The Broadcom SBA RAID is a stream-based device which provides RAID5/6 offload. It requires a SoC specific ring manager (such as Broadcom FlexRM ring manager) to provide ring-based programming interface. Due to this, the Broadcom SBA RAID driver (mailbox client) implements DMA device having one DMA channel using a set of mailbox channels provided by Broadcom SoC specific ring manager driver (mailbox controller). Important limitations of Broadcom SBA RAID hardware are: 1. Requires disk position instead of disk coefficient 2. Supports only 30 PQ disk coefficients To address limitation #1, we have added raid_gflog table which will help driver convert disk coefficient to disk position. To address limitation #2, we have extended Linux Async Tx APIs to check for available PQ coefficients before doing PQ offload. This patchset is based on Linux-4.10-rc6 and depends on patchset "[PATCH v4 0/2] Broadcom FlexRM ring manager support" It is also available at sba-raid-v1 branch of https://github.com/Broadcom/arm64-linux.git Anup Patel (6): mailbox: Add new API mbox_channel_device() for clients lib/raid6: Add log-of-2 table for RAID6 HW requiring disk position async_tx: Handle DMA devices having support for fewer PQ coefficients async_tx: Fix DMA_PREP_FENCE usage in do_async_gen_syndrome() dmaengine: Add Broadcom SBA RAID driver dt-bindings: Add DT bindings document for Broadcom SBA RAID driver .../devicetree/bindings/dma/brcm,iproc-sba.txt | 29 + crypto/async_tx/async_pq.c | 8 +- crypto/async_tx/async_raid6_recov.c | 12 +- drivers/dma/Kconfig | 13 + drivers/dma/Makefile | 1 + drivers/dma/bcm-sba-raid.c | 1309 ++++++++++++++++++++ drivers/mailbox/mailbox.c | 21 + include/linux/dmaengine.h | 19 + include/linux/mailbox_client.h | 1 + include/linux/raid/pq.h | 4 + lib/raid6/mktables.c | 20 + 11 files changed, 1432 insertions(+), 5 deletions(-) create mode 100644 Documentation/devicetree/bindings/dma/brcm,iproc-sba.txt create mode 100644 drivers/dma/bcm-sba-raid.c -- 2.7.4
