libnvdimm, pmem: add libnvdimm support to the pmem driver
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
parent
18da2c9ee4
commit
9f53f9fa4a
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@ -1424,6 +1424,9 @@ source "mm/Kconfig"
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config X86_PMEM_LEGACY
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bool "Support non-standard NVDIMMs and ADR protected memory"
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depends on PHYS_ADDR_T_64BIT
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depends on BLK_DEV
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select LIBNVDIMM
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help
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Treat memory marked using the non-standard e820 type of 12 as used
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by the Intel Sandy Bridge-EP reference BIOS as protected memory.
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@ -1,53 +1,81 @@
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/*
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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/memblock.h>
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#include <linux/platform_device.h>
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#include <linux/slab.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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#include <asm/page_types.h>
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#include <asm/setup.h>
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static __init void register_pmem_device(struct resource *res)
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static void e820_pmem_release(struct device *dev)
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{
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struct platform_device *pdev;
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int error;
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struct nvdimm_bus *nvdimm_bus = dev->platform_data;
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pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO);
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if (!pdev)
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return;
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error = platform_device_add_resources(pdev, res, 1);
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if (error)
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goto out_put_pdev;
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error = platform_device_add(pdev);
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if (error)
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goto out_put_pdev;
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return;
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out_put_pdev:
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dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n");
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platform_device_put(pdev);
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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 __init int register_pmem_devices(void)
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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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int i;
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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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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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register_pmem_device(&res);
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}
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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_pmem_devices);
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device_initcall(register_e820_pmem);
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@ -1,7 +1,7 @@
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/*
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* Persistent Memory Driver
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*
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* Copyright (c) 2014, Intel Corporation.
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* Copyright (c) 2014-2015, Intel Corporation.
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* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
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* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
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*
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@ -23,8 +23,8 @@
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#define PMEM_MINORS 16
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#include <linux/nd.h>
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#include "nd.h"
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struct pmem_device {
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struct request_queue *pmem_queue;
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@ -37,7 +37,6 @@ struct pmem_device {
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};
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static int pmem_major;
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static atomic_t pmem_index;
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static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
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unsigned int len, unsigned int off, int rw,
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@ -118,11 +117,12 @@ static const struct block_device_operations pmem_fops = {
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.direct_access = pmem_direct_access,
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};
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static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
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static struct pmem_device *pmem_alloc(struct device *dev,
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struct resource *res, int id)
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{
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struct pmem_device *pmem;
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struct gendisk *disk;
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int idx, err;
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int err;
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err = -ENOMEM;
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pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
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@ -134,7 +134,8 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
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err = -EINVAL;
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if (!request_mem_region(pmem->phys_addr, pmem->size, "pmem")) {
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dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", &pmem->phys_addr, pmem->size);
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dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n",
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&pmem->phys_addr, pmem->size);
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goto out_free_dev;
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}
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@ -155,19 +156,17 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
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blk_queue_max_hw_sectors(pmem->pmem_queue, 1024);
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blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
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disk = alloc_disk(PMEM_MINORS);
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disk = alloc_disk(0);
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if (!disk)
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goto out_free_queue;
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idx = atomic_inc_return(&pmem_index) - 1;
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disk->major = pmem_major;
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disk->first_minor = PMEM_MINORS * idx;
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disk->first_minor = 0;
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disk->fops = &pmem_fops;
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disk->private_data = pmem;
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disk->queue = pmem->pmem_queue;
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disk->flags = GENHD_FL_EXT_DEVT;
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sprintf(disk->disk_name, "pmem%d", idx);
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sprintf(disk->disk_name, "pmem%d", id);
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disk->driverfs_dev = dev;
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set_capacity(disk, pmem->size >> 9);
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pmem->pmem_disk = disk;
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@ -198,42 +197,38 @@ static void pmem_free(struct pmem_device *pmem)
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kfree(pmem);
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}
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static int pmem_probe(struct platform_device *pdev)
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static int nd_pmem_probe(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
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struct pmem_device *pmem;
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struct resource *res;
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if (WARN_ON(pdev->num_resources > 1))
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return -ENXIO;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENXIO;
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pmem = pmem_alloc(&pdev->dev, res);
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pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
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if (IS_ERR(pmem))
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return PTR_ERR(pmem);
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platform_set_drvdata(pdev, pmem);
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dev_set_drvdata(dev, pmem);
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return 0;
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}
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static int pmem_remove(struct platform_device *pdev)
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static int nd_pmem_remove(struct device *dev)
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{
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struct pmem_device *pmem = platform_get_drvdata(pdev);
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struct pmem_device *pmem = dev_get_drvdata(dev);
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pmem_free(pmem);
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return 0;
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}
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static struct platform_driver pmem_driver = {
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.probe = pmem_probe,
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.remove = pmem_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "pmem",
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MODULE_ALIAS("pmem");
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
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static struct nd_device_driver nd_pmem_driver = {
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.probe = nd_pmem_probe,
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.remove = nd_pmem_remove,
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.drv = {
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.name = "nd_pmem",
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},
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.type = ND_DRIVER_NAMESPACE_IO,
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};
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static int __init pmem_init(void)
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@ -244,16 +239,19 @@ static int __init pmem_init(void)
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if (pmem_major < 0)
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return pmem_major;
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error = platform_driver_register(&pmem_driver);
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if (error)
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error = nd_driver_register(&nd_pmem_driver);
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if (error) {
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unregister_blkdev(pmem_major, "pmem");
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return error;
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return error;
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}
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return 0;
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}
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module_init(pmem_init);
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static void pmem_exit(void)
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{
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platform_driver_unregister(&pmem_driver);
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driver_unregister(&nd_pmem_driver.drv);
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unregister_blkdev(pmem_major, "pmem");
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}
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module_exit(pmem_exit);
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