linux-toradex.git/drivers/dma, branch v2.6.25-rc2

async_tx: replace 'int_en' with operation preparation flags

2008-02-06T17:12:18+00:00

Pass a full set of flags to drivers' per-operation 'prep' routines.
Currently the only flag passed is DMA_PREP_INTERRUPT.  The expectation is
that arch-specific async_tx_find_channel() implementations can exploit this
capability to find the best channel for an operation.

Signed-off-by: Dan Williams 
Acked-by: Shannon Nelson 
Reviewed-by: Haavard Skinnemoen

async_tx: kill tx_set_src and tx_set_dest methods

2008-02-06T17:12:17+00:00

The tx_set_src and tx_set_dest methods were originally implemented to allow
an array of addresses to be passed down from async_xor to the dmaengine
driver while minimizing stack overhead.  Removing these methods allows
drivers to have all transaction parameters available at 'prep' time, saves
two function pointers in struct dma_async_tx_descriptor, and reduces the
number of indirect branches..

A consequence of moving this data to the 'prep' routine is that
multi-source routines like async_xor need temporary storage to convert an
array of linear addresses into an array of dma addresses.  In order to keep
the same stack footprint of the previous implementation the input array is
reused as storage for the dma addresses.  This requires that
sizeof(dma_addr_t) be less than or equal to sizeof(void *).  As a
consequence CONFIG_DMADEVICES now depends on !CONFIG_HIGHMEM64G.  It also
requires that drivers be able to make descriptor resources available when
the 'prep' routine is polled.

Signed-off-by: Dan Williams 
Acked-by: Shannon Nelson

iop-adma: use LIST_HEAD instead of LIST_HEAD_INIT

2008-02-06T17:12:17+00:00

these three list_head are all local variables, but can also use LIST_HEAD.

Signed-off-by: Denis Cheng 
Signed-off-by: Andrew Morton 
Signed-off-by: Dan Williams

DMA: Convert from class_device to device for DMA engine

2008-01-25T04:40:05+00:00

Signed-off-by: Tony Jones 
Signed-off-by: Dan Williams 
Cc: Shannon Nelson 
Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

I/OAT: fix null device in call to dev_err()

2007-12-18T03:28:17+00:00

We can't use the device in a dev_err() after a kzalloc failure or after the
kfree, so simplify it to the pdev that was originally passed in.

Cc: Eric Sesterhenn 
Signed-off-by: Shannon Nelson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

I/OAT: fixups from code comments

2007-12-18T03:28:17+00:00

A few fixups from Andrew's code comments.
  - removed "static inline" forward-declares
  - changed use of min() to min_t()
  - removed some unnecessary NULL initializations
  - removed a couple of BUG() calls

Fixes this:

drivers/dma/ioat_dma.c: In function `ioat1_tx_submit':
drivers/dma/ioat_dma.c:177: sorry, unimplemented: inlining failed in call to '__ioat1_dma_memcpy_issue_pending': function body not available
drivers/dma/ioat_dma.c:268: sorry, unimplemented: called from here

Signed-off-by: Shannon Nelson 
Cc: "Williams, Dan J" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dmaengine: correct invalid assumptions in the Kconfig text

2007-11-29T17:24:53+00:00

This patch corrects recently changed (and now invalid) Kconfig descriptions
for the DMA engine framework:

 - Non-Intel(R) hardware also has DMA engines;
 - DMA is used for more than memcpy and RAID offloading.

In fact, on most platforms memcpy and RAID aren't factors, and DMA
exists so that peripherals can transfer data to/from memory while
the CPU does other work.

Signed-off-by: Haavard Skinnemoen 
Signed-off-by: David Brownell 
Signed-off-by: Dan Williams 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

I/OAT: Add support for version 2 of ioatdma device

2007-11-15T02:45:41+00:00

Add support for version 2 of the ioatdma device.  This device handles
the descriptor chain and DCA services slightly differently:
 - Instead of moving the dma descriptors between a busy and an idle chain,
   this new version uses a single circular chain so that we don't have
   rewrite the next_descriptor pointers as we add new requests, and the
   device doesn't need to re-read the last descriptor.
 - The new device has the DCA tags defined internally instead of needing
   them defined statically.

Signed-off-by: Shannon Nelson 
Cc: "Williams, Dan J" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dmaengine: fix broken device refcounting

2007-11-15T02:45:39+00:00

When a DMA device is unregistered, its reference count is decremented twice
for each channel: Once dma_class_dev_release() and once in
dma_chan_cleanup().  This may result in the DMA device driver's remove()
function completing before all channels have been cleaned up, causing lots
of use-after-free fun.

Fix it by incrementing the device's reference count twice for each
channel during registration.

[dan.j.williams@intel.com: kill unnecessary client refcounting]
Signed-off-by: Haavard Skinnemoen 
Signed-off-by: Dan Williams 
Signed-off-by: Shannon Nelson 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Remove bogus default y for DMAR and NET_DMA

2007-10-30T15:06:55+00:00

No reason I can think of of making them default y Most people don't have
the hardware and with default y they just pollute lots of configs during
make oldconfig.

Signed-off-by: Andi Kleen 
Acked-by: Jeff Garzik 
Acked-by: "Nelson, Shannon" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds