Add support for inference cancellation

Send cancel inference messages to the ethosu subsystem to abort
inference execution there.  Also mark inference as aborted in the
linux driver stack itself, so pending inference messages are not
resent when resetting the firmware.

Change-Id: I244c2b119fd7995d14e3859815abf2a00c7f0583

1 files changed, 72 insertions, 0 deletions

diff --git a/kernel/ethosu_cancel_inference.h b/kernel/ethosu_cancel_inference.h
new file mode 100644
index 0000000..94d9fe1
--- /dev/null
+++ b/kernel/ethosu_cancel_inference.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2022 ARM Limited.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ */
+
+#ifndef ETHOSU_CANCEL_INFERENCE_H
+#define ETHOSU_CANCEL_INFERENCE_H
+
+/****************************************************************************
+ * Includes
+ ****************************************************************************/
+
+#include "ethosu_mailbox.h"
+#include "uapi/ethosu.h"
+
+#include <linux/kref.h>
+#include <linux/types.h>
+#include <linux/completion.h>
+
+/****************************************************************************
+ * Types
+ ****************************************************************************/
+
+struct ethosu_core_cancel_inference_rsp;
+struct ethosu_device;
+struct ethosu_uapi_cancel_inference_status;
+struct ethosu_inference;
+
+struct ethosu_cancel_inference {
+	struct ethosu_device                       *edev;
+	struct ethosu_inference                    *inf;
+	struct ethosu_uapi_cancel_inference_status *uapi;
+	struct kref                                kref;
+	struct completion                          done;
+	struct ethosu_mailbox_msg                  msg;
+	int                                        errno;
+};
+
+/****************************************************************************
+ * Functions
+ ****************************************************************************/
+
+/**
+ * ethosu_cancel_inference_request() - Send cancel inference request
+ *
+ * Return: 0 on success, error code otherwise.
+ */
+int ethosu_cancel_inference_request(struct ethosu_inference *inf,
+				    struct ethosu_uapi_cancel_inference_status *uapi);
+
+/**
+ * ethosu_cancel_inference_rsp() - Handle cancel inference response
+ */
+void ethosu_cancel_inference_rsp(struct ethosu_device *edev,
+				 struct ethosu_core_cancel_inference_rsp *rsp);
+
+#endif /* ETHOSU_CANCEL_INFERENCE_H */