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| author | Dan Williams <dan.j.williams@intel.com> | 2016-03-11 19:15:36 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-05-10 00:35:42 +0200 |
| commit | cd03412a51ac4cb3001a8cdfae4560c9602f3387 (patch) | |
| tree | c2d501759d7d96fab9a0f70eefba139876bb12de /drivers/nvdimm/region_devs.c | |
| parent | libnvdimm: cleanup nvdimm_namespace_common_probe(), kill 'host' (diff) | |
| download | linux-cd03412a51ac4cb3001a8cdfae4560c9602f3387.tar.xz linux-cd03412a51ac4cb3001a8cdfae4560c9602f3387.zip | |
libnvdimm, dax: introduce device-dax infrastructure
Device DAX is the device-centric analogue of Filesystem DAX
(CONFIG_FS_DAX). It allows persistent memory ranges to be allocated and
mapped without need of an intervening file system. This initial
infrastructure arranges for a libnvdimm pfn-device to be represented as
a different device-type so that it can be attached to a driver other
than the pmem driver.
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 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 139bf71ca549..9e1b054e0e61 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -306,6 +306,23 @@ static ssize_t pfn_seed_show(struct device *dev, } static DEVICE_ATTR_RO(pfn_seed); +static ssize_t dax_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->dax_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(dax_seed); + static ssize_t read_only_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -335,6 +352,7 @@ static struct attribute *nd_region_attributes[] = { &dev_attr_mappings.attr, &dev_attr_btt_seed.attr, &dev_attr_pfn_seed.attr, + &dev_attr_dax_seed.attr, &dev_attr_read_only.attr, &dev_attr_set_cookie.attr, &dev_attr_available_size.attr, @@ -353,6 +371,9 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n) if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr) return 0; + if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr) + return 0; + if (a != &dev_attr_set_cookie.attr && a != &dev_attr_available_size.attr) return a->mode; @@ -441,6 +462,13 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, nd_region_create_pfn_seed(nd_region); nvdimm_bus_unlock(dev); } + if (is_nd_dax(dev) && probe) { + nd_region = to_nd_region(dev->parent); + nvdimm_bus_lock(dev); + if (nd_region->dax_seed == dev) + nd_region_create_dax_seed(nd_region); + nvdimm_bus_unlock(dev); + } } void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev) @@ -718,6 +746,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, ida_init(&nd_region->ns_ida); ida_init(&nd_region->btt_ida); ida_init(&nd_region->pfn_ida); + ida_init(&nd_region->dax_ida); dev = &nd_region->dev; dev_set_name(dev, "region%d", nd_region->id); dev->parent = &nvdimm_bus->dev; |