drm/lima: save process info for debug usage

When task fail, we can find its process with this information.

Tested-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200222024210.18697-2-yuq825@gmail.com

diff --git a/drivers/gpu/drm/lima/lima_ctx.c b/drivers/gpu/drm/lima/lima_ctx.c
index 22fff6c..891d5cd 100644 (file)
--- a/drivers/gpu/drm/lima/lima_ctx.c
+++ b/drivers/gpu/drm/lima/lima_ctx.c
@@ -27,6 +27,9 @@ int lima_ctx_create(struct lima_device *dev, struct lima_ctx_mgr *mgr, u32 *id)
        if (err < 0)
                goto err_out0;
 
+       ctx->pid = task_pid_nr(current);
+       get_task_comm(ctx->pname, current);
+
        return 0;
 
 err_out0:

diff --git a/drivers/gpu/drm/lima/lima_ctx.h b/drivers/gpu/drm/lima/lima_ctx.h
index 6154e5c..74e2be0 100644 (file)
--- a/drivers/gpu/drm/lima/lima_ctx.h
+++ b/drivers/gpu/drm/lima/lima_ctx.h
@@ -5,6 +5,7 @@
 #define __LIMA_CTX_H__
 
 #include <linux/xarray.h>
+#include <linux/sched.h>
 
 #include "lima_device.h"
 
@@ -13,6 +14,10 @@ struct lima_ctx {
        struct lima_device *dev;
        struct lima_sched_context context[lima_pipe_num];
        atomic_t guilty;
+
+       /* debug info */
+       char pname[TASK_COMM_LEN];
+       pid_t pid;
 };
 
 struct lima_ctx_mgr {