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