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| author | Dan Williams <dan.j.williams@intel.com> | 2015-07-30 17:57:47 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-08-28 23:39:36 -0400 |
| commit | e1455744b27c9e6115c3508a7b2902157c2c4347 (patch) | |
| tree | 6bfbc5d78269c9389f5bcfc1adc35d4f7f2e6fa4 /drivers/nvdimm/region_devs.c | |
| parent | 96601adb745186ccbcf5b078d4756f13381ec2af (diff) | |
| download | lwn-e1455744b27c9e6115c3508a7b2902157c2c4347.tar.gz lwn-e1455744b27c9e6115c3508a7b2902157c2c4347.zip | |
libnvdimm, pfn: 'struct page' provider infrastructure
Implement the base infrastructure for libnvdimm PFN devices. Similar to
BTT devices they take a namespace as a backing device and layer
functionality on top. In this case the functionality is reserving space
for an array of 'struct page' entries to be handed out through
pfn_to_page(). For now this is just the basic libnvdimm-device-model for
configuring the base PFN device.
As the namespace claiming mechanism for PFN devices is mostly identical
to BTT devices drivers/nvdimm/claim.c is created to house the common
bits.
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 7384455792bf..da4338154ad2 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -345,6 +345,23 @@ static ssize_t btt_seed_show(struct device *dev, } static DEVICE_ATTR_RO(btt_seed); +static ssize_t pfn_seed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + ssize_t rc; + + nvdimm_bus_lock(dev); + if (nd_region->pfn_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(pfn_seed); + static ssize_t read_only_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -373,6 +390,7 @@ static struct attribute *nd_region_attributes[] = { &dev_attr_nstype.attr, &dev_attr_mappings.attr, &dev_attr_btt_seed.attr, + &dev_attr_pfn_seed.attr, &dev_attr_read_only.attr, &dev_attr_set_cookie.attr, &dev_attr_available_size.attr, @@ -744,6 +762,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, nd_region->numa_node = ndr_desc->numa_node; ida_init(&nd_region->ns_ida); ida_init(&nd_region->btt_ida); + ida_init(&nd_region->pfn_ida); dev = &nd_region->dev; dev_set_name(dev, "region%d", nd_region->id); dev->parent = &nvdimm_bus->dev; |