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![Dan Williams](/assets/img/avatar_default.png)
Use the new phys_to_target_node() and numa_map_to_online_node() helpers to retrieve the correct id for the 'numa_node' ("local" / online initiator node) and 'target_node' (offline target memory node) sysfs attributes. Below is an example from a 4 NUMA node system where all the memory on node2 is pmem / reserved. It should be noted that with the arrival of the ACPI HMAT table and EFI Specific Purpose Memory the kernel will start to see more platforms with reserved / performance differentiated memory in its own NUMA node. Hence all the stakeholders on the Cc for what is ostensibly a libnvdimm local patch. === Before === /* Notice no online memory on node2 at start */ # numactl --hardware available: 3 nodes (0-1,3) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 node 0 size: 3958 MB node 0 free: 3708 MB node 1 cpus: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 node 1 size: 4027 MB node 1 free: 3871 MB node 3 cpus: node 3 size: 3994 MB node 3 free: 3971 MB node distances: node 0 1 3 0: 10 21 21 1: 21 10 21 3: 21 21 10 /* * Put the pmem namespace into devdax mode so it can be assigned to the * kmem driver */ # ndctl create-namespace -e namespace0.0 -m devdax -f { "dev":"namespace0.0", "mode":"devdax", "map":"dev", "size":"3.94 GiB (4.23 GB)", "uuid":"1650af9b-9ba3-4704-acd6-10178399d9a3", [..] } /* Online Persistent Memory as System RAM */ # daxctl reconfigure-device --mode=system-ram dax0.0 libdaxctl: memblock_in_dev: dax0.0: memory0: Unable to determine phys_index: Success libdaxctl: memblock_in_dev: dax0.0: memory0: Unable to determine phys_index: Success libdaxctl: memblock_in_dev: dax0.0: memory0: Unable to determine phys_index: Success libdaxctl: memblock_in_dev: dax0.0: memory0: Unable to determine phys_index: Success [ { "chardev":"dax0.0", "size":4225761280, "target_node":0, "mode":"system-ram" } ] reconfigured 1 device /* Note that the memory is onlined by default to the wrong node, node0 */ # numactl --hardware available: 3 nodes (0-1,3) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 node 0 size: 7926 MB node 0 free: 7655 MB node 1 cpus: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 node 1 size: 4027 MB node 1 free: 3871 MB node 3 cpus: node 3 size: 3994 MB node 3 free: 3971 MB node distances: node 0 1 3 0: 10 21 21 1: 21 10 21 3: 21 21 10 === After === /* Notice that the "phys_index" error messages are gone */ # daxctl reconfigure-device --mode=system-ram dax0.0 [ { "chardev":"dax0.0", "size":4225761280, "target_node":2, "mode":"system-ram" } ] reconfigured 1 device /* Notice that node2 is now correctly populated */ # numactl --hardware available: 4 nodes (0-3) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 node 0 size: 3958 MB node 0 free: 3793 MB node 1 cpus: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 node 1 size: 4027 MB node 1 free: 3851 MB node 2 cpus: node 2 size: 3968 MB node 2 free: 3968 MB node 3 cpus: node 3 size: 3994 MB node 3 free: 3908 MB node distances: node 0 1 2 3 0: 10 21 21 21 1: 21 10 21 21 2: 21 21 10 21 3: 21 21 21 10 Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Hildenbrand <david@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Link: https://lore.kernel.org/r/158188327614.894464.13122730362187722603.stgit@dwillia2-desk3.amr.corp.intel.com
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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/platform_device.h>
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#include <linux/memory_hotplug.h>
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#include <linux/libnvdimm.h>
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#include <linux/module.h>
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#include <linux/numa.h>
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static int e820_pmem_remove(struct platform_device *pdev)
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{
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struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
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nvdimm_bus_unregister(nvdimm_bus);
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return 0;
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}
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static int e820_register_one(struct resource *res, void *data)
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{
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struct nd_region_desc ndr_desc;
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struct nvdimm_bus *nvdimm_bus = data;
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int nid = phys_to_target_node(res->start);
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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.numa_node = numa_map_to_online_node(nid);
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ndr_desc.target_node = nid;
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set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
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if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
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return -ENXIO;
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return 0;
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}
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static int e820_pmem_probe(struct platform_device *pdev)
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{
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static struct nvdimm_bus_descriptor nd_desc;
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struct device *dev = &pdev->dev;
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struct nvdimm_bus *nvdimm_bus;
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int rc = -ENXIO;
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nd_desc.provider_name = "e820";
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nd_desc.module = THIS_MODULE;
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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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platform_set_drvdata(pdev, nvdimm_bus);
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rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
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IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
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if (rc)
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goto err;
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return 0;
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err:
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nvdimm_bus_unregister(nvdimm_bus);
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dev_err(dev, "failed to register legacy persistent memory ranges\n");
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return rc;
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}
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static struct platform_driver e820_pmem_driver = {
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.probe = e820_pmem_probe,
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.remove = e820_pmem_remove,
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.driver = {
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.name = "e820_pmem",
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},
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};
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module_platform_driver(e820_pmem_driver);
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MODULE_ALIAS("platform:e820_pmem*");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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