The Intel(R) QuickData Technology specification version 3.2 adds support for offloading raid parity calculations. This patchset builds upon the md raid6 acceleration patchset [1] and the ioatdma refactoring patchset [2]. Beyond the new operation types and descriptor formats these raid engines require a few changes to the current dmaengine/async_tx offload infrastructure: 1/ v3.2 channels may prefetch descriptors which leads to later descriptors in the chain possibly starting their reads before earlier descriptors in the chain have completed their writes. A 'fence' bit is specified in the descriptor to disable this optimization in case there are data dependencies in the chain. Fenced operation must be explicitly requested at the async_tx api level. 2/ The descriptor ring scheme of the ioatdma driver for v2+ devices precludes async_tx channel switching. The scheme requires that ->prep() and ->submit() calls not be reordered. To support this constraint the dmaengine channel allocator is modified to only return "raid" engines when CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH=y which ensures that the async_tx api only ever sees channels that have all the requisite capabilities. 3/ Raid operations must be 4-byte aligned, so per operation alignment checks are added to the async_tx api. A couple user visible changes are included in this update: 1/ A 'quickdata' attribute directory is added to the sysfs path of ioatdma channel objects. This allows channels with raid capabilities to be identified and the activity of the channel to be monitored. 2/ The ioatdma module will now be auto-loaded by the hotplug infrastructure. Add "blacklist ioatdma" to /etc/modprobe.d/blacklist to maintain the prior policy. Provided the md raid6 acceleration patches [1] are accepted this patchset will follow them into 2.6.32. git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git ioat-raid Regards, Dan [1]: http://marc.info/?l=linux-raid&m=125173687620741&w=2 [2]: http://marc.info/?l=linux-raid&m=125203215231330&w=2 --- Dan Williams (15): dmaengine: add fence support dmaengine, async_tx: add a "no channel switch" allocator dmaengine: cleanup unused transaction types dmaengine, async_tx: support alignment checks ioat2+: add fence support ioat3: hardware version 3.2 register / descriptor definitions ioat3: split ioat3 support to its own file, add memset ioat: add 'ioat' sysfs attributes ioat3: enable dca for completion writes ioat3: xor support ioat3: xor self test ioat3: pq support ioat3: support xor via pq descriptors ioat3: interrupt descriptor support ioat3: segregate raid engines Roland Dreier (2): Add MODULE_DEVICE_TABLE() so ioatdma module is autoloaded I/OAT: Convert to PCI_VDEVICE() Tom Picard (1): ioat3: ioat3.2 pci ids for Jasper Forest arch/arm/mach-iop13xx/setup.c | 7 - arch/arm/plat-iop/adma.c | 2 - crypto/async_tx/async_memcpy.c | 9 +- crypto/async_tx/async_memset.c | 9 +- crypto/async_tx/async_pq.c | 11 +- crypto/async_tx/async_raid6_recov.c | 47 +- crypto/async_tx/async_tx.c | 4 + crypto/async_tx/async_xor.c | 16 +- drivers/dma/Kconfig | 4 + drivers/dma/dmaengine.c | 40 ++ drivers/dma/dmatest.c | 14 + drivers/dma/ioat/Makefile | 2 +- drivers/dma/ioat/dma.c | 136 ++++- drivers/dma/ioat/dma.h | 34 +- drivers/dma/ioat/dma_v2.c | 129 ++-- drivers/dma/ioat/dma_v2.h | 46 ++- drivers/dma/ioat/dma_v3.c | 1220 +++++++++++++++++++++++++++++++++++ drivers/dma/ioat/hw.h | 142 ++++ drivers/dma/ioat/pci.c | 45 +- drivers/dma/ioat/registers.h | 20 + drivers/dma/iop-adma.c | 5 +- drivers/md/raid5.c | 37 +- include/linux/async_tx.h | 3 + include/linux/dmaengine.h | 60 ++- include/linux/pci_ids.h | 10 + 25 files changed, 1880 insertions(+), 172 deletions(-) create mode 100644 drivers/dma/ioat/dma_v3.c -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
