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-rw-r--r--drivers/nvdimm/btt.c117
-rw-r--r--drivers/nvdimm/btt.h5
-rw-r--r--drivers/nvdimm/claim.c8
3 files changed, 111 insertions, 19 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 9c96530ea6d5..dabb84f7ab8a 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -31,6 +31,11 @@ enum log_ent_request {
LOG_OLD_ENT
};
+static u64 adjust_initial_offset(struct nd_btt *nd_btt, u64 offset)
+{
+ return offset + nd_btt->initial_offset;
+}
+
static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
void *buf, size_t n, unsigned long flags)
{
@@ -38,7 +43,7 @@ static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
struct nd_namespace_common *ndns = nd_btt->ndns;
/* arena offsets may be shifted from the base of the device */
- offset += arena->nd_btt->initial_offset;
+ offset = adjust_initial_offset(nd_btt, offset);
return nvdimm_read_bytes(ndns, offset, buf, n, flags);
}
@@ -49,7 +54,7 @@ static int arena_write_bytes(struct arena_info *arena, resource_size_t offset,
struct nd_namespace_common *ndns = nd_btt->ndns;
/* arena offsets may be shifted from the base of the device */
- offset += arena->nd_btt->initial_offset;
+ offset = adjust_initial_offset(nd_btt, offset);
return nvdimm_write_bytes(ndns, offset, buf, n, flags);
}
@@ -381,7 +386,9 @@ static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub,
arena->freelist[lane].sub = 1 - arena->freelist[lane].sub;
if (++(arena->freelist[lane].seq) == 4)
arena->freelist[lane].seq = 1;
- arena->freelist[lane].block = le32_to_cpu(ent->old_map);
+ if (ent_e_flag(ent->old_map))
+ arena->freelist[lane].has_err = 1;
+ arena->freelist[lane].block = le32_to_cpu(ent_lba(ent->old_map));
return ret;
}
@@ -480,6 +487,40 @@ static int btt_log_init(struct arena_info *arena)
return ret;
}
+static u64 to_namespace_offset(struct arena_info *arena, u64 lba)
+{
+ return arena->dataoff + ((u64)lba * arena->internal_lbasize);
+}
+
+static int arena_clear_freelist_error(struct arena_info *arena, u32 lane)
+{
+ int ret = 0;
+
+ if (arena->freelist[lane].has_err) {
+ void *zero_page = page_address(ZERO_PAGE(0));
+ u32 lba = arena->freelist[lane].block;
+ u64 nsoff = to_namespace_offset(arena, lba);
+ unsigned long len = arena->sector_size;
+
+ mutex_lock(&arena->err_lock);
+
+ while (len) {
+ unsigned long chunk = min(len, PAGE_SIZE);
+
+ ret = arena_write_bytes(arena, nsoff, zero_page,
+ chunk, 0);
+ if (ret)
+ break;
+ len -= chunk;
+ nsoff += chunk;
+ if (len == 0)
+ arena->freelist[lane].has_err = 0;
+ }
+ mutex_unlock(&arena->err_lock);
+ }
+ return ret;
+}
+
static int btt_freelist_init(struct arena_info *arena)
{
int old, new, ret;
@@ -505,6 +546,16 @@ static int btt_freelist_init(struct arena_info *arena)
arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq));
arena->freelist[i].block = le32_to_cpu(log_new.old_map);
+ /*
+ * FIXME: if error clearing fails during init, we want to make
+ * the BTT read-only
+ */
+ if (ent_e_flag(log_new.old_map)) {
+ ret = arena_clear_freelist_error(arena, i);
+ if (ret)
+ WARN_ONCE(1, "Unable to clear known errors\n");
+ }
+
/* This implies a newly created or untouched flog entry */
if (log_new.old_map == log_new.new_map)
continue;
@@ -525,7 +576,6 @@ static int btt_freelist_init(struct arena_info *arena)
if (ret)
return ret;
}
-
}
return 0;
@@ -695,6 +745,7 @@ static int discover_arenas(struct btt *btt)
arena->external_lba_start = cur_nlba;
parse_arena_meta(arena, super, cur_off);
+ mutex_init(&arena->err_lock);
ret = btt_freelist_init(arena);
if (ret)
goto out;
@@ -905,11 +956,6 @@ static void unlock_map(struct arena_info *arena, u32 premap)
spin_unlock(&arena->map_locks[idx].lock);
}
-static u64 to_namespace_offset(struct arena_info *arena, u64 lba)
-{
- return arena->dataoff + ((u64)lba * arena->internal_lbasize);
-}
-
static int btt_data_read(struct arena_info *arena, struct page *page,
unsigned int off, u32 lba, u32 len)
{
@@ -1067,8 +1113,14 @@ static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip,
}
ret = btt_data_read(arena, page, off, postmap, cur_len);
- if (ret)
+ if (ret) {
+ int rc;
+
+ /* Media error - set the e_flag */
+ rc = btt_map_write(arena, premap, postmap, 0, 1,
+ NVDIMM_IO_ATOMIC);
goto out_rtt;
+ }
if (bip) {
ret = btt_rw_integrity(btt, bip, arena, postmap, READ);
@@ -1093,6 +1145,21 @@ static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip,
return ret;
}
+/*
+ * Normally, arena_{read,write}_bytes will take care of the initial offset
+ * adjustment, but in the case of btt_is_badblock, where we query is_bad_pmem,
+ * we need the final, raw namespace offset here
+ */
+static bool btt_is_badblock(struct btt *btt, struct arena_info *arena,
+ u32 postmap)
+{
+ u64 nsoff = adjust_initial_offset(arena->nd_btt,
+ to_namespace_offset(arena, postmap));
+ sector_t phys_sector = nsoff >> 9;
+
+ return is_bad_pmem(btt->phys_bb, phys_sector, arena->internal_lbasize);
+}
+
static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
sector_t sector, struct page *page, unsigned int off,
unsigned int len)
@@ -1105,7 +1172,9 @@ static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
while (len) {
u32 cur_len;
+ int e_flag;
+ retry:
lane = nd_region_acquire_lane(btt->nd_region);
ret = lba_to_arena(btt, sector, &premap, &arena);
@@ -1118,6 +1187,21 @@ static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
goto out_lane;
}
+ if (btt_is_badblock(btt, arena, arena->freelist[lane].block))
+ arena->freelist[lane].has_err = 1;
+
+ if (mutex_is_locked(&arena->err_lock)
+ || arena->freelist[lane].has_err) {
+ nd_region_release_lane(btt->nd_region, lane);
+
+ ret = arena_clear_freelist_error(arena, lane);
+ if (ret)
+ return ret;
+
+ /* OK to acquire a different lane/free block */
+ goto retry;
+ }
+
new_postmap = arena->freelist[lane].block;
/* Wait if the new block is being read from */
@@ -1143,7 +1227,7 @@ static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
}
lock_map(arena, premap);
- ret = btt_map_read(arena, premap, &old_postmap, NULL, NULL,
+ ret = btt_map_read(arena, premap, &old_postmap, NULL, &e_flag,
NVDIMM_IO_ATOMIC);
if (ret)
goto out_map;
@@ -1151,6 +1235,8 @@ static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
ret = -EIO;
goto out_map;
}
+ if (e_flag)
+ set_e_flag(old_postmap);
log.lba = cpu_to_le32(premap);
log.old_map = cpu_to_le32(old_postmap);
@@ -1169,6 +1255,12 @@ static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
unlock_map(arena, premap);
nd_region_release_lane(btt->nd_region, lane);
+ if (e_flag) {
+ ret = arena_clear_freelist_error(arena, lane);
+ if (ret)
+ return ret;
+ }
+
len -= cur_len;
off += cur_len;
sector += btt->sector_size >> SECTOR_SHIFT;
@@ -1349,6 +1441,7 @@ static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize,
{
int ret;
struct btt *btt;
+ struct nd_namespace_io *nsio;
struct device *dev = &nd_btt->dev;
btt = devm_kzalloc(dev, sizeof(struct btt), GFP_KERNEL);
@@ -1362,6 +1455,8 @@ static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize,
INIT_LIST_HEAD(&btt->arena_list);
mutex_init(&btt->init_lock);
btt->nd_region = nd_region;
+ nsio = to_nd_namespace_io(&nd_btt->ndns->dev);
+ btt->phys_bb = &nsio->bb;
ret = discover_arenas(btt);
if (ret) {
diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h
index 2bc0d10b8438..578c2057524d 100644
--- a/drivers/nvdimm/btt.h
+++ b/drivers/nvdimm/btt.h
@@ -15,6 +15,7 @@
#ifndef _LINUX_BTT_H
#define _LINUX_BTT_H
+#include <linux/badblocks.h>
#include <linux/types.h>
#define BTT_SIG_LEN 16
@@ -41,6 +42,7 @@
#define ent_lba(ent) (ent & MAP_LBA_MASK)
#define ent_e_flag(ent) (!!(ent & MAP_ERR_MASK))
#define ent_z_flag(ent) (!!(ent & MAP_TRIM_MASK))
+#define set_e_flag(ent) (ent |= MAP_ERR_MASK)
enum btt_init_state {
INIT_UNCHECKED = 0,
@@ -82,6 +84,7 @@ struct free_entry {
u32 block;
u8 sub;
u8 seq;
+ u8 has_err;
};
struct aligned_lock {
@@ -153,6 +156,7 @@ struct arena_info {
struct dentry *debugfs_dir;
/* Arena flags */
u32 flags;
+ struct mutex err_lock;
};
/**
@@ -187,6 +191,7 @@ struct btt {
struct mutex init_lock;
int init_state;
int num_arenas;
+ struct badblocks *phys_bb;
};
bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super);
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index 3e6404f1ba5a..b2fc29b8279b 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -280,14 +280,6 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
}
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
- /*
- * FIXME: nsio_rw_bytes() may be called from atomic
- * context in the btt case and the ACPI DSM path for
- * clearing the error takes sleeping locks and allocates
- * memory. An explicit error clearing path, and support
- * for tracking badblocks in BTT metadata is needed to
- * work around this collision.
- */
if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
&& !(flags & NVDIMM_IO_ATOMIC)) {
long cleared;