linux-kernel - [PATCH] v3d: fixup for submit alignment and check for zero flags in other ioctls.

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Date:   Tue,  1 May 2018 10:58:45 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dave Airlie <airlied@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>
Subject: [PATCH] v3d: fixup for submit alignment and check for zero flags in other ioctls.

Signed-off-by: Eric Anholt <eric@...olt.net>
---

airlied + danvet: this is the last change I think we need before I can
merge v3d with your acks.  Sending as a diff so you don't have to look
at the whole thing again.  Look good?

 drivers/gpu/drm/v3d/v3d_bo.c  | 10 ++++++++++
 drivers/gpu/drm/v3d/v3d_gem.c |  5 +++++
 include/uapi/drm/v3d_drm.h    |  3 +++
 3 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c
index 2be4e8b71604..7b1e2a549a71 100644
--- a/drivers/gpu/drm/v3d/v3d_bo.c
+++ b/drivers/gpu/drm/v3d/v3d_bo.c
@@ -325,6 +325,11 @@ int v3d_create_bo_ioctl(struct drm_device *dev, void *data,
 	struct v3d_bo *bo = NULL;
 	int ret;
 
+	if (args->flags != 0) {
+		DRM_INFO("unknown create_bo flags: %d\n", args->flags);
+		return -EINVAL;
+	}
+
 	bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size));
 	if (IS_ERR(bo))
 		return PTR_ERR(bo);
@@ -344,6 +349,11 @@ int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data,
 	struct drm_gem_object *gem_obj;
 	int ret;
 
+	if (args->flags != 0) {
+		DRM_INFO("unknown mmap_bo flags: %d\n", args->flags);
+		return -EINVAL;
+	}
+
 	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 	if (!gem_obj) {
 		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index fa39a1e35263..b513f9189caf 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -503,6 +503,11 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 	struct drm_syncobj *sync_out;
 	int ret = 0;
 
+	if (args->pad != 0) {
+		DRM_INFO("pad must be zero: %d\n", args->pad);
+		return -EINVAL;
+	}
+
 	exec = kcalloc(1, sizeof(*exec), GFP_KERNEL);
 	if (!exec)
 		return -ENOMEM;
diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
index 201a07645bdd..7b6627783608 100644
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -101,6 +101,9 @@ struct drm_v3d_submit_cl {
 
 	/* Number of BO handles passed in (size is that times 4). */
 	__u32 bo_handle_count;
+
+	/* Pad, must be zero-filled. */
+	__u32 pad;
 };
 
 /**
-- 
2.17.0