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b9855f03d5
linux_dsm_epyc7002/drivers/dma
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Robert Jarzmik b9855f03d5 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_ACK flag is set in the
transfer.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-06-17 22:15:59 +05:30
..
bestcomm dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
dw Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
hsu dmaengine: hsu: don't prompt for hsu_core part 2015-04-22 09:28:32 -07:00
ioat Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
ipu dmaengine: ipu-idmac: Split device_control 2014-12-22 12:28:59 +05:30
ppc4xx dmaengine: Remove FSF mailing addresses 2015-03-16 22:28:15 +05:30
sh dmaengine: usb-dmac: Protect PM-only functions to kill warning 2015-04-27 08:36:02 +05:30
xilinx dmaengine: xilinx-dma: move header file to common location 2015-03-17 16:23:21 +05:30
acpi-dma.c resources: Move struct resource_list_entry from ACPI into resource core 2015-02-05 15:09:25 +01:00
amba-pl08x.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
at_hdmac_regs.h dmaengine: at_hdmac: Fix calculation of the residual bytes 2015-03-13 14:58:31 +05:30
at_hdmac.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
at_xdmac.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
bcm2835-dma.c dmaengine: bcm2835-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
coh901318_lli.c Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2013-02-26 09:24:48 -08:00
coh901318.c dmaengine: coh901318: fix function return types build warnings 2015-01-18 20:01:36 +05:30
coh901318.h dma: coh901318: merge header files 2013-01-07 17:36:37 +01:00
cppi41.c dmaengine: cppi41: add missing bitfields 2015-04-11 21:12:58 +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: add driver for the Ingenic JZ4780 DMA controller 2015-04-01 08:43:49 +05:30
dmaengine.c dmaengine: increment privatecnt when using dma_get_any_slave_channel 2015-04-29 16:47:57 +05:30
dmaengine.h dmaengine: consolidate initialization of cookies 2012-03-13 11:37:22 +05:30
dmatest.c dmatest: move src_off, dst_off, len inside loop 2015-02-04 18:17:21 -08:00
edma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
ep93xx_dma.c dmaengine: ep93xx: update the driver comments 2014-12-22 20:27:25 +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
fsl-edma.c dmaengine: fsl-edma: Declare slave capabilities for the generic code 2014-12-22 12:33:23 +05:30
fsldma.c dmaengine: fsldma: remove the unused variable 2015-01-13 23:58:08 +05:30
fsldma.h dmaengine: fsldma: declare slave capabilities for the generic code 2015-01-13 23:58:08 +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 Merge branch 'topic/slave_caps_device_control_fix_rebased' into for-linus 2015-02-02 16:55:35 -08:00
imx-sdma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
iop-adma.c dmaengine: Remove FSF mailing addresses 2015-03-16 22:28:15 +05:30
k3dma.c Merge branch 'topic/alloc_removal' into for-linus 2015-03-18 22:46:19 +05:30
Kconfig dmaengine: xgene: Set hardware dependency 2015-04-27 08:36:02 +05:30
Makefile Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
mic_x100_dma.c dma: MIC X100 DMA Driver 2014-07-12 09:57:42 -07:00
mic_x100_dma.h dma: MIC X100 DMA Driver 2014-07-12 09:57:42 -07:00
mmp_pdma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
mmp_tdma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
moxart-dma.c dmaengine: moxart-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
mpc512x_dma.c dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
mv_xor.c dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
mv_xor.h dmaengine: Remove FSF mailing addresses 2015-03-16 22:28:15 +05:30
mxs-dma.c dmaengine: mxs-dma: Declare slave capabilities for the generic code 2015-01-13 23:48:40 +05:30
nbpfaxi.c dmaengine: nbpfaxi: update the driver comments 2014-12-22 20:28:04 +05:30
of-dma.c dmaengine: export symbol of of_dma_request_slave_channel() 2015-03-07 15:03:13 +00:00
omap-dma.c dmaengine: omap-dma: Fix memory leak when terminating running transfer 2015-03-30 23:17:08 +05:30
pch_dma.c dmaengine: pch_dma: fix memory leak on failure path in pch_dma_probe() 2015-04-17 23:41:46 +05:30
pl330.c dmaengine: pl330: fix return status on pending transfers 2015-03-18 22:41:49 +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: remove device_alloc_chan_resources handler 2015-03-18 22:45:36 +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: constify of_device_id array 2015-03-18 22:13:14 +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
ste_dma40.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
sun6i-dma.c Merge branch 'topic/alloc_removal' into for-linus 2015-03-18 22:46:19 +05:30
tegra20-apb-dma.c dmaengine: tegra: add slave capabilities reporting 2015-01-14 00:00:30 +05:30
timb_dma.c dmaengine: td: Rename device_control 2014-12-22 12:33:22 +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 2015-06-17 22:15:59 +05:30
virt-dma.h dmaengine: virt-dma: don't always free descriptor upon completion 2015-06-17 22:15:59 +05:30
xgene-dma.c dmaengine: fix platform_no_drv_owner.cocci warnings 2015-04-17 23:43:18 +05:30