Re: [PATCH] arm64: dts: qcom: purwa: Fix GPU IOMMU property

[Bjorn Andersson]

On Fri, 10 Apr 2026 02:38:51 +0530, Akhil P Oommen wrote:
> Purwa's GPU does not support SID 1, which is typically used for
> LPAC-related traffic. Remove SID 1 from the GPU node's iommus property to
> accurately describe the hardware. This fixes the splat below, seen with
> some versions of Gunyah hypervisor:
> 
>   Internal error: synchronous external abort: 0000000096000010 [#1]  SMP
>   CPU: 0 UID: 0 PID: 80 Comm: kworker/u33:2 Tainted: G   M
>   Tainted: [M]=MACHINE_CHECK
>   Hardware name: Qualcomm Technologies, Inc. Purwa IoT EVK (DT)
>   Workqueue: events_unbound deferred_probe_work_func
>   pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
>   pc : arm_smmu_write_s2cr+0x9c/0xbc
>   lr : arm_smmu_master_install_s2crs+0x78/0xa4
>   sp : ffff80008039b570
>   x29: ffff80008039b570 x28: 0000000000000000 x27: ffffaddd62f1ab78
>   x26: ffff00080a4ff280 x25: 0000000000000018 x24: ffff00080b896480
>   x23: ffff00080ba9b7a0 x22: ffff00080bb05160 x21: 0000000000000000
>   x20: 0000000000000000 x19: 0000000000000001 x18: 00000000ffffffff
>   x17: 0000000000000000 x16: 0000000000000000 x15: ffff80008039b1d0
>   x14: ffff80010039b37d x13: 00746c7561662d74 x12: 0000000000000000
>   x11: ffff00080b7fbd98 x10: ffffffffffffffc0 x9 : ffffffffffffffff
>   x8 : 0000000000000228 x7 : 0000000000000e87 x6 : 0000000000000000
>   x5 : 0000000000000000 x4 : ffff00080a4ff280 x3 : 0000000000000000
>   x2 : ffff800082a40c04 x1 : 0000000000000000 x0 : ffff800082a40000
>   Call trace:
>    arm_smmu_write_s2cr+0x9c/0xbc (P)
>    arm_smmu_master_install_s2crs+0x78/0xa4
>    arm_smmu_attach_dev+0xb0/0x1d8
>    __iommu_device_set_domain+0x84/0x11c
>    __iommu_group_set_domain_internal+0x60/0x120
>    __iommu_attach_group+0x88/0x9c
>    iommu_attach_device+0x6c/0xa0
>    msm_iommu_new.part.0+0x84/0xe4 [msm]
>    msm_iommu_gpu_new+0x3c/0x104 [msm]
>    adreno_iommu_create_vm+0x24/0xc8 [msm]
>    a6xx_create_vm+0x48/0x78 [msm]
>    msm_gpu_init+0x2d8/0x508 [msm]
>    adreno_gpu_init+0x208/0x324 [msm]
>    a6xx_gpu_init+0x604/0x8cc [msm]
>    adreno_bind+0xb4/0x124 [msm]
>    component_bind_all+0x114/0x23c
>    msm_drm_init+0x1b0/0x1ec [msm]
>    msm_drm_bind+0x30/0x3c [msm]
>    try_to_bring_up_aggregate_device+0x164/0x1d0
>    __component_add+0xa4/0x16c
>    component_add+0x14/0x20
>    msm_dp_display_probe_tail+0x4c/0xac [msm]
>    msm_dp_auxbus_done_probe+0x14/0x20 [msm]
>    dp_aux_ep_probe+0x4c/0xf4 [drm_dp_aux_bus]
>    really_probe+0xbc/0x29c
>    __driver_probe_device+0x78/0x12c
>    driver_probe_device+0x3c/0x15c
>    __device_attach_driver+0xb8/0x134
>    bus_for_each_drv+0x88/0xe8
>    __device_attach+0xa0/0x190
>    device_initial_probe+0x50/0x54
>    bus_probe_device+0x38/0xa4
>    deferred_probe_work_func+0x88/0xc0
>    process_one_work+0x148/0x28c
>    worker_thread+0x2cc/0x3d4
>    kthread+0x12c/0x204
>    ret_from_fork+0x10/0x20
>   ---[ end trace 0000000000000000 ]---
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: qcom: purwa: Fix GPU IOMMU property
      commit: 4cd774c1feb3f720265c512174c5c3312eca1be2

Best regards,
-- 
Bjorn Andersson <andersson@xxxxxxxxxx>