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>
7 #include <linux/badblocks.h>
14 void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
16 struct nd_namespace_common *ndns = *_ndns;
17 struct nvdimm_bus *nvdimm_bus;
22 nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
23 lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
24 dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
27 put_device(&ndns->dev);
30 void nd_detach_ndns(struct device *dev,
31 struct nd_namespace_common **_ndns)
33 struct nd_namespace_common *ndns = *_ndns;
37 get_device(&ndns->dev);
38 nvdimm_bus_lock(&ndns->dev);
39 __nd_detach_ndns(dev, _ndns);
40 nvdimm_bus_unlock(&ndns->dev);
41 put_device(&ndns->dev);
44 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
45 struct nd_namespace_common **_ndns)
47 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
51 lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
52 dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
55 get_device(&attach->dev);
59 bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
60 struct nd_namespace_common **_ndns)
64 nvdimm_bus_lock(&attach->dev);
65 claimed = __nd_attach_ndns(dev, attach, _ndns);
66 nvdimm_bus_unlock(&attach->dev);
70 static int namespace_match(struct device *dev, void *data)
74 return strcmp(name, dev_name(dev)) == 0;
77 static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
79 struct nd_region *nd_region = to_nd_region(dev->parent);
80 struct device *seed = NULL;
83 seed = nd_region->btt_seed;
84 else if (is_nd_pfn(dev))
85 seed = nd_region->pfn_seed;
86 else if (is_nd_dax(dev))
87 seed = nd_region->dax_seed;
89 if (seed == dev || ndns || dev->driver)
94 struct nd_pfn *to_nd_pfn_safe(struct device *dev)
97 * pfn device attributes are re-used by dax device instances, so we
98 * need to be careful to correct device-to-nd_pfn conversion.
101 return to_nd_pfn(dev);
103 if (is_nd_dax(dev)) {
104 struct nd_dax *nd_dax = to_nd_dax(dev);
106 return &nd_dax->nd_pfn;
113 static void nd_detach_and_reset(struct device *dev,
114 struct nd_namespace_common **_ndns)
116 /* detach the namespace and destroy / reset the device */
117 __nd_detach_ndns(dev, _ndns);
118 if (is_idle(dev, *_ndns)) {
119 nd_device_unregister(dev, ND_ASYNC);
120 } else if (is_nd_btt(dev)) {
121 struct nd_btt *nd_btt = to_nd_btt(dev);
126 } else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
127 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
131 nd_pfn->mode = PFN_MODE_NONE;
135 ssize_t nd_namespace_store(struct device *dev,
136 struct nd_namespace_common **_ndns, const char *buf,
139 struct nd_namespace_common *ndns;
140 struct device *found;
144 dev_dbg(dev, "namespace already active\n");
148 name = kstrndup(buf, len, GFP_KERNEL);
153 if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
161 if (strcmp(name, "") == 0) {
162 nd_detach_and_reset(dev, _ndns);
165 dev_dbg(dev, "namespace already set to: %s\n",
166 dev_name(&ndns->dev));
171 found = device_find_child(dev->parent, name, namespace_match);
173 dev_dbg(dev, "'%s' not found under %s\n", name,
174 dev_name(dev->parent));
179 ndns = to_ndns(found);
181 switch (ndns->claim_class) {
182 case NVDIMM_CCLASS_NONE:
184 case NVDIMM_CCLASS_BTT:
185 case NVDIMM_CCLASS_BTT2:
186 if (!is_nd_btt(dev)) {
191 case NVDIMM_CCLASS_PFN:
192 if (!is_nd_pfn(dev)) {
197 case NVDIMM_CCLASS_DAX:
198 if (!is_nd_dax(dev)) {
209 if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
210 dev_dbg(dev, "%s too small to host\n", name);
215 WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
216 if (!__nd_attach_ndns(dev, ndns, _ndns)) {
217 dev_dbg(dev, "%s already claimed\n",
218 dev_name(&ndns->dev));
223 put_device(&ndns->dev); /* from device_find_child */
230 * nd_sb_checksum: compute checksum for a generic info block
232 * Returns a fletcher64 checksum of everything in the given info block
233 * except the last field (since that's where the checksum lives).
235 u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
240 BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
241 BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
242 BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
244 sum_save = nd_gen_sb->checksum;
245 nd_gen_sb->checksum = 0;
246 sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
247 nd_gen_sb->checksum = sum_save;
250 EXPORT_SYMBOL(nd_sb_checksum);
252 static int nsio_rw_bytes(struct nd_namespace_common *ndns,
253 resource_size_t offset, void *buf, size_t size, int rw,
256 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
257 unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
258 sector_t sector = offset >> 9;
264 if (unlikely(offset + size > nsio->size)) {
265 dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
270 if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
272 if (copy_mc_to_kernel(buf, nsio->addr + offset, size) != 0)
277 if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
278 if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
279 && !(flags & NVDIMM_IO_ATOMIC)) {
283 cleared = nvdimm_clear_poison(&ndns->dev,
284 nsio->res.start + offset, size);
287 if (cleared > 0 && cleared / 512) {
289 badblocks_clear(&nsio->bb, sector, cleared);
291 arch_invalidate_pmem(nsio->addr + offset, size);
296 memcpy_flushcache(nsio->addr + offset, buf, size);
297 ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
304 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
305 resource_size_t size)
307 struct nd_namespace_common *ndns = &nsio->common;
308 struct range range = {
309 .start = nsio->res.start,
310 .end = nsio->res.end,
314 if (!devm_request_mem_region(dev, range.start, size,
315 dev_name(&ndns->dev))) {
316 dev_warn(dev, "could not reserve region %pR\n", &nsio->res);
320 ndns->rw_bytes = nsio_rw_bytes;
321 if (devm_init_badblocks(dev, &nsio->bb))
323 nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
326 nsio->addr = devm_memremap(dev, range.start, size, ARCH_MEMREMAP_PMEM);
328 return PTR_ERR_OR_ZERO(nsio->addr);
331 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
333 struct resource *res = &nsio->res;
335 devm_memunmap(dev, nsio->addr);
336 devm_exit_badblocks(dev, &nsio->bb);
337 devm_release_mem_region(dev, res->start, nsio->size);