From: James Clark james.clark@arm.com
commit ea75a342aed5ed72c87f38fbe0df2f5df7eae374 upstream.
It's impossible to program a valid value for TRCCONFIGR.QE when TRCIDR0.QSUPP==0b10. In that case the following is true:
Q element support is implemented, and only supports Q elements without instruction counts. TRCCONFIGR.QE can only take the values 0b00 or 0b11.
Currently the low bit of QSUPP is checked to see if the low bit of QE can be written to, but as you can see when QSUPP==0b10 the low bit is cleared making it impossible to ever write the only valid value of 0b11 to QE. 0b10 would be written instead, which is a reserved QE value even for all values of QSUPP.
The fix is to allow writing the low bit of QE for any non zero value of QSUPP.
This change also ensures that the low bit is always set, even when the user attempts to only set the high bit.
Signed-off-by: James Clark james.clark@arm.com Reviewed-by: Mike Leach mike.leach@linaro.org Fixes: d8c66962084f ("coresight-etm4x: Controls pertaining to the reset, mode, pe and events") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220120113047.2839622-2-james.clark@arm.com Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -379,8 +379,12 @@ static ssize_t mode_store(struct device mode = ETM_MODE_QELEM(config->mode); /* start by clearing QE bits */ config->cfg &= ~(BIT(13) | BIT(14)); - /* if supported, Q elements with instruction counts are enabled */ - if ((mode & BIT(0)) && (drvdata->q_support & BIT(0))) + /* + * if supported, Q elements with instruction counts are enabled. + * Always set the low bit for any requested mode. Valid combos are + * 0b00, 0b01 and 0b11. + */ + if (mode && drvdata->q_support) config->cfg |= BIT(13); /* * if supported, Q elements with and without instruction