@@ -712,7 +712,7 @@ static struct page *kvmppc_uvmem_get_page(unsigned long gpa, struct kvm *kvm)
dpage = pfn_to_page(uvmem_pfn);
dpage->zone_device_data = pvt;
- get_page(dpage);
+ init_page_count(dpage);
lock_page(dpage);
return dpage;
out_clear:
@@ -224,7 +224,8 @@ svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn)
page = pfn_to_page(pfn);
svm_range_bo_ref(prange->svm_bo);
page->zone_device_data = prange->svm_bo;
- get_page(page);
+ VM_BUG_ON_PAGE(page_ref_count(page), page);
+ init_page_count(page);
lock_page(page);
}
@@ -324,7 +324,7 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
return NULL;
}
- get_page(page);
+ init_page_count(page);
lock_page(page);
return page;
}
@@ -572,14 +572,14 @@ static void *grab_mapping_entry(struct xa_state *xas,
/**
* dax_layout_busy_page_range - find first pinned page in @mapping
- * @mapping: address space to scan for a page with ref count > 1
+ * @mapping: address space to scan for a page with ref count > 0
* @start: Starting offset. Page containing 'start' is included.
* @end: End offset. Page containing 'end' is included. If 'end' is LLONG_MAX,
* pages from 'start' till the end of file are included.
*
* DAX requires ZONE_DEVICE mapped pages. These pages are never
* 'onlined' to the page allocator so they are considered idle when
- * page->count == 1. A filesystem uses this interface to determine if
+ * page->count == 0. A filesystem uses this interface to determine if
* any page in the mapping is busy, i.e. for DMA, or other
* get_user_pages() usages.
*
@@ -218,7 +218,7 @@ static inline bool dax_mapping(struct address_space *mapping)
static inline bool dax_page_unused(struct page *page)
{
- return page_ref_count(page) == 1;
+ return page_ref_count(page) == 0;
}
#define dax_wait_page(_inode, _page, _wait_cb) \
@@ -74,9 +74,10 @@ enum memory_type {
struct dev_pagemap_ops {
/*
- * Called once the page refcount reaches 1. (ZONE_DEVICE pages never
- * reach 0 refcount unless there is a refcount bug. This allows the
- * device driver to implement its own memory management.)
+ * Called once the page refcount reaches 0. The reference count
+ * should be reset to one with init_page_count(page) before reusing
+ * the page. This allows the device driver to implement its own
+ * memory management.
*/
void (*page_free)(struct page *page);
@@ -1241,17 +1241,6 @@ static inline void put_page(struct page *page)
{
page = compound_head(page);
- /*
- * For devmap managed pages we need to catch refcount transition from
- * 2 to 1, when refcount reach one it means the page is free and we
- * need to inform the device driver through callback. See
- * include/linux/memremap.h and HMM for details.
- */
- if (page_is_devmap_managed(page)) {
- put_devmap_managed_page(page);
- return;
- }
-
if (put_page_testzero(page))
__put_page(page);
}
@@ -595,7 +595,7 @@ static struct page *dmirror_devmem_alloc_page(struct dmirror_device *mdevice)
}
dpage->zone_device_data = rpage;
- get_page(dpage);
+ init_page_count(dpage);
lock_page(dpage);
return dpage;
@@ -670,5 +670,12 @@ void vunmap_range_noflush(unsigned long start, unsigned long end);
int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
unsigned long addr, int page_nid, int *flags);
+#ifdef CONFIG_DEV_PAGEMAP_OPS
+void free_zone_device_page(struct page *page);
+#else
+static inline void free_zone_device_page(struct page *page)
+{
+}
+#endif
#endif /* __MM_INTERNAL_H */
@@ -5515,11 +5515,7 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
*/
if (is_device_private_entry(ent)) {
page = pfn_swap_entry_to_page(ent);
- /*
- * MEMORY_DEVICE_PRIVATE means ZONE_DEVICE page and which have
- * a refcount of 1 when free (unlike normal page)
- */
- if (!page_ref_add_unless(page, 1, 1))
+ if (!get_page_unless_zero(page))
return NULL;
return page;
}
@@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/wait_bit.h>
#include <linux/xarray.h>
+#include "internal.h"
static DEFINE_XARRAY(pgmap_array);
@@ -37,34 +38,6 @@ unsigned long memremap_compat_align(void)
EXPORT_SYMBOL_GPL(memremap_compat_align);
#endif
-#ifdef CONFIG_DEV_PAGEMAP_OPS
-DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
-EXPORT_SYMBOL(devmap_managed_key);
-
-static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
-{
- if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
- pgmap->type == MEMORY_DEVICE_COHERENT ||
- pgmap->type == MEMORY_DEVICE_FS_DAX)
- static_branch_dec(&devmap_managed_key);
-}
-
-static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
-{
- if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
- pgmap->type == MEMORY_DEVICE_COHERENT ||
- pgmap->type == MEMORY_DEVICE_FS_DAX)
- static_branch_inc(&devmap_managed_key);
-}
-#else
-static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
-{
-}
-static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
-{
-}
-#endif /* CONFIG_DEV_PAGEMAP_OPS */
-
static void pgmap_array_delete(struct range *range)
{
xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end),
@@ -104,16 +77,6 @@ static unsigned long pfn_end(struct dev_pagemap *pgmap, int range_id)
return (range->start + range_len(range)) >> PAGE_SHIFT;
}
-static unsigned long pfn_next(unsigned long pfn)
-{
- if (pfn % 1024 == 0)
- cond_resched();
- return pfn + 1;
-}
-
-#define for_each_device_pfn(pfn, map, i) \
- for (pfn = pfn_first(map, i); pfn < pfn_end(map, i); pfn = pfn_next(pfn))
-
static void dev_pagemap_kill(struct dev_pagemap *pgmap)
{
if (pgmap->ops && pgmap->ops->kill)
@@ -166,20 +129,18 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
void memunmap_pages(struct dev_pagemap *pgmap)
{
- unsigned long pfn;
int i;
dev_pagemap_kill(pgmap);
for (i = 0; i < pgmap->nr_range; i++)
- for_each_device_pfn(pfn, pgmap, i)
- put_page(pfn_to_page(pfn));
+ percpu_ref_put_many(pgmap->ref, pfn_end(pgmap, i) -
+ pfn_first(pgmap, i));
dev_pagemap_cleanup(pgmap);
for (i = 0; i < pgmap->nr_range; i++)
pageunmap_range(pgmap, i);
WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n");
- devmap_managed_enable_put(pgmap);
}
EXPORT_SYMBOL_GPL(memunmap_pages);
@@ -382,8 +343,6 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
}
}
- devmap_managed_enable_get(pgmap);
-
/*
* Clear the pgmap nr_range as it will be incremented for each
* successfully processed range. This communicates how many
@@ -498,16 +457,9 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
EXPORT_SYMBOL_GPL(get_dev_pagemap);
#ifdef CONFIG_DEV_PAGEMAP_OPS
-void free_devmap_managed_page(struct page *page)
+static void free_device_page(struct page *page)
{
- /* notify page idle for dax */
- if (!is_device_page(page)) {
- wake_up_var(&page->_refcount);
- return;
- }
-
__ClearPageWaiters(page);
-
mem_cgroup_uncharge(page);
/*
@@ -534,4 +486,20 @@ void free_devmap_managed_page(struct page *page)
page->mapping = NULL;
page->pgmap->ops->page_free(page);
}
+
+void free_zone_device_page(struct page *page)
+{
+ switch (page->pgmap->type) {
+ case MEMORY_DEVICE_PRIVATE:
+ case MEMORY_DEVICE_COHERENT:
+ free_device_page(page);
+ return;
+ case MEMORY_DEVICE_FS_DAX:
+ /* notify page idle */
+ wake_up_var(&page->_refcount);
+ return;
+ default:
+ return;
+ }
+}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
@@ -358,11 +358,6 @@ static int expected_page_refs(struct address_space *mapping, struct page *page)
{
int expected_count = 1;
- /*
- * Device private pages have an extra refcount as they are
- * ZONE_DEVICE pages.
- */
- expected_count += is_device_page(page);
if (mapping)
expected_count += thp_nr_pages(page) + page_has_private(page);
@@ -6580,6 +6580,9 @@ void __ref memmap_init_zone_device(struct zone *zone,
__init_single_page(page, pfn, zone_idx, nid);
+ /* ZONE_DEVICE pages start with a zero reference count. */
+ set_page_count(page, 0);
+
/*
* Mark page reserved as it will need to wait for onlining
* phase for it to be fully associated with a zone.
@@ -114,12 +114,11 @@ static void __put_compound_page(struct page *page)
void __put_page(struct page *page)
{
if (is_zone_device_page(page)) {
- put_dev_pagemap(page->pgmap);
-
/*
* The page belongs to the device that created pgmap. Do
* not return it to page allocator.
*/
+ free_zone_device_page(page);
return;
}
@@ -908,29 +907,18 @@ void release_pages(struct page **pages, int nr)
if (is_huge_zero_page(page))
continue;
+ if (!put_page_testzero(page))
+ continue;
+
if (is_zone_device_page(page)) {
if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
- /*
- * ZONE_DEVICE pages that return 'false' from
- * page_is_devmap_managed() do not require special
- * processing, and instead, expect a call to
- * put_page_testzero().
- */
- if (page_is_devmap_managed(page)) {
- put_devmap_managed_page(page);
- continue;
- }
- if (put_page_testzero(page))
- put_dev_pagemap(page->pgmap);
+ free_zone_device_page(page);
continue;
}
- if (!put_page_testzero(page))
- continue;
-
if (PageCompound(page)) {
if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags);
@@ -1134,26 +1122,3 @@ void __init swap_setup(void)
* _really_ don't want to cluster much more
*/
}
-
-#ifdef CONFIG_DEV_PAGEMAP_OPS
-void put_devmap_managed_page(struct page *page)
-{
- int count;
-
- if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
- return;
-
- count = page_ref_dec_return(page);
-
- /*
- * devmap page refcounts are 1-based, rather than 0-based: if
- * refcount is 1, then the page is free and the refcount is
- * stable because nobody holds a reference on the page.
- */
- if (count == 1)
- free_devmap_managed_page(page);
- else if (!count)
- __put_page(page);
-}
-EXPORT_SYMBOL(put_devmap_managed_page);
-#endif