On 13.10.2017 11:38, Joerg Roedel wrote:
> On Thu, Oct 12, 2017 at 05:27:26PM +0300, Dmitry Osipenko wrote:
>> I'm not talking about any specific bug, but in general if allocator re-maps
>> already mapped region or unmaps the wrong-and-used region. I had those
>> bug-cases
>> during of development
On Thu, Oct 12, 2017 at 05:27:26PM +0300, Dmitry Osipenko wrote:
> I'm not talking about any specific bug, but in general if allocator re-maps
> already mapped region or unmaps the wrong-and-used region. I had those
> bug-cases
> during of development of the 'scattered' graphics allocations for Te
On 10.10.2017 12:53, Joerg Roedel wrote:
> On Wed, Oct 04, 2017 at 04:02:31AM +0300, Dmitry Osipenko wrote:
>> Due to a bug in IOVA allocator, page mapping could accidentally overwritten.
>> We can catch this case by checking 'VALID' bit of GART's page entry prior to
>> mapping of a page. Since tha
On Wed, Oct 04, 2017 at 04:02:31AM +0300, Dmitry Osipenko wrote:
> Due to a bug in IOVA allocator, page mapping could accidentally overwritten.
> We can catch this case by checking 'VALID' bit of GART's page entry prior to
> mapping of a page. Since that check introduces a noticeable performance
>
Due to a bug in IOVA allocator, page mapping could accidentally overwritten.
We can catch this case by checking 'VALID' bit of GART's page entry prior to
mapping of a page. Since that check introduces a noticeable performance
impact, it should be enabled explicitly by a new CONFIG_TEGRA_IOMMU_GART_
