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DMA-API-HOWTO: <asm/generic/scatterlist.h> is no more 
So don't mention it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Christoph Hellwig   authored and   Jonathan Corbet   commited 2016-09-16 10:00:25 -06:00
e92ae527e7
dma-mapping: always provide the dma_map_ops based implementation 
Move the generic implementation to <linux/dma-mapping.h> now that all
architectures support it and remove the HAVE_DMA_ATTR Kconfig symbol now
that everyone supports them.

[valentinrothberg@gmail.com: remove leftovers in Kconfig]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Helge Deller <deller@gmx.de>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Christoph Hellwig   authored and   Linus Torvalds   commited 2016-01-20 17:09:18 -08:00
e1c7e32453
Documentation: DMA API: Be more explicit that nents is always the same 
The nents argument to the DMA API functions operating on scatterlists is
always the same. The documentation used different argument names and the
matter was not mentioned in Documentation/DMA-API-HOWTO.txt at all. Fix
these.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Sakari Ailus   authored and   Jonathan Corbet   commited 2015-09-24 15:50:06 -06:00
7bc590b2fc
Documentation updates for 4.2 
The main thing here is Ingo's big subdirectory documenting feature support
 for each architecture.  Beyond that, it's the usual pile of fixes, tweaks,
 and small additions.
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Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

Pull documentation updates from Jonathan Corbet:
 "The main thing here is Ingo's big subdirectory documenting feature
  support for each architecture.  Beyond that, it's the usual pile of
  fixes, tweaks, and small additions"

* tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (79 commits)
  doc:md: fix typo in md.txt.
  Documentation/mic/mpssd: don't build x86 userspace when cross compiling
  Documentation/prctl: don't build tsc tests when cross compiling
  Documentation/vDSO: don't build tests when cross compiling
  Doc:ABI/testing: Fix typo in sysfs-bus-fcoe
  Doc: Docbook: Change wikipedia's URL from http to https in scsi.tmpl
  Doc: Change wikipedia's URL from http to https
  Documentation/kernel-parameters: add missing pciserial to the earlyprintk
  Doc:pps: Fix typo in pps.txt
  kbuild : Fix documentation of INSTALL_HDR_PATH
  Documentation: filesystems: updated struct file_operations documentation in vfs.txt
  kbuild: edit explanation of clean-files variable
  Doc: ja_JP: Fix typo in HOWTO
  Move freefall program from Documentation/ to tools/
  Documentation: ARM: EXYNOS: Describe boot loaders interface
  Doc:nfc: Fix typo in nfc-hci.txt
  vfs: Minor documentation fix
  Doc: networking: txtimestamp: fix printf format warning
  Documentation, intel_pstate: Improve legacy mode internal governors description
  Documentation: extend use case for EXPORT_SYMBOL_GPL()
  ...

Linus Torvalds   commited 2015-06-24 20:01:36 -07:00
1e467e68e5
PCI: Add pci_bus_addr_t 
David Ahern reported that d63e2e1f3d ("sparc/PCI: Clip bridge windows
to fit in upstream windows") fails to boot on sparc/T5-8:

  pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address 0x110204000)

The problem is that sparc64 assumed that dma_addr_t only needed to hold DMA
addresses, i.e., bus addresses returned via the DMA API (dma_map_single(),
etc.), while the PCI core assumed dma_addr_t could hold *any* bus address,
including raw BAR values.  On sparc64, all DMA addresses fit in 32 bits, so
dma_addr_t is a 32-bit type.  However, BAR values can be 64 bits wide, so
they don't fit in a dma_addr_t.  d63e2e1f3d added new checking that
tripped over this mismatch.

Add pci_bus_addr_t, which is wide enough to hold any PCI bus address,
including both raw BAR values and DMA addresses.  This will be 64 bits
on 64-bit platforms and on platforms with a 64-bit dma_addr_t.  Then
dma_addr_t only needs to be wide enough to hold addresses from the DMA API.

[bhelgaas: changelog, bugzilla, Kconfig to ensure pci_bus_addr_t is at
least as wide as dma_addr_t, documentation]
Fixes: d63e2e1f3d ("sparc/PCI: Clip bridge windows to fit in upstream windows")
Fixes: 23b13bc76f ("PCI: Fail safely if we can't handle BARs larger than 4GB")
Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com
Link: http://lkml.kernel.org/r/1427857069-6789-1-git-send-email-yinghai@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=96231
Reported-by: David Ahern <david.ahern@oracle.com>
Tested-by: David Ahern <david.ahern@oracle.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
CC: stable@vger.kernel.org	# v3.19+

Yinghai Lu   authored and   Bjorn Helgaas   commited 2015-05-29 17:21:45 -05:00
3a9ad0b4fd
DMA-API: Spelling s/This/Think/ 
Also remove spaces before TABs while we're at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Geert Uytterhoeven   authored and   Jonathan Corbet   commited 2015-05-22 09:30:47 -06:00
11e285d8ff
Documentation: correct parameter error for dma_mapping_error 
dma_mapping_error takes two parameters, but some of examples
in Documentation/DMA-API-HOWTO.txt just takes one. So correct
it.

Signed-off-by: Liu Hua <sdu.liu@huawei.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Liu Hua   authored and   Jiri Kosina   commited 2014-09-26 11:22:29 +02:00
b2dd83b377
DMA-API: Update dma_pool_create ()and dma_pool_alloc() descriptions 
Use "boundary" to be more descriptive than "alloc" in the dma_pool_create()
documentation.

Replace "SLAB_KERNEL" and "SLAB_ATOMIC" with the correct "GFP_KERNEL" and
"GFP_ATOMIC."

[bhelgaas: changelog]
Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Gioh Kim   authored and   Bjorn Helgaas   commited 2014-05-26 17:28:28 -06:00
2af9da8638
DMA-API: Fix duplicated word in DMA-API-HOWTO.txt 
"coherent" is written twice when it should be just once.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Emilio López   authored and   Bjorn Helgaas   commited 2014-05-26 17:28:27 -06:00
34c815fbdc
DMA-API: Capitalize "CPU" consistently 
Sometimes we used "cpu," other times "CPU."  Use "CPU" consistently.

Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Bjorn Helgaas   commited 2014-05-26 17:28:27 -06:00
f311a724a7
DMA-API: Clarify physical/bus address distinction 
The DMA-API documentation sometimes refers to "physical addresses" when it
really means "bus addresses."  Sometimes these are identical, but they may
be different if the bridge leading to the bus performs address translation.
Update the documentation to use "bus address" when appropriate.

Also, consistently capitalize "DMA", use parens with function names, use
dev_printk() in examples, and reword a few sections for clarity.

No functional change; documentation changes only.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: James Bottomley <jbottomley@Parallels.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>

Bjorn Helgaas   commited 2014-05-20 16:54:21 -06:00
77f2ea2f8d
DMA-API: provide a helper to set both DMA and coherent DMA masks 
Provide a helper to set both the DMA and coherent DMA masks to the
same value - this avoids duplicated code in a number of drivers,
sometimes with buggy error handling, and also allows us identify
which drivers do things differently.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Russell King   commited 2013-09-17 15:32:37 +01:00
4aa806b771
Documentation/DMA-API-HOWTO.txt: fix typo 
Noted by Jesper

Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Shuah Khan <shuah.khan@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Andrew Morton   authored and   Linus Torvalds   commited 2013-02-27 19:10:23 -08:00
11cd3db01b
Documentation/DMA-API-HOWTO.txt: minor grammar corrections 
Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Shuah Khan   authored and   Linus Torvalds   commited 2013-02-27 19:10:11 -08:00
be62bc4100
Documentation DMA-API-HOWTO.txt Add dma mapping error check usage examples 
Enhance the document to discuss the importance of dma
mapping error checks after dma_map_single() and
dma_map_page() calls. Also added usage examples that include
unmap examples in error paths when dma mapping error is
returned.  Includes correct and incorrect usages to high
light some common mistakes in error paths especially when
dma mapping fails when more than one dma mapping call is
made.

Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

Shuah Khan   authored and   Joerg Roedel   commited 2012-10-24 17:07:43 +02:00
8d7f62e6a7
Documentation/DMA-API-HOWTO.txt: fix misleading example 
See: DMA-API.txt, part Id, DMA_FROM_DEVICE description.

Signed-off-by: Michal Miroslaw <mirq-linux@rere.qmqm.pl>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Michal Miroslaw   authored and   Linus Torvalds   commited 2011-07-26 16:49:45 -07:00
3f0fb4e85b
Documentation: DMA-API-HOWTO.txt: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN 
ARCH_KMALLOC_MINALIGN was renamed to ARCH_DMA_MINALIGN (the commit
a6eb9fe105).

ARCH_DMA_MINALIGN must be defined instead of ARCH_KMALLOC_MINALIGN to
ensure that kmalloc'ed buffer is DMA-safe.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-08-14 11:56:46 -07:00
ce00f7feb0
Documentation: DMA-API-HOWTO.txt: add multiple types of IOMMUs support 
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-08-11 08:59:21 -07:00
c31e74c4c3
Documentation/DMA-API-HOWTO: add ARCH_KMALLOC_MINALIGN description 
Add ARCH_KMALLOC_MINALIGN description in "Platform Issues" section.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-05-27 09:12:53 -07:00
2fd74e25df
Documentation: move the error handling to the better place in DMA-API-HOWTO 
Handing DMA mapping errors is essential.  Let's put it in the more
appropriate place rather than the end of the doc.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-05-27 09:12:53 -07:00
4ae9ca825e
Documentation: update scatterlist struct description in DMA-API-HOWTO 
Now we have <asm-generic/scatterlist.h>.  Architectures should use it
instead of inventing the own scatterlist struct.  Let's update the
description.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-05-27 09:12:53 -07:00
b02de87161
Documentation: add SCSI drivers' mapping error handling to DMA-API-HOWTO 
Add the concrete DMA mapping error handling for SCSI drivers on the
queuecommand path.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-05-27 09:12:53 -07:00
7cdcc8e476
Documentation: add networking driver's mapping error handling to DMA-API-HOWTO 
Adds the concrete DMA mapping error handling for Networking drivers on the
transmit path.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-05-27 09:12:52 -07:00
f671be04dc
Documentation/: it's -> its where appropriate 
Fix obvious cases of "it's" being used when "its" was meant.

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Francis Galiegue   authored and   Jiri Kosina   commited 2010-04-23 02:09:52 +02:00
a33f32244d
Documentation: rename PCI/PCI-DMA-mapping.txt to DMA-API-HOWTO.txt 
This patch renames PCI/PCI-DMA-mapping.txt to DMA-API-HOWTO.txt.

The commit 51e7364ef2 "Documentation: rename
PCI-DMA-mapping.txt to DMA-API-HOWTO.txt" was supposed to do this but it
didn't.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

FUJITA Tomonori   authored and   Linus Torvalds   commited 2010-03-24 16:31:20 -07:00
5e07c2c730
Renamed from Documentation/PCI/PCI-DMA-mapping.txt (Browse further)