Test: smmu pmu and nvme conflict

[adamliyi]

If enable 'Smmu PMU' in BIOS, it may conflict with nvme, OS may fail to find rootfs on nvme disk.

Three patches are necessary to fix this issue:

1. torvalds/linux@52f3fab - backported to 5.4.y (87957b2). It is already on 5.10.y branch(52f3fab0067d') - "iommu/arm-smmu-v3: Don't reserve implementation defined register space"
2. AmpereComputing/ampere-centos-kernel---DEPRECATED@1164351: "perf/smmuv3: Allow sharing MMIO registers with the SMMU driver" (or: 779bed7502d9)
3. b1d2d3dd016f3: "ACPI/IORT: Fix PMCG node single ID mapping handling"

Tests shows, without patch: 'perf/smmuv3: Allow sharing MMIO registers with the SMMU driver', kernel will NOT boot.
Without the other two patches, kernel can still boot.

Test steps:

1. Enable Smmu PMU in BIOS
2. Revert patch: https://github.com/AmpereComputing/ampere-lts-kernel/commit/779bed7502d9 in 5.4 kernel
3. Build&install kernel and reboot
4. OS boot into initrd emergency shell (there is no /dev/nvme* device nodes)

[adamliyi]

This test case is manual test. Test script will only check for the 3 patches exists, e.g:

wget https://github.com/AmpereComputing/ampere-lts-kernel/commit/779bed7502d9.patch