summaryrefslogtreecommitdiff
path: root/drivers/nvdimm/pfn_devs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
-rw-r--r--drivers/nvdimm/pfn_devs.c61
1 files changed, 60 insertions, 1 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 3f7ad5bc443e..24c64090169e 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -361,6 +361,65 @@ struct device *nd_pfn_create(struct nd_region *nd_region)
return dev;
}
+/*
+ * nd_pfn_clear_memmap_errors() clears any errors in the volatile memmap
+ * space associated with the namespace. If the memmap is set to DRAM, then
+ * this is a no-op. Since the memmap area is freshly initialized during
+ * probe, we have an opportunity to clear any badblocks in this area.
+ */
+static int nd_pfn_clear_memmap_errors(struct nd_pfn *nd_pfn)
+{
+ struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
+ struct nd_namespace_common *ndns = nd_pfn->ndns;
+ void *zero_page = page_address(ZERO_PAGE(0));
+ struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+ int num_bad, meta_num, rc, bb_present;
+ sector_t first_bad, meta_start;
+ struct nd_namespace_io *nsio;
+
+ if (nd_pfn->mode != PFN_MODE_PMEM)
+ return 0;
+
+ nsio = to_nd_namespace_io(&ndns->dev);
+ meta_start = (SZ_4K + sizeof(*pfn_sb)) >> 9;
+ meta_num = (le64_to_cpu(pfn_sb->dataoff) >> 9) - meta_start;
+
+ do {
+ unsigned long zero_len;
+ u64 nsoff;
+
+ bb_present = badblocks_check(&nd_region->bb, meta_start,
+ meta_num, &first_bad, &num_bad);
+ if (bb_present) {
+ dev_dbg(&nd_pfn->dev, "meta: %x badblocks at %lx\n",
+ num_bad, first_bad);
+ nsoff = ALIGN_DOWN((nd_region->ndr_start
+ + (first_bad << 9)) - nsio->res.start,
+ PAGE_SIZE);
+ zero_len = ALIGN(num_bad << 9, PAGE_SIZE);
+ while (zero_len) {
+ unsigned long chunk = min(zero_len, PAGE_SIZE);
+
+ rc = nvdimm_write_bytes(ndns, nsoff, zero_page,
+ chunk, 0);
+ if (rc)
+ break;
+
+ zero_len -= chunk;
+ nsoff += chunk;
+ }
+ if (rc) {
+ dev_err(&nd_pfn->dev,
+ "error clearing %x badblocks at %lx\n",
+ num_bad, first_bad);
+ return rc;
+ }
+ }
+ } while (bb_present);
+
+ return 0;
+}
+
int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
{
u64 checksum, offset;
@@ -477,7 +536,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
return -ENXIO;
}
- return 0;
+ return nd_pfn_clear_memmap_errors(nd_pfn);
}
EXPORT_SYMBOL(nd_pfn_validate);