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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d76401ade0
There is currently a mismatch between the resources that will trigger
the e820_pmem driver to register/load and the resources that will
actually be surfaced as pmem ranges. register_e820_pmem() uses
walk_iomem_res_desc() which includes children and siblings. In contrast,
e820_pmem_probe() only considers top level resources. For example the
following resource tree results in the driver being loaded, but no
resources being registered:
398000000000-39bfffffffff : PCI Bus 0000:ae
39be00000000-39bf07ffffff : PCI Bus 0000:af
39be00000000-39beffffffff : 0000:af:00.0
39be10000000-39beffffffff : Persistent Memory (legacy)
Fix this up to allow definitions of "legacy" pmem ranges anywhere in
system-physical address space. Not that it is a recommended or safe to
define a pmem range in PCI space, but it is useful for debug /
experimentation, and the restriction on being a top-level resource was
arbitrary.
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
95 lines
2.3 KiB
C
95 lines
2.3 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/memory_hotplug.h>
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#include <linux/libnvdimm.h>
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#include <linux/module.h>
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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 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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#ifdef CONFIG_MEMORY_HOTPLUG
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static int e820_range_to_nid(resource_size_t addr)
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{
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return memory_add_physaddr_to_nid(addr);
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}
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#else
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static int e820_range_to_nid(resource_size_t addr)
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{
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return NUMA_NO_NODE;
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}
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#endif
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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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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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ndr_desc.numa_node = e820_range_to_nid(res->start);
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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.attr_groups = e820_pmem_attribute_groups;
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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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