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Date: Tue, 7 Nov 2017 07:58:05 -0800 From: Christoph Hellwig <hch@...radead.org> To: Jason Gunthorpe <jgg@...pe.ca> Cc: "Wei Hu (Xavier)" <xavier.huwei@...wei.com>, Robin Murphy <robin.murphy@....com>, Leon Romanovsky <leon@...nel.org>, shaobo.xu@...el.com, xavier.huwei@....com, lijun_nudt@....com, oulijun@...wei.com, linux-rdma@...r.kernel.org, charles.chenxin@...wei.com, linuxarm@...wei.com, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, dledford@...hat.com, liuyixian@...wei.com, zhangxiping3@...wei.com, shaoboxu@....com Subject: Re: [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08 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.
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