On 2017/11/1 20:26, Robin Murphy wrote:
> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/12 20:59, Robin Murphy wrote:
>>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
On 2017/11/1 20:26, Robin Murphy wrote:
> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/12 20:59, Robin Murphy wrote:
>>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
On 2017/11/7 23:48, Jason Gunthorpe wrote:
> On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>
>> We reconstruct the code as below:
>> It replaces dma_alloc_coherent with __get_free_pages and
>> dma_map_single functions. So, we can vmap serveral ptrs returned by
On 2017/11/7 23:48, Jason Gunthorpe wrote:
> On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>
>> We reconstruct the code as below:
>> It replaces dma_alloc_coherent with __get_free_pages and
>> dma_map_single functions. So, we can vmap serveral ptrs returned by
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
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
On 2017/11/7 14:32, Leon Romanovsky wrote:
> On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>>
>> On 2017/11/1 20:26, Robin Murphy wrote:
>>> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
On 2017/10/12 20:59, Robin Murphy wrote:
> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
On 2017/11/7 14:32, Leon Romanovsky wrote:
> On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>>
>> On 2017/11/1 20:26, Robin Murphy wrote:
>>> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
On 2017/10/12 20:59, Robin Murphy wrote:
> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
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
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
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 +
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 +
On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
> We reconstruct the code as below:
> It replaces dma_alloc_coherent with __get_free_pages and
> dma_map_single functions. So, we can vmap serveral ptrs returned by
> __get_free_pages, right?
Can't you just use
On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
> We reconstruct the code as below:
> It replaces dma_alloc_coherent with __get_free_pages and
> dma_map_single functions. So, we can vmap serveral ptrs returned by
> __get_free_pages, right?
Can't you just use
On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/11/1 20:26, Robin Murphy wrote:
> > On 01/11/17 07:46, Wei Hu (Xavier) wrote:
> >>
> >> On 2017/10/12 20:59, Robin Murphy wrote:
> >>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
> On 2017/10/1 0:10, Leon Romanovsky
On Tue, Nov 07, 2017 at 10:45:29AM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/11/1 20:26, Robin Murphy wrote:
> > On 01/11/17 07:46, Wei Hu (Xavier) wrote:
> >>
> >> On 2017/10/12 20:59, Robin Murphy wrote:
> >>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
> On 2017/10/1 0:10, Leon Romanovsky
On 2017/11/1 20:26, Robin Murphy wrote:
> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/12 20:59, Robin Murphy wrote:
>>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
On 2017/11/1 20:26, Robin Murphy wrote:
> On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/12 20:59, Robin Murphy wrote:
>>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/12 20:59, Robin Murphy wrote:
>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
>>>
>>> On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> If the IOMMU is enabled, the length
On 01/11/17 07:46, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/12 20:59, Robin Murphy wrote:
>> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
>>>
>>> On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> If the IOMMU is enabled, the length
On 2017/10/12 20:59, Robin Murphy wrote:
> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/1 0:10, Leon Romanovsky wrote:
>>> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not
On 2017/10/12 20:59, Robin Murphy wrote:
> On 12/10/17 13:31, Wei Hu (Xavier) wrote:
>>
>> On 2017/10/1 0:10, Leon Romanovsky wrote:
>>> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not
On Wed, Oct 18, 2017 at 05:12:02PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/18 16:42, Wei Hu (Xavier) wrote:
> >
> >
> > On 2017/10/1 0:10, Leon Romanovsky wrote:
> > > On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> > > > If the IOMMU is enabled, the length of sg obtained
On Wed, Oct 18, 2017 at 05:12:02PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/18 16:42, Wei Hu (Xavier) wrote:
> >
> >
> > On 2017/10/1 0:10, Leon Romanovsky wrote:
> > > On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> > > > If the IOMMU is enabled, the length of sg obtained
On 2017/10/18 16:42, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the
On 2017/10/18 16:42, Wei Hu (Xavier) wrote:
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
On Thu, Oct 12, 2017 at 08:31:31PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/1 0:10, Leon Romanovsky wrote:
> > On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> > > If the IOMMU is enabled, the length of sg obtained from
> > > __iommu_map_sg_attrs is not 4kB. When the IOVA
On Thu, Oct 12, 2017 at 08:31:31PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2017/10/1 0:10, Leon Romanovsky wrote:
> > On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> > > If the IOMMU is enabled, the length of sg obtained from
> > > __iommu_map_sg_attrs is not 4kB. When the IOVA
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
On 2017/10/1 0:10, Leon Romanovsky wrote:
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> If the IOMMU is enabled, the length of sg obtained from
> __iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
> dma address, the IOVA will not be page continuous. and the VA
> returned from dma_alloc_coherent is a
On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
> If the IOMMU is enabled, the length of sg obtained from
> __iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
> dma address, the IOVA will not be page continuous. and the VA
> returned from dma_alloc_coherent is a
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
returned from dma_alloc_coherent is a vmalloc address. However,
the VA obtained by the page_address is a
If the IOMMU is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous. and the VA
returned from dma_alloc_coherent is a vmalloc address. However,
the VA obtained by the page_address is a
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