linux/drivers/nvdimm
Dan Williams 9476df7d80 mm: introduce find_dev_pagemap()
There are several scenarios where we need to retrieve and update
metadata associated with a given devm_memremap_pages() mapping, and the
only lookup key available is a pfn in the range:

1/ We want to augment vmemmap_populate() (called via arch_add_memory())
   to allocate memmap storage from pre-allocated pages reserved by the
   device driver.  At vmemmap_alloc_block_buf() time it grabs device pages
   rather than page allocator pages.  This is in support of
   devm_memremap_pages() mappings where the memmap is too large to fit in
   main memory (i.e. large persistent memory devices).

2/ Taking a reference against the mapping when inserting device pages
   into the address_space radix of a given inode.  This facilitates
   unmap_mapping_range() and truncate_inode_pages() operations when the
   driver is tearing down the mapping.

3/ get_user_pages() operations on ZONE_DEVICE memory require taking a
   reference against the mapping so that the driver teardown path can
   revoke and drain usage of device pages.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-15 17:56:32 -08:00
..
blk.c block: change ->make_request_fn() and users to return a queue cookie 2015-11-07 10:40:46 -07:00
btt_devs.c libnvdimm: btt_devs: Fix locking in namespace_store 2015-09-17 11:37:16 -04:00
btt.c block: change ->make_request_fn() and users to return a queue cookie 2015-11-07 10:40:46 -07:00
btt.h libnvdimm, btt: consolidate arena validation 2015-08-14 13:43:04 -04:00
bus.c nvdimm: Fix return value of nvdimm_bus_init() if class_create() fails 2015-06-30 14:30:34 -04:00
claim.c libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
core.c libnvdimm: convert to statically allocated badblocks 2016-01-09 08:39:04 -08:00
dimm_devs.c nvdimm: change to use generic kvfree() 2015-08-27 19:35:48 -04:00
dimm.c libnvdimm: pmem label sets and namespace instantiation. 2015-06-24 21:24:10 -04:00
e820.c libnvdimm, e820: fix numa node for e820-type-12 pmem ranges 2015-11-12 09:21:18 -08:00
Kconfig libnvdimm, pmem: 'struct page' for pmem 2015-08-28 23:40:04 -04:00
label.c libnvdimm: infrastructure for btt devices 2015-06-25 04:20:04 -04:00
label.h libnvdimm: write blk label set 2015-06-24 21:24:10 -04:00
Makefile libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
namespace_devs.c libnvdimm: fix namespace object confusion in is_uuid_busy() 2016-01-05 18:37:23 -08:00
nd-core.h Merge branch 'for-4.5/block-dax' into for-4.5/libnvdimm 2016-01-10 07:53:55 -08:00
nd.h Merge branch 'for-4.5/block-dax' into for-4.5/libnvdimm 2016-01-10 07:53:55 -08:00
pfn_devs.c libnvdimm, pfn: add parent uuid validation 2015-12-13 11:40:20 -08:00
pfn.h libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
pmem.c mm: introduce find_dev_pagemap() 2016-01-15 17:56:32 -08:00
region_devs.c libnvdimm: fix namespace object confusion in is_uuid_busy() 2016-01-05 18:37:23 -08:00
region.c libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00