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>

4 files changed, 26 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/common/posix/nvgpu.c b/drivers/gpu/nvgpu/common/posix/nvgpu.c
index 6f2a5fe9..a275f2de 100644
--- a/drivers/gpu/nvgpu/common/posix/nvgpu.c
+++ b/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...
  */
diff --git a/drivers/gpu/nvgpu/include/nvgpu/os_sched.h b/drivers/gpu/nvgpu/include/nvgpu/os_sched.h
index 97dc9a57..d1e44b06 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/os_sched.h
+++ b/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__ */
diff --git a/drivers/gpu/nvgpu/os/linux/channel.c b/drivers/gpu/nvgpu/os/linux/channel.c
index e09939e9..cc2d525d 100644
--- a/drivers/gpu/nvgpu/os/linux/channel.c
+++ b/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",
-                                        current->comm);
+                                        "failed to host gk20a to submit gpfifo");
+                                nvgpu_print_current(g, NULL, NVGPU_ERROR);
                                 return err;
                         }
                 }
diff --git a/drivers/gpu/nvgpu/os/linux/os_sched.c b/drivers/gpu/nvgpu/os/linux/os_sched.c
index 586b35eb..9a25da18 100644
--- a/drivers/gpu/nvgpu/os/linux/os_sched.c
+++ b/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);
+}