2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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.
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.
13 #include <linux/device.h>
14 #include <linux/sizes.h>
15 #include <linux/pmem.h>
21 void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
23 struct nd_namespace_common *ndns = *_ndns;
25 dev_WARN_ONCE(dev, !mutex_is_locked(&ndns->dev.mutex)
26 || ndns->claim != dev,
27 "%s: invalid claim\n", __func__);
30 put_device(&ndns->dev);
33 void nd_detach_ndns(struct device *dev,
34 struct nd_namespace_common **_ndns)
36 struct nd_namespace_common *ndns = *_ndns;
40 get_device(&ndns->dev);
41 device_lock(&ndns->dev);
42 __nd_detach_ndns(dev, _ndns);
43 device_unlock(&ndns->dev);
44 put_device(&ndns->dev);
47 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
48 struct nd_namespace_common **_ndns)
52 dev_WARN_ONCE(dev, !mutex_is_locked(&attach->dev.mutex)
54 "%s: invalid claim\n", __func__);
57 get_device(&attach->dev);
61 bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
62 struct nd_namespace_common **_ndns)
66 device_lock(&attach->dev);
67 claimed = __nd_attach_ndns(dev, attach, _ndns);
68 device_unlock(&attach->dev);
72 static int namespace_match(struct device *dev, void *data)
76 return strcmp(name, dev_name(dev)) == 0;
79 static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
81 struct nd_region *nd_region = to_nd_region(dev->parent);
82 struct device *seed = NULL;
85 seed = nd_region->btt_seed;
86 else if (is_nd_pfn(dev))
87 seed = nd_region->pfn_seed;
88 else if (is_nd_dax(dev))
89 seed = nd_region->dax_seed;
91 if (seed == dev || ndns || dev->driver)
96 static void nd_detach_and_reset(struct device *dev,
97 struct nd_namespace_common **_ndns)
99 /* detach the namespace and destroy / reset the device */
100 nd_detach_ndns(dev, _ndns);
101 if (is_idle(dev, *_ndns)) {
102 nd_device_unregister(dev, ND_ASYNC);
103 } else if (is_nd_btt(dev)) {
104 struct nd_btt *nd_btt = to_nd_btt(dev);
109 } else if (is_nd_pfn(dev)) {
110 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
114 nd_pfn->mode = PFN_MODE_NONE;
118 ssize_t nd_namespace_store(struct device *dev,
119 struct nd_namespace_common **_ndns, const char *buf,
122 struct nd_namespace_common *ndns;
123 struct device *found;
127 dev_dbg(dev, "%s: -EBUSY\n", __func__);
131 name = kstrndup(buf, len, GFP_KERNEL);
136 if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
144 if (strcmp(name, "") == 0) {
145 nd_detach_and_reset(dev, _ndns);
148 dev_dbg(dev, "namespace already set to: %s\n",
149 dev_name(&ndns->dev));
154 found = device_find_child(dev->parent, name, namespace_match);
156 dev_dbg(dev, "'%s' not found under %s\n", name,
157 dev_name(dev->parent));
162 ndns = to_ndns(found);
163 if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
164 dev_dbg(dev, "%s too small to host\n", name);
169 WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
170 if (!nd_attach_ndns(dev, ndns, _ndns)) {
171 dev_dbg(dev, "%s already claimed\n",
172 dev_name(&ndns->dev));
177 put_device(&ndns->dev); /* from device_find_child */
184 * nd_sb_checksum: compute checksum for a generic info block
186 * Returns a fletcher64 checksum of everything in the given info block
187 * except the last field (since that's where the checksum lives).
189 u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
194 BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
195 BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
196 BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
198 sum_save = nd_gen_sb->checksum;
199 nd_gen_sb->checksum = 0;
200 sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
201 nd_gen_sb->checksum = sum_save;
204 EXPORT_SYMBOL(nd_sb_checksum);
206 static int nsio_rw_bytes(struct nd_namespace_common *ndns,
207 resource_size_t offset, void *buf, size_t size, int rw)
209 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
211 if (unlikely(offset + size > nsio->size)) {
212 dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
217 unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
219 if (unlikely(is_bad_pmem(&nsio->bb, offset / 512, sz_align)))
221 return memcpy_from_pmem(buf, nsio->addr + offset, size);
223 memcpy_to_pmem(nsio->addr + offset, buf, size);
230 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio)
232 struct resource *res = &nsio->res;
233 struct nd_namespace_common *ndns = &nsio->common;
235 nsio->size = resource_size(res);
236 if (!devm_request_mem_region(dev, res->start, resource_size(res),
238 dev_warn(dev, "could not reserve region %pR\n", res);
242 ndns->rw_bytes = nsio_rw_bytes;
243 if (devm_init_badblocks(dev, &nsio->bb))
245 nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
248 nsio->addr = devm_memremap(dev, res->start, resource_size(res),
250 if (IS_ERR(nsio->addr))
251 return PTR_ERR(nsio->addr);
254 EXPORT_SYMBOL_GPL(devm_nsio_enable);
256 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
258 struct resource *res = &nsio->res;
260 devm_memunmap(dev, nsio->addr);
261 devm_exit_badblocks(dev, &nsio->bb);
262 devm_release_mem_region(dev, res->start, resource_size(res));
264 EXPORT_SYMBOL_GPL(devm_nsio_disable);