Export of dynamic-debug-exec-queries exists for users like drm.
This commit is a 1st user-test; it adds a 2nd knob, __drm_debug2, similar in function to __drm_debug. module_param_cb wires it to a callback which maps the input value to one of: "module=drm* +/-p".
The include is needed to see the exported function prototype.
Notes:
The define DEBUG at top of drm-printk enables all pr_debug()s, independent of CONFIG_DYNAMIC_DEBUG_CORE.
drm-printk is an independent print control system using __drm_debug bits. The plan is to find the low-level macros in which to insert a pr_debug call, their eventual callsites will have distinct METADATA, so will be itemized in control, and individually selectable.
Signed-off-by: Jim Cromie jim.cromie@gmail.com --- drivers/gpu/drm/drm_print.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index 111b932cf2a9..52abaf2ae053 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -27,6 +27,7 @@
#include <stdarg.h>
+#include <linux/dynamic_debug.h> #include <linux/io.h> #include <linux/moduleparam.h> #include <linux/seq_file.h> @@ -54,6 +55,40 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat "\t\tBit 8 (0x100) will enable DP messages (displayport code)"); module_param_named(debug, __drm_debug, int, 0600);
+/* POC for callback -> ddebug_exec_queries */ +unsigned int __drm_debug2; +EXPORT_SYMBOL(__drm_debug2); + +static int param_set_dyndbg(const char *val, const struct kernel_param *kp) +{ + int chgct, result; + + result = kstrtouint(val, 0, (unsigned int *)kp->arg); + pr_warn("set_dyndbg: result:%d from %s\n", result, val); + + if (result) + chgct = dynamic_debug_exec_queries("module=drm* +p", NULL); + else + chgct = dynamic_debug_exec_queries("module=drm* -p", NULL); + + pr_warn("change ct:%d\n", chgct); + return 0; +} +static int param_get_dyndbg(char *buffer, const struct kernel_param *kp) +{ + return scnprintf(buffer, PAGE_SIZE, "%u\n", + *((unsigned int *)kp->arg)); +} +static const struct kernel_param_ops param_ops_dyndbg = { + .set = param_set_dyndbg, + .get = param_get_dyndbg, +}; + +MODULE_PARM_DESC(debug_dyn, "Enable debug output, where each bit enables a debug category.\n" + "\t\tthese wont work yet\n"); +module_param_cb(debug_dyn, ¶m_ops_dyndbg, &__drm_debug2, 0644); + + void __drm_puts_coredump(struct drm_printer *p, const char *str) { struct drm_print_iterator *iterator = p->arg;