diff options
author | Dan Williams <dan.j.williams@intel.com> | 2015-05-19 22:54:31 -0400 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-24 21:24:10 -0400 |
commit | b94d5230d06eb930be82e67fb1a9a58271e78297 (patch) | |
tree | 62ed0e06a81e434dbcbb50a36002bad4eb00b1a1 /drivers/nvdimm/core.c | |
parent | ad5fb870c486d932a1749d7853dd70f436a7e03f (diff) | |
download | linux-b94d5230d06eb930be82e67fb1a9a58271e78297.tar.gz linux-b94d5230d06eb930be82e67fb1a9a58271e78297.tar.bz2 linux-b94d5230d06eb930be82e67fb1a9a58271e78297.zip |
libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
A struct nvdimm_bus is the anchor device for registering nvdimm
resources and interfaces, for example, a character control device,
nvdimm devices, and I/O region devices. The ACPI NFIT (NVDIMM Firmware
Interface Table) is one possible platform description for such
non-volatile memory resources in a system. The nfit.ko driver attaches
to the "ACPI0012" device that indicates the presence of the NFIT and
parses the table to register a struct nvdimm_bus instance.
Cc: <linux-acpi@vger.kernel.org>
Cc: Lv Zheng <lv.zheng@intel.com>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Jeff Moyer <jmoyer@redhat.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>
Diffstat (limited to 'drivers/nvdimm/core.c')
-rw-r--r-- | drivers/nvdimm/core.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c new file mode 100644 index 000000000000..c578a49867ac --- /dev/null +++ b/drivers/nvdimm/core.c @@ -0,0 +1,69 @@ +/* + * 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/libnvdimm.h> +#include <linux/export.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/slab.h> +#include "nd-core.h" + +static DEFINE_IDA(nd_ida); + +static void nvdimm_bus_release(struct device *dev) +{ + struct nvdimm_bus *nvdimm_bus; + + nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); + ida_simple_remove(&nd_ida, nvdimm_bus->id); + kfree(nvdimm_bus); +} + +struct nvdimm_bus *nvdimm_bus_register(struct device *parent, + struct nvdimm_bus_descriptor *nd_desc) +{ + struct nvdimm_bus *nvdimm_bus; + int rc; + + nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); + if (!nvdimm_bus) + return NULL; + nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); + if (nvdimm_bus->id < 0) { + kfree(nvdimm_bus); + return NULL; + } + nvdimm_bus->nd_desc = nd_desc; + nvdimm_bus->dev.parent = parent; + nvdimm_bus->dev.release = nvdimm_bus_release; + dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); + rc = device_register(&nvdimm_bus->dev); + if (rc) { + dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); + put_device(&nvdimm_bus->dev); + return NULL; + } + + return nvdimm_bus; +} +EXPORT_SYMBOL_GPL(nvdimm_bus_register); + +void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) +{ + if (!nvdimm_bus) + return; + device_unregister(&nvdimm_bus->dev); +} +EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Intel Corporation"); |