mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-27 00:10:51 +07:00
11db048643
Now that ZONE_DEVICE depends on SPARSEMEM_VMEMMAP we can simplify some ifdef guards to just ZONE_DEVICE. Link: http://lkml.kernel.org/r/146687646788.39261.8020536391978771940.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reported-by: Vlastimil Babka <vbabka@suse.cz> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
#ifndef _LINUX_MEMREMAP_H_
|
|
#define _LINUX_MEMREMAP_H_
|
|
#include <linux/mm.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/percpu-refcount.h>
|
|
|
|
struct resource;
|
|
struct device;
|
|
|
|
/**
|
|
* struct vmem_altmap - pre-allocated storage for vmemmap_populate
|
|
* @base_pfn: base of the entire dev_pagemap mapping
|
|
* @reserve: pages mapped, but reserved for driver use (relative to @base)
|
|
* @free: free pages set aside in the mapping for memmap storage
|
|
* @align: pages reserved to meet allocation alignments
|
|
* @alloc: track pages consumed, private to vmemmap_populate()
|
|
*/
|
|
struct vmem_altmap {
|
|
const unsigned long base_pfn;
|
|
const unsigned long reserve;
|
|
unsigned long free;
|
|
unsigned long align;
|
|
unsigned long alloc;
|
|
};
|
|
|
|
unsigned long vmem_altmap_offset(struct vmem_altmap *altmap);
|
|
void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
|
|
|
|
#ifdef CONFIG_ZONE_DEVICE
|
|
struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start);
|
|
#else
|
|
static inline struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* struct dev_pagemap - metadata for ZONE_DEVICE mappings
|
|
* @altmap: pre-allocated/reserved memory for vmemmap allocations
|
|
* @res: physical address range covered by @ref
|
|
* @ref: reference count that pins the devm_memremap_pages() mapping
|
|
* @dev: host device of the mapping for debug
|
|
*/
|
|
struct dev_pagemap {
|
|
struct vmem_altmap *altmap;
|
|
const struct resource *res;
|
|
struct percpu_ref *ref;
|
|
struct device *dev;
|
|
};
|
|
|
|
#ifdef CONFIG_ZONE_DEVICE
|
|
void *devm_memremap_pages(struct device *dev, struct resource *res,
|
|
struct percpu_ref *ref, struct vmem_altmap *altmap);
|
|
struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
|
|
#else
|
|
static inline void *devm_memremap_pages(struct device *dev,
|
|
struct resource *res, struct percpu_ref *ref,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
/*
|
|
* Fail attempts to call devm_memremap_pages() without
|
|
* ZONE_DEVICE support enabled, this requires callers to fall
|
|
* back to plain devm_memremap() based on config
|
|
*/
|
|
WARN_ON_ONCE(1);
|
|
return ERR_PTR(-ENXIO);
|
|
}
|
|
|
|
static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn
|
|
* @pfn: page frame number to lookup page_map
|
|
* @pgmap: optional known pgmap that already has a reference
|
|
*
|
|
* @pgmap allows the overhead of a lookup to be bypassed when @pfn lands in the
|
|
* same mapping.
|
|
*/
|
|
static inline struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
|
|
struct dev_pagemap *pgmap)
|
|
{
|
|
const struct resource *res = pgmap ? pgmap->res : NULL;
|
|
resource_size_t phys = PFN_PHYS(pfn);
|
|
|
|
/*
|
|
* In the cached case we're already holding a live reference so
|
|
* we can simply do a blind increment
|
|
*/
|
|
if (res && phys >= res->start && phys <= res->end) {
|
|
percpu_ref_get(pgmap->ref);
|
|
return pgmap;
|
|
}
|
|
|
|
/* fall back to slow path lookup */
|
|
rcu_read_lock();
|
|
pgmap = find_dev_pagemap(phys);
|
|
if (pgmap && !percpu_ref_tryget_live(pgmap->ref))
|
|
pgmap = NULL;
|
|
rcu_read_unlock();
|
|
|
|
return pgmap;
|
|
}
|
|
|
|
static inline void put_dev_pagemap(struct dev_pagemap *pgmap)
|
|
{
|
|
if (pgmap)
|
|
percpu_ref_put(pgmap->ref);
|
|
}
|
|
#endif /* _LINUX_MEMREMAP_H_ */
|