From: Jason Gunthorpe <jgg-uk2M96/98Pc@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: "Wei Hu (Xavier)"
<xavier.huwei-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
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,
Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
charles.chenxin-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
linuxarm-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
liuyixian-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
zhangxiping3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
shaoboxu-WVlzvzqoTvw@public.gmane.org,
dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08
Date: Tue, 7 Nov 2017 09:03:29 -0700 [thread overview]
Message-ID: <20171107160329.GF21466@ziepe.ca> (raw)
In-Reply-To: <20171107155805.GA24082-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
On Tue, Nov 07, 2017 at 07:58:05AM -0800, 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.
Yes, exactly something ugly like that.. :\
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Christoph Hellwig <hch@infradead.org>
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 09:03:29 -0700 [thread overview]
Message-ID: <20171107160329.GF21466@ziepe.ca> (raw)
In-Reply-To: <20171107155805.GA24082@infradead.org>
On Tue, Nov 07, 2017 at 07:58:05AM -0800, 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.
Yes, exactly something ugly like that.. :\
Jason
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WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Christoph Hellwig <hch@infradead.org>
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 09:03:29 -0700 [thread overview]
Message-ID: <20171107160329.GF21466@ziepe.ca> (raw)
In-Reply-To: <20171107155805.GA24082@infradead.org>
On Tue, Nov 07, 2017 at 07:58:05AM -0800, 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.
Yes, exactly something ugly like that.. :\
Jason
next prev parent reply other threads:[~2017-11-07 16:03 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-30 9:28 [PATCH for-next 0/4] Add Features & Code improvements for hip08 Wei Hu (Xavier)
2017-09-30 9:28 ` Wei Hu (Xavier)
2017-09-30 9:28 ` [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08 Wei Hu (Xavier)
2017-09-30 9:28 ` Wei Hu (Xavier)
[not found] ` <1506763741-81429-3-git-send-email-xavier.huwei-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-09-30 16:10 ` Leon Romanovsky
2017-09-30 16:10 ` Leon Romanovsky
2017-10-12 12:31 ` Wei Hu (Xavier)
2017-10-12 12:31 ` Wei Hu (Xavier)
[not found] ` <59DF60A3.7080803-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-12 12:59 ` Robin Murphy
2017-10-12 12:59 ` Robin Murphy
2017-10-12 12:59 ` Robin Murphy
2017-11-01 7:46 ` Wei Hu (Xavier)
2017-11-01 7:46 ` Wei Hu (Xavier)
[not found] ` <59F97BBE.5070207-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-01 12:26 ` Robin Murphy
2017-11-01 12:26 ` Robin Murphy
2017-11-01 12:26 ` Robin Murphy
[not found] ` <fc7433af-4fa7-6b78-6bec-26941a427002-5wv7dgnIgG8@public.gmane.org>
2017-11-07 2:45 ` Wei Hu (Xavier)
2017-11-07 2:45 ` Wei Hu (Xavier)
2017-11-07 2:45 ` Wei Hu (Xavier)
[not found] ` <5A011E49.6060407-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-07 6:32 ` Leon Romanovsky
2017-11-07 6:32 ` Leon Romanovsky
[not found] ` <20171107063209.GA18825-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-11-09 1:17 ` Wei Hu (Xavier)
2017-11-09 1:17 ` Wei Hu (Xavier)
2017-11-09 1:17 ` Wei Hu (Xavier)
2017-11-07 15:48 ` Jason Gunthorpe
2017-11-07 15:48 ` Jason Gunthorpe
[not found] ` <20171107154838.GC21466-uk2M96/98Pc@public.gmane.org>
2017-11-07 15:58 ` Christoph Hellwig
2017-11-07 15:58 ` Christoph Hellwig
2017-11-07 15:58 ` Christoph Hellwig
[not found] ` <20171107155805.GA24082-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-11-07 16:03 ` Jason Gunthorpe [this message]
2017-11-07 16:03 ` Jason Gunthorpe
2017-11-07 16:03 ` Jason Gunthorpe
2017-11-09 1:26 ` Wei Hu (Xavier)
2017-11-09 1:26 ` Wei Hu (Xavier)
2017-11-09 1:26 ` Wei Hu (Xavier)
2017-11-09 1:30 ` Wei Hu (Xavier)
2017-11-09 1:30 ` Wei Hu (Xavier)
2017-11-09 1:30 ` Wei Hu (Xavier)
2017-11-09 1:36 ` Wei Hu (Xavier)
2017-11-09 1:36 ` Wei Hu (Xavier)
2017-10-12 14:54 ` Leon Romanovsky
2017-10-18 8:42 ` Wei Hu (Xavier)
2017-10-18 8:42 ` Wei Hu (Xavier)
[not found] ` <59E713EE.5040703-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-18 9:12 ` Wei Hu (Xavier)
2017-10-18 9:12 ` Wei Hu (Xavier)
[not found] ` <59E71AE2.6080202-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-18 14:23 ` Leon Romanovsky
2017-10-18 14:23 ` Leon Romanovsky
[not found] ` <1506763741-81429-1-git-send-email-xavier.huwei-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-09-30 9:28 ` [PATCH for-next 1/4] RDMA/hns: Support WQE/CQE/PBL page size configurable feature " Wei Hu (Xavier)
2017-09-30 9:28 ` Wei Hu (Xavier)
2017-09-30 9:29 ` [PATCH for-next 3/4] RDMA/hns: Update the IRRL table chunk size " Wei Hu (Xavier)
2017-09-30 9:29 ` Wei Hu (Xavier)
[not found] ` <1506763741-81429-4-git-send-email-xavier.huwei-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-01 5:40 ` Leon Romanovsky
2017-10-01 5:40 ` Leon Romanovsky
2017-10-17 11:40 ` Wei Hu (Xavier)
2017-10-17 11:40 ` Wei Hu (Xavier)
2017-09-30 9:29 ` [PATCH for-next 4/4] RDMA/hns: Update the PD&CQE&MTT specification " Wei Hu (Xavier)
2017-09-30 9:29 ` Wei Hu (Xavier)
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