06 Oct, 2020
1 commit
-
Extend __sg_alloc_table_from_pages to support dynamic allocation of
SG table from pages. It should be used by drivers that can't supply
all the pages at one time.This function returns the last populated SGE in the table. Users should
pass it as an argument to the function from the second call and forward.
As before, nents will be equal to the number of populated SGEs (chunks).With this new extension, drivers can benefit the optimization of merging
contiguous pages without a need to allocate all pages in advance and
hold them in a large buffer.E.g. with the Infiniband driver that allocates a single page for hold the
pages. For 1TB memory registration, the temporary buffer would consume only
4KB, instead of 2GB.Link: https://lore.kernel.org/r/20201004154340.1080481-2-leon@kernel.org
Signed-off-by: Maor Gottlieb
Reviewed-by: Christoph Hellwig
Signed-off-by: Leon Romanovsky
Signed-off-by: Jason Gunthorpe
06 Jul, 2020
1 commit
-
Add brackets to protect parameters of the recently added sg_table related
macros from side-effects.Fixes: 709d6d73c756 ("scatterlist: add generic wrappers for iterating over sgtable objects")
Signed-off-by: Marek Szyprowski
Signed-off-by: Christoph Hellwig
13 May, 2020
1 commit
-
struct sg_table is a common structure used for describing a memory
buffer. It consists of a scatterlist with memory pages and DMA addresses
(sgl entry), as well as the number of scatterlist entries: CPU pages
(orig_nents entry) and DMA mapped pages (nents entry).It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling the scatterlist iterating functions with a wrong number
of the entries.To avoid such issues, lets introduce a common wrappers operating directly
on the struct sg_table objects, which take care of the proper use of
the nents and orig_nents entries.While touching this, lets clarify some ambiguities in the comments for
the existing for_each helpers.Signed-off-by: Marek Szyprowski
Reviewed-by: Robin Murphy
Signed-off-by: Christoph Hellwig
21 Jun, 2019
1 commit
-
sg_alloc_table_chained() currently allows the caller to provide one
preallocated SGL and returns if the requested number isn't bigger than
size of that SGL. This is used to inline an SGL for an IO request.However, scattergather code only allows that size of the 1st preallocated
SGL to be SG_CHUNK_SIZE(128). This means a substantial amount of memory
(4KB) is claimed for the SGL for each IO request. If the I/O is small, it
would be prudent to allocate a smaller SGL.Introduce an extra parameter to sg_alloc_table_chained() and
sg_free_table_chained() for specifying size of the preallocated SGL.Both __sg_free_table() and __sg_alloc_table() assume that each SGL has the
same size except for the last one. Change the code to allow both functions
to accept a variable size for the 1st preallocated SGL.[mkp: attempted to clarify commit desc]
Cc: Christoph Hellwig
Cc: Bart Van Assche
Cc: Ewan D. Milne
Cc: Hannes Reinecke
Cc: Sagi Grimberg
Cc: Chuck Lever
Cc: netdev@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Suggested-by: Christoph Hellwig
Signed-off-by: Ming Lei
Reviewed-by: Christoph Hellwig
Signed-off-by: Martin K. Petersen
07 May, 2019
1 commit
-
Commit d901b2760dc6 ("lib/scatterlist: Provide a DMA page iterator") added
the sg DMA iterator but a leftover remained in the sg_page_iter
documentation as you cannot get the page dma address (only the page
itself), fix it.Signed-off-by: Gal Pressman
Reviewed-by: Mukesh Ojha
Signed-off-by: Jason Gunthorpe
12 Feb, 2019
1 commit
-
Commit 2db76d7c3c6d ("lib/scatterlist: sg_page_iter: support sg lists w/o
backing pages") introduced the sg_page_iter_dma_address() function without
providing a way to use it in the general case. If the sg_dma_len() is not
equal to the sg length callers cannot safely use the
for_each_sg_page/sg_page_iter_dma_address combination.Resolve this API mistake by providing a DMA specific iterator,
for_each_sg_dma_page(), that uses the right length so
sg_page_iter_dma_address() works as expected with all sglists.A new iterator type is introduced to provide compile-time safety against
wrongly mixing accessors and iterators.Acked-by: Christoph Hellwig (for scatterlist)
Acked-by: Thomas Hellstrom
Acked-by: Sakari Ailus (ipu3-cio2)
Signed-off-by: Jason Gunthorpe
06 Dec, 2018
1 commit
-
These days architectures are mostly out of the business of dealing with
struct scatterlist at all, unless they have architecture specific iommu
drivers. Replace the ARCH_HAS_SG_CHAIN symbol with a ARCH_NO_SG_CHAIN
one only enabled for architectures with horrible legacy iommu drivers
like alpha and parisc, and conditionally for arm which wants to keep it
disable for legacy platforms.Signed-off-by: Christoph Hellwig
Reviewed-by: Palmer Dabbelt
29 Jun, 2018
1 commit
-
This was introduced more than a decade ago when sg chaining was
added, but we never really caught anything with it. The scatterlist
entry size can be critical, since drivers allocate it, so remove
the magic member. Recently it's been triggering allocation stalls
and failures in NVMe.Tested-by: Jordan Glover
Acked-by: Christoph Hellwig
Signed-off-by: Jens Axboe
06 Apr, 2018
1 commit
-
Pull block layer updates from Jens Axboe:
"It's a pretty quiet round this time, which is nice. This contains:- series from Bart, cleaning up the way we set/test/clear atomic
queue flags.- series from Bart, fixing races between gendisk and queue
registration and removal.- set of bcache fixes and improvements from various folks, by way of
Michael Lyle.- set of lightnvm updates from Matias, most of it being the 1.2 to
2.0 transition.- removal of unused DIO flags from Nikolay.
- blk-mq/sbitmap memory ordering fixes from Omar.
- divide-by-zero fix for BFQ from Paolo.
- minor documentation patches from Randy.
- timeout fix from Tejun.
- Alpha "can't write a char atomically" fix from Mikulas.
- set of NVMe fixes by way of Keith.
- bsg and bsg-lib improvements from Christoph.
- a few sed-opal fixes from Jonas.
- cdrom check-disk-change deadlock fix from Maurizio.
- various little fixes, comment fixes, etc from various folks"
* tag 'for-4.17/block-20180402' of git://git.kernel.dk/linux-block: (139 commits)
blk-mq: Directly schedule q->timeout_work when aborting a request
blktrace: fix comment in blktrace_api.h
lightnvm: remove function name in strings
lightnvm: pblk: remove some unnecessary NULL checks
lightnvm: pblk: don't recover unwritten lines
lightnvm: pblk: implement 2.0 support
lightnvm: pblk: implement get log report chunk
lightnvm: pblk: rename ppaf* to addrf*
lightnvm: pblk: check for supported version
lightnvm: implement get log report chunk helpers
lightnvm: make address conversions depend on generic device
lightnvm: add support for 2.0 address format
lightnvm: normalize geometry nomenclature
lightnvm: complete geo structure with maxoc*
lightnvm: add shorten OCSSD version in geo
lightnvm: add minor version to generic geometry
lightnvm: simplify geometry structure
lightnvm: pblk: refactor init/exit sequences
lightnvm: Avoid validation of default op value
lightnvm: centralize permission check for lightnvm ioctl
...
31 Mar, 2018
1 commit
-
sg_init_marker initializes sg_magic in the sg table and calls
sg_mark_end() on the last entry of the table. This can be useful to
avoid memset in sg_init_table() when scatterlist is already zeroed outFor example: when scatterlist is embedded inside other struct and that
container struct is zeroed outSuggested-by: Daniel Borkmann
Signed-off-by: Prashant Bhole
Acked-by: John Fastabend
Signed-off-by: Daniel Borkmann
01 Mar, 2018
1 commit
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This replaces scatterlist->page_link LSB encodings with SG_CHAIN and
SG_END definitions without any functional change.Signed-off-by: Anshuman Khandual
Signed-off-by: Jens Axboe
20 Jan, 2018
1 commit
-
This patch avoids that workloads with large block sizes (megabytes)
can trigger the following call stack with the ib_srpt driver (that
driver is the only driver that chains scatterlists allocated by
sgl_alloc_order()):BUG: Bad page state in process kworker/0:1H pfn:2423a78
page:fffffb03d08e9e00 count:-3 mapcount:0 mapping: (null) index:0x0
flags: 0x57ffffc0000000()
raw: 0057ffffc0000000 0000000000000000 0000000000000000 fffffffdffffffff
raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000
page dumped because: nonzero _count
CPU: 0 PID: 733 Comm: kworker/0:1H Tainted: G I 4.15.0-rc7.bart+ #1
Hardware name: HP ProLiant DL380 G7, BIOS P67 08/16/2015
Workqueue: ib-comp-wq ib_cq_poll_work [ib_core]
Call Trace:
dump_stack+0x5c/0x83
bad_page+0xf5/0x10f
get_page_from_freelist+0xa46/0x11b0
__alloc_pages_nodemask+0x103/0x290
sgl_alloc_order+0x101/0x180
target_alloc_sgl+0x2c/0x40 [target_core_mod]
srpt_alloc_rw_ctxs+0x173/0x2d0 [ib_srpt]
srpt_handle_new_iu+0x61e/0x7f0 [ib_srpt]
__ib_process_cq+0x55/0xa0 [ib_core]
ib_cq_poll_work+0x1b/0x60 [ib_core]
process_one_work+0x141/0x340
worker_thread+0x47/0x3e0
kthread+0xf5/0x130
ret_from_fork+0x1f/0x30Fixes: e80a0af4759a ("lib/scatterlist: Introduce sgl_alloc() and sgl_free()")
Reported-by: Laurence Oberman
Tested-by: Laurence Oberman
Signed-off-by: Bart Van Assche
Cc: Nicholas A. Bellinger
Cc: Laurence Oberman
Signed-off-by: Jens Axboe
07 Jan, 2018
1 commit
-
Many kernel drivers contain code that allocates and frees both a
scatterlist and the pages that populate that scatterlist.
Introduce functions in lib/scatterlist.c that perform these tasks
instead of duplicating this functionality in multiple drivers.
Only include these functions in the build if CONFIG_SGL_ALLOC=y
to avoid that the kernel size increases if this functionality is
not used.Signed-off-by: Bart Van Assche
Reviewed-by: Hannes Reinecke
Reviewed-by: Johannes Thumshirn
Signed-off-by: Jens Axboe
16 Nov, 2017
1 commit
-
Pull drm updates from Dave Airlie:
"This is the main drm pull request for v4.15.Core:
- Atomic object lifetime fixes
- Atomic iterator improvements
- Sparse/smatch fixes
- Legacy kms ioctls to be interruptible
- EDID override improvements
- fb/gem helper cleanups
- Simple outreachy patches
- Documentation improvements
- Fix dma-buf rcu races
- DRM mode object leasing for improving VR use cases.
- vgaarb improvements for non-x86 platforms.New driver:
- tve200: Faraday Technology TVE200 block.This "TV Encoder" encodes a ITU-T BT.656 stream and can be found in
the StorLink SL3516 (later Cortina Systems CS3516) as well as the
Grain Media GM8180.New bridges:
- SiI9234 supportNew panels:
- S6E63J0X03, OTM8009A, Seiko 43WVF1G, 7" rpi touch panel, Toshiba
LT089AC19000, Innolux AT043TN24i915:
- Remove Coffeelake from alpha support
- Cannonlake workarounds
- Infoframe refactoring for DisplayPort
- VBT updates
- DisplayPort vswing/emph/buffer translation refactoring
- CCS fixes
- Restore GPU clock boost on missed vblanks
- Scatter list updates for userptr allocations
- Gen9+ transition watermarks
- Display IPC (Isochronous Priority Control)
- Private PAT management
- GVT: improved error handling and pci config sanitizing
- Execlist refactoring
- Transparent Huge Page support
- User defined priorities support
- HuC/GuC firmware refactoring
- DP MST fixes
- eDP power sequencing fixes
- Use RCU instead of stop_machine
- PSR state tracking support
- Eviction fixes
- BDW DP aux channel timeout fixes
- LSPCON fixes
- Cannonlake PLL fixesamdgpu:
- Per VM BO support
- Powerplay cleanups
- CI powerplay support
- PASID mgr for kfd
- SR-IOV fixes
- initial GPU reset for vega10
- Prime mmap support
- TTM updates
- Clock query interface for Raven
- Fence to handle ioctl
- UVD encode ring support on Polaris
- Transparent huge page DMA support
- Compute LRU pipe tweaks
- BO flag to allow buffers to opt out of implicit sync
- CTX priority setting API
- VRAM lost infrastructure plumbingqxl:
- fix flicker since atomic reworkamdkfd:
- Further improvements from internal AMD tree
- Usermode events
- Drop radeon supportnouveau:
- Pascal temperature sensor support
- Improved BAR2 handling
- MMU rework to support Pascal MMUexynos:
- Improved HDMI/mixer support
- HDMI audio interface supporttegra:
- Prep work for tegra186
- Cleanup/fixesmsm:
- Preemption support for a5xx
- Display fixes for 8x96 (snapdragon 820)
- Async cursor plane fixes
- FW loading rework
- GPU debugging improvementsvc4:
- Prep for DSI panels
- fix T-format tiling scanout
- New madvise ioctlRockchip:
- LVDS supportomapdrm:
- omap4 HDMI CEC supportetnaviv:
- GPU performance counters groundworksun4i:
- refactor driver load + TCON backend
- HDMI improvements
- A31 support
- Misc fixesudl:
- Probe/EDID read fixes.tilcdc:
- Misc fixes.pl111:
- Support more variantsadv7511:
- Improve EDID handling.
- HDMI CEC supportsii8620:
- Add remote control support"* tag 'drm-for-v4.15' of git://people.freedesktop.org/~airlied/linux: (1480 commits)
drm/rockchip: analogix_dp: Use mutex rather than spinlock
drm/mode_object: fix documentation for object lookups.
drm/i915: Reorder context-close to avoid calling i915_vma_close() under RCU
drm/i915: Move init_clock_gating() back to where it was
drm/i915: Prune the reservation shared fence array
drm/i915: Idle the GPU before shinking everything
drm/i915: Lock llist_del_first() vs llist_del_all()
drm/i915: Calculate ironlake intermediate watermarks correctly, v2.
drm/i915: Disable lazy PPGTT page table optimization for vGPU
drm/i915/execlists: Remove the priority "optimisation"
drm/i915: Filter out spurious execlists context-switch interrupts
drm/amdgpu: use irq-safe lock for kiq->ring_lock
drm/amdgpu: bypass lru touch for KIQ ring submission
drm/amdgpu: Potential uninitialized variable in amdgpu_vm_update_directories()
drm/amdgpu: potential uninitialized variable in amdgpu_vce_ring_parse_cs()
drm/amd/powerplay: initialize a variable before using it
drm/amd/powerplay: suppress KASAN out of bounds warning in vega10_populate_all_memory_levels
drm/amd/amdgpu: fix evicted VRAM bo adjudgement condition
drm/vblank: Tune drm_crtc_accurate_vblank_count() WARN down to a debug
drm/rockchip: add CONFIG_OF dependency for lvds
...
02 Nov, 2017
1 commit
-
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.By default all files without license information are under the default
license of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if
Reviewed-by: Philippe Ombredanne
Reviewed-by: Thomas Gleixner
Signed-off-by: Greg Kroah-Hartman
07 Sep, 2017
3 commits
-
Drivers like i915 benefit from being able to control the maxium
size of the sg coalesced segment while building the scatter-
gather list.Introduce and export the __sg_alloc_table_from_pages function
which will allow it that control.v2: Reorder parameters. (Chris Wilson)
v3: Fix incomplete reordering in v2.
v4: max_segment needs to be page aligned.
v5: Rebase.
v6: Rebase.
v7: Fix spelling in commit and mention max segment size in
__sg_alloc_table_from_pages kerneldoc. (Andrew Morton)Signed-off-by: Tvrtko Ursulin
Cc: Masahiro Yamada
Cc: linux-kernel@vger.kernel.org
Cc: Chris Wilson
Reviewed-by: Chris Wilson
Cc: Joonas Lahtinen
Cc: Andrew Morton
Link: https://patchwork.freedesktop.org/patch/msgid/20170803091351.23594-1-tvrtko.ursulin@linux.intel.com -
Since the scatterlist length field is an unsigned int, make
sure that sg_alloc_table_from_pages does not overflow it while
coalescing pages to a single entry.v2: Drop reference to future use. Use UINT_MAX.
v3: max_segment must be page aligned.
v4: Do not rely on compiler to optimise out the rounddown.
(Joonas Lahtinen)
v5: Simplified loops and use post-increments rather than
pre-increments. Use PAGE_MASK and fix comment typo.
(Andy Shevchenko)
v6: Commit spelling fix.Signed-off-by: Tvrtko Ursulin
Cc: Masahiro Yamada
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Chris Wilson
Cc: Joonas Lahtinen
Cc: Andy Shevchenko
Link: https://patchwork.freedesktop.org/patch/msgid/20170803091312.22875-1-tvrtko.ursulin@linux.intel.com -
Scatterlist entries have an unsigned int for the offset so
correct the sg_alloc_table_from_pages function accordingly.Since these are offsets withing a page, unsigned int is
wide enough.Also converts callers which were using unsigned long locally
with the lower_32_bits annotation to make it explicitly
clear what is happening.v2: Use offset_in_page. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin
Cc: Masahiro Yamada
Cc: Pawel Osciak
Cc: Marek Szyprowski
Cc: Kyungmin Park
Cc: Tomasz Stanislawski
Cc: Matt Porter
Cc: Alexandre Bounine
Cc: linux-media@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Marek Szyprowski (v1)
Reviewed-by: Chris Wilson
Reviewed-by: Mauro Carvalho Chehab
Link: https://patchwork.freedesktop.org/patch/msgid/20170731185512.20010-1-tvrtko.ursulin@linux.intel.com
15 Jun, 2017
1 commit
-
The sg_zero_buffer() helper is used to zero fill an area in a SG
list.Signed-off-by: Johannes Thumshirn
Reviewed-by: Sagi Grimberg
[hch: renamed to sg_zero_buffer]
Signed-off-by: Christoph Hellwig
16 Apr, 2016
1 commit
-
Now it's ready to move the mempool based SG chained allocator code from
SCSI driver to lib/sg_pool.c, which will be compiled only based on a Kconfig
symbol CONFIG_SG_POOL.SCSI selects CONFIG_SG_POOL.
Reviewed-by: Christoph Hellwig
Signed-off-by: Ming Lin
Reviewed-by: Sagi Grimberg
Signed-off-by: Martin K. Petersen
25 Aug, 2015
1 commit
-
Sometimes a scatter-gather has to be split into several chunks, or sub
scatter lists. This happens for example if a scatter list will be
handled by multiple DMA channels, each one filling a part of it.A concrete example comes with the media V4L2 API, where the scatter list
is allocated from userspace to hold an image, regardless of the
knowledge of how many DMAs will fill it :
- in a simple RGB565 case, one DMA will pump data from the camera ISP
to memory
- in the trickier YUV422 case, 3 DMAs will pump data from the camera
ISP pipes, one for pipe Y, one for pipe U and one for pipe VFor these cases, it is necessary to split the original scatter list into
multiple scatter lists, which is the purpose of this patch.The guarantees that are required for this patch are :
- the intersection of spans of any couple of resulting scatter lists is
empty.
- the union of spans of all resulting scatter lists is a subrange of
the span of the original scatter list.
- streaming DMA API operations (mapping, unmapping) should not happen
both on both the resulting and the original scatter list. It's either
the first or the later ones.
- the caller is reponsible to call kfree() on the resulting
scatterlists.Signed-off-by: Robert Jarzmik
Signed-off-by: Jens Axboe
17 Aug, 2015
1 commit
-
There are a couple of uses of struct scatterlist that never go to
the dma_map_sg() helper and thus don't care about ARCH_HAS_SG_CHAIN
which indicates that we can map chained S/G list.The most important one is the crypto code, which currently has
to open code a few helpers to always allow chaining. This patch
removes a few #ifdef ARCH_HAS_SG_CHAIN statements so that we can
switch the crypto code to these common helpers.Signed-off-by: Christoph Hellwig
Signed-off-by: Jens Axboe
01 Jul, 2015
2 commits
-
do_device_access() takes a separate parameter to indicate the direction of
data transfer, which it used to use to select the appropriate function out
of sg_pcopy_{to,from}_buffer(). However these two functions now haveSo this patch makes it bypass these wrappers and call the underlying
function sg_copy_buffer() directly; this has the same calling style as
do_device_access() i.e. a separate direction-of-transfer parameter and no
pointers-to-const, so skipping the wrappers not only eliminates the
warning, it also make the code simpler :)[akpm@linux-foundation.org: fix very broken build]
Signed-off-by: Dave Gordon
Acked-by: Arnd Bergmann
Cc: James Bottomley
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The 'buf' parameter of sg(p)copy_from_buffer() can and should be
const-qualified, although because of the shared implementation of
_to_buffer() and _from_buffer(), we have to cast this away internally.This means that callers who have a 'const' buffer containing the data to
be copied to the sg-list no longer have to cast away the const-ness
themselves. It also enables improved coverage by code analysis tools.Signed-off-by: Dave Gordon
Cc: Akinobu Mita
Cc: "Martin K. Petersen"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
26 Jun, 2015
1 commit
-
Pull asm/scatterlist.h removal from Jens Axboe:
"We don't have any specific arch scatterlist anymore, since parisc
finally switched over. Kill the include"* 'for-4.2/sg' of git://git.kernel.dk/linux-block:
remove scatterlist.h generation from arch Kbuild files
remove
03 Jun, 2015
1 commit
-
When performing a dma_map_sg() call, the number of sg entries to map is
required. Using sg_nents to retrieve the number of sg entries will
return the total number of entries in the sg list up to the entry marked
as the end. If there happen to be unused entries in the list, these will
still be counted. Some dma_map_sg() implementations will not handle the
unused entries correctly (lib/swiotlb.c) and execute a BUG_ON.The sg_nents_for_len() function will traverse the sg list and return the
number of entries required to satisfy the supplied length argument. This
can then be supplied to the dma_map_sg() call to successfully map the
sg.Signed-off-by: Tom Lendacky
Signed-off-by: Herbert Xu
06 May, 2015
1 commit
-
We don't have any arch specific scatterlist now that parisc switched over
to the generic one.Signed-off-by: Christoph Hellwig
Signed-off-by: Jens Axboe
09 Aug, 2014
1 commit
-
Rather than have architectures #define ARCH_HAS_SG_CHAIN in an
architecture specific scatterlist.h, make it a proper Kconfig option and
use that instead. At same time, remove the header files are are now
mostly useless and just include asm-generic/scatterlist.h.[sfr@canb.auug.org.au: powerpc files now need asm/dma.h]
Signed-off-by: Laura Abbott
Acked-by: Thomas Gleixner [x86]
Acked-by: Benjamin Herrenschmidt [powerpc]
Acked-by: Heiko Carstens
Cc: Russell King
Cc: Tony Luck
Cc: Fenghua Yu
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: "H. Peter Anvin"
Cc: "James E.J. Bottomley"
Cc: Martin Schwidefsky
Signed-off-by: Stephen Rothwell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
26 Jul, 2014
1 commit
-
Blk-mq drivers usually preallocate their S/G list as part of the request,
but if we want to support the very large S/G lists currently supported by
the SCSI code that would tie up a lot of memory in the preallocated request
pool. Add support to the scatterlist code so that it can initialize a
S/G list that uses a preallocated first chunks and dynamically allocated
additional chunks. That way the scsi-mq code can preallocate a first
page worth of S/G entries as part of the request, and dynamically extend
the S/G list when needed.Signed-off-by: Christoph Hellwig
Reviewed-by: Martin K. Petersen
Reviewed-by: Hannes Reinecke
Reviewed-by: Webb Scales
Acked-by: Jens Axboe
Tested-by: Bart Van Assche
Tested-by: Robert Elliott
09 Dec, 2013
1 commit
-
sg_copy_buffer() can't meet demand for some drrivers(such usb
mass storage), so we have to use the sg_miter_* APIs to access
sg buffer, then need export sg_miter_skip() for these drivers.The API is needed for converting to sg_miter_* APIs in USB storage
driver for accessing sg buffer.Acked-by: Andrew Morton
Cc: FUJITA Tomonori
Cc: Jens Axboe
Signed-off-by: Ming Lei
Reviewed-by: Tejun Heo
Signed-off-by: Greg Kroah-Hartman
10 Jul, 2013
1 commit
-
The only difference between sg_pcopy_{from,to}_buffer() and
sg_copy_{from,to}_buffer() is an additional argument that specifies the
number of bytes to skip the SG list before copying.Signed-off-by: Akinobu Mita
Cc: "David S. Miller"
Cc: "James E.J. Bottomley"
Cc: Douglas Gilbert
Cc: Herbert Xu
Cc: Horia Geanta
Cc: Imre Deak
Acked-by: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 May, 2013
1 commit
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Add a check behind CONFIG_DEBUG_SG to verify this.
Signed-off-by: Rusty Russell
Signed-off-by: Jens Axboe
03 May, 2013
1 commit
-
Pull drm updates from Dave Airlie:
"This is the main drm pull request for 3.10.Wierd bits:
- OMAP drm changes required OMAP dss changes, in drivers/video, so I
took them in here.
- one more fbcon fix for font handover
- VT switch avoidance in pm code
- scatterlist helpers for gpu drivers - have acks from akpmHighlights:
- qxl kms driver - driver for the spice qxl virtual GPUNouveau:
- fermi/kepler VRAM compression
- GK110/nvf0 modesetting support.Tegra:
- host1x core merged with 2D engine supporti915:
- vt switchless resume
- more valleyview support
- vblank fixes
- modesetting pipe config reworkradeon:
- UVD engine support
- SI chip tiling support
- GPU registers initialisation from golden values.exynos:
- device tree changes
- fimc block supportOtherwise:
- bunches of fixes all over the place."* 'drm-next' of git://people.freedesktop.org/~airlied/linux: (513 commits)
qxl: update to new idr interfaces.
drm/nouveau: fix build with nv50->nvc0
drm/radeon: fix handling of v6 power tables
drm/radeon: clarify family checks in pm table parsing
drm/radeon: consolidate UVD clock programming
drm/radeon: fix UPLL_REF_DIV_MASK definition
radeon: add bo tracking debugfs
drm/radeon: add new richland pci ids
drm/radeon: add some new SI PCI ids
drm/radeon: fix scratch reg handling for UVD fence
drm/radeon: allocate SA bo in the requested domain
drm/radeon: fix possible segfault when parsing pm tables
drm/radeon: fix endian bugs in atom_allocate_fb_scratch()
OMAPDSS: TFP410: return EPROBE_DEFER if the i2c adapter not found
OMAPDSS: VENC: Add error handling for venc_probe_pdata
OMAPDSS: HDMI: Add error handling for hdmi_probe_pdata
OMAPDSS: RFBI: Add error handling for rfbi_probe_pdata
OMAPDSS: DSI: Add error handling for dsi_probe_pdata
OMAPDSS: SDI: Add error handling for sdi_probe_pdata
OMAPDSS: DPI: Add error handling for dpi_probe_pdata
...
28 Mar, 2013
1 commit
-
The i915 driver uses sg lists for memory without backing 'struct page'
pages, similarly to other IO memory regions, setting only the DMA
address for these. It does this, so that it can program the HW MMU
tables in a uniform way both for sg lists with and without backing pages.Without a valid page pointer we can't call nth_page to get the current
page in __sg_page_iter_next, so add a helper that relevant users can
call separately. Also add a helper to get the DMA address of the current
page (idea from Daniel).Convert all places in i915, to use the new API.
Signed-off-by: Imre Deak
Reviewed-by: Damien Lespiau
Signed-off-by: Daniel Vetter
20 Mar, 2013
1 commit
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This is useful in places that recycle the same scatterlist multiple
times, and do not want to incur the cost of sg_init_table every
time in hot paths.Acked-by: Jens Axboe
Signed-off-by: Paolo Bonzini
Signed-off-by: Rusty Russell
28 Feb, 2013
2 commits
-
For better code reuse use the newly added page iterator to iterate
through the pages. The offset, length within the page is still
calculated by the mapping iterator as well as the actual mapping. Idea
from Tejun Heo.Signed-off-by: Imre Deak
Cc: Maxim Levitsky
Cc: Tejun Heo
Cc: Daniel Vetter
Cc: James Hogan
Cc: Stephen Warren
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add an iterator to walk through a scatter list a page at a time starting
at a specific page offset. As opposed to the mapping iterator this is
meant to be small, performing well even in simple loops like collecting
all pages on the scatterlist into an array or setting up an iommu table
based on the pages' DMA address.Signed-off-by: Imre Deak
Cc: Maxim Levitsky
Cc: Tejun Heo
Cc: Daniel Vetter
Tested-by: Stephen Warren
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Sep, 2012
1 commit
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Useful helper to know the number of entries in scatterlist.
Signed-off-by: Maxim Levitsky
Cc: Alex Dubov
Acked-by: Tejun Heo
Cc: Jens Axboe
Signed-off-by: Jens Axboe
30 Jul, 2012
1 commit
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This patch adds a new constructor for an sg table. The table is constructed
from an array of struct pages. All contiguous chunks of the pages are merged
into a single sg nodes. A user may provide an offset and a size of a buffer if
the buffer is not page-aligned.The function is dedicated for DMABUF exporters which often perform conversion
from an page array to a scatterlist. Moreover the scatterlist should be
squashed in order to save memory and to speed-up the process of DMA mapping
using dma_map_sg.The code is based on the patch 'v4l: vb2-dma-contig: add support for
scatterlist in userptr mode' and hints from Laurent Pinchart.Signed-off-by: Tomasz Stanislawski
Signed-off-by: Kyungmin Park
Acked-by: Daniel Vetter
Acked-by: Laurent Pinchart
Signed-off-by: Marek Szyprowski
CC: Andrew Morton
05 Mar, 2012
1 commit
-
If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any
other BUG variant in a static inline (i.e. not in a #define) then
that header really should be including and not just
expecting it to be implicitly present.We can make this change risk-free, since if the files using these
headers didn't have exposure to linux/bug.h already, they would have
been causing compile failures/warnings.Signed-off-by: Paul Gortmaker
