Re: [PATCH v4 3/4] dmaengine: Add Broadcom SBA RAID driver
From: Dan Williams
Date: Wed Feb 15 2017 - 01:43:35 EST
On Tue, Feb 14, 2017 at 10:25 PM, Anup Patel <anup.patel@xxxxxxxxxxxx> wrote:
> On Tue, Feb 14, 2017 at 10:04 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
>> On Mon, Feb 13, 2017 at 10:51 PM, Anup Patel <anup.patel@xxxxxxxxxxxx> wrote:
>>> The Broadcom stream buffer accelerator (SBA) provides offloading
>>> capabilities for RAID operations. This SBA offload engine is
>>> accessible via Broadcom SoC specific ring manager.
>>> This patch adds Broadcom SBA RAID driver which provides one
>>> DMA device with RAID capabilities using one or more Broadcom
>>> SoC specific ring manager channels. The SBA RAID driver in its
>>> current shape implements memcpy, xor, and pq operations.
>>> Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxxxx>
>>> Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
>>> drivers/dma/Kconfig | 13 +
>>> drivers/dma/Makefile | 1 +
>>> drivers/dma/bcm-sba-raid.c | 1694 ++++++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 1708 insertions(+)
>>> create mode 100644 drivers/dma/bcm-sba-raid.c
>>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>>> index 263495d..bf8fb84 100644
>>> --- a/drivers/dma/Kconfig
>>> +++ b/drivers/dma/Kconfig
>>> @@ -99,6 +99,19 @@ config AXI_DMAC
>>> controller is often used in Analog Device's reference designs for FPGA
>>> +config BCM_SBA_RAID
>>> + tristate "Broadcom SBA RAID engine support"
>>> + depends on (ARM64 && MAILBOX && RAID6_PQ) || COMPILE_TEST
>>> + select DMA_ENGINE
>>> + select DMA_ENGINE_RAID
>>> + select ASYNC_TX_ENABLE_CHANNEL_SWITCH
>> I thought you agreed to drop this. Its usage is broken.
> If ASYNC_TX_ENABLE_CHANNEL_SWITCH is not selected
> then async_dma_find_channel() will only try to find channel
> with DMA_ASYNC_TX capability.
> The DMA_ASYNC_TX capability is set by
> dma_async_device_register() when all Async Tx
> capabilities are supported by a DMA devices namely
> DMA_INTERRUPT, DMA_MEMCPY, DMA_XOR,
> DMA_XOR_VAL, DMA_PQ, and DMA_PQ_VAL.
> We only support DMA_MEMCPY, DMA_XOR, and
> DMA_PQ capabilities in BCM-SBA-RAID driver so
> DMA_ASYNC_TX capability is never set for the
> DMA device registered by BCM-SBA-RAID driver.
> Due to above, if ASYNC_TX_ENABLE_CHANNEL_SWITCH
> is not selected then Async Tx APIs fail to find DMA
> channel provided by BCM-SBA-RAID hence the
> option ASYNC_TX_ENABLE_CHANNEL_SWITCH is
> required for BCM-SBA-RAID.
> The DMA mappings are violated by channel switching
> only if we switch form DMA channel A to DMA channel
> B and both these DMA channels have different underlying
> "struct device". In most of the cases DMA mappings
> are not violated because DMA channels having
> Async Tx capabilities are provided using same
> underlying "struct device".
No, fix the infrastructure. Do not put local hack in your driver for
this global problem .