Perf on MIPS debug kernel, unable to enable frame_pointer - linux-kernel

Question

I am trying to use perf tool for MIPS & facing some trouble in getting back-stacks.
How can I enable FRAME_POINTER for mips ? I have DEBUG_KERNEL enabled, but it looks like -fno-omit-frame-pointer is not applicable for MIPS arch in kernel.
Does it mean frame pointer based stack unwinding with perf can't be achieved for MIPS ?
I don't see mips toolchain complaining about -fno-omit-frame-pointer flag
EDIT1
I am able to record perf events. Sample output for perf report
Report wouldn't help much without the stack unwinding.
# ./perf --version
perf version 5.6.rc2.gd04712cd3bd7
# uname -a
Linux localhost 3.14.28-1.19 #1 SMP Mon Feb 17 16:48:44 IST 2020 mips GNU/Linux
EDIT2
Perf features detected
Auto-detecting system features:
... dwarf: [ on ]
... dwarf_getlocations: [ on ]
... glibc: [ on ]
... gtk2: [ OFF ]
... libaudit: [ on ]
... libbfd: [ OFF ]
... libcap: [ OFF ]
... libelf: [ on ]
... libnuma: [ OFF ]
... numa_num_possible_cpus: [ OFF ]
... libperl: [ OFF ]
... libpython: [ OFF ]
... libcrypto: [ OFF ]
... libunwind: [ OFF ]
... libdw-dwarf-unwind: [ on ]
... zlib: [ on ]
... lzma: [ on ]
... get_cpuid: [ OFF ]
... bpf: [ OFF ]
... libaio: [ on ]
... libzstd: [ OFF ]
... disassembler-four-args: [ OFF ]
EDIT3
I see feature test for libunwind had failed
cat linux-5.6-rc2/tools/build/feature/test-libunwind.make.output
/tmp/ccQnV5jZ.o: In function `main':
test-libunwind.c:(.text+0x1c): undefined reference to `_Umips_create_addr_space'
test-libunwind.c:(.text+0x4c): undefined reference to `_Umips_init_remote'
test-libunwind.c:(.text+0x70): undefined reference to `_Umips_dwarf_search_unwind_table'
collect2: error: ld returned 1 exit status
If I see the makefile for feature tests libunwind linking is not done for MIPS.
EDIT4
Usual workflow
perf record -F 99 -ag -e cycles:u -- sleep 5
perf report
Attempt to use dwarf
# perf record -F 99 -ag --call-graph=dwarf -- sleep 10
Error:
The sys_perf_event_open() syscall returned with 89 (Function not implemented) for event (cycles).
/bin/dmesg | grep -i perf may provide additional information.
dmesg is empty