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ab68f262 | 1 | /* |
7b6be844 | 2 | * Copyright(c) 2016 - 2017 Intel Corporation. All rights reserved. |
ab68f262 DW |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/pfn_t.h> | |
ba09c01d | 17 | #include <linux/cdev.h> |
ab68f262 DW |
18 | #include <linux/slab.h> |
19 | #include <linux/dax.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/mm.h> | |
ef842302 | 22 | #include <linux/mman.h> |
efebc711 | 23 | #include "dax-private.h" |
ccdb07f6 | 24 | #include "dax.h" |
ab68f262 | 25 | |
ab68f262 | 26 | static struct class *dax_class; |
ab68f262 | 27 | |
565851c9 DW |
28 | /* |
29 | * Rely on the fact that drvdata is set before the attributes are | |
30 | * registered, and that the attributes are unregistered before drvdata | |
31 | * is cleared to assume that drvdata is always valid. | |
32 | */ | |
d7fe1a67 DW |
33 | static ssize_t id_show(struct device *dev, |
34 | struct device_attribute *attr, char *buf) | |
35 | { | |
565851c9 | 36 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 37 | |
565851c9 | 38 | return sprintf(buf, "%d\n", dax_region->id); |
d7fe1a67 DW |
39 | } |
40 | static DEVICE_ATTR_RO(id); | |
41 | ||
42 | static ssize_t region_size_show(struct device *dev, | |
43 | struct device_attribute *attr, char *buf) | |
44 | { | |
565851c9 | 45 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 46 | |
565851c9 DW |
47 | return sprintf(buf, "%llu\n", (unsigned long long) |
48 | resource_size(&dax_region->res)); | |
d7fe1a67 DW |
49 | } |
50 | static struct device_attribute dev_attr_region_size = __ATTR(size, 0444, | |
51 | region_size_show, NULL); | |
52 | ||
53 | static ssize_t align_show(struct device *dev, | |
54 | struct device_attribute *attr, char *buf) | |
55 | { | |
565851c9 | 56 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 57 | |
565851c9 | 58 | return sprintf(buf, "%u\n", dax_region->align); |
d7fe1a67 DW |
59 | } |
60 | static DEVICE_ATTR_RO(align); | |
61 | ||
62 | static struct attribute *dax_region_attributes[] = { | |
63 | &dev_attr_region_size.attr, | |
64 | &dev_attr_align.attr, | |
65 | &dev_attr_id.attr, | |
66 | NULL, | |
67 | }; | |
68 | ||
69 | static const struct attribute_group dax_region_attribute_group = { | |
70 | .name = "dax_region", | |
71 | .attrs = dax_region_attributes, | |
72 | }; | |
73 | ||
74 | static const struct attribute_group *dax_region_attribute_groups[] = { | |
75 | &dax_region_attribute_group, | |
76 | NULL, | |
77 | }; | |
78 | ||
ab68f262 DW |
79 | static void dax_region_free(struct kref *kref) |
80 | { | |
81 | struct dax_region *dax_region; | |
82 | ||
83 | dax_region = container_of(kref, struct dax_region, kref); | |
84 | kfree(dax_region); | |
85 | } | |
86 | ||
87 | void dax_region_put(struct dax_region *dax_region) | |
ab68f262 | 88 | { |
ab68f262 | 89 | kref_put(&dax_region->kref, dax_region_free); |
ab68f262 | 90 | } |
ab68f262 | 91 | EXPORT_SYMBOL_GPL(dax_region_put); |
ab68f262 | 92 | |
d7fe1a67 DW |
93 | static void dax_region_unregister(void *region) |
94 | { | |
95 | struct dax_region *dax_region = region; | |
96 | ||
97 | sysfs_remove_groups(&dax_region->dev->kobj, | |
98 | dax_region_attribute_groups); | |
99 | dax_region_put(dax_region); | |
100 | } | |
101 | ||
ab68f262 DW |
102 | struct dax_region *alloc_dax_region(struct device *parent, int region_id, |
103 | struct resource *res, unsigned int align, void *addr, | |
104 | unsigned long pfn_flags) | |
105 | { | |
106 | struct dax_region *dax_region; | |
107 | ||
d7fe1a67 DW |
108 | /* |
109 | * The DAX core assumes that it can store its private data in | |
110 | * parent->driver_data. This WARN is a reminder / safeguard for | |
111 | * developers of device-dax drivers. | |
112 | */ | |
113 | if (dev_get_drvdata(parent)) { | |
114 | dev_WARN(parent, "dax core failed to setup private data\n"); | |
115 | return NULL; | |
116 | } | |
117 | ||
9d2d01a0 DW |
118 | if (!IS_ALIGNED(res->start, align) |
119 | || !IS_ALIGNED(resource_size(res), align)) | |
120 | return NULL; | |
ab68f262 | 121 | |
9d2d01a0 | 122 | dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); |
ab68f262 DW |
123 | if (!dax_region) |
124 | return NULL; | |
125 | ||
d7fe1a67 | 126 | dev_set_drvdata(parent, dax_region); |
ab68f262 DW |
127 | memcpy(&dax_region->res, res, sizeof(*res)); |
128 | dax_region->pfn_flags = pfn_flags; | |
129 | kref_init(&dax_region->kref); | |
130 | dax_region->id = region_id; | |
131 | ida_init(&dax_region->ida); | |
132 | dax_region->align = align; | |
133 | dax_region->dev = parent; | |
134 | dax_region->base = addr; | |
d7fe1a67 DW |
135 | if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) { |
136 | kfree(dax_region); | |
1c47a645 | 137 | return NULL; |
d7fe1a67 | 138 | } |
ab68f262 | 139 | |
d7fe1a67 DW |
140 | kref_get(&dax_region->kref); |
141 | if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region)) | |
142 | return NULL; | |
ab68f262 DW |
143 | return dax_region; |
144 | } | |
145 | EXPORT_SYMBOL_GPL(alloc_dax_region); | |
146 | ||
5f0694b3 | 147 | static struct dev_dax *to_dev_dax(struct device *dev) |
ebd84d72 | 148 | { |
5f0694b3 | 149 | return container_of(dev, struct dev_dax, dev); |
ebd84d72 DW |
150 | } |
151 | ||
ab68f262 DW |
152 | static ssize_t size_show(struct device *dev, |
153 | struct device_attribute *attr, char *buf) | |
154 | { | |
5f0694b3 | 155 | struct dev_dax *dev_dax = to_dev_dax(dev); |
ab68f262 DW |
156 | unsigned long long size = 0; |
157 | int i; | |
158 | ||
5f0694b3 DW |
159 | for (i = 0; i < dev_dax->num_resources; i++) |
160 | size += resource_size(&dev_dax->res[i]); | |
ab68f262 DW |
161 | |
162 | return sprintf(buf, "%llu\n", size); | |
163 | } | |
164 | static DEVICE_ATTR_RO(size); | |
165 | ||
5f0694b3 | 166 | static struct attribute *dev_dax_attributes[] = { |
ab68f262 DW |
167 | &dev_attr_size.attr, |
168 | NULL, | |
169 | }; | |
170 | ||
5f0694b3 DW |
171 | static const struct attribute_group dev_dax_attribute_group = { |
172 | .attrs = dev_dax_attributes, | |
ab68f262 DW |
173 | }; |
174 | ||
175 | static const struct attribute_group *dax_attribute_groups[] = { | |
5f0694b3 | 176 | &dev_dax_attribute_group, |
ab68f262 DW |
177 | NULL, |
178 | }; | |
179 | ||
5f0694b3 | 180 | static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, |
dee41079 DW |
181 | const char *func) |
182 | { | |
5f0694b3 DW |
183 | struct dax_region *dax_region = dev_dax->region; |
184 | struct device *dev = &dev_dax->dev; | |
dee41079 DW |
185 | unsigned long mask; |
186 | ||
7b6be844 | 187 | if (!dax_alive(dev_dax->dax_dev)) |
dee41079 DW |
188 | return -ENXIO; |
189 | ||
4cb19355 | 190 | /* prevent private mappings from being established */ |
325896ff | 191 | if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) { |
dee41079 DW |
192 | dev_info(dev, "%s: %s: fail, attempted private mapping\n", |
193 | current->comm, func); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | mask = dax_region->align - 1; | |
198 | if (vma->vm_start & mask || vma->vm_end & mask) { | |
199 | dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n", | |
200 | current->comm, func, vma->vm_start, vma->vm_end, | |
201 | mask); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV | |
206 | && (vma->vm_flags & VM_DONTCOPY) == 0) { | |
207 | dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n", | |
208 | current->comm, func); | |
209 | return -EINVAL; | |
210 | } | |
211 | ||
212 | if (!vma_is_dax(vma)) { | |
213 | dev_info(dev, "%s: %s: fail, vma is not DAX capable\n", | |
214 | current->comm, func); | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
efebc711 | 221 | /* see "strong" declaration in tools/testing/nvdimm/dax-dev.c */ |
73616367 | 222 | __weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, |
dee41079 DW |
223 | unsigned long size) |
224 | { | |
225 | struct resource *res; | |
0a3ff786 RZ |
226 | /* gcc-4.6.3-nolibc for i386 complains that this is uninitialized */ |
227 | phys_addr_t uninitialized_var(phys); | |
dee41079 DW |
228 | int i; |
229 | ||
5f0694b3 DW |
230 | for (i = 0; i < dev_dax->num_resources; i++) { |
231 | res = &dev_dax->res[i]; | |
dee41079 DW |
232 | phys = pgoff * PAGE_SIZE + res->start; |
233 | if (phys >= res->start && phys <= res->end) | |
234 | break; | |
235 | pgoff -= PHYS_PFN(resource_size(res)); | |
236 | } | |
237 | ||
5f0694b3 DW |
238 | if (i < dev_dax->num_resources) { |
239 | res = &dev_dax->res[i]; | |
dee41079 DW |
240 | if (phys + size - 1 <= res->end) |
241 | return phys; | |
242 | } | |
243 | ||
244 | return -1; | |
245 | } | |
246 | ||
226ab561 DW |
247 | static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax, |
248 | struct vm_fault *vmf) | |
dee41079 | 249 | { |
5f0694b3 | 250 | struct device *dev = &dev_dax->dev; |
dee41079 | 251 | struct dax_region *dax_region; |
dee41079 DW |
252 | phys_addr_t phys; |
253 | pfn_t pfn; | |
0134ed4f | 254 | unsigned int fault_size = PAGE_SIZE; |
dee41079 | 255 | |
5f0694b3 | 256 | if (check_vma(dev_dax, vmf->vma, __func__)) |
dee41079 DW |
257 | return VM_FAULT_SIGBUS; |
258 | ||
5f0694b3 | 259 | dax_region = dev_dax->region; |
dee41079 | 260 | if (dax_region->align > PAGE_SIZE) { |
6daaca52 DW |
261 | dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n", |
262 | dax_region->align, fault_size); | |
dee41079 DW |
263 | return VM_FAULT_SIGBUS; |
264 | } | |
265 | ||
0134ed4f DJ |
266 | if (fault_size != dax_region->align) |
267 | return VM_FAULT_SIGBUS; | |
268 | ||
73616367 | 269 | phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE); |
dee41079 | 270 | if (phys == -1) { |
6daaca52 | 271 | dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", vmf->pgoff); |
dee41079 DW |
272 | return VM_FAULT_SIGBUS; |
273 | } | |
274 | ||
275 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
276 | ||
226ab561 | 277 | return vmf_insert_mixed(vmf->vma, vmf->address, pfn); |
dee41079 DW |
278 | } |
279 | ||
226ab561 DW |
280 | static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, |
281 | struct vm_fault *vmf) | |
dee41079 | 282 | { |
d8a849e1 | 283 | unsigned long pmd_addr = vmf->address & PMD_MASK; |
5f0694b3 | 284 | struct device *dev = &dev_dax->dev; |
dee41079 DW |
285 | struct dax_region *dax_region; |
286 | phys_addr_t phys; | |
287 | pgoff_t pgoff; | |
288 | pfn_t pfn; | |
0134ed4f | 289 | unsigned int fault_size = PMD_SIZE; |
dee41079 | 290 | |
5f0694b3 | 291 | if (check_vma(dev_dax, vmf->vma, __func__)) |
dee41079 DW |
292 | return VM_FAULT_SIGBUS; |
293 | ||
5f0694b3 | 294 | dax_region = dev_dax->region; |
dee41079 | 295 | if (dax_region->align > PMD_SIZE) { |
6daaca52 DW |
296 | dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n", |
297 | dax_region->align, fault_size); | |
dee41079 DW |
298 | return VM_FAULT_SIGBUS; |
299 | } | |
300 | ||
301 | /* dax pmd mappings require pfn_t_devmap() */ | |
302 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { | |
6daaca52 | 303 | dev_dbg(dev, "region lacks devmap flags\n"); |
dee41079 DW |
304 | return VM_FAULT_SIGBUS; |
305 | } | |
306 | ||
0134ed4f DJ |
307 | if (fault_size < dax_region->align) |
308 | return VM_FAULT_SIGBUS; | |
309 | else if (fault_size > dax_region->align) | |
310 | return VM_FAULT_FALLBACK; | |
311 | ||
312 | /* if we are outside of the VMA */ | |
313 | if (pmd_addr < vmf->vma->vm_start || | |
314 | (pmd_addr + PMD_SIZE) > vmf->vma->vm_end) | |
315 | return VM_FAULT_SIGBUS; | |
316 | ||
f4200391 | 317 | pgoff = linear_page_index(vmf->vma, pmd_addr); |
73616367 | 318 | phys = dax_pgoff_to_phys(dev_dax, pgoff, PMD_SIZE); |
dee41079 | 319 | if (phys == -1) { |
6daaca52 | 320 | dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff); |
dee41079 DW |
321 | return VM_FAULT_SIGBUS; |
322 | } | |
323 | ||
324 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
325 | ||
f4200391 | 326 | return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd, pfn, |
d8a849e1 | 327 | vmf->flags & FAULT_FLAG_WRITE); |
dee41079 DW |
328 | } |
329 | ||
9557feee | 330 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
226ab561 DW |
331 | static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, |
332 | struct vm_fault *vmf) | |
9557feee DJ |
333 | { |
334 | unsigned long pud_addr = vmf->address & PUD_MASK; | |
5f0694b3 | 335 | struct device *dev = &dev_dax->dev; |
9557feee DJ |
336 | struct dax_region *dax_region; |
337 | phys_addr_t phys; | |
338 | pgoff_t pgoff; | |
339 | pfn_t pfn; | |
70b085b0 DJ |
340 | unsigned int fault_size = PUD_SIZE; |
341 | ||
9557feee | 342 | |
5f0694b3 | 343 | if (check_vma(dev_dax, vmf->vma, __func__)) |
9557feee DJ |
344 | return VM_FAULT_SIGBUS; |
345 | ||
5f0694b3 | 346 | dax_region = dev_dax->region; |
9557feee | 347 | if (dax_region->align > PUD_SIZE) { |
6daaca52 DW |
348 | dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n", |
349 | dax_region->align, fault_size); | |
9557feee DJ |
350 | return VM_FAULT_SIGBUS; |
351 | } | |
352 | ||
353 | /* dax pud mappings require pfn_t_devmap() */ | |
354 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { | |
6daaca52 | 355 | dev_dbg(dev, "region lacks devmap flags\n"); |
9557feee DJ |
356 | return VM_FAULT_SIGBUS; |
357 | } | |
358 | ||
70b085b0 DJ |
359 | if (fault_size < dax_region->align) |
360 | return VM_FAULT_SIGBUS; | |
361 | else if (fault_size > dax_region->align) | |
362 | return VM_FAULT_FALLBACK; | |
363 | ||
364 | /* if we are outside of the VMA */ | |
365 | if (pud_addr < vmf->vma->vm_start || | |
366 | (pud_addr + PUD_SIZE) > vmf->vma->vm_end) | |
367 | return VM_FAULT_SIGBUS; | |
368 | ||
9557feee | 369 | pgoff = linear_page_index(vmf->vma, pud_addr); |
73616367 | 370 | phys = dax_pgoff_to_phys(dev_dax, pgoff, PUD_SIZE); |
9557feee | 371 | if (phys == -1) { |
6daaca52 | 372 | dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff); |
9557feee DJ |
373 | return VM_FAULT_SIGBUS; |
374 | } | |
375 | ||
376 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
377 | ||
378 | return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn, | |
379 | vmf->flags & FAULT_FLAG_WRITE); | |
380 | } | |
381 | #else | |
226ab561 DW |
382 | static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, |
383 | struct vm_fault *vmf) | |
9557feee DJ |
384 | { |
385 | return VM_FAULT_FALLBACK; | |
386 | } | |
387 | #endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
388 | ||
226ab561 | 389 | static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, |
c791ace1 | 390 | enum page_entry_size pe_size) |
dee41079 | 391 | { |
956a4cd2 | 392 | int rc, id; |
f4200391 | 393 | struct file *filp = vmf->vma->vm_file; |
5f0694b3 | 394 | struct dev_dax *dev_dax = filp->private_data; |
dee41079 | 395 | |
6daaca52 DW |
396 | dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm, |
397 | (vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read", | |
76202620 | 398 | vmf->vma->vm_start, vmf->vma->vm_end, pe_size); |
dee41079 | 399 | |
7b6be844 | 400 | id = dax_read_lock(); |
c791ace1 DJ |
401 | switch (pe_size) { |
402 | case PE_SIZE_PTE: | |
5f0694b3 | 403 | rc = __dev_dax_pte_fault(dev_dax, vmf); |
a2d58167 | 404 | break; |
c791ace1 | 405 | case PE_SIZE_PMD: |
5f0694b3 | 406 | rc = __dev_dax_pmd_fault(dev_dax, vmf); |
9557feee | 407 | break; |
c791ace1 | 408 | case PE_SIZE_PUD: |
5f0694b3 | 409 | rc = __dev_dax_pud_fault(dev_dax, vmf); |
a2d58167 DJ |
410 | break; |
411 | default: | |
54eafcc9 | 412 | rc = VM_FAULT_SIGBUS; |
a2d58167 | 413 | } |
7b6be844 | 414 | dax_read_unlock(id); |
dee41079 DW |
415 | |
416 | return rc; | |
417 | } | |
418 | ||
226ab561 | 419 | static vm_fault_t dev_dax_fault(struct vm_fault *vmf) |
c791ace1 | 420 | { |
5f0694b3 | 421 | return dev_dax_huge_fault(vmf, PE_SIZE_PTE); |
c791ace1 DJ |
422 | } |
423 | ||
9702cffd DW |
424 | static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr) |
425 | { | |
426 | struct file *filp = vma->vm_file; | |
427 | struct dev_dax *dev_dax = filp->private_data; | |
428 | struct dax_region *dax_region = dev_dax->region; | |
429 | ||
430 | if (!IS_ALIGNED(addr, dax_region->align)) | |
431 | return -EINVAL; | |
432 | return 0; | |
433 | } | |
434 | ||
c1d53b92 DW |
435 | static unsigned long dev_dax_pagesize(struct vm_area_struct *vma) |
436 | { | |
437 | struct file *filp = vma->vm_file; | |
438 | struct dev_dax *dev_dax = filp->private_data; | |
439 | struct dax_region *dax_region = dev_dax->region; | |
440 | ||
441 | return dax_region->align; | |
442 | } | |
443 | ||
5f0694b3 DW |
444 | static const struct vm_operations_struct dax_vm_ops = { |
445 | .fault = dev_dax_fault, | |
446 | .huge_fault = dev_dax_huge_fault, | |
9702cffd | 447 | .split = dev_dax_split, |
c1d53b92 | 448 | .pagesize = dev_dax_pagesize, |
dee41079 DW |
449 | }; |
450 | ||
af69f51e | 451 | static int dax_mmap(struct file *filp, struct vm_area_struct *vma) |
dee41079 | 452 | { |
5f0694b3 | 453 | struct dev_dax *dev_dax = filp->private_data; |
7b6be844 | 454 | int rc, id; |
dee41079 | 455 | |
6daaca52 | 456 | dev_dbg(&dev_dax->dev, "trace\n"); |
dee41079 | 457 | |
7b6be844 DW |
458 | /* |
459 | * We lock to check dax_dev liveness and will re-check at | |
460 | * fault time. | |
461 | */ | |
462 | id = dax_read_lock(); | |
5f0694b3 | 463 | rc = check_vma(dev_dax, vma, __func__); |
7b6be844 | 464 | dax_read_unlock(id); |
dee41079 DW |
465 | if (rc) |
466 | return rc; | |
467 | ||
5f0694b3 | 468 | vma->vm_ops = &dax_vm_ops; |
dee41079 DW |
469 | vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; |
470 | return 0; | |
043a9255 DW |
471 | } |
472 | ||
473 | /* return an unmapped area aligned to the dax region specified alignment */ | |
af69f51e | 474 | static unsigned long dax_get_unmapped_area(struct file *filp, |
043a9255 DW |
475 | unsigned long addr, unsigned long len, unsigned long pgoff, |
476 | unsigned long flags) | |
477 | { | |
478 | unsigned long off, off_end, off_align, len_align, addr_align, align; | |
5f0694b3 | 479 | struct dev_dax *dev_dax = filp ? filp->private_data : NULL; |
043a9255 DW |
480 | struct dax_region *dax_region; |
481 | ||
5f0694b3 | 482 | if (!dev_dax || addr) |
043a9255 DW |
483 | goto out; |
484 | ||
5f0694b3 | 485 | dax_region = dev_dax->region; |
043a9255 DW |
486 | align = dax_region->align; |
487 | off = pgoff << PAGE_SHIFT; | |
488 | off_end = off + len; | |
489 | off_align = round_up(off, align); | |
490 | ||
491 | if ((off_end <= off_align) || ((off_end - off_align) < align)) | |
492 | goto out; | |
493 | ||
494 | len_align = len + align; | |
495 | if ((off + len_align) < off) | |
496 | goto out; | |
dee41079 | 497 | |
043a9255 DW |
498 | addr_align = current->mm->get_unmapped_area(filp, addr, len_align, |
499 | pgoff, flags); | |
500 | if (!IS_ERR_VALUE(addr_align)) { | |
501 | addr_align += (off - addr_align) & (align - 1); | |
502 | return addr_align; | |
503 | } | |
504 | out: | |
505 | return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags); | |
506 | } | |
507 | ||
af69f51e | 508 | static int dax_open(struct inode *inode, struct file *filp) |
043a9255 | 509 | { |
7b6be844 DW |
510 | struct dax_device *dax_dev = inode_dax(inode); |
511 | struct inode *__dax_inode = dax_inode(dax_dev); | |
512 | struct dev_dax *dev_dax = dax_get_private(dax_dev); | |
043a9255 | 513 | |
6daaca52 | 514 | dev_dbg(&dev_dax->dev, "trace\n"); |
7b6be844 DW |
515 | inode->i_mapping = __dax_inode->i_mapping; |
516 | inode->i_mapping->host = __dax_inode; | |
3bc52c45 | 517 | filp->f_mapping = inode->i_mapping; |
5660e13d | 518 | filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); |
5f0694b3 | 519 | filp->private_data = dev_dax; |
ebd84d72 | 520 | inode->i_flags = S_DAX; |
043a9255 | 521 | |
043a9255 DW |
522 | return 0; |
523 | } | |
dee41079 | 524 | |
af69f51e | 525 | static int dax_release(struct inode *inode, struct file *filp) |
043a9255 | 526 | { |
5f0694b3 | 527 | struct dev_dax *dev_dax = filp->private_data; |
043a9255 | 528 | |
6daaca52 | 529 | dev_dbg(&dev_dax->dev, "trace\n"); |
043a9255 | 530 | return 0; |
dee41079 DW |
531 | } |
532 | ||
ab68f262 DW |
533 | static const struct file_operations dax_fops = { |
534 | .llseek = noop_llseek, | |
535 | .owner = THIS_MODULE, | |
af69f51e DW |
536 | .open = dax_open, |
537 | .release = dax_release, | |
538 | .get_unmapped_area = dax_get_unmapped_area, | |
539 | .mmap = dax_mmap, | |
ef842302 | 540 | .mmap_supported_flags = MAP_SYNC, |
ab68f262 DW |
541 | }; |
542 | ||
5f0694b3 | 543 | static void dev_dax_release(struct device *dev) |
043a9255 | 544 | { |
5f0694b3 DW |
545 | struct dev_dax *dev_dax = to_dev_dax(dev); |
546 | struct dax_region *dax_region = dev_dax->region; | |
7b6be844 | 547 | struct dax_device *dax_dev = dev_dax->dax_dev; |
043a9255 | 548 | |
bbb3be17 DW |
549 | if (dev_dax->id >= 0) |
550 | ida_simple_remove(&dax_region->ida, dev_dax->id); | |
ebd84d72 | 551 | dax_region_put(dax_region); |
7b6be844 | 552 | put_dax(dax_dev); |
5f0694b3 | 553 | kfree(dev_dax); |
ebd84d72 DW |
554 | } |
555 | ||
5f0694b3 | 556 | static void kill_dev_dax(struct dev_dax *dev_dax) |
ebd84d72 | 557 | { |
7b6be844 DW |
558 | struct dax_device *dax_dev = dev_dax->dax_dev; |
559 | struct inode *inode = dax_inode(dax_dev); | |
560 | ||
561 | kill_dax(dax_dev); | |
562 | unmap_mapping_range(inode->i_mapping, 0, 0, 1); | |
ebd84d72 DW |
563 | } |
564 | ||
5f0694b3 | 565 | static void unregister_dev_dax(void *dev) |
ebd84d72 | 566 | { |
5f0694b3 | 567 | struct dev_dax *dev_dax = to_dev_dax(dev); |
7b6be844 DW |
568 | struct dax_device *dax_dev = dev_dax->dax_dev; |
569 | struct inode *inode = dax_inode(dax_dev); | |
570 | struct cdev *cdev = inode->i_cdev; | |
ebd84d72 | 571 | |
6daaca52 | 572 | dev_dbg(dev, "trace\n"); |
043a9255 | 573 | |
5f0694b3 | 574 | kill_dev_dax(dev_dax); |
7b6be844 | 575 | cdev_device_del(cdev, dev); |
92a3fa07 | 576 | put_device(dev); |
043a9255 DW |
577 | } |
578 | ||
5f0694b3 | 579 | struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, |
bbb3be17 | 580 | int id, struct resource *res, int count) |
043a9255 DW |
581 | { |
582 | struct device *parent = dax_region->dev; | |
7b6be844 | 583 | struct dax_device *dax_dev; |
5f0694b3 | 584 | struct dev_dax *dev_dax; |
7b6be844 | 585 | struct inode *inode; |
043a9255 | 586 | struct device *dev; |
ba09c01d | 587 | struct cdev *cdev; |
43fe51e1 DW |
588 | int rc, i; |
589 | ||
590 | if (!count) | |
591 | return ERR_PTR(-EINVAL); | |
043a9255 | 592 | |
acafe7e3 | 593 | dev_dax = kzalloc(struct_size(dev_dax, res, count), GFP_KERNEL); |
5f0694b3 | 594 | if (!dev_dax) |
d76911ee | 595 | return ERR_PTR(-ENOMEM); |
043a9255 | 596 | |
9d2d01a0 DW |
597 | for (i = 0; i < count; i++) { |
598 | if (!IS_ALIGNED(res[i].start, dax_region->align) | |
599 | || !IS_ALIGNED(resource_size(&res[i]), | |
600 | dax_region->align)) { | |
601 | rc = -EINVAL; | |
602 | break; | |
603 | } | |
5f0694b3 DW |
604 | dev_dax->res[i].start = res[i].start; |
605 | dev_dax->res[i].end = res[i].end; | |
9d2d01a0 DW |
606 | } |
607 | ||
608 | if (i < count) | |
609 | goto err_id; | |
610 | ||
bbb3be17 DW |
611 | if (id < 0) { |
612 | id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL); | |
613 | dev_dax->id = id; | |
614 | if (id < 0) { | |
615 | rc = id; | |
616 | goto err_id; | |
617 | } | |
618 | } else { | |
619 | /* region provider owns @id lifetime */ | |
620 | dev_dax->id = -1; | |
043a9255 DW |
621 | } |
622 | ||
6568b08b DW |
623 | /* |
624 | * No 'host' or dax_operations since there is no access to this | |
625 | * device outside of mmap of the resulting character device. | |
626 | */ | |
627 | dax_dev = alloc_dax(dev_dax, NULL, NULL); | |
43fe51e1 DW |
628 | if (!dax_dev) { |
629 | rc = -ENOMEM; | |
7b6be844 | 630 | goto err_dax; |
43fe51e1 | 631 | } |
3bc52c45 | 632 | |
7b6be844 | 633 | /* from here on we're committed to teardown via dax_dev_release() */ |
5f0694b3 | 634 | dev = &dev_dax->dev; |
ebd84d72 | 635 | device_initialize(dev); |
ba09c01d | 636 | |
7b6be844 DW |
637 | inode = dax_inode(dax_dev); |
638 | cdev = inode->i_cdev; | |
ba09c01d DW |
639 | cdev_init(cdev, &dax_fops); |
640 | cdev->owner = parent->driver->owner; | |
ba09c01d | 641 | |
5f0694b3 | 642 | dev_dax->num_resources = count; |
7b6be844 | 643 | dev_dax->dax_dev = dax_dev; |
5f0694b3 | 644 | dev_dax->region = dax_region; |
ba09c01d DW |
645 | kref_get(&dax_region->kref); |
646 | ||
7b6be844 | 647 | dev->devt = inode->i_rdev; |
ebd84d72 DW |
648 | dev->class = dax_class; |
649 | dev->parent = parent; | |
650 | dev->groups = dax_attribute_groups; | |
5f0694b3 | 651 | dev->release = dev_dax_release; |
bbb3be17 | 652 | dev_set_name(dev, "dax%d.%d", dax_region->id, id); |
92a3fa07 LG |
653 | |
654 | rc = cdev_device_add(cdev, dev); | |
ebd84d72 | 655 | if (rc) { |
5f0694b3 | 656 | kill_dev_dax(dev_dax); |
ebd84d72 | 657 | put_device(dev); |
d76911ee | 658 | return ERR_PTR(rc); |
ebd84d72 | 659 | } |
043a9255 | 660 | |
5f0694b3 | 661 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev); |
d76911ee DW |
662 | if (rc) |
663 | return ERR_PTR(rc); | |
664 | ||
5f0694b3 | 665 | return dev_dax; |
043a9255 | 666 | |
7b6be844 | 667 | err_dax: |
bbb3be17 DW |
668 | if (dev_dax->id >= 0) |
669 | ida_simple_remove(&dax_region->ida, dev_dax->id); | |
043a9255 | 670 | err_id: |
5f0694b3 | 671 | kfree(dev_dax); |
043a9255 | 672 | |
d76911ee | 673 | return ERR_PTR(rc); |
043a9255 | 674 | } |
5f0694b3 | 675 | EXPORT_SYMBOL_GPL(devm_create_dev_dax); |
043a9255 | 676 | |
ab68f262 DW |
677 | static int __init dax_init(void) |
678 | { | |
ab68f262 | 679 | dax_class = class_create(THIS_MODULE, "dax"); |
7b6be844 | 680 | return PTR_ERR_OR_ZERO(dax_class); |
ab68f262 DW |
681 | } |
682 | ||
683 | static void __exit dax_exit(void) | |
684 | { | |
685 | class_destroy(dax_class); | |
ab68f262 DW |
686 | } |
687 | ||
688 | MODULE_AUTHOR("Intel Corporation"); | |
689 | MODULE_LICENSE("GPL v2"); | |
690 | subsys_initcall(dax_init); | |
691 | module_exit(dax_exit); |