Hi Haren, If I understand correctly, to test these, I need to apply both this series and your VAS userspace page fault handling series - is that right? Kind regards, Daniel > Power9 processor supports Virtual Accelerator Switchboard (VAS) which > allows kernel and userspace to send compression requests to Nest > Accelerator (NX) directly. The NX unit comprises of 2 842 compression > engines and 1 GZIP engine. Linux kernel already has 842 compression > support on kernel. This patch series adds GZIP compression support > from user space. The GZIP Compression engine implements the ZLIB and > GZIP compression algorithms. No plans of adding NX-GZIP compression > support in kernel right now. > > Applications can send requests to NX directly with COPY/PASTE > instructions. But kernel has to establish channel / window on NX-GZIP > device for the userspace. So userspace access to the GZIP engine is > provided through /dev/crypto/nx-gzip device with several operations. > > An application must open the this device to obtain a file descriptor (fd). > Using the fd, application should issue the VAS_TX_WIN_OPEN ioctl to > establish a connection to the engine. Once window is opened, should use > mmap() system call to map the hardware address of engine's request queue > into the application's virtual address space. Then user space forms the > request as co-processor Request Block (CRB) and paste this CRB on the > mapped HW address using COPY/PASTE instructions. Application can poll > on status flags (part of CRB) with timeout for request completion. > > For VAS_TX_WIN_OPEN ioctl, if user space passes vas_id = -1 (struct > vas_tx_win_open_attr), kernel determines the VAS instance on the > corresponding chip based on the CPU on which the process is executing. > Otherwise, the specified VAS instance is used if application passes the > proper VAS instance (vas_id listed in /proc/device-tree/vas@*/ibm,vas_id). > > Process can open multiple windows with different FDs or can send several > requests to NX on the same window at the same time. > > A userspace library libnxz is available: > https://github.com/abalib/power-gzip > > Applications that use inflate/deflate calls can link with libNXz and use > NX GZIP compression without any modification. > > Tested the available 842 compression on power8 and power9 system to make > sure no regression and tested GZIP compression on power9 with tests > available in the above link. > > Thanks to Bulent Abali for nxz library and tests development. > > Changelog: > V2: > - Move user space API code to powerpc as suggested. Also this API > can be extended to any other coprocessor type that VAS can support > in future. Example: Fast thread wakeup feature from VAS > - Rebased to 5.6-rc3 > > V3: > - Fix sparse warnings (patches 3&6) > > Haren Myneni (9): > powerpc/vas: Initialize window attributes for GZIP coprocessor type > powerpc/vas: Define VAS_TX_WIN_OPEN ioctl API > powerpc/vas: Add VAS user space API > crypto/nx: Initialize coproc entry with kzalloc > crypto/nx: Rename nx-842-powernv file name to nx-common-powernv > crypto/NX: Make enable code generic to add new GZIP compression type > crypto/nx: Enable and setup GZIP compresstion type > crypto/nx: Remove 'pid' in vas_tx_win_attr struct > Documentation/powerpc: VAS API > > Documentation/powerpc/index.rst | 1 + > Documentation/powerpc/vas-api.rst | 246 +++++ > Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + > arch/powerpc/include/asm/vas.h | 12 +- > arch/powerpc/include/uapi/asm/vas-api.h | 22 + > arch/powerpc/platforms/powernv/Makefile | 2 +- > arch/powerpc/platforms/powernv/vas-api.c | 290 +++++ > arch/powerpc/platforms/powernv/vas-window.c | 23 +- > arch/powerpc/platforms/powernv/vas.h | 2 + > drivers/crypto/nx/Makefile | 2 +- > drivers/crypto/nx/nx-842-powernv.c | 1062 ------------------ > drivers/crypto/nx/nx-common-powernv.c | 1133 ++++++++++++++++++++ > 12 files changed, 1723 insertions(+), 1073 deletions(-) > create mode 100644 Documentation/powerpc/vas-api.rst > create mode 100644 arch/powerpc/include/uapi/asm/vas-api.h > create mode 100644 arch/powerpc/platforms/powernv/vas-api.c > delete mode 100644 drivers/crypto/nx/nx-842-powernv.c > create mode 100644 drivers/crypto/nx/nx-common-powernv.c > > -- > 1.8.3.1
