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9f53f9fa4a
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>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/*
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* Copyright (c) 2015, Christoph Hellwig.
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* Copyright (c) 2015, Intel Corporation.
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*/
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#include <linux/platform_device.h>
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#include <linux/libnvdimm.h>
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#include <linux/module.h>
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#include <asm/e820.h>
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static void e820_pmem_release(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = dev->platform_data;
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if (nvdimm_bus)
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nvdimm_bus_unregister(nvdimm_bus);
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}
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static struct platform_device e820_pmem = {
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.name = "e820_pmem",
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.id = -1,
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.dev = {
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.release = e820_pmem_release,
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},
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};
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static const struct attribute_group *e820_pmem_attribute_groups[] = {
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&nvdimm_bus_attribute_group,
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NULL,
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};
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static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
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&nd_region_attribute_group,
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&nd_device_attribute_group,
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NULL,
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};
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static __init int register_e820_pmem(void)
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{
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static struct nvdimm_bus_descriptor nd_desc;
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struct device *dev = &e820_pmem.dev;
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struct nvdimm_bus *nvdimm_bus;
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int rc, i;
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rc = platform_device_register(&e820_pmem);
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if (rc)
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return rc;
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nd_desc.attr_groups = e820_pmem_attribute_groups;
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nd_desc.provider_name = "e820";
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nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
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if (!nvdimm_bus)
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goto err;
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dev->platform_data = nvdimm_bus;
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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struct resource res = {
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.flags = IORESOURCE_MEM,
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.start = ei->addr,
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.end = ei->addr + ei->size - 1,
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};
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struct nd_region_desc ndr_desc;
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if (ei->type != E820_PRAM)
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continue;
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memset(&ndr_desc, 0, sizeof(ndr_desc));
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ndr_desc.res = &res;
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ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
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if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
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goto err;
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}
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return 0;
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err:
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dev_err(dev, "failed to register legacy persistent memory ranges\n");
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platform_device_unregister(&e820_pmem);
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return -ENXIO;
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}
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device_initcall(register_e820_pmem);
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