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

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

[Akhil P Oommen]

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 ]---

Fixes: 1aa0b4e36436 ("arm64: dts: qcom: x1p42100: Add GPU support")
Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/purwa.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/purwa.dtsi b/arch/arm64/boot/dts/qcom/purwa.dtsi
index 9ab4f26b35f298ad7c6c361b3e232edf07baf223..5b17840fb62fb2e664837b125d0ed5cf8b272326 100644
--- a/arch/arm64/boot/dts/qcom/purwa.dtsi
+++ b/arch/arm64/boot/dts/qcom/purwa.dtsi
@@ -47,6 +47,8 @@ &gmu {
 &gpu {
 	compatible = "qcom,adreno-43030c00", "qcom,adreno";
 
+	iommus = <&adreno_smmu 0 0x0>;
+
 	nvmem-cells = <&gpu_speed_bin>;
 	nvmem-cell-names = "speed_bin";
 

---
base-commit: 0190c2c6dae368aeb9bf59a449ebe23f24bfa059
change-id: 20260409-purwa-gpu-dt-fix-278642bce2be

Best regards,
-- 
Akhil P Oommen <akhilpo@oss.qualcomm.com>

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

[Konrad Dybcio]

On 4/9/26 11:08 PM, 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:

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad