blob: dcb32f34a302429e6d8c35feca9711e4ce5644bc [file] [log] [blame]
Dan Williamse6dfb2d2015-04-25 03:56:17 -04001/*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
Dan Williams4d88a972015-05-31 14:41:48 -040014#include <linux/vmalloc.h>
Dan Williamse6dfb2d2015-04-25 03:56:17 -040015#include <linux/device.h>
Dan Williams62232e452015-06-08 14:27:06 -040016#include <linux/ndctl.h>
Dan Williamse6dfb2d2015-04-25 03:56:17 -040017#include <linux/slab.h>
18#include <linux/io.h>
19#include <linux/fs.h>
20#include <linux/mm.h>
21#include "nd-core.h"
Dan Williams0ba1c632015-05-30 12:35:36 -040022#include "label.h"
Dan Williams4d88a972015-05-31 14:41:48 -040023#include "nd.h"
Dan Williamse6dfb2d2015-04-25 03:56:17 -040024
25static DEFINE_IDA(dimm_ida);
26
Dan Williams4d88a972015-05-31 14:41:48 -040027/*
28 * Retrieve bus and dimm handle and return if this bus supports
29 * get_config_data commands
30 */
Toshi Kaniaee65982016-08-16 13:08:40 -060031int nvdimm_check_config_data(struct device *dev)
Dan Williams4d88a972015-05-31 14:41:48 -040032{
Toshi Kaniaee65982016-08-16 13:08:40 -060033 struct nvdimm *nvdimm = to_nvdimm(dev);
Dan Williams4d88a972015-05-31 14:41:48 -040034
Toshi Kaniaee65982016-08-16 13:08:40 -060035 if (!nvdimm->cmd_mask ||
36 !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
37 if (nvdimm->flags & NDD_ALIASING)
38 return -ENXIO;
39 else
40 return -ENOTTY;
41 }
Dan Williams4d88a972015-05-31 14:41:48 -040042
43 return 0;
44}
45
46static int validate_dimm(struct nvdimm_drvdata *ndd)
47{
Toshi Kaniaee65982016-08-16 13:08:40 -060048 int rc;
Dan Williams4d88a972015-05-31 14:41:48 -040049
Toshi Kaniaee65982016-08-16 13:08:40 -060050 if (!ndd)
51 return -EINVAL;
52
53 rc = nvdimm_check_config_data(ndd->dev);
54 if (rc)
Dan Williams4d88a972015-05-31 14:41:48 -040055 dev_dbg(ndd->dev, "%pf: %s error: %d\n",
56 __builtin_return_address(0), __func__, rc);
57 return rc;
58}
59
60/**
61 * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
62 * @nvdimm: dimm to initialize
63 */
64int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
65{
66 struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
67 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
68 struct nvdimm_bus_descriptor *nd_desc;
69 int rc = validate_dimm(ndd);
70
71 if (rc)
72 return rc;
73
74 if (cmd->config_size)
75 return 0; /* already valid */
76
77 memset(cmd, 0, sizeof(*cmd));
78 nd_desc = nvdimm_bus->nd_desc;
79 return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
Dan Williamsaef25332016-02-12 17:01:11 -080080 ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), NULL);
Dan Williams4d88a972015-05-31 14:41:48 -040081}
82
83int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
84{
85 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
86 struct nd_cmd_get_config_data_hdr *cmd;
87 struct nvdimm_bus_descriptor *nd_desc;
88 int rc = validate_dimm(ndd);
89 u32 max_cmd_size, config_size;
90 size_t offset;
91
92 if (rc)
93 return rc;
94
95 if (ndd->data)
96 return 0;
97
Dan Williams4a826c82015-06-09 16:09:36 -040098 if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
99 || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
100 dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
101 ndd->nsarea.max_xfer, ndd->nsarea.config_size);
Dan Williams4d88a972015-05-31 14:41:48 -0400102 return -ENXIO;
Dan Williams4a826c82015-06-09 16:09:36 -0400103 }
Dan Williams4d88a972015-05-31 14:41:48 -0400104
105 ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
106 if (!ndd->data)
107 ndd->data = vmalloc(ndd->nsarea.config_size);
108
109 if (!ndd->data)
110 return -ENOMEM;
111
112 max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer);
113 cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
114 if (!cmd)
115 return -ENOMEM;
116
117 nd_desc = nvdimm_bus->nd_desc;
118 for (config_size = ndd->nsarea.config_size, offset = 0;
119 config_size; config_size -= cmd->in_length,
120 offset += cmd->in_length) {
121 cmd->in_length = min(config_size, max_cmd_size);
122 cmd->in_offset = offset;
123 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
124 ND_CMD_GET_CONFIG_DATA, cmd,
Dan Williamsaef25332016-02-12 17:01:11 -0800125 cmd->in_length + sizeof(*cmd), NULL);
Dan Williams4d88a972015-05-31 14:41:48 -0400126 if (rc || cmd->status) {
127 rc = -ENXIO;
128 break;
129 }
130 memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length);
131 }
132 dev_dbg(ndd->dev, "%s: len: %zu rc: %d\n", __func__, offset, rc);
133 kfree(cmd);
134
135 return rc;
136}
137
Dan Williamsf524bf22015-05-30 12:36:02 -0400138int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
139 void *buf, size_t len)
140{
141 int rc = validate_dimm(ndd);
142 size_t max_cmd_size, buf_offset;
143 struct nd_cmd_set_config_hdr *cmd;
144 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
145 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
146
147 if (rc)
148 return rc;
149
150 if (!ndd->data)
151 return -ENXIO;
152
153 if (offset + len > ndd->nsarea.config_size)
154 return -ENXIO;
155
156 max_cmd_size = min_t(u32, PAGE_SIZE, len);
157 max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer);
158 cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
159 if (!cmd)
160 return -ENOMEM;
161
162 for (buf_offset = 0; len; len -= cmd->in_length,
163 buf_offset += cmd->in_length) {
164 size_t cmd_size;
165 u32 *status;
166
167 cmd->in_offset = offset + buf_offset;
168 cmd->in_length = min(max_cmd_size, len);
169 memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
170
171 /* status is output in the last 4-bytes of the command buffer */
172 cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
173 status = ((void *) cmd) + cmd_size - sizeof(u32);
174
175 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
Dan Williamsaef25332016-02-12 17:01:11 -0800176 ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, NULL);
Dan Williamsf524bf22015-05-30 12:36:02 -0400177 if (rc || *status) {
178 rc = rc ? rc : -ENXIO;
179 break;
180 }
181 }
182 kfree(cmd);
183
184 return rc;
185}
186
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400187static void nvdimm_release(struct device *dev)
188{
189 struct nvdimm *nvdimm = to_nvdimm(dev);
190
191 ida_simple_remove(&dimm_ida, nvdimm->id);
192 kfree(nvdimm);
193}
194
195static struct device_type nvdimm_device_type = {
196 .name = "nvdimm",
197 .release = nvdimm_release,
198};
199
Dan Williams62232e452015-06-08 14:27:06 -0400200bool is_nvdimm(struct device *dev)
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400201{
202 return dev->type == &nvdimm_device_type;
203}
204
205struct nvdimm *to_nvdimm(struct device *dev)
206{
207 struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
208
209 WARN_ON(!is_nvdimm(dev));
210 return nvdimm;
211}
212EXPORT_SYMBOL_GPL(to_nvdimm);
213
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400214struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
215{
216 struct nd_region *nd_region = &ndbr->nd_region;
217 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
218
219 return nd_mapping->nvdimm;
220}
221EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
222
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400223struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
224{
225 struct nvdimm *nvdimm = nd_mapping->nvdimm;
226
227 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
228
229 return dev_get_drvdata(&nvdimm->dev);
230}
231EXPORT_SYMBOL(to_ndd);
232
233void nvdimm_drvdata_release(struct kref *kref)
234{
235 struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
236 struct device *dev = ndd->dev;
237 struct resource *res, *_r;
238
239 dev_dbg(dev, "%s\n", __func__);
240
241 nvdimm_bus_lock(dev);
242 for_each_dpa_resource_safe(ndd, res, _r)
243 nvdimm_free_dpa(ndd, res);
244 nvdimm_bus_unlock(dev);
245
yalin wanga06a7572015-08-27 19:35:48 -0400246 kvfree(ndd->data);
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400247 kfree(ndd);
248 put_device(dev);
249}
250
251void get_ndd(struct nvdimm_drvdata *ndd)
252{
253 kref_get(&ndd->kref);
254}
255
256void put_ndd(struct nvdimm_drvdata *ndd)
257{
258 if (ndd)
259 kref_put(&ndd->kref, nvdimm_drvdata_release);
260}
261
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400262const char *nvdimm_name(struct nvdimm *nvdimm)
263{
264 return dev_name(&nvdimm->dev);
265}
266EXPORT_SYMBOL_GPL(nvdimm_name);
267
Dan Williamsba9c8dd2016-08-22 19:28:37 -0700268struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
269{
270 return &nvdimm->dev.kobj;
271}
272EXPORT_SYMBOL_GPL(nvdimm_kobj);
273
Dan Williamse3654ec2016-04-28 16:17:07 -0700274unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
275{
276 return nvdimm->cmd_mask;
277}
278EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
279
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400280void *nvdimm_provider_data(struct nvdimm *nvdimm)
281{
Dan Williams62232e452015-06-08 14:27:06 -0400282 if (nvdimm)
283 return nvdimm->provider_data;
284 return NULL;
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400285}
286EXPORT_SYMBOL_GPL(nvdimm_provider_data);
287
Dan Williams62232e452015-06-08 14:27:06 -0400288static ssize_t commands_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290{
291 struct nvdimm *nvdimm = to_nvdimm(dev);
292 int cmd, len = 0;
293
Dan Williamse3654ec2016-04-28 16:17:07 -0700294 if (!nvdimm->cmd_mask)
Dan Williams62232e452015-06-08 14:27:06 -0400295 return sprintf(buf, "\n");
296
Dan Williamse3654ec2016-04-28 16:17:07 -0700297 for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
Dan Williams62232e452015-06-08 14:27:06 -0400298 len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
299 len += sprintf(buf + len, "\n");
300 return len;
301}
302static DEVICE_ATTR_RO(commands);
303
Dan Williamseaf96152015-05-01 13:11:27 -0400304static ssize_t state_show(struct device *dev, struct device_attribute *attr,
305 char *buf)
306{
307 struct nvdimm *nvdimm = to_nvdimm(dev);
308
309 /*
310 * The state may be in the process of changing, userspace should
311 * quiesce probing if it wants a static answer
312 */
313 nvdimm_bus_lock(dev);
314 nvdimm_bus_unlock(dev);
315 return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
316 ? "active" : "idle");
317}
318static DEVICE_ATTR_RO(state);
319
Dan Williams0ba1c632015-05-30 12:35:36 -0400320static ssize_t available_slots_show(struct device *dev,
321 struct device_attribute *attr, char *buf)
322{
323 struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
324 ssize_t rc;
325 u32 nfree;
326
327 if (!ndd)
328 return -ENXIO;
329
330 nvdimm_bus_lock(dev);
331 nfree = nd_label_nfree(ndd);
332 if (nfree - 1 > nfree) {
333 dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
334 nfree = 0;
335 } else
336 nfree--;
337 rc = sprintf(buf, "%d\n", nfree);
338 nvdimm_bus_unlock(dev);
339 return rc;
340}
341static DEVICE_ATTR_RO(available_slots);
342
Dan Williams62232e452015-06-08 14:27:06 -0400343static struct attribute *nvdimm_attributes[] = {
Dan Williamseaf96152015-05-01 13:11:27 -0400344 &dev_attr_state.attr,
Dan Williams62232e452015-06-08 14:27:06 -0400345 &dev_attr_commands.attr,
Dan Williams0ba1c632015-05-30 12:35:36 -0400346 &dev_attr_available_slots.attr,
Dan Williams62232e452015-06-08 14:27:06 -0400347 NULL,
348};
349
350struct attribute_group nvdimm_attribute_group = {
351 .attrs = nvdimm_attributes,
352};
353EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
354
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400355struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
Dan Williams62232e452015-06-08 14:27:06 -0400356 const struct attribute_group **groups, unsigned long flags,
Dan Williamse5ae3b22016-06-07 17:00:04 -0700357 unsigned long cmd_mask, int num_flush,
358 struct resource *flush_wpq)
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400359{
360 struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
361 struct device *dev;
362
363 if (!nvdimm)
364 return NULL;
365
366 nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
367 if (nvdimm->id < 0) {
368 kfree(nvdimm);
369 return NULL;
370 }
371 nvdimm->provider_data = provider_data;
372 nvdimm->flags = flags;
Dan Williamse3654ec2016-04-28 16:17:07 -0700373 nvdimm->cmd_mask = cmd_mask;
Dan Williamse5ae3b22016-06-07 17:00:04 -0700374 nvdimm->num_flush = num_flush;
375 nvdimm->flush_wpq = flush_wpq;
Dan Williamseaf96152015-05-01 13:11:27 -0400376 atomic_set(&nvdimm->busy, 0);
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400377 dev = &nvdimm->dev;
378 dev_set_name(dev, "nmem%d", nvdimm->id);
379 dev->parent = &nvdimm_bus->dev;
380 dev->type = &nvdimm_device_type;
Dan Williams62232e452015-06-08 14:27:06 -0400381 dev->devt = MKDEV(nvdimm_major, nvdimm->id);
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400382 dev->groups = groups;
Dan Williams4d88a972015-05-31 14:41:48 -0400383 nd_device_register(dev);
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400384
385 return nvdimm;
386}
387EXPORT_SYMBOL_GPL(nvdimm_create);
Dan Williams4d88a972015-05-31 14:41:48 -0400388
Dan Williams762d0672016-10-04 16:09:59 -0700389int alias_dpa_busy(struct device *dev, void *data)
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700390{
Dan Williams5f377c42017-04-04 15:08:36 -0700391 resource_size_t map_end, blk_start, new;
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700392 struct blk_alloc_info *info = data;
393 struct nd_mapping *nd_mapping;
394 struct nd_region *nd_region;
395 struct nvdimm_drvdata *ndd;
396 struct resource *res;
397 int i;
398
399 if (!is_nd_pmem(dev))
400 return 0;
401
402 nd_region = to_nd_region(dev);
403 for (i = 0; i < nd_region->ndr_mappings; i++) {
404 nd_mapping = &nd_region->mapping[i];
405 if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
406 break;
407 }
408
409 if (i >= nd_region->ndr_mappings)
410 return 0;
411
412 ndd = to_ndd(nd_mapping);
413 map_end = nd_mapping->start + nd_mapping->size - 1;
414 blk_start = nd_mapping->start;
Dan Williams762d0672016-10-04 16:09:59 -0700415
416 /*
417 * In the allocation case ->res is set to free space that we are
418 * looking to validate against PMEM aliasing collision rules
419 * (i.e. BLK is allocated after all aliased PMEM).
420 */
421 if (info->res) {
422 if (info->res->start >= nd_mapping->start
423 && info->res->start < map_end)
424 /* pass */;
425 else
426 return 0;
427 }
428
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700429 retry:
430 /*
431 * Find the free dpa from the end of the last pmem allocation to
Dan Williams5f377c42017-04-04 15:08:36 -0700432 * the end of the interleave-set mapping.
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700433 */
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700434 for_each_dpa_resource(ndd, res) {
Dan Williams5f377c42017-04-04 15:08:36 -0700435 if (strncmp(res->name, "pmem", 4) != 0)
436 continue;
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700437 if ((res->start >= blk_start && res->start < map_end)
438 || (res->end >= blk_start
439 && res->end <= map_end)) {
Dan Williams5f377c42017-04-04 15:08:36 -0700440 new = max(blk_start, min(map_end + 1, res->end + 1));
441 if (new != blk_start) {
442 blk_start = new;
443 goto retry;
444 }
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700445 }
446 }
447
Dan Williams762d0672016-10-04 16:09:59 -0700448 /* update the free space range with the probed blk_start */
449 if (info->res && blk_start > info->res->start) {
450 info->res->start = max(info->res->start, blk_start);
451 if (info->res->start > info->res->end)
452 info->res->end = info->res->start - 1;
453 return 1;
454 }
455
Dan Williams5f377c42017-04-04 15:08:36 -0700456 info->available -= blk_start - nd_mapping->start;
Dan Williams762d0672016-10-04 16:09:59 -0700457
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700458 return 0;
459}
460
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400461/**
Dan Williams1b40e092015-05-01 13:34:01 -0400462 * nd_blk_available_dpa - account the unused dpa of BLK region
463 * @nd_mapping: container of dpa-resource-root + labels
464 *
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700465 * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but
466 * we arrange for them to never start at an lower dpa than the last
467 * PMEM allocation in an aliased region.
Dan Williams1b40e092015-05-01 13:34:01 -0400468 */
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700469resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
Dan Williams1b40e092015-05-01 13:34:01 -0400470{
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700471 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
472 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
Dan Williams1b40e092015-05-01 13:34:01 -0400473 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700474 struct blk_alloc_info info = {
475 .nd_mapping = nd_mapping,
476 .available = nd_mapping->size,
Dan Williams762d0672016-10-04 16:09:59 -0700477 .res = NULL,
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700478 };
Dan Williams1b40e092015-05-01 13:34:01 -0400479 struct resource *res;
480
481 if (!ndd)
482 return 0;
483
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700484 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
Dan Williams1b40e092015-05-01 13:34:01 -0400485
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700486 /* now account for busy blk allocations in unaliased dpa */
487 for_each_dpa_resource(ndd, res) {
488 if (strncmp(res->name, "blk", 3) != 0)
489 continue;
Dan Williams5f377c42017-04-04 15:08:36 -0700490 info.available -= resource_size(res);
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700491 }
492
493 return info.available;
Dan Williams1b40e092015-05-01 13:34:01 -0400494}
495
496/**
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400497 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
498 * @nd_mapping: container of dpa-resource-root + labels
499 * @nd_region: constrain available space check to this reference region
500 * @overlap: calculate available space assuming this level of overlap
501 *
502 * Validate that a PMEM label, if present, aligns with the start of an
503 * interleave set and truncate the available size at the lowest BLK
504 * overlap point.
505 *
506 * The expectation is that this routine is called multiple times as it
507 * probes for the largest BLK encroachment for any single member DIMM of
508 * the interleave set. Once that value is determined the PMEM-limit for
509 * the set can be established.
510 */
511resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
512 struct nd_mapping *nd_mapping, resource_size_t *overlap)
513{
514 resource_size_t map_start, map_end, busy = 0, available, blk_start;
515 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
516 struct resource *res;
517 const char *reason;
518
519 if (!ndd)
520 return 0;
521
522 map_start = nd_mapping->start;
523 map_end = map_start + nd_mapping->size - 1;
524 blk_start = max(map_start, map_end + 1 - *overlap);
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700525 for_each_dpa_resource(ndd, res) {
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400526 if (res->start >= map_start && res->start < map_end) {
527 if (strncmp(res->name, "blk", 3) == 0)
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700528 blk_start = min(blk_start,
529 max(map_start, res->start));
530 else if (res->end > map_end) {
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400531 reason = "misaligned to iset";
532 goto err;
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700533 } else
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400534 busy += resource_size(res);
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400535 } else if (res->end >= map_start && res->end <= map_end) {
536 if (strncmp(res->name, "blk", 3) == 0) {
537 /*
538 * If a BLK allocation overlaps the start of
539 * PMEM the entire interleave set may now only
540 * be used for BLK.
541 */
542 blk_start = map_start;
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700543 } else
544 busy += resource_size(res);
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400545 } else if (map_start > res->start && map_start < res->end) {
546 /* total eclipse of the mapping */
547 busy += nd_mapping->size;
548 blk_start = map_start;
549 }
Dan Williamsa1f3e4d2016-09-30 17:28:58 -0700550 }
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400551
552 *overlap = map_end + 1 - blk_start;
553 available = blk_start - map_start;
554 if (busy < available)
555 return available - busy;
556 return 0;
557
558 err:
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400559 nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
560 return 0;
561}
562
Dan Williams4a826c82015-06-09 16:09:36 -0400563void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
564{
565 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
566 kfree(res->name);
567 __release_region(&ndd->dpa, res->start, resource_size(res));
568}
569
570struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
571 struct nd_label_id *label_id, resource_size_t start,
572 resource_size_t n)
573{
574 char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
575 struct resource *res;
576
577 if (!name)
578 return NULL;
579
580 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
581 res = __request_region(&ndd->dpa, start, n, name, 0);
582 if (!res)
583 kfree(name);
584 return res;
585}
586
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400587/**
588 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
589 * @nvdimm: container of dpa-resource-root + labels
590 * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
591 */
592resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
593 struct nd_label_id *label_id)
594{
595 resource_size_t allocated = 0;
596 struct resource *res;
597
598 for_each_dpa_resource(ndd, res)
599 if (strcmp(res->name, label_id->id) == 0)
600 allocated += resource_size(res);
601
602 return allocated;
603}
604
Dan Williams4d88a972015-05-31 14:41:48 -0400605static int count_dimms(struct device *dev, void *c)
606{
607 int *count = c;
608
609 if (is_nvdimm(dev))
610 (*count)++;
611 return 0;
612}
613
614int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
615{
616 int count = 0;
617 /* Flush any possible dimm registration failures */
618 nd_synchronize();
619
620 device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
621 dev_dbg(&nvdimm_bus->dev, "%s: count: %d\n", __func__, count);
622 if (count != dimm_count)
623 return -ENXIO;
624 return 0;
625}
626EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
Dan Williamsb354aba2016-05-17 20:24:16 -0700627
628void __exit nvdimm_devs_exit(void)
629{
630 ida_destroy(&dimm_ida);
631}