device_reset(struct arm_smmu_device *smmu) | |
1560 | { | |
1561 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
1463fe44 | 1562 | void __iomem *sctlr_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB_SCTLR; |
45ae7cff WD |
1563 | int i = 0; |
1564 | u32 scr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sCR0); | |
1565 | ||
1566 | /* Mark all SMRn as invalid and all S2CRn as bypass */ | |
1567 | for (i = 0; i < smmu->num_mapping_groups; ++i) { | |
1568 | writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(i)); | |
1569 | writel_relaxed(S2CR_TYPE_BYPASS, gr0_base + ARM_SMMU_GR0_S2CR(i)); | |
1570 | } | |
1571 | ||
1463fe44 WD |
1572 | /* Make sure all context banks are disabled */ |
1573 | for (i = 0; i < smmu->num_context_banks; ++i) | |
1574 | writel_relaxed(0, sctlr_base + ARM_SMMU_CB(smmu, i)); | |
1575 | ||
45ae7cff WD |
1576 | /* Invalidate the TLB, just in case */ |
1577 | writel_relaxed(0, gr0_base + ARM_SMMU_GR0_STLBIALL); | |
1578 | writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH); | |
1579 | writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH); | |
1580 | ||
1581 | /* Enable fault reporting */ | |
1582 | scr0 |= (sCR0_GFRE | sCR0_GFIE | sCR0_GCFGFRE | sCR0_GCFGFIE); | |
1583 | ||
1584 | /* Disable TLB broadcasting. */ | |
1585 | scr0 |= (sCR0_VMIDPNE | sCR0_PTM); | |
1586 | ||
1587 | /* Enable client access, but bypass when no mapping is found */ | |
1588 | scr0 &= ~(sCR0_CLIENTPD | sCR0_USFCFG); | |
1589 | ||
1590 | /* Disable forced broadcasting */ | |
1591 | scr0 &= ~sCR0_FB; | |
1592 | ||
1593 | /* Don't upgrade barriers */ | |
1594 | scr0 &= ~(sCR0_BSU_MASK << sCR0_BSU_SHIFT); | |
1595 | ||
1596 | /* Push the button */ | |
1597 | arm_smmu_tlb_sync(smmu); | |
1598 | writel(scr0, gr0_base + ARM_SMMU_GR0_sCR0); | |
1599 | } | |
1600 | ||
1601 | static int arm_smmu_id_size_to_bits(int size) | |
1602 | { | |
1603 | switch (size) { | |
1604 | case 0: | |
1605 | return 32; | |
1606 | case 1: | |
1607 | return 36; | |
1608 | case 2: | |
1609 | return 40; | |
1610 | case 3: | |
1611 | return 42; | |
1612 | case 4: | |
1613 | return 44; | |
1614 | case 5: | |
1615 | default: | |
1616 | return 48; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu) | |
1621 | { | |
1622 | unsigned long size; | |
1623 | void __iomem *gr0_base = ARM_SMMU_GR0(smmu); | |
1624 | u32 id; | |
1625 | ||
1626 | dev_notice(smmu->dev, "probing hardware configuration...\n"); | |
1627 | ||
1628 | /* Primecell ID */ | |
1629 | id = readl_relaxed(gr0_base + ARM_SMMU_GR0_PIDR2); | |
1630 | smmu->version = ((id >> PIDR2_ARCH_SHIFT) & PIDR2_ARCH_MASK) + 1; | |
1631 | dev_notice(smmu->dev, "SMMUv%d with:\n", smmu->version); | |
1632 | ||
1633 | /* ID0 */ | |
1634 | id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID0); | |
1635 | #ifndef CONFIG_64BIT | |
1636 | if (((id >> ID0_PTFS_SHIFT) & ID0_PTFS_MASK) == ID0_PTFS_V8_ONLY) { | |
1637 | dev_err(smmu->dev, "\tno v7 descriptor support!\n"); | |
1638 | return -ENODEV; | |
1639 | } | |
1640 | #endif | |
1641 | if (id & ID0_S1TS) { | |
1642 | smmu->features |= ARM_SMMU_FEAT_TRANS_S1; | |
1643 | dev_notice(smmu->dev, "\tstage 1 translation\n"); | |
1644 | } | |
1645 | ||
1646 | if (id & ID0_S2TS) { | |
1647 | smmu->features |= ARM_SMMU_FEAT_TRANS_S2; | |
1648 | dev_notice(smmu->dev, "\tstage 2 translation\n"); | |
1649 | } | |
1650 | ||
1651 | if (id & ID0_NTS) { | |
1652 | smmu->features |= ARM_SMMU_FEAT_TRANS_NESTED; | |
1653 | dev_notice(smmu->dev, "\tnested translation\n"); | |
1654 | } | |
1655 | ||
1656 | if (!(smmu->features & | |
1657 | (ARM_SMMU_FEAT_TRANS_S1 | ARM_SMMU_FEAT_TRANS_S2 | | |
1658 | ARM_SMMU_FEAT_TRANS_NESTED))) { | |
1659 | dev_err(smmu->dev, "\tno translation support!\n"); | |
1660 | return -ENODEV; | |
1661 | } | |
1662 | ||
1663 | if (id & ID0_CTTW) { | |
1664 | smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK; | |
1665 | dev_notice(smmu->dev, "\tcoherent table walk\n"); | |
1666 | } | |
1667 | ||
1668 | if (id & ID0_SMS) { | |
1669 | u32 smr, sid, mask; | |
1670 | ||
1671 | smmu->features |= ARM_SMMU_FEAT_STREAM_MATCH; | |
1672 | smmu->num_mapping_groups = (id >> ID0_NUMSMRG_SHIFT) & | |
1673 | ID0_NUMSMRG_MASK; | |
1674 | if (smmu->num_mapping_groups == 0) { | |
1675 | dev_err(smmu->dev, | |
1676 | "stream-matching supported, but no SMRs present!\n"); | |
1677 | return -ENODEV; | |
1678 | } | |
1679 | ||
1680 | smr = SMR_MASK_MASK << SMR_MASK_SHIFT; | |
1681 | smr |= (SMR_ID_MASK << SMR_ID_SHIFT); | |
1682 | writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0)); | |
1683 | smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0)); | |
1684 | ||
1685 | mask = (smr >> SMR_MASK_SHIFT) & SMR_MASK_MASK; | |
1686 | sid = (smr >> SMR_ID_SHIFT) & SMR_ID_MASK; | |
1687 | if ((mask & sid) != sid) { | |
1688 | dev_err(smmu->dev, | |
1689 | "SMR mask bits (0x%x) insufficient for ID field (0x%x)\n", | |
1690 | mask, sid); | |
1691 | return -ENODEV; | |
1692 | } | |
1693 | ||
1694 | dev_notice(smmu->dev, | |
1695 | "\tstream matching with %u register groups, mask 0x%x", | |
1696 | smmu->num_mapping_groups, mask); | |
1697 | } | |
1698 | ||
1699 | /* ID1 */ | |
1700 | id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID1); | |
1701 | smmu->pagesize = (id & ID1_PAGESIZE) ? SZ_64K : SZ_4K; | |
1702 | ||
1703 | /* Check that we ioremapped enough */ | |
1704 | size = 1 << (((id >> ID1_NUMPAGENDXB_SHIFT) & ID1_NUMPAGENDXB_MASK) + 1); | |
1705 | size *= (smmu->pagesize << 1); | |
1706 | if (smmu->size < size) | |
1707 | dev_warn(smmu->dev, | |
1708 | "device is 0x%lx bytes but only mapped 0x%lx!\n", | |
1709 | size, smmu->size); | |
1710 | ||
1711 | smmu->num_s2_context_banks = (id >> ID1_NUMS2CB_SHIFT) & | |
1712 | ID1_NUMS2CB_MASK; | |
1713 | smmu->num_context_banks = (id >> ID1_NUMCB_SHIFT) & ID1_NUMCB_MASK; | |
1714 | if (smmu->num_s2_context_banks > smmu->num_context_banks) { | |
1715 | dev_err(smmu->dev, "impossible number of S2 context banks!\n"); | |
1716 | return -ENODEV; | |
1717 | } | |
1718 | dev_notice(smmu->dev, "\t%u context banks (%u stage-2 only)\n", | |
1719 | smmu->num_context_banks, smmu->num_s2_context_banks); | |
1720 | ||
1721 | /* ID2 */ | |
1722 | id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID2); | |
1723 | size = arm_smmu_id_size_to_bits((id >> ID2_IAS_SHIFT) & ID2_IAS_MASK); | |
1724 | ||
1725 | /* | |
1726 | * Stage-1 output limited by stage-2 input size due to pgd | |
1727 | * allocation (PTRS_PER_PGD). | |
1728 | */ | |
1729 | #ifdef CONFIG_64BIT | |
1730 | /* Current maximum output size of 39 bits */ | |
1731 | smmu->s1_output_size = min(39UL, size); | |
1732 | #else | |
1733 | smmu->s1_output_size = min(32UL, size); | |
1734 | #endif | |
1735 | ||
1736 | /* The stage-2 output mask is also applied for bypass */ | |
1737 | size = arm_smmu_id_size_to_bits((id >> ID2_OAS_SHIFT) & ID2_OAS_MASK); | |
1738 | smmu->s2_output_size = min((unsigned long)PHYS_MASK_SHIFT, size); | |
1739 | ||
1740 | if (smmu->version == 1) { | |
1741 | smmu->input_size = 32; | |
1742 | } else { | |
1743 | #ifdef CONFIG_64BIT | |
1744 | size = (id >> ID2_UBS_SHIFT) & ID2_UBS_MASK; | |
1745 | size = min(39, arm_smmu_id_size_to_bits(size)); | |
1746 | #else | |
1747 | size = 32; | |
1748 | #endif | |
1749 | smmu->input_size = size; | |
1750 | ||
1751 | if ((PAGE_SIZE == SZ_4K && !(id & ID2_PTFS_4K)) || | |
1752 | (PAGE_SIZE == SZ_64K && !(id & ID2_PTFS_64K)) || | |
1753 | (PAGE_SIZE != SZ_4K && PAGE_SIZE != SZ_64K)) { | |
1754 | dev_err(smmu->dev, "CPU page size 0x%lx unsupported\n", | |
1755 | PAGE_SIZE); | |
1756 | return -ENODEV; | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | dev_notice(smmu->dev, | |
1761 | "\t%lu-bit VA, %lu-bit IPA, %lu-bit PA\n", | |
1762 | smmu->input_size, smmu->s1_output_size, smmu->s2_output_size); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | static int arm_smmu_device_dt_probe(struct platform_device *pdev) | |
1767 | { | |
1768 | struct resource *res; | |
1769 | struct arm_smmu_device *smmu; | |
1770 | struct device_node *dev_node; | |
1771 | struct device *dev = &pdev->dev; | |
1772 | struct rb_node *node; | |
1773 | struct of_phandle_args masterspec; | |
1774 | int num_irqs, i, err; | |
1775 | ||
1776 | smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL); | |
1777 | if (!smmu) { | |
1778 | dev_err(dev, "failed to allocate arm_smmu_device\n"); | |
1779 | return -ENOMEM; | |
1780 | } | |
1781 | smmu->dev = dev; | |
1782 | ||
1783 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1784 | if (!res) { | |
1785 | dev_err(dev, "missing base address/size\n"); | |
1786 | return -ENODEV; | |
1787 | } | |
1788 | ||
1789 | smmu->size = resource_size(res); | |
1790 | smmu->base = devm_request_and_ioremap(dev, res); | |
1791 | if (!smmu->base) | |
1792 | return -EADDRNOTAVAIL; | |
1793 | ||
1794 | if (of_property_read_u32(dev->of_node, "#global-interrupts", | |
1795 | &smmu->num_global_irqs)) { | |
1796 | dev_err(dev, "missing #global-interrupts property\n"); | |
1797 | return -ENODEV; | |
1798 | } | |
1799 | ||
1800 | num_irqs = 0; | |
1801 | while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) { | |
1802 | num_irqs++; | |
1803 | if (num_irqs > smmu->num_global_irqs) | |
1804 | smmu->num_context_irqs++; | |
1805 | } | |
1806 | ||
1807 | if (num_irqs < smmu->num_global_irqs) { | |
1808 | dev_warn(dev, "found %d interrupts but expected at least %d\n", | |
1809 | num_irqs, smmu->num_global_irqs); | |
1810 | smmu->num_global_irqs = num_irqs; | |
1811 | } | |
1812 | smmu->num_context_irqs = num_irqs - smmu->num_global_irqs; | |
1813 | ||
1814 | smmu->irqs = devm_kzalloc(dev, sizeof(*smmu->irqs) * num_irqs, | |
1815 | GFP_KERNEL); | |
1816 | if (!smmu->irqs) { | |
1817 | dev_err(dev, "failed to allocate %d irqs\n", num_irqs); | |
1818 | return -ENOMEM; | |
1819 | } | |
1820 | ||
1821 | for (i = 0; i < num_irqs; ++i) { | |
1822 | int irq = platform_get_irq(pdev, i); | |
1823 | if (irq < 0) { | |
1824 | dev_err(dev, "failed to get irq index %d\n", i); | |
1825 | return -ENODEV; | |
1826 | } | |
1827 | smmu->irqs[i] = irq; | |
1828 | } | |
1829 | ||
1830 | i = 0; | |
1831 | smmu->masters = RB_ROOT; | |
1832 | while (!of_parse_phandle_with_args(dev->of_node, "mmu-masters", | |
1833 | "#stream-id-cells", i, | |
1834 | &masterspec)) { | |
1835 | err = register_smmu_master(smmu, dev, &masterspec); | |
1836 | if (err) { | |
1837 | dev_err(dev, "failed to add master %s\n", | |
1838 | masterspec.np->name); | |
1839 | goto out_put_masters; | |
1840 | } | |
1841 | ||
1842 | i++; | |
1843 | } | |
1844 | dev_notice(dev, "registered %d master devices\n", i); | |
1845 | ||
1846 | if ((dev_node = of_parse_phandle(dev->of_node, "smmu-parent", 0))) | |
1847 | smmu->parent_of_node = dev_node; | |
1848 | ||
1849 | err = arm_smmu_device_cfg_probe(smmu); | |
1850 | if (err) | |
1851 | goto out_put_parent; | |
1852 | ||
1853 | if (smmu->version > 1 && | |
1854 | smmu->num_context_banks != smmu->num_context_irqs) { | |
1855 | dev_err(dev, | |
1856 | "found only %d context interrupt(s) but %d required\n", | |
1857 | smmu->num_context_irqs, smmu->num_context_banks); | |
1858 | goto out_put_parent; | |
1859 | } | |
1860 | ||
45ae7cff WD |
1861 | for (i = 0; i < smmu->num_global_irqs; ++i) { |
1862 | err = request_irq(smmu->irqs[i], | |
1863 | arm_smmu_global_fault, | |
1864 | IRQF_SHARED, | |
1865 | "arm-smmu global fault", | |
1866 | smmu); | |
1867 | if (err) { | |
1868 | dev_err(dev, "failed to request global IRQ %d (%u)\n", | |
1869 | i, smmu->irqs[i]); | |
1870 | goto out_free_irqs; | |
1871 | } | |
1872 | } | |
1873 | ||
1874 | INIT_LIST_HEAD(&smmu->list); | |
1875 | spin_lock(&arm_smmu_devices_lock); | |
1876 | list_add(&smmu->list, &arm_smmu_devices); | |
1877 | spin_unlock(&arm_smmu_devices_lock); | |
fd90cecb WD |
1878 | |
1879 | arm_smmu_device_reset(smmu); | |
45ae7cff WD |
1880 | return 0; |
1881 | ||
1882 | out_free_irqs: | |
1883 | while (i--) | |
1884 | free_irq(smmu->irqs[i], smmu); | |
1885 | ||
1886 | out_put_parent: | |
1887 | if (smmu->parent_of_node) | |
1888 | of_node_put(smmu->parent_of_node); | |
1889 | ||
1890 | out_put_masters: | |
1891 | for (node = rb_first(&smmu->masters); node; node = rb_next(node)) { | |
1892 | struct arm_smmu_master *master; | |
1893 | master = container_of(node, struct arm_smmu_master, node); | |
1894 | of_node_put(master->of_node); | |
1895 | } | |
1896 | ||
1897 | return err; | |
1898 | } | |
1899 | ||
1900 | static int arm_smmu_device_remove(struct platform_device *pdev) | |
1901 | { | |
1902 | int i; | |
1903 | struct device *dev = &pdev->dev; | |
1904 | struct arm_smmu_device *curr, *smmu = NULL; | |
1905 | struct rb_node *node; | |
1906 | ||
1907 | spin_lock(&arm_smmu_devices_lock); | |
1908 | list_for_each_entry(curr, &arm_smmu_devices, list) { | |
1909 | if (curr->dev == dev) { | |
1910 | smmu = curr; | |
1911 | list_del(&smmu->list); | |
1912 | break; | |
1913 | } | |
1914 | } | |
1915 | spin_unlock(&arm_smmu_devices_lock); | |
1916 | ||
1917 | if (!smmu) | |
1918 | return -ENODEV; | |
1919 | ||
1920 | if (smmu->parent_of_node) | |
1921 | of_node_put(smmu->parent_of_node); | |
1922 | ||
1923 | for (node = rb_first(&smmu->masters); node; node = rb_next(node)) { | |
1924 | struct arm_smmu_master *master; | |
1925 | master = container_of(node, struct arm_smmu_master, node); | |
1926 | of_node_put(master->of_node); | |
1927 | } | |
1928 | ||
ecfadb6e | 1929 | if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS)) |
45ae7cff WD |
1930 | dev_err(dev, "removing device with active domains!\n"); |
1931 | ||
1932 | for (i = 0; i < smmu->num_global_irqs; ++i) | |
1933 | free_irq(smmu->irqs[i], smmu); | |
1934 | ||
1935 | /* Turn the thing off */ | |
1936 | writel(sCR0_CLIENTPD, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_sCR0); | |
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | #ifdef CONFIG_OF | |
1941 | static struct of_device_id arm_smmu_of_match[] = { | |
1942 | { .compatible = "arm,smmu-v1", }, | |
1943 | { .compatible = "arm,smmu-v2", }, | |
1944 | { .compatible = "arm,mmu-400", }, | |
1945 | { .compatible = "arm,mmu-500", }, | |
1946 | { }, | |
1947 | }; | |
1948 | MODULE_DEVICE_TABLE(of, arm_smmu_of_match); | |
1949 | #endif | |
1950 | ||
1951 | static struct platform_driver arm_smmu_driver = { | |
1952 | .driver = { | |
1953 | .owner = THIS_MODULE, | |
1954 | .name = "arm-smmu", | |
1955 | .of_match_table = of_match_ptr(arm_smmu_of_match), | |
1956 | }, | |
1957 | .probe = arm_smmu_device_dt_probe, | |
1958 | .remove = arm_smmu_device_remove, | |
1959 | }; | |
1960 | ||
1961 | static int __init arm_smmu_init(void) | |
1962 | { | |
1963 | int ret; | |
1964 | ||
1965 | ret = platform_driver_register(&arm_smmu_driver); | |
1966 | if (ret) | |
1967 | return ret; | |
1968 | ||
1969 | /* Oh, for a proper bus abstraction */ | |
6614ee77 | 1970 | if (!iommu_present(&platform_bus_type)) |
45ae7cff WD |
1971 | bus_set_iommu(&platform_bus_type, &arm_smmu_ops); |
1972 | ||
6614ee77 | 1973 | if (!iommu_present(&amba_bustype)) |
45ae7cff WD |
1974 | bus_set_iommu(&amba_bustype, &arm_smmu_ops); |
1975 | ||
1976 | return 0; | |
1977 | } | |
1978 | ||
1979 | static void __exit arm_smmu_exit(void) | |
1980 | { | |
1981 | return platform_driver_unregister(&arm_smmu_driver); | |
1982 | } | |
1983 | ||
1984 | module_init(arm_smmu_init); | |
1985 | module_exit(arm_smmu_exit); | |
1986 | ||
1987 | MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations"); | |
1988 | MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>"); | |
1989 | MODULE_LICENSE("GPL v2"); |