Re: [PATCH 00/22] media: iris: Restrict lower IOVA range for Venus and Iris VPUs

[Vikash Garodia <vikash.garodia@oss.qualcomm.com>]

On 8/7/2026 2:29 PM, Dmitry Baryshkov wrote:
> On Fri, Aug 07, 2026 at 01:54:44PM +0530, Vikash Garodia wrote:
>> Qualcomm venus and iris VPUs reserve IOVA addresses below 0x25800000
>> (600MB) for non-pixel stream ID in secure mode. When the kernel
>> allocates DMA mappings from this restricted range, the VPU generate
>> unhandled SMMU page faults, leading to video failures and, in some
>> cases, spontaneous system reboots.
>>   
>> The issue is readily reproducible on affected platforms by running
>> multiple concurrent video decode workloads, such as opening several
>> browser tabs containing video streams.
>>
>> To prevent allocations in the restricted region, this series introduces
>> support for an IOMMU IOVA reserve memory-region in the Venus and Iris
>> bindings and updates all affected device trees to reserve the low IOVA
>> range [0, 0x25800000]. The memory-region is referenced by the video codec
>> node, allowing the IOMMU layer to keep DMA allocations above the reserved
>> boundary.
>>   
>> The series consists of:
>>   
>>    * Binding updates for Venus and Iris schemas to permit an additional
>>      memory-region phandle describing the IOVA reservation.
>>    * DTS updates for all affected Venus platforms.
>>    * DTS updates for all affected Iris platforms.
>>   
>> This ensures that DMA allocations do not overlap restricted IOVA
>> mappings for non-pixel stream IDs and prevents the resulting SMMU
>> faults.
> Some of these patches have been sent already. Why is it again at v1?

By some, i assume you are referring to the 2 patches from Daniel. Kept 
it as part of this series to maintain the continuity with patches across 
other socs, other option would be to bring them as dependency and drop 
them from here.

> 
>> Signed-off-by: Vikash Garodia<vikash.garodia@oss.qualcomm.com>
>> ---
>> Daniel J Blueman (2):
>>        dt-bindings: media: qcom,sm8550-iris: Allow IOVA reservation memory-region
>>        arm64: dts: qcom: hamoa: Reserve low IOVA range for Iris
>>
>> Vikash Garodia (20):
>>        dt-bindings: media: qcom,venus-common: Allow IOVA reservation memory-region