Merge tag '20210927135559.738-6-srinivas.kandagatla@linaro.org' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into v11_20211026_srinivas_kandagatla_asoc_qcom_add_audioreach_support for audioreach support

v5.15-rc1 + 20210927135559.738-[23456]-srinivas.kandagatla@linaro.org

This immutable branch is based on v5.15-rc1 and contains the following
patches extending the existig APR driver to also implement GPR:
20210927135559.738-2-srinivas.kandagatla@linaro.org
20210927135559.738-3-srinivas.kandagatla@linaro.org
20210927135559.738-4-srinivas.kandagatla@linaro.org
20210927135559.738-5-srinivas.kandagatla@linaro.org
20210927135559.738-6-srinivas.kandagatla@linaro.org

2 files changed, 236 insertions, 53 deletions

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 79b568f82a1c..bfa2ab5772cf 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -199,7 +199,7 @@ config QCOM_WCNSS_CTRL
 	  firmware to a newly booted WCNSS chip.
 
 config QCOM_APR
-	tristate "Qualcomm APR Bus (Asynchronous Packet Router)"
+	tristate "Qualcomm APR/GPR Bus (Asynchronous/Generic Packet Router)"
 	depends on ARCH_QCOM || COMPILE_TEST
 	depends on RPMSG
 	depends on NET
diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index 475a57b435b2..8a9bfbcd4bb9 100644
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -15,13 +15,23 @@
 #include <linux/rpmsg.h>
 #include <linux/of.h>
 
-struct apr {
+enum {
+	PR_TYPE_APR = 0,
+	PR_TYPE_GPR,
+};
+
+/* Some random values tbh which does not collide with static modules */
+#define GPR_DYNAMIC_PORT_START	0x10000000
+#define GPR_DYNAMIC_PORT_END	0x20000000
+
+struct packet_router {
 	struct rpmsg_endpoint *ch;
 	struct device *dev;
 	spinlock_t svcs_lock;
 	spinlock_t rx_lock;
 	struct idr svcs_idr;
 	int dest_domain_id;
+	int type;
 	struct pdr_handle *pdr;
 	struct workqueue_struct *rxwq;
 	struct work_struct rx_work;
@@ -44,26 +54,103 @@ struct apr_rx_buf {
  */
 int apr_send_pkt(struct apr_device *adev, struct apr_pkt *pkt)
 {
-	struct apr *apr = dev_get_drvdata(adev->dev.parent);
+	struct packet_router *apr = dev_get_drvdata(adev->dev.parent);
 	struct apr_hdr *hdr;
 	unsigned long flags;
 	int ret;
 
-	spin_lock_irqsave(&adev->lock, flags);
+	spin_lock_irqsave(&adev->svc.lock, flags);
 
 	hdr = &pkt->hdr;
 	hdr->src_domain = APR_DOMAIN_APPS;
-	hdr->src_svc = adev->svc_id;
+	hdr->src_svc = adev->svc.id;
 	hdr->dest_domain = adev->domain_id;
-	hdr->dest_svc = adev->svc_id;
+	hdr->dest_svc = adev->svc.id;
 
 	ret = rpmsg_trysend(apr->ch, pkt, hdr->pkt_size);
-	spin_unlock_irqrestore(&adev->lock, flags);
+	spin_unlock_irqrestore(&adev->svc.lock, flags);
 
 	return ret ? ret : hdr->pkt_size;
 }
 EXPORT_SYMBOL_GPL(apr_send_pkt);
 
+void gpr_free_port(gpr_port_t *port)
+{
+	struct packet_router *gpr = port->pr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&gpr->svcs_lock, flags);
+	idr_remove(&gpr->svcs_idr, port->id);
+	spin_unlock_irqrestore(&gpr->svcs_lock, flags);
+
+	kfree(port);
+}
+EXPORT_SYMBOL_GPL(gpr_free_port);
+
+gpr_port_t *gpr_alloc_port(struct apr_device *gdev, struct device *dev,
+				gpr_port_cb cb,	void *priv)
+{
+	struct packet_router *pr = dev_get_drvdata(gdev->dev.parent);
+	gpr_port_t *port;
+	struct pkt_router_svc *svc;
+	int id;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return ERR_PTR(-ENOMEM);
+
+	svc = port;
+	svc->callback = cb;
+	svc->pr = pr;
+	svc->priv = priv;
+	svc->dev = dev;
+	spin_lock_init(&svc->lock);
+
+	spin_lock(&pr->svcs_lock);
+	id = idr_alloc_cyclic(&pr->svcs_idr, svc, GPR_DYNAMIC_PORT_START,
+			      GPR_DYNAMIC_PORT_END, GFP_ATOMIC);
+	if (id < 0) {
+		dev_err(dev, "Unable to allocate dynamic GPR src port\n");
+		kfree(port);
+		spin_unlock(&pr->svcs_lock);
+		return ERR_PTR(id);
+	}
+
+	svc->id = id;
+	spin_unlock(&pr->svcs_lock);
+
+	return port;
+}
+EXPORT_SYMBOL_GPL(gpr_alloc_port);
+
+static int pkt_router_send_svc_pkt(struct pkt_router_svc *svc, struct gpr_pkt *pkt)
+{
+	struct packet_router *pr = svc->pr;
+	struct gpr_hdr *hdr;
+	unsigned long flags;
+	int ret;
+
+	hdr = &pkt->hdr;
+
+	spin_lock_irqsave(&svc->lock, flags);
+	ret = rpmsg_trysend(pr->ch, pkt, hdr->pkt_size);
+	spin_unlock_irqrestore(&svc->lock, flags);
+
+	return ret ? ret : hdr->pkt_size;
+}
+
+int gpr_send_pkt(struct apr_device *gdev, struct gpr_pkt *pkt)
+{
+	return pkt_router_send_svc_pkt(&gdev->svc, pkt);
+}
+EXPORT_SYMBOL_GPL(gpr_send_pkt);
+
+int gpr_send_port_pkt(gpr_port_t *port, struct gpr_pkt *pkt)
+{
+	return pkt_router_send_svc_pkt(port, pkt);
+}
+EXPORT_SYMBOL_GPL(gpr_send_port_pkt);
+
 static void apr_dev_release(struct device *dev)
 {
 	struct apr_device *adev = to_apr_device(dev);
@@ -74,7 +161,7 @@ static void apr_dev_release(struct device *dev)
 static int apr_callback(struct rpmsg_device *rpdev, void *buf,
 				  int len, void *priv, u32 addr)
 {
-	struct apr *apr = dev_get_drvdata(&rpdev->dev);
+	struct packet_router *apr = dev_get_drvdata(&rpdev->dev);
 	struct apr_rx_buf *abuf;
 	unsigned long flags;
 
@@ -100,11 +187,11 @@ static int apr_callback(struct rpmsg_device *rpdev, void *buf,
 	return 0;
 }
 
-
-static int apr_do_rx_callback(struct apr *apr, struct apr_rx_buf *abuf)
+static int apr_do_rx_callback(struct packet_router *apr, struct apr_rx_buf *abuf)
 {
 	uint16_t hdr_size, msg_type, ver, svc_id;
-	struct apr_device *svc = NULL;
+	struct pkt_router_svc *svc;
+	struct apr_device *adev;
 	struct apr_driver *adrv = NULL;
 	struct apr_resp_pkt resp;
 	struct apr_hdr *hdr;
@@ -145,12 +232,15 @@ static int apr_do_rx_callback(struct apr *apr, struct apr_rx_buf *abuf)
 	svc_id = hdr->dest_svc;
 	spin_lock_irqsave(&apr->svcs_lock, flags);
 	svc = idr_find(&apr->svcs_idr, svc_id);
-	if (svc && svc->dev.driver)
-		adrv = to_apr_driver(svc->dev.driver);
+	if (svc && svc->dev->driver) {
+		adev = svc_to_apr_device(svc);
+		adrv = to_apr_driver(adev->dev.driver);
+	}
 	spin_unlock_irqrestore(&apr->svcs_lock, flags);
 
-	if (!adrv) {
-		dev_err(apr->dev, "APR: service is not registered\n");
+	if (!adrv || !adev) {
+		dev_err(apr->dev, "APR: service is not registered (%d)\n",
+			svc_id);
 		return -EINVAL;
 	}
 
@@ -164,20 +254,82 @@ static int apr_do_rx_callback(struct apr *apr, struct apr_rx_buf *abuf)
 	if (resp.payload_size > 0)
 		resp.payload = buf + hdr_size;
 
-	adrv->callback(svc, &resp);
+	adrv->callback(adev, &resp);
+
+	return 0;
+}
+
+static int gpr_do_rx_callback(struct packet_router *gpr, struct apr_rx_buf *abuf)
+{
+	uint16_t hdr_size, ver;
+	struct pkt_router_svc *svc = NULL;
+	struct gpr_resp_pkt resp;
+	struct gpr_hdr *hdr;
+	unsigned long flags;
+	void *buf = abuf->buf;
+	int len = abuf->len;
+
+	hdr = buf;
+	ver = hdr->version;
+	if (ver > GPR_PKT_VER + 1)
+		return -EINVAL;
+
+	hdr_size = hdr->hdr_size;
+	if (hdr_size < GPR_PKT_HEADER_WORD_SIZE) {
+		dev_err(gpr->dev, "GPR: Wrong hdr size:%d\n", hdr_size);
+		return -EINVAL;
+	}
+
+	if (hdr->pkt_size < GPR_PKT_HEADER_BYTE_SIZE || hdr->pkt_size != len) {
+		dev_err(gpr->dev, "GPR: Wrong packet size\n");
+		return -EINVAL;
+	}
+
+	resp.hdr = *hdr;
+	resp.payload_size = hdr->pkt_size - (hdr_size * 4);
+
+	/*
+	 * NOTE: hdr_size is not same as GPR_HDR_SIZE as remote can include
+	 * optional headers in to gpr_hdr which should be ignored
+	 */
+	if (resp.payload_size > 0)
+		resp.payload = buf + (hdr_size *  4);
+
+
+	spin_lock_irqsave(&gpr->svcs_lock, flags);
+	svc = idr_find(&gpr->svcs_idr, hdr->dest_port);
+	spin_unlock_irqrestore(&gpr->svcs_lock, flags);
+
+	if (!svc) {
+		dev_err(gpr->dev, "GPR: Port(%x) is not registered\n",
+			hdr->dest_port);
+		return -EINVAL;
+	}
+
+	if (svc->callback)
+		svc->callback(&resp, svc->priv, 0);
 
 	return 0;
 }
 
 static void apr_rxwq(struct work_struct *work)
 {
-	struct apr *apr = container_of(work, struct apr, rx_work);
+	struct packet_router *apr = container_of(work, struct packet_router, rx_work);
 	struct apr_rx_buf *abuf, *b;
 	unsigned long flags;
 
 	if (!list_empty(&apr->rx_list)) {
 		list_for_each_entry_safe(abuf, b, &apr->rx_list, node) {
-			apr_do_rx_callback(apr, abuf);
+			switch (apr->type) {
+			case PR_TYPE_APR:
+				apr_do_rx_callback(apr, abuf);
+				break;
+			case PR_TYPE_GPR:
+				gpr_do_rx_callback(apr, abuf);
+				break;
+			default:
+				break;
+			}
 			spin_lock_irqsave(&apr->rx_lock, flags);
 			list_del(&abuf->node);
 			spin_unlock_irqrestore(&apr->rx_lock, flags);
@@ -201,7 +353,7 @@ static int apr_device_match(struct device *dev, struct device_driver *drv)
 
 	while (id->domain_id != 0 || id->svc_id != 0) {
 		if (id->domain_id == adev->domain_id &&
-		    id->svc_id == adev->svc_id)
+		    id->svc_id == adev->svc.id)
 			return 1;
 		id++;
 	}
@@ -213,22 +365,27 @@ static int apr_device_probe(struct device *dev)
 {
 	struct apr_device *adev = to_apr_device(dev);
 	struct apr_driver *adrv = to_apr_driver(dev->driver);
+	int ret;
 
-	return adrv->probe(adev);
+	ret = adrv->probe(adev);
+	if (!ret)
+		adev->svc.callback = adrv->gpr_callback;
+
+	return ret;
 }
 
 static void apr_device_remove(struct device *dev)
 {
 	struct apr_device *adev = to_apr_device(dev);
 	struct apr_driver *adrv;
-	struct apr *apr = dev_get_drvdata(adev->dev.parent);
+	struct packet_router *apr = dev_get_drvdata(adev->dev.parent);
 
 	if (dev->driver) {
 		adrv = to_apr_driver(dev->driver);
 		if (adrv->remove)
 			adrv->remove(adev);
 		spin_lock(&apr->svcs_lock);
-		idr_remove(&apr->svcs_idr, adev->svc_id);
+		idr_remove(&apr->svcs_idr, adev->svc.id);
 		spin_unlock(&apr->svcs_lock);
 	}
 }
@@ -255,28 +412,43 @@ struct bus_type aprbus = {
 EXPORT_SYMBOL_GPL(aprbus);
 
 static int apr_add_device(struct device *dev, struct device_node *np,
-			  const struct apr_device_id *id)
+			  u32 svc_id, u32 domain_id)
 {
-	struct apr *apr = dev_get_drvdata(dev);
+	struct packet_router *apr = dev_get_drvdata(dev);
 	struct apr_device *adev = NULL;
+	struct pkt_router_svc *svc;
 	int ret;
 
 	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
 	if (!adev)
 		return -ENOMEM;
 
-	spin_lock_init(&adev->lock);
+	adev->svc_id = svc_id;
+	svc = &adev->svc;
+
+	svc->id = svc_id;
+	svc->pr = apr;
+	svc->priv = adev;
+	svc->dev = dev;
+	spin_lock_init(&svc->lock);
+
+	adev->domain_id = domain_id;
 
-	adev->svc_id = id->svc_id;
-	adev->domain_id = id->domain_id;
-	adev->version = id->svc_version;
 	if (np)
 		snprintf(adev->name, APR_NAME_SIZE, "%pOFn", np);
-	else
-		strscpy(adev->name, id->name, APR_NAME_SIZE);
 
-	dev_set_name(&adev->dev, "aprsvc:%s:%x:%x", adev->name,
-		     id->domain_id, id->svc_id);
+	switch (apr->type) {
+	case PR_TYPE_APR:
+		dev_set_name(&adev->dev, "aprsvc:%s:%x:%x", adev->name,
+			     domain_id, svc_id);
+		break;
+	case PR_TYPE_GPR:
+		dev_set_name(&adev->dev, "gprsvc:%s:%x:%x", adev->name,
+			     domain_id, svc_id);
+		break;
+	default:
+		break;
+	}
 
 	adev->dev.bus = &aprbus;
 	adev->dev.parent = dev;
@@ -285,14 +457,13 @@ static int apr_add_device(struct device *dev, struct device_node *np,
 	adev->dev.driver = NULL;
 
 	spin_lock(&apr->svcs_lock);
-	idr_alloc(&apr->svcs_idr, adev, id->svc_id,
-		  id->svc_id + 1, GFP_ATOMIC);
+	idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
 	spin_unlock(&apr->svcs_lock);
 
 	of_property_read_string_index(np, "qcom,protection-domain",
 				      1, &adev->service_path);
 
-	dev_info(dev, "Adding APR dev: %s\n", dev_name(&adev->dev));
+	dev_info(dev, "Adding APR/GPR dev: %s\n", dev_name(&adev->dev));
 
 	ret = device_register(&adev->dev);
 	if (ret) {
@@ -306,7 +477,7 @@ static int apr_add_device(struct device *dev, struct device_node *np,
 static int of_apr_add_pd_lookups(struct device *dev)
 {
 	const char *service_name, *service_path;
-	struct apr *apr = dev_get_drvdata(dev);
+	struct packet_router *apr = dev_get_drvdata(dev);
 	struct device_node *node;
 	struct pdr_service *pds;
 	int ret;
@@ -336,13 +507,14 @@ static int of_apr_add_pd_lookups(struct device *dev)
 
 static void of_register_apr_devices(struct device *dev, const char *svc_path)
 {
-	struct apr *apr = dev_get_drvdata(dev);
+	struct packet_router *apr = dev_get_drvdata(dev);
 	struct device_node *node;
 	const char *service_path;
 	int ret;
 
 	for_each_child_of_node(dev->of_node, node) {
-		struct apr_device_id id = { {0} };
+		u32 svc_id;
+		u32 domain_id;
 
 		/*
 		 * This function is called with svc_path NULL during
@@ -372,13 +544,13 @@ static void of_register_apr_devices(struct device *dev, const char *svc_path)
 				continue;
 		}
 
-		if (of_property_read_u32(node, "reg", &id.svc_id))
+		if (of_property_read_u32(node, "reg", &svc_id))
 			continue;
 
-		id.domain_id = apr->dest_domain_id;
+		domain_id = apr->dest_domain_id;
 
-		if (apr_add_device(dev, node, &id))
-			dev_err(dev, "Failed to add apr %d svc\n", id.svc_id);
+		if (apr_add_device(dev, node, svc_id, domain_id))
+			dev_err(dev, "Failed to add apr %d svc\n", svc_id);
 	}
 }
 
@@ -398,7 +570,7 @@ static int apr_remove_device(struct device *dev, void *svc_path)
 
 static void apr_pd_status(int state, char *svc_path, void *priv)
 {
-	struct apr *apr = (struct apr *)priv;
+	struct packet_router *apr = (struct packet_router *)priv;
 
 	switch (state) {
 	case SERVREG_SERVICE_STATE_UP:
@@ -413,16 +585,26 @@ static void apr_pd_status(int state, char *svc_path, void *priv)
 static int apr_probe(struct rpmsg_device *rpdev)
 {
 	struct device *dev = &rpdev->dev;
-	struct apr *apr;
+	struct packet_router *apr;
 	int ret;
 
 	apr = devm_kzalloc(dev, sizeof(*apr), GFP_KERNEL);
 	if (!apr)
 		return -ENOMEM;
 
-	ret = of_property_read_u32(dev->of_node, "qcom,apr-domain", &apr->dest_domain_id);
+	ret = of_property_read_u32(dev->of_node, "qcom,domain", &apr->dest_domain_id);
+
+	if (of_device_is_compatible(dev->of_node, "qcom,gpr")) {
+		apr->type = PR_TYPE_GPR;
+	} else {
+		if (ret) /* try deprecated apr-domain property */
+			ret = of_property_read_u32(dev->of_node, "qcom,apr-domain",
+						   &apr->dest_domain_id);
+		apr->type = PR_TYPE_APR;
+	}
+
 	if (ret) {
-		dev_err(dev, "APR Domain ID not specified in DT\n");
+		dev_err(dev, "Domain ID not specified in DT\n");
 		return ret;
 	}
 
@@ -465,7 +647,7 @@ destroy_wq:
 
 static void apr_remove(struct rpmsg_device *rpdev)
 {
-	struct apr *apr = dev_get_drvdata(&rpdev->dev);
+	struct packet_router *apr = dev_get_drvdata(&rpdev->dev);
 
 	pdr_handle_release(apr->pdr);
 	device_for_each_child(&rpdev->dev, NULL, apr_remove_device);
@@ -502,20 +684,21 @@ void apr_driver_unregister(struct apr_driver *drv)
 }
 EXPORT_SYMBOL_GPL(apr_driver_unregister);
 
-static const struct of_device_id apr_of_match[] = {
+static const struct of_device_id pkt_router_of_match[] = {
 	{ .compatible = "qcom,apr"},
 	{ .compatible = "qcom,apr-v2"},
+	{ .compatible = "qcom,gpr"},
 	{}
 };
-MODULE_DEVICE_TABLE(of, apr_of_match);
+MODULE_DEVICE_TABLE(of, pkt_router_of_match);
 
-static struct rpmsg_driver apr_driver = {
+static struct rpmsg_driver packet_router_driver = {
 	.probe = apr_probe,
 	.remove = apr_remove,
 	.callback = apr_callback,
 	.drv = {
 		.name = "qcom,apr",
-		.of_match_table = apr_of_match,
+		.of_match_table = pkt_router_of_match,
 	},
 };
 
@@ -525,7 +708,7 @@ static int __init apr_init(void)
 
 	ret = bus_register(&aprbus);
 	if (!ret)
-		ret = register_rpmsg_driver(&apr_driver);
+		ret = register_rpmsg_driver(&packet_router_driver);
 	else
 		bus_unregister(&aprbus);
 
@@ -535,7 +718,7 @@ static int __init apr_init(void)
 static void __exit apr_exit(void)
 {
 	bus_unregister(&aprbus);
-	unregister_rpmsg_driver(&apr_driver);
+	unregister_rpmsg_driver(&packet_router_driver);
 }
 
 subsys_initcall(apr_init);