diff --git a/Documentation/driver-api/dma-buf.rst b/Documentation/driver-api/dma-buf.rst
index 05d856131140..f8f6decde359 100644
--- a/Documentation/driver-api/dma-buf.rst
+++ b/Documentation/driver-api/dma-buf.rst
@@ -133,6 +133,12 @@ DMA Fences
 .. kernel-doc:: drivers/dma-buf/dma-fence.c
    :doc: DMA fences overview
 
+DMA Fence Cross-Driver Contract
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+   :doc: fence cross-driver contract
+
 DMA Fence Signalling Annotations
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 0005bc002529..754e6fb84fb7 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -64,6 +64,47 @@ static atomic64_t dma_fence_context_counter = ATOMIC64_INIT(1);
  *   &dma_buf.resv pointer.
  */
 
+/**
+ * DOC: fence cross-driver contract
+ *
+ * Since &dma_fence provide a cross driver contract, all drivers must follow the
+ * same rules:
+ *
+ * * Fences must complete in a reasonable time. Fences which represent kernels
+ *   and shaders submitted by userspace, which could run forever, must be backed
+ *   up by timeout and gpu hang recovery code. Minimally that code must prevent
+ *   further command submission and force complete all in-flight fences, e.g.
+ *   when the driver or hardware do not support gpu reset, or if the gpu reset
+ *   failed for some reason. Ideally the driver supports gpu recovery which only
+ *   affects the offending userspace context, and no other userspace
+ *   submissions.
+ *
+ * * Drivers may have different ideas of what completion within a reasonable
+ *   time means. Some hang recovery code uses a fixed timeout, others a mix
+ *   between observing forward progress and increasingly strict timeouts.
+ *   Drivers should not try to second guess timeout handling of fences from
+ *   other drivers.
+ *
+ * * To ensure there's no deadlocks of dma_fence_wait() against other locks
+ *   drivers should annotate all code required to reach dma_fence_signal(),
+ *   which completes the fences, with dma_fence_begin_signalling() and
+ *   dma_fence_end_signalling().
+ *
+ * * Drivers are allowed to call dma_fence_wait() while holding dma_resv_lock().
+ *   This means any code required for fence completion cannot acquire a
+ *   &dma_resv lock. Note that this also pulls in the entire established
+ *   locking hierarchy around dma_resv_lock() and dma_resv_unlock().
+ *
+ * * Drivers are allowed to call dma_fence_wait() from their &shrinker
+ *   callbacks. This means any code required for fence completion cannot
+ *   allocate memory with GFP_KERNEL.
+ *
+ * * Drivers are allowed to call dma_fence_wait() from their &mmu_notifier
+ *   respectively &mmu_interval_notifier callbacks. This means any code required
+ *   for fence completeion cannot allocate memory with GFP_NOFS or GFP_NOIO.
+ *   Only GFP_ATOMIC is permissible, which might fail.
+ */
+
 static const char *dma_fence_stub_get_name(struct dma_fence *fence)
 {
         return "stub";
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 99c0a33c918d..51f0583ead19 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -35,6 +35,7 @@
 #include <linux/dma-resv.h>
 #include <linux/export.h>
 #include <linux/sched/mm.h>
+#include <linux/mmu_notifier.h>
 
 /**
  * DOC: Reservation Object Overview
@@ -115,6 +116,13 @@ static int __init dma_resv_lockdep(void)
 	if (ret == -EDEADLK)
 		dma_resv_lock_slow(&obj, &ctx);
 	fs_reclaim_acquire(GFP_KERNEL);
+#ifdef CONFIG_MMU_NOTIFIER
+	lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
+	__dma_fence_might_wait();
+	lock_map_release(&__mmu_notifier_invalidate_range_start_map);
+#else
+	__dma_fence_might_wait();
+#endif
 	fs_reclaim_release(GFP_KERNEL);
 	ww_mutex_unlock(&obj.lock);
 	ww_acquire_fini(&ctx);
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 3f288f7db2ef..09e23adb351d 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -360,6 +360,7 @@ dma_fence_get_rcu_safe(struct dma_fence __rcu **fencep)
 #ifdef CONFIG_LOCKDEP
 bool dma_fence_begin_signalling(void);
 void dma_fence_end_signalling(bool cookie);
+void __dma_fence_might_wait(void);
 #else
 static inline bool dma_fence_begin_signalling(void)
 {
