diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 1224 |
1 files changed, 1224 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c new file mode 100644 index 000000000..7995f93db --- /dev/null +++ b/drivers/nvdimm/region_devs.c @@ -0,0 +1,1224 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. + */ +#include <linux/scatterlist.h> +#include <linux/memregion.h> +#include <linux/highmem.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/hash.h> +#include <linux/sort.h> +#include <linux/io.h> +#include <linux/nd.h> +#include "nd-core.h" +#include "nd.h" + +/* + * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is + * irrelevant. + */ +#include <linux/io-64-nonatomic-hi-lo.h> + +static DEFINE_PER_CPU(int, flush_idx); + +static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm, + struct nd_region_data *ndrd) +{ + int i, j; + + dev_dbg(dev, "%s: map %d flush address%s\n", nvdimm_name(nvdimm), + nvdimm->num_flush, nvdimm->num_flush == 1 ? "" : "es"); + for (i = 0; i < (1 << ndrd->hints_shift); i++) { + struct resource *res = &nvdimm->flush_wpq[i]; + unsigned long pfn = PHYS_PFN(res->start); + void __iomem *flush_page; + + /* check if flush hints share a page */ + for (j = 0; j < i; j++) { + struct resource *res_j = &nvdimm->flush_wpq[j]; + unsigned long pfn_j = PHYS_PFN(res_j->start); + + if (pfn == pfn_j) + break; + } + + if (j < i) + flush_page = (void __iomem *) ((unsigned long) + ndrd_get_flush_wpq(ndrd, dimm, j) + & PAGE_MASK); + else + flush_page = devm_nvdimm_ioremap(dev, + PFN_PHYS(pfn), PAGE_SIZE); + if (!flush_page) + return -ENXIO; + ndrd_set_flush_wpq(ndrd, dimm, i, flush_page + + (res->start & ~PAGE_MASK)); + } + + return 0; +} + +int nd_region_activate(struct nd_region *nd_region) +{ + int i, j, num_flush = 0; + struct nd_region_data *ndrd; + struct device *dev = &nd_region->dev; + size_t flush_data_size = sizeof(void *); + + nvdimm_bus_lock(&nd_region->dev); + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + nvdimm_bus_unlock(&nd_region->dev); + return -EBUSY; + } + + /* at least one null hint slot per-dimm for the "no-hint" case */ + flush_data_size += sizeof(void *); + num_flush = min_not_zero(num_flush, nvdimm->num_flush); + if (!nvdimm->num_flush) + continue; + flush_data_size += nvdimm->num_flush * sizeof(void *); + } + nvdimm_bus_unlock(&nd_region->dev); + + ndrd = devm_kzalloc(dev, sizeof(*ndrd) + flush_data_size, GFP_KERNEL); + if (!ndrd) + return -ENOMEM; + dev_set_drvdata(dev, ndrd); + + if (!num_flush) + return 0; + + ndrd->hints_shift = ilog2(num_flush); + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + int rc = nvdimm_map_flush(&nd_region->dev, nvdimm, i, ndrd); + + if (rc) + return rc; + } + + /* + * Clear out entries that are duplicates. This should prevent the + * extra flushings. + */ + for (i = 0; i < nd_region->ndr_mappings - 1; i++) { + /* ignore if NULL already */ + if (!ndrd_get_flush_wpq(ndrd, i, 0)) + continue; + + for (j = i + 1; j < nd_region->ndr_mappings; j++) + if (ndrd_get_flush_wpq(ndrd, i, 0) == + ndrd_get_flush_wpq(ndrd, j, 0)) + ndrd_set_flush_wpq(ndrd, j, 0, NULL); + } + + return 0; +} + +static void nd_region_release(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev); + u16 i; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + put_device(&nvdimm->dev); + } + free_percpu(nd_region->lane); + if (!test_bit(ND_REGION_CXL, &nd_region->flags)) + memregion_free(nd_region->id); + kfree(nd_region); +} + +struct nd_region *to_nd_region(struct device *dev) +{ + struct nd_region *nd_region = container_of(dev, struct nd_region, dev); + + WARN_ON(dev->type->release != nd_region_release); + return nd_region; +} +EXPORT_SYMBOL_GPL(to_nd_region); + +struct device *nd_region_dev(struct nd_region *nd_region) +{ + if (!nd_region) + return NULL; + return &nd_region->dev; +} +EXPORT_SYMBOL_GPL(nd_region_dev); + +void *nd_region_provider_data(struct nd_region *nd_region) +{ + return nd_region->provider_data; +} +EXPORT_SYMBOL_GPL(nd_region_provider_data); + +/** + * nd_region_to_nstype() - region to an integer namespace type + * @nd_region: region-device to interrogate + * + * This is the 'nstype' attribute of a region as well, an input to the + * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match + * namespace devices with namespace drivers. + */ +int nd_region_to_nstype(struct nd_region *nd_region) +{ + if (is_memory(&nd_region->dev)) { + u16 i, label; + + for (i = 0, label = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + if (test_bit(NDD_LABELING, &nvdimm->flags)) + label++; + } + if (label) + return ND_DEVICE_NAMESPACE_PMEM; + else + return ND_DEVICE_NAMESPACE_IO; + } + + return 0; +} +EXPORT_SYMBOL(nd_region_to_nstype); + +static unsigned long long region_size(struct nd_region *nd_region) +{ + if (is_memory(&nd_region->dev)) { + return nd_region->ndr_size; + } else if (nd_region->ndr_mappings == 1) { + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + + return nd_mapping->size; + } + + return 0; +} + +static ssize_t size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%llu\n", region_size(nd_region)); +} +static DEVICE_ATTR_RO(size); + +static ssize_t deep_flush_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + /* + * NOTE: in the nvdimm_has_flush() error case this attribute is + * not visible. + */ + return sprintf(buf, "%d\n", nvdimm_has_flush(nd_region)); +} + +static ssize_t deep_flush_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + bool flush; + int rc = strtobool(buf, &flush); + struct nd_region *nd_region = to_nd_region(dev); + + if (rc) + return rc; + if (!flush) + return -EINVAL; + rc = nvdimm_flush(nd_region, NULL); + if (rc) + return rc; + + return len; +} +static DEVICE_ATTR_RW(deep_flush); + +static ssize_t mappings_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%d\n", nd_region->ndr_mappings); +} +static DEVICE_ATTR_RO(mappings); + +static ssize_t nstype_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); +} +static DEVICE_ATTR_RO(nstype); + +static ssize_t set_cookie_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + struct nd_interleave_set *nd_set = nd_region->nd_set; + ssize_t rc = 0; + + if (is_memory(dev) && nd_set) + /* pass, should be precluded by region_visible */; + else + return -ENXIO; + + /* + * The cookie to show depends on which specification of the + * labels we are using. If there are not labels then default to + * the v1.1 namespace label cookie definition. To read all this + * data we need to wait for probing to settle. + */ + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + if (nd_region->ndr_mappings) { + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + + if (ndd) { + struct nd_namespace_index *nsindex; + + nsindex = to_namespace_index(ndd, ndd->ns_current); + rc = sprintf(buf, "%#llx\n", + nd_region_interleave_set_cookie(nd_region, + nsindex)); + } + } + nvdimm_bus_unlock(dev); + device_unlock(dev); + + if (rc) + return rc; + return sprintf(buf, "%#llx\n", nd_set->cookie1); +} +static DEVICE_ATTR_RO(set_cookie); + +resource_size_t nd_region_available_dpa(struct nd_region *nd_region) +{ + resource_size_t available; + int i; + + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + + available = 0; + 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; + + available += nd_pmem_available_dpa(nd_region, nd_mapping); + } + + return available; +} + +resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region) +{ + resource_size_t avail = 0; + int i; + + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + + avail = min_not_zero(avail, nd_pmem_max_contiguous_dpa( + nd_region, nd_mapping)); + } + return avail * nd_region->ndr_mappings; +} + +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. + */ + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + available = nd_region_available_dpa(nd_region); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return sprintf(buf, "%llu\n", available); +} +static DEVICE_ATTR_RO(available_size); + +static ssize_t max_available_extent_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + unsigned long long available = 0; + + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + available = nd_region_allocatable_dpa(nd_region); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return sprintf(buf, "%llu\n", available); +} +static DEVICE_ATTR_RO(max_available_extent); + +static ssize_t init_namespaces_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region_data *ndrd = dev_get_drvdata(dev); + ssize_t rc; + + nvdimm_bus_lock(dev); + if (ndrd) + rc = sprintf(buf, "%d/%d\n", ndrd->ns_active, ndrd->ns_count); + else + rc = -ENXIO; + nvdimm_bus_unlock(dev); + + return rc; +} +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 ssize_t btt_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->btt_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(btt_seed); + +static ssize_t pfn_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->pfn_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(pfn_seed); + +static ssize_t dax_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->dax_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(dax_seed); + +static ssize_t read_only_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%d\n", nd_region->ro); +} + +static int revalidate_read_only(struct device *dev, void *data) +{ + nd_device_notify(dev, NVDIMM_REVALIDATE_REGION); + return 0; +} + +static ssize_t read_only_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + bool ro; + int rc = strtobool(buf, &ro); + struct nd_region *nd_region = to_nd_region(dev); + + if (rc) + return rc; + + nd_region->ro = ro; + device_for_each_child(dev, NULL, revalidate_read_only); + return len; +} +static DEVICE_ATTR_RW(read_only); + +static ssize_t align_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%#lx\n", nd_region->align); +} + +static ssize_t align_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev); + unsigned long val, dpa; + u32 mappings, remainder; + int rc; + + rc = kstrtoul(buf, 0, &val); + if (rc) + return rc; + + /* + * Ensure space-align is evenly divisible by the region + * interleave-width because the kernel typically has no facility + * to determine which DIMM(s), dimm-physical-addresses, would + * contribute to the tail capacity in system-physical-address + * space for the namespace. + */ + mappings = max_t(u32, 1, nd_region->ndr_mappings); + dpa = div_u64_rem(val, mappings, &remainder); + if (!is_power_of_2(dpa) || dpa < PAGE_SIZE + || val > region_size(nd_region) || remainder) + return -EINVAL; + + /* + * Given that space allocation consults this value multiple + * times ensure it does not change for the duration of the + * allocation. + */ + nvdimm_bus_lock(dev); + nd_region->align = val; + nvdimm_bus_unlock(dev); + + return len; +} +static DEVICE_ATTR_RW(align); + +static ssize_t region_badblocks_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + ssize_t rc; + + device_lock(dev); + if (dev->driver) + rc = badblocks_show(&nd_region->bb, buf, 0); + else + rc = -ENXIO; + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR(badblocks, 0444, region_badblocks_show, NULL); + +static ssize_t resource_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + return sprintf(buf, "%#llx\n", nd_region->ndr_start); +} +static DEVICE_ATTR_ADMIN_RO(resource); + +static ssize_t persistence_domain_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + + if (test_bit(ND_REGION_PERSIST_CACHE, &nd_region->flags)) + return sprintf(buf, "cpu_cache\n"); + else if (test_bit(ND_REGION_PERSIST_MEMCTRL, &nd_region->flags)) + return sprintf(buf, "memory_controller\n"); + else + return sprintf(buf, "\n"); +} +static DEVICE_ATTR_RO(persistence_domain); + +static struct attribute *nd_region_attributes[] = { + &dev_attr_size.attr, + &dev_attr_align.attr, + &dev_attr_nstype.attr, + &dev_attr_mappings.attr, + &dev_attr_btt_seed.attr, + &dev_attr_pfn_seed.attr, + &dev_attr_dax_seed.attr, + &dev_attr_deep_flush.attr, + &dev_attr_read_only.attr, + &dev_attr_set_cookie.attr, + &dev_attr_available_size.attr, + &dev_attr_max_available_extent.attr, + &dev_attr_namespace_seed.attr, + &dev_attr_init_namespaces.attr, + &dev_attr_badblocks.attr, + &dev_attr_resource.attr, + &dev_attr_persistence_domain.attr, + NULL, +}; + +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 (!is_memory(dev) && a == &dev_attr_pfn_seed.attr) + return 0; + + if (!is_memory(dev) && a == &dev_attr_dax_seed.attr) + return 0; + + if (!is_memory(dev) && a == &dev_attr_badblocks.attr) + return 0; + + if (a == &dev_attr_resource.attr && !is_memory(dev)) + return 0; + + if (a == &dev_attr_deep_flush.attr) { + int has_flush = nvdimm_has_flush(nd_region); + + if (has_flush == 1) + return a->mode; + else if (has_flush == 0) + return 0444; + else + return 0; + } + + if (a == &dev_attr_persistence_domain.attr) { + if ((nd_region->flags & (BIT(ND_REGION_PERSIST_CACHE) + | BIT(ND_REGION_PERSIST_MEMCTRL))) == 0) + return 0; + return a->mode; + } + + if (a == &dev_attr_align.attr) + return a->mode; + + if (a != &dev_attr_set_cookie.attr + && a != &dev_attr_available_size.attr) + return a->mode; + + if (type == ND_DEVICE_NAMESPACE_PMEM && + a == &dev_attr_available_size.attr) + return a->mode; + else if (is_memory(dev) && nd_set) + return a->mode; + + return 0; +} + +static ssize_t mappingN(struct device *dev, char *buf, int n) +{ + struct nd_region *nd_region = to_nd_region(dev); + struct nd_mapping *nd_mapping; + struct nvdimm *nvdimm; + + if (n >= nd_region->ndr_mappings) + return -ENXIO; + nd_mapping = &nd_region->mapping[n]; + nvdimm = nd_mapping->nvdimm; + + return sprintf(buf, "%s,%llu,%llu,%d\n", dev_name(&nvdimm->dev), + nd_mapping->start, nd_mapping->size, + nd_mapping->position); +} + +#define REGION_MAPPING(idx) \ +static ssize_t mapping##idx##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + return mappingN(dev, buf, idx); \ +} \ +static DEVICE_ATTR_RO(mapping##idx) + +/* + * 32 should be enough for a while, even in the presence of socket + * interleave a 32-way interleave set is a degenerate case. + */ +REGION_MAPPING(0); +REGION_MAPPING(1); +REGION_MAPPING(2); +REGION_MAPPING(3); +REGION_MAPPING(4); +REGION_MAPPING(5); +REGION_MAPPING(6); +REGION_MAPPING(7); +REGION_MAPPING(8); +REGION_MAPPING(9); +REGION_MAPPING(10); +REGION_MAPPING(11); +REGION_MAPPING(12); +REGION_MAPPING(13); +REGION_MAPPING(14); +REGION_MAPPING(15); +REGION_MAPPING(16); +REGION_MAPPING(17); +REGION_MAPPING(18); +REGION_MAPPING(19); +REGION_MAPPING(20); +REGION_MAPPING(21); +REGION_MAPPING(22); +REGION_MAPPING(23); +REGION_MAPPING(24); +REGION_MAPPING(25); +REGION_MAPPING(26); +REGION_MAPPING(27); +REGION_MAPPING(28); +REGION_MAPPING(29); +REGION_MAPPING(30); +REGION_MAPPING(31); + +static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct nd_region *nd_region = to_nd_region(dev); + + if (n < nd_region->ndr_mappings) + return a->mode; + return 0; +} + +static struct attribute *mapping_attributes[] = { + &dev_attr_mapping0.attr, + &dev_attr_mapping1.attr, + &dev_attr_mapping2.attr, + &dev_attr_mapping3.attr, + &dev_attr_mapping4.attr, + &dev_attr_mapping5.attr, + &dev_attr_mapping6.attr, + &dev_attr_mapping7.attr, + &dev_attr_mapping8.attr, + &dev_attr_mapping9.attr, + &dev_attr_mapping10.attr, + &dev_attr_mapping11.attr, + &dev_attr_mapping12.attr, + &dev_attr_mapping13.attr, + &dev_attr_mapping14.attr, + &dev_attr_mapping15.attr, + &dev_attr_mapping16.attr, + &dev_attr_mapping17.attr, + &dev_attr_mapping18.attr, + &dev_attr_mapping19.attr, + &dev_attr_mapping20.attr, + &dev_attr_mapping21.attr, + &dev_attr_mapping22.attr, + &dev_attr_mapping23.attr, + &dev_attr_mapping24.attr, + &dev_attr_mapping25.attr, + &dev_attr_mapping26.attr, + &dev_attr_mapping27.attr, + &dev_attr_mapping28.attr, + &dev_attr_mapping29.attr, + &dev_attr_mapping30.attr, + &dev_attr_mapping31.attr, + NULL, +}; + +static const struct attribute_group nd_mapping_attribute_group = { + .is_visible = mapping_visible, + .attrs = mapping_attributes, +}; + +static const struct attribute_group nd_region_attribute_group = { + .attrs = nd_region_attributes, + .is_visible = region_visible, +}; + +static const struct attribute_group *nd_region_attribute_groups[] = { + &nd_device_attribute_group, + &nd_region_attribute_group, + &nd_numa_attribute_group, + &nd_mapping_attribute_group, + NULL, +}; + +static const struct device_type nd_pmem_device_type = { + .name = "nd_pmem", + .release = nd_region_release, + .groups = nd_region_attribute_groups, +}; + +static const struct device_type nd_volatile_device_type = { + .name = "nd_volatile", + .release = nd_region_release, + .groups = nd_region_attribute_groups, +}; + +bool is_nd_pmem(struct device *dev) +{ + return dev ? dev->type == &nd_pmem_device_type : false; +} + +bool is_nd_volatile(struct device *dev) +{ + return dev ? dev->type == &nd_volatile_device_type : false; +} + +u64 nd_region_interleave_set_cookie(struct nd_region *nd_region, + struct nd_namespace_index *nsindex) +{ + struct nd_interleave_set *nd_set = nd_region->nd_set; + + if (!nd_set) + return 0; + + if (nsindex && __le16_to_cpu(nsindex->major) == 1 + && __le16_to_cpu(nsindex->minor) == 1) + return nd_set->cookie1; + return nd_set->cookie2; +} + +u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region) +{ + struct nd_interleave_set *nd_set = nd_region->nd_set; + + if (nd_set) + return nd_set->altcookie; + return 0; +} + +void nd_mapping_free_labels(struct nd_mapping *nd_mapping) +{ + struct nd_label_ent *label_ent, *e; + + lockdep_assert_held(&nd_mapping->lock); + list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { + list_del(&label_ent->list); + kfree(label_ent); + } +} + +/* + * When a namespace is activated create new seeds for the next + * namespace, or namespace-personality to be configured. + */ +void nd_region_advance_seeds(struct nd_region *nd_region, struct device *dev) +{ + nvdimm_bus_lock(dev); + if (nd_region->ns_seed == dev) { + nd_region_create_ns_seed(nd_region); + } else if (is_nd_btt(dev)) { + struct nd_btt *nd_btt = to_nd_btt(dev); + + if (nd_region->btt_seed == dev) + nd_region_create_btt_seed(nd_region); + if (nd_region->ns_seed == &nd_btt->ndns->dev) + nd_region_create_ns_seed(nd_region); + } else if (is_nd_pfn(dev)) { + struct nd_pfn *nd_pfn = to_nd_pfn(dev); + + if (nd_region->pfn_seed == dev) + nd_region_create_pfn_seed(nd_region); + if (nd_region->ns_seed == &nd_pfn->ndns->dev) + nd_region_create_ns_seed(nd_region); + } else if (is_nd_dax(dev)) { + struct nd_dax *nd_dax = to_nd_dax(dev); + + if (nd_region->dax_seed == dev) + nd_region_create_dax_seed(nd_region); + if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev) + nd_region_create_ns_seed(nd_region); + } + nvdimm_bus_unlock(dev); +} + +/** + * nd_region_acquire_lane - allocate and lock a lane + * @nd_region: region id and number of lanes possible + * + * A lane correlates to a BLK-data-window and/or a log slot in the BTT. + * We optimize for the common case where there are 256 lanes, one + * per-cpu. For larger systems we need to lock to share lanes. For now + * this implementation assumes the cost of maintaining an allocator for + * free lanes is on the order of the lock hold time, so it implements a + * static lane = cpu % num_lanes mapping. + * + * In the case of a BTT instance on top of a BLK namespace a lane may be + * acquired recursively. We lock on the first instance. + * + * In the case of a BTT instance on top of PMEM, we only acquire a lane + * for the BTT metadata updates. + */ +unsigned int nd_region_acquire_lane(struct nd_region *nd_region) +{ + unsigned int cpu, lane; + + migrate_disable(); + cpu = smp_processor_id(); + if (nd_region->num_lanes < nr_cpu_ids) { + struct nd_percpu_lane *ndl_lock, *ndl_count; + + lane = cpu % nd_region->num_lanes; + ndl_count = per_cpu_ptr(nd_region->lane, cpu); + ndl_lock = per_cpu_ptr(nd_region->lane, lane); + if (ndl_count->count++ == 0) + spin_lock(&ndl_lock->lock); + } else + lane = cpu; + + return lane; +} +EXPORT_SYMBOL(nd_region_acquire_lane); + +void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane) +{ + if (nd_region->num_lanes < nr_cpu_ids) { + unsigned int cpu = smp_processor_id(); + struct nd_percpu_lane *ndl_lock, *ndl_count; + + ndl_count = per_cpu_ptr(nd_region->lane, cpu); + ndl_lock = per_cpu_ptr(nd_region->lane, lane); + if (--ndl_count->count == 0) + spin_unlock(&ndl_lock->lock); + } + migrate_enable(); +} +EXPORT_SYMBOL(nd_region_release_lane); + +/* + * PowerPC requires this alignment for memremap_pages(). All other archs + * should be ok with SUBSECTION_SIZE (see memremap_compat_align()). + */ +#define MEMREMAP_COMPAT_ALIGN_MAX SZ_16M + +static unsigned long default_align(struct nd_region *nd_region) +{ + unsigned long align; + u32 remainder; + int mappings; + + align = MEMREMAP_COMPAT_ALIGN_MAX; + if (nd_region->ndr_size < MEMREMAP_COMPAT_ALIGN_MAX) + align = PAGE_SIZE; + + mappings = max_t(u16, 1, nd_region->ndr_mappings); + div_u64_rem(align, mappings, &remainder); + if (remainder) + align *= mappings; + + return align; +} + +static struct lock_class_key nvdimm_region_key; + +static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, + struct nd_region_desc *ndr_desc, + const struct device_type *dev_type, const char *caller) +{ + struct nd_region *nd_region; + struct device *dev; + unsigned int i; + int ro = 0; + + for (i = 0; i < ndr_desc->num_mappings; i++) { + struct nd_mapping_desc *mapping = &ndr_desc->mapping[i]; + struct nvdimm *nvdimm = mapping->nvdimm; + + if ((mapping->start | mapping->size) % PAGE_SIZE) { + dev_err(&nvdimm_bus->dev, + "%s: %s mapping%d is not %ld aligned\n", + caller, dev_name(&nvdimm->dev), i, PAGE_SIZE); + return NULL; + } + + if (test_bit(NDD_UNARMED, &nvdimm->flags)) + ro = 1; + + } + + nd_region = + kzalloc(struct_size(nd_region, mapping, ndr_desc->num_mappings), + GFP_KERNEL); + + if (!nd_region) + return NULL; + /* CXL pre-assigns memregion ids before creating nvdimm regions */ + if (test_bit(ND_REGION_CXL, &ndr_desc->flags)) { + nd_region->id = ndr_desc->memregion; + } else { + nd_region->id = memregion_alloc(GFP_KERNEL); + if (nd_region->id < 0) + goto err_id; + } + + nd_region->lane = alloc_percpu(struct nd_percpu_lane); + if (!nd_region->lane) + goto err_percpu; + + for (i = 0; i < nr_cpu_ids; i++) { + struct nd_percpu_lane *ndl; + + ndl = per_cpu_ptr(nd_region->lane, i); + spin_lock_init(&ndl->lock); + ndl->count = 0; + } + + for (i = 0; i < ndr_desc->num_mappings; i++) { + struct nd_mapping_desc *mapping = &ndr_desc->mapping[i]; + struct nvdimm *nvdimm = mapping->nvdimm; + + nd_region->mapping[i].nvdimm = nvdimm; + nd_region->mapping[i].start = mapping->start; + nd_region->mapping[i].size = mapping->size; + nd_region->mapping[i].position = mapping->position; + INIT_LIST_HEAD(&nd_region->mapping[i].labels); + mutex_init(&nd_region->mapping[i].lock); + + get_device(&nvdimm->dev); + } + nd_region->ndr_mappings = ndr_desc->num_mappings; + nd_region->provider_data = ndr_desc->provider_data; + nd_region->nd_set = ndr_desc->nd_set; + nd_region->num_lanes = ndr_desc->num_lanes; + nd_region->flags = ndr_desc->flags; + nd_region->ro = ro; + nd_region->numa_node = ndr_desc->numa_node; + nd_region->target_node = ndr_desc->target_node; + ida_init(&nd_region->ns_ida); + ida_init(&nd_region->btt_ida); + ida_init(&nd_region->pfn_ida); + ida_init(&nd_region->dax_ida); + dev = &nd_region->dev; + dev_set_name(dev, "region%d", nd_region->id); + dev->parent = &nvdimm_bus->dev; + dev->type = dev_type; + dev->groups = ndr_desc->attr_groups; + dev->of_node = ndr_desc->of_node; + nd_region->ndr_size = resource_size(ndr_desc->res); + nd_region->ndr_start = ndr_desc->res->start; + nd_region->align = default_align(nd_region); + if (ndr_desc->flush) + nd_region->flush = ndr_desc->flush; + else + nd_region->flush = NULL; + + device_initialize(dev); + lockdep_set_class(&dev->mutex, &nvdimm_region_key); + nd_device_register(dev); + + return nd_region; + +err_percpu: + if (!test_bit(ND_REGION_CXL, &ndr_desc->flags)) + memregion_free(nd_region->id); +err_id: + kfree(nd_region); + return NULL; +} + +struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus, + struct nd_region_desc *ndr_desc) +{ + ndr_desc->num_lanes = ND_MAX_LANES; + return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type, + __func__); +} +EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create); + +struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, + struct nd_region_desc *ndr_desc) +{ + ndr_desc->num_lanes = ND_MAX_LANES; + return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type, + __func__); +} +EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); + +void nvdimm_region_delete(struct nd_region *nd_region) +{ + if (nd_region) + nd_device_unregister(&nd_region->dev, ND_SYNC); +} +EXPORT_SYMBOL_GPL(nvdimm_region_delete); + +int nvdimm_flush(struct nd_region *nd_region, struct bio *bio) +{ + int rc = 0; + + if (!nd_region->flush) + rc = generic_nvdimm_flush(nd_region); + else { + if (nd_region->flush(nd_region, bio)) + rc = -EIO; + } + + return rc; +} +/** + * generic_nvdimm_flush() - flush any posted write queues between the cpu and pmem media + * @nd_region: interleaved pmem region + */ +int generic_nvdimm_flush(struct nd_region *nd_region) +{ + struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev); + int i, idx; + + /* + * Try to encourage some diversity in flush hint addresses + * across cpus assuming a limited number of flush hints. + */ + idx = this_cpu_read(flush_idx); + idx = this_cpu_add_return(flush_idx, hash_32(current->pid + idx, 8)); + + /* + * The pmem_wmb() is needed to 'sfence' all + * previous writes such that they are architecturally visible for + * the platform buffer flush. Note that we've already arranged for pmem + * writes to avoid the cache via memcpy_flushcache(). The final + * wmb() ensures ordering for the NVDIMM flush write. + */ + pmem_wmb(); + for (i = 0; i < nd_region->ndr_mappings; i++) + if (ndrd_get_flush_wpq(ndrd, i, 0)) + writeq(1, ndrd_get_flush_wpq(ndrd, i, idx)); + wmb(); + + return 0; +} +EXPORT_SYMBOL_GPL(nvdimm_flush); + +/** + * nvdimm_has_flush - determine write flushing requirements + * @nd_region: interleaved pmem region + * + * Returns 1 if writes require flushing + * Returns 0 if writes do not require flushing + * Returns -ENXIO if flushing capability can not be determined + */ +int nvdimm_has_flush(struct nd_region *nd_region) +{ + int i; + + /* no nvdimm or pmem api == flushing capability unknown */ + if (nd_region->ndr_mappings == 0 + || !IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API)) + return -ENXIO; + + /* Test if an explicit flush function is defined */ + if (test_bit(ND_REGION_ASYNC, &nd_region->flags) && nd_region->flush) + return 1; + + /* Test if any flush hints for the region are available */ + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + /* flush hints present / available */ + if (nvdimm->num_flush) + return 1; + } + + /* + * The platform defines dimm devices without hints nor explicit flush, + * assume platform persistence mechanism like ADR + */ + return 0; +} +EXPORT_SYMBOL_GPL(nvdimm_has_flush); + +int nvdimm_has_cache(struct nd_region *nd_region) +{ + return is_nd_pmem(&nd_region->dev) && + !test_bit(ND_REGION_PERSIST_CACHE, &nd_region->flags); +} +EXPORT_SYMBOL_GPL(nvdimm_has_cache); + +bool is_nvdimm_sync(struct nd_region *nd_region) +{ + if (is_nd_volatile(&nd_region->dev)) + return true; + + return is_nd_pmem(&nd_region->dev) && + !test_bit(ND_REGION_ASYNC, &nd_region->flags); +} +EXPORT_SYMBOL_GPL(is_nvdimm_sync); + +struct conflict_context { + struct nd_region *nd_region; + resource_size_t start, size; +}; + +static int region_conflict(struct device *dev, void *data) +{ + struct nd_region *nd_region; + struct conflict_context *ctx = data; + resource_size_t res_end, region_end, region_start; + + if (!is_memory(dev)) + return 0; + + nd_region = to_nd_region(dev); + if (nd_region == ctx->nd_region) + return 0; + + res_end = ctx->start + ctx->size; + region_start = nd_region->ndr_start; + region_end = region_start + nd_region->ndr_size; + if (ctx->start >= region_start && ctx->start < region_end) + return -EBUSY; + if (res_end > region_start && res_end <= region_end) + return -EBUSY; + return 0; +} + +int nd_region_conflict(struct nd_region *nd_region, resource_size_t start, + resource_size_t size) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); + struct conflict_context ctx = { + .nd_region = nd_region, + .start = start, + .size = size, + }; + + return device_for_each_child(&nvdimm_bus->dev, &ctx, region_conflict); +} |