drm/vc4: Warn if some v3d code is run on BCM2711

The BCM2711 has a separate driver for the v3d, and thus we can't call
into any of the driver entrypoints that rely on the v3d being there.

Let's add a bunch of checks and complain loudly if that ever happen.

Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220610115149.964394-15-maxime@cerno.tech

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
index 3ca16d682fc0..b8d856312846 100644
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -248,6 +248,9 @@ void vc4_bo_add_to_purgeable_pool(struct vc4_bo *bo)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return;
+
 	mutex_lock(&vc4->purgeable.lock);
 	list_add_tail(&bo->size_head, &vc4->purgeable.list);
 	vc4->purgeable.num++;
@@ -259,6 +262,9 @@ static void vc4_bo_remove_from_purgeable_pool_locked(struct vc4_bo *bo)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return;
+
 	/* list_del_init() is used here because the caller might release
 	 * the purgeable lock in order to acquire the madv one and update the
 	 * madv status.
@@ -387,6 +393,9 @@ struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_bo *bo;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return ERR_PTR(-ENODEV);
+
 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 	if (!bo)
 		return ERR_PTR(-ENOMEM);
@@ -413,6 +422,9 @@ struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
 	struct drm_gem_cma_object *cma_obj;
 	struct vc4_bo *bo;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return ERR_PTR(-ENODEV);
+
 	if (size == 0)
 		return ERR_PTR(-EINVAL);
 
@@ -475,9 +487,13 @@ int vc4_bo_dumb_create(struct drm_file *file_priv,
 		       struct drm_device *dev,
 		       struct drm_mode_create_dumb *args)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_bo *bo = NULL;
 	int ret;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	ret = vc4_dumb_fixup_args(args);
 	if (ret)
 		return ret;
@@ -598,8 +614,12 @@ static void vc4_bo_cache_time_work(struct work_struct *work)
 
 int vc4_bo_inc_usecnt(struct vc4_bo *bo)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 	int ret;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	/* Fast path: if the BO is already retained by someone, no need to
 	 * check the madv status.
 	 */
@@ -634,6 +654,11 @@ int vc4_bo_inc_usecnt(struct vc4_bo *bo)
 
 void vc4_bo_dec_usecnt(struct vc4_bo *bo)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
+
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return;
+
 	/* Fast path: if the BO is still retained by someone, no need to test
 	 * the madv value.
 	 */
@@ -753,6 +778,9 @@ int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
 	struct vc4_bo *bo = NULL;
 	int ret;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	ret = vc4_grab_bin_bo(vc4, vc4file);
 	if (ret)
 		return ret;
@@ -776,9 +804,13 @@ int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
 int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
 		      struct drm_file *file_priv)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_vc4_mmap_bo *args = data;
 	struct drm_gem_object *gem_obj;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	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);
@@ -802,6 +834,9 @@ vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
 	struct vc4_bo *bo = NULL;
 	int ret;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	if (args->size == 0)
 		return -EINVAL;
 
@@ -872,11 +907,15 @@ fail:
 int vc4_set_tiling_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_vc4_set_tiling *args = data;
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 	bool t_format;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	if (args->flags != 0)
 		return -EINVAL;
 
@@ -915,10 +954,14 @@ int vc4_set_tiling_ioctl(struct drm_device *dev, void *data,
 int vc4_get_tiling_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_vc4_get_tiling *args = data;
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	if (args->flags != 0 || args->modifier != 0)
 		return -EINVAL;
 
@@ -945,6 +988,9 @@ int vc4_bo_cache_init(struct drm_device *dev)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int i;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	/* Create the initial set of BO labels that the kernel will
 	 * use.  This lets us avoid a bunch of string reallocation in
 	 * the kernel's draw and BO allocation paths.
@@ -1004,6 +1050,9 @@ int vc4_label_bo_ioctl(struct drm_device *dev, void *data,
 	struct drm_gem_object *gem_obj;
 	int ret = 0, label;
 
+	if (WARN_ON_ONCE(vc4->is_vc5))
+		return -ENODEV;
+
 	if (!args->len)
 		return -EINVAL;