Merge tag 'rproc-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

Pull remoteproc updates from Bjorn Andersson:
 "This introduces device managed versions of functions used to register
  remoteproc devices, add support for remoteproc driver specific
  resource control, enables remoteproc drivers to specify ELF class and
  machine for coredumps. It integrates pm_runtime in the core for
  keeping resources active while the remote is booted and holds a wake
  source while recoverying a remote processor after a firmware crash.

  It refactors the remoteproc device's allocation path to simplify the
  logic, fix a few cleanup bugs and to not clone const strings onto the
  heap. Debugfs code is simplifies using the DEFINE_SHOW_ATTRIBUTE and a
  zero-length array is replaced with flexible-array.

  A new remoteproc driver for the JZ47xx VPU is introduced, the Qualcomm
  SM8250 gains support for audio, compute and sensor remoteprocs and the
  Qualcomm SC7180 modem support is cleaned up and improved.

  The Qualcomm glink subsystem-restart driver is merged into the main
  glink driver, the Qualcomm sysmon driver is extended to properly
  notify remote processors about all other remote processors' state
  transitions"

* tag 'rproc-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc: (43 commits)
  remoteproc: Fix an error code in devm_rproc_alloc()
  MAINTAINERS: Add myself as reviewer for Ingenic rproc driver
  remoteproc: ingenic: Added remoteproc driver
  remoteproc: Add support for runtime PM
  dt-bindings: Document JZ47xx VPU auxiliary processor
  remoteproc: wcss: Fix arguments passed to qcom_add_glink_subdev()
  remoteproc: Fix and restore the parenting hierarchy for vdev
  remoteproc: Fall back to using parent memory pool if no dedicated available
  remoteproc: Replace zero-length array with flexible-array
  remoteproc: wcss: add support for rpmsg communication
  remoteproc: core: Prevent system suspend during remoteproc recovery
  remoteproc: qcom_q6v5_mss: Remove unused q6v5_da_to_va function
  remoteproc: qcom_q6v5_mss: map/unmap mpss segments before/after use
  remoteproc: qcom_q6v5_mss: Drop accesses to MPSS PERPH register space
  dt-bindings: remoteproc: qcom: Replace halt-nav with spare-regs
  remoteproc: qcom: pas: Add SM8250 PAS remoteprocs
  dt-bindings: remoteproc: qcom: pas: Add SM8250 remoteprocs
  remoteproc: qcom_q6v5_mss: Extract mba/mpss from memory-region
  dt-bindings: remoteproc: qcom: Use memory-region to reference memory
  remoteproc: qcom: pas: Add SC7180 Modem support
  ...

1 files changed, 166 insertions, 0 deletions

diff --git a/drivers/rpmsg/qcom_glink_ssr.c b/drivers/rpmsg/qcom_glink_ssr.c
new file mode 100644
index 000000000000..dcd1ce616974
--- /dev/null
+++ b/drivers/rpmsg/qcom_glink_ssr.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017, Linaro Ltd.
+ */
+
+#include <linux/completion.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/rpmsg.h>
+#include <linux/remoteproc/qcom_rproc.h>
+
+/**
+ * struct do_cleanup_msg - The data structure for an SSR do_cleanup message
+ * version:     The G-Link SSR protocol version
+ * command:     The G-Link SSR command - do_cleanup
+ * seq_num:     Sequence number
+ * name_len:    Length of the name of the subsystem being restarted
+ * name:        G-Link edge name of the subsystem being restarted
+ */
+struct do_cleanup_msg {
+	__le32 version;
+	__le32 command;
+	__le32 seq_num;
+	__le32 name_len;
+	char name[32];
+};
+
+/**
+ * struct cleanup_done_msg - The data structure for an SSR cleanup_done message
+ * version:     The G-Link SSR protocol version
+ * response:    The G-Link SSR response to a do_cleanup command, cleanup_done
+ * seq_num:     Sequence number
+ */
+struct cleanup_done_msg {
+	__le32 version;
+	__le32 response;
+	__le32 seq_num;
+};
+
+/**
+ * G-Link SSR protocol commands
+ */
+#define GLINK_SSR_DO_CLEANUP	0
+#define GLINK_SSR_CLEANUP_DONE	1
+
+struct glink_ssr {
+	struct device *dev;
+	struct rpmsg_endpoint *ept;
+
+	struct notifier_block nb;
+
+	u32 seq_num;
+	struct completion completion;
+};
+
+/* Notifier list for all registered glink_ssr instances */
+static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
+
+/**
+ * qcom_glink_ssr_notify() - notify GLINK SSR about stopped remoteproc
+ * @ssr_name:	name of the remoteproc that has been stopped
+ */
+void qcom_glink_ssr_notify(const char *ssr_name)
+{
+	blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr_name);
+}
+EXPORT_SYMBOL_GPL(qcom_glink_ssr_notify);
+
+static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev,
+				   void *data, int len, void *priv, u32 addr)
+{
+	struct cleanup_done_msg *msg = data;
+	struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
+
+	if (len < sizeof(*msg)) {
+		dev_err(ssr->dev, "message too short\n");
+		return -EINVAL;
+	}
+
+	if (le32_to_cpu(msg->version) != 0)
+		return -EINVAL;
+
+	if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE)
+		return 0;
+
+	if (le32_to_cpu(msg->seq_num) != ssr->seq_num) {
+		dev_err(ssr->dev, "invalid sequence number of response\n");
+		return -EINVAL;
+	}
+
+	complete(&ssr->completion);
+
+	return 0;
+}
+
+static int qcom_glink_ssr_notifier_call(struct notifier_block *nb,
+					unsigned long event,
+					void *data)
+{
+	struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb);
+	struct do_cleanup_msg msg;
+	char *ssr_name = data;
+	int ret;
+
+	ssr->seq_num++;
+	reinit_completion(&ssr->completion);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP);
+	msg.seq_num = cpu_to_le32(ssr->seq_num);
+	msg.name_len = cpu_to_le32(strlen(ssr_name));
+	strlcpy(msg.name, ssr_name, sizeof(msg.name));
+
+	ret = rpmsg_send(ssr->ept, &msg, sizeof(msg));
+	if (ret < 0)
+		dev_err(ssr->dev, "failed to send cleanup message\n");
+
+	ret = wait_for_completion_timeout(&ssr->completion, HZ);
+	if (!ret)
+		dev_err(ssr->dev, "timeout waiting for cleanup done message\n");
+
+	return NOTIFY_DONE;
+}
+
+static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev)
+{
+	struct glink_ssr *ssr;
+
+	ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL);
+	if (!ssr)
+		return -ENOMEM;
+
+	init_completion(&ssr->completion);
+
+	ssr->dev = &rpdev->dev;
+	ssr->ept = rpdev->ept;
+	ssr->nb.notifier_call = qcom_glink_ssr_notifier_call;
+
+	dev_set_drvdata(&rpdev->dev, ssr);
+
+	return blocking_notifier_chain_register(&ssr_notifiers, &ssr->nb);
+}
+
+static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev)
+{
+	struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
+
+	blocking_notifier_chain_unregister(&ssr_notifiers, &ssr->nb);
+}
+
+static const struct rpmsg_device_id qcom_glink_ssr_match[] = {
+	{ "glink_ssr" },
+	{}
+};
+
+static struct rpmsg_driver qcom_glink_ssr_driver = {
+	.probe = qcom_glink_ssr_probe,
+	.remove = qcom_glink_ssr_remove,
+	.callback = qcom_glink_ssr_callback,
+	.id_table = qcom_glink_ssr_match,
+	.drv = {
+		.name = "qcom_glink_ssr",
+	},
+};
+module_rpmsg_driver(qcom_glink_ssr_driver);