drm_gem_objects_lookup does not use user space bo handles
directly and left the user to kernel copy work to a new
interface drm_gem_objects_lookup_user.
This is for driver like lima which does not pass gem bo
handles continously in an array in ioctl argument.
v2:
1. add drm_gem_objects_lookup_user
2. remove none-zero check as all caller will check before
calling this function
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Cc: Steven Price <steven.price@xxxxxxx>
Cc: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
Suggested-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Qiang Yu <yuq825@xxxxxxxxx>
---
drivers/gpu/drm/drm_gem.c | 57 +++++++++++++++++++------
drivers/gpu/drm/panfrost/panfrost_drv.c | 6 +--
include/drm/drm_gem.h | 4 +-
3 files changed, 49 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 6854f5867d51..a5e88c3e6d25 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -679,11 +679,11 @@ static int objects_lookup(struct drm_file *filp, u32 *handle, int count,
/**
* drm_gem_objects_lookup - look up GEM objects from an array of handles
* @filp: DRM file private date
- * @bo_handles: user pointer to array of userspace handle
+ * @bo_handles: array of GEM object handles
* @count: size of handle array
* @objs_out: returned pointer to array of drm_gem_object pointers
*
- * Takes an array of userspace handles and returns a newly allocated array of
+ * Takes an array of GEM object handles and returns a newly allocated array of
* GEM objects.
*
* For a single handle lookup, use drm_gem_object_lookup().
@@ -695,26 +695,56 @@ static int objects_lookup(struct drm_file *filp, u32 *handle, int count,
* failure. 0 is returned on success.
*
*/
-int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
+int drm_gem_objects_lookup(struct drm_file *filp, u32 *bo_handles,
int count, struct drm_gem_object ***objs_out)
{
int ret;
- u32 *handles;
struct drm_gem_object **objs;
- if (!count)
- return 0;
-
objs = kvmalloc_array(count, sizeof(struct drm_gem_object *),
GFP_KERNEL | __GFP_ZERO);
if (!objs)
return -ENOMEM;
+ ret = objects_lookup(filp, bo_handles, count, objs);
+ if (ret)
+ kvfree(objs);
+ else
+ *objs_out = objs;
+
+ return ret;
+
+}
+EXPORT_SYMBOL(drm_gem_objects_lookup);
+
+/**
+ * drm_gem_objects_lookup_user - look up GEM objects from an array of handles
+ * @filp: DRM file private date
+ * @bo_handles: user pointer to array of userspace handle
+ * @count: size of handle array
+ * @objs_out: returned pointer to array of drm_gem_object pointers
+ *
+ * Takes an array of userspace handles and returns a newly allocated array of
+ * GEM objects.
+ *
+ * For a single handle lookup, use drm_gem_object_lookup().
+ *
+ * Returns:
+ *
+ * @objs filled in with GEM object pointers. Returned GEM objects need to be
+ * released with drm_gem_object_put(). -ENOENT is returned on a lookup
+ * failure. 0 is returned on success.
+ *
+ */
+int drm_gem_objects_lookup_user(struct drm_file *filp, void __user *bo_handles,
+ int count, struct drm_gem_object ***objs_out)
+{
+ int ret;
+ u32 *handles;
+
handles = kvmalloc_array(count, sizeof(u32), GFP_KERNEL);
- if (!handles) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!handles)
+ return -ENOMEM;
if (copy_from_user(handles, bo_handles, count * sizeof(u32))) {
ret = -EFAULT;
@@ -722,15 +752,14 @@ int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
goto out;
}
- ret = objects_lookup(filp, handles, count, objs);
- *objs_out = objs;
+ ret = drm_gem_objects_lookup(filp, handles, count, objs_out);
out:
kvfree(handles);
return ret;
}
-EXPORT_SYMBOL(drm_gem_objects_lookup);
+EXPORT_SYMBOL(drm_gem_objects_lookup_user);
/**
* drm_gem_object_lookup - look up a GEM object from its handle
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index d74442d71048..486ca51d5662 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -130,9 +130,9 @@ panfrost_lookup_bos(struct drm_device *dev,
if (!job->implicit_fences)
return -ENOMEM;
- return drm_gem_objects_lookup(file_priv,
- (void __user *)(uintptr_t)args->bo_handles,
- job->bo_count, &job->bos);
+ return drm_gem_objects_lookup_user(file_priv,
+ (void __user *)(uintptr_t)args->bo_handles,
+ job->bo_count, &job->bos);
}
/**
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 6aaba14f5972..354fc8d240e4 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -387,8 +387,10 @@ struct page **drm_gem_get_pages(struct drm_gem_object *obj);
void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
bool dirty, bool accessed);
-int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
+int drm_gem_objects_lookup(struct drm_file *filp, u32 *bo_handles,
int count, struct drm_gem_object ***objs_out);
+int drm_gem_objects_lookup_user(struct drm_file *filp, void __user *bo_handles,
+ int count, struct drm_gem_object ***objs_out);
struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
bool wait_all, unsigned long timeout);
--
2.17.1
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