3 Commits

Author	SHA1	Message	Date
Logan Gunthorpe	4d3df16840	dmaengine: plx-dma: Implement descriptor submission ... On prep, a spin lock is taken and the next entry in the circular buffer is filled. On submit, the valid bit is set in the hardware descriptor and the lock is released. The DMA engine is started (if it's not already running) when the client calls dma_async_issue_pending(). Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Link: https://lore.kernel.org/r/20200103212021.2881-4-logang@deltatee.com Signed-off-by: Vinod Koul <vkoul@kernel.org>	2020-01-15 19:40:51 +05:30
Logan Gunthorpe	c2dbcaa8c6	dmaengine: plx-dma: Implement hardware initialization and cleanup ... Allocate DMA coherent memory for the ring of DMA descriptors and program the appropriate hardware registers. A tasklet is created which is triggered on an interrupt to process all the finished requests. Additionally, any remaining descriptors are aborted when the hardware is removed or the resources freed. Use an RCU pointer to synchronize PCI device unbind. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Link: https://lore.kernel.org/r/20200103212021.2881-3-logang@deltatee.com Signed-off-by: Vinod Koul <vkoul@kernel.org>	2020-01-15 19:40:51 +05:30
Logan Gunthorpe	905ca51e63	dmaengine: plx-dma: Introduce PLX DMA engine PCI driver skeleton ... Some PLX Switches can expose DMA engines via extra PCI functions on the upstream port. Each function will have one DMA channel. This patch is just the core PCI driver skeleton and dma engine registration. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Link: https://lore.kernel.org/r/20200103212021.2881-2-logang@deltatee.com Signed-off-by: Vinod Koul <vkoul@kernel.org>	2020-01-15 19:40:51 +05:30