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authorChristian König <christian.koenig@amd.com>2021-05-06 14:16:01 +0200
committerChristian König <christian.koenig@amd.com>2021-06-04 14:04:59 +0200
commit0c6b522abc2a592468992780babd3c3629c7ceac (patch)
tree91c506b02a3b2db54295638d92eb2c1a3e6247b2 /drivers/dma-buf
parent068d9d754bc15f30ff2f73b9f50aba85420a08b2 (diff)
dma-buf: cleanup dma-resv shared fence debugging a bit v2
Make that a function instead of inline. v2: improve the kerneldoc wording as suggested by Daniel Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20210602111714.212426-3-christian.koenig@amd.com
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-resv.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 87f5d82d992a..3964df438505 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -208,6 +208,26 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
}
EXPORT_SYMBOL(dma_resv_reserve_shared);
+#ifdef CONFIG_DEBUG_MUTEXES
+/**
+ * dma_resv_reset_shared_max - reset shared fences for debugging
+ * @obj: the dma_resv object to reset
+ *
+ * Reset the number of pre-reserved shared slots to test that drivers do
+ * correct slot allocation using dma_resv_reserve_shared(). See also
+ * &dma_resv_list.shared_max.
+ */
+void dma_resv_reset_shared_max(struct dma_resv *obj)
+{
+ /* Test shared fence slot reservation */
+ if (rcu_access_pointer(obj->fence)) {
+ struct dma_resv_list *fence = dma_resv_get_list(obj);
+
+ fence->shared_max = fence->shared_count;
+ }
+}
+#endif
+
/**
* dma_resv_add_shared_fence - Add a fence to a shared slot
* @obj: the reservation object