linux-toradex.git/lib/genalloc.c, branch v5.10-rc1

lib/genalloc.c: rename addr_in_gen_pool to gen_pool_has_addr

2019-12-05T03:44:13+00:00

Follow the kernel conventions, rename addr_in_gen_pool to
gen_pool_has_addr.

[sjhuang@iluvatar.ai: fix Documentation/ too]
 Link: http://lkml.kernel.org/r/20181229015914.5573-1-sjhuang@iluvatar.ai
Link: http://lkml.kernel.org/r/20181228083950.20398-1-sjhuang@iluvatar.ai
Signed-off-by: Huang Shijie 
Reviewed-by: Andrew Morton 
Cc: Russell King 
Cc: Arnd Bergmann 
Cc: Greg Kroah-Hartman 
Cc: Christoph Hellwig 
Cc: Marek Szyprowski 
Cc: Robin Murphy 
Cc: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib/genalloc.c: export symbol addr_in_gen_pool

2019-12-05T03:44:13+00:00

We use addr_in_gen_pool() in a driver module.  So export it.

Link: http://lkml.kernel.org/r/20181224070622.22197-2-sjhuang@iluvatar.ai
Signed-off-by: Huang Shijie 
Reviewed-by: Andrew Morton 
Cc: Alexey Skidanov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

genalloc: Fix a set of docs build warnings

2019-10-07T15:10:38+00:00

Commit 795ee30648c7 ("lib/genalloc: introduce chunk owners") made a number
of changes to the genalloc API and implementation but did not update the
documentation to match, leading to these docs build warnings:

  ./lib/genalloc.c:1: warning: 'gen_pool_add_virt' not found
  ./lib/genalloc.c:1: warning: 'gen_pool_alloc' not found
  ./lib/genalloc.c:1: warning: 'gen_pool_free' not found
  ./lib/genalloc.c:1: warning: 'gen_pool_alloc_algo' not found

Fix these by updating the docs to match new function locations and names,
and by completing the update of one kerneldoc comment.

Fixes: 795ee30648c7 ("lib/genalloc: introduce chunk owners")
Acked-by: Dan Williams 
Signed-off-by: Jonathan Corbet

Merge tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping

2019-07-12T22:13:55+00:00

Pull dma-mapping updates from Christoph Hellwig:

 - move the USB special case that bounced DMA through a device bar into
   the USB code instead of handling it in the common DMA code (Laurentiu
   Tudor and Fredrik Noring)

 - don't dip into the global CMA pool for single page allocations
   (Nicolin Chen)

 - fix a crash when allocating memory for the atomic pool failed during
   boot (Florian Fainelli)

 - move support for MIPS-style uncached segments to the common code and
   use that for MIPS and nios2 (me)

 - make support for DMA_ATTR_NON_CONSISTENT and
   DMA_ATTR_NO_KERNEL_MAPPING generic (me)

 - convert nds32 to the generic remapping allocator (me)

* tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping: (29 commits)
  dma-mapping: mark dma_alloc_need_uncached as __always_inline
  MIPS: only select ARCH_HAS_UNCACHED_SEGMENT for non-coherent platforms
  usb: host: Fix excessive alignment restriction for local memory allocations
  lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators
  nios2: use the generic uncached segment support in dma-direct
  nds32: use the generic remapping allocator for coherent DMA allocations
  arc: use the generic remapping allocator for coherent DMA allocations
  dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code
  dma-direct: handle DMA_ATTR_NON_CONSISTENT in common code
  dma-mapping: add a dma_alloc_need_uncached helper
  openrisc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arm-nommu: remove the partial DMA_ATTR_NON_CONSISTENT support
  ARM: dma-mapping: allow larger DMA mask than supported
  dma-mapping: truncate dma masks to what dma_addr_t can hold
  iommu/dma: Apply dma_{alloc,free}_contiguous functions
  dma-remap: Avoid de-referencing NULL atomic_pool
  MIPS: use the generic uncached segment support in dma-direct
  dma-direct: provide generic support for uncached kernel segments
  au1100fb: fix DMA API abuse
  ...

lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators

2019-06-28T05:56:50+00:00

Provide the algorithm option to DMA allocators as well, along with
convenience variants for zeroed and aligned memory. The following
four functions are added:

- gen_pool_dma_alloc_algo()
- gen_pool_dma_alloc_align()
- gen_pool_dma_zalloc_algo()
- gen_pool_dma_zalloc_align()

Signed-off-by: Fredrik Noring 
Tested-by: Guenter Roeck 
Signed-off-by: Christoph Hellwig

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230

2019-06-19T15:09:06+00:00

Based on 2 normalized pattern(s):

  this source code is licensed under the gnu general public license
  version 2 see the file copying for more details

  this source code is licensed under general public license version 2
  see

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 52 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Allison Randal 
Reviewed-by: Alexios Zavras 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de
Signed-off-by: Greg Kroah-Hartman

lib/genalloc: introduce chunk owners

2019-06-14T03:34:56+00:00

The p2pdma facility enables a provider to publish a pool of dma
addresses for a consumer to allocate.  A genpool is used internally by
p2pdma to collect dma resources, 'chunks', to be handed out to
consumers.  Whenever a consumer allocates a resource it needs to pin the
'struct dev_pagemap' instance that backs the chunk selected by
pci_alloc_p2pmem().

Currently that reference is taken globally on the entire provider
device.  That sets up a lifetime mismatch whereby the p2pdma core needs
to maintain hacks to make sure the percpu_ref is not released twice.

This lifetime mismatch also stands in the way of a fix to
devm_memremap_pages() whereby devm_memremap_pages_release() must wait for
the percpu_ref ->release() callback to complete before it can proceed to
teardown pages.

So, towards fixing this situation, introduce the ability to store a 'chunk
owner' at gen_pool_add() time, and a facility to retrieve the owner at
gen_pool_{alloc,free}() time.  For p2pdma this will be used to store and
recall individual dev_pagemap reference counter instances per-chunk.

Link: http://lkml.kernel.org/r/155727338118.292046.13407378933221579644.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams 
Reviewed-by: Ira Weiny 
Reviewed-by: Logan Gunthorpe 
Cc: Bjorn Helgaas 
Cc: "Jérôme Glisse" 
Cc: Christoph Hellwig 
Cc: Greg Kroah-Hartman 
Cc: "Rafael J. Wysocki" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib/genalloc: add gen_pool_dma_zalloc() for zeroed DMA allocations

2019-06-03T14:00:07+00:00

gen_pool_dma_zalloc() is a zeroed memory variant of
gen_pool_dma_alloc().  Also document the return values of both, and
indicate NULL as a "%NULL" constant.

Signed-off-by: Fredrik Noring 
Reviewed-by: Greg Kroah-Hartman 
Signed-off-by: Christoph Hellwig

lib/genalloc.c: include vmalloc.h

2019-01-05T21:54:53+00:00

Fixes build break on most ARM/ARM64 defconfigs:

  lib/genalloc.c: In function 'gen_pool_add_virt':
  lib/genalloc.c:190:10: error: implicit declaration of function 'vzalloc_node'; did you mean 'kzalloc_node'?
  lib/genalloc.c:190:8: warning: assignment to 'struct gen_pool_chunk *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  lib/genalloc.c: In function 'gen_pool_destroy':
  lib/genalloc.c:254:3: error: implicit declaration of function 'vfree'; did you mean 'kfree'?

Fixes: 6862d2fc8185 ('lib/genalloc.c: use vzalloc_node() to allocate the bitmap')
Cc: Huang Shijie 
Cc: Andrew Morton 
Cc: Alexey Skidanov 
Signed-off-by: Olof Johansson 
Signed-off-by: Linus Torvalds

lib/genalloc.c: use vzalloc_node() to allocate the bitmap

2019-01-04T21:13:46+00:00

Some devices may have big memory on chip, such as over 1G.  In some
cases, the nbytes maybe bigger then 4M which is the bounday of the
memory buddy system (4K default).

So use vzalloc_node() to allocate the bitmap.  Also use vfree to free
it.

Link: http://lkml.kernel.org/r/20181225015701.6289-1-sjhuang@iluvatar.ai
Signed-off-by: Huang Shijie 
Reviewed-by: Andrew Morton 
Cc: Alexey Skidanov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds