libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure

* Implement the device-model infrastructure for loading modules and
  attaching drivers to nvdimm devices.  This is a simple association of a
  nd-device-type number with a driver that has a bitmask of supported
  device types.  To facilitate userspace bind/unbind operations 'modalias'
  and 'devtype', that also appear in the uevent, are added as generic
  sysfs attributes for all nvdimm devices.  The reason for the device-type
  number is to support sub-types within a given parent devtype, be it a
  vendor-specific sub-type or otherwise.

* The first consumer of this infrastructure is the driver
  for dimm devices.  It simply uses control messages to retrieve and
  store the configuration-data image (label set) from each dimm.

Note: nd_device_register() arranges for asynchronous registration of
      nvdimm bus devices by default.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
new file mode 100644
index 000000000000..28001a6ccd4e
--- /dev/null
+++ b/drivers/nvdimm/dimm.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.
+ */
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/sizes.h>
+#include <linux/ndctl.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/nd.h>
+#include "nd.h"
+
+static void free_data(struct nvdimm_drvdata *ndd)
+{
+	if (!ndd)
+		return;
+
+	if (ndd->data && is_vmalloc_addr(ndd->data))
+		vfree(ndd->data);
+	else
+		kfree(ndd->data);
+	kfree(ndd);
+}
+
+static int nvdimm_probe(struct device *dev)
+{
+	struct nvdimm_drvdata *ndd;
+	int rc;
+
+	ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
+	if (!ndd)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, ndd);
+	ndd->dev = dev;
+
+	rc = nvdimm_init_nsarea(ndd);
+	if (rc)
+		goto err;
+
+	rc = nvdimm_init_config_data(ndd);
+	if (rc)
+		goto err;
+
+	dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
+
+	return 0;
+
+ err:
+	free_data(ndd);
+	return rc;
+}
+
+static int nvdimm_remove(struct device *dev)
+{
+	struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+
+	free_data(ndd);
+
+	return 0;
+}
+
+static struct nd_device_driver nvdimm_driver = {
+	.probe = nvdimm_probe,
+	.remove = nvdimm_remove,
+	.drv = {
+		.name = "nvdimm",
+	},
+	.type = ND_DRIVER_DIMM,
+};
+
+int __init nvdimm_init(void)
+{
+	return nd_driver_register(&nvdimm_driver);
+}
+
+void __exit nvdimm_exit(void)
+{
+	driver_unregister(&nvdimm_driver.drv);
+}
+
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);