drm/xe: Skip address copy for sync-only execs

For parallel exec queues, xe_exec_ioctl() copied the batch buffer address
array from userspace without checking num_batch_buffer.
If user creates a sync-only exec that doesn't use the address field, the
exec will fail with -EFAULT.
Add num_batch_buffer check to skip the copy, and the exec could be executed
successfully.

Here is the sync-only exec:
struct drm_xe_exec exec = {
    .extensions = 0,
    .exec_queue_id = qid,
    .num_syncs = 1,
    .syncs = (uintptr_t)&sync,
    .address = 0,            /* ignored for sync-only */
    .num_batch_buffer = 0,   /* sync-only */
};

Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260122214053.3189366-2-shuicheng.lin@intel.com
(cherry picked from commit 4761791c1e736273d612ff564f318bfbbb04fa4e)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

diff --git a/drivers/gpu/drm/xe/xe_exec.c b/drivers/gpu/drm/xe/xe_exec.c
index fd9480031750694b80b605ef4b2668548cc9c2dd..8e3614b240107a63915dbbe0f8575989a70ced62 100644 (file)
--- a/drivers/gpu/drm/xe/xe_exec.c
+++ b/drivers/gpu/drm/xe/xe_exec.c
@@ -190,9 +190,9 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
                goto err_syncs;
        }
 
-       if (xe_exec_queue_is_parallel(q)) {
-               err = copy_from_user(addresses, addresses_user, sizeof(u64) *
-                                    q->width);
+       if (args->num_batch_buffer && xe_exec_queue_is_parallel(q)) {
+               err = copy_from_user(addresses, addresses_user,
+                                    sizeof(u64) * q->width);
                if (err) {
                        err = -EFAULT;
                        goto err_syncs;