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authorDan Williams <dan.j.williams@intel.com>2015-05-01 13:11:27 -0400
committerDan Williams <dan.j.williams@intel.com>2015-06-24 21:24:10 -0400
commiteaf961536e1622ad21247ac8d44acd48ba65566e (patch)
tree479b1d2f81f9f8cc9abf99fa8f9b6496cbc88a25 /drivers/nvdimm/core.c
parent9f53f9fa4ad1d8bddd4d14359cdabc531aedffe8 (diff)
downloadlinux-eaf961536e1622ad21247ac8d44acd48ba65566e.tar.bz2
libnvdimm, nfit: add interleave-set state-tracking infrastructure
On platforms that have firmware support for reading/writing per-dimm label space, a portion of the dimm may be accessible via an interleave set PMEM mapping in addition to the dimm's BLK (block-data-window aperture(s)) interface. A label, stored in a "configuration data region" on the dimm, disambiguates which dimm addresses are accessed through which exclusive interface. Add infrastructure that allows the kernel to block modifications to a label in the set while any member dimm is active. Note that this is meant only for enforcing "no modifications of active labels" via the coarse ioctl command. Adding/deleting namespaces from an active interleave set is always possible via sysfs. Another aspect of tracking interleave sets is tracking their integrity when DIMMs in a set are physically re-ordered. For this purpose we generate an "interleave-set cookie" that can be recorded in a label and validated against the current configuration. It is the bus provider implementation's responsibility to calculate the interleave set cookie and attach it to a given region. Cc: Neil Brown <neilb@suse.de> Cc: <linux-acpi@vger.kernel.org> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Robert Moore <robert.moore@intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/core.c')
-rw-r--r--drivers/nvdimm/core.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 1b6b15d11f54..7806eaaf4707 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -54,6 +54,22 @@ bool is_nvdimm_bus_locked(struct device *dev)
}
EXPORT_SYMBOL(is_nvdimm_bus_locked);
+u64 nd_fletcher64(void *addr, size_t len, bool le)
+{
+ u32 *buf = addr;
+ u32 lo32 = 0;
+ u64 hi32 = 0;
+ int i;
+
+ for (i = 0; i < len / sizeof(u32); i++) {
+ lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
+ hi32 += lo32;
+ }
+
+ return hi32 << 32 | lo32;
+}
+EXPORT_SYMBOL_GPL(nd_fletcher64);
+
static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus;
@@ -175,6 +191,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
+ init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
mutex_init(&nvdimm_bus->reconfig_mutex);
if (nvdimm_bus->id < 0) {