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-rw-r--r--drivers/rpmsg/qcom_glink_native.c75
-rw-r--r--drivers/rpmsg/qcom_glink_native.h5
-rw-r--r--drivers/rpmsg/qcom_glink_rpm.c4
-rw-r--r--drivers/rpmsg/qcom_glink_smem.c1
4 files changed, 79 insertions, 6 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 50a800803688..46e2530f61da 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -31,6 +31,7 @@
#include "qcom_glink_native.h"
#define GLINK_NAME_SIZE 32
+#define GLINK_VERSION_1 1
#define RPM_GLINK_CID_MIN 1
#define RPM_GLINK_CID_MAX 65536
@@ -94,6 +95,9 @@ struct qcom_glink {
struct mutex idr_lock;
struct idr lcids;
struct idr rcids;
+ unsigned long features;
+
+ bool intentless;
};
enum {
@@ -256,8 +260,8 @@ static int qcom_glink_send_version(struct qcom_glink *glink)
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
- msg.param1 = cpu_to_le16(1);
- msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS);
+ msg.param1 = cpu_to_le16(GLINK_VERSION_1);
+ msg.param2 = cpu_to_le32(glink->features);
return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
@@ -267,8 +271,8 @@ static void qcom_glink_send_version_ack(struct qcom_glink *glink)
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
- msg.param1 = cpu_to_le16(1);
- msg.param2 = cpu_to_le32(0);
+ msg.param1 = cpu_to_le16(GLINK_VERSION_1);
+ msg.param2 = cpu_to_le32(glink->features);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
@@ -362,6 +366,63 @@ static void qcom_glink_send_close_ack(struct qcom_glink *glink,
qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
}
+/**
+ * qcom_glink_receive_version() - receive version/features from remote system
+ *
+ * @glink: pointer to transport interface
+ * @r_version: remote version
+ * @r_features: remote features
+ *
+ * This function is called in response to a remote-initiated version/feature
+ * negotiation sequence.
+ */
+static void qcom_glink_receive_version(struct qcom_glink *glink,
+ u32 version,
+ u32 features)
+{
+ switch (version) {
+ case 0:
+ break;
+ case GLINK_VERSION_1:
+ glink->features &= features;
+ /* FALLTHROUGH */
+ default:
+ qcom_glink_send_version_ack(glink);
+ break;
+ }
+}
+
+/**
+ * qcom_glink_receive_version_ack() - receive negotiation ack from remote system
+ *
+ * @glink: pointer to transport interface
+ * @r_version: remote version response
+ * @r_features: remote features response
+ *
+ * This function is called in response to a local-initiated version/feature
+ * negotiation sequence and is the counter-offer from the remote side based
+ * upon the initial version and feature set requested.
+ */
+static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
+ u32 version,
+ u32 features)
+{
+ switch (version) {
+ case 0:
+ /* Version negotiation failed */
+ break;
+ case GLINK_VERSION_1:
+ if (features == glink->features)
+ break;
+
+ glink->features &= features;
+ /* FALLTHROUGH */
+ default:
+ qcom_glink_send_version(glink);
+ break;
+ }
+}
+
static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
{
struct glink_defer_cmd *dcmd;
@@ -908,9 +969,10 @@ static void qcom_glink_work(struct work_struct *work)
switch (cmd) {
case RPM_CMD_VERSION:
- qcom_glink_send_version_ack(glink);
+ qcom_glink_receive_version(glink, param1, param2);
break;
case RPM_CMD_VERSION_ACK:
+ qcom_glink_receive_version_ack(glink, param1, param2);
break;
case RPM_CMD_OPEN:
qcom_glink_rx_open(glink, param1, msg->data);
@@ -931,6 +993,7 @@ static void qcom_glink_work(struct work_struct *work)
}
struct qcom_glink *qcom_glink_native_probe(struct device *dev,
+ unsigned long features,
struct qcom_glink_pipe *rx,
struct qcom_glink_pipe *tx)
{
@@ -946,6 +1009,8 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
glink->tx_pipe = tx;
glink->rx_pipe = rx;
+ glink->features = features;
+
mutex_init(&glink->tx_lock);
spin_lock_init(&glink->rx_lock);
INIT_LIST_HEAD(&glink->rx_queue);
diff --git a/drivers/rpmsg/qcom_glink_native.h b/drivers/rpmsg/qcom_glink_native.h
index 197bb9da2c65..456ec79811f7 100644
--- a/drivers/rpmsg/qcom_glink_native.h
+++ b/drivers/rpmsg/qcom_glink_native.h
@@ -14,6 +14,10 @@
#ifndef __QCOM_GLINK_NATIVE_H__
#define __QCOM_GLINK_NATIVE_H__
+#define GLINK_FEATURE_INTENT_REUSE BIT(0)
+#define GLINK_FEATURE_MIGRATION BIT(1)
+#define GLINK_FEATURE_TRACER_PKT BIT(2)
+
struct qcom_glink_pipe {
size_t length;
@@ -31,6 +35,7 @@ struct qcom_glink_pipe {
struct qcom_glink;
struct qcom_glink *qcom_glink_native_probe(struct device *dev,
+ unsigned long features,
struct qcom_glink_pipe *rx,
struct qcom_glink_pipe *tx);
void qcom_glink_native_remove(struct qcom_glink *glink);
diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c
index cc73af0aae8a..7d039cd344cb 100644
--- a/drivers/rpmsg/qcom_glink_rpm.c
+++ b/drivers/rpmsg/qcom_glink_rpm.c
@@ -302,7 +302,9 @@ static int glink_rpm_probe(struct platform_device *pdev)
writel(0, tx_pipe->head);
writel(0, rx_pipe->tail);
- glink = qcom_glink_native_probe(&pdev->dev, &rx_pipe->native,
+ glink = qcom_glink_native_probe(&pdev->dev,
+ 0,
+ &rx_pipe->native,
&tx_pipe->native);
if (IS_ERR(glink))
return PTR_ERR(glink);
diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c
index 19179a15b229..8ad641a08cd8 100644
--- a/drivers/rpmsg/qcom_glink_smem.c
+++ b/drivers/rpmsg/qcom_glink_smem.c
@@ -284,6 +284,7 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent,
*tx_pipe->head = 0;
glink = qcom_glink_native_probe(dev,
+ 0,
&rx_pipe->native, &tx_pipe->native);
if (IS_ERR(glink)) {
ret = PTR_ERR(glink);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.