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authorDan Williams <dan.j.williams@intel.com>2015-05-19 22:54:31 -0400
committerDan Williams <dan.j.williams@intel.com>2015-06-24 21:24:10 -0400
commitb94d5230d06eb930be82e67fb1a9a58271e78297 (patch)
tree62ed0e06a81e434dbcbb50a36002bad4eb00b1a1 /drivers/nvdimm
parentad5fb870c486d932a1749d7853dd70f436a7e03f (diff)
downloadlwn-b94d5230d06eb930be82e67fb1a9a58271e78297.tar.gz
lwn-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')
-rw-r--r--drivers/nvdimm/Kconfig15
-rw-r--r--drivers/nvdimm/Makefile3
-rw-r--r--drivers/nvdimm/core.c69
-rw-r--r--drivers/nvdimm/nd-core.h23
4 files changed, 110 insertions, 0 deletions
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
new file mode 100644
index 000000000000..92933551f846
--- /dev/null
+++ b/drivers/nvdimm/Kconfig
@@ -0,0 +1,15 @@
+config LIBNVDIMM
+ tristate "NVDIMM (Non-Volatile Memory Device) Support"
+ depends on PHYS_ADDR_T_64BIT
+ depends on BLK_DEV
+ help
+ Generic support for non-volatile memory devices including
+ ACPI-6-NFIT defined resources. On platforms that define an
+ NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
+ bus is registered to advertise PMEM (persistent memory)
+ namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
+ namespaces (/dev/ndX). A PMEM namespace refers to a memory
+ resource that may span multiple DIMMs and support DAX (see
+ CONFIG_DAX). A BLK namespace refers to an NVDIMM control
+ region which exposes an mmio register set for windowed
+ access mode to non-volatile memory.
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
new file mode 100644
index 000000000000..10bc7af47992
--- /dev/null
+++ b/drivers/nvdimm/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
+
+libnvdimm-y := core.o
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");
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
new file mode 100644
index 000000000000..291b2fdcd96b
--- /dev/null
+++ b/drivers/nvdimm/nd-core.h
@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+#ifndef __ND_CORE_H__
+#define __ND_CORE_H__
+#include <linux/libnvdimm.h>
+#include <linux/device.h>
+
+struct nvdimm_bus {
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct device dev;
+ int id;
+};
+#endif /* __ND_CORE_H__ */