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remarkable-linux/drivers/dma
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Robert Jarzmik 13bb26ae88 dmaengine: virt-dma: don't always free descriptor upon completion 
This patch attempts to enhance the case of a transfer submitted multiple
times, and where the cost of creating the descriptors chain is not
negligible.

This happens with big video buffers (several megabytes, ie. several
thousands of linked descriptors in one scatter-gather list). In these
cases, a video driver would want to do :
 - tx = dmaengine_prep_slave_sg()
 - dma_engine_submit(tx);
 - dma_async_issue_pending()
 - wait for video completion
 - read video data (or not, skipping a frame is also possible)
 - dma_engine_submit(tx)
   => here, the descriptors chain recalculation will take time
   => the dma coherent allocation over and over might create holes in
      the dma pool, which is counter-productive.
 - dma_async_issue_pending()
 - etc ...

In order to cope with this case, virt-dma is modified to prevent freeing
the descriptors upon completion if DMA_CTRL_REUSE flag is set in the
transfer.

This patch is a respin of the former DMA_CTRL_ACK approach, which was
reverted due to a regression in audio drivers.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-11-16 08:32:16 +05:30
..
bestcomm dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
dw dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
hsu dmaengine: hsu: remove platform data 2015-10-17 21:22:08 -07:00
ioat dmaengine: ioatdma: add PCIe AER handlers 2015-09-21 21:10:05 +05:30
ipu genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
ppc4xx dmaengine: Remove FSF mailing addresses 2015-03-16 22:28:15 +05:30
sh dmaengine: sort the sh Makefile 2015-08-26 07:50:17 +05:30
xilinx dmaengine: xilinx: Fix module autoload for OF platform driver 2015-10-01 07:35:39 +05:30
acpi-dma.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
amba-pl08x.c dmaengine: pl08x: support dt channel assignment 2015-08-18 22:12:14 +05:30
at_hdmac.c dmaengine: hdmac: Add scatter-gathered memset support 2015-10-29 10:41:16 +09:00
at_hdmac_regs.h dmaengine: hdmac: factorise memset descriptor allocation 2015-10-29 10:40:09 +09:00
at_xdmac.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
bcm2835-dma.c dmaengine: bcm2835-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
coh901318.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
coh901318.h dma: coh901318: merge header files 2013-01-07 17:36:37 +01:00
coh901318_lli.c Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2013-02-26 09:24:48 -08:00
cppi41.c dmaengine: cppi41: add missing bitfields 2015-04-11 21:12:58 +05:30
dma-axi-dmac.c dmaengine: Add support for the Analog Devices AXI-DMAC DMA controller 2015-08-23 18:55:10 +05:30
dma-jz4740.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
dma-jz4780.c dmaengine: jz4780: Kill tasklets before unregistering the device 2015-08-18 22:28:50 +05:30
dmaengine.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
dmaengine.h dmaengine: consolidate initialization of cookies 2012-03-13 11:37:22 +05:30
dmatest.c kernel/params: constify struct kernel_param_ops uses 2015-05-28 11:32:10 +09:30
edma.c dmaengine: edma: Add dummy driver skeleton for edma3-tptc 2015-11-04 22:11:42 +05:30
ep93xx_dma.c dmaengine: ep93xx: Constify platform_device_id 2015-05-04 16:38:55 +05:30
fsl-edma.c dmaengine: fsl-edma: clear pending interrupts on initialization 2015-06-25 09:22:32 +05:30
fsl_raid.c dmaengine: fsl_raid: statify fsl_re_chan_probe 2015-04-02 16:11:35 +05:30
fsl_raid.h dmaengine: Driver support for FSL RaidEngine device. 2015-04-02 16:10:27 +05:30
fsldma.c dmaengine: fsldma: Fix module autoload for OF platform driver 2015-10-01 07:34:31 +05:30
fsldma.h dmaengine: fsldma: declare slave capabilities for the generic code 2015-01-13 23:58:08 +05:30
idma64.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
idma64.h dmaengine: idma64: use lo_hi_readq() / lo_hi_writeq() 2015-09-25 07:54:05 +05:30
img-mdc-dma.c dmaengine: img-mdc: remove device_alloc_chan_resources handler 2015-03-18 22:44:58 +05:30
imx-dma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
imx-sdma.c dmaengine: imx-sdma: Remove unneeded dev_info() 2015-10-07 15:03:08 +01:00
iop-adma.c drivers/dma/iop-adma: Use dma_alloc_writecombine() kernel-style 2015-08-25 09:59:46 +02:00
k3dma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
Kconfig Merge branch 'topic/idma' into for-linus 2015-10-31 07:37:05 +05:30
lpc18xx-dmamux.c dmaengine: add driver for lpc18xx dmamux 2015-08-18 22:12:14 +05:30
Makefile dmaengine: idma: rename to INTEL_IDMA64 2015-09-24 20:55:58 +05:30
mic_x100_dma.c dma: Add support to program MIC x100 status descriptiors 2015-10-04 12:46:06 +01:00
mic_x100_dma.h dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
mmp_pdma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
mmp_tdma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
moxart-dma.c dmaengine: moxart-dma: Fix module autoload for OF platform driver 2015-10-01 07:34:31 +05:30
mpc512x_dma.c dmaengine: mpc512x: Fix module autoload for OF platform driver 2015-10-01 07:34:31 +05:30
mv_xor.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
mv_xor.h dmaengine: mv_xor: improve descriptors list handling and reduce locking 2015-06-10 22:18:31 +05:30
mxs-dma.c dmaengine: mxs: Constify platform_device_id 2015-05-04 16:38:55 +05:30
nbpfaxi.c dmaengine: nbpfaxi: Constify platform_device_id 2015-05-04 16:38:55 +05:30
of-dma.c dmaengine: of_dma: Support for DMA routers 2015-05-09 17:11:25 +05:30
omap-dma.c dmaengine: omap-dma: Enable packed accesses for cyclic transfers 2015-10-05 16:31:34 +01:00
pch_dma.c dmaengine: Remove remaining FSF mailing addresses 2015-07-06 19:18:53 +05:30
pl330.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
pxa_dma.c dmaengine: pxa_dma: fix residue corner case 2015-10-01 07:44:31 +05:30
qcom_bam_dma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
s3c24xx-dma.c dmaengine: s3c24xx: Constify platform_device_id 2015-05-04 16:38:55 +05:30
sa11x0-dma.c dmaengine: sa11x0: report slave capabilities to upper layers 2015-04-17 23:24:35 +05:30
sirf-dma.c dmaengine: sirf: Fix module autoload for OF platform driver 2015-10-01 07:34:31 +05:30
ste_dma40.c dmaengine: ste_dma40: fix a trivial typo 2015-10-25 04:15:40 +05:30
ste_dma40_ll.c dmaengine: ste_dma40_ll: Replace meaningless register set with comment 2013-06-04 11:12:10 +02:00
ste_dma40_ll.h dmaengine: ste_dma40: Remove unnecessary call to d40_phy_cfg() 2013-05-23 21:13:19 +02:00
sun4i-dma.c dmaengine: sun4i: fix unsafe list iteration 2015-09-30 12:17:22 +05:30
sun6i-dma.c dmaengine: sun6i: Fix module autoload for OF platform driver 2015-10-01 07:35:26 +05:30
tegra20-apb-dma.c dmaengine: tegra-apb: Simplify locking for device using global pause 2015-08-20 12:10:25 +05:30
ti-dma-crossbar.c dmaengine: ti-dma-crossbar: Add support for crossbar on AM33xx/AM43xx 2015-10-27 10:22:45 +09:00
timb_dma.c dmaengine: Remove remaining FSF mailing addresses 2015-07-06 19:18:53 +05:30
TODO dmaengine: dw: don't perform DMA when dmaengine_submit is called 2014-07-15 22:14:30 +05:30
txx9dmac.c dmaengine: txx9: Rename device_control 2014-12-22 12:33:22 +05:30
txx9dmac.h MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT 2014-11-24 22:46:44 +01:00
virt-dma.c dmaengine: virt-dma: don't always free descriptor upon completion 2015-11-16 08:32:16 +05:30
virt-dma.h dmaengine: virt-dma: don't always free descriptor upon completion 2015-11-16 08:32:16 +05:30
xgene-dma.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
zx296702_dma.c dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00