closertotheheart
commented
2 years ago $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.4 LTS Release: 20.04 Codename: focal
running on $ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 39 bits physical, 48 bits virtual CPU(s): 12 On-line CPU(s) list: 0-11 Thread(s) per core: 2 Core(s) per socket: 6 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 158 Model name: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz Stepping: 10 CPU MHz: 3700.000 CPU max MHz: 4900.0000 CPU min MHz: 800.0000 BogoMIPS: 7399.70 Virtualization: VT-x L1d cache: 192 KiB L1i cache: 192 KiB L2 cache: 1.5 MiB L3 cache: 12 MiB NUMA node0 CPU(s): 0-11 Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable Vulnerability Meltdown: Mitigation; PTI Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2: Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling Vulnerability Srbds: Mitigation; Microcode Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_t sc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fau lt epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsav es dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d
$ cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.7 (Maipo) [mrcoyle@sequoia ~]$ uname -r 3.10.0-1062.el7.x86_64
running on
$ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 24 On-line CPU(s) list: 0-23 Thread(s) per core: 1 Core(s) per socket: 12 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 85 Model name: Intel(R) Xeon(R) Gold 6146 CPU @ 3.20GHz Stepping: 4 CPU MHz: 2356.054 CPU max MHz: 4200.0000 CPU min MHz: 1200.0000 BogoMIPS: 6400.00 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 1024K L3 cache: 25344K NUMA node0 CPU(s): 0-11 NUMA node1 CPU(s): 12-23 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb cat_l3 cdp_l3 intel_ppin intel_pt ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts pku ospke md_clear spec_ctrl intel_stibp flush_l1d
billfarrow
162676.233287] x86/PAT: pcimem:978227 conflicting memory types ca000000-ca800000 uncached-minus<->write-combining [162676.233289] x86/PAT: memtype_reserve failed [mem 0xca000000-0xca7fffff], track uncached-minus, req uncached-minus
Trying to access BAR0 of a Mellanox ConnectX-5. Works fine on RHEL 7.7.
On RHEL it appears the BAR is mapped much higher in memory (perhaps the BIOS has the above 4G flag set)? First time running the same logic on Ubuntu. Running on Ubuntu produces the error.
more /sys/devices/pci0000:00/0000:00:1b.4/0000:02:00.0/resource
0x00000000ca000000 0x00000000cbffffff 0x000000000014220c 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x00000000f7100000 0x00000000f71fffff 0x0000000000046200 0x00000000ce000000 0x00000000ceffffff 0x000000000014220c 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000
02:00.0 Ethernet controller: Mellanox Technologies MT28800 Family [ConnectX-5 Ex] Subsystem: Mellanox Technologies MT28800 Family [ConnectX-5 Ex] Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at ca000000 (64-bit, prefetchable) [size=32M] Expansion ROM at f7100000 [disabled] [size=1M] Capabilities: [60] Express Endpoint, MSI 00 Capabilities: [48] Vital Product Data Capabilities: [9c] MSI-X: Enable+ Count=64 Masked- Capabilities: [c0] Vendor Specific Information: Len=18 <?> Capabilities: [40] Power Management version 3 Capabilities: [100] Advanced Error Reporting Capabilities: [150] Alternative Routing-ID Interpretation (ARI) Capabilities: [180] Single Root I/O Virtualization (SR-IOV) Capabilities: [1c0] Secondary PCI Express Capabilities: [230] Access Control Services Capabilities: [320] Lane Margining at the Receiver <?> Capabilities: [370] Physical Layer 16.0 GT/s <?> Capabilities: [420] Data Link Feature <?> Kernel driver in use: mlx5_core