ChangeLog: ========= v2 => v3: a) MIC bus device private pointer cleanup as per feedback from Greg Kroah-Hartman. b) Fixed minor Makefile conflict after rebasing to v3.16-rc2 v1 => v2: https://lkml.org/lkml/2014/5/29/981 a) MIC bus driver cleanups and device release callback fix in patch 2, as per feedback from Greg Kroah-Hartman. v1: Initial post @ https://lkml.org/lkml/2014/5/27/819 These patches are being sent to char-misc because there is a dependency between the patches for dma driver and other drivers. Description: ============ This set of patches add support for MIC X100 dma driver. MIC PCIe card has a dma controller with 8 channels. These channels are shared between the host s/w and the card s/w. 0 to 3 are used by host nd 4 to 7 by card. As the dma device doesn't show up as PCIe device, a virtual bus called mic bus is created and virtual dma devices are created on it by the host/card drivers. On host the channels are private and used only by the host driver to transfer data for the virtio devices. Here is a higher level block diagram. | +----------+ | +----------+ | Card OS | | | Host OS | +----------+ | +----------+ | +-------+ +--------+ +------+ | +---------+ +--------+ +--------+ | Virtio| |Virtio | |Virtio| | |Virtio | |Virtio | |Virtio | | Net | |Console | |Block | | |Net | |Console | |Block | | Driver| |Driver | |Driver| | |backend | |backend | |backend | +-------+ +--------+ +------+ | +---------+ +--------+ +--------+ | | | | | | | | | | |User | | | | | | |------|------------|---------|------- +-------------------+ |Kernel +--------------------------+ | | | Virtio over PCIe IOCTLs | | | +--------------------------+ +-----------+ | | | +-----------+ | MIC DMA | | | | | MIC DMA | | Driver | | | | | Driver | +-----------+ | | | +-----------+ | | | | | +---------------+ | | | +----------------+ |MIC virtual Bus| | | | |MIC virtual Bus | +---------------+ | | | +----------------+ | | | | | | +--------------+ | +---------------+ | | |Intel MIC | | |Intel MIC | | +---|Card Driver | | |Host Driver | | +--------------+ | +---------------+-----+ | | | +-------------------------------------------------------------+ | | | PCIe Bus | +-------------------------------------------------------------+ The following series of patches are partitioned as follows: Patch 1: Add mic bus and dma driver documentation. Patch 2: Add a bus driver for virtual MIC devices. Patch 3: MIC X100 DMA Driver. Patch 4: Add threaded irq support in host driver. This is needed as the dma driver uses threaded irq. Patch 5: Use dma to transfer data between MIC and host. Authors: Siva Yerramreddy, Ashutosh Dixit Patch 6: Add threaded irq support in mic_request_card_irq. This is needed as the dma driver uses threaded irq. Patch 7: Add dma device on mic bus. Patch 8: Modify the mpss script to load/unload mic_x100_dma.ko. The patches have been compiled/validated against v3.16-rc2. Tested using dmatest module with module parameter "threads_per_chan=60". These patches have also been scanned by Fengguang Wu's 0-day infrastructure and no issues have been reported. Thanks to Dan Williams, Vinod Koul, Jon Mason, Dave Jiang for the initial review. Siva Yerramreddy (7): misc: mic: Add mic bus and dma driver documentation dma: MIC X100 DMA Driver misc: mic: add threaded irq support in host driver misc: mic: add dma support in host driver misc: mic: add threaded irq support in card driver misc: mic: add dma support in card driver misc: mic: add support for loading/unloading dma driver Sudeep Dutt (1): misc: mic: add a bus driver for virtual MIC devices Documentation/mic/mic_overview.txt | 67 ++-- Documentation/mic/mpssd/mpss | 14 +- drivers/dma/Kconfig | 19 + drivers/dma/Makefile | 1 + drivers/dma/mic_x100_dma.c | 774 +++++++++++++++++++++++++++++++++++++ drivers/dma/mic_x100_dma.h | 286 ++++++++++++++ drivers/misc/mic/Kconfig | 21 +- drivers/misc/mic/Makefile | 1 + drivers/misc/mic/bus/Makefile | 5 + drivers/misc/mic/bus/mic_bus.c | 218 +++++++++++ drivers/misc/mic/card/mic_device.c | 23 +- drivers/misc/mic/card/mic_device.h | 9 +- drivers/misc/mic/card/mic_virtio.c | 7 +- drivers/misc/mic/card/mic_x100.c | 55 ++- drivers/misc/mic/host/mic_boot.c | 83 +++- drivers/misc/mic/host/mic_device.h | 24 ++ drivers/misc/mic/host/mic_intr.c | 121 +++--- drivers/misc/mic/host/mic_intr.h | 27 +- drivers/misc/mic/host/mic_main.c | 5 +- drivers/misc/mic/host/mic_virtio.c | 187 +++++++-- drivers/misc/mic/host/mic_virtio.h | 21 +- drivers/misc/mic/host/mic_x100.c | 8 + include/linux/mic_bus.h | 110 ++++++ 23 files changed, 1935 insertions(+), 151 deletions(-) create mode 100644 drivers/dma/mic_x100_dma.c create mode 100644 drivers/dma/mic_x100_dma.h create mode 100644 drivers/misc/mic/bus/Makefile create mode 100644 drivers/misc/mic/bus/mic_bus.c create mode 100644 include/linux/mic_bus.h -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
