Restructure kernel driver source tree

As a first step to have a clearer separation of the different parts of
the kernel driver, the source files have been placed into separate
directories according to their purpose and the different parts are only
allowed to use headers from another part in the include folder.

Files have been renamed accordingly to namespace them by their purpose.

Change-Id: I75e09ebf0002c99a22b6d4b09d34504d186c32b3
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>

1 files changed, 191 insertions, 0 deletions

diff --git a/kernel/rpmsg/ethosu_rpmsg_cancel_inference.c b/kernel/rpmsg/ethosu_rpmsg_cancel_inference.c
new file mode 100644
index 0000000..5d46434
--- /dev/null
+++ b/kernel/rpmsg/ethosu_rpmsg_cancel_inference.c
@@ -0,0 +1,191 @@
+/*
+ * SPDX-FileCopyrightText: Copyright 2022-2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * 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.
+ *
+ */
+
+/****************************************************************************
+ * Includes
+ ****************************************************************************/
+
+#include <rpmsg/ethosu_rpmsg_cancel_inference.h>
+
+#include <common/ethosu_device.h>
+#include <rpmsg/ethosu_rpmsg.h>
+#include <rpmsg/ethosu_rpmsg_inference.h>
+
+#include <linux/remoteproc.h>
+#include <linux/wait.h>
+
+/****************************************************************************
+ * Defines
+ ****************************************************************************/
+
+#define CANCEL_INFERENCE_RESP_TIMEOUT_MS 2000
+
+/****************************************************************************
+ * Functions
+ ****************************************************************************/
+
+static int ethosu_cancel_inference_send(
+	struct ethosu_cancel_inference *cancellation,
+	struct ethosu_mailbox *mailbox)
+{
+	return ethosu_mailbox_cancel_inference(mailbox,
+					       &cancellation->msg,
+					       cancellation->inf->msg.id);
+}
+
+static void ethosu_cancel_inference_fail(struct ethosu_mailbox_msg *msg)
+{
+	struct ethosu_cancel_inference *cancellation =
+		container_of(msg, typeof(*cancellation), msg);
+
+	if (completion_done(&cancellation->done))
+		return;
+
+	cancellation->errno = -EFAULT;
+	cancellation->uapi->status = ETHOSU_UAPI_STATUS_ERROR;
+	complete(&cancellation->done);
+}
+
+int ethosu_cancel_inference_request(struct device *dev,
+				    struct ethosu_mailbox *mailbox,
+				    struct ethosu_inference *inf,
+				    struct ethosu_uapi_cancel_inference_status *uapi)
+{
+	struct ethosu_cancel_inference *cancellation;
+	int ret;
+	int timeout;
+
+	if (inf->done) {
+		uapi->status = ETHOSU_UAPI_STATUS_ERROR;
+
+		return 0;
+	}
+
+	cancellation =
+		devm_kzalloc(dev,
+			     sizeof(struct ethosu_cancel_inference),
+			     GFP_KERNEL);
+	if (!cancellation)
+		return -ENOMEM;
+
+	/* increase ref count on the inference we are refering to */
+	ethosu_inference_get(inf);
+	/* mark inference ABORTING to avoid resending the inference message */
+	inf->status = ETHOSU_UAPI_STATUS_ABORTING;
+
+	cancellation->dev = dev;
+	cancellation->inf = inf;
+	cancellation->uapi = uapi;
+	init_completion(&cancellation->done);
+	cancellation->msg.fail = ethosu_cancel_inference_fail;
+
+	ret = ethosu_mailbox_register(mailbox,
+				      &cancellation->msg);
+	if (ret < 0)
+		goto kfree;
+
+	dev_dbg(dev,
+		"Inference cancellation create. cancel=0x%pK, msg.id=%ddev",
+		cancellation, cancellation->msg.id);
+
+	ret = ethosu_cancel_inference_send(cancellation, mailbox);
+	if (0 != ret)
+		goto deregister;
+
+	/* Unlock the mutex before going to block on the condition */
+	device_unlock(dev);
+
+	/* wait for response to arrive back */
+	timeout = wait_for_completion_timeout(&cancellation->done,
+					      msecs_to_jiffies(
+						      CANCEL_INFERENCE_RESP_TIMEOUT_MS));
+	/* take back the mutex before resuming to do anything */
+	ret = device_lock_interruptible(dev);
+	if (0 != ret)
+		goto deregister;
+
+	if (0 == timeout /* timed out*/) {
+		dev_warn(dev,
+			 "Msg: Cancel Inference response lost - timeoutdev");
+		ret = -EIO;
+
+		rproc_report_crash(rproc_get_by_child(dev), RPROC_FATAL_ERROR);
+		goto deregister;
+	}
+
+	if (cancellation->errno) {
+		ret = cancellation->errno;
+		rproc_report_crash(rproc_get_by_child(dev), RPROC_FATAL_ERROR);
+		goto deregister;
+	}
+
+	if (inf->status != ETHOSU_UAPI_STATUS_ABORTED)
+		inf->status = ETHOSU_UAPI_STATUS_ABORTED;
+
+deregister:
+	ethosu_mailbox_deregister(mailbox,
+				  &cancellation->msg);
+
+kfree:
+	dev_dbg(dev,
+		"Cancel inference destroy. cancel=0x%pK", cancellation);
+
+	/* decrease the reference on the inference we are refering to */
+	ethosu_inference_put(cancellation->inf);
+	devm_kfree(dev, cancellation);
+
+	return ret;
+}
+
+void ethosu_cancel_inference_rsp(struct ethosu_mailbox *mailbox,
+				 int msg_id,
+				 struct ethosu_core_msg_cancel_inference_rsp *rsp)
+{
+	struct device *dev = mailbox->dev;
+	struct ethosu_mailbox_msg *msg;
+	struct ethosu_cancel_inference *cancellation;
+
+	msg = ethosu_mailbox_find(mailbox, msg_id,
+				  ETHOSU_CORE_MSG_CANCEL_INFERENCE_REQ);
+	if (IS_ERR(msg)) {
+		dev_warn(dev,
+			 "Id for cancel inference msg not found. Id=0x%x: %ld",
+			 msg_id, PTR_ERR(msg));
+
+		return;
+	}
+
+	cancellation = container_of(msg, typeof(*cancellation), msg);
+
+	if (completion_done(&cancellation->done))
+		return;
+
+	cancellation->errno = 0;
+	switch (rsp->status) {
+	case ETHOSU_CORE_STATUS_OK:
+		cancellation->uapi->status = ETHOSU_UAPI_STATUS_OK;
+		break;
+	case ETHOSU_CORE_STATUS_ERROR:
+		cancellation->uapi->status = ETHOSU_UAPI_STATUS_ERROR;
+		break;
+	}
+
+	complete(&cancellation->done);
+}