linux-kernel - [PATCH] drm/lima: Expose job_hang

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Date:   Thu, 18 Jun 2020 17:58:38 +0300
From:   Andrey Lebedev <andrey.lebedev@...il.com>
To:     Qiang Yu <yuq825@...il.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, lima@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     andrey@...edev.lt, kernel test robot <lkp@...el.com>
Subject: [PATCH] drm/lima: Expose job_hang_limit module parameter

From: Andrey Lebedev <andrey@...edev.lt>

Some pp or gp jobs can be successfully repeated even after they time outs.
Introduce lima module parameter to specify number of times a job can hang
before being dropped.

Signed-off-by: Andrey Lebedev <andrey@...edev.lt>
---

Fixes for the embarrassing build error
Reported-by: kernel test robot <lkp@...el.com>

 drivers/gpu/drm/lima/lima_drv.c   | 4 ++++
 drivers/gpu/drm/lima/lima_drv.h   | 1 +
 drivers/gpu/drm/lima/lima_sched.c | 5 +++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/lima/lima_drv.c b/drivers/gpu/drm/lima/lima_drv.c
index a831565af813..2400b8d52d92 100644
--- a/drivers/gpu/drm/lima/lima_drv.c
+++ b/drivers/gpu/drm/lima/lima_drv.c
@@ -19,6 +19,7 @@
 int lima_sched_timeout_ms;
 uint lima_heap_init_nr_pages = 8;
 uint lima_max_error_tasks;
+uint lima_job_hang_limit;
 
 MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms");
 module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);
@@ -29,6 +30,9 @@ module_param_named(heap_init_nr_pages, lima_heap_init_nr_pages, uint, 0444);
 MODULE_PARM_DESC(max_error_tasks, "max number of error tasks to save");
 module_param_named(max_error_tasks, lima_max_error_tasks, uint, 0644);
 
+MODULE_PARM_DESC(job_hang_limit, "number of times to allow a job to hang before dropping it (default 0)");
+module_param_named(job_hang_limit, lima_job_hang_limit, int, 0444);
+
 static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file)
 {
 	struct drm_lima_get_param *args = data;
diff --git a/drivers/gpu/drm/lima/lima_drv.h b/drivers/gpu/drm/lima/lima_drv.h
index fdbd4077c768..c738d288547b 100644
--- a/drivers/gpu/drm/lima/lima_drv.h
+++ b/drivers/gpu/drm/lima/lima_drv.h
@@ -11,6 +11,7 @@
 extern int lima_sched_timeout_ms;
 extern uint lima_heap_init_nr_pages;
 extern uint lima_max_error_tasks;
+extern uint lima_job_hang_limit;
 
 struct lima_vm;
 struct lima_bo;
diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
index e6cefda00279..1602985dfa04 100644
--- a/drivers/gpu/drm/lima/lima_sched.c
+++ b/drivers/gpu/drm/lima/lima_sched.c
@@ -503,8 +503,9 @@ int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
 
 	INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
 
-	return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0,
-			      msecs_to_jiffies(timeout), name);
+	return drm_sched_init(&pipe->base, &lima_sched_ops, 1,
+			      lima_job_hang_limit, msecs_to_jiffies(timeout),
+			      name);
 }
 
 void lima_sched_pipe_fini(struct lima_sched_pipe *pipe)
-- 
2.25.1