// SPDX-License-Identifier: GPL-2.0
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#include <linux/platform_device.h>
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#include <linux/memregion.h>
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#include <linux/module.h>
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#include <linux/dax.h>
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#include <linux/mm.h>
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static bool nohmem;
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module_param_named(disable, nohmem, bool, 0444);
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void hmem_register_device(int target_nid, struct resource *r)
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{
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/* define a clean / non-busy resource for the platform device */
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struct resource res = {
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.start = r->start,
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.end = r->end,
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.flags = IORESOURCE_MEM,
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.desc = IORES_DESC_SOFT_RESERVED,
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};
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struct platform_device *pdev;
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struct memregion_info info;
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int rc, id;
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if (nohmem)
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return;
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rc = region_intersects(res.start, resource_size(&res), IORESOURCE_MEM,
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IORES_DESC_SOFT_RESERVED);
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if (rc != REGION_INTERSECTS)
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return;
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id = memregion_alloc(GFP_KERNEL);
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if (id < 0) {
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pr_err("memregion allocation failure for %pr\n", &res);
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return;
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}
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pdev = platform_device_alloc("hmem", id);
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if (!pdev) {
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pr_err("hmem device allocation failure for %pr\n", &res);
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goto out_pdev;
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}
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pdev->dev.numa_node = numa_map_to_online_node(target_nid);
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info = (struct memregion_info) {
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.target_node = target_nid,
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};
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rc = platform_device_add_data(pdev, &info, sizeof(info));
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if (rc < 0) {
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pr_err("hmem memregion_info allocation failure for %pr\n", &res);
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goto out_pdev;
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}
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rc = platform_device_add_resources(pdev, &res, 1);
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if (rc < 0) {
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pr_err("hmem resource allocation failure for %pr\n", &res);
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goto out_resource;
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}
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rc = platform_device_add(pdev);
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if (rc < 0) {
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dev_err(&pdev->dev, "device add failed for %pr\n", &res);
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goto out_resource;
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}
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return;
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out_resource:
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put_device(&pdev->dev);
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out_pdev:
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memregion_free(id);
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}
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static __init int hmem_register_one(struct resource *res, void *data)
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{
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/*
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* If the resource is not a top-level resource it was already
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* assigned to a device by the HMAT parsing.
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*/
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if (res->parent != &iomem_resource) {
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pr_info("HMEM: skip %pr, already claimed\n", res);
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return 0;
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}
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hmem_register_device(phys_to_target_node(res->start), res);
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return 0;
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}
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static __init int hmem_init(void)
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{
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walk_iomem_res_desc(IORES_DESC_SOFT_RESERVED,
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IORESOURCE_MEM, 0, -1, NULL, hmem_register_one);
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return 0;
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}
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/*
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* As this is a fallback for address ranges unclaimed by the ACPI HMAT
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* parsing it must be at an initcall level greater than hmat_init().
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*/
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late_initcall(hmem_init);
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