diff options
Diffstat (limited to 'drivers/nvdimm/dimm_devs.c')
| -rw-r--r-- | drivers/nvdimm/dimm_devs.c | 717 |
1 files changed, 717 insertions, 0 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c new file mode 100644 index 000000000..f0e0e3b42 --- /dev/null +++ b/drivers/nvdimm/dimm_devs.c @@ -0,0 +1,717 @@ +/* + * 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. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/vmalloc.h> +#include <linux/device.h> +#include <linux/ndctl.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include "nd-core.h" +#include "label.h" +#include "pmem.h" +#include "nd.h" + +static DEFINE_IDA(dimm_ida); + +/* + * Retrieve bus and dimm handle and return if this bus supports + * get_config_data commands + */ +int nvdimm_check_config_data(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + if (!nvdimm->cmd_mask || + !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) { + if (test_bit(NDD_ALIASING, &nvdimm->flags)) + return -ENXIO; + else + return -ENOTTY; + } + + return 0; +} + +static int validate_dimm(struct nvdimm_drvdata *ndd) +{ + int rc; + + if (!ndd) + return -EINVAL; + + rc = nvdimm_check_config_data(ndd->dev); + if (rc) + dev_dbg(ndd->dev, "%pf: %s error: %d\n", + __builtin_return_address(0), __func__, rc); + return rc; +} + +/** + * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area + * @nvdimm: dimm to initialize + */ +int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd) +{ + struct nd_cmd_get_config_size *cmd = &ndd->nsarea; + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); + struct nvdimm_bus_descriptor *nd_desc; + int rc = validate_dimm(ndd); + int cmd_rc = 0; + + if (rc) + return rc; + + if (cmd->config_size) + return 0; /* already valid */ + + memset(cmd, 0, sizeof(*cmd)); + nd_desc = nvdimm_bus->nd_desc; + rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), + ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc); + if (rc < 0) + return rc; + return cmd_rc; +} + +int nvdimm_init_config_data(struct nvdimm_drvdata *ndd) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); + int rc = validate_dimm(ndd), cmd_rc = 0; + struct nd_cmd_get_config_data_hdr *cmd; + struct nvdimm_bus_descriptor *nd_desc; + u32 max_cmd_size, config_size; + size_t offset; + + if (rc) + return rc; + + if (ndd->data) + return 0; + + if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0 + || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) { + dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n", + ndd->nsarea.max_xfer, ndd->nsarea.config_size); + return -ENXIO; + } + + ndd->data = kvmalloc(ndd->nsarea.config_size, GFP_KERNEL); + if (!ndd->data) + return -ENOMEM; + + max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer); + cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + nd_desc = nvdimm_bus->nd_desc; + for (config_size = ndd->nsarea.config_size, offset = 0; + config_size; config_size -= cmd->in_length, + offset += cmd->in_length) { + cmd->in_length = min(config_size, max_cmd_size); + cmd->in_offset = offset; + rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), + ND_CMD_GET_CONFIG_DATA, cmd, + cmd->in_length + sizeof(*cmd), &cmd_rc); + if (rc < 0) + break; + if (cmd_rc < 0) { + rc = cmd_rc; + break; + } + memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length); + } + dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc); + kfree(cmd); + + return rc; +} + +int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, + void *buf, size_t len) +{ + size_t max_cmd_size, buf_offset; + struct nd_cmd_set_config_hdr *cmd; + int rc = validate_dimm(ndd), cmd_rc = 0; + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + + if (rc) + return rc; + + if (!ndd->data) + return -ENXIO; + + if (offset + len > ndd->nsarea.config_size) + return -ENXIO; + + max_cmd_size = min_t(u32, PAGE_SIZE, len); + max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer); + cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + for (buf_offset = 0; len; len -= cmd->in_length, + buf_offset += cmd->in_length) { + size_t cmd_size; + + cmd->in_offset = offset + buf_offset; + cmd->in_length = min(max_cmd_size, len); + memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length); + + /* status is output in the last 4-bytes of the command buffer */ + cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32); + + rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), + ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc); + if (rc < 0) + break; + if (cmd_rc < 0) { + rc = cmd_rc; + break; + } + } + kfree(cmd); + + return rc; +} + +void nvdimm_set_aliasing(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + set_bit(NDD_ALIASING, &nvdimm->flags); +} + +void nvdimm_set_locked(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + set_bit(NDD_LOCKED, &nvdimm->flags); +} + +void nvdimm_clear_locked(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + clear_bit(NDD_LOCKED, &nvdimm->flags); +} + +static void nvdimm_release(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + ida_simple_remove(&dimm_ida, nvdimm->id); + kfree(nvdimm); +} + +static struct device_type nvdimm_device_type = { + .name = "nvdimm", + .release = nvdimm_release, +}; + +bool is_nvdimm(struct device *dev) +{ + return dev->type == &nvdimm_device_type; +} + +struct nvdimm *to_nvdimm(struct device *dev) +{ + struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev); + + WARN_ON(!is_nvdimm(dev)); + return nvdimm; +} +EXPORT_SYMBOL_GPL(to_nvdimm); + +struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr) +{ + struct nd_region *nd_region = &ndbr->nd_region; + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + + return nd_mapping->nvdimm; +} +EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm); + +unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr) +{ + /* pmem mapping properties are private to libnvdimm */ + return ARCH_MEMREMAP_PMEM; +} +EXPORT_SYMBOL_GPL(nd_blk_memremap_flags); + +struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping) +{ + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); + + return dev_get_drvdata(&nvdimm->dev); +} +EXPORT_SYMBOL(to_ndd); + +void nvdimm_drvdata_release(struct kref *kref) +{ + struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref); + struct device *dev = ndd->dev; + struct resource *res, *_r; + + dev_dbg(dev, "trace\n"); + nvdimm_bus_lock(dev); + for_each_dpa_resource_safe(ndd, res, _r) + nvdimm_free_dpa(ndd, res); + nvdimm_bus_unlock(dev); + + kvfree(ndd->data); + kfree(ndd); + put_device(dev); +} + +void get_ndd(struct nvdimm_drvdata *ndd) +{ + kref_get(&ndd->kref); +} + +void put_ndd(struct nvdimm_drvdata *ndd) +{ + if (ndd) + kref_put(&ndd->kref, nvdimm_drvdata_release); +} + +const char *nvdimm_name(struct nvdimm *nvdimm) +{ + return dev_name(&nvdimm->dev); +} +EXPORT_SYMBOL_GPL(nvdimm_name); + +struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) +{ + return &nvdimm->dev.kobj; +} +EXPORT_SYMBOL_GPL(nvdimm_kobj); + +unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) +{ + return nvdimm->cmd_mask; +} +EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); + +void *nvdimm_provider_data(struct nvdimm *nvdimm) +{ + if (nvdimm) + return nvdimm->provider_data; + return NULL; +} +EXPORT_SYMBOL_GPL(nvdimm_provider_data); + +static ssize_t commands_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + int cmd, len = 0; + + if (!nvdimm->cmd_mask) + return sprintf(buf, "\n"); + + for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG) + len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd)); + len += sprintf(buf + len, "\n"); + return len; +} +static DEVICE_ATTR_RO(commands); + +static ssize_t flags_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + return sprintf(buf, "%s%s\n", + test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "", + test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : ""); +} +static DEVICE_ATTR_RO(flags); + +static ssize_t state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + + /* + * The state may be in the process of changing, userspace should + * quiesce probing if it wants a static answer + */ + nvdimm_bus_lock(dev); + nvdimm_bus_unlock(dev); + return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy) + ? "active" : "idle"); +} +static DEVICE_ATTR_RO(state); + +static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf) +{ + struct device *dev; + ssize_t rc; + u32 nfree; + + if (!ndd) + return -ENXIO; + + dev = ndd->dev; + nvdimm_bus_lock(dev); + nfree = nd_label_nfree(ndd); + if (nfree - 1 > nfree) { + dev_WARN_ONCE(dev, 1, "we ate our last label?\n"); + nfree = 0; + } else + nfree--; + rc = sprintf(buf, "%d\n", nfree); + nvdimm_bus_unlock(dev); + return rc; +} + +static ssize_t available_slots_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t rc; + + device_lock(dev); + rc = __available_slots_show(dev_get_drvdata(dev), buf); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(available_slots); + +static struct attribute *nvdimm_attributes[] = { + &dev_attr_state.attr, + &dev_attr_flags.attr, + &dev_attr_commands.attr, + &dev_attr_available_slots.attr, + NULL, +}; + +struct attribute_group nvdimm_attribute_group = { + .attrs = nvdimm_attributes, +}; +EXPORT_SYMBOL_GPL(nvdimm_attribute_group); + +struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data, + const struct attribute_group **groups, unsigned long flags, + unsigned long cmd_mask, int num_flush, + struct resource *flush_wpq) +{ + struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL); + struct device *dev; + + if (!nvdimm) + return NULL; + + nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL); + if (nvdimm->id < 0) { + kfree(nvdimm); + return NULL; + } + nvdimm->provider_data = provider_data; + nvdimm->flags = flags; + nvdimm->cmd_mask = cmd_mask; + nvdimm->num_flush = num_flush; + nvdimm->flush_wpq = flush_wpq; + atomic_set(&nvdimm->busy, 0); + dev = &nvdimm->dev; + dev_set_name(dev, "nmem%d", nvdimm->id); + dev->parent = &nvdimm_bus->dev; + dev->type = &nvdimm_device_type; + dev->devt = MKDEV(nvdimm_major, nvdimm->id); + dev->groups = groups; + nd_device_register(dev); + + return nvdimm; +} +EXPORT_SYMBOL_GPL(nvdimm_create); + +int alias_dpa_busy(struct device *dev, void *data) +{ + resource_size_t map_end, blk_start, new; + struct blk_alloc_info *info = data; + struct nd_mapping *nd_mapping; + struct nd_region *nd_region; + struct nvdimm_drvdata *ndd; + struct resource *res; + int i; + + if (!is_memory(dev)) + return 0; + + nd_region = to_nd_region(dev); + for (i = 0; i < nd_region->ndr_mappings; i++) { + nd_mapping = &nd_region->mapping[i]; + if (nd_mapping->nvdimm == info->nd_mapping->nvdimm) + break; + } + + if (i >= nd_region->ndr_mappings) + return 0; + + ndd = to_ndd(nd_mapping); + map_end = nd_mapping->start + nd_mapping->size - 1; + blk_start = nd_mapping->start; + + /* + * In the allocation case ->res is set to free space that we are + * looking to validate against PMEM aliasing collision rules + * (i.e. BLK is allocated after all aliased PMEM). + */ + if (info->res) { + if (info->res->start >= nd_mapping->start + && info->res->start < map_end) + /* pass */; + else + return 0; + } + + retry: + /* + * Find the free dpa from the end of the last pmem allocation to + * the end of the interleave-set mapping. + */ + for_each_dpa_resource(ndd, res) { + if (strncmp(res->name, "pmem", 4) != 0) + continue; + if ((res->start >= blk_start && res->start < map_end) + || (res->end >= blk_start + && res->end <= map_end)) { + new = max(blk_start, min(map_end + 1, res->end + 1)); + if (new != blk_start) { + blk_start = new; + goto retry; + } + } + } + + /* update the free space range with the probed blk_start */ + if (info->res && blk_start > info->res->start) { + info->res->start = max(info->res->start, blk_start); + if (info->res->start > info->res->end) + info->res->end = info->res->start - 1; + return 1; + } + + info->available -= blk_start - nd_mapping->start; + + return 0; +} + +/** + * nd_blk_available_dpa - account the unused dpa of BLK region + * @nd_mapping: container of dpa-resource-root + labels + * + * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but + * we arrange for them to never start at an lower dpa than the last + * PMEM allocation in an aliased region. + */ +resource_size_t nd_blk_available_dpa(struct nd_region *nd_region) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct blk_alloc_info info = { + .nd_mapping = nd_mapping, + .available = nd_mapping->size, + .res = NULL, + }; + struct resource *res; + + if (!ndd) + return 0; + + device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy); + + /* now account for busy blk allocations in unaliased dpa */ + for_each_dpa_resource(ndd, res) { + if (strncmp(res->name, "blk", 3) != 0) + continue; + info.available -= resource_size(res); + } + + return info.available; +} + +/** + * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max + * contiguous unallocated dpa range. + * @nd_region: constrain available space check to this reference region + * @nd_mapping: container of dpa-resource-root + labels + */ +resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region, + struct nd_mapping *nd_mapping) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct nvdimm_bus *nvdimm_bus; + resource_size_t max = 0; + struct resource *res; + + /* if a dimm is disabled the available capacity is zero */ + if (!ndd) + return 0; + + nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); + if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm)) + return 0; + for_each_dpa_resource(ndd, res) { + if (strcmp(res->name, "pmem-reserve") != 0) + continue; + if (resource_size(res) > max) + max = resource_size(res); + } + release_free_pmem(nvdimm_bus, nd_mapping); + return max; +} + +/** + * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa + * @nd_mapping: container of dpa-resource-root + labels + * @nd_region: constrain available space check to this reference region + * @overlap: calculate available space assuming this level of overlap + * + * Validate that a PMEM label, if present, aligns with the start of an + * interleave set and truncate the available size at the lowest BLK + * overlap point. + * + * The expectation is that this routine is called multiple times as it + * probes for the largest BLK encroachment for any single member DIMM of + * the interleave set. Once that value is determined the PMEM-limit for + * the set can be established. + */ +resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, + struct nd_mapping *nd_mapping, resource_size_t *overlap) +{ + resource_size_t map_start, map_end, busy = 0, available, blk_start; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct resource *res; + const char *reason; + + if (!ndd) + return 0; + + map_start = nd_mapping->start; + map_end = map_start + nd_mapping->size - 1; + blk_start = max(map_start, map_end + 1 - *overlap); + for_each_dpa_resource(ndd, res) { + if (res->start >= map_start && res->start < map_end) { + if (strncmp(res->name, "blk", 3) == 0) + blk_start = min(blk_start, + max(map_start, res->start)); + else if (res->end > map_end) { + reason = "misaligned to iset"; + goto err; + } else + busy += resource_size(res); + } else if (res->end >= map_start && res->end <= map_end) { + if (strncmp(res->name, "blk", 3) == 0) { + /* + * If a BLK allocation overlaps the start of + * PMEM the entire interleave set may now only + * be used for BLK. + */ + blk_start = map_start; + } else + busy += resource_size(res); + } else if (map_start > res->start && map_start < res->end) { + /* total eclipse of the mapping */ + busy += nd_mapping->size; + blk_start = map_start; + } + } + + *overlap = map_end + 1 - blk_start; + available = blk_start - map_start; + if (busy < available) + return available - busy; + return 0; + + err: + nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason); + return 0; +} + +void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) +{ + WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); + kfree(res->name); + __release_region(&ndd->dpa, res->start, resource_size(res)); +} + +struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, + struct nd_label_id *label_id, resource_size_t start, + resource_size_t n) +{ + char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); + struct resource *res; + + if (!name) + return NULL; + + WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); + res = __request_region(&ndd->dpa, start, n, name, 0); + if (!res) + kfree(name); + return res; +} + +/** + * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id + * @nvdimm: container of dpa-resource-root + labels + * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid> + */ +resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, + struct nd_label_id *label_id) +{ + resource_size_t allocated = 0; + struct resource *res; + + for_each_dpa_resource(ndd, res) + if (strcmp(res->name, label_id->id) == 0) + allocated += resource_size(res); + + return allocated; +} + +static int count_dimms(struct device *dev, void *c) +{ + int *count = c; + + if (is_nvdimm(dev)) + (*count)++; + return 0; +} + +int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) +{ + int count = 0; + /* Flush any possible dimm registration failures */ + nd_synchronize(); + + device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); + dev_dbg(&nvdimm_bus->dev, "count: %d\n", count); + if (count != dimm_count) + return -ENXIO; + return 0; +} +EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); + +void __exit nvdimm_devs_exit(void) +{ + ida_destroy(&dimm_ida); +} |