dmaengine from the beginning has placed the burden of unmapping dma
buffers on the individual drivers. The thought being that since the dma
driver already has the descriptor it can use that information for
unmapping. This results in a lot of cruft to read back data from
descriptors, places a burden on channels that need to break up an
operation internally into multiple descriptors, and makes it difficult
to have dma mappings with different lifetimes than the current
operation.
For example an xor->copy->xor chain wants to leave all buffers
mapped until completion, async_tx currently performs invalid overlapping
mappings. With dmaengine_unmap_data map once and take a reference for
descriptor that uses the mapping.
Thanks to Bart for getting this cleanup started!
I'll also push this out to the 'unmap' branch:
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/dmaengine unmap
--
Dan
---
Bartlomiej Zolnierkiewicz (2):
dmaengine: remove DMA unmap from drivers
dmaengine: remove DMA unmap flags
Dan Williams (10):
dmaengine: consolidate memcpy apis
dmaengine: prepare for generic 'unmap' data
dmaengine: reference counted unmap data
async_memcpy: convert to dmaengine_unmap_data
async_memset: convert to dmaengine_unmap_data
async_xor: convert to dmaengine_unmap_data
async_xor_val: convert to dmaengine_unmap_data
async_raid6_recov: convert to dmaengine_unmap_data
async_pq: convert to dmaengine_unmap_data
async_pq_val: convert to dmaengine_unmap_data
arch/arm/include/asm/hardware/iop3xx-adma.h | 30 ---
arch/arm/include/asm/hardware/iop_adma.h | 4
arch/arm/mach-iop13xx/include/mach/adma.h | 26 ---
crypto/async_tx/async_memcpy.c | 36 ++--
crypto/async_tx/async_memset.c | 15 +-
crypto/async_tx/async_pq.c | 174 ++++++++++-------
crypto/async_tx/async_raid6_recov.c | 61 ++++--
crypto/async_tx/async_xor.c | 122 +++++++-----
drivers/ata/pata_arasan_cf.c | 3
drivers/dma/amba-pl08x.c | 32 ---
drivers/dma/at_hdmac.c | 26 ---
drivers/dma/dmaengine.c | 261 ++++++++++++++++++--------
drivers/dma/dmatest.c | 3
drivers/dma/dw_dmac.c | 21 --
drivers/dma/ep93xx_dma.c | 30 ---
drivers/dma/fsldma.c | 17 --
drivers/dma/ioat/dma.c | 20 --
drivers/dma/ioat/dma.h | 12 -
drivers/dma/ioat/dma_v2.c | 2
drivers/dma/ioat/dma_v3.c | 143 +-------------
drivers/dma/iop-adma.c | 99 ----------
drivers/dma/mv_xor.c | 46 -----
drivers/dma/ppc4xx/adma.c | 270 ---------------------------
drivers/dma/timb_dma.c | 37 ----
drivers/dma/txx9dmac.c | 25 ---
drivers/media/platform/m2m-deinterlace.c | 3
drivers/media/platform/timblogiw.c | 2
drivers/misc/carma/carma-fpga.c | 3
drivers/mtd/nand/atmel_nand.c | 3
drivers/mtd/nand/fsmc_nand.c | 2
drivers/net/ethernet/micrel/ks8842.c | 6 -
drivers/spi/spi-dw-mid.c | 4
include/linux/dmaengine.h | 49 ++++-
33 files changed, 481 insertions(+), 1106 deletions(-)
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