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Diffstat (limited to 'drivers/nvdimm/pmem.c')
-rw-r--r--drivers/nvdimm/pmem.c90
1 files changed, 62 insertions, 28 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 8ee79893d2f5..b493ff3fccb2 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/memory_hotplug.h>
#include <linux/moduleparam.h>
+#include <linux/badblocks.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/pmem.h>
@@ -41,11 +42,25 @@ struct pmem_device {
phys_addr_t data_offset;
void __pmem *virt_addr;
size_t size;
+ struct badblocks bb;
};
static int pmem_major;
-static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
+static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len)
+{
+ if (bb->count) {
+ sector_t first_bad;
+ int num_bad;
+
+ return !!badblocks_check(bb, sector, len / 512, &first_bad,
+ &num_bad);
+ }
+
+ return false;
+}
+
+static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
unsigned int len, unsigned int off, int rw,
sector_t sector)
{
@@ -54,6 +69,8 @@ static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
if (rw == READ) {
+ if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
+ return -EIO;
memcpy_from_pmem(mem + off, pmem_addr, len);
flush_dcache_page(page);
} else {
@@ -62,10 +79,12 @@ static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
}
kunmap_atomic(mem);
+ return 0;
}
static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
{
+ int rc = 0;
bool do_acct;
unsigned long start;
struct bio_vec bvec;
@@ -74,9 +93,15 @@ static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
struct pmem_device *pmem = bdev->bd_disk->private_data;
do_acct = nd_iostat_start(bio, &start);
- bio_for_each_segment(bvec, bio, iter)
- pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, bvec.bv_offset,
- bio_data_dir(bio), iter.bi_sector);
+ bio_for_each_segment(bvec, bio, iter) {
+ rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
+ bvec.bv_offset, bio_data_dir(bio),
+ iter.bi_sector);
+ if (rc) {
+ bio->bi_error = rc;
+ break;
+ }
+ }
if (do_acct)
nd_iostat_end(bio, start);
@@ -91,13 +116,22 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
struct page *page, int rw)
{
struct pmem_device *pmem = bdev->bd_disk->private_data;
+ int rc;
- pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector);
+ rc = pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector);
if (rw & WRITE)
wmb_pmem();
- page_endio(page, rw & WRITE, 0);
- return 0;
+ /*
+ * The ->rw_page interface is subtle and tricky. The core
+ * retries on any error, so we can only invoke page_endio() in
+ * the successful completion case. Otherwise, we'll see crashes
+ * caused by double completion.
+ */
+ if (rc == 0)
+ page_endio(page, rw & WRITE, 0);
+
+ return rc;
}
static long pmem_direct_access(struct block_device *bdev, sector_t sector,
@@ -195,7 +229,12 @@ static int pmem_attach_disk(struct device *dev,
disk->driverfs_dev = dev;
set_capacity(disk, (pmem->size - pmem->data_offset) / 512);
pmem->pmem_disk = disk;
+ devm_exit_badblocks(dev, &pmem->bb);
+ if (devm_init_badblocks(dev, &pmem->bb))
+ return -ENOMEM;
+ nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset);
+ disk->bb = &pmem->bb;
add_disk(disk);
revalidate_disk(disk);
@@ -212,9 +251,13 @@ static int pmem_rw_bytes(struct nd_namespace_common *ndns,
return -EFAULT;
}
- if (rw == READ)
+ if (rw == READ) {
+ unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
+
+ if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
+ return -EIO;
memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
- else {
+ } else {
memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
wmb_pmem();
}
@@ -238,14 +281,11 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
nd_pfn->pfn_sb = pfn_sb;
rc = nd_pfn_validate(nd_pfn);
- if (rc == 0 || rc == -EBUSY)
+ if (rc == -ENODEV)
+ /* no info block, do init */;
+ else
return rc;
- /* section alignment for simple hotplug */
- if (nvdimm_namespace_capacity(ndns) < ND_PFN_ALIGN
- || pmem->phys_addr & ND_PFN_MASK)
- return -ENODEV;
-
nd_region = to_nd_region(nd_pfn->dev.parent);
if (nd_region->ro) {
dev_info(&nd_pfn->dev,
@@ -263,9 +303,9 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
* ->direct_access() to those that are included in the memmap.
*/
if (nd_pfn->mode == PFN_MODE_PMEM)
- offset = ALIGN(SZ_8K + 64 * npfns, PMD_SIZE);
+ offset = ALIGN(SZ_8K + 64 * npfns, nd_pfn->align);
else if (nd_pfn->mode == PFN_MODE_RAM)
- offset = SZ_8K;
+ offset = ALIGN(SZ_8K, nd_pfn->align);
else
goto err;
@@ -275,6 +315,7 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
pfn_sb->npfns = cpu_to_le64(npfns);
memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN);
memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
+ memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
pfn_sb->version_major = cpu_to_le16(1);
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
pfn_sb->checksum = cpu_to_le64(checksum);
@@ -326,21 +367,11 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
if (rc)
return rc;
- if (PAGE_SIZE != SZ_4K) {
- dev_err(dev, "only supported on systems with 4K PAGE_SIZE\n");
- return -ENXIO;
- }
- if (nsio->res.start & ND_PFN_MASK) {
- dev_err(dev, "%s not memory hotplug section aligned\n",
- dev_name(&ndns->dev));
- return -ENXIO;
- }
-
pfn_sb = nd_pfn->pfn_sb;
offset = le64_to_cpu(pfn_sb->dataoff);
nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
if (nd_pfn->mode == PFN_MODE_RAM) {
- if (offset != SZ_8K)
+ if (offset < SZ_8K)
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
altmap = NULL;
@@ -389,6 +420,9 @@ static int nd_pmem_probe(struct device *dev)
pmem->ndns = ndns;
dev_set_drvdata(dev, pmem);
ndns->rw_bytes = pmem_rw_bytes;
+ if (devm_init_badblocks(dev, &pmem->bb))
+ return -ENOMEM;
+ nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
if (is_nd_btt(dev))
return nvdimm_namespace_attach_btt(ndns);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 17:19:09 +0100