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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2019-02-08 17:11:25 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-12 10:40:30 +0100
commitc68cfb718c8f97b7f7a50ed66be5feb42d0c8988 (patch)
treea5958b14a9dde5a7cb48080f3b91e2bff615e594 /include/uapi/misc
parentf6f9279f2bf0e37e2f1fb119d8832b8568536a04 (diff)
misc: fastrpc: Add support for context Invoke method
This patch adds support to compute context invoke method on the remote processor (DSP). This involves setting up the functions input and output arguments, input and output handles and mapping the dmabuf fd for the argument/handle buffers. The below diagram depicts invocation of a single method where the client and objects reside on different processors. An object could expose multiple methods which can be grouped together and referred to as an interface. ,--------, ,------, ,-----------, ,------, ,--------, | | method | | | | | | method | | | Client |------->| Stub |->| Transport |->| Skel |------->| Object | | | | | | | | | | | `--------` `------` `-----------` `------` `--------` Client: Linux user mode process that initiates the remote invocation Stub: Auto generated code linked in with the user mode process that takes care of marshaling parameters Transport: Involved in carrying an invocation from a client to an object. This involves two portions: 1) FastRPC Linux kernel driver that receives the remote invocation, queues them up and then waits for the response after signaling the remote side. 2) Service running on the remote side that dequeues the messages from the queue and dispatches them for processing. Skel: Auto generated code that takes care of un-marshaling parameters Object: Method implementation Most of the work is derived from various downstream Qualcomm kernels. Credits to various Qualcomm authors who have contributed to this code. Specially Tharun Kumar Merugu <mtharu@codeaurora.org> Co-developed-by: Thierry Escande <thierry.escande@linaro.org> Signed-off-by: Thierry Escande <thierry.escande@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi/misc')
-rw-r--r--include/uapi/misc/fastrpc.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h
new file mode 100644
index 000000000000..a69ef33dc37e
--- /dev/null
+++ b/include/uapi/misc/fastrpc.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __QCOM_FASTRPC_H__
+#define __QCOM_FASTRPC_H__
+
+#include <linux/types.h>
+
+#define FASTRPC_IOCTL_INVOKE _IOWR('R', 3, struct fastrpc_invoke)
+
+struct fastrpc_invoke_args {
+ __u64 ptr;
+ __u64 length;
+ __s32 fd;
+ __u32 reserved;
+};
+
+struct fastrpc_invoke {
+ __u32 handle;
+ __u32 sc;
+ __u64 args;
+};
+
+#endif /* __QCOM_FASTRPC_H__ */