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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation |
3 | * | |
4 | * Rewrite, cleanup, new allocation schemes, virtual merging: | |
5 | * Copyright (C) 2004 Olof Johansson, IBM Corporation | |
6 | * and Ben. Herrenschmidt, IBM Corporation | |
7 | * | |
8 | * Dynamic DMA mapping support, bus-independent parts. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | ||
1da177e4 LT |
26 | #include <linux/init.h> |
27 | #include <linux/types.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/dma-mapping.h> | |
a66022c4 | 33 | #include <linux/bitmap.h> |
fb3475e9 | 34 | #include <linux/iommu-helper.h> |
62a8bd6c | 35 | #include <linux/crash_dump.h> |
b4c3a872 | 36 | #include <linux/hash.h> |
d6b9a81b AB |
37 | #include <linux/fault-inject.h> |
38 | #include <linux/pci.h> | |
4e13c1ac AK |
39 | #include <linux/iommu.h> |
40 | #include <linux/sched.h> | |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <asm/prom.h> | |
43 | #include <asm/iommu.h> | |
44 | #include <asm/pci-bridge.h> | |
45 | #include <asm/machdep.h> | |
5f50867b | 46 | #include <asm/kdump.h> |
3ccc00a7 | 47 | #include <asm/fadump.h> |
d6b9a81b | 48 | #include <asm/vio.h> |
4e13c1ac | 49 | #include <asm/tce.h> |
c10c21ef | 50 | #include <asm/mmu_context.h> |
1da177e4 LT |
51 | |
52 | #define DBG(...) | |
53 | ||
191aee58 | 54 | static int novmerge; |
56997559 | 55 | |
6490c490 RJ |
56 | static void __iommu_free(struct iommu_table *, dma_addr_t, unsigned int); |
57 | ||
1da177e4 LT |
58 | static int __init setup_iommu(char *str) |
59 | { | |
60 | if (!strcmp(str, "novmerge")) | |
61 | novmerge = 1; | |
62 | else if (!strcmp(str, "vmerge")) | |
63 | novmerge = 0; | |
64 | return 1; | |
65 | } | |
66 | ||
67 | __setup("iommu=", setup_iommu); | |
68 | ||
b4c3a872 AB |
69 | static DEFINE_PER_CPU(unsigned int, iommu_pool_hash); |
70 | ||
71 | /* | |
72 | * We precalculate the hash to avoid doing it on every allocation. | |
73 | * | |
74 | * The hash is important to spread CPUs across all the pools. For example, | |
75 | * on a POWER7 with 4 way SMT we want interrupts on the primary threads and | |
76 | * with 4 pools all primary threads would map to the same pool. | |
77 | */ | |
78 | static int __init setup_iommu_pool_hash(void) | |
79 | { | |
80 | unsigned int i; | |
81 | ||
82 | for_each_possible_cpu(i) | |
83 | per_cpu(iommu_pool_hash, i) = hash_32(i, IOMMU_POOL_HASHBITS); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | subsys_initcall(setup_iommu_pool_hash); | |
88 | ||
d6b9a81b AB |
89 | #ifdef CONFIG_FAIL_IOMMU |
90 | ||
91 | static DECLARE_FAULT_ATTR(fail_iommu); | |
92 | ||
93 | static int __init setup_fail_iommu(char *str) | |
94 | { | |
95 | return setup_fault_attr(&fail_iommu, str); | |
96 | } | |
97 | __setup("fail_iommu=", setup_fail_iommu); | |
98 | ||
99 | static bool should_fail_iommu(struct device *dev) | |
100 | { | |
101 | return dev->archdata.fail_iommu && should_fail(&fail_iommu, 1); | |
102 | } | |
103 | ||
104 | static int __init fail_iommu_debugfs(void) | |
105 | { | |
106 | struct dentry *dir = fault_create_debugfs_attr("fail_iommu", | |
107 | NULL, &fail_iommu); | |
108 | ||
8c6ffba0 | 109 | return PTR_ERR_OR_ZERO(dir); |
d6b9a81b AB |
110 | } |
111 | late_initcall(fail_iommu_debugfs); | |
112 | ||
113 | static ssize_t fail_iommu_show(struct device *dev, | |
114 | struct device_attribute *attr, char *buf) | |
115 | { | |
116 | return sprintf(buf, "%d\n", dev->archdata.fail_iommu); | |
117 | } | |
118 | ||
119 | static ssize_t fail_iommu_store(struct device *dev, | |
120 | struct device_attribute *attr, const char *buf, | |
121 | size_t count) | |
122 | { | |
123 | int i; | |
124 | ||
125 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
126 | dev->archdata.fail_iommu = (i == 0) ? 0 : 1; | |
127 | ||
128 | return count; | |
129 | } | |
130 | ||
8a7aef2c | 131 | static DEVICE_ATTR_RW(fail_iommu); |
d6b9a81b AB |
132 | |
133 | static int fail_iommu_bus_notify(struct notifier_block *nb, | |
134 | unsigned long action, void *data) | |
135 | { | |
136 | struct device *dev = data; | |
137 | ||
138 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
139 | if (device_create_file(dev, &dev_attr_fail_iommu)) | |
140 | pr_warn("Unable to create IOMMU fault injection sysfs " | |
141 | "entries\n"); | |
142 | } else if (action == BUS_NOTIFY_DEL_DEVICE) { | |
143 | device_remove_file(dev, &dev_attr_fail_iommu); | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static struct notifier_block fail_iommu_bus_notifier = { | |
150 | .notifier_call = fail_iommu_bus_notify | |
151 | }; | |
152 | ||
153 | static int __init fail_iommu_setup(void) | |
154 | { | |
155 | #ifdef CONFIG_PCI | |
156 | bus_register_notifier(&pci_bus_type, &fail_iommu_bus_notifier); | |
157 | #endif | |
158 | #ifdef CONFIG_IBMVIO | |
159 | bus_register_notifier(&vio_bus_type, &fail_iommu_bus_notifier); | |
160 | #endif | |
161 | ||
162 | return 0; | |
163 | } | |
164 | /* | |
165 | * Must execute after PCI and VIO subsystem have initialised but before | |
166 | * devices are probed. | |
167 | */ | |
168 | arch_initcall(fail_iommu_setup); | |
169 | #else | |
170 | static inline bool should_fail_iommu(struct device *dev) | |
171 | { | |
172 | return false; | |
173 | } | |
174 | #endif | |
175 | ||
fb3475e9 FT |
176 | static unsigned long iommu_range_alloc(struct device *dev, |
177 | struct iommu_table *tbl, | |
1da177e4 LT |
178 | unsigned long npages, |
179 | unsigned long *handle, | |
7daa411b | 180 | unsigned long mask, |
1da177e4 LT |
181 | unsigned int align_order) |
182 | { | |
fb3475e9 | 183 | unsigned long n, end, start; |
1da177e4 LT |
184 | unsigned long limit; |
185 | int largealloc = npages > 15; | |
186 | int pass = 0; | |
187 | unsigned long align_mask; | |
fb3475e9 | 188 | unsigned long boundary_size; |
d3622137 | 189 | unsigned long flags; |
b4c3a872 AB |
190 | unsigned int pool_nr; |
191 | struct iommu_pool *pool; | |
1da177e4 | 192 | |
63b85621 | 193 | align_mask = (1ull << align_order) - 1; |
1da177e4 LT |
194 | |
195 | /* This allocator was derived from x86_64's bit string search */ | |
196 | ||
197 | /* Sanity check */ | |
13a2eea1 | 198 | if (unlikely(npages == 0)) { |
1da177e4 LT |
199 | if (printk_ratelimit()) |
200 | WARN_ON(1); | |
d11e3d3d | 201 | return DMA_MAPPING_ERROR; |
1da177e4 LT |
202 | } |
203 | ||
d6b9a81b | 204 | if (should_fail_iommu(dev)) |
d11e3d3d | 205 | return DMA_MAPPING_ERROR; |
d6b9a81b | 206 | |
b4c3a872 AB |
207 | /* |
208 | * We don't need to disable preemption here because any CPU can | |
209 | * safely use any IOMMU pool. | |
210 | */ | |
75f327c6 | 211 | pool_nr = raw_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1); |
d3622137 | 212 | |
b4c3a872 AB |
213 | if (largealloc) |
214 | pool = &(tbl->large_pool); | |
1da177e4 | 215 | else |
b4c3a872 | 216 | pool = &(tbl->pools[pool_nr]); |
1da177e4 | 217 | |
b4c3a872 AB |
218 | spin_lock_irqsave(&(pool->lock), flags); |
219 | ||
220 | again: | |
d900bd73 AB |
221 | if ((pass == 0) && handle && *handle && |
222 | (*handle >= pool->start) && (*handle < pool->end)) | |
b4c3a872 AB |
223 | start = *handle; |
224 | else | |
225 | start = pool->hint; | |
1da177e4 | 226 | |
b4c3a872 | 227 | limit = pool->end; |
1da177e4 LT |
228 | |
229 | /* The case below can happen if we have a small segment appended | |
230 | * to a large, or when the previous alloc was at the very end of | |
231 | * the available space. If so, go back to the initial start. | |
232 | */ | |
233 | if (start >= limit) | |
b4c3a872 | 234 | start = pool->start; |
1da177e4 | 235 | |
7daa411b OJ |
236 | if (limit + tbl->it_offset > mask) { |
237 | limit = mask - tbl->it_offset + 1; | |
238 | /* If we're constrained on address range, first try | |
239 | * at the masked hint to avoid O(n) search complexity, | |
b4c3a872 | 240 | * but on second pass, start at 0 in pool 0. |
7daa411b | 241 | */ |
b4c3a872 | 242 | if ((start & mask) >= limit || pass > 0) { |
d900bd73 | 243 | spin_unlock(&(pool->lock)); |
b4c3a872 | 244 | pool = &(tbl->pools[0]); |
d900bd73 | 245 | spin_lock(&(pool->lock)); |
b4c3a872 AB |
246 | start = pool->start; |
247 | } else { | |
7daa411b | 248 | start &= mask; |
b4c3a872 | 249 | } |
7daa411b OJ |
250 | } |
251 | ||
fb3475e9 FT |
252 | if (dev) |
253 | boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, | |
d0847757 | 254 | 1 << tbl->it_page_shift); |
fb3475e9 | 255 | else |
d0847757 | 256 | boundary_size = ALIGN(1UL << 32, 1 << tbl->it_page_shift); |
fb3475e9 | 257 | /* 4GB boundary for iseries_hv_alloc and iseries_hv_map */ |
1da177e4 | 258 | |
d0847757 AP |
259 | n = iommu_area_alloc(tbl->it_map, limit, start, npages, tbl->it_offset, |
260 | boundary_size >> tbl->it_page_shift, align_mask); | |
fb3475e9 | 261 | if (n == -1) { |
b4c3a872 AB |
262 | if (likely(pass == 0)) { |
263 | /* First try the pool from the start */ | |
264 | pool->hint = pool->start; | |
1da177e4 LT |
265 | pass++; |
266 | goto again; | |
b4c3a872 AB |
267 | |
268 | } else if (pass <= tbl->nr_pools) { | |
269 | /* Now try scanning all the other pools */ | |
270 | spin_unlock(&(pool->lock)); | |
271 | pool_nr = (pool_nr + 1) & (tbl->nr_pools - 1); | |
272 | pool = &tbl->pools[pool_nr]; | |
273 | spin_lock(&(pool->lock)); | |
274 | pool->hint = pool->start; | |
275 | pass++; | |
276 | goto again; | |
277 | ||
1da177e4 | 278 | } else { |
b4c3a872 AB |
279 | /* Give up */ |
280 | spin_unlock_irqrestore(&(pool->lock), flags); | |
d11e3d3d | 281 | return DMA_MAPPING_ERROR; |
1da177e4 LT |
282 | } |
283 | } | |
284 | ||
fb3475e9 | 285 | end = n + npages; |
1da177e4 LT |
286 | |
287 | /* Bump the hint to a new block for small allocs. */ | |
288 | if (largealloc) { | |
289 | /* Don't bump to new block to avoid fragmentation */ | |
b4c3a872 | 290 | pool->hint = end; |
1da177e4 LT |
291 | } else { |
292 | /* Overflow will be taken care of at the next allocation */ | |
b4c3a872 | 293 | pool->hint = (end + tbl->it_blocksize - 1) & |
1da177e4 LT |
294 | ~(tbl->it_blocksize - 1); |
295 | } | |
296 | ||
297 | /* Update handle for SG allocations */ | |
298 | if (handle) | |
299 | *handle = end; | |
300 | ||
b4c3a872 AB |
301 | spin_unlock_irqrestore(&(pool->lock), flags); |
302 | ||
1da177e4 LT |
303 | return n; |
304 | } | |
305 | ||
fb3475e9 FT |
306 | static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl, |
307 | void *page, unsigned int npages, | |
308 | enum dma_data_direction direction, | |
4f3dd8a0 | 309 | unsigned long mask, unsigned int align_order, |
00085f1e | 310 | unsigned long attrs) |
1da177e4 | 311 | { |
d3622137 | 312 | unsigned long entry; |
d11e3d3d | 313 | dma_addr_t ret = DMA_MAPPING_ERROR; |
6490c490 | 314 | int build_fail; |
7daa411b | 315 | |
fb3475e9 | 316 | entry = iommu_range_alloc(dev, tbl, npages, NULL, mask, align_order); |
1da177e4 | 317 | |
d11e3d3d CH |
318 | if (unlikely(entry == DMA_MAPPING_ERROR)) |
319 | return DMA_MAPPING_ERROR; | |
1da177e4 LT |
320 | |
321 | entry += tbl->it_offset; /* Offset into real TCE table */ | |
d0847757 | 322 | ret = entry << tbl->it_page_shift; /* Set the return dma address */ |
1da177e4 LT |
323 | |
324 | /* Put the TCEs in the HW table */ | |
da004c36 | 325 | build_fail = tbl->it_ops->set(tbl, entry, npages, |
d0847757 AP |
326 | (unsigned long)page & |
327 | IOMMU_PAGE_MASK(tbl), direction, attrs); | |
6490c490 | 328 | |
da004c36 | 329 | /* tbl->it_ops->set() only returns non-zero for transient errors. |
6490c490 | 330 | * Clean up the table bitmap in this case and return |
d11e3d3d | 331 | * DMA_MAPPING_ERROR. For all other errors the functionality is |
6490c490 RJ |
332 | * not altered. |
333 | */ | |
334 | if (unlikely(build_fail)) { | |
335 | __iommu_free(tbl, ret, npages); | |
d11e3d3d | 336 | return DMA_MAPPING_ERROR; |
6490c490 | 337 | } |
1da177e4 LT |
338 | |
339 | /* Flush/invalidate TLB caches if necessary */ | |
da004c36 AK |
340 | if (tbl->it_ops->flush) |
341 | tbl->it_ops->flush(tbl); | |
1da177e4 | 342 | |
1da177e4 LT |
343 | /* Make sure updates are seen by hardware */ |
344 | mb(); | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
67ca1415 AB |
349 | static bool iommu_free_check(struct iommu_table *tbl, dma_addr_t dma_addr, |
350 | unsigned int npages) | |
1da177e4 LT |
351 | { |
352 | unsigned long entry, free_entry; | |
1da177e4 | 353 | |
d0847757 | 354 | entry = dma_addr >> tbl->it_page_shift; |
1da177e4 LT |
355 | free_entry = entry - tbl->it_offset; |
356 | ||
357 | if (((free_entry + npages) > tbl->it_size) || | |
358 | (entry < tbl->it_offset)) { | |
359 | if (printk_ratelimit()) { | |
360 | printk(KERN_INFO "iommu_free: invalid entry\n"); | |
361 | printk(KERN_INFO "\tentry = 0x%lx\n", entry); | |
fe333321 IM |
362 | printk(KERN_INFO "\tdma_addr = 0x%llx\n", (u64)dma_addr); |
363 | printk(KERN_INFO "\tTable = 0x%llx\n", (u64)tbl); | |
364 | printk(KERN_INFO "\tbus# = 0x%llx\n", (u64)tbl->it_busno); | |
365 | printk(KERN_INFO "\tsize = 0x%llx\n", (u64)tbl->it_size); | |
366 | printk(KERN_INFO "\tstartOff = 0x%llx\n", (u64)tbl->it_offset); | |
367 | printk(KERN_INFO "\tindex = 0x%llx\n", (u64)tbl->it_index); | |
1da177e4 LT |
368 | WARN_ON(1); |
369 | } | |
67ca1415 AB |
370 | |
371 | return false; | |
1da177e4 LT |
372 | } |
373 | ||
67ca1415 AB |
374 | return true; |
375 | } | |
376 | ||
b4c3a872 AB |
377 | static struct iommu_pool *get_pool(struct iommu_table *tbl, |
378 | unsigned long entry) | |
379 | { | |
380 | struct iommu_pool *p; | |
381 | unsigned long largepool_start = tbl->large_pool.start; | |
382 | ||
383 | /* The large pool is the last pool at the top of the table */ | |
384 | if (entry >= largepool_start) { | |
385 | p = &tbl->large_pool; | |
386 | } else { | |
387 | unsigned int pool_nr = entry / tbl->poolsize; | |
388 | ||
389 | BUG_ON(pool_nr > tbl->nr_pools); | |
390 | p = &tbl->pools[pool_nr]; | |
391 | } | |
392 | ||
393 | return p; | |
394 | } | |
395 | ||
67ca1415 AB |
396 | static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, |
397 | unsigned int npages) | |
1da177e4 | 398 | { |
67ca1415 | 399 | unsigned long entry, free_entry; |
1da177e4 | 400 | unsigned long flags; |
b4c3a872 | 401 | struct iommu_pool *pool; |
1da177e4 | 402 | |
d0847757 | 403 | entry = dma_addr >> tbl->it_page_shift; |
67ca1415 AB |
404 | free_entry = entry - tbl->it_offset; |
405 | ||
b4c3a872 AB |
406 | pool = get_pool(tbl, free_entry); |
407 | ||
67ca1415 AB |
408 | if (!iommu_free_check(tbl, dma_addr, npages)) |
409 | return; | |
410 | ||
da004c36 | 411 | tbl->it_ops->clear(tbl, entry, npages); |
67ca1415 | 412 | |
b4c3a872 | 413 | spin_lock_irqsave(&(pool->lock), flags); |
67ca1415 | 414 | bitmap_clear(tbl->it_map, free_entry, npages); |
b4c3a872 | 415 | spin_unlock_irqrestore(&(pool->lock), flags); |
67ca1415 AB |
416 | } |
417 | ||
418 | static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, | |
419 | unsigned int npages) | |
420 | { | |
421 | __iommu_free(tbl, dma_addr, npages); | |
1da177e4 LT |
422 | |
423 | /* Make sure TLB cache is flushed if the HW needs it. We do | |
424 | * not do an mb() here on purpose, it is not needed on any of | |
425 | * the current platforms. | |
426 | */ | |
da004c36 AK |
427 | if (tbl->it_ops->flush) |
428 | tbl->it_ops->flush(tbl); | |
1da177e4 LT |
429 | } |
430 | ||
0690cbd2 JR |
431 | int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, |
432 | struct scatterlist *sglist, int nelems, | |
433 | unsigned long mask, enum dma_data_direction direction, | |
00085f1e | 434 | unsigned long attrs) |
1da177e4 LT |
435 | { |
436 | dma_addr_t dma_next = 0, dma_addr; | |
1da177e4 | 437 | struct scatterlist *s, *outs, *segstart; |
6490c490 | 438 | int outcount, incount, i, build_fail = 0; |
d262c32a | 439 | unsigned int align; |
1da177e4 | 440 | unsigned long handle; |
740c3ce6 | 441 | unsigned int max_seg_size; |
1da177e4 LT |
442 | |
443 | BUG_ON(direction == DMA_NONE); | |
444 | ||
445 | if ((nelems == 0) || !tbl) | |
446 | return 0; | |
447 | ||
448 | outs = s = segstart = &sglist[0]; | |
449 | outcount = 1; | |
ac9af7cb | 450 | incount = nelems; |
1da177e4 LT |
451 | handle = 0; |
452 | ||
453 | /* Init first segment length for backout at failure */ | |
454 | outs->dma_length = 0; | |
455 | ||
5d2efba6 | 456 | DBG("sg mapping %d elements:\n", nelems); |
1da177e4 | 457 | |
740c3ce6 | 458 | max_seg_size = dma_get_max_seg_size(dev); |
78bdc310 | 459 | for_each_sg(sglist, s, nelems, i) { |
1da177e4 LT |
460 | unsigned long vaddr, npages, entry, slen; |
461 | ||
462 | slen = s->length; | |
463 | /* Sanity check */ | |
464 | if (slen == 0) { | |
465 | dma_next = 0; | |
466 | continue; | |
467 | } | |
468 | /* Allocate iommu entries for that segment */ | |
58b053e4 | 469 | vaddr = (unsigned long) sg_virt(s); |
d0847757 | 470 | npages = iommu_num_pages(vaddr, slen, IOMMU_PAGE_SIZE(tbl)); |
d262c32a | 471 | align = 0; |
d0847757 | 472 | if (tbl->it_page_shift < PAGE_SHIFT && slen >= PAGE_SIZE && |
d262c32a | 473 | (vaddr & ~PAGE_MASK) == 0) |
d0847757 | 474 | align = PAGE_SHIFT - tbl->it_page_shift; |
fb3475e9 | 475 | entry = iommu_range_alloc(dev, tbl, npages, &handle, |
d0847757 | 476 | mask >> tbl->it_page_shift, align); |
1da177e4 LT |
477 | |
478 | DBG(" - vaddr: %lx, size: %lx\n", vaddr, slen); | |
479 | ||
480 | /* Handle failure */ | |
d11e3d3d | 481 | if (unlikely(entry == DMA_MAPPING_ERROR)) { |
af8a2498 MFO |
482 | if (!(attrs & DMA_ATTR_NO_WARN) && |
483 | printk_ratelimit()) | |
4dfa9c47 AB |
484 | dev_info(dev, "iommu_alloc failed, tbl %p " |
485 | "vaddr %lx npages %lu\n", tbl, vaddr, | |
486 | npages); | |
1da177e4 LT |
487 | goto failure; |
488 | } | |
489 | ||
490 | /* Convert entry to a dma_addr_t */ | |
491 | entry += tbl->it_offset; | |
d0847757 AP |
492 | dma_addr = entry << tbl->it_page_shift; |
493 | dma_addr |= (s->offset & ~IOMMU_PAGE_MASK(tbl)); | |
1da177e4 | 494 | |
5d2efba6 | 495 | DBG(" - %lu pages, entry: %lx, dma_addr: %lx\n", |
1da177e4 LT |
496 | npages, entry, dma_addr); |
497 | ||
498 | /* Insert into HW table */ | |
da004c36 | 499 | build_fail = tbl->it_ops->set(tbl, entry, npages, |
d0847757 AP |
500 | vaddr & IOMMU_PAGE_MASK(tbl), |
501 | direction, attrs); | |
6490c490 RJ |
502 | if(unlikely(build_fail)) |
503 | goto failure; | |
1da177e4 LT |
504 | |
505 | /* If we are in an open segment, try merging */ | |
506 | if (segstart != s) { | |
507 | DBG(" - trying merge...\n"); | |
508 | /* We cannot merge if: | |
509 | * - allocated dma_addr isn't contiguous to previous allocation | |
510 | */ | |
740c3ce6 FT |
511 | if (novmerge || (dma_addr != dma_next) || |
512 | (outs->dma_length + s->length > max_seg_size)) { | |
1da177e4 LT |
513 | /* Can't merge: create a new segment */ |
514 | segstart = s; | |
78bdc310 JA |
515 | outcount++; |
516 | outs = sg_next(outs); | |
1da177e4 LT |
517 | DBG(" can't merge, new segment.\n"); |
518 | } else { | |
519 | outs->dma_length += s->length; | |
5d2efba6 | 520 | DBG(" merged, new len: %ux\n", outs->dma_length); |
1da177e4 LT |
521 | } |
522 | } | |
523 | ||
524 | if (segstart == s) { | |
525 | /* This is a new segment, fill entries */ | |
526 | DBG(" - filling new segment.\n"); | |
527 | outs->dma_address = dma_addr; | |
528 | outs->dma_length = slen; | |
529 | } | |
530 | ||
531 | /* Calculate next page pointer for contiguous check */ | |
532 | dma_next = dma_addr + slen; | |
533 | ||
534 | DBG(" - dma next is: %lx\n", dma_next); | |
535 | } | |
536 | ||
537 | /* Flush/invalidate TLB caches if necessary */ | |
da004c36 AK |
538 | if (tbl->it_ops->flush) |
539 | tbl->it_ops->flush(tbl); | |
1da177e4 | 540 | |
1da177e4 LT |
541 | DBG("mapped %d elements:\n", outcount); |
542 | ||
0690cbd2 | 543 | /* For the sake of ppc_iommu_unmap_sg, we clear out the length in the |
1da177e4 LT |
544 | * next entry of the sglist if we didn't fill the list completely |
545 | */ | |
ac9af7cb | 546 | if (outcount < incount) { |
78bdc310 | 547 | outs = sg_next(outs); |
d11e3d3d | 548 | outs->dma_address = DMA_MAPPING_ERROR; |
1da177e4 LT |
549 | outs->dma_length = 0; |
550 | } | |
a958a264 JM |
551 | |
552 | /* Make sure updates are seen by hardware */ | |
553 | mb(); | |
554 | ||
1da177e4 LT |
555 | return outcount; |
556 | ||
557 | failure: | |
78bdc310 | 558 | for_each_sg(sglist, s, nelems, i) { |
1da177e4 LT |
559 | if (s->dma_length != 0) { |
560 | unsigned long vaddr, npages; | |
561 | ||
d0847757 | 562 | vaddr = s->dma_address & IOMMU_PAGE_MASK(tbl); |
2994a3b2 | 563 | npages = iommu_num_pages(s->dma_address, s->dma_length, |
d0847757 | 564 | IOMMU_PAGE_SIZE(tbl)); |
d3622137 | 565 | __iommu_free(tbl, vaddr, npages); |
d11e3d3d | 566 | s->dma_address = DMA_MAPPING_ERROR; |
a958a264 | 567 | s->dma_length = 0; |
1da177e4 | 568 | } |
78bdc310 JA |
569 | if (s == outs) |
570 | break; | |
1da177e4 | 571 | } |
1da177e4 LT |
572 | return 0; |
573 | } | |
574 | ||
575 | ||
0690cbd2 JR |
576 | void ppc_iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, |
577 | int nelems, enum dma_data_direction direction, | |
00085f1e | 578 | unsigned long attrs) |
1da177e4 | 579 | { |
78bdc310 | 580 | struct scatterlist *sg; |
1da177e4 LT |
581 | |
582 | BUG_ON(direction == DMA_NONE); | |
583 | ||
584 | if (!tbl) | |
585 | return; | |
586 | ||
78bdc310 | 587 | sg = sglist; |
1da177e4 LT |
588 | while (nelems--) { |
589 | unsigned int npages; | |
78bdc310 | 590 | dma_addr_t dma_handle = sg->dma_address; |
1da177e4 | 591 | |
78bdc310 | 592 | if (sg->dma_length == 0) |
1da177e4 | 593 | break; |
2994a3b2 | 594 | npages = iommu_num_pages(dma_handle, sg->dma_length, |
d0847757 | 595 | IOMMU_PAGE_SIZE(tbl)); |
d3622137 | 596 | __iommu_free(tbl, dma_handle, npages); |
78bdc310 | 597 | sg = sg_next(sg); |
1da177e4 LT |
598 | } |
599 | ||
600 | /* Flush/invalidate TLBs if necessary. As for iommu_free(), we | |
601 | * do not do an mb() here, the affected platforms do not need it | |
602 | * when freeing. | |
603 | */ | |
da004c36 AK |
604 | if (tbl->it_ops->flush) |
605 | tbl->it_ops->flush(tbl); | |
1da177e4 LT |
606 | } |
607 | ||
54622f10 MK |
608 | static void iommu_table_clear(struct iommu_table *tbl) |
609 | { | |
3ccc00a7 MS |
610 | /* |
611 | * In case of firmware assisted dump system goes through clean | |
612 | * reboot process at the time of system crash. Hence it's safe to | |
613 | * clear the TCE entries if firmware assisted dump is active. | |
614 | */ | |
615 | if (!is_kdump_kernel() || is_fadump_active()) { | |
54622f10 | 616 | /* Clear the table in case firmware left allocations in it */ |
da004c36 | 617 | tbl->it_ops->clear(tbl, tbl->it_offset, tbl->it_size); |
54622f10 MK |
618 | return; |
619 | } | |
620 | ||
621 | #ifdef CONFIG_CRASH_DUMP | |
da004c36 | 622 | if (tbl->it_ops->get) { |
54622f10 MK |
623 | unsigned long index, tceval, tcecount = 0; |
624 | ||
625 | /* Reserve the existing mappings left by the first kernel. */ | |
626 | for (index = 0; index < tbl->it_size; index++) { | |
da004c36 | 627 | tceval = tbl->it_ops->get(tbl, index + tbl->it_offset); |
54622f10 MK |
628 | /* |
629 | * Freed TCE entry contains 0x7fffffffffffffff on JS20 | |
630 | */ | |
631 | if (tceval && (tceval != 0x7fffffffffffffffUL)) { | |
632 | __set_bit(index, tbl->it_map); | |
633 | tcecount++; | |
634 | } | |
635 | } | |
636 | ||
637 | if ((tbl->it_size - tcecount) < KDUMP_MIN_TCE_ENTRIES) { | |
638 | printk(KERN_WARNING "TCE table is full; freeing "); | |
639 | printk(KERN_WARNING "%d entries for the kdump boot\n", | |
640 | KDUMP_MIN_TCE_ENTRIES); | |
641 | for (index = tbl->it_size - KDUMP_MIN_TCE_ENTRIES; | |
642 | index < tbl->it_size; index++) | |
643 | __clear_bit(index, tbl->it_map); | |
644 | } | |
645 | } | |
646 | #endif | |
647 | } | |
648 | ||
1da177e4 LT |
649 | /* |
650 | * Build a iommu_table structure. This contains a bit map which | |
651 | * is used to manage allocation of the tce space. | |
652 | */ | |
ca1588e7 | 653 | struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid) |
1da177e4 LT |
654 | { |
655 | unsigned long sz; | |
656 | static int welcomed = 0; | |
ca1588e7 | 657 | struct page *page; |
b4c3a872 AB |
658 | unsigned int i; |
659 | struct iommu_pool *p; | |
1da177e4 | 660 | |
da004c36 AK |
661 | BUG_ON(!tbl->it_ops); |
662 | ||
1da177e4 | 663 | /* number of bytes needed for the bitmap */ |
c5a0809a | 664 | sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long); |
1da177e4 | 665 | |
1cf389df | 666 | page = alloc_pages_node(nid, GFP_KERNEL, get_order(sz)); |
ca1588e7 | 667 | if (!page) |
1da177e4 | 668 | panic("iommu_init_table: Can't allocate %ld bytes\n", sz); |
ca1588e7 | 669 | tbl->it_map = page_address(page); |
1da177e4 LT |
670 | memset(tbl->it_map, 0, sz); |
671 | ||
d12b524f TLSC |
672 | /* |
673 | * Reserve page 0 so it will not be used for any mappings. | |
674 | * This avoids buggy drivers that consider page 0 to be invalid | |
675 | * to crash the machine or even lose data. | |
676 | */ | |
677 | if (tbl->it_offset == 0) | |
678 | set_bit(0, tbl->it_map); | |
679 | ||
b4c3a872 | 680 | /* We only split the IOMMU table if we have 1GB or more of space */ |
d0847757 | 681 | if ((tbl->it_size << tbl->it_page_shift) >= (1UL * 1024 * 1024 * 1024)) |
b4c3a872 AB |
682 | tbl->nr_pools = IOMMU_NR_POOLS; |
683 | else | |
684 | tbl->nr_pools = 1; | |
685 | ||
686 | /* We reserve the top 1/4 of the table for large allocations */ | |
dcd261ba | 687 | tbl->poolsize = (tbl->it_size * 3 / 4) / tbl->nr_pools; |
b4c3a872 | 688 | |
dcd261ba | 689 | for (i = 0; i < tbl->nr_pools; i++) { |
b4c3a872 AB |
690 | p = &tbl->pools[i]; |
691 | spin_lock_init(&(p->lock)); | |
692 | p->start = tbl->poolsize * i; | |
693 | p->hint = p->start; | |
694 | p->end = p->start + tbl->poolsize; | |
695 | } | |
696 | ||
697 | p = &tbl->large_pool; | |
698 | spin_lock_init(&(p->lock)); | |
699 | p->start = tbl->poolsize * i; | |
700 | p->hint = p->start; | |
701 | p->end = tbl->it_size; | |
1da177e4 | 702 | |
54622f10 | 703 | iommu_table_clear(tbl); |
d3588ba9 | 704 | |
1da177e4 LT |
705 | if (!welcomed) { |
706 | printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n", | |
707 | novmerge ? "disabled" : "enabled"); | |
708 | welcomed = 1; | |
709 | } | |
710 | ||
711 | return tbl; | |
712 | } | |
713 | ||
e5afdf9d | 714 | static void iommu_table_free(struct kref *kref) |
1da177e4 | 715 | { |
c5a0809a | 716 | unsigned long bitmap_sz; |
1da177e4 | 717 | unsigned int order; |
e5afdf9d | 718 | struct iommu_table *tbl; |
1da177e4 | 719 | |
e5afdf9d | 720 | tbl = container_of(kref, struct iommu_table, it_kref); |
8aca92d8 | 721 | |
11edf116 AK |
722 | if (tbl->it_ops->free) |
723 | tbl->it_ops->free(tbl); | |
724 | ||
8aca92d8 AK |
725 | if (!tbl->it_map) { |
726 | kfree(tbl); | |
1da177e4 LT |
727 | return; |
728 | } | |
729 | ||
7f966d39 TLSC |
730 | /* |
731 | * In case we have reserved the first bit, we should not emit | |
732 | * the warning below. | |
733 | */ | |
734 | if (tbl->it_offset == 0) | |
735 | clear_bit(0, tbl->it_map); | |
736 | ||
1da177e4 | 737 | /* verify that table contains no entries */ |
c5a0809a | 738 | if (!bitmap_empty(tbl->it_map, tbl->it_size)) |
e5afdf9d | 739 | pr_warn("%s: Unexpected TCEs\n", __func__); |
1da177e4 LT |
740 | |
741 | /* calculate bitmap size in bytes */ | |
c5a0809a | 742 | bitmap_sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long); |
1da177e4 LT |
743 | |
744 | /* free bitmap */ | |
745 | order = get_order(bitmap_sz); | |
746 | free_pages((unsigned long) tbl->it_map, order); | |
747 | ||
748 | /* free table */ | |
749 | kfree(tbl); | |
750 | } | |
e5afdf9d AK |
751 | |
752 | struct iommu_table *iommu_tce_table_get(struct iommu_table *tbl) | |
753 | { | |
754 | if (kref_get_unless_zero(&tbl->it_kref)) | |
755 | return tbl; | |
756 | ||
757 | return NULL; | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(iommu_tce_table_get); | |
760 | ||
761 | int iommu_tce_table_put(struct iommu_table *tbl) | |
762 | { | |
763 | if (WARN_ON(!tbl)) | |
764 | return 0; | |
765 | ||
766 | return kref_put(&tbl->it_kref, iommu_table_free); | |
767 | } | |
768 | EXPORT_SYMBOL_GPL(iommu_tce_table_put); | |
1da177e4 LT |
769 | |
770 | /* Creates TCEs for a user provided buffer. The user buffer must be | |
f9226d57 MN |
771 | * contiguous real kernel storage (not vmalloc). The address passed here |
772 | * comprises a page address and offset into that page. The dma_addr_t | |
773 | * returned will point to the same byte within the page as was passed in. | |
1da177e4 | 774 | */ |
f9226d57 MN |
775 | dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, |
776 | struct page *page, unsigned long offset, size_t size, | |
777 | unsigned long mask, enum dma_data_direction direction, | |
00085f1e | 778 | unsigned long attrs) |
1da177e4 | 779 | { |
d11e3d3d | 780 | dma_addr_t dma_handle = DMA_MAPPING_ERROR; |
f9226d57 | 781 | void *vaddr; |
1da177e4 | 782 | unsigned long uaddr; |
d262c32a | 783 | unsigned int npages, align; |
1da177e4 LT |
784 | |
785 | BUG_ON(direction == DMA_NONE); | |
786 | ||
f9226d57 | 787 | vaddr = page_address(page) + offset; |
1da177e4 | 788 | uaddr = (unsigned long)vaddr; |
1da177e4 LT |
789 | |
790 | if (tbl) { | |
984ecdd6 | 791 | npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE(tbl)); |
d262c32a | 792 | align = 0; |
d0847757 | 793 | if (tbl->it_page_shift < PAGE_SHIFT && size >= PAGE_SIZE && |
d262c32a | 794 | ((unsigned long)vaddr & ~PAGE_MASK) == 0) |
d0847757 | 795 | align = PAGE_SHIFT - tbl->it_page_shift; |
d262c32a | 796 | |
fb3475e9 | 797 | dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction, |
d0847757 | 798 | mask >> tbl->it_page_shift, align, |
4f3dd8a0 | 799 | attrs); |
d11e3d3d | 800 | if (dma_handle == DMA_MAPPING_ERROR) { |
af8a2498 MFO |
801 | if (!(attrs & DMA_ATTR_NO_WARN) && |
802 | printk_ratelimit()) { | |
4dfa9c47 AB |
803 | dev_info(dev, "iommu_alloc failed, tbl %p " |
804 | "vaddr %p npages %d\n", tbl, vaddr, | |
805 | npages); | |
1da177e4 LT |
806 | } |
807 | } else | |
d0847757 | 808 | dma_handle |= (uaddr & ~IOMMU_PAGE_MASK(tbl)); |
1da177e4 LT |
809 | } |
810 | ||
811 | return dma_handle; | |
812 | } | |
813 | ||
f9226d57 MN |
814 | void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle, |
815 | size_t size, enum dma_data_direction direction, | |
00085f1e | 816 | unsigned long attrs) |
1da177e4 | 817 | { |
5d2efba6 LV |
818 | unsigned int npages; |
819 | ||
1da177e4 LT |
820 | BUG_ON(direction == DMA_NONE); |
821 | ||
5d2efba6 | 822 | if (tbl) { |
d0847757 AP |
823 | npages = iommu_num_pages(dma_handle, size, |
824 | IOMMU_PAGE_SIZE(tbl)); | |
5d2efba6 LV |
825 | iommu_free(tbl, dma_handle, npages); |
826 | } | |
1da177e4 LT |
827 | } |
828 | ||
829 | /* Allocates a contiguous real buffer and creates mappings over it. | |
830 | * Returns the virtual address of the buffer and sets dma_handle | |
831 | * to the dma address (mapping) of the first page. | |
832 | */ | |
fb3475e9 FT |
833 | void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, |
834 | size_t size, dma_addr_t *dma_handle, | |
835 | unsigned long mask, gfp_t flag, int node) | |
1da177e4 LT |
836 | { |
837 | void *ret = NULL; | |
838 | dma_addr_t mapping; | |
5d2efba6 LV |
839 | unsigned int order; |
840 | unsigned int nio_pages, io_order; | |
8eb6c6e3 | 841 | struct page *page; |
1da177e4 LT |
842 | |
843 | size = PAGE_ALIGN(size); | |
1da177e4 LT |
844 | order = get_order(size); |
845 | ||
846 | /* | |
847 | * Client asked for way too much space. This is checked later | |
848 | * anyway. It is easier to debug here for the drivers than in | |
849 | * the tce tables. | |
850 | */ | |
851 | if (order >= IOMAP_MAX_ORDER) { | |
4dfa9c47 AB |
852 | dev_info(dev, "iommu_alloc_consistent size too large: 0x%lx\n", |
853 | size); | |
1da177e4 LT |
854 | return NULL; |
855 | } | |
856 | ||
857 | if (!tbl) | |
858 | return NULL; | |
859 | ||
860 | /* Alloc enough pages (and possibly more) */ | |
05061354 | 861 | page = alloc_pages_node(node, flag, order); |
8eb6c6e3 | 862 | if (!page) |
1da177e4 | 863 | return NULL; |
8eb6c6e3 | 864 | ret = page_address(page); |
1da177e4 LT |
865 | memset(ret, 0, size); |
866 | ||
867 | /* Set up tces to cover the allocated range */ | |
d0847757 AP |
868 | nio_pages = size >> tbl->it_page_shift; |
869 | io_order = get_iommu_order(size, tbl); | |
fb3475e9 | 870 | mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL, |
00085f1e | 871 | mask >> tbl->it_page_shift, io_order, 0); |
d11e3d3d | 872 | if (mapping == DMA_MAPPING_ERROR) { |
1da177e4 | 873 | free_pages((unsigned long)ret, order); |
8eb6c6e3 CH |
874 | return NULL; |
875 | } | |
876 | *dma_handle = mapping; | |
1da177e4 LT |
877 | return ret; |
878 | } | |
879 | ||
880 | void iommu_free_coherent(struct iommu_table *tbl, size_t size, | |
881 | void *vaddr, dma_addr_t dma_handle) | |
882 | { | |
1da177e4 | 883 | if (tbl) { |
5d2efba6 LV |
884 | unsigned int nio_pages; |
885 | ||
886 | size = PAGE_ALIGN(size); | |
d0847757 | 887 | nio_pages = size >> tbl->it_page_shift; |
5d2efba6 | 888 | iommu_free(tbl, dma_handle, nio_pages); |
1da177e4 | 889 | size = PAGE_ALIGN(size); |
1da177e4 LT |
890 | free_pages((unsigned long)vaddr, get_order(size)); |
891 | } | |
892 | } | |
4e13c1ac | 893 | |
10b35b2b AK |
894 | unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir) |
895 | { | |
896 | switch (dir) { | |
897 | case DMA_BIDIRECTIONAL: | |
898 | return TCE_PCI_READ | TCE_PCI_WRITE; | |
899 | case DMA_FROM_DEVICE: | |
900 | return TCE_PCI_WRITE; | |
901 | case DMA_TO_DEVICE: | |
902 | return TCE_PCI_READ; | |
903 | default: | |
904 | return 0; | |
905 | } | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(iommu_direction_to_tce_perm); | |
908 | ||
4e13c1ac AK |
909 | #ifdef CONFIG_IOMMU_API |
910 | /* | |
911 | * SPAPR TCE API | |
912 | */ | |
913 | static void group_release(void *iommu_data) | |
914 | { | |
b348aa65 AK |
915 | struct iommu_table_group *table_group = iommu_data; |
916 | ||
917 | table_group->group = NULL; | |
4e13c1ac AK |
918 | } |
919 | ||
b348aa65 | 920 | void iommu_register_group(struct iommu_table_group *table_group, |
4e13c1ac AK |
921 | int pci_domain_number, unsigned long pe_num) |
922 | { | |
923 | struct iommu_group *grp; | |
924 | char *name; | |
925 | ||
926 | grp = iommu_group_alloc(); | |
927 | if (IS_ERR(grp)) { | |
928 | pr_warn("powerpc iommu api: cannot create new group, err=%ld\n", | |
929 | PTR_ERR(grp)); | |
930 | return; | |
931 | } | |
b348aa65 AK |
932 | table_group->group = grp; |
933 | iommu_group_set_iommudata(grp, table_group, group_release); | |
4e13c1ac AK |
934 | name = kasprintf(GFP_KERNEL, "domain%d-pe%lx", |
935 | pci_domain_number, pe_num); | |
936 | if (!name) | |
937 | return; | |
938 | iommu_group_set_name(grp, name); | |
939 | kfree(name); | |
940 | } | |
941 | ||
942 | enum dma_data_direction iommu_tce_direction(unsigned long tce) | |
943 | { | |
944 | if ((tce & TCE_PCI_READ) && (tce & TCE_PCI_WRITE)) | |
945 | return DMA_BIDIRECTIONAL; | |
946 | else if (tce & TCE_PCI_READ) | |
947 | return DMA_TO_DEVICE; | |
948 | else if (tce & TCE_PCI_WRITE) | |
949 | return DMA_FROM_DEVICE; | |
950 | else | |
951 | return DMA_NONE; | |
952 | } | |
953 | EXPORT_SYMBOL_GPL(iommu_tce_direction); | |
954 | ||
955 | void iommu_flush_tce(struct iommu_table *tbl) | |
956 | { | |
957 | /* Flush/invalidate TLB caches if necessary */ | |
da004c36 AK |
958 | if (tbl->it_ops->flush) |
959 | tbl->it_ops->flush(tbl); | |
4e13c1ac AK |
960 | |
961 | /* Make sure updates are seen by hardware */ | |
962 | mb(); | |
963 | } | |
964 | EXPORT_SYMBOL_GPL(iommu_flush_tce); | |
965 | ||
b1af23d8 AK |
966 | int iommu_tce_check_ioba(unsigned long page_shift, |
967 | unsigned long offset, unsigned long size, | |
968 | unsigned long ioba, unsigned long npages) | |
4e13c1ac | 969 | { |
b1af23d8 | 970 | unsigned long mask = (1UL << page_shift) - 1; |
4e13c1ac | 971 | |
b1af23d8 | 972 | if (ioba & mask) |
4e13c1ac AK |
973 | return -EINVAL; |
974 | ||
b1af23d8 AK |
975 | ioba >>= page_shift; |
976 | if (ioba < offset) | |
4e13c1ac AK |
977 | return -EINVAL; |
978 | ||
b1af23d8 | 979 | if ((ioba + 1) > (offset + size)) |
4e13c1ac AK |
980 | return -EINVAL; |
981 | ||
982 | return 0; | |
983 | } | |
b1af23d8 | 984 | EXPORT_SYMBOL_GPL(iommu_tce_check_ioba); |
4e13c1ac | 985 | |
b1af23d8 | 986 | int iommu_tce_check_gpa(unsigned long page_shift, unsigned long gpa) |
4e13c1ac | 987 | { |
b1af23d8 | 988 | unsigned long mask = (1UL << page_shift) - 1; |
4e13c1ac | 989 | |
b1af23d8 | 990 | if (gpa & mask) |
4e13c1ac AK |
991 | return -EINVAL; |
992 | ||
993 | return 0; | |
994 | } | |
b1af23d8 | 995 | EXPORT_SYMBOL_GPL(iommu_tce_check_gpa); |
4e13c1ac | 996 | |
c10c21ef AK |
997 | long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl, |
998 | unsigned long entry, unsigned long *hpa, | |
999 | enum dma_data_direction *direction) | |
4e13c1ac | 1000 | { |
05c6cfb9 | 1001 | long ret; |
c10c21ef | 1002 | unsigned long size = 0; |
4e13c1ac | 1003 | |
05c6cfb9 | 1004 | ret = tbl->it_ops->exchange(tbl, entry, hpa, direction); |
4e13c1ac | 1005 | |
05c6cfb9 | 1006 | if (!ret && ((*direction == DMA_FROM_DEVICE) || |
c10c21ef AK |
1007 | (*direction == DMA_BIDIRECTIONAL)) && |
1008 | !mm_iommu_is_devmem(mm, *hpa, tbl->it_page_shift, | |
1009 | &size)) | |
05c6cfb9 | 1010 | SetPageDirty(pfn_to_page(*hpa >> PAGE_SHIFT)); |
4e13c1ac AK |
1011 | |
1012 | /* if (unlikely(ret)) | |
1013 | pr_err("iommu_tce: %s failed on hwaddr=%lx ioba=%lx kva=%lx ret=%d\n", | |
84f1966e | 1014 | __func__, hwaddr, entry << tbl->it_page_shift, |
4e13c1ac AK |
1015 | hwaddr, ret); */ |
1016 | ||
1017 | return ret; | |
1018 | } | |
05c6cfb9 | 1019 | EXPORT_SYMBOL_GPL(iommu_tce_xchg); |
4e13c1ac | 1020 | |
4e13c1ac AK |
1021 | int iommu_take_ownership(struct iommu_table *tbl) |
1022 | { | |
b82c75bf AK |
1023 | unsigned long flags, i, sz = (tbl->it_size + 7) >> 3; |
1024 | int ret = 0; | |
1025 | ||
05c6cfb9 AK |
1026 | /* |
1027 | * VFIO does not control TCE entries allocation and the guest | |
1028 | * can write new TCEs on top of existing ones so iommu_tce_build() | |
1029 | * must be able to release old pages. This functionality | |
1030 | * requires exchange() callback defined so if it is not | |
1031 | * implemented, we disallow taking ownership over the table. | |
1032 | */ | |
1033 | if (!tbl->it_ops->exchange) | |
1034 | return -EINVAL; | |
1035 | ||
b82c75bf AK |
1036 | spin_lock_irqsave(&tbl->large_pool.lock, flags); |
1037 | for (i = 0; i < tbl->nr_pools; i++) | |
1038 | spin_lock(&tbl->pools[i].lock); | |
4e13c1ac AK |
1039 | |
1040 | if (tbl->it_offset == 0) | |
1041 | clear_bit(0, tbl->it_map); | |
1042 | ||
1043 | if (!bitmap_empty(tbl->it_map, tbl->it_size)) { | |
1044 | pr_err("iommu_tce: it_map is not empty"); | |
b82c75bf AK |
1045 | ret = -EBUSY; |
1046 | /* Restore bit#0 set by iommu_init_table() */ | |
1047 | if (tbl->it_offset == 0) | |
1048 | set_bit(0, tbl->it_map); | |
1049 | } else { | |
1050 | memset(tbl->it_map, 0xff, sz); | |
4e13c1ac AK |
1051 | } |
1052 | ||
b82c75bf AK |
1053 | for (i = 0; i < tbl->nr_pools; i++) |
1054 | spin_unlock(&tbl->pools[i].lock); | |
1055 | spin_unlock_irqrestore(&tbl->large_pool.lock, flags); | |
4e13c1ac | 1056 | |
b82c75bf | 1057 | return ret; |
4e13c1ac AK |
1058 | } |
1059 | EXPORT_SYMBOL_GPL(iommu_take_ownership); | |
1060 | ||
1061 | void iommu_release_ownership(struct iommu_table *tbl) | |
1062 | { | |
b82c75bf AK |
1063 | unsigned long flags, i, sz = (tbl->it_size + 7) >> 3; |
1064 | ||
1065 | spin_lock_irqsave(&tbl->large_pool.lock, flags); | |
1066 | for (i = 0; i < tbl->nr_pools; i++) | |
1067 | spin_lock(&tbl->pools[i].lock); | |
4e13c1ac | 1068 | |
4e13c1ac AK |
1069 | memset(tbl->it_map, 0, sz); |
1070 | ||
1071 | /* Restore bit#0 set by iommu_init_table() */ | |
1072 | if (tbl->it_offset == 0) | |
1073 | set_bit(0, tbl->it_map); | |
b82c75bf AK |
1074 | |
1075 | for (i = 0; i < tbl->nr_pools; i++) | |
1076 | spin_unlock(&tbl->pools[i].lock); | |
1077 | spin_unlock_irqrestore(&tbl->large_pool.lock, flags); | |
4e13c1ac AK |
1078 | } |
1079 | EXPORT_SYMBOL_GPL(iommu_release_ownership); | |
1080 | ||
c4e9d3c1 | 1081 | int iommu_add_device(struct iommu_table_group *table_group, struct device *dev) |
4e13c1ac | 1082 | { |
763fe0ad GS |
1083 | /* |
1084 | * The sysfs entries should be populated before | |
1085 | * binding IOMMU group. If sysfs entries isn't | |
1086 | * ready, we simply bail. | |
1087 | */ | |
1088 | if (!device_is_registered(dev)) | |
1089 | return -ENOENT; | |
1090 | ||
bf8763d8 | 1091 | if (device_iommu_mapped(dev)) { |
763fe0ad GS |
1092 | pr_debug("%s: Skipping device %s with iommu group %d\n", |
1093 | __func__, dev_name(dev), | |
1094 | iommu_group_id(dev->iommu_group)); | |
4e13c1ac AK |
1095 | return -EBUSY; |
1096 | } | |
1097 | ||
763fe0ad | 1098 | pr_debug("%s: Adding %s to iommu group %d\n", |
c4e9d3c1 | 1099 | __func__, dev_name(dev), iommu_group_id(table_group->group)); |
d0847757 | 1100 | |
c4e9d3c1 | 1101 | return iommu_group_add_device(table_group->group, dev); |
4e13c1ac | 1102 | } |
d905c5df | 1103 | EXPORT_SYMBOL_GPL(iommu_add_device); |
4e13c1ac | 1104 | |
d905c5df | 1105 | void iommu_del_device(struct device *dev) |
4e13c1ac | 1106 | { |
0c4b9e27 GS |
1107 | /* |
1108 | * Some devices might not have IOMMU table and group | |
1109 | * and we needn't detach them from the associated | |
1110 | * IOMMU groups | |
1111 | */ | |
bf8763d8 | 1112 | if (!device_iommu_mapped(dev)) { |
0c4b9e27 GS |
1113 | pr_debug("iommu_tce: skipping device %s with no tbl\n", |
1114 | dev_name(dev)); | |
1115 | return; | |
1116 | } | |
1117 | ||
4e13c1ac AK |
1118 | iommu_group_remove_device(dev); |
1119 | } | |
d905c5df | 1120 | EXPORT_SYMBOL_GPL(iommu_del_device); |
4e13c1ac | 1121 | #endif /* CONFIG_IOMMU_API */ |