linux-toradex.git/include/linux/dma-mapping.h, branch v2.6.26-rc5

dma: add dma_map_attrs() interfaces

2008-04-29T15:06:11+00:00

Introduce new interfaces, dma_*map*_attrs(), for passing architecture-specific
attributes when memory is mapped and unmapped for DMA.  Give the interfaces
default implementations which ignore attributes.  Also introduce the
dma_{set|get}_attr() interfaces for setting and retrieving individual
attributes.  Define one attribute, DMA_ATTR_WRITE_BARRIER, in anticipation of
its use by ia64/sn.  Select whether architectures implement arch-specific
versions of the dma_*map*_attrs() interfaces via HAVE_DMA_ATTRS in Kconfig.

[markn@au1.ibm.com: dma_{set,get}_attr() have to be static inline]
Signed-off-by: Arthur Kepner 
Cc: Tony Luck 
Cc: Jesse Barnes 
Cc: Jes Sorensen 
Cc: Randy Dunlap 
Cc: Roland Dreier 
Cc: James Bottomley 
Cc: David Miller 
Cc: Benjamin Herrenschmidt 
Cc: Grant Grundler 
Cc: Michael Ellerman 
Signed-off-by: Mark Nelson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

iommu sg merging: add accessors for segment_boundary_mask in device_dma_parameters()

2008-02-05T17:44:11+00:00

This adds new accessors for segment_boundary_mask in device_dma_parameters
structure in the same way I did for max_segment_size.  So we can easily change
where to place struct device_dma_parameters in the future.

dma_get_segment boundary returns 0xffffffff if dma_parms in struct device
isn't set up properly.  0xffffffff is the default value used in the block
layer and the scsi mid layer.

Signed-off-by: FUJITA Tomonori 
Cc: James Bottomley 
Cc: Jens Axboe 
Cc: Greg KH 
Cc: Jeff Garzik 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

iommu sg merging: add device_dma_parameters structure

2008-02-05T17:44:10+00:00

IOMMUs merges scatter/gather segments without considering a low level
driver's restrictions. The problem is that IOMMUs can't access to the
limitations because they are in request_queue.

This patchset introduces a new structure, device_dma_parameters,
including dma information. A pointer to device_dma_parameters is added
to struct device. The bus specific structures (like pci_dev) includes
device_dma_parameters. Low level drivers can use dma_set_max_seg_size
to tell IOMMUs about the restrictions.

We can move more dma stuff in struct device (like dma_mask) to struct
device_dma_parameters later (needs some cleanups before that).

This includes patches for all the IOMMUs that could merge sg (x86_64,
ppc, IA64, alpha, sparc64, and parisc) though only the ppc patch was
tested. The patches for other IOMMUs are only compile tested.

This patch:

Add a new structure, device_dma_parameters, including dma information.  A
pointer to device_dma_parameters is added to struct device.

- there are only max_segment_size and segment_boundary_mask there but we'll
  move more dma stuff in struct device (like dma_mask) to struct
  device_dma_parameters later.  segment_boundary_mask is not supported yet.

- new accessors for the dma parameters are added.  So we can easily change
  where to place struct device_dma_parameters in the future.

- dma_get_max_seg_size returns 64K if dma_parms in struct device isn't set
  up properly.  64K is the default max_segment_size in the block layer.

Signed-off-by: FUJITA Tomonori 
Acked-by: Jeff Garzik 
Cc: James Bottomley 
Acked-by: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

linux/dma-mapping.h: rename macro to prevent multiple inclusion

2008-02-03T13:06:26+00:00

Having the macro to prevent multiple inclusion of
include/linux/dma-mapping.h contain the prefix "_ASM" is just begging
for possible confusion some day.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Adrian Bunk

stop using DMA_xxBIT_MASK

2007-10-18T21:37:21+00:00

Now that we have DMA_BIT_MASK(), these macros are pointless.

Cc: Jeremy Fitzhardinge 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

unify DMA_..BIT_MASK definitions: v3.1

2007-10-18T21:37:21+00:00

Remove redundant DMA_..BIT_MASK definitions across two drivers.  The
computation of the majority of the bitmasks is done by the compiler.  The
initial split of the patch touching each a different file got removed due
to possible git bisect breakage.

Signed-off-by: Borislav Petkov 
Cc: Jeremy Fitzhardinge 
Cc: Muli Ben-Yehuda 
Cc: Jeff Garzik 
Cc: James Bottomley 
Reviewed-by: Satyam Sharma 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

introduce DMA_MASK_NONE as a signal for unable to do DMA

2007-10-16T16:42:50+00:00

Some devices are incapable of DMA and need to be recognised as such.
Introduce a NONE dma mask to facilitate this plus an inline function:
is_device_dma_capable() to check this.

Signed-off-by: James Bottomley 
Cc: Andi Kleen 
Cc: Alan Cox 
Cc: Tejun Heo 
Cc: Natalie Protasevich 
Cc: Jeff Garzik 
Cc: Dominik Brodowski 
Cc: Russell King 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs

2007-07-16T16:05:45+00:00

Continuing the work started in 411f0f3edc141a582190d3605cadd1d993abb6df ...

This enables code with a dma path, that compiles away, to build without
requiring additional code factoring.  It also prevents code that calls
dma_alloc_coherent and dma_free_coherent from linking whereas previously
the code would hit a BUG() at run time.  Finally, it allows archs that set
!HAS_DMA to delete their asm/dma-mapping.h file.

Cc: Cornelia Huck 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: John W. Linville 
Cc: Kyle McMartin 
Cc: James Bottomley 
Cc: Tejun Heo 
Cc: Jeff Garzik 
Cc: 
Cc: 
Cc: 
Cc: 
Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

devres: device resource management

2007-02-09T22:39:36+00:00

Implement device resource management, in short, devres.  A device
driver can allocate arbirary size of devres data which is associated
with a release function.  On driver detach, release function is
invoked on the devres data, then, devres data is freed.

devreses are typed by associated release functions.  Some devreses are
better represented by single instance of the type while others need
multiple instances sharing the same release function.  Both usages are
supported.

devreses can be grouped using devres group such that a device driver
can easily release acquired resources halfway through initialization
or selectively release resources (e.g. resources for port 1 out of 4
ports).

This patch adds devres core including documentation and the following
managed interfaces.

* alloc/free	: devm_kzalloc(), devm_kzfree()
* IO region	: devm_request_region(), devm_release_region()
* IRQ		: devm_request_irq(), devm_free_irq()
* DMA		: dmam_alloc_coherent(), dmam_free_coherent(),
		  dmam_declare_coherent_memory(), dmam_pool_create(),
		  dmam_pool_destroy()
* PCI		: pcim_enable_device(), pcim_pin_device(), pci_is_managed()
* iomap		: devm_ioport_map(), devm_ioport_unmap(), devm_ioremap(),
		  devm_ioremap_nocache(), devm_iounmap(), pcim_iomap_table(),
		  pcim_iomap(), pcim_iounmap()

Signed-off-by: Tejun Heo 
Signed-off-by: Jeff Garzik

[PATCH] Move valid_dma_direction() from x86_64 to generic code

2006-09-29T16:18:10+00:00

As suggested by Muli Ben-Yehuda this function is moved to generic code as
may be useful for all archs.

[akpm@osdl.org: fix]
Signed-off-by: Rolf Eike Beer 
Cc: Muli Ben-Yehuda 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds