From 8145bbae35b75aafc9356dec426c29decbe7a5d8 Mon Sep 17 00:00:00 2001
From: Patrick Daly <quic_pdaly@quicinc.com>
Date: Mon, 9 May 2022 10:34:11 -0700
Subject: [PATCH] mem-buf: Add accessor for mem_buf_desc sgl list

Allow clients to see what IPA address a mem_buf object is
mapped to.

Change-Id: Ib3d47cb78bf7b1b217950e1e59b8d542abb3a331
Signed-off-by: Patrick Daly <quic_pdaly@quicinc.com>
---
 drivers/soc/qcom/mem_buf/mem-buf-gh.c | 8 ++++++++
 include/linux/mem-buf.h               | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/soc/qcom/mem_buf/mem-buf-gh.c b/drivers/soc/qcom/mem_buf/mem-buf-gh.c
index 6bbd10ba1777..a5b56f4b41dd 100644
--- a/drivers/soc/qcom/mem_buf/mem-buf-gh.c
+++ b/drivers/soc/qcom/mem_buf/mem-buf-gh.c
@@ -1145,6 +1145,14 @@ static int get_mem_buf(void *membuf_desc)
 	return 0;
 }
 
+struct gh_sgl_desc *mem_buf_get_sgl(void *__membuf)
+{
+	struct mem_buf_desc *membuf = __membuf;
+
+	return membuf->sgl_desc;
+}
+EXPORT_SYMBOL(mem_buf_get_sgl);
+
 static void mem_buf_retrieve_release(struct qcom_sg_buffer *buffer)
 {
 	sg_free_table(&buffer->sg_table);
diff --git a/include/linux/mem-buf.h b/include/linux/mem-buf.h
index f9e1ecb07b3f..3f69e1d9755a 100644
--- a/include/linux/mem-buf.h
+++ b/include/linux/mem-buf.h
@@ -104,6 +104,7 @@ void mem_buf_put(void *membuf_desc);
 
 void *mem_buf_get(int fd);
 
+struct gh_sgl_desc *mem_buf_get_sgl(void *membuf);
 #else
 
 static inline int mem_buf_get_fd(void *membuf_desc)
@@ -120,5 +121,9 @@ static inline void *mem_buf_get(int fd)
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct gh_sgl_desc *mem_buf_get_sgl(void *membuf)
+{
+	return ERR_PTR(-EINVAL);
+}
 #endif /* CONFIG_QCOM_MEM_BUF */
 #endif /* _MEM_BUF_H */