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Date: Thu, 9 Nov 2017 09:26:27 +0800 From: "Wei Hu (Xavier)" <xavier.huwei@...wei.com> To: Christoph Hellwig <hch@...radead.org>, Jason Gunthorpe <jgg@...pe.ca> CC: 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 2017/11/7 23:58, Christoph Hellwig wrote: > 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. > > . Hi, Christoph Hellwig Thanks for your suggestion. Regards Wei Hu
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