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libnvdimm, pmem: add libnvdimm support to the pmem driver

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nd_pmem attaches to persistent memory regions and namespaces emitted by
the libnvdimm subsystem, and, same as the original pmem driver, presents
the system-physical-address range as a block device.

The existing e820-type-12 to pmem setup is converted to an nvdimm_bus
that emits an nd_namespace_io device.

Note that the X in 'pmemX' is now derived from the parent region.  This
provides some stability to the pmem devices names from boot-to-boot.
The minor numbers are also more predictable by passing 0 to
alloc_disk().

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
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>
This commit is contained in:
Dan Williams
2015-06-09 15:33:45 -04:00
parent 18da2c9ee4
commit 9f53f9fa4a
3 changed files with 98 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

96
arch/x86/kernel/pmem.c
View File

@@ -1,53 +1,81 @@
/*
* Copyright (c) 2015, Christoph Hellwig.
* Copyright (c) 2015, Intel Corporation.
*/
#include <linux/memblock.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>
#include <asm/e820.h>
#include <asm/page_types.h>
#include <asm/setup.h>
static __init void register_pmem_device(struct resource *res)
static void e820_pmem_release(struct device *dev)
{
struct platform_device *pdev;
int error;
struct nvdimm_bus *nvdimm_bus = dev->platform_data;
pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO);
if (!pdev)
return;
error = platform_device_add_resources(pdev, res, 1);
if (error)
goto out_put_pdev;
error = platform_device_add(pdev);
if (error)
goto out_put_pdev;
return;
out_put_pdev:
dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n");
platform_device_put(pdev);
if (nvdimm_bus)
nvdimm_bus_unregister(nvdimm_bus);
}
static __init int register_pmem_devices(void)
static struct platform_device e820_pmem = {
.name = "e820_pmem",
.id = -1,
.dev = {
.release = e820_pmem_release,
},
};
static const struct attribute_group *e820_pmem_attribute_groups[] = {
&nvdimm_bus_attribute_group,
NULL,
};
static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
&nd_region_attribute_group,
&nd_device_attribute_group,
NULL,
};
static __init int register_e820_pmem(void)
{
int i;
static struct nvdimm_bus_descriptor nd_desc;
struct device *dev = &e820_pmem.dev;
struct nvdimm_bus *nvdimm_bus;
int rc, i;
rc = platform_device_register(&e820_pmem);
if (rc)
return rc;
nd_desc.attr_groups = e820_pmem_attribute_groups;
nd_desc.provider_name = "e820";
nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
if (!nvdimm_bus)
goto err;
dev->platform_data = nvdimm_bus;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
struct resource res = {
.flags = IORESOURCE_MEM,
.start = ei->addr,
.end = ei->addr + ei->size - 1,
};
struct nd_region_desc ndr_desc;
if (ei->type == E820_PRAM) {
struct resource res = {
.flags = IORESOURCE_MEM,
.start = ei->addr,
.end = ei->addr + ei->size - 1,
};
register_pmem_device(&res);
}
if (ei->type != E820_PRAM)
continue;
memset(&ndr_desc, 0, sizeof(ndr_desc));
ndr_desc.res = &res;
ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
goto err;
}
return 0;
err:
dev_err(dev, "failed to register legacy persistent memory ranges\n");
platform_device_unregister(&e820_pmem);
return -ENXIO;
}
device_initcall(register_pmem_devices);
device_initcall(register_e820_pmem);