| // 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/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; |
| |
| 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); |
| 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; |
| |
| 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); |
| 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; |
| |
| 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"); |
| 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; |
| |
| 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); |
| 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; |
| |
| 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; |
| } |
| device_unlock(dev); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_ADMIN_RO(resource); |
| |
| 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; |
| |
| 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; |
| } |
| 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); |
| |
| static struct lock_class_key nvdimm_pfn_key; |
| |
| 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); |
| lockdep_set_class(&nd_pfn->dev.mutex, &nvdimm_pfn_key); |
| 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 uuid_t *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 range *range = &pgmap->range; |
| 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), |
| }; |
| |
| *range = (struct range) { |
| .start = nsio->res.start + start_pad, |
| .end = nsio->res.end - end_trunc, |
| }; |
| pgmap->nr_range = 1; |
| 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((range_len(range) - 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 128. 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); |