Commit graph

32 commits

Author SHA1 Message Date
Russell King
0e18b5d7c6 [ARM] dma: add validation of DMA params
Validate the direction argument like x86 does.  In addition,
validate the dma_unmap_* parameters against those passed to
dma_map_* when using the DMA bounce code.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-29 13:54:28 +01:00
Russell King
3216a97bb0 [ARM] dma: coding style cleanups
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-29 10:41:02 +01:00
Russell King
125ab12acf [ARM] dma: fix dmabounce dma_sync_xxx() implementations
The dmabounce dma_sync_xxx() implementation have been broken for
quite some time; they all copy data between the DMA buffer and
the CPU visible buffer no irrespective of the change of ownership.
(IOW, a DMA_FROM_DEVICE mapping copies data from the DMA buffer
to the CPU buffer during a call to dma_sync_single_for_device().)

Fix it by getting rid of sync_single(), moving the contents into
the recently created dmabounce_sync_for_xxx() functions and adjusting
appropriately.

This also makes it possible to properly support the DMA range sync
functions.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-29 10:40:22 +01:00
Russell King
8c8a0ec57e [ARM] dma: use new dmabounce_sync_for_xxx() for dma_sync_single_xxx()
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-29 10:40:16 +01:00
Russell King
2638b4dbe7 [ARM] dma: Reduce to one dma_sync_sg_* implementation
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-29 10:40:16 +01:00
Russell King
01135d92c1 [ARM] dma: Reduce to one dma_map_sg()/dma_unmap_sg() implementation
No point having two of these; dma_map_page() can do all the work
for us.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-25 23:39:24 +01:00
Russell King
56f55f8b58 [ARM] dma: provide a better dma_map_page() implementation
We can translate a struct page directly to a DMA address using
page_to_dma().  No need to use page_address() followed by
virt_to_dma().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-25 23:39:24 +01:00
Russell King
afd1a321c4 [ARM] Update dma_map_sg()/dma_unmap_sg() API
Update the ARM DMA scatter gather APIs for the scatterlist changes.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-25 20:48:45 +01:00
Russell King
9dd4286805 [ARM] dma-mapping: provide sync_range APIs
Convert the existing dma_sync_single_for_* APIs to the new range based
APIs, and make the dma_sync_single_for_* API a superset of it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-10 14:05:14 +01:00
Russell King
98ed7d4b1a [ARM] dma-mapping: improve type-safeness of DMA translations
OMAP at least gets the return type(s) for the DMA translation functions
wrong, which can lead to subtle errors.  Avoid this by moving the DMA
translation functions to asm/dma-mapping.h, and converting them to
inline functions.

Fix the OMAP DMA translation macros to use the correct argument and
result types.

Also, remove the unnecessary casts in dmabounce.c.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-10 12:10:49 +01:00
FUJITA Tomonori
8d8bb39b9e dma-mapping: add the device argument to dma_mapping_error()
Add per-device dma_mapping_ops support for CONFIG_X86_64 as POWER
architecture does:

This enables us to cleanly fix the Calgary IOMMU issue that some devices
are not behind the IOMMU (http://lkml.org/lkml/2008/5/8/423).

I think that per-device dma_mapping_ops support would be also helpful for
KVM people to support PCI passthrough but Andi thinks that this makes it
difficult to support the PCI passthrough (see the above thread).  So I
CC'ed this to KVM camp.  Comments are appreciated.

A pointer to dma_mapping_ops to struct dev_archdata is added.  If the
pointer is non NULL, DMA operations in asm/dma-mapping.h use it.  If it's
NULL, the system-wide dma_ops pointer is used as before.

If it's useful for KVM people, I plan to implement a mechanism to register
a hook called when a new pci (or dma capable) device is created (it works
with hot plugging).  It enables IOMMUs to set up an appropriate
dma_mapping_ops per device.

The major obstacle is that dma_mapping_error doesn't take a pointer to the
device unlike other DMA operations.  So x86 can't have dma_mapping_ops per
device.  Note all the POWER IOMMUs use the same dma_mapping_error function
so this is not a problem for POWER but x86 IOMMUs use different
dma_mapping_error functions.

The first patch adds the device argument to dma_mapping_error.  The patch
is trivial but large since it touches lots of drivers and dma-mapping.h in
all the architecture.

This patch:

dma_mapping_error() doesn't take a pointer to the device unlike other DMA
operations.  So we can't have dma_mapping_ops per device.

Note that POWER already has dma_mapping_ops per device but all the POWER
IOMMUs use the same dma_mapping_error function.  x86 IOMMUs use device
argument.

[akpm@linux-foundation.org: fix sge]
[akpm@linux-foundation.org: fix svc_rdma]
[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix bnx2x]
[akpm@linux-foundation.org: fix s2io]
[akpm@linux-foundation.org: fix pasemi_mac]
[akpm@linux-foundation.org: fix sdhci]
[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix sparc]
[akpm@linux-foundation.org: fix ibmvscsi]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26 12:00:03 -07:00
Greg Kroah-Hartman
fc3a8828b1 driver core: fix a lot of printk usages of bus_id
We have the dev_printk() variants for this kind of thing, use them
instead of directly trying to access the bus_id field of struct device.

This is done in order to remove bus_id entirely.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-21 21:54:53 -07:00
Russell King
fc6e14f4fb [ARM] Export dma_sync_sg_for_device()
Noticed by Martin Michlmayr, this missing export prevents IEEE1394
from building with:

ERROR: "dma_sync_sg_for_device" [drivers/ieee1394/ieee1394.ko] undefined!

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-06-22 15:41:30 +01:00
FUJITA Tomonori
9f2326be52 arm: build fix
arch/arm/common/dmabounce.c: In function 'dma_map_sg':
arch/arm/common/dmabounce.c:445: error: implicit declaration of function 'sg_page'

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-23 09:11:41 +02:00
Jens Axboe
58b053e4ce Update arch/ to use sg helpers
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-22 21:19:59 +02:00
Russell King
84aa462e2c [ARM] Rename consistent_sync() as dma_cache_maint()
consistent_sync() is used to handle the cache maintainence issues with
DMA operations.  Since we've now removed the misuse of this function
from the two MTD drivers, rename it to prevent future mis-use.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-10-12 23:43:45 +01:00
Simon Arlott
6cbdc8c535 [ARM] spelling fixes
Spelling fixes in arch/arm/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-20 20:10:32 +01:00
Russell King
f69eda00d4 Merge AT91, EP93xx, General devel, PXA, S3C, V6+ and Xscale trees 2007-02-17 20:09:53 +00:00
Russell King
017cc022b6 [ARM] Convert dmabounce statistics to use a device attribute
Rather than printk'ing the dmabounce statistics occasionally to
the kernel log, provide a sysfs file to allow this information
to be periodically read.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-12 10:53:50 +00:00
Russell King
ab2c21529d [ARM] Add a reference from struct device to the dma bounce info
dmabounce keeps a per-device structure, and finds the correct
structure by walking a list.  Since architectures can now add
fields to struct device, we can attach this structure direct to
the struct device, thereby eliminating the code to search the
list.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-12 10:28:24 +00:00
Russell King
7ae5a761d2 [ARM] Convert DMA cache handling to take const void * args
The DMA cache handling functions take virtual addresses, but in the
form of unsigned long arguments.  This leads to a little confusion
about what exactly they take.  So, convert them to take const void *
instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-08 14:49:44 +00:00
Catalin Marinas
953233dc99 [ARM] 4134/1: Add generic support for outer caches
The outer cache can be L2 as on RealView/EB MPCore platform or even L3
or further on ARMv7 cores. This patch adds the generic support for
flushing the outer cache in the DMA operations.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-08 14:49:40 +00:00
Russell King
7f8e33546d [ARM] Don't call consistent_sync() for DMA coherent memory
Memory allocated by the coherent memory allocators will be marked
uncacheable, which means it's pointless calling consistent_sync()
to perform cache maintainence on this memory; it's just a waste of
CPU cycles.

Moreover, with the (subsequent) merge of outer cache support, it
actually breaks things to call consistent_sync() on anything but
direct-mapped memory.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-08 14:49:37 +00:00
Kevin Hilman
73218187e8 [ARM] 3917/1: Fix dmabounce symbol exports
dma_sync_single is no more (and to be removed in 2.7) so this export should be dma_sync_single_for_cpu.

Also export dma_sync_single_for_device.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-11-02 22:57:38 +00:00
Kevin Hilman
e2785f0d42 [ARM] 3755/1: dmabounce: fix return value for find_safe_buffer
Patch from Kevin Hilman

Previous locking changes to dmabounce incorrectly return non-NULL even
when buffer not found.  Fix it up.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-08-18 15:32:14 +01:00
Kevin Hilman
823588c186 [ARM] 3537/1: Rework DMA-bounce locking for finer granularity
Patch from Kevin Hilman

This time with IRQ versions of locks.

Rework also enables compatability with realtime-preemption patch.
With the current locking via interrupt disabling, under RT,
potentially sleeping functions can be called with interrupts
disabled.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-22 22:27:14 +01:00
Erik Hovland
3a2916aa28 [ARM] 3389/1: typo and grammar fix
Patch from Erik Hovland

I found a typo and what seems to be a run-on sentence in
arch/arm/common/dmabounce.c

This patch corrects both.

Signed-off-by: Erik Hovland <erik@hovland.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-22 21:02:11 +00:00
Russell King
cb7610d018 [ARM] Clean up dmabounce
Encapsulate pool data into dmabounce_pool.  Only account successful
allocations.  Use dma_mapping_error().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-30 21:12:08 +00:00
Russell King
b46a58fd4e [PATCH] ARM: Use list_for_each_entry() for dmabounce
Convert dmabounce.c to use list_for_each_entry() instead of
list_for_each() + list_entry().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-22 21:25:58 +01:00
Russell King
14eb75b6f8 [PATCH] ARM: Add missed include for dmabounce.c
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-20 16:56:08 +01:00
Russell King
5abc100e88 [PATCH] ARM: Ensure DMA-bounced buffers are properly written to RAM
When DMA bounce buffers were unmapped and the data was memcpy'd to
the original buffer, we were not ensuring that the data was written
to RAM.  This means that there was the potential for page cache
pages to have different cache states depending whether they've been
bounced or not.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-20 12:31:14 +01:00
Linus Torvalds
1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00