[PATCH 0/3] RISC-V tracing support

[Pragnesh Patel]

This series add a support of tracing for RISC-V arch.

This series is also available here [1] for testing.
Series depends on [2].

[1] https://github.com/pragnesh26992/u-boot/tree/trace
[2] https://patchwork.ozlabs.org/project/uboot/cover/20200729095636.1077054-1-seanga2@gmail.com/

How to test this patch:
1) Enable tracing in "configs/sifive_fu540_defconfig"
CONFIG_TRACE=y
CONFIG_TRACE_BUFFER_SIZE=0x01000000
CONFIG_TRACE_CALL_DEPTH_LIMIT=15
CONFIG_CMD_TRACE=y

2) make FTRACE=1 sifive_fu540_defconfig
3) make FTRACE=1

Following are the boot messages on FU540 five cores SMP platform:

U-Boot 2020.10-rc1-02837-g8613dc2e66 (Aug 24 2020 - 20:03:47 +0530)

CPU:   rv64imac
Model: SiFive HiFive Unleashed A00
DRAM:  8 GiB
trace: enabled
MMC:   spi at 10050000:mmc at 0: 0
Loading Environment from SPIFlash... SF: Detected is25wp256 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
OK
In:    serial at 10010000
Out:   serial at 10010000
Err:   serial at 10010000
Board serial number should not be 0 !!
Net:
Warning: ethernet at 10090000 (eth0) using random MAC address - 92:a1:a7:02:5a:14
eth0: ethernet at 10090000
Hit any key to stop autoboot:  0
=> trace stats
        177,722 function sites
     37,057,350 function calls
              1 untracked function calls
      1,279,612 traced function calls (36015585 dropped due to overflow)
             19 maximum observed call depth
             15 call depth limit
     37,055,565 calls not traced due to depth
=>


Pragnesh Patel (3):
  riscv: Add timer_get_us() for tracing
  riscv: Mark riscv_timer_get_count() and sifive_clint_get_count() with
    'notrace'
  riscv: Mark andes_plmt_get_count() with 'notrace'

 arch/riscv/lib/Makefile       |  1 +
 arch/riscv/lib/andes_plmt.c   |  2 +-
 arch/riscv/lib/sifive_clint.c |  2 +-
 arch/riscv/lib/timer.c        | 50 +++++++++++++++++++++++++++++++++++
 drivers/timer/riscv_timer.c   |  2 +-
 5 files changed, 54 insertions(+), 3 deletions(-)
 create mode 100644 arch/riscv/lib/timer.c

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2.17.1