libnvdimm, nfit: dimm/memory-devices
Enable nvdimm devices to be registered on a nvdimm_bus. The kernel
assigned device id for nvdimm devicesis dynamic. If userspace needs a
more static identifier it should consult a provider-specific attribute.
In the case where NFIT is the provider, the 'nmemX/nfit/handle' or
'nmemX/nfit/serial' attributes may be used for this purpose.
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>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
new file mode 100644
index 0000000..51ea52c
--- /dev/null
+++ b/drivers/nvdimm/dimm_devs.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include "nd-core.h"
+
+static DEFINE_IDA(dimm_ida);
+
+static void nvdimm_release(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+
+ ida_simple_remove(&dimm_ida, nvdimm->id);
+ kfree(nvdimm);
+}
+
+static struct device_type nvdimm_device_type = {
+ .name = "nvdimm",
+ .release = nvdimm_release,
+};
+
+static bool is_nvdimm(struct device *dev)
+{
+ return dev->type == &nvdimm_device_type;
+}
+
+struct nvdimm *to_nvdimm(struct device *dev)
+{
+ struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
+
+ WARN_ON(!is_nvdimm(dev));
+ return nvdimm;
+}
+EXPORT_SYMBOL_GPL(to_nvdimm);
+
+const char *nvdimm_name(struct nvdimm *nvdimm)
+{
+ return dev_name(&nvdimm->dev);
+}
+EXPORT_SYMBOL_GPL(nvdimm_name);
+
+void *nvdimm_provider_data(struct nvdimm *nvdimm)
+{
+ return nvdimm->provider_data;
+}
+EXPORT_SYMBOL_GPL(nvdimm_provider_data);
+
+struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
+ const struct attribute_group **groups, unsigned long flags)
+{
+ struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
+ struct device *dev;
+
+ if (!nvdimm)
+ return NULL;
+
+ nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
+ if (nvdimm->id < 0) {
+ kfree(nvdimm);
+ return NULL;
+ }
+ nvdimm->provider_data = provider_data;
+ nvdimm->flags = flags;
+
+ dev = &nvdimm->dev;
+ dev_set_name(dev, "nmem%d", nvdimm->id);
+ dev->parent = &nvdimm_bus->dev;
+ dev->type = &nvdimm_device_type;
+ dev->bus = &nvdimm_bus_type;
+ dev->groups = groups;
+ if (device_register(dev) != 0) {
+ put_device(dev);
+ return NULL;
+ }
+
+ return nvdimm;
+}
+EXPORT_SYMBOL_GPL(nvdimm_create);