gpu: nvgpu: add API to print process name

Add an OS-abstracted API for printing the name of the current process
into a log message and convert the single occurrence of current->comm in
submit path power failure to use it.

Jira NVGPU-705

Change-Id: I1a509dcc5aecc3c89ce4582733888081b3e38f1f
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1749833
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/posix/nvgpu.c

@@ -67,6 +67,13 @@ int nvgpu_current_tid(struct gk20a *g)
 	return (int)pthread_self();
 }
 
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+		void *ctx, enum nvgpu_log_type type)
+{
+	__nvgpu_log_msg(g, func_name, line, type,
+			"Current process: (nvgpu userspace)");
+}
+
 /*
  * Somewhat meaningless in userspace...
  */

drivers/gpu/nvgpu/include/nvgpu/os_sched.h

@@ -23,6 +23,8 @@
 #ifndef __NVGPU_OS_SCHED_H__
 #define __NVGPU_OS_SCHED_H__
 
+#include <nvgpu/log.h>
+
 struct gk20a;
 
 /**
@@ -37,4 +39,13 @@ int nvgpu_current_tid(struct gk20a *g);
  */
 int nvgpu_current_pid(struct gk20a *g);
 
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+		void *ctx, enum nvgpu_log_type type);
+/**
+ * nvgpu_print_current - print the name of current calling process
+ *
+ */
+#define nvgpu_print_current(g, ctx, type) \
+	__nvgpu_print_current(g, __func__, __LINE__, ctx, type)
+
 #endif /* __NVGPU_OS_SCHED_H__ */

drivers/gpu/nvgpu/os/linux/channel.c

@@ -890,8 +890,8 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
 			err = gk20a_busy(g);
 			if (err) {
 				nvgpu_err(g,
-					"failed to host gk20a to submit gpfifo, process %s",
+					"failed to host gk20a to submit gpfifo");
-					current->comm);
+				nvgpu_print_current(g, NULL, NVGPU_ERROR);
 				return err;
 			}
 		}

drivers/gpu/nvgpu/os/linux/os_sched.c

@@ -24,3 +24,9 @@ int nvgpu_current_pid(struct gk20a *g)
 {
 	return current->tgid;
 }
+
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+		void *ctx, enum nvgpu_log_type type)
+{
+	__nvgpu_log_msg(g, func_name, line, type, current->comm);
+}