[PATCH v2 06/17] drm/v3d: Decouple job allocation from job initiation

[Maíra Canal]

We want to allow the IOCTLs to allocate the job without initiating it.
This will be useful for the CPU job submission IOCTL, as the CPU job has
the need to use information from the user extensions. Currently, the
user extensions are parsed before the job allocation, making it
impossible to fill the CPU job when parsing the user extensions.
Therefore, decouple the job allocation from the job initiation.

Signed-off-by: Maíra Canal <mcanal at igalia.com>
---
 drivers/gpu/drm/v3d/v3d_submit.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_submit.c b/drivers/gpu/drm/v3d/v3d_submit.c
index fe46dd316ca0..ed1a310bbd2f 100644
--- a/drivers/gpu/drm/v3d/v3d_submit.c
+++ b/drivers/gpu/drm/v3d/v3d_submit.c
@@ -135,6 +135,21 @@ void v3d_job_put(struct v3d_job *job)
 	kref_put(&job->refcount, job->free);
 }
 
+static int
+v3d_job_allocate(void **container, size_t size)
+{
+	if (*container)
+		return 0;
+
+	*container = kcalloc(1, size, GFP_KERNEL);
+	if (!*container) {
+		DRM_ERROR("Cannot allocate memory for V3D job.\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
 static int
 v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 	     void **container, size_t size, void (*free)(struct kref *ref),
@@ -145,11 +160,9 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 	bool has_multisync = se && (se->flags & DRM_V3D_EXT_ID_MULTI_SYNC);
 	int ret, i;
 
-	*container = kcalloc(1, size, GFP_KERNEL);
-	if (!*container) {
-		DRM_ERROR("Cannot allocate memory for v3d job.");
-		return -ENOMEM;
-	}
+	ret = v3d_job_allocate(container, size);
+	if (ret)
+		return ret;
 
 	job = *container;
 	job->v3d = v3d;
-- 
2.41.0