On Tue, 2020-03-17 at 00:04 +1100, Daniel Axtens wrote: > 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? Daniel, Yes, This patch series enables GZIP engine and provides user space API. Whereas VAS fault handling series process faults if NX sees fault on request buffer. selftest - https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-March/206035.html or https://github.com/abalib/power-gzip/tree/develop/selftest More tests are available - https://github.com/abalib/power-gzip libnxz - https://github.com/libnxz/power-gzip Thanks Haren > > 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
