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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#include <linux/memremap.h>
#include <linux/rculist.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pfn_t.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/mm.h>
#include "nfit_test.h"
static LIST_HEAD(iomap_head);
static struct iomap_ops {
nfit_test_lookup_fn nfit_test_lookup;
nfit_test_evaluate_dsm_fn evaluate_dsm;
struct list_head list;
} iomap_ops = {
.list = LIST_HEAD_INIT(iomap_ops.list),
};
void nfit_test_setup(nfit_test_lookup_fn lookup,
nfit_test_evaluate_dsm_fn evaluate)
{
iomap_ops.nfit_test_lookup = lookup;
iomap_ops.evaluate_dsm = evaluate;
list_add_rcu(&iomap_ops.list, &iomap_head);
}
EXPORT_SYMBOL(nfit_test_setup);
void nfit_test_teardown(void)
{
list_del_rcu(&iomap_ops.list);
synchronize_rcu();
}
EXPORT_SYMBOL(nfit_test_teardown);
static struct nfit_test_resource *__get_nfit_res(resource_size_t resource)
{
struct iomap_ops *ops;
ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
if (ops)
return ops->nfit_test_lookup(resource);
return NULL;
}
struct nfit_test_resource *get_nfit_res(resource_size_t resource)
{
struct nfit_test_resource *res;
rcu_read_lock();
res = __get_nfit_res(resource);
rcu_read_unlock();
return res;
}
EXPORT_SYMBOL(get_nfit_res);
void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
{
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (nfit_res)
return (void __iomem *) nfit_res->buf + offset
- nfit_res->res.start;
return fallback_fn(offset, size);
}
void __iomem *__wrap_devm_ioremap_nocache(struct device *dev,
resource_size_t offset, unsigned long size)
{
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (nfit_res)
return (void __iomem *) nfit_res->buf + offset
- nfit_res->res.start;
return devm_ioremap_nocache(dev, offset, size);
}
EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
size_t size, unsigned long flags)
{
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (nfit_res)
return nfit_res->buf + offset - nfit_res->res.start;
return devm_memremap(dev, offset, size, flags);
}
EXPORT_SYMBOL(__wrap_devm_memremap);
static void nfit_test_kill(void *_pgmap)
{
struct dev_pagemap *pgmap = _pgmap;
WARN_ON(!pgmap || !pgmap->ref);
if (pgmap->ops && pgmap->ops->kill)
pgmap->ops->kill(pgmap);
else
percpu_ref_kill(pgmap->ref);
if (pgmap->ops && pgmap->ops->cleanup) {
pgmap->ops->cleanup(pgmap);
} else {
wait_for_completion(&pgmap->done);
percpu_ref_exit(pgmap->ref);
}
}
static void dev_pagemap_percpu_release(struct percpu_ref *ref)
{
struct dev_pagemap *pgmap =
container_of(ref, struct dev_pagemap, internal_ref);
complete(&pgmap->done);
}
void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
int error;
resource_size_t offset = pgmap->res.start;
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (!nfit_res)
return devm_memremap_pages(dev, pgmap);
if (!pgmap->ref) {
if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup))
return ERR_PTR(-EINVAL);
init_completion(&pgmap->done);
error = percpu_ref_init(&pgmap->internal_ref,
dev_pagemap_percpu_release, 0, GFP_KERNEL);
if (error)
return ERR_PTR(error);
pgmap->ref = &pgmap->internal_ref;
} else {
if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) {
WARN(1, "Missing reference count teardown definition\n");
return ERR_PTR(-EINVAL);
}
}
error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap);
if (error)
return ERR_PTR(error);
return nfit_res->buf + offset - nfit_res->res.start;
}
EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
{
struct nfit_test_resource *nfit_res = get_nfit_res(addr);
if (nfit_res)
flags &= ~PFN_MAP;
return phys_to_pfn_t(addr, flags);
}
EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
void *__wrap_memremap(resource_size_t offset, size_t size,
unsigned long flags)
{
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (nfit_res)
return nfit_res->buf + offset - nfit_res->res.start;
return memremap(offset, size, flags);
}
EXPORT_SYMBOL(__wrap_memremap);
void __wrap_devm_memunmap(struct device *dev, void *addr)
{
struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
if (nfit_res)
return;
return devm_memunmap(dev, addr);
}
EXPORT_SYMBOL(__wrap_devm_memunmap);
void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
{
return __nfit_test_ioremap(offset, size, ioremap_nocache);
}
EXPORT_SYMBOL(__wrap_ioremap_nocache);
void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
{
return __nfit_test_ioremap(offset, size, ioremap_wc);
}
EXPORT_SYMBOL(__wrap_ioremap_wc);
void __wrap_iounmap(volatile void __iomem *addr)
{
struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
if (nfit_res)
return;
return iounmap(addr);
}
EXPORT_SYMBOL(__wrap_iounmap);
void __wrap_memunmap(void *addr)
{
struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
if (nfit_res)
return;
return memunmap(addr);
}
EXPORT_SYMBOL(__wrap_memunmap);
static bool nfit_test_release_region(struct device *dev,
struct resource *parent, resource_size_t start,
resource_size_t n);
static void nfit_devres_release(struct device *dev, void *data)
{
struct resource *res = *((struct resource **) data);
WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
resource_size(res)));
}
static int match(struct device *dev, void *__res, void *match_data)
{
struct resource *res = *((struct resource **) __res);
resource_size_t start = *((resource_size_t *) match_data);
return res->start == start;
}
static bool nfit_test_release_region(struct device *dev,
struct resource *paren
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