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coresight: cpu-debug: Control default behavior via Kconfig 

Debugfs is nice and so are module parameters, but
 * debugfs doesn't take effect early (e.g., if drivers are locking up
   before user space gets anywhere)
 * module parameters either add a lot to the kernel command line, or
   else take effect late as well (if you build =m and configure in
   /etc/modprobe.d/)

So in the same spirit as these
  CONFIG_PANIC_ON_OOPS (also available via cmdline or modparam)
  CONFIG_INTEL_IOMMU_DEFAULT_ON (also available via cmdline)
add a new Kconfig option.

Module parameters and debugfs can still override.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
[Fixed missing double quote in Kconfig title]
Link: https://lore.kernel.org/r/20210903182839.1.I20856983f2841b78936134dcf9cdf6ecafe632b9@changeid
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Brian Norris 2021-09-03 18:28:54 -07:00 committed by Mathieu Poirier
parent 692c9a499b
commit 204879e699
2 changed files with 14 additions and 1 deletions
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13
drivers/hwtracing/coresight/Kconfig
View File

@ -150,6 +150,19 @@ config CORESIGHT_CPU_DEBUG
To compile this driver as a module, choose M here: the
module will be called coresight-cpu-debug.
config CORESIGHT_CPU_DEBUG_DEFAULT_ON
bool "Enable CoreSight CPU Debug by default"
depends on CORESIGHT_CPU_DEBUG
help
Say Y here to enable the CoreSight Debug panic-debug by default. This
can also be enabled via debugfs, but this ensures the debug feature
is enabled as early as possible.
Has the same effect as setting coresight_cpu_debug.enable=1 on the
kernel command line.
Say N if unsure.
config CORESIGHT_CTI
tristate "CoreSight Cross Trigger Interface (CTI) driver"
depends on ARM || ARM64

2
drivers/hwtracing/coresight/coresight-cpu-debug.c
View File

@ -105,7 +105,7 @@ static DEFINE_PER_CPU(struct debug_drvdata *, debug_drvdata);
static int debug_count;
static struct dentry *debug_debugfs_dir;
static bool debug_enable;
static bool debug_enable = IS_ENABLED(CONFIG_CORESIGHT_CPU_DEBUG_DEFAULT_ON);
module_param_named(enable, debug_enable, bool, 0600);
MODULE_PARM_DESC(enable, "Control to enable coresight CPU debug functionality");