Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Dan J Williams | 3411 | 79.92% | 36 | 70.59% |
Aneesh Kumar K.V | 442 | 10.36% | 6 | 11.76% |
Vishal Verma | 289 | 6.77% | 2 | 3.92% |
Oliver O'Halloran | 60 | 1.41% | 1 | 1.96% |
Christoph Hellwig | 33 | 0.77% | 3 | 5.88% |
Jeff Moyer | 29 | 0.68% | 1 | 1.96% |
Axel Lin | 2 | 0.05% | 1 | 1.96% |
Thomas Gleixner | 2 | 0.05% | 1 | 1.96% |
Total | 4268 | 51 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. */ #include <linux/memremap.h> #include <linux/blkdev.h> #include <linux/device.h> #include <linux/genhd.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/mm.h> #include "nd-core.h" #include "pfn.h" #include "nd.h" static void nd_pfn_release(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); struct nd_pfn *nd_pfn = to_nd_pfn(dev); dev_dbg(dev, "trace\n"); nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns); ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id); kfree(nd_pfn->uuid); kfree(nd_pfn); } struct nd_pfn *to_nd_pfn(struct device *dev) { struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev); WARN_ON(!is_nd_pfn(dev)); return nd_pfn; } EXPORT_SYMBOL(to_nd_pfn); static ssize_t mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); switch (nd_pfn->mode) { case PFN_MODE_RAM: return sprintf(buf, "ram\n"); case PFN_MODE_PMEM: return sprintf(buf, "pmem\n"); default: return sprintf(buf, "none\n"); } } static ssize_t mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc = 0; nd_device_lock(dev); nvdimm_bus_lock(dev); if (dev->driver) rc = -EBUSY; else { size_t n = len - 1; if (strncmp(buf, "pmem\n", n) == 0 || strncmp(buf, "pmem", n) == 0) { nd_pfn->mode = PFN_MODE_PMEM; } else if (strncmp(buf, "ram\n", n) == 0 || strncmp(buf, "ram", n) == 0) nd_pfn->mode = PFN_MODE_RAM; else if (strncmp(buf, "none\n", n) == 0 || strncmp(buf, "none", n) == 0) nd_pfn->mode = PFN_MODE_NONE; else rc = -EINVAL; } dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nvdimm_bus_unlock(dev); nd_device_unlock(dev); return rc ? rc : len; } static DEVICE_ATTR_RW(mode); static ssize_t align_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); return sprintf(buf, "%ld\n", nd_pfn->align); } static unsigned long *nd_pfn_supported_alignments(unsigned long *alignments) { alignments[0] = PAGE_SIZE; if (has_transparent_hugepage()) { alignments[1] = HPAGE_PMD_SIZE; if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) alignments[2] = HPAGE_PUD_SIZE; } return alignments; } /* * Use pmd mapping if supported as default alignment */ static unsigned long nd_pfn_default_alignment(void) { if (has_transparent_hugepage()) return HPAGE_PMD_SIZE; return PAGE_SIZE; } static ssize_t align_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, }; ssize_t rc; nd_device_lock(dev); nvdimm_bus_lock(dev); rc = nd_size_select_store(dev, buf, &nd_pfn->align, nd_pfn_supported_alignments(aligns)); dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nvdimm_bus_unlock(dev); nd_device_unlock(dev); return rc ? rc : len; } static DEVICE_ATTR_RW(align); static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); if (nd_pfn->uuid) return sprintf(buf, "%pUb\n", nd_pfn->uuid); return sprintf(buf, "\n"); } static ssize_t uuid_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc; nd_device_lock(dev); rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len); dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nd_device_unlock(dev); return rc ? rc : len; } static DEVICE_ATTR_RW(uuid); static ssize_t namespace_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc; nvdimm_bus_lock(dev); rc = sprintf(buf, "%s\n", nd_pfn->ndns ? dev_name(&nd_pfn->ndns->dev) : ""); nvdimm_bus_unlock(dev); return rc; } static ssize_t namespace_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc; nd_device_lock(dev); nvdimm_bus_lock(dev); rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len); dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nvdimm_bus_unlock(dev); nd_device_unlock(dev); return rc; } static DEVICE_ATTR_RW(namespace); static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc; nd_device_lock(dev); if (dev->driver) { struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; u64 offset = __le64_to_cpu(pfn_sb->dataoff); struct nd_namespace_common *ndns = nd_pfn->ndns; u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start + start_pad + offset); } else { /* no address to convey if the pfn instance is disabled */ rc = -ENXIO; } nd_device_unlock(dev); return rc; } static DEVICE_ATTR(resource, 0400, resource_show, NULL); static ssize_t size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); ssize_t rc; nd_device_lock(dev); if (dev->driver) { struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; u64 offset = __le64_to_cpu(pfn_sb->dataoff); struct nd_namespace_common *ndns = nd_pfn->ndns; u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); rc = sprintf(buf, "%llu\n", (unsigned long long) resource_size(&nsio->res) - start_pad - end_trunc - offset); } else { /* no size to convey if the pfn instance is disabled */ rc = -ENXIO; } nd_device_unlock(dev); return rc; } static DEVICE_ATTR_RO(size); static ssize_t supported_alignments_show(struct device *dev, struct device_attribute *attr, char *buf) { unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, }; return nd_size_select_show(0, nd_pfn_supported_alignments(aligns), buf); } static DEVICE_ATTR_RO(supported_alignments); static struct attribute *nd_pfn_attributes[] = { &dev_attr_mode.attr, &dev_attr_namespace.attr, &dev_attr_uuid.attr, &dev_attr_align.attr, &dev_attr_resource.attr, &dev_attr_size.attr, &dev_attr_supported_alignments.attr, NULL, }; static struct attribute_group nd_pfn_attribute_group = { .attrs = nd_pfn_attributes, }; const struct attribute_group *nd_pfn_attribute_groups[] = { &nd_pfn_attribute_group, &nd_device_attribute_group, &nd_numa_attribute_group, NULL, }; static const struct device_type nd_pfn_device_type = { .name = "nd_pfn", .release = nd_pfn_release, .groups = nd_pfn_attribute_groups, }; bool is_nd_pfn(struct device *dev) { return dev ? dev->type == &nd_pfn_device_type : false; } EXPORT_SYMBOL(is_nd_pfn); struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn, struct nd_namespace_common *ndns) { struct device *dev; if (!nd_pfn) return NULL; nd_pfn->mode = PFN_MODE_NONE; nd_pfn->align = nd_pfn_default_alignment(); dev = &nd_pfn->dev; device_initialize(&nd_pfn->dev); if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) { dev_dbg(&ndns->dev, "failed, already claimed by %s\n", dev_name(ndns->claim)); put_device(dev); return NULL; } return dev; } static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region) { struct nd_pfn *nd_pfn; struct device *dev; nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL); if (!nd_pfn) return NULL; nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL); if (nd_pfn->id < 0) { kfree(nd_pfn); return NULL; } dev = &nd_pfn->dev; dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id); dev->type = &nd_pfn_device_type; dev->parent = &nd_region->dev; return nd_pfn; } struct device *nd_pfn_create(struct nd_region *nd_region) { struct nd_pfn *nd_pfn; struct device *dev; if (!is_memory(&nd_region->dev)) return NULL; nd_pfn = nd_pfn_alloc(nd_region); dev = nd_pfn_devinit(nd_pfn, NULL); __nd_device_register(dev); return dev; } /* * nd_pfn_clear_memmap_errors() clears any errors in the volatile memmap * space associated with the namespace. If the memmap is set to DRAM, then * this is a no-op. Since the memmap area is freshly initialized during * probe, we have an opportunity to clear any badblocks in this area. */ static int nd_pfn_clear_memmap_errors(struct nd_pfn *nd_pfn) { struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent); struct nd_namespace_common *ndns = nd_pfn->ndns; void *zero_page = page_address(ZERO_PAGE(0)); struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; int num_bad, meta_num, rc, bb_present; sector_t first_bad, meta_start; struct nd_namespace_io *nsio; if (nd_pfn->mode != PFN_MODE_PMEM) return 0; nsio = to_nd_namespace_io(&ndns->dev); meta_start = (SZ_4K + sizeof(*pfn_sb)) >> 9; meta_num = (le64_to_cpu(pfn_sb->dataoff) >> 9) - meta_start; /* * re-enable the namespace with correct size so that we can access * the device memmap area. */ devm_namespace_disable(&nd_pfn->dev, ndns); rc = devm_namespace_enable(&nd_pfn->dev, ndns, le64_to_cpu(pfn_sb->dataoff)); if (rc) return rc; do { unsigned long zero_len; u64 nsoff; bb_present = badblocks_check(&nd_region->bb, meta_start, meta_num, &first_bad, &num_bad); if (bb_present) { dev_dbg(&nd_pfn->dev, "meta: %x badblocks at %llx\n", num_bad, first_bad); nsoff = ALIGN_DOWN((nd_region->ndr_start + (first_bad << 9)) - nsio->res.start, PAGE_SIZE); zero_len = ALIGN(num_bad << 9, PAGE_SIZE); while (zero_len) { unsigned long chunk = min(zero_len, PAGE_SIZE); rc = nvdimm_write_bytes(ndns, nsoff, zero_page, chunk, 0); if (rc) break; zero_len -= chunk; nsoff += chunk; } if (rc) { dev_err(&nd_pfn->dev, "error clearing %x badblocks at %llx\n", num_bad, first_bad); return rc; } } } while (bb_present); return 0; } static bool nd_supported_alignment(unsigned long align) { int i; unsigned long supported[MAX_NVDIMM_ALIGN] = { [0] = 0, }; if (align == 0) return false; nd_pfn_supported_alignments(supported); for (i = 0; supported[i]; i++) if (align == supported[i]) return true; return false; } /** * nd_pfn_validate - read and validate info-block * @nd_pfn: fsdax namespace runtime state / properties * @sig: 'devdax' or 'fsdax' signature * * Upon return the info-block buffer contents (->pfn_sb) are * indeterminate when validation fails, and a coherent info-block * otherwise. */ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) { u64 checksum, offset; struct resource *res; enum nd_pfn_mode mode; struct nd_namespace_io *nsio; unsigned long align, start_pad; struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; struct nd_namespace_common *ndns = nd_pfn->ndns; const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev); if (!pfn_sb || !ndns) return -ENODEV; if (!is_memory(nd_pfn->dev.parent)) return -ENODEV; if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0)) return -ENXIO; if (memcmp(pfn_sb->signature, sig, PFN_SIG_LEN) != 0) return -ENODEV; checksum = le64_to_cpu(pfn_sb->checksum); pfn_sb->checksum = 0; if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb)) return -ENODEV; pfn_sb->checksum = cpu_to_le64(checksum); if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0) return -ENODEV; if (__le16_to_cpu(pfn_sb->version_minor) < 1) { pfn_sb->start_pad = 0; pfn_sb->end_trunc = 0; } if (__le16_to_cpu(pfn_sb->version_minor) < 2) pfn_sb->align = 0; if (__le16_to_cpu(pfn_sb->version_minor) < 4) { pfn_sb->page_struct_size = cpu_to_le16(64); pfn_sb->page_size = cpu_to_le32(PAGE_SIZE); } switch (le32_to_cpu(pfn_sb->mode)) { case PFN_MODE_RAM: case PFN_MODE_PMEM: break; default: return -ENXIO; } align = le32_to_cpu(pfn_sb->align); offset = le64_to_cpu(pfn_sb->dataoff); start_pad = le32_to_cpu(pfn_sb->start_pad); if (align == 0) align = 1UL << ilog2(offset); mode = le32_to_cpu(pfn_sb->mode); if ((le32_to_cpu(pfn_sb->page_size) > PAGE_SIZE) && (mode == PFN_MODE_PMEM)) { dev_err(&nd_pfn->dev, "init failed, page size mismatch %d\n", le32_to_cpu(pfn_sb->page_size)); return -EOPNOTSUPP; } if ((le16_to_cpu(pfn_sb->page_struct_size) < sizeof(struct page)) && (mode == PFN_MODE_PMEM)) { dev_err(&nd_pfn->dev, "init failed, struct page size mismatch %d\n", le16_to_cpu(pfn_sb->page_struct_size)); return -EOPNOTSUPP; } /* * Check whether the we support the alignment. For Dax if the * superblock alignment is not matching, we won't initialize * the device. */ if (!nd_supported_alignment(align) && !memcmp(pfn_sb->signature, DAX_SIG, PFN_SIG_LEN)) { dev_err(&nd_pfn->dev, "init failed, alignment mismatch: " "%ld:%ld\n", nd_pfn->align, align); return -EOPNOTSUPP; } if (!nd_pfn->uuid) { /* * When probing a namepace via nd_pfn_probe() the uuid * is NULL (see: nd_pfn_devinit()) we init settings from * pfn_sb */ nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL); if (!nd_pfn->uuid) return -ENOMEM; nd_pfn->align = align; nd_pfn->mode = mode; } else { /* * When probing a pfn / dax instance we validate the * live settings against the pfn_sb */ if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0) return -ENODEV; /* * If the uuid validates, but other settings mismatch * return EINVAL because userspace has managed to change * the configuration without specifying new * identification. */ if (nd_pfn->align != align || nd_pfn->mode != mode) { dev_err(&nd_pfn->dev, "init failed, settings mismatch\n"); dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n", nd_pfn->align, align, nd_pfn->mode, mode); return -EOPNOTSUPP; } } if (align > nvdimm_namespace_capacity(ndns)) { dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n", align, nvdimm_namespace_capacity(ndns)); return -EOPNOTSUPP; } /* * These warnings are verbose because they can only trigger in * the case where the physical address alignment of the * namespace has changed since the pfn superblock was * established. */ nsio = to_nd_namespace_io(&ndns->dev); res = &nsio->res; if (offset >= resource_size(res)) { dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n", dev_name(&ndns->dev)); return -EOPNOTSUPP; } if ((align && !IS_ALIGNED(res->start + offset + start_pad, align)) || !IS_ALIGNED(offset, PAGE_SIZE)) { dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled align: %#lx\n", offset, align); return -EOPNOTSUPP; } if (!IS_ALIGNED(res->start + le32_to_cpu(pfn_sb->start_pad), memremap_compat_align())) { dev_err(&nd_pfn->dev, "resource start misaligned\n"); return -EOPNOTSUPP; } if (!IS_ALIGNED(res->end + 1 - le32_to_cpu(pfn_sb->end_trunc), memremap_compat_align())) { dev_err(&nd_pfn->dev, "resource end misaligned\n"); return -EOPNOTSUPP; } return 0; } EXPORT_SYMBOL(nd_pfn_validate); int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns) { int rc; struct nd_pfn *nd_pfn; struct device *pfn_dev; struct nd_pfn_sb *pfn_sb; struct nd_region *nd_region = to_nd_region(ndns->dev.parent); if (ndns->force_raw) return -ENODEV; switch (ndns->claim_class) { case NVDIMM_CCLASS_NONE: case NVDIMM_CCLASS_PFN: break; default: return -ENODEV; } nvdimm_bus_lock(&ndns->dev); nd_pfn = nd_pfn_alloc(nd_region); pfn_dev = nd_pfn_devinit(nd_pfn, ndns); nvdimm_bus_unlock(&ndns->dev); if (!pfn_dev) return -ENOMEM; pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); nd_pfn = to_nd_pfn(pfn_dev); nd_pfn->pfn_sb = pfn_sb; rc = nd_pfn_validate(nd_pfn, PFN_SIG); dev_dbg(dev, "pfn: %s\n", rc == 0 ? dev_name(pfn_dev) : "<none>"); if (rc < 0) { nd_detach_ndns(pfn_dev, &nd_pfn->ndns); put_device(pfn_dev); } else __nd_device_register(pfn_dev); return rc; } EXPORT_SYMBOL(nd_pfn_probe); /* * We hotplug memory at sub-section granularity, pad the reserved area * from the previous section base to the namespace base address. */ static unsigned long init_altmap_base(resource_size_t base) { unsigned long base_pfn = PHYS_PFN(base); return SUBSECTION_ALIGN_DOWN(base_pfn); } static unsigned long init_altmap_reserve(resource_size_t base) { unsigned long reserve = nd_info_block_reserve() >> PAGE_SHIFT; unsigned long base_pfn = PHYS_PFN(base); reserve += base_pfn - SUBSECTION_ALIGN_DOWN(base_pfn); return reserve; } static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) { struct resource *res = &pgmap->res; struct vmem_altmap *altmap = &pgmap->altmap; struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; u64 offset = le64_to_cpu(pfn_sb->dataoff); u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); u32 reserve = nd_info_block_reserve(); struct nd_namespace_common *ndns = nd_pfn->ndns; struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); resource_size_t base = nsio->res.start + start_pad; resource_size_t end = nsio->res.end - end_trunc; struct vmem_altmap __altmap = { .base_pfn = init_altmap_base(base), .reserve = init_altmap_reserve(base), .end_pfn = PHYS_PFN(end), }; memcpy(res, &nsio->res, sizeof(*res)); res->start += start_pad; res->end -= end_trunc; if (nd_pfn->mode == PFN_MODE_RAM) { if (offset < reserve) return -EINVAL; nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); } else if (nd_pfn->mode == PFN_MODE_PMEM) { nd_pfn->npfns = PHYS_PFN((resource_size(res) - offset)); if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns) dev_info(&nd_pfn->dev, "number of pfns truncated from %lld to %ld\n", le64_to_cpu(nd_pfn->pfn_sb->npfns), nd_pfn->npfns); memcpy(altmap, &__altmap, sizeof(*altmap)); altmap->free = PHYS_PFN(offset - reserve); altmap->alloc = 0; pgmap->flags |= PGMAP_ALTMAP_VALID; } else return -ENXIO; return 0; } static int nd_pfn_init(struct nd_pfn *nd_pfn) { struct nd_namespace_common *ndns = nd_pfn->ndns; struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); resource_size_t start, size; struct nd_region *nd_region; unsigned long npfns, align; u32 end_trunc; struct nd_pfn_sb *pfn_sb; phys_addr_t offset; const char *sig; u64 checksum; int rc; pfn_sb = devm_kmalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL); if (!pfn_sb) return -ENOMEM; nd_pfn->pfn_sb = pfn_sb; if (is_nd_dax(&nd_pfn->dev)) sig = DAX_SIG; else sig = PFN_SIG; rc = nd_pfn_validate(nd_pfn, sig); if (rc == 0) return nd_pfn_clear_memmap_errors(nd_pfn); if (rc != -ENODEV) return rc; /* no info block, do init */; memset(pfn_sb, 0, sizeof(*pfn_sb)); nd_region = to_nd_region(nd_pfn->dev.parent); if (nd_region->ro) { dev_info(&nd_pfn->dev, "%s is read-only, unable to init metadata\n", dev_name(&nd_region->dev)); return -ENXIO; } /* * Note, we use 64 here for the standard size of struct page, * debugging options may cause it to be larger in which case the * implementation will limit the pfns advertised through * ->direct_access() to those that are included in the memmap. */ start = nsio->res.start; size = resource_size(&nsio->res); npfns = PHYS_PFN(size - SZ_8K); align = max(nd_pfn->align, memremap_compat_align()); /* * When @start is misaligned fail namespace creation. See * the 'struct nd_pfn_sb' commentary on why ->start_pad is not * an option. */ if (!IS_ALIGNED(start, memremap_compat_align())) { dev_err(&nd_pfn->dev, "%s: start %pa misaligned to %#lx\n", dev_name(&ndns->dev), &start, memremap_compat_align()); return -EINVAL; } end_trunc = start + size - ALIGN_DOWN(start + size, align); if (nd_pfn->mode == PFN_MODE_PMEM) { /* * The altmap should be padded out to the block size used * when populating the vmemmap. This *should* be equal to * PMD_SIZE for most architectures. * * Also make sure size of struct page is less than 64. We * want to make sure we use large enough size here so that * we don't have a dynamic reserve space depending on * struct page size. But we also want to make sure we notice * when we end up adding new elements to struct page. */ BUILD_BUG_ON(sizeof(struct page) > MAX_STRUCT_PAGE_SIZE); offset = ALIGN(start + SZ_8K + MAX_STRUCT_PAGE_SIZE * npfns, align) - start; } else if (nd_pfn->mode == PFN_MODE_RAM) offset = ALIGN(start + SZ_8K, align) - start; else return -ENXIO; if (offset >= size) { dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n", dev_name(&ndns->dev)); return -ENXIO; } npfns = PHYS_PFN(size - offset - end_trunc); pfn_sb->mode = cpu_to_le32(nd_pfn->mode); pfn_sb->dataoff = cpu_to_le64(offset); pfn_sb->npfns = cpu_to_le64(npfns); memcpy(pfn_sb->signature, sig, PFN_SIG_LEN); memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); pfn_sb->version_major = cpu_to_le16(1); pfn_sb->version_minor = cpu_to_le16(4); pfn_sb->end_trunc = cpu_to_le32(end_trunc); pfn_sb->align = cpu_to_le32(nd_pfn->align); pfn_sb->page_struct_size = cpu_to_le16(MAX_STRUCT_PAGE_SIZE); pfn_sb->page_size = cpu_to_le32(PAGE_SIZE); checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); pfn_sb->checksum = cpu_to_le64(checksum); rc = nd_pfn_clear_memmap_errors(nd_pfn); if (rc) return rc; return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0); } /* * Determine the effective resource range and vmem_altmap from an nd_pfn * instance. */ int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) { int rc; if (!nd_pfn->uuid || !nd_pfn->ndns) return -ENODEV; rc = nd_pfn_init(nd_pfn); if (rc) return rc; /* we need a valid pfn_sb before we can init a dev_pagemap */ return __nvdimm_setup_pfn(nd_pfn, pgmap); } EXPORT_SYMBOL_GPL(nvdimm_setup_pfn);
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