linux/drivers/net/sfc
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
..
bitfield.h sfc: Use DMA_BIT_MASK() instead of our own DMA mask macros 2008-05-22 05:59:30 -04:00
boards.c sfc: Use kernel I2C system and i2c-algo-bit driver 2008-05-30 22:18:10 -04:00
boards.h sfc: Use kernel I2C system and i2c-algo-bit driver 2008-05-30 22:18:10 -04:00
efx.c sfc: Create one RX queue and interrupt per CPU package by default 2008-07-22 19:44:15 -04:00
efx.h
enum.h [netdrvr] sfc: sfc: Add self-test support 2008-05-13 01:31:44 -04:00
ethtool.c [netdrvr] sfc: sfc: Add self-test support 2008-05-13 01:31:44 -04:00
ethtool.h
falcon.c sfc: I2C adapter initialisation fixes 2008-07-22 19:43:29 -04:00
falcon.h sfc: Replaced various macros with inline functions 2008-05-22 05:59:27 -04:00
falcon_hwdefs.h sfc: Use __packed macro 2008-05-22 05:59:32 -04:00
falcon_io.h sfc: Replaced various macros with inline functions 2008-05-22 05:59:27 -04:00
falcon_xmac.c [netdrvr] sfc: Report XAUI link down at default log level 2008-05-30 22:06:47 -04:00
gmii.h
Kconfig sfc: Use kernel I2C system and i2c-algo-bit driver 2008-05-30 22:18:10 -04:00
mac.h
Makefile sfc: Use kernel I2C system and i2c-algo-bit driver 2008-05-30 22:18:10 -04:00
mdio_10g.c [netdrvr] sfc: sfc: Add self-test support 2008-05-13 01:31:44 -04:00
mdio_10g.h [netdrvr] sfc: sfc: Add self-test support 2008-05-13 01:31:44 -04:00
net_driver.h sfc: Use a separate workqueue for resets 2008-07-22 19:44:13 -04:00
phy.h
rx.c dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
rx.h
selftest.c sfc: Added checks for heap allocation failure 2008-05-22 05:59:34 -04:00
selftest.h [netdrvr] sfc: sfc: Add self-test support 2008-05-13 01:31:44 -04:00
sfe4001.c sfc: Use kernel I2C system and i2c-algo-bit driver 2008-05-30 22:18:10 -04:00
spi.h
tenxpress.c sfc: Added checks for heap allocation failure 2008-05-22 05:59:34 -04:00
tx.c dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
tx.h
workarounds.h sfc: Replaced various macros with inline functions 2008-05-22 05:59:27 -04:00
xenpack.h
xfp_phy.c sfc: Added checks for heap allocation failure 2008-05-22 05:59:34 -04:00