Commit | Line | Data |
---|---|---|
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> | |
efebc711 | 22 | #include "dax-private.h" |
ccdb07f6 | 23 | #include "dax.h" |
ab68f262 | 24 | |
ab68f262 | 25 | static struct class *dax_class; |
ab68f262 | 26 | |
565851c9 DW |
27 | /* |
28 | * Rely on the fact that drvdata is set before the attributes are | |
29 | * registered, and that the attributes are unregistered before drvdata | |
30 | * is cleared to assume that drvdata is always valid. | |
31 | */ | |
d7fe1a67 DW |
32 | static ssize_t id_show(struct device *dev, |
33 | struct device_attribute *attr, char *buf) | |
34 | { | |
565851c9 | 35 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 36 | |
565851c9 | 37 | return sprintf(buf, "%d\n", dax_region->id); |
d7fe1a67 DW |
38 | } |
39 | static DEVICE_ATTR_RO(id); | |
40 | ||
41 | static ssize_t region_size_show(struct device *dev, | |
42 | struct device_attribute *attr, char *buf) | |
43 | { | |
565851c9 | 44 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 45 | |
565851c9 DW |
46 | return sprintf(buf, "%llu\n", (unsigned long long) |
47 | resource_size(&dax_region->res)); | |
d7fe1a67 DW |
48 | } |
49 | static struct device_attribute dev_attr_region_size = __ATTR(size, 0444, | |
50 | region_size_show, NULL); | |
51 | ||
52 | static ssize_t align_show(struct device *dev, | |
53 | struct device_attribute *attr, char *buf) | |
54 | { | |
565851c9 | 55 | struct dax_region *dax_region = dev_get_drvdata(dev); |
d7fe1a67 | 56 | |
565851c9 | 57 | return sprintf(buf, "%u\n", dax_region->align); |
d7fe1a67 DW |
58 | } |
59 | static DEVICE_ATTR_RO(align); | |
60 | ||
61 | static struct attribute *dax_region_attributes[] = { | |
62 | &dev_attr_region_size.attr, | |
63 | &dev_attr_align.attr, | |
64 | &dev_attr_id.attr, | |
65 | NULL, | |
66 | }; | |
67 | ||
68 | static const struct attribute_group dax_region_attribute_group = { | |
69 | .name = "dax_region", | |
70 | .attrs = dax_region_attributes, | |
71 | }; | |
72 | ||
73 | static const struct attribute_group *dax_region_attribute_groups[] = { | |
74 | &dax_region_attribute_group, | |
75 | NULL, | |
76 | }; | |
77 | ||
ab68f262 DW |
78 | static void dax_region_free(struct kref *kref) |
79 | { | |
80 | struct dax_region *dax_region; | |
81 | ||
82 | dax_region = container_of(kref, struct dax_region, kref); | |
83 | kfree(dax_region); | |
84 | } | |
85 | ||
86 | void dax_region_put(struct dax_region *dax_region) | |
ab68f262 | 87 | { |
ab68f262 | 88 | kref_put(&dax_region->kref, dax_region_free); |
ab68f262 | 89 | } |
ab68f262 | 90 | EXPORT_SYMBOL_GPL(dax_region_put); |
ab68f262 | 91 | |
d7fe1a67 DW |
92 | static void dax_region_unregister(void *region) |
93 | { | |
94 | struct dax_region *dax_region = region; | |
95 | ||
96 | sysfs_remove_groups(&dax_region->dev->kobj, | |
97 | dax_region_attribute_groups); | |
98 | dax_region_put(dax_region); | |
99 | } | |
100 | ||
ab68f262 DW |
101 | struct dax_region *alloc_dax_region(struct device *parent, int region_id, |
102 | struct resource *res, unsigned int align, void *addr, | |
103 | unsigned long pfn_flags) | |
104 | { | |
105 | struct dax_region *dax_region; | |
106 | ||
d7fe1a67 DW |
107 | /* |
108 | * The DAX core assumes that it can store its private data in | |
109 | * parent->driver_data. This WARN is a reminder / safeguard for | |
110 | * developers of device-dax drivers. | |
111 | */ | |
112 | if (dev_get_drvdata(parent)) { | |
113 | dev_WARN(parent, "dax core failed to setup private data\n"); | |
114 | return NULL; | |
115 | } | |
116 | ||
9d2d01a0 DW |
117 | if (!IS_ALIGNED(res->start, align) |
118 | || !IS_ALIGNED(resource_size(res), align)) | |
119 | return NULL; | |
ab68f262 | 120 | |
9d2d01a0 | 121 | dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); |
ab68f262 DW |
122 | if (!dax_region) |
123 | return NULL; | |
124 | ||
d7fe1a67 | 125 | dev_set_drvdata(parent, dax_region); |
ab68f262 DW |
126 | memcpy(&dax_region->res, res, sizeof(*res)); |
127 | dax_region->pfn_flags = pfn_flags; | |
128 | kref_init(&dax_region->kref); | |
129 | dax_region->id = region_id; | |
130 | ida_init(&dax_region->ida); | |
131 | dax_region->align = align; | |
132 | dax_region->dev = parent; | |
133 | dax_region->base = addr; | |
d7fe1a67 DW |
134 | if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) { |
135 | kfree(dax_region); | |
136 | return NULL;; | |
137 | } | |
ab68f262 | 138 | |
d7fe1a67 DW |
139 | kref_get(&dax_region->kref); |
140 | if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region)) | |
141 | return NULL; | |
ab68f262 DW |
142 | return dax_region; |
143 | } | |
144 | EXPORT_SYMBOL_GPL(alloc_dax_region); | |
145 | ||
5f0694b3 | 146 | static struct dev_dax *to_dev_dax(struct device *dev) |
ebd84d72 | 147 | { |
5f0694b3 | 148 | return container_of(dev, struct dev_dax, dev); |
ebd84d72 DW |
149 | } |
150 | ||
ab68f262 DW |
151 | static ssize_t size_show(struct device *dev, |
152 | struct device_attribute *attr, char *buf) | |
153 | { | |
5f0694b3 | 154 | struct dev_dax *dev_dax = to_dev_dax(dev); |
ab68f262 DW |
155 | unsigned long long size = 0; |
156 | int i; | |
157 | ||
5f0694b3 DW |
158 | for (i = 0; i < dev_dax->num_resources; i++) |
159 | size += resource_size(&dev_dax->res[i]); | |
ab68f262 DW |
160 | |
161 | return sprintf(buf, "%llu\n", size); | |
162 | } | |
163 | static DEVICE_ATTR_RO(size); | |
164 | ||
5f0694b3 | 165 | static struct attribute *dev_dax_attributes[] = { |
ab68f262 DW |
166 | &dev_attr_size.attr, |
167 | NULL, | |
168 | }; | |
169 | ||
5f0694b3 DW |
170 | static const struct attribute_group dev_dax_attribute_group = { |
171 | .attrs = dev_dax_attributes, | |
ab68f262 DW |
172 | }; |
173 | ||
174 | static const struct attribute_group *dax_attribute_groups[] = { | |
5f0694b3 | 175 | &dev_dax_attribute_group, |
ab68f262 DW |
176 | NULL, |
177 | }; | |
178 | ||
5f0694b3 | 179 | static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, |
dee41079 DW |
180 | const char *func) |
181 | { | |
5f0694b3 DW |
182 | struct dax_region *dax_region = dev_dax->region; |
183 | struct device *dev = &dev_dax->dev; | |
dee41079 DW |
184 | unsigned long mask; |
185 | ||
7b6be844 | 186 | if (!dax_alive(dev_dax->dax_dev)) |
dee41079 DW |
187 | return -ENXIO; |
188 | ||
4cb19355 | 189 | /* prevent private mappings from being established */ |
325896ff | 190 | if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) { |
dee41079 DW |
191 | dev_info(dev, "%s: %s: fail, attempted private mapping\n", |
192 | current->comm, func); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | mask = dax_region->align - 1; | |
197 | if (vma->vm_start & mask || vma->vm_end & mask) { | |
198 | dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n", | |
199 | current->comm, func, vma->vm_start, vma->vm_end, | |
200 | mask); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV | |
205 | && (vma->vm_flags & VM_DONTCOPY) == 0) { | |
206 | dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n", | |
207 | current->comm, func); | |
208 | return -EINVAL; | |
209 | } | |
210 | ||
211 | if (!vma_is_dax(vma)) { | |
212 | dev_info(dev, "%s: %s: fail, vma is not DAX capable\n", | |
213 | current->comm, func); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
efebc711 | 220 | /* see "strong" declaration in tools/testing/nvdimm/dax-dev.c */ |
73616367 | 221 | __weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, |
dee41079 DW |
222 | unsigned long size) |
223 | { | |
224 | struct resource *res; | |
225 | phys_addr_t phys; | |
226 | int i; | |
227 | ||
5f0694b3 DW |
228 | for (i = 0; i < dev_dax->num_resources; i++) { |
229 | res = &dev_dax->res[i]; | |
dee41079 DW |
230 | phys = pgoff * PAGE_SIZE + res->start; |
231 | if (phys >= res->start && phys <= res->end) | |
232 | break; | |
233 | pgoff -= PHYS_PFN(resource_size(res)); | |
234 | } | |
235 | ||
5f0694b3 DW |
236 | if (i < dev_dax->num_resources) { |
237 | res = &dev_dax->res[i]; | |
dee41079 DW |
238 | if (phys + size - 1 <= res->end) |
239 | return phys; | |
240 | } | |
241 | ||
242 | return -1; | |
243 | } | |
244 | ||
5f0694b3 | 245 | static int __dev_dax_pte_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) |
dee41079 | 246 | { |
5f0694b3 | 247 | struct device *dev = &dev_dax->dev; |
dee41079 DW |
248 | struct dax_region *dax_region; |
249 | int rc = VM_FAULT_SIGBUS; | |
250 | phys_addr_t phys; | |
251 | pfn_t pfn; | |
0134ed4f | 252 | unsigned int fault_size = PAGE_SIZE; |
dee41079 | 253 | |
5f0694b3 | 254 | if (check_vma(dev_dax, vmf->vma, __func__)) |
dee41079 DW |
255 | return VM_FAULT_SIGBUS; |
256 | ||
5f0694b3 | 257 | dax_region = dev_dax->region; |
dee41079 | 258 | if (dax_region->align > PAGE_SIZE) { |
76202620 OH |
259 | dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", |
260 | __func__, dax_region->align, fault_size); | |
dee41079 DW |
261 | return VM_FAULT_SIGBUS; |
262 | } | |
263 | ||
0134ed4f DJ |
264 | if (fault_size != dax_region->align) |
265 | return VM_FAULT_SIGBUS; | |
266 | ||
73616367 | 267 | phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE); |
dee41079 | 268 | if (phys == -1) { |
52084f89 | 269 | dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, |
dee41079 DW |
270 | vmf->pgoff); |
271 | return VM_FAULT_SIGBUS; | |
272 | } | |
273 | ||
274 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
275 | ||
11bac800 | 276 | rc = vm_insert_mixed(vmf->vma, vmf->address, pfn); |
dee41079 DW |
277 | |
278 | if (rc == -ENOMEM) | |
279 | return VM_FAULT_OOM; | |
280 | if (rc < 0 && rc != -EBUSY) | |
281 | return VM_FAULT_SIGBUS; | |
282 | ||
283 | return VM_FAULT_NOPAGE; | |
284 | } | |
285 | ||
5f0694b3 | 286 | static int __dev_dax_pmd_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) |
dee41079 | 287 | { |
d8a849e1 | 288 | unsigned long pmd_addr = vmf->address & PMD_MASK; |
5f0694b3 | 289 | struct device *dev = &dev_dax->dev; |
dee41079 DW |
290 | struct dax_region *dax_region; |
291 | phys_addr_t phys; | |
292 | pgoff_t pgoff; | |
293 | pfn_t pfn; | |
0134ed4f | 294 | unsigned int fault_size = PMD_SIZE; |
dee41079 | 295 | |
5f0694b3 | 296 | if (check_vma(dev_dax, vmf->vma, __func__)) |
dee41079 DW |
297 | return VM_FAULT_SIGBUS; |
298 | ||
5f0694b3 | 299 | dax_region = dev_dax->region; |
dee41079 | 300 | if (dax_region->align > PMD_SIZE) { |
76202620 OH |
301 | dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", |
302 | __func__, dax_region->align, fault_size); | |
dee41079 DW |
303 | return VM_FAULT_SIGBUS; |
304 | } | |
305 | ||
306 | /* dax pmd mappings require pfn_t_devmap() */ | |
307 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { | |
76202620 | 308 | dev_dbg(dev, "%s: region lacks devmap flags\n", __func__); |
dee41079 DW |
309 | return VM_FAULT_SIGBUS; |
310 | } | |
311 | ||
0134ed4f DJ |
312 | if (fault_size < dax_region->align) |
313 | return VM_FAULT_SIGBUS; | |
314 | else if (fault_size > dax_region->align) | |
315 | return VM_FAULT_FALLBACK; | |
316 | ||
317 | /* if we are outside of the VMA */ | |
318 | if (pmd_addr < vmf->vma->vm_start || | |
319 | (pmd_addr + PMD_SIZE) > vmf->vma->vm_end) | |
320 | return VM_FAULT_SIGBUS; | |
321 | ||
f4200391 | 322 | pgoff = linear_page_index(vmf->vma, pmd_addr); |
73616367 | 323 | phys = dax_pgoff_to_phys(dev_dax, pgoff, PMD_SIZE); |
dee41079 | 324 | if (phys == -1) { |
52084f89 | 325 | dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, |
dee41079 DW |
326 | pgoff); |
327 | return VM_FAULT_SIGBUS; | |
328 | } | |
329 | ||
330 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
331 | ||
f4200391 | 332 | return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd, pfn, |
d8a849e1 | 333 | vmf->flags & FAULT_FLAG_WRITE); |
dee41079 DW |
334 | } |
335 | ||
9557feee | 336 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
5f0694b3 | 337 | static int __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) |
9557feee DJ |
338 | { |
339 | unsigned long pud_addr = vmf->address & PUD_MASK; | |
5f0694b3 | 340 | struct device *dev = &dev_dax->dev; |
9557feee DJ |
341 | struct dax_region *dax_region; |
342 | phys_addr_t phys; | |
343 | pgoff_t pgoff; | |
344 | pfn_t pfn; | |
70b085b0 DJ |
345 | unsigned int fault_size = PUD_SIZE; |
346 | ||
9557feee | 347 | |
5f0694b3 | 348 | if (check_vma(dev_dax, vmf->vma, __func__)) |
9557feee DJ |
349 | return VM_FAULT_SIGBUS; |
350 | ||
5f0694b3 | 351 | dax_region = dev_dax->region; |
9557feee | 352 | if (dax_region->align > PUD_SIZE) { |
76202620 OH |
353 | dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", |
354 | __func__, dax_region->align, fault_size); | |
9557feee DJ |
355 | return VM_FAULT_SIGBUS; |
356 | } | |
357 | ||
358 | /* dax pud mappings require pfn_t_devmap() */ | |
359 | if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { | |
76202620 | 360 | dev_dbg(dev, "%s: region lacks devmap flags\n", __func__); |
9557feee DJ |
361 | return VM_FAULT_SIGBUS; |
362 | } | |
363 | ||
70b085b0 DJ |
364 | if (fault_size < dax_region->align) |
365 | return VM_FAULT_SIGBUS; | |
366 | else if (fault_size > dax_region->align) | |
367 | return VM_FAULT_FALLBACK; | |
368 | ||
369 | /* if we are outside of the VMA */ | |
370 | if (pud_addr < vmf->vma->vm_start || | |
371 | (pud_addr + PUD_SIZE) > vmf->vma->vm_end) | |
372 | return VM_FAULT_SIGBUS; | |
373 | ||
9557feee | 374 | pgoff = linear_page_index(vmf->vma, pud_addr); |
73616367 | 375 | phys = dax_pgoff_to_phys(dev_dax, pgoff, PUD_SIZE); |
9557feee | 376 | if (phys == -1) { |
52084f89 | 377 | dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, |
9557feee DJ |
378 | pgoff); |
379 | return VM_FAULT_SIGBUS; | |
380 | } | |
381 | ||
382 | pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); | |
383 | ||
384 | return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn, | |
385 | vmf->flags & FAULT_FLAG_WRITE); | |
386 | } | |
387 | #else | |
5f0694b3 | 388 | static int __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf) |
9557feee DJ |
389 | { |
390 | return VM_FAULT_FALLBACK; | |
391 | } | |
392 | #endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
393 | ||
5f0694b3 | 394 | static int dev_dax_huge_fault(struct vm_fault *vmf, |
c791ace1 | 395 | enum page_entry_size pe_size) |
dee41079 | 396 | { |
956a4cd2 | 397 | int rc, id; |
f4200391 | 398 | struct file *filp = vmf->vma->vm_file; |
5f0694b3 | 399 | struct dev_dax *dev_dax = filp->private_data; |
dee41079 | 400 | |
5f0694b3 | 401 | dev_dbg(&dev_dax->dev, "%s: %s: %s (%#lx - %#lx) size = %d\n", __func__, |
d8a849e1 | 402 | current->comm, (vmf->flags & FAULT_FLAG_WRITE) |
f4200391 | 403 | ? "write" : "read", |
76202620 | 404 | vmf->vma->vm_start, vmf->vma->vm_end, pe_size); |
dee41079 | 405 | |
7b6be844 | 406 | id = dax_read_lock(); |
c791ace1 DJ |
407 | switch (pe_size) { |
408 | case PE_SIZE_PTE: | |
5f0694b3 | 409 | rc = __dev_dax_pte_fault(dev_dax, vmf); |
a2d58167 | 410 | break; |
c791ace1 | 411 | case PE_SIZE_PMD: |
5f0694b3 | 412 | rc = __dev_dax_pmd_fault(dev_dax, vmf); |
9557feee | 413 | break; |
c791ace1 | 414 | case PE_SIZE_PUD: |
5f0694b3 | 415 | rc = __dev_dax_pud_fault(dev_dax, vmf); |
a2d58167 DJ |
416 | break; |
417 | default: | |
54eafcc9 | 418 | rc = VM_FAULT_SIGBUS; |
a2d58167 | 419 | } |
7b6be844 | 420 | dax_read_unlock(id); |
dee41079 DW |
421 | |
422 | return rc; | |
423 | } | |
424 | ||
5f0694b3 | 425 | static int dev_dax_fault(struct vm_fault *vmf) |
c791ace1 | 426 | { |
5f0694b3 | 427 | return dev_dax_huge_fault(vmf, PE_SIZE_PTE); |
c791ace1 DJ |
428 | } |
429 | ||
5f0694b3 DW |
430 | static const struct vm_operations_struct dax_vm_ops = { |
431 | .fault = dev_dax_fault, | |
432 | .huge_fault = dev_dax_huge_fault, | |
dee41079 DW |
433 | }; |
434 | ||
af69f51e | 435 | static int dax_mmap(struct file *filp, struct vm_area_struct *vma) |
dee41079 | 436 | { |
5f0694b3 | 437 | struct dev_dax *dev_dax = filp->private_data; |
7b6be844 | 438 | int rc, id; |
dee41079 | 439 | |
5f0694b3 | 440 | dev_dbg(&dev_dax->dev, "%s\n", __func__); |
dee41079 | 441 | |
7b6be844 DW |
442 | /* |
443 | * We lock to check dax_dev liveness and will re-check at | |
444 | * fault time. | |
445 | */ | |
446 | id = dax_read_lock(); | |
5f0694b3 | 447 | rc = check_vma(dev_dax, vma, __func__); |
7b6be844 | 448 | dax_read_unlock(id); |
dee41079 DW |
449 | if (rc) |
450 | return rc; | |
451 | ||
5f0694b3 | 452 | vma->vm_ops = &dax_vm_ops; |
dee41079 DW |
453 | vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; |
454 | return 0; | |
043a9255 DW |
455 | } |
456 | ||
457 | /* return an unmapped area aligned to the dax region specified alignment */ | |
af69f51e | 458 | static unsigned long dax_get_unmapped_area(struct file *filp, |
043a9255 DW |
459 | unsigned long addr, unsigned long len, unsigned long pgoff, |
460 | unsigned long flags) | |
461 | { | |
462 | unsigned long off, off_end, off_align, len_align, addr_align, align; | |
5f0694b3 | 463 | struct dev_dax *dev_dax = filp ? filp->private_data : NULL; |
043a9255 DW |
464 | struct dax_region *dax_region; |
465 | ||
5f0694b3 | 466 | if (!dev_dax || addr) |
043a9255 DW |
467 | goto out; |
468 | ||
5f0694b3 | 469 | dax_region = dev_dax->region; |
043a9255 DW |
470 | align = dax_region->align; |
471 | off = pgoff << PAGE_SHIFT; | |
472 | off_end = off + len; | |
473 | off_align = round_up(off, align); | |
474 | ||
475 | if ((off_end <= off_align) || ((off_end - off_align) < align)) | |
476 | goto out; | |
477 | ||
478 | len_align = len + align; | |
479 | if ((off + len_align) < off) | |
480 | goto out; | |
dee41079 | 481 | |
043a9255 DW |
482 | addr_align = current->mm->get_unmapped_area(filp, addr, len_align, |
483 | pgoff, flags); | |
484 | if (!IS_ERR_VALUE(addr_align)) { | |
485 | addr_align += (off - addr_align) & (align - 1); | |
486 | return addr_align; | |
487 | } | |
488 | out: | |
489 | return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags); | |
490 | } | |
491 | ||
af69f51e | 492 | static int dax_open(struct inode *inode, struct file *filp) |
043a9255 | 493 | { |
7b6be844 DW |
494 | struct dax_device *dax_dev = inode_dax(inode); |
495 | struct inode *__dax_inode = dax_inode(dax_dev); | |
496 | struct dev_dax *dev_dax = dax_get_private(dax_dev); | |
043a9255 | 497 | |
5f0694b3 | 498 | dev_dbg(&dev_dax->dev, "%s\n", __func__); |
7b6be844 DW |
499 | inode->i_mapping = __dax_inode->i_mapping; |
500 | inode->i_mapping->host = __dax_inode; | |
3bc52c45 | 501 | filp->f_mapping = inode->i_mapping; |
5f0694b3 | 502 | filp->private_data = dev_dax; |
ebd84d72 | 503 | inode->i_flags = S_DAX; |
043a9255 | 504 | |
043a9255 DW |
505 | return 0; |
506 | } | |
dee41079 | 507 | |
af69f51e | 508 | static int dax_release(struct inode *inode, struct file *filp) |
043a9255 | 509 | { |
5f0694b3 | 510 | struct dev_dax *dev_dax = filp->private_data; |
043a9255 | 511 | |
5f0694b3 | 512 | dev_dbg(&dev_dax->dev, "%s\n", __func__); |
043a9255 | 513 | return 0; |
dee41079 DW |
514 | } |
515 | ||
ab68f262 DW |
516 | static const struct file_operations dax_fops = { |
517 | .llseek = noop_llseek, | |
518 | .owner = THIS_MODULE, | |
af69f51e DW |
519 | .open = dax_open, |
520 | .release = dax_release, | |
521 | .get_unmapped_area = dax_get_unmapped_area, | |
522 | .mmap = dax_mmap, | |
ab68f262 DW |
523 | }; |
524 | ||
5f0694b3 | 525 | static void dev_dax_release(struct device *dev) |
043a9255 | 526 | { |
5f0694b3 DW |
527 | struct dev_dax *dev_dax = to_dev_dax(dev); |
528 | struct dax_region *dax_region = dev_dax->region; | |
7b6be844 | 529 | struct dax_device *dax_dev = dev_dax->dax_dev; |
043a9255 | 530 | |
5f0694b3 | 531 | ida_simple_remove(&dax_region->ida, dev_dax->id); |
ebd84d72 | 532 | dax_region_put(dax_region); |
7b6be844 | 533 | put_dax(dax_dev); |
5f0694b3 | 534 | kfree(dev_dax); |
ebd84d72 DW |
535 | } |
536 | ||
5f0694b3 | 537 | static void kill_dev_dax(struct dev_dax *dev_dax) |
ebd84d72 | 538 | { |
7b6be844 DW |
539 | struct dax_device *dax_dev = dev_dax->dax_dev; |
540 | struct inode *inode = dax_inode(dax_dev); | |
541 | ||
542 | kill_dax(dax_dev); | |
543 | unmap_mapping_range(inode->i_mapping, 0, 0, 1); | |
ebd84d72 DW |
544 | } |
545 | ||
5f0694b3 | 546 | static void unregister_dev_dax(void *dev) |
ebd84d72 | 547 | { |
5f0694b3 | 548 | struct dev_dax *dev_dax = to_dev_dax(dev); |
7b6be844 DW |
549 | struct dax_device *dax_dev = dev_dax->dax_dev; |
550 | struct inode *inode = dax_inode(dax_dev); | |
551 | struct cdev *cdev = inode->i_cdev; | |
ebd84d72 | 552 | |
043a9255 DW |
553 | dev_dbg(dev, "%s\n", __func__); |
554 | ||
5f0694b3 | 555 | kill_dev_dax(dev_dax); |
7b6be844 | 556 | cdev_device_del(cdev, dev); |
92a3fa07 | 557 | put_device(dev); |
043a9255 DW |
558 | } |
559 | ||
5f0694b3 | 560 | struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, |
d76911ee | 561 | struct resource *res, int count) |
043a9255 DW |
562 | { |
563 | struct device *parent = dax_region->dev; | |
7b6be844 | 564 | struct dax_device *dax_dev; |
5f0694b3 | 565 | struct dev_dax *dev_dax; |
7b6be844 | 566 | struct inode *inode; |
043a9255 | 567 | struct device *dev; |
ba09c01d | 568 | struct cdev *cdev; |
7b6be844 | 569 | int rc = 0, i; |
043a9255 | 570 | |
5f0694b3 DW |
571 | dev_dax = kzalloc(sizeof(*dev_dax) + sizeof(*res) * count, GFP_KERNEL); |
572 | if (!dev_dax) | |
d76911ee | 573 | return ERR_PTR(-ENOMEM); |
043a9255 | 574 | |
9d2d01a0 DW |
575 | for (i = 0; i < count; i++) { |
576 | if (!IS_ALIGNED(res[i].start, dax_region->align) | |
577 | || !IS_ALIGNED(resource_size(&res[i]), | |
578 | dax_region->align)) { | |
579 | rc = -EINVAL; | |
580 | break; | |
581 | } | |
5f0694b3 DW |
582 | dev_dax->res[i].start = res[i].start; |
583 | dev_dax->res[i].end = res[i].end; | |
9d2d01a0 DW |
584 | } |
585 | ||
586 | if (i < count) | |
587 | goto err_id; | |
588 | ||
5f0694b3 DW |
589 | dev_dax->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL); |
590 | if (dev_dax->id < 0) { | |
591 | rc = dev_dax->id; | |
043a9255 DW |
592 | goto err_id; |
593 | } | |
594 | ||
6568b08b DW |
595 | /* |
596 | * No 'host' or dax_operations since there is no access to this | |
597 | * device outside of mmap of the resulting character device. | |
598 | */ | |
599 | dax_dev = alloc_dax(dev_dax, NULL, NULL); | |
7b6be844 DW |
600 | if (!dax_dev) |
601 | goto err_dax; | |
3bc52c45 | 602 | |
7b6be844 | 603 | /* from here on we're committed to teardown via dax_dev_release() */ |
5f0694b3 | 604 | dev = &dev_dax->dev; |
ebd84d72 | 605 | device_initialize(dev); |
ba09c01d | 606 | |
7b6be844 DW |
607 | inode = dax_inode(dax_dev); |
608 | cdev = inode->i_cdev; | |
ba09c01d DW |
609 | cdev_init(cdev, &dax_fops); |
610 | cdev->owner = parent->driver->owner; | |
ba09c01d | 611 | |
5f0694b3 | 612 | dev_dax->num_resources = count; |
7b6be844 | 613 | dev_dax->dax_dev = dax_dev; |
5f0694b3 | 614 | dev_dax->region = dax_region; |
ba09c01d DW |
615 | kref_get(&dax_region->kref); |
616 | ||
7b6be844 | 617 | dev->devt = inode->i_rdev; |
ebd84d72 DW |
618 | dev->class = dax_class; |
619 | dev->parent = parent; | |
620 | dev->groups = dax_attribute_groups; | |
5f0694b3 DW |
621 | dev->release = dev_dax_release; |
622 | dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id); | |
92a3fa07 LG |
623 | |
624 | rc = cdev_device_add(cdev, dev); | |
ebd84d72 | 625 | if (rc) { |
5f0694b3 | 626 | kill_dev_dax(dev_dax); |
ebd84d72 | 627 | put_device(dev); |
d76911ee | 628 | return ERR_PTR(rc); |
ebd84d72 | 629 | } |
043a9255 | 630 | |
5f0694b3 | 631 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev); |
d76911ee DW |
632 | if (rc) |
633 | return ERR_PTR(rc); | |
634 | ||
5f0694b3 | 635 | return dev_dax; |
043a9255 | 636 | |
7b6be844 | 637 | err_dax: |
5f0694b3 | 638 | ida_simple_remove(&dax_region->ida, dev_dax->id); |
043a9255 | 639 | err_id: |
5f0694b3 | 640 | kfree(dev_dax); |
043a9255 | 641 | |
d76911ee | 642 | return ERR_PTR(rc); |
043a9255 | 643 | } |
5f0694b3 | 644 | EXPORT_SYMBOL_GPL(devm_create_dev_dax); |
043a9255 | 645 | |
ab68f262 DW |
646 | static int __init dax_init(void) |
647 | { | |
ab68f262 | 648 | dax_class = class_create(THIS_MODULE, "dax"); |
7b6be844 | 649 | return PTR_ERR_OR_ZERO(dax_class); |
ab68f262 DW |
650 | } |
651 | ||
652 | static void __exit dax_exit(void) | |
653 | { | |
654 | class_destroy(dax_class); | |
ab68f262 DW |
655 | } |
656 | ||
657 | MODULE_AUTHOR("Intel Corporation"); | |
658 | MODULE_LICENSE("GPL v2"); | |
659 | subsys_initcall(dax_init); | |
660 | module_exit(dax_exit); |