drm/syncobj: Add a reset ioctl (v3)

This just resets the dma_fence to NULL so it looks like it's never been
signaled.  This will be useful once we add the new wait API for allowing
wait on "submit and signal" behavior.

v2:
 - Take an array of sync objects (Dave Airlie)
v3:
 - Throw -EINVAL if pad != 0

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Christian König <christian.koenig@amd.com> (v1)
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 534e5ac43bf8..83f1615eb1ec 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -169,3 +169,5 @@ int drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_private);
 int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
                            struct drm_file *file_private);
+int drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
+                            struct drm_file *file_private);
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index b4f443417a28..16c5d51a43aa 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -659,6 +659,8 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
                       DRM_UNLOCKED|DRM_RENDER_ALLOW),
         DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
                       DRM_UNLOCKED|DRM_RENDER_ALLOW),
+        DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
+                      DRM_UNLOCKED|DRM_RENDER_ALLOW),
 };
 
 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 15e74ca61760..40d2ad293661 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -885,3 +885,36 @@ drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
 
         return ret;
 }
+
+int
+drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
+                        struct drm_file *file_private)
+{
+        struct drm_syncobj_array *args = data;
+        struct drm_syncobj **syncobjs;
+        uint32_t i;
+        int ret;
+
+        if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+                return -ENODEV;
+
+        if (args->pad != 0)
+                return -EINVAL;
+
+        if (args->count_handles == 0)
+                return -EINVAL;
+
+        ret = drm_syncobj_array_find(file_private,
+                                     u64_to_user_ptr(args->handles),
+                                     args->count_handles,
+                                     &syncobjs);
+        if (ret < 0)
+                return ret;
+
+        for (i = 0; i < args->count_handles; i++)
+                drm_syncobj_replace_fence(syncobjs[i], NULL);
+
+        drm_syncobj_array_free(syncobjs, args->count_handles);
+
+        return 0;
+}
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 4c746597225e..b037fdf9e43b 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -731,6 +731,12 @@ struct drm_syncobj_wait {
         __u32 pad;
 };
 
+struct drm_syncobj_array {
+        __u64 handles;
+        __u32 count_handles;
+        __u32 pad;
+};
+
 #if defined(__cplusplus)
 }
 #endif
@@ -854,6 +860,7 @@ extern "C" {
 #define DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD  DRM_IOWR(0xC1, struct drm_syncobj_handle)
 #define DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE  DRM_IOWR(0xC2, struct drm_syncobj_handle)
 #define DRM_IOCTL_SYNCOBJ_WAIT          DRM_IOWR(0xC3, struct drm_syncobj_wait)
+#define DRM_IOCTL_SYNCOBJ_RESET         DRM_IOWR(0xC4, struct drm_syncobj_array)
 
 /**
  * Device specific ioctls should only be in their respective headers