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From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: David1.Zhou@amd.com, intel-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,
	jgg@ziepe.ca, linux-media@vger.kernel.org
Subject: Re: [Intel-gfx] [PATCH 1/6] lib/scatterlist: add sg_set_dma_addr() function
Date: Thu, 12 Mar 2020 11:14:22 +0100	[thread overview]
Message-ID: <f2b46f49-a8d0-9d43-3120-e1ed36fc3a80@gmail.com> (raw)
In-Reply-To: <20200311152838.GA24280@infradead.org>

Am 11.03.20 um 16:28 schrieb Christoph Hellwig:
> On Wed, Mar 11, 2020 at 02:51:53PM +0100, Christian König wrote:
>> This can be used by drivers to setup P2P DMA between device
>> memory which is not backed by struct pages.
>>
>> The drivers of the involved devices are responsible for
>> setting up and tearing down DMA addresses as necessary
>> using dma_map_resource().
>>
>> The page pointer is set to NULL and only the DMA address,
>> length and offset values are valid.
> NAK.  The only valid way to fill DMA address in scatterlists is
> dma_map_sg / dma_map_sg_attr.

How can we then map PCIe BARs into an scatterlist which are not backed 
by struct pages?

Regards,
Christian.
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  reply	other threads:[~2020-03-12 13:13 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 13:51 [Intel-gfx] P2P for DMA-buf Christian König
2020-03-11 13:51 ` [Intel-gfx] [PATCH 1/6] lib/scatterlist: add sg_set_dma_addr() function Christian König
2020-03-11 15:28   ` Christoph Hellwig
2020-03-12 10:14     ` Christian König [this message]
2020-03-12 10:19       ` Christoph Hellwig
2020-03-12 10:31         ` Christian König
2020-03-12 10:47           ` Christoph Hellwig
2020-03-12 11:02             ` Christian König
     [not found]             ` <20200312141928.GK31668@ziepe.ca>
2020-03-12 15:39               ` Christian König
2020-03-12 16:13               ` Logan Gunthorpe
2020-03-13 11:21               ` Christoph Hellwig
2020-03-13 13:33                 ` Christian König
     [not found]                 ` <20200313121742.GZ31668@ziepe.ca>
2020-03-16  8:56                   ` Christoph Hellwig
2020-03-16  9:41                     ` Christian König
2020-03-16  9:52                       ` Christoph Hellwig
2020-03-11 13:51 ` [Intel-gfx] [PATCH 2/6] dma-buf: add peer2peer flag Christian König
2020-03-11 13:51 ` [Intel-gfx] [PATCH 3/6] drm/amdgpu: note that we can handle peer2peer DMA-buf Christian König
2020-03-11 13:51 ` [Intel-gfx] [PATCH 4/6] drm/amdgpu: add checks if DMA-buf P2P is supported Christian König
     [not found]   ` <20200311140415.GB31668@ziepe.ca>
2020-03-11 14:33     ` Christian König
     [not found]       ` <20200311143835.GD31668@ziepe.ca>
2020-03-11 14:43         ` Christian König
2020-03-11 13:51 ` [Intel-gfx] [PATCH 5/6] drm/amdgpu: add support for exporting VRAM using DMA-buf v2 Christian König
2020-03-11 15:08   ` Alex Deucher
2020-03-11 13:51 ` [Intel-gfx] [PATCH 6/6] drm/amdgpu: improve amdgpu_gem_info debugfs file Christian König
2020-03-11 18:09 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/6] lib/scatterlist: add sg_set_dma_addr() function Patchwork
2020-03-11 18:34 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork

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