diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2016-03-08 07:16:07 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-03-09 15:15:32 -0800 |
| commit | 59e6473980f321c16299e12db69d1fabc2644a6f (patch) | |
| tree | 6c59e4bb7a8a0f2208269643f5b7b8b056680aef /drivers/nvdimm/pmem.c | |
| parent | b5ebc8ec693281c3c1efff7459a069cbd8b9a149 (diff) | |
libnvdimm, pmem: clear poison on write
If a write is directed at a known bad block perform the following:
1/ write the data
2/ send a clear poison command
3/ invalidate the poison out of the cache hierarchy
Cc: <x86@kernel.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/pmem.c')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index e7b86a7fca0a..adc387236fe7 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -62,17 +62,40 @@ static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len) return false; } +static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset, + unsigned int len) +{ + struct device *dev = disk_to_dev(pmem->pmem_disk); + sector_t sector; + long cleared; + + sector = (offset - pmem->data_offset) / 512; + cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len); + + if (cleared > 0 && cleared / 512) { + dev_dbg(dev, "%s: %llx clear %ld sector%s\n", + __func__, (unsigned long long) sector, + cleared / 512, cleared / 512 > 1 ? "s" : ""); + badblocks_clear(&pmem->bb, sector, cleared / 512); + } + invalidate_pmem(pmem->virt_addr + offset, len); +} + static int pmem_do_bvec(struct pmem_device *pmem, struct page *page, unsigned int len, unsigned int off, int rw, sector_t sector) { int rc = 0; + bool bad_pmem = false; void *mem = kmap_atomic(page); phys_addr_t pmem_off = sector * 512 + pmem->data_offset; void __pmem *pmem_addr = pmem->virt_addr + pmem_off; + if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) + bad_pmem = true; + if (rw == READ) { - if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) + if (unlikely(bad_pmem)) rc = -EIO; else { memcpy_from_pmem(mem + off, pmem_addr, len); @@ -81,6 +104,10 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page, } else { flush_dcache_page(page); memcpy_to_pmem(pmem_addr, mem + off, len); + if (unlikely(bad_pmem)) { + pmem_clear_poison(pmem, pmem_off, len); + memcpy_to_pmem(pmem_addr, mem + off, len); + } } kunmap_atomic(mem); |