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authorVishal Verma <vishal.l.verma@intel.com>2015-12-25 05:21:43 +0300
committerDan Williams <dan.j.williams@intel.com>2016-01-09 19:39:03 +0300
commit0caeef63e6d2f866d85bb507bf63e0ce8ec91cef (patch)
treedbd09f34ab455ca2dfc8c246ff7d19d17edd1de7 /drivers/nvdimm/core.c
parentd26f73f083ed6fbea7fd3fdbacb527b7f3e75ac0 (diff)
downloadlinux-0caeef63e6d2f866d85bb507bf63e0ce8ec91cef.tar.xz
libnvdimm: Add a poison list and export badblocks
During region creation, perform Address Range Scrubs (ARS) for the SPA (System Physical Address) ranges to retrieve known poison locations from firmware. Add a new data structure 'nd_poison' which is used as a list in nvdimm_bus to store these poison locations. When creating a pmem namespace, if there is any known poison associated with its physical address space, convert the poison ranges to bad sectors that are exposed using the badblocks interface. Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/core.c')
-rw-r--r--drivers/nvdimm/core.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 82c49bb87055..21003b7f0b38 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -325,6 +325,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
+ INIT_LIST_HEAD(&nvdimm_bus->poison_list);
init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
mutex_init(&nvdimm_bus->reconfig_mutex);
@@ -359,6 +360,191 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
}
EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
+/**
+ * __add_badblock_range() - Convert a physical address range to bad sectors
+ * @disk: the disk associated with the namespace
+ * @ns_offset: namespace offset where the error range begins (in bytes)
+ * @len: number of bytes of poison to be added
+ *
+ * This assumes that the range provided with (ns_offset, len) is within
+ * the bounds of physical addresses for this namespace, i.e. lies in the
+ * interval [ns_start, ns_start + ns_size)
+ */
+static int __add_badblock_range(struct gendisk *disk, u64 ns_offset, u64 len)
+{
+ unsigned int sector_size = queue_logical_block_size(disk->queue);
+ sector_t start_sector;
+ u64 num_sectors;
+ u32 rem;
+ int rc;
+
+ start_sector = div_u64(ns_offset, sector_size);
+ num_sectors = div_u64_rem(len, sector_size, &rem);
+ if (rem)
+ num_sectors++;
+
+ if (!disk->bb) {
+ rc = disk_alloc_badblocks(disk);
+ if (rc)
+ return rc;
+ }
+
+ if (unlikely(num_sectors > (u64)INT_MAX)) {
+ u64 remaining = num_sectors;
+ sector_t s = start_sector;
+
+ while (remaining) {
+ int done = min_t(u64, remaining, INT_MAX);
+
+ rc = disk_set_badblocks(disk, s, done);
+ if (rc)
+ return rc;
+ remaining -= done;
+ s += done;
+ }
+ return 0;
+ } else
+ return disk_set_badblocks(disk, start_sector, num_sectors);
+}
+
+/**
+ * nvdimm_namespace_add_poison() - Convert a list of poison ranges to badblocks
+ * @disk: the gendisk associated with the namespace where badblocks
+ * will be stored
+ * @offset: offset at the start of the namespace before 'sector 0'
+ * @ndns: the namespace containing poison ranges
+ *
+ * The poison list generated during NFIT initialization may contain multiple,
+ * possibly overlapping ranges in the SPA (System Physical Address) space.
+ * Compare each of these ranges to the namespace currently being initialized,
+ * and add badblocks to the gendisk for all matching sub-ranges
+ *
+ * Return:
+ * 0 - Success
+ */
+int nvdimm_namespace_add_poison(struct gendisk *disk, resource_size_t offset,
+ struct nd_namespace_common *ndns)
+{
+ struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
+ struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
+ struct nvdimm_bus *nvdimm_bus;
+ struct list_head *poison_list;
+ u64 ns_start, ns_end, ns_size;
+ struct nd_poison *pl;
+ int rc;
+
+ ns_size = nvdimm_namespace_capacity(ndns) - offset;
+ ns_start = nsio->res.start + offset;
+ ns_end = nsio->res.end;
+
+ nvdimm_bus = to_nvdimm_bus(nd_region->dev.parent);
+ poison_list = &nvdimm_bus->poison_list;
+ if (list_empty(poison_list))
+ return 0;
+
+ list_for_each_entry(pl, poison_list, list) {
+ u64 pl_end = pl->start + pl->length - 1;
+
+ /* Discard intervals with no intersection */
+ if (pl_end < ns_start)
+ continue;
+ if (pl->start > ns_end)
+ continue;
+ /* Deal with any overlap after start of the namespace */
+ if (pl->start >= ns_start) {
+ u64 start = pl->start;
+ u64 len;
+
+ if (pl_end <= ns_end)
+ len = pl->length;
+ else
+ len = ns_start + ns_size - pl->start;
+
+ rc = __add_badblock_range(disk, start - ns_start, len);
+ if (rc)
+ return rc;
+ dev_info(&nvdimm_bus->dev,
+ "Found a poison range (0x%llx, 0x%llx)\n",
+ start, len);
+ continue;
+ }
+ /* Deal with overlap for poison starting before the namespace */
+ if (pl->start < ns_start) {
+ u64 len;
+
+ if (pl_end < ns_end)
+ len = pl->start + pl->length - ns_start;
+ else
+ len = ns_size;
+
+ rc = __add_badblock_range(disk, 0, len);
+ if (rc)
+ return rc;
+ dev_info(&nvdimm_bus->dev,
+ "Found a poison range (0x%llx, 0x%llx)\n",
+ pl->start, len);
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvdimm_namespace_add_poison);
+
+static int __add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
+{
+ struct nd_poison *pl;
+
+ pl = kzalloc(sizeof(*pl), GFP_KERNEL);
+ if (!pl)
+ return -ENOMEM;
+
+ pl->start = addr;
+ pl->length = length;
+ list_add_tail(&pl->list, &nvdimm_bus->poison_list);
+
+ return 0;
+}
+
+int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
+{
+ struct nd_poison *pl;
+
+ if (list_empty(&nvdimm_bus->poison_list))
+ return __add_poison(nvdimm_bus, addr, length);
+
+ /*
+ * There is a chance this is a duplicate, check for those first.
+ * This will be the common case as ARS_STATUS returns all known
+ * errors in the SPA space, and we can't query it per region
+ */
+ list_for_each_entry(pl, &nvdimm_bus->poison_list, list)
+ if (pl->start == addr) {
+ /* If length has changed, update this list entry */
+ if (pl->length != length)
+ pl->length = length;
+ return 0;
+ }
+
+ /*
+ * If not a duplicate or a simple length update, add the entry as is,
+ * as any overlapping ranges will get resolved when the list is consumed
+ * and converted to badblocks
+ */
+ return __add_poison(nvdimm_bus, addr, length);
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_add_poison);
+
+static void free_poison_list(struct list_head *poison_list)
+{
+ struct nd_poison *pl, *next;
+
+ list_for_each_entry_safe(pl, next, poison_list, list) {
+ list_del(&pl->list);
+ kfree(pl);
+ }
+ list_del_init(poison_list);
+}
+
static int child_unregister(struct device *dev, void *data)
{
/*
@@ -385,6 +571,7 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
nd_synchronize();
device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
+ free_poison_list(&nvdimm_bus->poison_list);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
device_unregister(&nvdimm_bus->dev);