kernel-fxtec-pro1x/drivers/media/dvb
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
..
b2c2 V4L/DVB (7959): endianness fix in flexcop-usb.c 2008-06-05 06:35:48 -03:00
bt8xx V4L/DVB (8132): bt8xx endianness annotations and fixes 2008-07-20 07:13:31 -03:00
cinergyT2 V4L/DVB (7956): cinergyT2: endianness annotations, endianness and race fixes 2008-06-05 06:35:47 -03:00
dvb-core device create: dvb: convert device_create to device_create_drvdata 2008-07-21 21:54:42 -07:00
dvb-usb v4l-dvb: remove legacy checks to allow support for kernels < 2.6.10 2008-07-20 07:17:52 -03:00
frontends V4L/DVB (8334): tda10023: Fix typo in tda10023_attach dummy routine 2008-07-20 07:25:08 -03:00
pluto2 dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
siano V4L/DVB (8326): sms1xxx: fix missing #include <linux/types.h> 2008-07-20 07:24:53 -03:00
ttpci V4L/DVB (8335): dvb-ttpci: Fix build with CONFIG_INPUT_EVDEV=n (Bug #11042) 2008-07-20 07:25:12 -03:00
ttusb-budget V4L/DVB (8251): ttusb: use simple_read_from_buffer()() 2008-07-20 07:19:04 -03:00
ttusb-dec ttusb-dec: treat firmware data as const 2008-07-10 14:26:29 +01:00
Kconfig V4L/DVB (8272): sms1xxx: move driver from media/mdtv/ to media/dvb/siano/ 2008-07-20 07:20:47 -03:00
Makefile V4L/DVB (8272): sms1xxx: move driver from media/mdtv/ to media/dvb/siano/ 2008-07-20 07:20:47 -03:00