On Thu, Jul 09, 2026 at 07:12:39PM +0530, Akhil P Oommen wrote: > On 7/7/2026 10:09 PM, Dmitry Baryshkov wrote: > > On Tue, Jul 07, 2026 at 05:02:43PM +0200, Anna Maniscalco wrote: > >> On 7/6/26 5:04 PM, Dmitry Baryshkov wrote: > >>> On Sun, Jul 05, 2026 at 09:13:37PM +0200, Anna Maniscalco wrote: > >>>> In order to associate the SID used by LPAC to it's own domain and > >>>> context bank we need a separate node on the DTS. > >>> Can we use iommu-map instead of adding a new device using the same > >>> addresses? You provide zero explanations, but it seems like you are > >>> trying to separate a part of the GPU into a separate device, but it's > >>> unnecessary. > >> > >> What I was trying to say is that we need to map sid0 and sid1 to different > >> context banks. > >> > >> From what I recall, so long as we use the same dt node, the iommu drivert > >> provides no way of doing this. > >> > >> What kgsl does is having a node for the iommu and then subnodes for gfx > >> lpac > >> and secure. > >> > >> The address on the lpac device doesn't really matter. I have very limted > >> knowledge of DTSs but I think we could just leave it out altogether? > > > > I think, you were poined to the Glymur Iris patches. Another option is > > the QDA driver being submitted too. Both ot them use iommu-map to > > describe the same usecase - a set of SIDs which are used by the device > > but which should not be a part of the defaut set. With it in place you > > don't need to have separate qcom,lpac devices, no additional properties, > > etc. > > > > I'd recommend following the same approach. > > iiuc, the conclusion in this recent thread is to use child nodes for a > similar case: > https://lore.kernel.org/all/[email protected]/
Let me check internally. > > -Akhil > > > > >> > >>> > >>>> Add the code to look up that node on initialization. > >>>> > >>>> Signed-off-by: Anna Maniscalco <[email protected]> > >>>> --- > >>>> drivers/gpu/drm/msm/adreno/adreno_gpu.c | 21 ++++++++++++++++++++- > >>>> drivers/gpu/drm/msm/msm_gpu.h | 1 + > >>>> 2 files changed, 21 insertions(+), 1 deletion(-) > >>>> > >> > >> Best regards, > >> -- > >> Anna Maniscalco <[email protected]> > >> > > > -- With best wishes Dmitry
