ANDROID: GKI: dma-buf: add vendor hook for dma_buf_release

The main function is to check whether the corresponding IOMMU buffer
is unmapped when dmabuf is released, so as to avoid memory coverage
caused by IOMMU.

Bug: 438090847
Change-Id: I56ae3f0994cd4f3d24494b7972e4d89d0f004da8
Signed-off-by: Gaofeng Sheng <gaofeng.sheng@unisoc.com>
(cherry picked from commit 8879650556ed747baf5a4d3037d687a76ccb986f)

drivers/android/vendor_hooks.c

@@ -584,6 +584,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_node);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_customize_thp_gfp_orders);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_customize_pmd_gfp_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_thp_vma_allowable_orders);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_dma_buf_release);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_cpuset_fork);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_uid);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_user);

drivers/dma-buf/dma-buf.c

@@ -33,6 +33,10 @@
 
 #include "dma-buf-sysfs-stats.h"
 
+#include <trace/hooks/dmabuf.h>
+#include <linux/android_kabi.h>
+ANDROID_KABI_DECLONLY(trace_eval_map);
+
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 static DEFINE_MUTEX(debugfs_list_mutex);
 static LIST_HEAD(debugfs_list);
@@ -126,6 +130,7 @@ static void dma_buf_release(struct dentry *dentry)
 	dma_buf_stats_teardown(dmabuf);
 	dmabuf->ops->release(dmabuf);
 
+	trace_android_vh_dma_buf_release(dmabuf);
 	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
 		dma_resv_fini(dmabuf->resv);
 

include/trace/hooks/dmabuf.h

@@ -29,6 +29,9 @@ DECLARE_HOOK(android_vh_dma_buf_attr_show_start,
 DECLARE_HOOK(android_vh_dma_buf_attr_show_end,
 		TP_PROTO(struct dma_buf *dmabuf),
 		TP_ARGS(dmabuf));
+DECLARE_HOOK(android_vh_dma_buf_release,
+		TP_PROTO(struct dma_buf *data),
+		TP_ARGS(data));
 #endif /* _TRACE_HOOK_DMABUF_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>