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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/moduleparam.h>
- #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);
- static bool noblk;
- module_param(noblk, bool, 0444);
- MODULE_PARM_DESC(noblk, "force disable BLK / local alias support");
- /*
- * 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_LABELING, &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, "%ps: %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_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
- size_t offset, size_t len)
- {
- struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
- struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
- int rc = validate_dimm(ndd), cmd_rc = 0;
- struct nd_cmd_get_config_data_hdr *cmd;
- size_t max_cmd_size, buf_offset;
- if (rc)
- return rc;
- if (offset + len > ndd->nsarea.config_size)
- return -ENXIO;
- max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
- cmd = kvzalloc(max_cmd_size + sizeof(*cmd), 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);
- cmd_size = sizeof(*cmd) + cmd->in_length;
- rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
- ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
- if (rc < 0)
- break;
- if (cmd_rc < 0) {
- rc = cmd_rc;
- break;
- }
- /* out_buf should be valid, copy it into our output buffer */
- memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
- }
- kvfree(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 (offset + len > ndd->nsarea.config_size)
- return -ENXIO;
- max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
- cmd = kvzalloc(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;
- }
- }
- kvfree(cmd);
- return rc;
- }
- void nvdimm_set_labeling(struct device *dev)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- set_bit(NDD_LABELING, &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);
- }
- 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%s\n",
- test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
- test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
- 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;
- nd_device_lock(dev);
- rc = __available_slots_show(dev_get_drvdata(dev), buf);
- nd_device_unlock(dev);
- return rc;
- }
- static DEVICE_ATTR_RO(available_slots);
- __weak ssize_t security_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
- return sprintf(buf, "overwrite\n");
- if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
- return sprintf(buf, "disabled\n");
- if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
- return sprintf(buf, "unlocked\n");
- if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
- return sprintf(buf, "locked\n");
- return -ENOTTY;
- }
- static ssize_t frozen_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
- &nvdimm->sec.flags));
- }
- static DEVICE_ATTR_RO(frozen);
- static ssize_t security_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
- {
- ssize_t rc;
- /*
- * Require all userspace triggered security management to be
- * done while probing is idle and the DIMM is not in active use
- * in any region.
- */
- nd_device_lock(dev);
- nvdimm_bus_lock(dev);
- wait_nvdimm_bus_probe_idle(dev);
- rc = nvdimm_security_store(dev, buf, len);
- nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
- return rc;
- }
- static DEVICE_ATTR_RW(security);
- static struct attribute *nvdimm_attributes[] = {
- &dev_attr_state.attr,
- &dev_attr_flags.attr,
- &dev_attr_commands.attr,
- &dev_attr_available_slots.attr,
- &dev_attr_security.attr,
- &dev_attr_frozen.attr,
- NULL,
- };
- static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
- {
- struct device *dev = container_of(kobj, typeof(*dev), kobj);
- struct nvdimm *nvdimm = to_nvdimm(dev);
- if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
- return a->mode;
- if (!nvdimm->sec.flags)
- return 0;
- if (a == &dev_attr_security.attr) {
- /* Are there any state mutation ops (make writable)? */
- if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
- || nvdimm->sec.ops->change_key
- || nvdimm->sec.ops->erase
- || nvdimm->sec.ops->overwrite)
- return a->mode;
- return 0444;
- }
- if (nvdimm->sec.ops->freeze)
- return a->mode;
- return 0;
- }
- static const struct attribute_group nvdimm_attribute_group = {
- .attrs = nvdimm_attributes,
- .is_visible = nvdimm_visible,
- };
- static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- enum nvdimm_fwa_result result;
- if (!nvdimm->fw_ops)
- return -EOPNOTSUPP;
- nvdimm_bus_lock(dev);
- result = nvdimm->fw_ops->activate_result(nvdimm);
- nvdimm_bus_unlock(dev);
- switch (result) {
- case NVDIMM_FWA_RESULT_NONE:
- return sprintf(buf, "none\n");
- case NVDIMM_FWA_RESULT_SUCCESS:
- return sprintf(buf, "success\n");
- case NVDIMM_FWA_RESULT_FAIL:
- return sprintf(buf, "fail\n");
- case NVDIMM_FWA_RESULT_NOTSTAGED:
- return sprintf(buf, "not_staged\n");
- case NVDIMM_FWA_RESULT_NEEDRESET:
- return sprintf(buf, "need_reset\n");
- default:
- return -ENXIO;
- }
- }
- static DEVICE_ATTR_ADMIN_RO(result);
- static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- enum nvdimm_fwa_state state;
- if (!nvdimm->fw_ops)
- return -EOPNOTSUPP;
- nvdimm_bus_lock(dev);
- state = nvdimm->fw_ops->activate_state(nvdimm);
- nvdimm_bus_unlock(dev);
- switch (state) {
- case NVDIMM_FWA_IDLE:
- return sprintf(buf, "idle\n");
- case NVDIMM_FWA_BUSY:
- return sprintf(buf, "busy\n");
- case NVDIMM_FWA_ARMED:
- return sprintf(buf, "armed\n");
- default:
- return -ENXIO;
- }
- }
- static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- enum nvdimm_fwa_trigger arg;
- int rc;
- if (!nvdimm->fw_ops)
- return -EOPNOTSUPP;
- if (sysfs_streq(buf, "arm"))
- arg = NVDIMM_FWA_ARM;
- else if (sysfs_streq(buf, "disarm"))
- arg = NVDIMM_FWA_DISARM;
- else
- return -EINVAL;
- nvdimm_bus_lock(dev);
- rc = nvdimm->fw_ops->arm(nvdimm, arg);
- nvdimm_bus_unlock(dev);
- if (rc < 0)
- return rc;
- return len;
- }
- static DEVICE_ATTR_ADMIN_RW(activate);
- static struct attribute *nvdimm_firmware_attributes[] = {
- &dev_attr_activate.attr,
- &dev_attr_result.attr,
- NULL,
- };
- static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
- {
- struct device *dev = container_of(kobj, typeof(*dev), kobj);
- struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
- struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
- struct nvdimm *nvdimm = to_nvdimm(dev);
- enum nvdimm_fwa_capability cap;
- if (!nd_desc->fw_ops)
- return 0;
- if (!nvdimm->fw_ops)
- return 0;
- nvdimm_bus_lock(dev);
- cap = nd_desc->fw_ops->capability(nd_desc);
- nvdimm_bus_unlock(dev);
- if (cap < NVDIMM_FWA_CAP_QUIESCE)
- return 0;
- return a->mode;
- }
- static const struct attribute_group nvdimm_firmware_attribute_group = {
- .name = "firmware",
- .attrs = nvdimm_firmware_attributes,
- .is_visible = nvdimm_firmware_visible,
- };
- static const struct attribute_group *nvdimm_attribute_groups[] = {
- &nd_device_attribute_group,
- &nvdimm_attribute_group,
- &nvdimm_firmware_attribute_group,
- NULL,
- };
- static const struct device_type nvdimm_device_type = {
- .name = "nvdimm",
- .release = nvdimm_release,
- .groups = nvdimm_attribute_groups,
- };
- bool is_nvdimm(struct device *dev)
- {
- return dev->type == &nvdimm_device_type;
- }
- 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, const char *dimm_id,
- const struct nvdimm_security_ops *sec_ops,
- const struct nvdimm_fw_ops *fw_ops)
- {
- 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->dimm_id = dimm_id;
- nvdimm->provider_data = provider_data;
- if (noblk)
- flags |= 1 << NDD_NOBLK;
- 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;
- nvdimm->sec.ops = sec_ops;
- nvdimm->fw_ops = fw_ops;
- nvdimm->sec.overwrite_tmo = 0;
- INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
- /*
- * Security state must be initialized before device_add() for
- * attribute visibility.
- */
- /* get security state and extended (master) state */
- nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
- nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
- nd_device_register(dev);
- return nvdimm;
- }
- EXPORT_SYMBOL_GPL(__nvdimm_create);
- static void shutdown_security_notify(void *data)
- {
- struct nvdimm *nvdimm = data;
- sysfs_put(nvdimm->sec.overwrite_state);
- }
- int nvdimm_security_setup_events(struct device *dev)
- {
- struct nvdimm *nvdimm = to_nvdimm(dev);
- if (!nvdimm->sec.flags || !nvdimm->sec.ops
- || !nvdimm->sec.ops->overwrite)
- return 0;
- nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
- if (!nvdimm->sec.overwrite_state)
- return -ENOMEM;
- return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
- }
- EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
- int nvdimm_in_overwrite(struct nvdimm *nvdimm)
- {
- return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
- }
- EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
- int nvdimm_security_freeze(struct nvdimm *nvdimm)
- {
- int rc;
- WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
- if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
- return -EOPNOTSUPP;
- if (!nvdimm->sec.flags)
- return -EIO;
- if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
- dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
- return -EBUSY;
- }
- rc = nvdimm->sec.ops->freeze(nvdimm);
- nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
- return rc;
- }
- static unsigned long dpa_align(struct nd_region *nd_region)
- {
- struct device *dev = &nd_region->dev;
- if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
- "bus lock required for capacity provision\n"))
- return 0;
- if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
- % nd_region->ndr_mappings,
- "invalid region align %#lx mappings: %d\n",
- nd_region->align, nd_region->ndr_mappings))
- return 0;
- return nd_region->align / nd_region->ndr_mappings;
- }
- 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;
- unsigned long align;
- 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.
- */
- align = dpa_align(nd_region);
- if (!align)
- return 0;
- for_each_dpa_resource(ndd, res) {
- resource_size_t start, end;
- if (strncmp(res->name, "pmem", 4) != 0)
- continue;
- start = ALIGN_DOWN(res->start, align);
- end = ALIGN(res->end + 1, align) - 1;
- if ((start >= blk_start && start < map_end)
- || (end >= blk_start && end <= map_end)) {
- new = max(blk_start, min(map_end, 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;
- unsigned long align;
- if (!ndd)
- return 0;
- device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
- /* now account for busy blk allocations in unaliased dpa */
- align = dpa_align(nd_region);
- if (!align)
- return 0;
- for_each_dpa_resource(ndd, res) {
- resource_size_t start, end, size;
- if (strncmp(res->name, "blk", 3) != 0)
- continue;
- start = ALIGN_DOWN(res->start, align);
- end = ALIGN(res->end + 1, align) - 1;
- size = end - start + 1;
- if (size >= info.available)
- return 0;
- info.available -= size;
- }
- 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;
- unsigned long align;
- /* if a dimm is disabled the available capacity is zero */
- if (!ndd)
- return 0;
- align = dpa_align(nd_region);
- if (!align)
- 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) {
- resource_size_t start, end;
- if (strcmp(res->name, "pmem-reserve") != 0)
- continue;
- /* trim free space relative to current alignment setting */
- start = ALIGN(res->start, align);
- end = ALIGN_DOWN(res->end + 1, align) - 1;
- if (end < start)
- continue;
- if (end - start + 1 > max)
- max = end - start + 1;
- }
- 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;
- unsigned long align;
- if (!ndd)
- return 0;
- align = dpa_align(nd_region);
- if (!align)
- 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) {
- resource_size_t start, end;
- start = ALIGN_DOWN(res->start, align);
- end = ALIGN(res->end + 1, align) - 1;
- if (start >= map_start && start < map_end) {
- if (strncmp(res->name, "blk", 3) == 0)
- blk_start = min(blk_start,
- max(map_start, start));
- else if (end > map_end) {
- reason = "misaligned to iset";
- goto err;
- } else
- busy += end - start + 1;
- } else if (end >= map_start && 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 += end - start + 1;
- } else if (map_start > start && map_start < 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 ALIGN_DOWN(available - busy, align);
- 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);
- }
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