linux/drivers/nvdimm
Dan Williams 5c2c2587b1 mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup
get_dev_page() enables paths like get_user_pages() to pin a dynamically
mapped pfn-range (devm_memremap_pages()) while the resulting struct page
objects are in use.  Unlike get_page() it may fail if the device is, or
is in the process of being, disabled.  While the initial lookup of the
range may be an expensive list walk, the result is cached to speed up
subsequent lookups which are likely to be in the same mapped range.

devm_memremap_pages() now requires a reference counter to be specified
at init time.  For pmem this means moving request_queue allocation into
pmem_alloc() so the existing queue usage counter can track "device
pages".

ZONE_DEVICE pages always have an elevated count and will never be on an
lru reclaim list.  That space in 'struct page' can be redirected for
other uses, but for safety introduce a poison value that will always
trip __list_add() to assert.  This allows half of the struct list_head
storage to be reclaimed with some assurance to back up the assumption
that the page count never goes to zero and a list_add() is never
attempted.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
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
..
Kconfig libnvdimm, pmem: 'struct page' for pmem 2015-08-28 23:40:04 -04:00
Makefile libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
blk.c block: change ->make_request_fn() and users to return a queue cookie 2015-11-07 10:40:46 -07:00
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
btt_devs.c libnvdimm: btt_devs: Fix locking in namespace_store 2015-09-17 11:37:16 -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.c libnvdimm: pmem label sets and namespace instantiation. 2015-06-24 21:24:10 -04:00
dimm_devs.c nvdimm: change to use generic kvfree() 2015-08-27 19:35:48 -04:00
e820.c libnvdimm, e820: fix numa node for e820-type-12 pmem ranges 2015-11-12 09:21:18 -08:00
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
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.h libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
pfn_devs.c libnvdimm, pfn, pmem: allocate memmap array in persistent memory 2016-01-15 17:56:32 -08:00
pmem.c mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup 2016-01-15 17:56:32 -08:00
region.c libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
region_devs.c libnvdimm: fix namespace object confusion in is_uuid_busy() 2016-01-05 18:37:23 -08:00