linux-toradex.git/drivers/dax/bus.h, branch v5.19-rc3

Merge branch 'akpm' (patches from Andrew)

2022-01-15T18:37:06+00:00

Merge misc updates from Andrew Morton:
 "146 patches.

  Subsystems affected by this patch series: kthread, ia64, scripts,
  ntfs, squashfs, ocfs2, vfs, and mm (slab-generic, slab, kmemleak,
  dax, kasan, debug, pagecache, gup, shmem, frontswap, memremap,
  memcg, selftests, pagemap, dma, vmalloc, memory-failure, hugetlb,
  userfaultfd, vmscan, mempolicy, oom-kill, hugetlbfs, migration, thp,
  ksm, page-poison, percpu, rmap, zswap, zram, cleanups, hmm, and
  damon)"

* emailed patches from Andrew Morton : (146 commits)
  mm/damon: hide kernel pointer from tracepoint event
  mm/damon/vaddr: hide kernel pointer from damon_va_three_regions() failure log
  mm/damon/vaddr: use pr_debug() for damon_va_three_regions() failure logging
  mm/damon/dbgfs: remove an unnecessary variable
  mm/damon: move the implementation of damon_insert_region to damon.h
  mm/damon: add access checking for hugetlb pages
  Docs/admin-guide/mm/damon/usage: update for schemes statistics
  mm/damon/dbgfs: support all DAMOS stats
  Docs/admin-guide/mm/damon/reclaim: document statistics parameters
  mm/damon/reclaim: provide reclamation statistics
  mm/damon/schemes: account how many times quota limit has exceeded
  mm/damon/schemes: account scheme actions that successfully applied
  mm/damon: remove a mistakenly added comment for a future feature
  Docs/admin-guide/mm/damon/usage: update for kdamond_pid and (mk|rm)_contexts
  Docs/admin-guide/mm/damon/usage: mention tracepoint at the beginning
  Docs/admin-guide/mm/damon/usage: remove redundant information
  Docs/admin-guide/mm/damon/usage: update for scheme quotas and watermarks
  mm/damon: convert macro functions to static inline functions
  mm/damon: modify damon_rand() macro to static inline function
  mm/damon: move damon_rand() definition into damon.h
  ...

device-dax: ensure dev_dax->pgmap is valid for dynamic devices

2022-01-15T14:30:25+00:00

Right now, only static dax regions have a valid @pgmap pointer in its
struct dev_dax.  Dynamic dax case however, do not.

In preparation for device-dax compound devmap support, make sure that
dev_dax pgmap field is set after it has been allocated and initialized.

dynamic dax device have the @pgmap is allocated at probe() and it's
managed by devm (contrast to static dax region which a pgmap is provided
and dax core kfrees it).  So in addition to ensure a valid @pgmap, clear
the pgmap when the dynamic dax device is released to avoid the same
pgmap ranges to be re-requested across multiple region device reconfigs.

Add a static_dev_dax() and use that helper in dev_dax_probe() to ensure
the initialization differences between dynamic and static regions are
more explicit.  While at it, consolidate the ranges initialization when
we allocate the @pgmap for the dynamic dax region case.  Also take the
opportunity to document the differences between static and dynamic da
regions.

Link: https://lkml.kernel.org/r/20211202204422.26777-8-joao.m.martins@oracle.com
Suggested-by: Dan Williams 
Signed-off-by: Joao Martins 
Cc: Christoph Hellwig 
Cc: Dave Jiang 
Cc: Jane Chu 
Cc: Jason Gunthorpe 
Cc: Jason Gunthorpe 
Cc: John Hubbard 
Cc: Jonathan Corbet 
Cc: Matthew Wilcox (Oracle) 
Cc: Mike Kravetz 
Cc: Muchun Song 
Cc: Naoya Horiguchi 
Cc: Vishal Verma 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dax: Kill DEV_DAX_PMEM_COMPAT

2021-11-25T03:21:35+00:00

The /sys/class/dax compatibility option has shipped in the kernel for 4
years now which should be sufficient time for tools to abandon the old
ABI in favor of the /sys/bus/dax device-model. Delete it now and see if
anyone screams.

Since this compatibility option shipped there has been more reports of
users being surprised by the compat ABI than surprised by the "new", so
the compat infrastructure has outlived its usefulness. Recall that
/sys/bus/dax device-model is required for the dax kmem driver which
allows PMEM to be used as "System RAM".

The following projects were known to have a dependency on /sys/class/dax
and have dropped their dependency as of the listed version:

- ndctl (including libndctl, daxctl, and libdaxctl): v64+
- fio: v3.13+
- pmdk: v1.5.2+

As further evidence this option is no longer needed some distributions
have already stopped enabling CONFIG_DEV_DAX_PMEM_COMPAT.

Cc: Ira Weiny 
Cc: Dave Jiang 
Reported-by: Vishal Verma 
Acked-by: Dave Hansen 
Reviewed-by: Jane Chu 
Link: https://lore.kernel.org/r/163701116195.3784476.726128179293466337.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams

dax-device: Make remove callback return void

2021-02-17T03:45:13+00:00

The driver core ignores the return value of struct bus_type::remove()
because there is only little that can be done. To simplify the quest to
make this function return void, let struct dax_device_driver::remove()
return void, too. All users already unconditionally return 0, this commit
makes it obvious that returning an error code isn't intended.

Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/20210205222842.34896-6-uwe@kleine-koenig.org
Signed-off-by: Dan Williams

mm/memremap_pages: convert to 'struct range'

2020-10-14T01:38:28+00:00

The 'struct resource' in 'struct dev_pagemap' is only used for holding
resource span information.  The other fields, 'name', 'flags', 'desc',
'parent', 'sibling', and 'child' are all unused wasted space.

This is in preparation for introducing a multi-range extension of
devm_memremap_pages().

The bulk of this change is unwinding all the places internal to libnvdimm
that used 'struct resource' unnecessarily, and replacing instances of
'struct dev_pagemap'.res with 'struct dev_pagemap'.range.

P2PDMA had a minor usage of the resource flags field, but only to report
failures with "%pR".  That is replaced with an open coded print of the
range.

[dan.carpenter@oracle.com: mm/hmm/test: use after free in dmirror_allocate_chunk()]
  Link: https://lkml.kernel.org/r/20200926121402.GA7467@kadam

Signed-off-by: Dan Williams 
Signed-off-by: Dan Carpenter 
Signed-off-by: Andrew Morton 
Reviewed-by: Boris Ostrovsky 	[xen]
Cc: Paul Mackerras 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Vishal Verma 
Cc: Vivek Goyal 
Cc: Dave Jiang 
Cc: Ben Skeggs 
Cc: David Airlie 
Cc: Daniel Vetter 
Cc: Ira Weiny 
Cc: Bjorn Helgaas 
Cc: Juergen Gross 
Cc: Stefano Stabellini 
Cc: "Jérôme Glisse" 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Ard Biesheuvel 
Cc: Borislav Petkov 
Cc: Brice Goglin 
Cc: Catalin Marinas 
Cc: Dave Hansen 
Cc: David Hildenbrand 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Hulk Robot 
Cc: Ingo Molnar 
Cc: Jason Gunthorpe 
Cc: Jason Yan 
Cc: Jeff Moyer 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: kernel test robot 
Cc: Mike Rapoport 
Cc: Pavel Tatashin 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Randy Dunlap 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Wei Yang 
Cc: Will Deacon 
Link: https://lkml.kernel.org/r/159643103173.4062302.768998885691711532.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106115761.30709.13539840236873663620.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds

device-dax: introduce 'struct dev_dax' typed-driver operations

2020-10-14T01:38:28+00:00

In preparation for introducing seed devices the dax-bus core needs to be
able to intercept ->probe() and ->remove() operations.  Towards that end
arrange for the bus and drivers to switch from raw 'struct device' driver
operations to 'struct dev_dax' typed operations.

Reported-by: Hulk Robot 
Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Cc: Jason Yan 
Cc: Vishal Verma 
Cc: Brice Goglin 
Cc: Dave Hansen 
Cc: Dave Jiang 
Cc: David Hildenbrand 
Cc: Ira Weiny 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Ard Biesheuvel 
Cc: Benjamin Herrenschmidt 
Cc: Ben Skeggs 
Cc: Bjorn Helgaas 
Cc: Borislav Petkov 
Cc: Boris Ostrovsky 
Cc: Catalin Marinas 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Jason Gunthorpe 
Cc: Jeff Moyer 
Cc: "Jérôme Glisse" 
Cc: Juergen Gross 
Cc: kernel test robot 
Cc: Michael Ellerman 
Cc: Mike Rapoport 
Cc: Paul Mackerras 
Cc: Pavel Tatashin 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Randy Dunlap 
Cc: Stefano Stabellini 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Vivek Goyal 
Cc: Wei Yang 
Cc: Will Deacon 
Link: https://lkml.kernel.org/r/160106113357.30709.4541750544799737855.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds

device-dax: add an allocation interface for device-dax instances

2020-10-14T01:38:28+00:00

In preparation for a facility that enables dax regions to be sub-divided,
introduce infrastructure to track and allocate region capacity.

The new dax_region/available_size attribute is only enabled for volatile
hmem devices, not pmem devices that are defined by nvdimm namespace
boundaries.  This is per Jeff's feedback the last time dynamic device-dax
capacity allocation support was discussed.

Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Cc: Vishal Verma 
Cc: Brice Goglin 
Cc: Dave Hansen 
Cc: Dave Jiang 
Cc: David Hildenbrand 
Cc: Ira Weiny 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Ard Biesheuvel 
Cc: Benjamin Herrenschmidt 
Cc: Ben Skeggs 
Cc: Bjorn Helgaas 
Cc: Borislav Petkov 
Cc: Boris Ostrovsky 
Cc: Catalin Marinas 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Hulk Robot 
Cc: Ingo Molnar 
Cc: Jason Gunthorpe 
Cc: Jason Yan 
Cc: Jeff Moyer 
Cc: "Jérôme Glisse" 
Cc: Juergen Gross 
Cc: kernel test robot 
Cc: Michael Ellerman 
Cc: Mike Rapoport 
Cc: Paul Mackerras 
Cc: Pavel Tatashin 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Randy Dunlap 
Cc: Stefano Stabellini 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Vivek Goyal 
Cc: Wei Yang 
Cc: Will Deacon 
Link: https://lore.kernel.org/linux-nvdimm/x49shpp3zn8.fsf@segfault.boston.devel.redhat.com
Link: https://lkml.kernel.org/r/159643101035.4062302.6785857915652647857.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106112801.30709.14601438735305335071.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds

device-dax: make pgmap optional for instance creation

2020-10-14T01:38:28+00:00

The passed in dev_pagemap is only required in the pmem case as the
libnvdimm core may have reserved a vmem_altmap for dev_memremap_pages() to
place the memmap in pmem directly.  In the hmem case there is no agent
reserving an altmap so it can all be handled by a core internal default.

Pass the resource range via a new @range property of 'struct
dev_dax_data'.

Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Cc: David Hildenbrand 
Cc: Vishal Verma 
Cc: Dave Hansen 
Cc: Pavel Tatashin 
Cc: Brice Goglin 
Cc: Dave Jiang 
Cc: Ira Weiny 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Ard Biesheuvel 
Cc: Benjamin Herrenschmidt 
Cc: Ben Skeggs 
Cc: Bjorn Helgaas 
Cc: Borislav Petkov 
Cc: Boris Ostrovsky 
Cc: Catalin Marinas 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Hulk Robot 
Cc: Ingo Molnar 
Cc: Jason Gunthorpe 
Cc: Jason Yan 
Cc: Jeff Moyer 
Cc: "Jérôme Glisse" 
Cc: Juergen Gross 
Cc: kernel test robot 
Cc: Michael Ellerman 
Cc: Mike Rapoport 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Randy Dunlap 
Cc: Stefano Stabellini 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Vivek Goyal 
Cc: Wei Yang 
Cc: Will Deacon 
Link: https://lkml.kernel.org/r/159643099958.4062302.10379230791041872886.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106110513.30709.4303239334850606031.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds

device-dax: move instance creation parameters to 'struct dev_dax_data'

2020-10-14T01:38:28+00:00

In preparation for adding more parameters to instance creation, move
existing parameters to a new struct.

Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Cc: Vishal Verma 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Benjamin Herrenschmidt 
Cc: Ben Skeggs 
Cc: Borislav Petkov 
Cc: Brice Goglin 
Cc: Catalin Marinas 
Cc: Daniel Vetter 
Cc: Dave Hansen 
Cc: Dave Jiang 
Cc: David Airlie 
Cc: David Hildenbrand 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Ira Weiny 
Cc: Jason Gunthorpe 
Cc: Jeff Moyer 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: Michael Ellerman 
Cc: Mike Rapoport 
Cc: Paul Mackerras 
Cc: Pavel Tatashin 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Wei Yang 
Cc: Will Deacon 
Cc: Ard Biesheuvel 
Cc: Bjorn Helgaas 
Cc: Boris Ostrovsky 
Cc: Hulk Robot 
Cc: Jason Yan 
Cc: "Jérôme Glisse" 
Cc: Juergen Gross 
Cc: kernel test robot 
Cc: Randy Dunlap 
Cc: Stefano Stabellini 
Cc: Vivek Goyal 
Link: https://lkml.kernel.org/r/159643099411.4062302.1337305960720423895.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds

device-dax: drop the dax_region.pfn_flags attribute

2020-10-14T01:38:28+00:00

All callers specify the same flags to alloc_dax_region(), so there is no
need to allow for anything other than PFN_DEV|PFN_MAP, or carry a
->pfn_flags around on the region.  Device-dax instances are always page
backed.

Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Cc: Vishal Verma 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Benjamin Herrenschmidt 
Cc: Ben Skeggs 
Cc: Borislav Petkov 
Cc: Brice Goglin 
Cc: Catalin Marinas 
Cc: Daniel Vetter 
Cc: Dave Hansen 
Cc: Dave Jiang 
Cc: David Airlie 
Cc: David Hildenbrand 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Ira Weiny 
Cc: Jason Gunthorpe 
Cc: Jeff Moyer 
Cc: Jia He 
Cc: Joao Martins 
Cc: Jonathan Cameron 
Cc: Michael Ellerman 
Cc: Mike Rapoport 
Cc: Paul Mackerras 
Cc: Pavel Tatashin 
Cc: Peter Zijlstra 
Cc: "Rafael J. Wysocki" 
Cc: Thomas Gleixner 
Cc: Tom Lendacky 
Cc: Wei Yang 
Cc: Will Deacon 
Cc: Ard Biesheuvel 
Cc: Bjorn Helgaas 
Cc: Boris Ostrovsky 
Cc: Hulk Robot 
Cc: Jason Yan 
Cc: "Jérôme Glisse" 
Cc: Juergen Gross 
Cc: kernel test robot 
Cc: Randy Dunlap 
Cc: Stefano Stabellini 
Cc: Vivek Goyal 
Link: https://lkml.kernel.org/r/159643098829.4062302.13611520567669439046.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds