diff options
Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
| -rw-r--r-- | drivers/nvdimm/pfn_devs.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 613ffcca6ecb..95ecd7b0fab3 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -103,6 +103,52 @@ static ssize_t mode_store(struct device *dev, } static DEVICE_ATTR_RW(mode); +static ssize_t align_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_pfn *nd_pfn = to_nd_pfn(dev); + + return sprintf(buf, "%lx\n", nd_pfn->align); +} + +static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf) +{ + unsigned long val; + int rc; + + rc = kstrtoul(buf, 0, &val); + if (rc) + return rc; + + if (!is_power_of_2(val) || val < PAGE_SIZE || val > SZ_1G) + return -EINVAL; + + if (nd_pfn->dev.driver) + return -EBUSY; + else + nd_pfn->align = val; + + return 0; +} + +static ssize_t align_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_pfn *nd_pfn = to_nd_pfn(dev); + ssize_t rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + rc = __align_store(nd_pfn, buf); + dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, + rc, buf, buf[len - 1] == '\n' ? "" : "\n"); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc ? rc : len; +} +static DEVICE_ATTR_RW(align); + static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -164,6 +210,7 @@ static struct attribute *nd_pfn_attributes[] = { &dev_attr_mode.attr, &dev_attr_namespace.attr, &dev_attr_uuid.attr, + &dev_attr_align.attr, NULL, }; @@ -199,6 +246,7 @@ static struct device *__nd_pfn_create(struct nd_region *nd_region, } nd_pfn->mode = PFN_MODE_NONE; + nd_pfn->align = HPAGE_SIZE; dev = &nd_pfn->dev; dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id); dev->parent = &nd_region->dev; @@ -269,6 +317,12 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn) return -EINVAL; } + if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) { + dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n", + nd_pfn->align, nvdimm_namespace_capacity(ndns)); + return -EINVAL; + } + /* * These warnings are verbose because they can only trigger in * the case where the physical address alignment of the @@ -283,6 +337,13 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn) return -EBUSY; } + nd_pfn->align = 1UL << ilog2(offset); + if (!is_power_of_2(offset) || offset < PAGE_SIZE) { + dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n", + offset); + return -ENXIO; + } + return 0; } EXPORT_SYMBOL(nd_pfn_validate); |