P9 introduces Virtual Accelerator Switchboard (VAS) to communicate with NX 842 engine. icswx function is used to access NX before. On powerNV systems, NX-842 driver invokes VAS functions for configuring RxFIFO (receive window) per each NX engine. VAS uses this FIFO to communicate the request to NX. The kernel opens send window which is used to transfer compression/decompression requests to VAS. It maps the send window to the corresponding RxFIFO. copy/paste instructions are used to pass the CRB to VAS.
This patch series adds P9 NX support for 842 compression engine. First 4 patches reorganize the current code so that VAS function can be added. - nx842_powernv_function points to VAS function if VAS feature is available. Otherwise icswx function is used. - Move configure CRB code nx842_cfg_crb() - In addition to freeing co-processor structs for initialization failures and exit, both send and receive windows have to closed for VAS. - Move updating coprocessor info list to nx842_add_coprocs_list(). The last 2 patches adds configuring and invoking VAS, and also checking P9 NX specific errors that are provided in co-processor status block (CSB) for failures. Patches have been tested on P9 DD1 system using VAS changes and on P8 HW to make sure no regression. This patchset depends on VAS kernel changes: https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-May/158178.html Thanks to Sukadev Bhattiprolu for his review, input and testing with VAS changes. Also thanks to Michael Ellerman and Benjamin Herrenschmidt for their valuable guidance and comments. Changelog[V3] - preemption disable for copy/paste as Nichalos Piggin suggested. - PTR_ALIGN for workmem buffer based on Ram Pai's comemnt. Changelog[v2] - Open/close send windows in nx842_poernv_crypto_init/exit_vas(). - Changes for the new device-tree NX properties such as priority and compatible properties. - Incorporated review comments from Michael Ellerman. - Other minor issues found during HW testing. Haren Myneni (6): crypto/nx842: Rename nx842_powernv_function as icswx function crypto/nx: Create nx842_configure_crb function crypto/nx: Create nx842_delete_coprocs function crypto/nx: Add nx842_add_coprocs_list function crypto/nx: Add P9 NX specific error codes for 842 engine crypto/nx: Add P9 NX support for 842 compression engine. arch/powerpc/include/asm/icswx.h | 3 + drivers/crypto/nx/Kconfig | 1 + drivers/crypto/nx/nx-842-powernv.c | 499 +++++++++++++++++++++++++++++++++---- drivers/crypto/nx/nx-842.c | 2 +- drivers/crypto/nx/nx-842.h | 8 + 5 files changed, 465 insertions(+), 48 deletions(-) -- 2.11.0
