kernel_optimize_test/drivers/net/mlx4
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
..
alloc.c mlx4_core: Add HW queues allocation helpers 2008-04-25 14:27:08 -07:00
catas.c mlx4_core: Fix confusion between mlx4_event and mlx4_dev_event enums 2008-04-16 21:01:08 -07:00
cmd.c mlx4_code: Add missing FW status return code 2008-07-22 14:19:39 -07:00
cq.c mlx4_core: Add a way to set the "collapsed" CQ flag 2008-04-29 13:46:50 -07:00
eq.c dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
fw.c IB/mlx4: Add support for memory management extensions and local DMA L_Key 2008-07-23 08:12:26 -07:00
fw.h IB/mlx4: Add support for memory management extensions and local DMA L_Key 2008-07-23 08:12:26 -07:00
icm.c SG: Change sg_set_page() to take length and offset argument 2007-10-24 11:20:47 +02:00
icm.h mlx4_core: Write MTTs from CPU instead with of WRITE_MTT FW command 2007-10-09 19:59:16 -07:00
intf.c mlx4_core: Fix confusion between mlx4_event and mlx4_dev_event enums 2008-04-16 21:01:08 -07:00
main.c IB/mlx4: Add support for memory management extensions and local DMA L_Key 2008-07-23 08:12:26 -07:00
Makefile
mcg.c IB/mlx4: Add support for blocking multicast loopback packets 2008-07-14 23:48:48 -07:00
mlx4.h mlx4_core: Keep free count for MTT buddy allocator 2008-07-22 14:19:40 -07:00
mr.c IB/mlx4: Add support for memory management extensions and local DMA L_Key 2008-07-23 08:12:26 -07:00
pd.c mlx4_core: Improve error message when not enough UAR pages are available 2008-07-23 08:12:47 -07:00
profile.c
qp.c mlx4_core: Add helper to move QP to ready-to-send 2008-04-25 14:52:32 -07:00
reset.c mlx4_core: Wait 1 second after reset before accessing device 2007-08-13 08:47:44 -07:00
srq.c mlx4_core: Fix section mismatches 2007-10-10 15:43:54 -07:00