* General Public License for more details.
*/
#include <linux/libnvdimm.h>
+#include <linux/badblocks.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/blkdev.h>
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);
}
EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
+static void set_badblock(struct badblocks *bb, sector_t s, int num)
+{
+ dev_dbg(bb->dev, "Found a poison range (0x%llx, 0x%llx)\n",
+ (u64) s * 512, (u64) num * 512);
+ /* this isn't an error as the hardware will still throw an exception */
+ if (badblocks_set(bb, s, num, 1))
+ dev_info_once(bb->dev, "%s: failed for sector %llx\n",
+ __func__, (u64) s);
+}
+
+/**
+ * __add_badblock_range() - Convert a physical address range to bad sectors
+ * @bb: badblocks instance to populate
+ * @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 void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len)
+{
+ const unsigned int sector_size = 512;
+ sector_t start_sector;
+ u64 num_sectors;
+ u32 rem;
+
+ start_sector = div_u64(ns_offset, sector_size);
+ num_sectors = div_u64_rem(len, sector_size, &rem);
+ if (rem)
+ num_sectors++;
+
+ 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);
+
+ set_badblock(bb, s, done);
+ remaining -= done;
+ s += done;
+ }
+ } else
+ set_badblock(bb, start_sector, num_sectors);
+}
+
+/**
+ * nvdimm_namespace_add_poison() - Convert a list of poison ranges to badblocks
+ * @ndns: the namespace containing poison ranges
+ * @bb: badblocks instance to populate
+ * @offset: offset at the start of the namespace before 'sector 0'
+ *
+ * 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
+ */
+void nvdimm_namespace_add_poison(struct nd_namespace_common *ndns,
+ struct badblocks *bb, resource_size_t offset)
+{
+ 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;
+
+ 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;
+
+ 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;
+ __add_badblock_range(bb, start - ns_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;
+ __add_badblock_range(bb, 0, len);
+ }
+ }
+}
+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)
{
/*
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);
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