From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08 Date: Tue, 7 Nov 2017 07:58:05 -0800 Message-ID: <20171107155805.GA24082@infradead.org> References: <1506763741-81429-1-git-send-email-xavier.huwei@huawei.com> <1506763741-81429-3-git-send-email-xavier.huwei@huawei.com> <20170930161023.GI2965@mtr-leonro.local> <59DF60A3.7080803@huawei.com> <5fe5f9b9-2c2b-ab3c-dafa-3e2add051bbb@arm.com> <59F97BBE.5070207@huawei.com> <5A011E49.6060407@huawei.com> <20171107154838.GC21466@ziepe.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20171107154838.GC21466-uk2M96/98Pc@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Cc: "Wei Hu (Xavier)" , Robin Murphy , Leon Romanovsky , shaobo.xu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, xavier.huwei-WVlzvzqoTvw@public.gmane.org, lijun_nudt-9Onoh4P/yGk@public.gmane.org, oulijun-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, charles.chenxin-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, linuxarm-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, liuyixian-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, zhangxiping3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, shaoboxu-WVlzvzqoTvw@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Tue, Nov 07, 2017 at 08:48:38AM -0700, Jason Gunthorpe wrote: > Can't you just use vmalloc and dma_map that? Other drivers follow that > approach.. You can't easily due to the flushing requirements. We used to do that in XFS and it led to problems. You need the page allocator + vmap + invalidate_kernel_vmap_range + flush_kernel_vmap_range to get the cache flushing right. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html