> -----Original Message----- > From: Bart Van Assche [mailto:Bart.VanAssche@xxxxxxxxxxx] > Sent: Friday, January 13, 2017 5:00 PM > To: Estrin, Alex <alex.estrin@xxxxxxxxx>; dledford@xxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; > gregkh@xxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH v2 00/26] IB: Optimize DMA mapping > > On Fri, 2017-01-13 at 21:08 +0000, Estrin, Alex wrote: > > It didn't fix the failure... Apparently there is an issue with generic > > mapping itself. > > Hello Alex, > > The generic mapping code in lib/dma-virt.c works fine with at least the rxe > driver. Additionally, as far as I can see the mapping code in lib/dma-virt.c > is identical to the mapping in drivers/infiniband/sw/rdmavt/dma.c. What is > not clear to me however is how my patches can have caused the SDMA engine > error messages? As far as I can see the code in > drivers/infiniband/hw/hfi1/sdma.c uses PCI DMA mapping operations instead of > the generic dma_virt_ops. Is that correct? Hi Bart, If you refer to code like this from sdma.c: /* dma map the coalesce buffer */ addr = dma_map_single(&dd->pcidev->dev, ..... please see hfi1/verbs.c @ hfi1_register_ib_device() 'dma_device' field is initialized here -> ibdev->dma_device = &dd->pcidev->dev; followed by ret = rvt_register_device(&dd->verbs_dev.rdi); -> set_dma_ops(rdi->ibdev.dma_device, &dma_virt_ops); Thanks, Alex. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
