On 12/20/18 8:38 PM, Christoph Hellwig wrote:
On Thu, Dec 20, 2018 at 07:35:15PM +0100, Daniel Vetter wrote:
Err, with streaming DMA buffer sharing is trivial. The coherent DMA
allocator is what causes all kinds of horrible hacks that can't actually
work on various platforms.
Hm, I thought the
On Thu, Dec 20, 2018 at 07:35:15PM +0100, Daniel Vetter wrote:
> > Err, with streaming DMA buffer sharing is trivial. The coherent DMA
> > allocator is what causes all kinds of horrible hacks that can't actually
> > work on various platforms.
>
> Hm, I thought the streaming dma api is the one tha
On Thu, Dec 20, 2018 at 7:33 PM Christoph Hellwig wrote:
>
> On Thu, Dec 20, 2018 at 07:29:37PM +0100, Daniel Vetter wrote:
> > What we most definitely not want to end up with though is actually
> > streaming dma, because with that all the zero copy buffer sharing
> > tricks become pointless. Ther
On Thu, Dec 20, 2018 at 07:29:37PM +0100, Daniel Vetter wrote:
> What we most definitely not want to end up with though is actually
> streaming dma, because with that all the zero copy buffer sharing
> tricks become pointless. There's pretty epic amounts of hacks to work
> around this, I have no id
On Thu, Dec 20, 2018 at 6:39 PM Christoph Hellwig wrote:
>
> On Thu, Dec 20, 2018 at 05:49:39PM +0200, Oleksandr Andrushchenko wrote:
> > This is the only patch [1], no series. And at the moment I think
> > there is nothing to review as I am not sure how to deal with those
> > shmem pages: this pa
On Thu, Dec 20, 2018 at 05:49:39PM +0200, Oleksandr Andrushchenko wrote:
> This is the only patch [1], no series. And at the moment I think
> there is nothing to review as I am not sure how to deal with those
> shmem pages: this patch is rather to start a discussion on how shmem
> pages can be flus
On 12/20/18 5:36 PM, Christoph Hellwig wrote:
On Tue, Dec 18, 2018 at 08:20:22PM +0100, Noralf Trønnes wrote:
+ if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents,
+ DMA_BIDIRECTIONAL)) {
Are you using the DMA streaming API as a way to flush the caches
On Wed, Dec 19, 2018 at 02:14:52PM +0100, Gerd Hoffmann wrote:
>
> > > > + if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents,
> > > > + DMA_BIDIRECTIONAL)) {
> > >
> > >
> > > Are you using the DMA streaming API as a way to flush the caches?
> > Yes
> > > Does this m
On Tue, Dec 18, 2018 at 08:20:22PM +0100, Noralf Trønnes wrote:
> > + if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents,
> > + DMA_BIDIRECTIONAL)) {
>
>
> Are you using the DMA streaming API as a way to flush the caches?
This looks rather broken. Please send t
On 12/19/18 6:14 PM, Noralf Trønnes wrote:
Den 19.12.2018 09.18, skrev Oleksandr Andrushchenko:
On 12/18/18 9:20 PM, Noralf Trønnes wrote:
Den 27.11.2018 11.32, skrev Oleksandr Andrushchenko:
From: Oleksandr Andrushchenko
When GEM backing storage is allocated with drm_gem_get_pages
the bac
On 12/19/18 4:10 PM, Gerd Hoffmann wrote:
Hi,
Sure this actually helps? It's below 4G in guest physical address
space, so it can be backed by pages which are actually above 4G in host
physical address space ...
Yes, you are right here. This is why I wrote about the IOMMU
and other conditio
Den 19.12.2018 09.18, skrev Oleksandr Andrushchenko:
On 12/18/18 9:20 PM, Noralf Trønnes wrote:
Den 27.11.2018 11.32, skrev Oleksandr Andrushchenko:
From: Oleksandr Andrushchenko
When GEM backing storage is allocated with drm_gem_get_pages
the backing pages may be cached, thus making it po
Hi,
> > Sure this actually helps? It's below 4G in guest physical address
> > space, so it can be backed by pages which are actually above 4G in host
> > physical address space ...
>
> Yes, you are right here. This is why I wrote about the IOMMU
> and other conditions. E.g. you can have a devi
On 12/19/18 3:14 PM, Gerd Hoffmann wrote:
Hi,
+ mapping = xen_obj->base.filp->f_mapping;
+ mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
Let's see if I understand what you're doing:
Here you say that the pages should be DMA accessible for devices that can
only see 4GB.
Yes,
Hi,
> > > + mapping = xen_obj->base.filp->f_mapping;
> > > + mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
> > Let's see if I understand what you're doing:
> >
> > Here you say that the pages should be DMA accessible for devices that can
> > only see 4GB.
>
> Yes, your understa
On 12/18/18 9:20 PM, Noralf Trønnes wrote:
Den 27.11.2018 11.32, skrev Oleksandr Andrushchenko:
From: Oleksandr Andrushchenko
When GEM backing storage is allocated with drm_gem_get_pages
the backing pages may be cached, thus making it possible that
the backend sees only partial content of the
Den 27.11.2018 11.32, skrev Oleksandr Andrushchenko:
From: Oleksandr Andrushchenko
When GEM backing storage is allocated with drm_gem_get_pages
the backing pages may be cached, thus making it possible that
the backend sees only partial content of the buffer which may
lead to screen artifacts.
On 12/14/18 10:35 AM, Daniel Vetter wrote:
On Fri, Dec 14, 2018 at 09:09:45AM +0200, Oleksandr Andrushchenko wrote:
On 12/13/18 5:48 PM, Daniel Vetter wrote:
On Thu, Dec 13, 2018 at 12:17:54PM +0200, Oleksandr Andrushchenko wrote:
Daniel, could you please comment?
Cross-revieweing someone els
On Fri, Dec 14, 2018 at 09:09:45AM +0200, Oleksandr Andrushchenko wrote:
> On 12/13/18 5:48 PM, Daniel Vetter wrote:
> > On Thu, Dec 13, 2018 at 12:17:54PM +0200, Oleksandr Andrushchenko wrote:
> > > Daniel, could you please comment?
> > Cross-revieweing someone else's stuff would scale better,
> f
On 12/13/18 5:48 PM, Daniel Vetter wrote:
On Thu, Dec 13, 2018 at 12:17:54PM +0200, Oleksandr Andrushchenko wrote:
Daniel, could you please comment?
Cross-revieweing someone else's stuff would scale better,
fair enough
I don't think
I'll get around to anything before next year.
I put you
On Thu, Dec 13, 2018 at 12:17:54PM +0200, Oleksandr Andrushchenko wrote:
> Daniel, could you please comment?
Cross-revieweing someone else's stuff would scale better, I don't think
I'll get around to anything before next year.
-Daniel
>
> Thank you
>
> On 11/27/18 12:32 PM, Oleksandr Andrushche
Daniel, could you please comment?
Thank you
On 11/27/18 12:32 PM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
When GEM backing storage is allocated with drm_gem_get_pages
the backing pages may be cached, thus making it possible that
the backend sees only partial content of th
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