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authorDan Williams <dan.j.williams@intel.com>2018-06-08 15:16:40 -0700
committerDan Williams <dan.j.williams@intel.com>2018-06-08 15:16:40 -0700
commitb56845794e1e93121acb74ca325db965035d5545 (patch)
tree3435f4e8de92d5a63fdc15953391cf057ee46642 /include/linux
parent808c340be17dc77131fcdf9ad1eb34452d650da1 (diff)
parentcc4a90ac816e00775fbc2a9c018bf2af606abd06 (diff)
Merge branch 'for-4.18/dax' into libnvdimm-for-next
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/dax.h7
-rw-r--r--include/linux/memremap.h36
-rw-r--r--include/linux/mm.h71
3 files changed, 70 insertions, 44 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index f9eb22ad341e..25bab6abb695 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -83,6 +83,8 @@ static inline void fs_put_dax(struct dax_device *dax_dev)
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc);
+
+struct page *dax_layout_busy_page(struct address_space *mapping);
#else
static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
@@ -103,6 +105,11 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
return NULL;
}
+static inline struct page *dax_layout_busy_page(struct address_space *mapping)
+{
+ return NULL;
+}
+
static inline int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc)
{
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 7b4899c06f49..5ebfff65da4d 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -1,7 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MEMREMAP_H_
#define _LINUX_MEMREMAP_H_
-#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/percpu-refcount.h>
@@ -30,13 +29,6 @@ struct vmem_altmap {
* Specialize ZONE_DEVICE memory into multiple types each having differents
* usage.
*
- * MEMORY_DEVICE_HOST:
- * Persistent device memory (pmem): struct page might be allocated in different
- * memory and architecture might want to perform special actions. It is similar
- * to regular memory, in that the CPU can access it transparently. However,
- * it is likely to have different bandwidth and latency than regular memory.
- * See Documentation/nvdimm/nvdimm.txt for more information.
- *
* MEMORY_DEVICE_PRIVATE:
* Device memory that is not directly addressable by the CPU: CPU can neither
* read nor write private memory. In this case, we do still have struct pages
@@ -53,11 +45,19 @@ struct vmem_altmap {
* driver can hotplug the device memory using ZONE_DEVICE and with that memory
* type. Any page of a process can be migrated to such memory. However no one
* should be allow to pin such memory so that it can always be evicted.
+ *
+ * MEMORY_DEVICE_FS_DAX:
+ * Host memory that has similar access semantics as System RAM i.e. DMA
+ * coherent and supports page pinning. In support of coordinating page
+ * pinning vs other operations MEMORY_DEVICE_FS_DAX arranges for a
+ * wakeup event whenever a page is unpinned and becomes idle. This
+ * wakeup is used to coordinate physical address space management (ex:
+ * fs truncate/hole punch) vs pinned pages (ex: device dma).
*/
enum memory_type {
- MEMORY_DEVICE_HOST = 0,
- MEMORY_DEVICE_PRIVATE,
+ MEMORY_DEVICE_PRIVATE = 1,
MEMORY_DEVICE_PUBLIC,
+ MEMORY_DEVICE_FS_DAX,
};
/*
@@ -129,8 +129,6 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
unsigned long vmem_altmap_offset(struct vmem_altmap *altmap);
void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
-
-static inline bool is_zone_device_page(const struct page *page);
#else
static inline void *devm_memremap_pages(struct device *dev,
struct dev_pagemap *pgmap)
@@ -161,20 +159,6 @@ static inline void vmem_altmap_free(struct vmem_altmap *altmap,
}
#endif /* CONFIG_ZONE_DEVICE */
-#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
-static inline bool is_device_private_page(const struct page *page)
-{
- return is_zone_device_page(page) &&
- page->pgmap->type == MEMORY_DEVICE_PRIVATE;
-}
-
-static inline bool is_device_public_page(const struct page *page)
-{
- return is_zone_device_page(page) &&
- page->pgmap->type == MEMORY_DEVICE_PUBLIC;
-}
-#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-
static inline void put_dev_pagemap(struct dev_pagemap *pgmap)
{
if (pgmap)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 02a616e2f17d..274d5242bd0d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -821,27 +821,65 @@ static inline bool is_zone_device_page(const struct page *page)
}
#endif
-#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
-void put_zone_device_private_or_public_page(struct page *page);
-DECLARE_STATIC_KEY_FALSE(device_private_key);
-#define IS_HMM_ENABLED static_branch_unlikely(&device_private_key)
-static inline bool is_device_private_page(const struct page *page);
-static inline bool is_device_public_page(const struct page *page);
-#else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-static inline void put_zone_device_private_or_public_page(struct page *page)
+#ifdef CONFIG_DEV_PAGEMAP_OPS
+void dev_pagemap_get_ops(void);
+void dev_pagemap_put_ops(void);
+void __put_devmap_managed_page(struct page *page);
+DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
+static inline bool put_devmap_managed_page(struct page *page)
+{
+ if (!static_branch_unlikely(&devmap_managed_key))
+ return false;
+ if (!is_zone_device_page(page))
+ return false;
+ switch (page->pgmap->type) {
+ case MEMORY_DEVICE_PRIVATE:
+ case MEMORY_DEVICE_PUBLIC:
+ case MEMORY_DEVICE_FS_DAX:
+ __put_devmap_managed_page(page);
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+
+static inline bool is_device_private_page(const struct page *page)
{
+ return is_zone_device_page(page) &&
+ page->pgmap->type == MEMORY_DEVICE_PRIVATE;
}
-#define IS_HMM_ENABLED 0
+
+static inline bool is_device_public_page(const struct page *page)
+{
+ return is_zone_device_page(page) &&
+ page->pgmap->type == MEMORY_DEVICE_PUBLIC;
+}
+
+#else /* CONFIG_DEV_PAGEMAP_OPS */
+static inline void dev_pagemap_get_ops(void)
+{
+}
+
+static inline void dev_pagemap_put_ops(void)
+{
+}
+
+static inline bool put_devmap_managed_page(struct page *page)
+{
+ return false;
+}
+
static inline bool is_device_private_page(const struct page *page)
{
return false;
}
+
static inline bool is_device_public_page(const struct page *page)
{
return false;
}
-#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-
+#endif /* CONFIG_DEV_PAGEMAP_OPS */
static inline void get_page(struct page *page)
{
@@ -859,16 +897,13 @@ static inline void put_page(struct page *page)
page = compound_head(page);
/*
- * For private device pages we need to catch refcount transition from
- * 2 to 1, when refcount reach one it means the private device page is
- * free and we need to inform the device driver through callback. See
+ * 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 (IS_HMM_ENABLED && unlikely(is_device_private_page(page) ||
- unlikely(is_device_public_page(page)))) {
- put_zone_device_private_or_public_page(page);
+ if (put_devmap_managed_page(page))
return;
- }
if (put_page_testzero(page))
__put_page(page);