From: Christoph Hellwig <hch@infradead.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Wei Hu (Xavier)" <xavier.huwei@huawei.com>,
Robin Murphy <robin.murphy@arm.com>,
Leon Romanovsky <leon@kernel.org>,
shaobo.xu@intel.com, xavier.huwei@tom.com, lijun_nudt@163.com,
oulijun@huawei.com, linux-rdma@vger.kernel.org,
charles.chenxin@huawei.com, linuxarm@huawei.com,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, dledford@redhat.com, liuyixian@huawei.com,
zhangxiping3@huawei.com, shaoboxu@tom.com
Subject: Re: [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08
Date: Tue, 7 Nov 2017 07:58:05 -0800 [thread overview]
Message-ID: <20171107155805.GA24082@infradead.org> (raw)
In-Reply-To: <20171107154838.GC21466@ziepe.ca>
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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next prev parent reply other threads:[~2017-11-07 15:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1506763741-81429-1-git-send-email-xavier.huwei@huawei.com>
[not found] ` <1506763741-81429-3-git-send-email-xavier.huwei@huawei.com>
[not found] ` <20170930161023.GI2965@mtr-leonro.local>
2017-10-12 12:31 ` [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08 Wei Hu (Xavier)
2017-10-12 12:59 ` Robin Murphy
2017-11-01 7:46 ` Wei Hu (Xavier)
2017-11-01 12:26 ` Robin Murphy
2017-11-07 2:45 ` Wei Hu (Xavier)
2017-11-07 6:32 ` Leon Romanovsky
2017-11-09 1:17 ` Wei Hu (Xavier)
2017-11-07 15:48 ` Jason Gunthorpe
2017-11-07 15:58 ` Christoph Hellwig [this message]
2017-11-07 16:03 ` Jason Gunthorpe
2017-11-09 1:26 ` Wei Hu (Xavier)
2017-11-09 1:30 ` Wei Hu (Xavier)
2017-11-09 1:36 ` Wei Hu (Xavier)
2017-10-12 14:54 ` Leon Romanovsky
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