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| author | Dan Williams <dan.j.williams@intel.com> | 2017-05-01 20:00:02 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-05-01 20:00:02 +0300 |
| commit | a3e9af95f794d000debc2a5ba3186ba85a6e115f (patch) | |
| tree | 2450d68251fd90f469ca0a91e3ade228ca63f1b9 /drivers/nvdimm | |
| parent | 452bae0aede774f87bf56c28b6dd50b72c78986c (diff) | |
| download | linux-a3e9af95f794d000debc2a5ba3186ba85a6e115f.tar.xz | |
libnvdimm: restore "libnvdimm: band aid btt vs clear poison locking"
This continues the 4.11 status quo of disabling of error clearing from
the BTT I/O path. Toshi found that even though we have eliminated all
the libnvdimm sources of sleeping-while-atomic triggers, we still have
sleeping operations that will occur in the path to send the ACPI DSM to
the DIMM to clear the error:
BUG: sleeping function called from invalid context at mm/slab.h:432
in_atomic(): 1, irqs_disabled(): 0, pid: 13353, name: dd
Call Trace:
dump_stack+0x86/0xc3
___might_sleep+0x17d/0x250
__might_sleep+0x4a/0x80
__kmalloc+0x1c0/0x2e0
acpi_os_allocate_zeroed+0x2d/0x2f
acpi_evaluate_object+0x59/0x3b1
acpi_evaluate_dsm+0xbd/0x10c
acpi_nfit_ctl+0x1ef/0x7c0 [nfit]
? nsio_rw_bytes+0x152/0x280
nvdimm_clear_poison+0x77/0x140
nsio_rw_bytes+0x18f/0x280
btt_write_pg+0x1d4/0x3d0 [nd_btt]
btt_make_request+0x119/0x2d0 [nd_btt]
A solution for tracking and handling media errors natively in the BTT is
needed.
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/claim.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c index 35b210dc1e56..6945e35058bf 100644 --- a/drivers/nvdimm/claim.c +++ b/drivers/nvdimm/claim.c @@ -250,7 +250,16 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns, } if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) { - if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)) { + /* + * 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) + && (!ndns->claim || !is_nd_btt(ndns->claim))) { long cleared; cleared = nvdimm_clear_poison(&ndns->dev, |