@@ -220,7 +220,7 @@ of the defined channels, and their uses.
+----------------+---------+----------+----------------------------------------+
| QAIC_DEBUG | 18 & 19 | AMSS | Not used. |
+----------------+---------+----------+----------------------------------------+
-| QAIC_TIMESYNC | 20 & 21 | SBL/AMSS | Used to synchronize timestamps in the |
+| QAIC_TIMESYNC | 20 & 21 | SBL | Used to synchronize timestamps in the |
| | | | device side logs with the host time |
| | | | source. |
+----------------+---------+----------+----------------------------------------+
@@ -348,7 +348,7 @@ static struct mhi_channel_config aic100_channels[] = {
.local_elements = 0,
.event_ring = 0,
.dir = DMA_TO_DEVICE,
- .ee_mask = MHI_CH_EE_SBL | MHI_CH_EE_AMSS,
+ .ee_mask = MHI_CH_EE_SBL,
.pollcfg = 0,
.doorbell = MHI_DB_BRST_DISABLE,
.lpm_notify = false,
@@ -364,7 +364,7 @@ static struct mhi_channel_config aic100_channels[] = {
.local_elements = 0,
.event_ring = 0,
.dir = DMA_FROM_DEVICE,
- .ee_mask = MHI_CH_EE_SBL | MHI_CH_EE_AMSS,
+ .ee_mask = MHI_CH_EE_SBL,
.pollcfg = 0,
.doorbell = MHI_DB_BRST_DISABLE,
.lpm_notify = false,
@@ -137,6 +137,10 @@ struct qaic_device {
u32 (*gen_crc)(void *msg);
/* Validate the CRC of a control message */
bool (*valid_crc)(void *msg);
+ /* MHI "QAIC_TIMESYNC" channel device */
+ struct mhi_device *qts_ch;
+ /* Work queue for tasks related to MHI "QAIC_TIMESYNC" channel */
+ struct workqueue_struct *qts_wq;
};
struct qaic_drm_device {
@@ -325,6 +325,7 @@ static void cleanup_qdev(struct qaic_device *qdev)
cleanup_srcu_struct(&qdev->dev_lock);
pci_set_drvdata(qdev->pdev, NULL);
destroy_workqueue(qdev->cntl_wq);
+ destroy_workqueue(qdev->qts_wq);
}
static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct pci_device_id *id)
@@ -348,6 +349,12 @@ static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct pci_de
if (!qdev->cntl_wq)
return NULL;
+ qdev->qts_wq = alloc_workqueue("qaic_ts", WQ_UNBOUND, 0);
+ if (!qdev->qts_wq) {
+ destroy_workqueue(qdev->cntl_wq);
+ return NULL;
+ }
+
pci_set_drvdata(pdev, qdev);
qdev->pdev = pdev;
@@ -22,7 +22,8 @@ module_param(timesync_delay_ms, uint, 0600);
MODULE_PARM_DESC(timesync_delay_ms, "Delay in ms between two consecutive timesync operations");
enum qts_msg_type {
- QAIC_TS_SYNC_REQ = 1,
+ QAIC_TS_CMD_TO_HOST,
+ QAIC_TS_SYNC_REQ,
QAIC_TS_ACK_TO_HOST,
QAIC_TS_MSG_TYPE_MAX
};
@@ -83,6 +84,16 @@ struct mqts_dev {
struct qts_host_time_sync_msg_data *sync_msg;
};
+struct qts_resp_msg {
+ struct qts_hdr hdr;
+} __packed;
+
+struct qts_resp {
+ struct qts_resp_msg data;
+ struct work_struct work;
+ struct qaic_device *qdev;
+};
+
static void qaic_timesync_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
{
struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
@@ -218,12 +229,151 @@ static struct mhi_driver qaic_timesync_driver = {
},
};
+static void qaic_boot_timesync_worker(struct work_struct *work)
+{
+ struct qts_resp *resp = container_of(work, struct qts_resp, work);
+ struct qts_host_time_sync_msg_data *req;
+ struct qts_resp_msg data = resp->data;
+ struct qaic_device *qdev = resp->qdev;
+ struct mhi_device *mhi_dev;
+ struct timespec64 ts;
+ int ret;
+
+ mhi_dev = qdev->qts_ch;
+ /* Queue the response message beforehand to avoid race conditions */
+ ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, &resp->data, sizeof(resp->data), MHI_EOT);
+ if (ret) {
+ kfree(resp);
+ dev_warn(&mhi_dev->dev, "Failed to re-queue response buffer %d\n", ret);
+ return;
+ }
+
+ switch (data.hdr.msg_type) {
+ case QAIC_TS_CMD_TO_HOST:
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ break;
+
+ req->header = data.hdr;
+ req->header.msg_type = QAIC_TS_SYNC_REQ;
+ ktime_get_real_ts64(&ts);
+ req->data.tv_sec = cpu_to_le64(ts.tv_sec);
+ req->data.tv_usec = cpu_to_le64(div_u64(ts.tv_nsec, NSEC_PER_USEC));
+
+ ret = mhi_queue_buf(mhi_dev, DMA_TO_DEVICE, req, sizeof(*req), MHI_EOT);
+ if (ret) {
+ kfree(req);
+ dev_dbg(&mhi_dev->dev, "Failed to send request message. Error %d\n", ret);
+ }
+ break;
+ case QAIC_TS_ACK_TO_HOST:
+ dev_dbg(&mhi_dev->dev, "ACK received from device\n");
+ break;
+ default:
+ dev_err(&mhi_dev->dev, "Invalid message type %u.\n", data.hdr.msg_type);
+ }
+}
+
+static int qaic_boot_timesync_queue_resp(struct mhi_device *mhi_dev, struct qaic_device *qdev)
+{
+ struct qts_resp *resp;
+ int ret;
+
+ resp = kzalloc(sizeof(*resp), GFP_KERNEL);
+ if (!resp)
+ return -ENOMEM;
+
+ resp->qdev = qdev;
+ INIT_WORK(&resp->work, qaic_boot_timesync_worker);
+
+ ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, &resp->data, sizeof(resp->data), MHI_EOT);
+ if (ret) {
+ kfree(resp);
+ dev_warn(&mhi_dev->dev, "Failed to queue response buffer %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void qaic_boot_timesync_remove(struct mhi_device *mhi_dev)
+{
+ struct qaic_device *qdev;
+
+ qdev = dev_get_drvdata(&mhi_dev->dev);
+ mhi_unprepare_from_transfer(qdev->qts_ch);
+ qdev->qts_ch = NULL;
+}
+
+static int qaic_boot_timesync_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+ struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+ int ret;
+
+ ret = mhi_prepare_for_transfer(mhi_dev);
+ if (ret)
+ return ret;
+
+ qdev->qts_ch = mhi_dev;
+ dev_set_drvdata(&mhi_dev->dev, qdev);
+
+ ret = qaic_boot_timesync_queue_resp(mhi_dev, qdev);
+ if (ret) {
+ dev_set_drvdata(&mhi_dev->dev, NULL);
+ qdev->qts_ch = NULL;
+ mhi_unprepare_from_transfer(mhi_dev);
+ }
+
+ return ret;
+}
+
+static void qaic_boot_timesync_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+ kfree(mhi_result->buf_addr);
+}
+
+static void qaic_boot_timesync_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+ struct qts_resp *resp = container_of(mhi_result->buf_addr, struct qts_resp, data);
+
+ if (mhi_result->transaction_status || mhi_result->bytes_xferd != sizeof(resp->data)) {
+ kfree(resp);
+ return;
+ }
+
+ queue_work(resp->qdev->qts_wq, &resp->work);
+}
+
+static const struct mhi_device_id qaic_boot_timesync_match_table[] = {
+ { .chan = "QAIC_TIMESYNC"},
+ {},
+};
+
+static struct mhi_driver qaic_boot_timesync_driver = {
+ .id_table = qaic_boot_timesync_match_table,
+ .remove = qaic_boot_timesync_remove,
+ .probe = qaic_boot_timesync_probe,
+ .ul_xfer_cb = qaic_boot_timesync_ul_xfer_cb,
+ .dl_xfer_cb = qaic_boot_timesync_dl_xfer_cb,
+ .driver = {
+ .name = "qaic_timesync",
+ },
+};
+
int qaic_timesync_init(void)
{
- return mhi_driver_register(&qaic_timesync_driver);
+ int ret;
+
+ ret = mhi_driver_register(&qaic_timesync_driver);
+ if (ret)
+ return ret;
+ ret = mhi_driver_register(&qaic_boot_timesync_driver);
+
+ return ret;
}
void qaic_timesync_deinit(void)
{
+ mhi_driver_unregister(&qaic_boot_timesync_driver);
mhi_driver_unregister(&qaic_timesync_driver);
}