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dmaengine: idxd: Init and probe for Intel data accelerators 

commit bfe1d56091 upstream.

The idxd driver introduces the Intel Data Stream Accelerator [1] that will
be available on future Intel Xeon CPUs. One of the kernel access
point for the driver is through the dmaengine subsystem. It will initially
provide the DMA copy service to the kernel.

Some of the main functionality introduced with this accelerator
are: shared virtual memory (SVM) support, and descriptor submission using
Intel CPU instructions movdir64b and enqcmds. There will be additional
accelerator devices that share the same driver with variations to
capabilities.

This commit introduces the probe and initialization component of the
driver.

[1]: https://software.intel.com/en-us/download/intel-data-streaming-accelerator-preliminary-architecture-specification

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965023991.73301.6186843973135311580.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Chen Zhuo <sagazchen@tencent.com>
Signed-off-by: Xinghui Li <korantli@tencent.com>
This commit is contained in:
Dave Jiang 2020-01-21 16:43:59 -07:00 committed by Jianping Liu
parent 3360f41ec1
commit 7fc251da32
3 changed files with 22 additions and 0 deletions
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8
MAINTAINERS
View File

@ -8283,6 +8283,14 @@ Q: https://patchwork.kernel.org/project/linux-dmaengine/list/
S: Supported
F: drivers/dma/ioat*
INTEL IADX DRIVER
M: Dave Jiang <dave.jiang@intel.com>
L: dmaengine@vger.kernel.org
S: Supported
F: drivers/dma/idxd/*
F: include/uapi/linux/idxd.h
F: include/linux/idxd.h
INTEL IDLE DRIVER
M: Jacob Pan <jacob.jun.pan@linux.intel.com>
M: Len Brown <lenb@kernel.org>

13
drivers/dma/Kconfig
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@ -273,6 +273,19 @@ config INTEL_IDMA64
Enable DMA support for Intel Low Power Subsystem such as found on
Intel Skylake PCH.
config INTEL_IDXD
tristate "Intel Data Accelerators support"
depends on PCI && X86_64
select DMA_ENGINE
select SBITMAP
help
Enable support for the Intel(R) data accelerators present
in Intel Xeon CPU.
Say Y if you have such a platform.
If unsure, say N.
config INTEL_IOATDMA
tristate "Intel I/OAT DMA support"
depends on PCI && X86_64

1
drivers/dma/Makefile
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@ -41,6 +41,7 @@ obj-$(CONFIG_IMX_DMA) += imx-dma.o
obj-$(CONFIG_IMX_SDMA) += imx-sdma.o
obj-$(CONFIG_INTEL_IDMA64) += idma64.o
obj-$(CONFIG_INTEL_IOATDMA) += ioat/
obj-$(CONFIG_INTEL_IDXD) += idxd/
obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o
obj-$(CONFIG_K3_DMA) += k3dma.o