资源分配问题分析过程：
1.在shell下和OS都能复制到现象；
2.测试CRB BIOS，发现CRB BIOS在shell下没有复制到现象，在OS下复制到现象；
3.比较Aoqin BIOS和CRB BIOS，发现在setup里面把PCIe SR-IOV disable，shell下就能正常分配到Region0/2的资源；---- 看来跟PCIe SR-IOV功能有关
4.Region0/2的资源是MMIO32类型的，Ampere平台给每个RC预留的MMIO32的资源一共是128MB（Ampere的代码里面有定义）；同时Tencent反馈摇光卡默认支持SR-IOV功能，仅该功能就需要申请128MB的MMIO32资源，从而导致我们的MMIO32资源不够。
5.但是把PCIe SR-IOV disable后进OS还是分配不到Region0/2的资源，是因为linux系统默认也是支持SR-IOV功能的(如果要在OS下也能正确分配资源，需要在OS里面把PCIe SR-IOV disable)。
6.最终的解决方案是摇光卡固件里面把PCIe SR-IOV功能disable。
问题：
接上PCIe设备之后，不能开机，log看到是pcie资源fail。
结论：
把SR-IOV [disable]后，可以开机，能认到设备。
问题：
接上PCIe卡之后，hang机，post log显示pci 资源分配失败，OUT_OF_RESOURCE
现象：
1.在BIOS里面把SR-IOV disable之后，可以开机，进shell看设备资源分配正常；
2.但是进OS之后发现BAR0/2没有分配到资源，BAR4分配到资源
3.修改pcie卡的FW，disable 卡的SR-IOV，卡工作正常
分析：
卡本身需要的资源：BAR0需要MMIO32, BAR2需要MMIO32, BAR4需要MMIO64 ,如果开启SRIOV，VF也需要MMIO32的资源。
BIOS里面定义了（某个RC）的MMIO32资源只有128MB，而仅仅VF 需要的资源就需要 16MB*8个VF=128MB，从而导致bar0、2分配不到资源。
[ 10.234281] pci 000a:03:00.0: [1ea0:2a18] type 00 class 0x008004 [ 10.234311] pci 000a:03:00.0: reg 0x10: [mem 0x50800000-0x50800fff] [ 10.234325] pci 000a:03:00.0: reg 0x18: [mem 0x50000000-0x507fffff] [ 10.234344] pci 000a:03:00.0: reg 0x20: [mem 0x680000000000-0x6801ffffffff 64bit pref] [ 10.234358] pci 000a:03:00.0: enabling Extended Tags [ 10.239404] pci 000a:03:00.0: supports D1 D2 [ 10.239405] pci 000a:03:00.0: PME# supported from D0 D1 D2 D3hot D3cold [ 10.239438] pci 000a:03:00.0: reg 0x164: [mem 0x00000000-0x0000ffff] [ 10.239441] pci 000a:03:00.0: VF(n) BAR0 space: [mem 0x00000000-0x0007ffff] (contains BAR0 for 8 VFs) [ 10.248658] pci 000a:03:00.0: reg 0x16c: [mem 0x00000000-0x00ffffff] [ 10.248659] pci 000a:03:00.0: VF(n) BAR2 space: [mem 0x00000000-0x07ffffff] (contains BAR2 for 8 VFs) [ 10.257890] pci 000a:03:00.0: reg 0x174: [mem 0x00000000-0x1ffffffff 64bit pref] [ 10.257892] pci 000a:03:00.0: VF(n) BAR4 space: [mem 0x00000000-0xfffffffff 64bit pref] (contains BAR4 for 8 VFs) [ 10.268210] pci 000a:03:00.0: 16.000 Gb/s available PCIe bandwidth, limited by 5 GT/s x4 link at 000a:00:05.0 (capable of 63.012 Gb/s with 16 GT/s x4 link) [ 10.282183] pci_bus 000a:00: on NUMA node 1 [ 10.282190] pci 000a:00:05.0: BAR 15: assigned [mem 0x680000000000-0x6811ffffffff 64bit pref] [ 10.290700] pci 000a:00:05.0: BAR 14: no space for [mem size 0x08c00000] [ 10.297397] pci 000a:00:05.0: BAR 14: failed to assign [mem size 0x08c00000] [ 10.304431] pci 000a:00:01.0: BAR 14: assigned [mem 0x50000000-0x501fffff] [ 10.311293] pci 000a:00:01.0: BAR 15: assigned [mem 0x681200000000-0x6812001fffff 64bit pref] [ 10.319802] pci 000a:00:03.0: BAR 14: assigned [mem 0x50200000-0x503fffff] [ 10.326672] pci 000a:00:03.0: BAR 15: assigned [mem 0x681200200000-0x6812003fffff 64bit pref] [ 10.335182] pci 000a:00:01.0: BAR 13: no space for [io size 0x1000] [ 10.341525] pci 000a:00:01.0: BAR 13: failed to assign [io size 0x1000] [ 10.348212] pci 000a:00:03.0: BAR 13: no space for [io size 0x1000] [ 10.354561] pci 000a:00:03.0: BAR 13: failed to assign [io size 0x1000] [ 10.361247] pci 000a:00:05.0: BAR 13: no space for [io size 0x1000] [ 10.367596] pci 000a:00:05.0: BAR 13: failed to assign [io size 0x1000] [ 10.374283] pci 000a:00:01.0: PCI bridge to [bus 01] [ 10.379241] pci 000a:00:01.0: bridge window [mem 0x50000000-0x501fffff] [ 10.386016] pci 000a:00:01.0: bridge window [mem 0x681200000000-0x6812001fffff 64bit pref] [ 10.394450] pci 000a:00:03.0: PCI bridge to [bus 02] [ 10.399403] pci 000a:00:03.0: bridge window [mem 0x50200000-0x503fffff] [ 10.406187] pci 000a:00:03.0: bridge window [mem 0x681200200000-0x6812003fffff 64bit pref] [ 10.414613] pci 000a:03:00.0: BAR 4: assigned [mem 0x680000000000-0x6801ffffffff 64bit pref] [ 10.423052] pci 000a:03:00.0: BAR 11: assigned [mem 0x680200000000-0x6811ffffffff 64bit pref] [ 10.431566] pci 000a:03:00.0: BAR 9: no space for [mem size 0x08000000] [ 10.438176] pci 000a:03:00.0: BAR 9: failed to assign [mem size 0x08000000] [ 10.445124] pci 000a:03:00.0: BAR 2: no space for [mem size 0x00800000] [ 10.451725] pci 000a:03:00.0: BAR 2: failed to assign [mem size 0x00800000] [ 10.458673] pci 000a:03:00.0: BAR 7: no space for [mem size 0x00080000] [ 10.465283] pci 000a:03:00.0: BAR 7: failed to assign [mem size 0x00080000] [ 10.472230] pci 000a:03:00.0: BAR 0: no space for [mem size 0x00001000] [ 10.478839] pci 000a:03:00.0: BAR 0: failed to assign [mem size 0x00001000] [ 10.485787] pci 000a:00:05.0: PCI bridge to [bus 03] [ 10.490747] pci 000a:00:05.0: bridge window [mem 0x680000000000-0x6811ffffffff 64bit pref]
BIOS可以正常分配资源（因为BIOS里面把SRIOV disable了）
进OS之后，OS会重新给卡分配资源，这时Linux检测到卡支持SRIOV，所以会分配VF资源，最终导致资源不够。
（如果是windows的话可能就不会再去分配了，直接使用BIOS分配的）
Region 0: Memory at <ignored> (32-bit, non-prefetchable) [disabled] Region 2: Memory at <ignored> (32-bit, non-prefetchable) [disabled] Region 4: Memory at 680000000000 (64-bit, prefetchable) [disabled] [size=8G]
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