diff options
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 158 |
1 files changed, 150 insertions, 8 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 1571424..b45806f 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -15,6 +15,7 @@ #include <linux/slab.h> #include <linux/sort.h> #include <linux/io.h> +#include <linux/nd.h> #include "nd-core.h" #include "nd.h" @@ -99,6 +100,58 @@ int nd_region_to_nstype(struct nd_region *nd_region) return 0; } +EXPORT_SYMBOL(nd_region_to_nstype); + +static int is_uuid_busy(struct device *dev, void *data) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + u8 *uuid = data; + + switch (nd_region_to_nstype(nd_region)) { + case ND_DEVICE_NAMESPACE_PMEM: { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + if (!nspm->uuid) + break; + if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0) + return -EBUSY; + break; + } + case ND_DEVICE_NAMESPACE_BLK: { + /* TODO: blk namespace support */ + break; + } + default: + break; + } + + return 0; +} + +static int is_namespace_uuid_busy(struct device *dev, void *data) +{ + if (is_nd_pmem(dev) || is_nd_blk(dev)) + return device_for_each_child(dev, data, is_uuid_busy); + return 0; +} + +/** + * nd_is_uuid_unique - verify that no other namespace has @uuid + * @dev: any device on a nvdimm_bus + * @uuid: uuid to check + */ +bool nd_is_uuid_unique(struct device *dev, u8 *uuid) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); + + if (!nvdimm_bus) + return false; + WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev)); + if (device_for_each_child(&nvdimm_bus->dev, uuid, + is_namespace_uuid_busy) != 0) + return false; + return true; +} static ssize_t size_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -151,6 +204,60 @@ static ssize_t set_cookie_show(struct device *dev, } static DEVICE_ATTR_RO(set_cookie); +resource_size_t nd_region_available_dpa(struct nd_region *nd_region) +{ + resource_size_t blk_max_overlap = 0, available, overlap; + int i; + + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + + retry: + available = 0; + overlap = blk_max_overlap; + 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); + + /* if a dimm is disabled the available capacity is zero */ + if (!ndd) + return 0; + + if (is_nd_pmem(&nd_region->dev)) { + available += nd_pmem_available_dpa(nd_region, + nd_mapping, &overlap); + if (overlap > blk_max_overlap) { + blk_max_overlap = overlap; + goto retry; + } + } else if (is_nd_blk(&nd_region->dev)) { + /* TODO: BLK Namespace support */ + } + } + + return available; +} + +static ssize_t available_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + unsigned long long available = 0; + + /* + * Flush in-flight updates and grab a snapshot of the available + * size. Of course, this value is potentially invalidated the + * memory nvdimm_bus_lock() is dropped, but that's userspace's + * problem to not race itself. + */ + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + available = nd_region_available_dpa(nd_region); + nvdimm_bus_unlock(dev); + + return sprintf(buf, "%llu\n", available); +} +static DEVICE_ATTR_RO(available_size); + static ssize_t init_namespaces_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -168,11 +275,29 @@ static ssize_t init_namespaces_show(struct device *dev, } static DEVICE_ATTR_RO(init_namespaces); +static ssize_t namespace_seed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + ssize_t rc; + + nvdimm_bus_lock(dev); + if (nd_region->ns_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + return rc; +} +static DEVICE_ATTR_RO(namespace_seed); + static struct attribute *nd_region_attributes[] = { &dev_attr_size.attr, &dev_attr_nstype.attr, &dev_attr_mappings.attr, &dev_attr_set_cookie.attr, + &dev_attr_available_size.attr, + &dev_attr_namespace_seed.attr, &dev_attr_init_namespaces.attr, NULL, }; @@ -182,12 +307,18 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n) struct device *dev = container_of(kobj, typeof(*dev), kobj); struct nd_region *nd_region = to_nd_region(dev); struct nd_interleave_set *nd_set = nd_region->nd_set; + int type = nd_region_to_nstype(nd_region); - if (a != &dev_attr_set_cookie.attr) + if (a != &dev_attr_set_cookie.attr + && a != &dev_attr_available_size.attr) return a->mode; - if (is_nd_pmem(dev) && nd_set) - return a->mode; + if ((type == ND_DEVICE_NAMESPACE_PMEM + || type == ND_DEVICE_NAMESPACE_BLK) + && a == &dev_attr_available_size.attr) + return a->mode; + else if (is_nd_pmem(dev) && nd_set) + return a->mode; return 0; } @@ -198,6 +329,15 @@ struct attribute_group nd_region_attribute_group = { }; EXPORT_SYMBOL_GPL(nd_region_attribute_group); +u64 nd_region_interleave_set_cookie(struct nd_region *nd_region) +{ + struct nd_interleave_set *nd_set = nd_region->nd_set; + + if (nd_set) + return nd_set->cookie; + return 0; +} + /* * Upon successful probe/remove, take/release a reference on the * associated interleave set (if present) @@ -205,18 +345,20 @@ EXPORT_SYMBOL_GPL(nd_region_attribute_group); static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, struct device *dev, bool probe) { - if (is_nd_pmem(dev) || is_nd_blk(dev)) { + if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) { struct nd_region *nd_region = to_nd_region(dev); int i; for (i = 0; i < nd_region->ndr_mappings; i++) { struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm_drvdata *ndd = nd_mapping->ndd; struct nvdimm *nvdimm = nd_mapping->nvdimm; - if (probe) - atomic_inc(&nvdimm->busy); - else - atomic_dec(&nvdimm->busy); + kfree(nd_mapping->labels); + nd_mapping->labels = NULL; + put_ndd(ndd); + nd_mapping->ndd = NULL; + atomic_dec(&nvdimm->busy); } } } |
