From: Lucas Stach <l.stach@pengutronix.de>
Date: Fri, 24 Nov 2017 11:36:03 +0100
Subject: drm/etnaviv: refcount the submit object
Git-commit: e0329e6cfa6274ceb54d175b5e6ac19c00024c33
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The submit object lifetime will get extended to the actual GPU
execution. As multiple users will depend on this, add a kref to
properly control destruction of the object.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.h        |    3 +++
 drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c |   12 ++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -101,6 +101,7 @@ struct etnaviv_gem_submit_bo {
  * lasts for the duration of the submit-ioctl.
  */
 struct etnaviv_gem_submit {
+	struct kref refcount;
 	struct etnaviv_gpu *gpu;
 	struct dma_fence *out_fence, *in_fence;
 	u32 flags;
@@ -109,6 +110,8 @@ struct etnaviv_gem_submit {
 	/* No new members here, the previous one is variable-length! */
 };
 
+void etnaviv_submit_put(struct etnaviv_gem_submit * submit);
+
 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 	struct timespec *timeout);
 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -43,6 +43,7 @@ static struct etnaviv_gem_submit *submit
 		return NULL;
 
 	submit->gpu = gpu;
+	kref_init(&submit->refcount);
 
 	return submit;
 }
@@ -341,8 +342,10 @@ static int submit_perfmon_validate(struc
 	return 0;
 }
 
-static void submit_cleanup(struct etnaviv_gem_submit *submit)
+static void submit_cleanup(struct kref *kref)
 {
+	struct etnaviv_gem_submit *submit =
+			container_of(kref, struct etnaviv_gem_submit, refcount);
 	unsigned i;
 
 	for (i = 0; i < submit->nr_bos; i++) {
@@ -367,6 +370,11 @@ static void submit_cleanup(struct etnavi
 	kfree(submit);
 }
 
+void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
+{
+	kref_put(&submit->refcount, submit_cleanup);
+}
+
 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 		struct drm_file *file)
 {
@@ -544,7 +552,7 @@ int etnaviv_ioctl_gem_submit(struct drm_
 	args->fence = submit->out_fence->seqno;
 
 err_submit_objects:
-	submit_cleanup(submit);
+	etnaviv_submit_put(submit);
 
 err_submit_ww_acquire:
 	ww_acquire_fini(&ticket);