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>
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
new file mode 100644
index 0000000..28001a6
--- /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);