| /* |
| * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| */ |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/nd.h> |
| #include "nd-core.h" |
| #include "nd.h" |
| |
| static void namespace_io_release(struct device *dev) |
| { |
| struct nd_namespace_io *nsio = to_nd_namespace_io(dev); |
| |
| kfree(nsio); |
| } |
| |
| static void namespace_pmem_release(struct device *dev) |
| { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| kfree(nspm->alt_name); |
| kfree(nspm->uuid); |
| kfree(nspm); |
| } |
| |
| static void namespace_blk_release(struct device *dev) |
| { |
| /* TODO: blk namespace support */ |
| } |
| |
| static struct device_type namespace_io_device_type = { |
| .name = "nd_namespace_io", |
| .release = namespace_io_release, |
| }; |
| |
| static struct device_type namespace_pmem_device_type = { |
| .name = "nd_namespace_pmem", |
| .release = namespace_pmem_release, |
| }; |
| |
| static struct device_type namespace_blk_device_type = { |
| .name = "nd_namespace_blk", |
| .release = namespace_blk_release, |
| }; |
| |
| static bool is_namespace_pmem(struct device *dev) |
| { |
| return dev ? dev->type == &namespace_pmem_device_type : false; |
| } |
| |
| static bool is_namespace_blk(struct device *dev) |
| { |
| return dev ? dev->type == &namespace_blk_device_type : false; |
| } |
| |
| static bool is_namespace_io(struct device *dev) |
| { |
| return dev ? dev->type == &namespace_io_device_type : false; |
| } |
| |
| static ssize_t nstype_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev->parent); |
| |
| return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); |
| } |
| static DEVICE_ATTR_RO(nstype); |
| |
| static ssize_t __alt_name_store(struct device *dev, const char *buf, |
| const size_t len) |
| { |
| char *input, *pos, *alt_name, **ns_altname; |
| ssize_t rc; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| ns_altname = &nspm->alt_name; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } else |
| return -ENXIO; |
| |
| if (dev->driver) |
| return -EBUSY; |
| |
| input = kmemdup(buf, len + 1, GFP_KERNEL); |
| if (!input) |
| return -ENOMEM; |
| |
| input[len] = '\0'; |
| pos = strim(input); |
| if (strlen(pos) + 1 > NSLABEL_NAME_LEN) { |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL); |
| if (!alt_name) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| kfree(*ns_altname); |
| *ns_altname = alt_name; |
| sprintf(*ns_altname, "%s", pos); |
| rc = len; |
| |
| out: |
| kfree(input); |
| return rc; |
| } |
| |
| static ssize_t alt_name_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| ssize_t rc; |
| |
| device_lock(dev); |
| nvdimm_bus_lock(dev); |
| wait_nvdimm_bus_probe_idle(dev); |
| rc = __alt_name_store(dev, buf, len); |
| dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc); |
| nvdimm_bus_unlock(dev); |
| device_unlock(dev); |
| |
| return rc; |
| } |
| |
| static ssize_t alt_name_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| char *ns_altname; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| ns_altname = nspm->alt_name; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } else |
| return -ENXIO; |
| |
| return sprintf(buf, "%s\n", ns_altname ? ns_altname : ""); |
| } |
| static DEVICE_ATTR_RW(alt_name); |
| |
| static int scan_free(struct nd_region *nd_region, |
| struct nd_mapping *nd_mapping, struct nd_label_id *label_id, |
| resource_size_t n) |
| { |
| bool is_blk = strncmp(label_id->id, "blk", 3) == 0; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| int rc = 0; |
| |
| while (n) { |
| struct resource *res, *last; |
| resource_size_t new_start; |
| |
| last = NULL; |
| for_each_dpa_resource(ndd, res) |
| if (strcmp(res->name, label_id->id) == 0) |
| last = res; |
| res = last; |
| if (!res) |
| return 0; |
| |
| if (n >= resource_size(res)) { |
| n -= resource_size(res); |
| nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc); |
| nvdimm_free_dpa(ndd, res); |
| /* retry with last resource deleted */ |
| continue; |
| } |
| |
| /* |
| * Keep BLK allocations relegated to high DPA as much as |
| * possible |
| */ |
| if (is_blk) |
| new_start = res->start + n; |
| else |
| new_start = res->start; |
| |
| rc = adjust_resource(res, new_start, resource_size(res) - n); |
| nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /** |
| * shrink_dpa_allocation - for each dimm in region free n bytes for label_id |
| * @nd_region: the set of dimms to reclaim @n bytes from |
| * @label_id: unique identifier for the namespace consuming this dpa range |
| * @n: number of bytes per-dimm to release |
| * |
| * Assumes resources are ordered. Starting from the end try to |
| * adjust_resource() the allocation to @n, but if @n is larger than the |
| * allocation delete it and find the 'new' last allocation in the label |
| * set. |
| */ |
| static int shrink_dpa_allocation(struct nd_region *nd_region, |
| struct nd_label_id *label_id, resource_size_t n) |
| { |
| int i; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| int rc; |
| |
| rc = scan_free(nd_region, nd_mapping, label_id, n); |
| if (rc) |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static resource_size_t init_dpa_allocation(struct nd_label_id *label_id, |
| struct nd_region *nd_region, struct nd_mapping *nd_mapping, |
| resource_size_t n) |
| { |
| bool is_blk = strncmp(label_id->id, "blk", 3) == 0; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| resource_size_t first_dpa; |
| struct resource *res; |
| int rc = 0; |
| |
| /* allocate blk from highest dpa first */ |
| if (is_blk) |
| first_dpa = nd_mapping->start + nd_mapping->size - n; |
| else |
| first_dpa = nd_mapping->start; |
| |
| /* first resource allocation for this label-id or dimm */ |
| res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n); |
| if (!res) |
| rc = -EBUSY; |
| |
| nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc); |
| return rc ? n : 0; |
| } |
| |
| static bool space_valid(bool is_pmem, struct nd_label_id *label_id, |
| struct resource *res) |
| { |
| /* |
| * For BLK-space any space is valid, for PMEM-space, it must be |
| * contiguous with an existing allocation. |
| */ |
| if (!is_pmem) |
| return true; |
| if (!res || strcmp(res->name, label_id->id) == 0) |
| return true; |
| return false; |
| } |
| |
| enum alloc_loc { |
| ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER, |
| }; |
| |
| static resource_size_t scan_allocate(struct nd_region *nd_region, |
| struct nd_mapping *nd_mapping, struct nd_label_id *label_id, |
| resource_size_t n) |
| { |
| resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1; |
| bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| const resource_size_t to_allocate = n; |
| struct resource *res; |
| int first; |
| |
| retry: |
| first = 0; |
| for_each_dpa_resource(ndd, res) { |
| resource_size_t allocate, available = 0, free_start, free_end; |
| struct resource *next = res->sibling, *new_res = NULL; |
| enum alloc_loc loc = ALLOC_ERR; |
| const char *action; |
| int rc = 0; |
| |
| /* ignore resources outside this nd_mapping */ |
| if (res->start > mapping_end) |
| continue; |
| if (res->end < nd_mapping->start) |
| continue; |
| |
| /* space at the beginning of the mapping */ |
| if (!first++ && res->start > nd_mapping->start) { |
| free_start = nd_mapping->start; |
| available = res->start - free_start; |
| if (space_valid(is_pmem, label_id, NULL)) |
| loc = ALLOC_BEFORE; |
| } |
| |
| /* space between allocations */ |
| if (!loc && next) { |
| free_start = res->start + resource_size(res); |
| free_end = min(mapping_end, next->start - 1); |
| if (space_valid(is_pmem, label_id, res) |
| && free_start < free_end) { |
| available = free_end + 1 - free_start; |
| loc = ALLOC_MID; |
| } |
| } |
| |
| /* space at the end of the mapping */ |
| if (!loc && !next) { |
| free_start = res->start + resource_size(res); |
| free_end = mapping_end; |
| if (space_valid(is_pmem, label_id, res) |
| && free_start < free_end) { |
| available = free_end + 1 - free_start; |
| loc = ALLOC_AFTER; |
| } |
| } |
| |
| if (!loc || !available) |
| continue; |
| allocate = min(available, n); |
| switch (loc) { |
| case ALLOC_BEFORE: |
| if (strcmp(res->name, label_id->id) == 0) { |
| /* adjust current resource up */ |
| if (is_pmem) |
| return n; |
| rc = adjust_resource(res, res->start - allocate, |
| resource_size(res) + allocate); |
| action = "cur grow up"; |
| } else |
| action = "allocate"; |
| break; |
| case ALLOC_MID: |
| if (strcmp(next->name, label_id->id) == 0) { |
| /* adjust next resource up */ |
| if (is_pmem) |
| return n; |
| rc = adjust_resource(next, next->start |
| - allocate, resource_size(next) |
| + allocate); |
| new_res = next; |
| action = "next grow up"; |
| } else if (strcmp(res->name, label_id->id) == 0) { |
| action = "grow down"; |
| } else |
| action = "allocate"; |
| break; |
| case ALLOC_AFTER: |
| if (strcmp(res->name, label_id->id) == 0) |
| action = "grow down"; |
| else |
| action = "allocate"; |
| break; |
| default: |
| return n; |
| } |
| |
| if (strcmp(action, "allocate") == 0) { |
| /* BLK allocate bottom up */ |
| if (!is_pmem) |
| free_start += available - allocate; |
| else if (free_start != nd_mapping->start) |
| return n; |
| |
| new_res = nvdimm_allocate_dpa(ndd, label_id, |
| free_start, allocate); |
| if (!new_res) |
| rc = -EBUSY; |
| } else if (strcmp(action, "grow down") == 0) { |
| /* adjust current resource down */ |
| rc = adjust_resource(res, res->start, resource_size(res) |
| + allocate); |
| } |
| |
| if (!new_res) |
| new_res = res; |
| |
| nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n", |
| action, loc, rc); |
| |
| if (rc) |
| return n; |
| |
| n -= allocate; |
| if (n) { |
| /* |
| * Retry scan with newly inserted resources. |
| * For example, if we did an ALLOC_BEFORE |
| * insertion there may also have been space |
| * available for an ALLOC_AFTER insertion, so we |
| * need to check this same resource again |
| */ |
| goto retry; |
| } else |
| return 0; |
| } |
| |
| if (is_pmem && n == to_allocate) |
| return init_dpa_allocation(label_id, nd_region, nd_mapping, n); |
| return n; |
| } |
| |
| /** |
| * grow_dpa_allocation - for each dimm allocate n bytes for @label_id |
| * @nd_region: the set of dimms to allocate @n more bytes from |
| * @label_id: unique identifier for the namespace consuming this dpa range |
| * @n: number of bytes per-dimm to add to the existing allocation |
| * |
| * Assumes resources are ordered. For BLK regions, first consume |
| * BLK-only available DPA free space, then consume PMEM-aliased DPA |
| * space starting at the highest DPA. For PMEM regions start |
| * allocations from the start of an interleave set and end at the first |
| * BLK allocation or the end of the interleave set, whichever comes |
| * first. |
| */ |
| static int grow_dpa_allocation(struct nd_region *nd_region, |
| struct nd_label_id *label_id, resource_size_t n) |
| { |
| int i; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| int rc; |
| |
| rc = scan_allocate(nd_region, nd_mapping, label_id, n); |
| if (rc) |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static void nd_namespace_pmem_set_size(struct nd_region *nd_region, |
| struct nd_namespace_pmem *nspm, resource_size_t size) |
| { |
| struct resource *res = &nspm->nsio.res; |
| |
| res->start = nd_region->ndr_start; |
| res->end = nd_region->ndr_start + size - 1; |
| } |
| |
| static ssize_t __size_store(struct device *dev, unsigned long long val) |
| { |
| resource_size_t allocated = 0, available = 0; |
| struct nd_region *nd_region = to_nd_region(dev->parent); |
| struct nd_mapping *nd_mapping; |
| struct nvdimm_drvdata *ndd; |
| struct nd_label_id label_id; |
| u32 flags = 0, remainder; |
| u8 *uuid = NULL; |
| int rc, i; |
| |
| if (dev->driver) |
| return -EBUSY; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| uuid = nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } |
| |
| /* |
| * We need a uuid for the allocation-label and dimm(s) on which |
| * to store the label. |
| */ |
| if (!uuid || nd_region->ndr_mappings == 0) |
| return -ENXIO; |
| |
| div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder); |
| if (remainder) { |
| dev_dbg(dev, "%llu is not %dK aligned\n", val, |
| (SZ_4K * nd_region->ndr_mappings) / SZ_1K); |
| return -EINVAL; |
| } |
| |
| nd_label_gen_id(&label_id, uuid, flags); |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| nd_mapping = &nd_region->mapping[i]; |
| ndd = to_ndd(nd_mapping); |
| |
| /* |
| * All dimms in an interleave set, or the base dimm for a blk |
| * region, need to be enabled for the size to be changed. |
| */ |
| if (!ndd) |
| return -ENXIO; |
| |
| allocated += nvdimm_allocated_dpa(ndd, &label_id); |
| } |
| available = nd_region_available_dpa(nd_region); |
| |
| if (val > available + allocated) |
| return -ENOSPC; |
| |
| if (val == allocated) |
| return 0; |
| |
| val = div_u64(val, nd_region->ndr_mappings); |
| allocated = div_u64(allocated, nd_region->ndr_mappings); |
| if (val < allocated) |
| rc = shrink_dpa_allocation(nd_region, &label_id, |
| allocated - val); |
| else |
| rc = grow_dpa_allocation(nd_region, &label_id, val - allocated); |
| |
| if (rc) |
| return rc; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| nd_namespace_pmem_set_size(nd_region, nspm, |
| val * nd_region->ndr_mappings); |
| } |
| |
| return rc; |
| } |
| |
| static ssize_t size_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| unsigned long long val; |
| u8 **uuid = NULL; |
| int rc; |
| |
| rc = kstrtoull(buf, 0, &val); |
| if (rc) |
| return rc; |
| |
| device_lock(dev); |
| nvdimm_bus_lock(dev); |
| wait_nvdimm_bus_probe_idle(dev); |
| rc = __size_store(dev, val); |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| uuid = &nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| rc = -ENXIO; |
| } |
| |
| if (rc == 0 && val == 0 && uuid) { |
| /* setting size zero == 'delete namespace' */ |
| kfree(*uuid); |
| *uuid = NULL; |
| } |
| |
| dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0 |
| ? "fail" : "success", rc); |
| |
| nvdimm_bus_unlock(dev); |
| device_unlock(dev); |
| |
| return rc ? rc : len; |
| } |
| |
| static ssize_t size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| return sprintf(buf, "%llu\n", (unsigned long long) |
| resource_size(&nspm->nsio.res)); |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } else if (is_namespace_io(dev)) { |
| struct nd_namespace_io *nsio = to_nd_namespace_io(dev); |
| |
| return sprintf(buf, "%llu\n", (unsigned long long) |
| resource_size(&nsio->res)); |
| } else |
| return -ENXIO; |
| } |
| static DEVICE_ATTR(size, S_IRUGO, size_show, size_store); |
| |
| static ssize_t uuid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| u8 *uuid; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| uuid = nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } else |
| return -ENXIO; |
| |
| if (uuid) |
| return sprintf(buf, "%pUb\n", uuid); |
| return sprintf(buf, "\n"); |
| } |
| |
| /** |
| * namespace_update_uuid - check for a unique uuid and whether we're "renaming" |
| * @nd_region: parent region so we can updates all dimms in the set |
| * @dev: namespace type for generating label_id |
| * @new_uuid: incoming uuid |
| * @old_uuid: reference to the uuid storage location in the namespace object |
| */ |
| static int namespace_update_uuid(struct nd_region *nd_region, |
| struct device *dev, u8 *new_uuid, u8 **old_uuid) |
| { |
| u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0; |
| struct nd_label_id old_label_id; |
| struct nd_label_id new_label_id; |
| int i, rc; |
| |
| rc = nd_is_uuid_unique(dev, new_uuid) ? 0 : -EINVAL; |
| if (rc) { |
| kfree(new_uuid); |
| return rc; |
| } |
| |
| if (*old_uuid == NULL) |
| goto out; |
| |
| nd_label_gen_id(&old_label_id, *old_uuid, flags); |
| nd_label_gen_id(&new_label_id, new_uuid, flags); |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| struct resource *res; |
| |
| for_each_dpa_resource(ndd, res) |
| if (strcmp(res->name, old_label_id.id) == 0) |
| sprintf((void *) res->name, "%s", |
| new_label_id.id); |
| } |
| kfree(*old_uuid); |
| out: |
| *old_uuid = new_uuid; |
| return 0; |
| } |
| |
| static ssize_t uuid_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| struct nd_region *nd_region = to_nd_region(dev->parent); |
| u8 *uuid = NULL; |
| u8 **ns_uuid; |
| ssize_t rc; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| ns_uuid = &nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| /* TODO: blk namespace support */ |
| return -ENXIO; |
| } else |
| return -ENXIO; |
| |
| device_lock(dev); |
| nvdimm_bus_lock(dev); |
| wait_nvdimm_bus_probe_idle(dev); |
| rc = nd_uuid_store(dev, &uuid, buf, len); |
| if (rc >= 0) |
| rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid); |
| dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, |
| rc, buf, buf[len - 1] == '\n' ? "" : "\n"); |
| nvdimm_bus_unlock(dev); |
| device_unlock(dev); |
| |
| return rc ? rc : len; |
| } |
| static DEVICE_ATTR_RW(uuid); |
| |
| static ssize_t resource_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct resource *res; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| res = &nspm->nsio.res; |
| } else if (is_namespace_io(dev)) { |
| struct nd_namespace_io *nsio = to_nd_namespace_io(dev); |
| |
| res = &nsio->res; |
| } else |
| return -ENXIO; |
| |
| /* no address to convey if the namespace has no allocation */ |
| if (resource_size(res) == 0) |
| return -ENXIO; |
| return sprintf(buf, "%#llx\n", (unsigned long long) res->start); |
| } |
| static DEVICE_ATTR_RO(resource); |
| |
| static struct attribute *nd_namespace_attributes[] = { |
| &dev_attr_nstype.attr, |
| &dev_attr_size.attr, |
| &dev_attr_uuid.attr, |
| &dev_attr_resource.attr, |
| &dev_attr_alt_name.attr, |
| NULL, |
| }; |
| |
| static umode_t namespace_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| |
| if (a == &dev_attr_resource.attr) { |
| if (is_namespace_blk(dev)) |
| return 0; |
| return a->mode; |
| } |
| |
| if (is_namespace_pmem(dev) || is_namespace_blk(dev)) { |
| if (a == &dev_attr_size.attr) |
| return S_IWUSR | S_IRUGO; |
| return a->mode; |
| } |
| |
| if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr) |
| return a->mode; |
| |
| return 0; |
| } |
| |
| static struct attribute_group nd_namespace_attribute_group = { |
| .attrs = nd_namespace_attributes, |
| .is_visible = namespace_visible, |
| }; |
| |
| static const struct attribute_group *nd_namespace_attribute_groups[] = { |
| &nd_device_attribute_group, |
| &nd_namespace_attribute_group, |
| NULL, |
| }; |
| |
| static struct device **create_namespace_io(struct nd_region *nd_region) |
| { |
| struct nd_namespace_io *nsio; |
| struct device *dev, **devs; |
| struct resource *res; |
| |
| nsio = kzalloc(sizeof(*nsio), GFP_KERNEL); |
| if (!nsio) |
| return NULL; |
| |
| devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL); |
| if (!devs) { |
| kfree(nsio); |
| return NULL; |
| } |
| |
| dev = &nsio->dev; |
| dev->type = &namespace_io_device_type; |
| dev->parent = &nd_region->dev; |
| res = &nsio->res; |
| res->name = dev_name(&nd_region->dev); |
| res->flags = IORESOURCE_MEM; |
| res->start = nd_region->ndr_start; |
| res->end = res->start + nd_region->ndr_size - 1; |
| |
| devs[0] = dev; |
| return devs; |
| } |
| |
| static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid, |
| u64 cookie, u16 pos) |
| { |
| struct nd_namespace_label *found = NULL; |
| int i; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nd_namespace_label *nd_label; |
| bool found_uuid = false; |
| int l; |
| |
| for_each_label(l, nd_label, nd_mapping->labels) { |
| u64 isetcookie = __le64_to_cpu(nd_label->isetcookie); |
| u16 position = __le16_to_cpu(nd_label->position); |
| u16 nlabel = __le16_to_cpu(nd_label->nlabel); |
| |
| if (isetcookie != cookie) |
| continue; |
| |
| if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0) |
| continue; |
| |
| if (found_uuid) { |
| dev_dbg(to_ndd(nd_mapping)->dev, |
| "%s duplicate entry for uuid\n", |
| __func__); |
| return false; |
| } |
| found_uuid = true; |
| if (nlabel != nd_region->ndr_mappings) |
| continue; |
| if (position != pos) |
| continue; |
| found = nd_label; |
| break; |
| } |
| if (found) |
| break; |
| } |
| return found != NULL; |
| } |
| |
| static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id) |
| { |
| struct nd_namespace_label *select = NULL; |
| int i; |
| |
| if (!pmem_id) |
| return -ENODEV; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nd_namespace_label *nd_label; |
| u64 hw_start, hw_end, pmem_start, pmem_end; |
| int l; |
| |
| for_each_label(l, nd_label, nd_mapping->labels) |
| if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0) |
| break; |
| |
| if (!nd_label) { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| |
| select = nd_label; |
| /* |
| * Check that this label is compliant with the dpa |
| * range published in NFIT |
| */ |
| hw_start = nd_mapping->start; |
| hw_end = hw_start + nd_mapping->size; |
| pmem_start = __le64_to_cpu(select->dpa); |
| pmem_end = pmem_start + __le64_to_cpu(select->rawsize); |
| if (pmem_start == hw_start && pmem_end <= hw_end) |
| /* pass */; |
| else |
| return -EINVAL; |
| |
| nd_mapping->labels[0] = select; |
| nd_mapping->labels[1] = NULL; |
| } |
| return 0; |
| } |
| |
| /** |
| * find_pmem_label_set - validate interleave set labelling, retrieve label0 |
| * @nd_region: region with mappings to validate |
| */ |
| static int find_pmem_label_set(struct nd_region *nd_region, |
| struct nd_namespace_pmem *nspm) |
| { |
| u64 cookie = nd_region_interleave_set_cookie(nd_region); |
| struct nd_namespace_label *nd_label; |
| u8 select_id[NSLABEL_UUID_LEN]; |
| resource_size_t size = 0; |
| u8 *pmem_id = NULL; |
| int rc = -ENODEV, l; |
| u16 i; |
| |
| if (cookie == 0) |
| return -ENXIO; |
| |
| /* |
| * Find a complete set of labels by uuid. By definition we can start |
| * with any mapping as the reference label |
| */ |
| for_each_label(l, nd_label, nd_region->mapping[0].labels) { |
| u64 isetcookie = __le64_to_cpu(nd_label->isetcookie); |
| |
| if (isetcookie != cookie) |
| continue; |
| |
| for (i = 0; nd_region->ndr_mappings; i++) |
| if (!has_uuid_at_pos(nd_region, nd_label->uuid, |
| cookie, i)) |
| break; |
| if (i < nd_region->ndr_mappings) { |
| /* |
| * Give up if we don't find an instance of a |
| * uuid at each position (from 0 to |
| * nd_region->ndr_mappings - 1), or if we find a |
| * dimm with two instances of the same uuid. |
| */ |
| rc = -EINVAL; |
| goto err; |
| } else if (pmem_id) { |
| /* |
| * If there is more than one valid uuid set, we |
| * need userspace to clean this up. |
| */ |
| rc = -EBUSY; |
| goto err; |
| } |
| memcpy(select_id, nd_label->uuid, NSLABEL_UUID_LEN); |
| pmem_id = select_id; |
| } |
| |
| /* |
| * Fix up each mapping's 'labels' to have the validated pmem label for |
| * that position at labels[0], and NULL at labels[1]. In the process, |
| * check that the namespace aligns with interleave-set. We know |
| * that it does not overlap with any blk namespaces by virtue of |
| * the dimm being enabled (i.e. nd_label_reserve_dpa() |
| * succeeded). |
| */ |
| rc = select_pmem_id(nd_region, pmem_id); |
| if (rc) |
| goto err; |
| |
| /* Calculate total size and populate namespace properties from label0 */ |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nd_namespace_label *label0 = nd_mapping->labels[0]; |
| |
| size += __le64_to_cpu(label0->rawsize); |
| if (__le16_to_cpu(label0->position) != 0) |
| continue; |
| WARN_ON(nspm->alt_name || nspm->uuid); |
| nspm->alt_name = kmemdup((void __force *) label0->name, |
| NSLABEL_NAME_LEN, GFP_KERNEL); |
| nspm->uuid = kmemdup((void __force *) label0->uuid, |
| NSLABEL_UUID_LEN, GFP_KERNEL); |
| } |
| |
| if (!nspm->alt_name || !nspm->uuid) { |
| rc = -ENOMEM; |
| goto err; |
| } |
| |
| nd_namespace_pmem_set_size(nd_region, nspm, size); |
| |
| return 0; |
| err: |
| switch (rc) { |
| case -EINVAL: |
| dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__); |
| break; |
| case -ENODEV: |
| dev_dbg(&nd_region->dev, "%s: label not found\n", __func__); |
| break; |
| default: |
| dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n", |
| __func__, rc); |
| break; |
| } |
| return rc; |
| } |
| |
| static struct device **create_namespace_pmem(struct nd_region *nd_region) |
| { |
| struct nd_namespace_pmem *nspm; |
| struct device *dev, **devs; |
| struct resource *res; |
| int rc; |
| |
| nspm = kzalloc(sizeof(*nspm), GFP_KERNEL); |
| if (!nspm) |
| return NULL; |
| |
| dev = &nspm->nsio.dev; |
| dev->type = &namespace_pmem_device_type; |
| dev->parent = &nd_region->dev; |
| res = &nspm->nsio.res; |
| res->name = dev_name(&nd_region->dev); |
| res->flags = IORESOURCE_MEM; |
| rc = find_pmem_label_set(nd_region, nspm); |
| if (rc == -ENODEV) { |
| int i; |
| |
| /* Pass, try to permit namespace creation... */ |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| |
| kfree(nd_mapping->labels); |
| nd_mapping->labels = NULL; |
| } |
| |
| /* Publish a zero-sized namespace for userspace to configure. */ |
| nd_namespace_pmem_set_size(nd_region, nspm, 0); |
| |
| rc = 0; |
| } else if (rc) |
| goto err; |
| |
| devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL); |
| if (!devs) |
| goto err; |
| |
| devs[0] = dev; |
| return devs; |
| |
| err: |
| namespace_pmem_release(&nspm->nsio.dev); |
| return NULL; |
| } |
| |
| static int init_active_labels(struct nd_region *nd_region) |
| { |
| int i; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| int count, j; |
| |
| /* |
| * If the dimm is disabled then prevent the region from |
| * being activated if it aliases DPA. |
| */ |
| if (!ndd) { |
| if ((nvdimm->flags & NDD_ALIASING) == 0) |
| return 0; |
| dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n", |
| dev_name(&nd_mapping->nvdimm->dev)); |
| return -ENXIO; |
| } |
| nd_mapping->ndd = ndd; |
| atomic_inc(&nvdimm->busy); |
| get_ndd(ndd); |
| |
| count = nd_label_active_count(ndd); |
| dev_dbg(ndd->dev, "%s: %d\n", __func__, count); |
| if (!count) |
| continue; |
| nd_mapping->labels = kcalloc(count + 1, sizeof(void *), |
| GFP_KERNEL); |
| if (!nd_mapping->labels) |
| return -ENOMEM; |
| for (j = 0; j < count; j++) { |
| struct nd_namespace_label *label; |
| |
| label = nd_label_active(ndd, j); |
| nd_mapping->labels[j] = label; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int nd_region_register_namespaces(struct nd_region *nd_region, int *err) |
| { |
| struct device **devs = NULL; |
| int i, rc = 0, type; |
| |
| *err = 0; |
| nvdimm_bus_lock(&nd_region->dev); |
| rc = init_active_labels(nd_region); |
| if (rc) { |
| nvdimm_bus_unlock(&nd_region->dev); |
| return rc; |
| } |
| |
| type = nd_region_to_nstype(nd_region); |
| switch (type) { |
| case ND_DEVICE_NAMESPACE_IO: |
| devs = create_namespace_io(nd_region); |
| break; |
| case ND_DEVICE_NAMESPACE_PMEM: |
| devs = create_namespace_pmem(nd_region); |
| break; |
| default: |
| break; |
| } |
| nvdimm_bus_unlock(&nd_region->dev); |
| |
| if (!devs) |
| return -ENODEV; |
| |
| nd_region->ns_seed = devs[0]; |
| for (i = 0; devs[i]; i++) { |
| struct device *dev = devs[i]; |
| |
| dev_set_name(dev, "namespace%d.%d", nd_region->id, i); |
| dev->groups = nd_namespace_attribute_groups; |
| nd_device_register(dev); |
| } |
| kfree(devs); |
| |
| return i; |
| } |