diff options
| author |   Dan Williams <dan.j.williams@intel.com> | 2017-06-09 09:46:50 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-06-29 09:29:50 -0700 |
| commit | 0b277961f4484fb3f142caaa1dd1748cb0b2cbee (patch) | |
| tree | c3ba6190530a8732a64df8e2dba2c6028d36a2eb /drivers/nvdimm/pmem.c | |
| parent | libnvdimm, pmem, dax: export a cache control attribute (diff) | |
| download | linux-dev-0b277961f4484fb3f142caaa1dd1748cb0b2cbee.tar.xz linux-dev-0b277961f4484fb3f142caaa1dd1748cb0b2cbee.zip | |
libnvdimm, pmem: disable dax flushing when pmem is fronting a volatile region
The pmem driver attaches to both persistent and volatile memory ranges
advertised by the ACPI NFIT. When the region is volatile it is redundant
to spend cycles flushing caches at fsync(). Check if the hosting region
is volatile and do not set dax_write_cache() if it is.
Cc: Jan Kara <jack@suse.cz>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.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 | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 7339d184070e..e7a40f77f729 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -284,10 +284,10 @@ static int pmem_attach_disk(struct device *dev, struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); struct nd_region *nd_region = to_nd_region(dev->parent); struct vmem_altmap __altmap, *altmap = NULL; + int nid = dev_to_node(dev), fua, wbc; struct resource *res = &nsio->res; struct nd_pfn *nd_pfn = NULL; struct dax_device *dax_dev; - int nid = dev_to_node(dev); struct nd_pfn_sb *pfn_sb; struct pmem_device *pmem; struct resource pfn_res; @@ -314,9 +314,12 @@ static int pmem_attach_disk(struct device *dev, dev_set_drvdata(dev, pmem); pmem->phys_addr = res->start; pmem->size = resource_size(res); - if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) - || nvdimm_has_flush(nd_region) < 0) + fua = nvdimm_has_flush(nd_region); + if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { dev_warn(dev, "unable to guarantee persistence of writes\n"); + fua = 0; + } + wbc = nvdimm_has_cache(nd_region); if (!devm_request_mem_region(dev, res->start, resource_size(res), dev_name(&ndns->dev))) { @@ -360,7 +363,7 @@ static int pmem_attach_disk(struct device *dev, return PTR_ERR(addr); pmem->virt_addr = addr; - blk_queue_write_cache(q, true, true); + blk_queue_write_cache(q, wbc, fua); blk_queue_make_request(q, pmem_make_request); blk_queue_physical_block_size(q, PAGE_SIZE); blk_queue_max_hw_sectors(q, UINT_MAX); @@ -390,7 +393,7 @@ static int pmem_attach_disk(struct device *dev, put_disk(disk); return -ENOMEM; } - dax_write_cache(dax_dev, true); + dax_write_cache(dax_dev, wbc); pmem->dax_dev = dax_dev; gendev = disk_to_dev(disk); |