Hi Kent and qian ,
According to the seL4 Reference Manual Version 12.1.0-dev , these APIs you mentioned below have been included. Please can you confirm that if you have made your formal validation of the SMMUv2 based on TX2 platform, which means the device driver of vm can apply dma request and the vmm can make the stage2 translation.
If so, I would be grateful if you could give more detailed information about the working example for SMMuv2.
-----邮件原件----- 发件人: Kent Mcleod [mailto:kent.mcleod72@gmail.com] 发送时间: 2022年7月12日 17:02 收件人: Tao Heng 陶恒-SW TaoHeng@saicmotor.com 抄送: devel@sel4.systems 主题: 【外部邮件】Re: [seL4] sel4 smmuv2.0 on tx2 related questions
On Mon, Jul 11, 2022 at 9:40 PM Tao Heng 陶恒-SW TaoHeng@saicmotor.com wrote:
Hi sel4-devs,
I have been trying to make some understandings of smmuv2.0 features provided by sel4. According to the vmm project for the tx2 platform, such as the vm_minimal apps, after all the compiling, there will be two caps,vm0_sid and vm0_cb,which is supposed to be used for stage2 address translation. My questions are as followed:
Which smmu device was the sid cap assigned to ?How were these two caps created in the cdl file? There seems no special configuration for Cmakes that is related to the caps.According to the tx2.dts, there are many sid numbers assigned to the smmu device. Why was there just one sid cap created by sel4?
There are 4 cap types for SMMUv2 that the kernel provides:
seL4_ARM_SIDControl (https://docs.sel4.systems/projects/sel4/api-doc.html#sel4_arm_sidcontrol): This cap is used to create caps for particular StreamIDs. seL4_ARM_SID (https://docs.sel4.systems/projects/sel4/api-doc.html#sel4_arm_sid): This cap type authorises directing a StreamID to a particular ContextBank. seL4_ARM_CBControl (https://docs.sel4.systems/projects/sel4/api-doc.html#sel4_arm_cbcontrol): This cap is used to create ContextBank caps that give access to specific context banks seL4_ARM_CB (https://docs.sel4.systems/projects/sel4/api-doc.html#sel4_arm_cb): This cap authorizes access to a specific context bank. It is used to associate a Context bank with a VSpace object and with a StreamID using the seL4_ARM_SID cap.
I'm not sure that a working example for SMMUv2 for the camkes-vm was merged. You're right that it looks like there's no way in Camkes to provide the SID and CB to actually give to the VM instance.
The TX2 itself has a static assignment of SIDs to devices and I don't think this can be changed. In addition there's some registers in the platform memory controller that need to be configured to actually turn on SMMU for each device, otherwise the memory transactions will bypass.
Kent.
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