1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
5 #include <linux/device.h>
6 #include <linux/sizes.h>
13 void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
15 struct nd_namespace_common *ndns = *_ndns;
16 struct nvdimm_bus *nvdimm_bus;
21 nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
22 lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
23 dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
26 put_device(&ndns->dev);
29 void nd_detach_ndns(struct device *dev,
30 struct nd_namespace_common **_ndns)
32 struct nd_namespace_common *ndns = *_ndns;
36 get_device(&ndns->dev);
37 nvdimm_bus_lock(&ndns->dev);
38 __nd_detach_ndns(dev, _ndns);
39 nvdimm_bus_unlock(&ndns->dev);
40 put_device(&ndns->dev);
43 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
44 struct nd_namespace_common **_ndns)
46 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
50 lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
51 dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
54 get_device(&attach->dev);
58 bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
59 struct nd_namespace_common **_ndns)
63 nvdimm_bus_lock(&attach->dev);
64 claimed = __nd_attach_ndns(dev, attach, _ndns);
65 nvdimm_bus_unlock(&attach->dev);
69 static int namespace_match(struct device *dev, void *data)
73 return strcmp(name, dev_name(dev)) == 0;
76 static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
78 struct nd_region *nd_region = to_nd_region(dev->parent);
79 struct device *seed = NULL;
82 seed = nd_region->btt_seed;
83 else if (is_nd_pfn(dev))
84 seed = nd_region->pfn_seed;
85 else if (is_nd_dax(dev))
86 seed = nd_region->dax_seed;
88 if (seed == dev || ndns || dev->driver)
93 struct nd_pfn *to_nd_pfn_safe(struct device *dev)
96 * pfn device attributes are re-used by dax device instances, so we
97 * need to be careful to correct device-to-nd_pfn conversion.
100 return to_nd_pfn(dev);
102 if (is_nd_dax(dev)) {
103 struct nd_dax *nd_dax = to_nd_dax(dev);
105 return &nd_dax->nd_pfn;
112 static void nd_detach_and_reset(struct device *dev,
113 struct nd_namespace_common **_ndns)
115 /* detach the namespace and destroy / reset the device */
116 __nd_detach_ndns(dev, _ndns);
117 if (is_idle(dev, *_ndns)) {
118 nd_device_unregister(dev, ND_ASYNC);
119 } else if (is_nd_btt(dev)) {
120 struct nd_btt *nd_btt = to_nd_btt(dev);
125 } else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
126 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
130 nd_pfn->mode = PFN_MODE_NONE;
134 ssize_t nd_namespace_store(struct device *dev,
135 struct nd_namespace_common **_ndns, const char *buf,
138 struct nd_namespace_common *ndns;
139 struct device *found;
143 dev_dbg(dev, "namespace already active\n");
147 name = kstrndup(buf, len, GFP_KERNEL);
152 if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
160 if (strcmp(name, "") == 0) {
161 nd_detach_and_reset(dev, _ndns);
164 dev_dbg(dev, "namespace already set to: %s\n",
165 dev_name(&ndns->dev));
170 found = device_find_child(dev->parent, name, namespace_match);
172 dev_dbg(dev, "'%s' not found under %s\n", name,
173 dev_name(dev->parent));
178 ndns = to_ndns(found);
180 switch (ndns->claim_class) {
181 case NVDIMM_CCLASS_NONE:
183 case NVDIMM_CCLASS_BTT:
184 case NVDIMM_CCLASS_BTT2:
185 if (!is_nd_btt(dev)) {
190 case NVDIMM_CCLASS_PFN:
191 if (!is_nd_pfn(dev)) {
196 case NVDIMM_CCLASS_DAX:
197 if (!is_nd_dax(dev)) {
208 if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
209 dev_dbg(dev, "%s too small to host\n", name);
214 WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
215 if (!__nd_attach_ndns(dev, ndns, _ndns)) {
216 dev_dbg(dev, "%s already claimed\n",
217 dev_name(&ndns->dev));
222 put_device(&ndns->dev); /* from device_find_child */
229 * nd_sb_checksum: compute checksum for a generic info block
231 * Returns a fletcher64 checksum of everything in the given info block
232 * except the last field (since that's where the checksum lives).
234 u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
239 BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
240 BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
241 BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
243 sum_save = nd_gen_sb->checksum;
244 nd_gen_sb->checksum = 0;
245 sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
246 nd_gen_sb->checksum = sum_save;
249 EXPORT_SYMBOL(nd_sb_checksum);
251 static int nsio_rw_bytes(struct nd_namespace_common *ndns,
252 resource_size_t offset, void *buf, size_t size, int rw,
255 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
256 unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
257 sector_t sector = offset >> 9;
263 if (unlikely(offset + size > nsio->size)) {
264 dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
269 if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
271 if (memcpy_mcsafe(buf, nsio->addr + offset, size) != 0)
276 if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
277 if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
278 && !(flags & NVDIMM_IO_ATOMIC)) {
282 cleared = nvdimm_clear_poison(&ndns->dev,
283 nsio->res.start + offset, size);
286 if (cleared > 0 && cleared / 512) {
288 badblocks_clear(&nsio->bb, sector, cleared);
290 arch_invalidate_pmem(nsio->addr + offset, size);
295 memcpy_flushcache(nsio->addr + offset, buf, size);
296 ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
303 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
304 resource_size_t size)
306 struct resource *res = &nsio->res;
307 struct nd_namespace_common *ndns = &nsio->common;
310 if (!devm_request_mem_region(dev, res->start, size,
311 dev_name(&ndns->dev))) {
312 dev_warn(dev, "could not reserve region %pR\n", res);
316 ndns->rw_bytes = nsio_rw_bytes;
317 if (devm_init_badblocks(dev, &nsio->bb))
319 nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
322 nsio->addr = devm_memremap(dev, res->start, size, ARCH_MEMREMAP_PMEM);
324 return PTR_ERR_OR_ZERO(nsio->addr);
327 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
329 struct resource *res = &nsio->res;
331 devm_memunmap(dev, nsio->addr);
332 devm_exit_badblocks(dev, &nsio->bb);
333 devm_release_mem_region(dev, res->start, nsio->size);