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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);
static bool platform_initialized;
static DEFINE_MUTEX(hmem_resource_lock);
static struct resource hmem_active = {
.name = "HMEM devices",
.start = 0,
.end = -1,
.flags = IORESOURCE_MEM,
};
int walk_hmem_resources(struct device *host, walk_hmem_fn fn)
{
struct resource *res;
int rc = 0;
mutex_lock(&hmem_resource_lock);
for (res = hmem_active.child; res; res = res->sibling) {
rc = fn(host, (int) res->desc, res);
if (rc)
break;
}
mutex_unlock(&hmem_resource_lock);
return rc;
}
EXPORT_SYMBOL_GPL(walk_hmem_resources);
static void __hmem_register_resource(int target_nid, struct resource *res)
{
struct platform_device *pdev;
struct resource *new;
int rc;
new = __request_region(&hmem_active, res->start, resource_size(res), "",
0);
if (!new) {
pr_debug("hmem range %pr already active\n", res);
return;
}
new->desc = target_nid;
if (platform_initialized)
return;
pdev = platform_device_alloc("hmem_platform", 0);
if (!pdev) {
pr_err_once("failed to register device-dax hmem_platform device\n");
return;
}
rc = platform_device_add(pdev);
if (rc)
platform_device_put(pdev);
else
platform_initialized = true;
}
void hmem_register_resource(int target_nid, struct resource *res)
{
if (nohmem)
return;
mutex_lock(&hmem_resource_lock);
__hmem_register_resource(target_nid, res);
mutex_unlock(&hmem_resource_lock);
}
static __init int hmem_register_one(struct resource *res, void *data)
{
hmem_register_resource(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().
*/
device_initcall(hmem_init);
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