iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
93a40a6d74
linux/drivers/dma
History
Dave Jiang 93a40a6d74 dmaengine: idxd: add percpu_ref to descriptor submission path 
Current submission path has no way to restrict the submitter from
stop submiting on shutdown path or wq disable path. This provides a way to
quiesce the submission path.

Modeling after 'struct reqeust_queue' usage of percpu_ref. One of the
abilities of per_cpu reference counting is the ability to stop new
references from being taken while awaiting outstanding references to be
dropped. On wq shutdown, we want to block any new submissions to the kernel
workqueue and quiesce before disabling. The percpu_ref allows us to block
any new submissions and wait for any current submission calls to finish
submitting to the workqueue.

A percpu_ref is embedded in each idxd_wq context to allow control for
individual wq. The wq->wq_active counter is elevated before calling
movdir64b() or enqcmds() to submit a descriptor to the wq and dropped once
the submission call completes. The function is gated by
percpu_ref_tryget_live(). On shutdown with percpu_ref_kill() called, any
new submission would be blocked from acquiring a ref and failed. Once all
references are dropped for the wq, shutdown can continue.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161894438293.3202472.14894701611500822232.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-04-23 23:08:44 +05:30
..
bestcomm treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
dw dmaengine: dw: Make it dependent to HAS_IOMEM 2021-04-12 14:54:45 +05:30
dw-axi-dmac dmaengine: dw-axi-dmac: remove redundant null check on desc 2021-02-08 17:39:39 +05:30
dw-edma dmaengine: dw-edma: Add pcim_iomap_table return check 2021-03-16 22:58:54 +05:30
fsl-dpaa2-qdma dmaengine: fsl-dpaa2-qdma: remove set but not used variable 'dpaa2_qdma' 2020-03-06 19:04:55 +05:30
hsu dmaengine: hsu: disable spurious interrupt 2021-01-13 22:01:34 +05:30
idxd dmaengine: idxd: add percpu_ref to descriptor submission path 2021-04-23 23:08:44 +05:30
ioat dmaengine: ioatdma: remove unused function missed during dma_v2 removal 2020-11-16 22:42:28 +05:30
ipu dmaengine: ipu_idmac: remove redundant irqsave and restore in hardIRQ 2020-11-09 17:25:53 +05:30
lgm dmaengine: INTEL_LDMA should depend on X86 2021-02-01 11:27:14 +05:30
mediatek dmaengine: mediatek: mtk-hsdma: Fix a resource leak in the error handling path of the probe function 2020-12-29 10:07:59 +05:30
ppc4xx dmaengine: ppc4xx: remove xor_hw_desc assignment without reading 2020-10-30 14:10:27 +05:30
qcom dt-bindings: dmaengine: qcom: gpi: add compatible for sm8150 2021-04-20 15:37:03 +05:30
sf-pdma dmaengine: sf: drop of_match_ptr from of_device_id table 2020-11-24 23:02:20 +05:30
sh dmaengine: rcar-dmac: Add support for R-Car V3U 2021-02-01 11:18:59 +05:30
ti dmaengine updates for v5.12-rc1 2021-02-23 15:05:10 -08:00
xilinx Merge branch 'fixes' into next 2021-04-20 16:43:43 +05:30
acpi-dma.c dmaengine: acpi: Put the CSRT table after using it 2020-08-17 10:21:37 +05:30
altera-msgdma.c dmaengine: altera-msgdma: fix kernel-doc style for tasklet 2020-10-08 15:18:37 +05:30
amba-pl08x.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
at_hdmac_regs.h dmaengine: at_hdmac: remove platform data header 2021-01-08 13:57:19 +05:30
at_hdmac.c dmaengine: at_hdmac: remove platform data header 2021-01-08 13:57:19 +05:30
at_xdmac.c dmaengine: at_xdmac: Remove unused inline function at_xdmac_csize() 2021-04-20 16:02:19 +05:30
bcm2835-dma.c dmaengine: bcm2835: Drop local dma_parms 2020-09-11 17:42:12 +05:30
bcm-sba-raid.c dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member 2020-02-13 20:15:35 +05:30
dma-axi-dmac.c dmaengine: axi-dmac: Drop local dma_parms 2020-09-11 17:42:12 +05:30
dma-jz4780.c dmaengine: jz4780: Add support for the JZ4760(B) 2021-01-26 22:45:22 +05:30
dmaengine.c dmaengine: Fix a double free in dma_async_device_register 2021-04-12 15:05:58 +05:30
dmaengine.h dmaengine: Create debug directories for DMA devices 2020-03-11 14:56:14 +05:30
dmatest.c dmaengine: dmatest: Use dmaengine_get_dma_device 2020-12-11 21:20:08 +05:30
ep93xx_dma.c dmaengine: ep93xx: convert tasklets to use new tasklet_setup() API 2020-09-18 12:18:11 +05:30
fsl_raid.c dmaengine: fsl: remove bad channel update 2020-10-05 09:59:17 +05:30
fsl_raid.h
fsl-edma-common.c dmaengine: fsl-edma: fix wrong tcd endianness for big-endian cpu 2020-07-06 14:49:22 +05:30
fsl-edma-common.h dmaengine: fsl-edma-common: correct DSIZE_32BYTE 2020-07-06 10:24:49 +05:30
fsl-edma.c dmaengine: fsl-edma: Fix NULL pointer exception in fsl_edma_tx_handler 2020-06-24 13:05:01 +05:30
fsl-qdma.c dmaengine: Extend NXP QDMA driver to check transmission errors 2020-07-17 11:50:03 +05:30
fsldma.c dmaengine: fsldma: Fix a resource leak in an error handling path of the probe function 2021-01-12 18:00:39 +05:30
fsldma.h fsldma: fix very broken 32-bit ppc ioread64 functionality 2020-08-29 13:50:56 -07:00
hisi_dma.c dmaengine: hisi_dma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
idma64.c dmaengine: idma64: Switch to use __maybe_unused instead of ifdeffery 2020-11-09 17:21:05 +05:30
idma64.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
img-mdc-dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 422 2019-06-05 17:37:15 +02:00
imx-dma.c dmaengine: imx-dma: Remove unused .id_table 2020-11-24 22:55:07 +05:30
imx-sdma.c dmaengine: imx-sdma: Use of_device_get_match_data() 2021-01-26 22:42:48 +05:30
iop-adma.c Merge branch 'topic/tasklet' into next 2020-10-01 10:18:59 +05:30
iop-adma.h treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
k3dma.c dmaengine: k3dma: use the correct HiSilicon copyright 2021-04-12 17:14:53 +05:30
Kconfig dmaengine: drivers: Kconfig: add HAS_IOMEM dependency to DW_AXI_DMAC 2021-02-01 15:08:15 +05:30
lpc18xx-dmamux.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
Makefile dmaengine: remove coh901318 driver 2021-01-26 22:55:32 +05:30
mcf-edma.c dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler 2020-06-24 13:06:15 +05:30
milbeaut-hdmac.c dmaengine: Replace zero-length array with flexible-array 2020-06-15 23:08:30 -05:00
milbeaut-xdmac.c dmaengine: milbeaut-xdmac: Fix a resource leak in the error handling path of the probe function 2020-12-29 10:08:00 +05:30
mmp_pdma.c dmaengine: mmp_pdma: Remove mmp_pdma_filter_fn() 2021-01-26 22:58:01 +05:30
mmp_tdma.c dmaengine: mmp: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
moxart-dma.c dmaengine: moxart-dma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
mpc512x_dma.c dmaengine: mpc512x: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
mv_xor_v2.c dmaengine: mv_xor_v2: Fix error return code in mv_xor_v2_probe() 2020-11-24 22:55:15 +05:30
mv_xor.c dmaengine: mv_xor: drop of_match_ptr from of_device_id table 2020-11-24 23:02:20 +05:30
mv_xor.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
mxs-dma.c dmaengine: mxs-dma: Remove the unused .id_table 2020-11-24 22:55:15 +05:30
nbpfaxi.c dmaengine: nbpfaxi: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
of-dma.c dmaengine: of-dma: Add support for optional router configuration callback 2020-12-11 21:20:08 +05:30
owl-dma.c dmaengine: owl-dma: Fix a resource leak in the remove function 2021-01-12 18:00:40 +05:30
pch_dma.c dmaengine: pch_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
pl330.c amba: Make the remove callback return void 2021-02-02 14:25:50 +01:00
plx_dma.c dmaengine: plx_dma: add a missing put_device() on error path 2021-04-12 15:13:51 +05:30
pxa_dma.c dmaengine: pxa_dma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
s3c24xx-dma.c dmaengine: s3c24xx-dma: fix spelling mistake "to" -> "too" 2020-01-23 17:03:25 +05:30
sa11x0-dma.c dmaengine: sa11x0: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
sprd-dma.c dmaengine: sprd: Set request pending flag when DMA controller is active 2020-03-23 11:38:24 +05:30
st_fdma.c iov_iter: Move unnecessary inclusion of crypto/hash.h 2020-06-30 09:34:23 -04:00
st_fdma.h
ste_dma40_ll.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
ste_dma40_ll.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
ste_dma40.c dmaengine: stedma40: fix 'physical' typo 2021-01-27 21:13:19 +05:30
stm32-dma.c dmaengine: stm32-dma: take address into account when computing max width 2020-12-11 21:13:08 +05:30
stm32-dmamux.c dmaengine: stm32: mark of_device_id table as maybe unused 2020-11-24 23:02:20 +05:30
stm32-mdma.c dmaengine: stm32-mdma: fix STM32_MDMA_VERY_HIGH_PRIORITY value 2021-01-04 21:27:45 +05:30
sun4i-dma.c dmaengine: sun4i-dma: Demote obvious misuse of kerneldoc to standard comment blocks 2020-07-15 17:50:47 +05:30
sun6i-dma.c dmaengine: sun6i: Add support for A100 DMA 2020-11-18 16:28:49 +05:30
tegra20-apb-dma.c dmaengine: tegra20: Fix runtime PM imbalance on error 2021-04-12 15:10:44 +05:30
tegra210-adma.c dmaengine: tegra210-adma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
timb_dma.c dmaengine: timb_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
TODO
txx9dmac.c dmaengine: txx9dmac: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
txx9dmac.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
uniphier-mdmac.c dmaengine: uniphier-mdmac: replace zero-length array with flexible-array member 2020-02-13 20:15:57 +05:30
uniphier-xdmac.c iov_iter: Move unnecessary inclusion of crypto/hash.h 2020-06-30 09:34:23 -04:00
virt-dma.c dmaengine: virt-dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
virt-dma.h dmaengine: virt-dma: Add missing locking around list operations 2019-12-26 10:04:18 +05:30
xgene-dma.c dmaengine: xgene: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30