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c40bd7d973
linux/drivers/dma
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Dave Jiang c40bd7d973 dmaengine: idxd: process user page faults for completion record 
DSA supports page fault handling through PRS. However, the DMA engine
that's processing the descriptor is blocked until the PRS response is
received. Other workqueues sharing the engine are also blocked.
Page fault handing by the driver with PRS disabled can be used to
mitigate the stalling.

With PRS disabled while ATS remain enabled, DSA handles page faults on
a completion record by reporting an event in the event log. In this
instance, the descriptor is completed and the event log contains the
completion record address and the contents of the completion record. Add
support to the event log handling code to fault in the completion record
and copy the content of the completion record to user memory.

A bitmap is introduced to keep track of discarded event log entries. When
the user process initiates ->release() of the char device, it no longer is
interested in any remaining event log entries tied to the relevant wq and
PASID. The driver will mark the event log entry index in the bitmap. Upon
encountering the entries during processing, the event log handler will just
clear the bitmap bit and skip the entry rather than attempt to process the
event log entry.

Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20230407203143.2189681-10-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2023-04-12 23:18:45 +05:30
..
bestcomm dmaengine: bestcomm: Use of_address_to_resource() 2023-03-31 18:17:06 +05:30
dw dmaengine: dw: Move check for paused channel to dwc_get_residue() 2023-02-16 18:45:48 +05:30
dw-axi-dmac dmaengine: dw-axi-dmac: Increase polling time to DMA transmission completion status 2023-04-12 23:18:43 +05:30
dw-edma dmaengine: dw-edma: Fix to enable to issue dma request on DMA processing 2023-04-12 22:44:49 +05:30
fsl-dpaa2-qdma dmaengine: fsl-dpaa2-qdma: Drop comma after SoC match table sentinel 2022-03-11 15:47:39 +05:30
hsu dmaengine: hsu: Include headers we are direct user of 2022-09-04 22:49:35 +05:30
idxd dmaengine: idxd: process user page faults for completion record 2023-04-12 23:18:45 +05:30
ioat dmaengine: ioat: Drop redundant pci_enable_pcie_error_reporting() 2023-03-17 23:16:47 +05:30
ipu dmaengine: ipu: Fix fall-through warning for Clang 2021-07-13 14:38:47 -05:00
lgm dmaengine: lgm: Move DT parsing after initialization 2023-01-18 15:32:16 +05:30
mediatek dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
ppc4xx dmaengine: ppc4xx: Convert to use sysfs_emit()/sysfs_emit_at() APIs 2023-01-18 17:43:47 +05:30
ptdma dmaengine updates for v6.3 2023-02-24 17:18:54 -08:00
qcom dmaengine: qcom_hidma: Add explicit platform_device.h and of_device.h includes 2023-04-12 22:43:08 +05:30
sf-pdma dmaengine: sf-pdma: pdma_desc memory leak fix 2023-02-16 18:45:48 +05:30
sh dmaengine: sh: rz-dmac: Remove unused rz_dmac_chan.*_word_size 2023-03-31 17:30:40 +05:30
ti dmaengine: ti: k3-psil: Add PSI-L thread support for J784s4 2023-03-31 18:17:06 +05:30
xilinx dmaengine: zynqmp_dma: Sync DMA and coherent masks 2023-03-31 17:54:02 +05:30
acpi-dma.c dmaengine: acpi: Check for errors from acpi_register_gsi() separately 2021-08-06 21:48:11 +05:30
altera-msgdma.c dmaengine: altera-msgdma: Fixed some inconsistent function name descriptions 2022-07-06 22:00:06 +05:30
amba-pl08x.c dmaengine: pl08x: Fix double word 2022-09-29 12:24:16 +05:30
apple-admac.c Merge branch 'fixes' into next 2022-11-11 12:14:26 +05:30
at_hdmac.c dmaengine: at_hdmac: Convert driver to use virt-dma 2022-11-11 12:15:09 +05:30
at_xdmac.c dmaengine: at_xdmac: align declaration of ret with the rest of variables 2023-04-12 23:18:44 +05:30
bcm2835-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
bcm-sba-raid.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_30.RULE (part 2) 2022-06-10 14:51:35 +02:00
dma-axi-dmac.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
dma-jz4780.c dmaengine: JZ4780: Add support for the JZ4755. 2022-10-19 19:13:16 +05:30
dmaengine.c dmaengine updates for v6.3 2023-02-24 17:18:54 -08:00
dmaengine.h dmaengine: dmaengine_desc_callback_valid(): Check for callback_result 2021-10-25 09:42:56 +05:30
dmatest.c treewide: use get_random_bytes() when possible 2022-10-11 17:42:58 -06:00
ep93xx_dma.c dmaengine: ep93xx: Fix typo in comments 2022-07-01 21:50:23 +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: remove redundant assignment to pointer last_sg 2022-07-01 22:09:16 +05:30
fsl-edma-common.h dmaengine: fsl-edma: support edma memcpy 2021-10-28 22:56:24 +05:30
fsl-edma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
fsl-qdma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +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: hisilicon: Dump regs to debugfs 2022-09-04 22:42:35 +05:30
idma64.c dmaengine: idma64: Update bytes_transferred field 2023-02-16 18:45:48 +05:30
idma64.h
img-mdc-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
imx-dma.c dmaengine: imx-dma: Remove a redundant memset() call 2023-03-17 23:10:46 +05:30
imx-sdma.c dmaengine updates for v6.3 2023-02-24 17:18:54 -08:00
k3dma.c dmaengine: k3dma: use the correct HiSilicon copyright 2021-04-12 17:14:53 +05:30
Kconfig dmaengine: tegra: explicitly select DMA_VIRTUAL_CHANNELS 2023-03-31 13:33:50 +05:30
lpc18xx-dmamux.c
Makefile dmaengine: remove s3c24xx driver 2023-01-16 09:26:06 +01:00
mcf-edma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
milbeaut-hdmac.c dmaengine: milbeaut-hdmac: Prefer kcalloc over open coded arithmetic 2021-10-25 12:12:13 +05:30
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: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
mmp_tdma.c dmaengine updates for v6.3 2023-02-24 17:18:54 -08:00
moxart-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
mpc512x_dma.c dmaengine: mpc512x: Fix fall-through warning for Clang 2021-07-14 11:05:55 -05:00
mv_xor_v2.c dmaengine: mv_xor_v2: Use some clk_ helper functions to simplify code 2023-03-31 17:23:02 +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
mxs-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
nbpfaxi.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
of-dma.c dmaengine: Use of_property_present() for testing DT property presence 2023-03-17 23:11:42 +05:30
owl-dma.c dmaengine: owl: fix typo in comment 2022-07-06 10:50:43 +05:30
pch_dma.c dmaengine: pch_dma: Remove usage of the deprecated "pci-dma-compat.h" API 2022-01-08 22:16:44 +05:30
pl330.c dmaengine: pl330: Remove unused flags 2022-09-05 12:01:54 +05:30
plx_dma.c dmaengine: plx_dma: Move spin_lock_bh() to spin_lock() 2022-04-20 15:59:33 +05:30
pxa_dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
sa11x0-dma.c dmaengine: sa11x0: Mark PM functions as __maybe_unused 2021-10-26 10:55:07 +05:30
sprd-dma.c dmaengine: sprd: Cleanup in .remove() after pm_runtime_get_sync() failed 2022-07-26 18:20:49 +05:30
st_fdma.c dmaengine: st_fdma: fix MODULE_ALIAS 2021-12-13 13:18:48 +05:30
st_fdma.h
ste_dma40_ll.c
ste_dma40_ll.h
ste_dma40.c dmaengine: ste_dma40: fix typo in comment 2022-07-06 10:54:08 +05:30
stm32-dma.c dmaengine: stm32-dma: fix potential race between pause and resume 2022-11-08 10:43:56 +05:30
stm32-dmamux.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
stm32-mdma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
sun4i-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
sun6i-dma.c dmaengine: drivers: Use devm_platform_ioremap_resource() 2023-01-18 22:16:47 +05:30
tegra20-apb-dma.c dmaengine: tegra-apb: remove unused tdma_read function 2023-03-31 17:51:15 +05:30
tegra186-gpc-dma.c dmaengine: tegra: Fix memory leak in terminate_all() 2023-01-18 22:18:38 +05:30
tegra210-adma.c dmaengine updates for v6.3 2023-02-24 17:18:54 -08:00
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
uniphier-mdmac.c
uniphier-xdmac.c dmaengine: uniphier-xdmac: Fix type of address variables 2022-01-03 17:49:37 +05:30
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
xgene-dma.c dmaengine: xgene: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30