[PATCH v1 0/2] amdgpu/pm: Implement parallel sysfs_emit solution for vega10

[Darren Powell]

== Description ==
Scnprintf use within the kernel is not recommended, but simple sysfs_emit replacement has
not been successful due to the page alignment requirement of the function. This patch
set implements a new api "emit_clock_levels" to facilitate passing both the base and
offset to the device rather than just the write pointer.

The emit_clock_levels API for amdgpu_dpm has been duplicated to pp_dpm, based on the patch 
 commit 7f36948c92b2 ("amdgpu/pm: Implement new API function "emit" that accepts buffer base and write offset")
and vega10_emit_clock_levels has been implemented with sysfs_emit based on vega10_print_clock_levels


== Patch Summary ==
   linux: (git at gitlab.freedesktop.org:agd5f) origin/amd-staging-drm-next @ 6b6b9c625004
    + e94021f6c08c amdgpu/pm: Add new hwmgr API function "emit_clock_levels"
    + d83131987718 amdgpu/pm: Implement emit_clk_levels for vega10

== System Summary ==
* DESKTOP(AMD FX-8350 + VEGA10(687f/c3), BIOS: F2)
 + ISO(Ubuntu 20.04.4 LTS)
 + Kernel(5.16.0-20220307-fdoagd5f-g6b6b9c625004)
 + Overdrive Enabled(amdgpu.ppfeaturemask |= 0x4000)

== Test ==
AMDGPU_PCI_ADDR=`lspci -nn | grep "VGA\|Display" | cut -d " " -f 1`
AMDGPU_HWMON=`ls -la /sys/class/hwmon | grep $AMDGPU_PCI_ADDR | awk '{print $9}'`
HWMON_DIR=/sys/class/hwmon/${AMDGPU_HWMON}

lspci -nn | grep "VGA\|Display"  > $LOGFILE
printf 'OD enabled = %X\n' "$(( `cat /sys/module/amdgpu/parameters/ppfeaturemask` & 0x4000 ))" >> $LOGFILE
FILES="pp_od_clk_voltage
pp_dpm_sclk
pp_dpm_mclk
pp_dpm_pcie
pp_dpm_socclk
pp_dpm_fclk
pp_dpm_dcefclk
pp_dpm_vclk
pp_dpm_dclk "

for f in $FILES
do
  echo === $f === >> $LOGFILE
  cat $HWMON_DIR/device/$f >> $LOGFILE
done
cat $LOGFILE

Darren Powell (2):
  amdgpu/pm: Add new hwmgr API function "emit_clock_levels"
  amdgpu/pm: Implement emit_clk_levels for vega10

 .../gpu/drm/amd/pm/powerplay/amd_powerplay.c  |  17 ++
 .../drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c | 147 ++++++++++++++++++
 drivers/gpu/drm/amd/pm/powerplay/inc/hwmgr.h  |   2 +
 3 files changed, 166 insertions(+)


base-commit: 6b6b9c625004e07e000ca1918cadcb64439eb498
-- 
2.35.1