accel/qaic: Increase number of in_reset states

'in_reset' holds the state of the device. As part of bringup, the device
needs to be queried to check if it's in a valid state. Add a new state
that indicates that the device is coming up, but not ready for users
yet. Rename to 'dev_state' to better describe the variable.
Signed-off-by: Carl Vanderlip <quic_carlv@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117174337.20174-2-quic_jhugo@quicinc.com

drivers/accel/qaic/qaic.h

@@ -31,6 +31,15 @@
 #define to_drm(qddev) (&(qddev)->drm)
 #define to_accel_kdev(qddev) (to_drm(qddev)->accel->kdev) /* Return Linux device of accel node */
 
+enum __packed dev_states {
+	/* Device is offline or will be very soon */
+	QAIC_OFFLINE,
+	/* Device is booting, not clear if it's in a usable state */
+	QAIC_BOOT,
+	/* Device is fully operational */
+	QAIC_ONLINE,
+};
+
 extern bool datapath_polling;
 
 struct qaic_user {
@@ -121,8 +130,8 @@ struct qaic_device {
 	struct workqueue_struct	*cntl_wq;
 	/* Synchronizes all the users of device during cleanup */
 	struct srcu_struct	dev_lock;
-	/* true: Device under reset; false: Device not under reset */
-	bool			in_reset;
+	/* Track the state of the device during resets */
+	enum dev_states		dev_state;
 	/* true: single MSI is used to operate device */
 	bool			single_msi;
 	/*

drivers/accel/qaic/qaic_control.c

@@ -1022,7 +1022,8 @@ static void *msg_xfer(struct qaic_device *qdev, struct wrapper_list *wrappers, u
 	int xfer_count = 0;
 	int retry_count;
 
-	if (qdev->in_reset) {
+	/* Allow QAIC_BOOT state since we need to check control protocol version */
+	if (qdev->dev_state == QAIC_OFFLINE) {
 		mutex_unlock(&qdev->cntl_mutex);
 		return ERR_PTR(-ENODEV);
 	}
@@ -1306,7 +1307,7 @@ int qaic_manage_ioctl(struct drm_device *dev, void *data, struct drm_file *file_
 	qdev = usr->qddev->qdev;
 
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
 		srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
 		return -ENODEV;

drivers/accel/qaic/qaic_data.c

@@ -690,7 +690,7 @@ int qaic_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *fi
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -749,7 +749,7 @@ int qaic_mmap_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -970,7 +970,7 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -1341,7 +1341,7 @@ static int __qaic_execute_bo_ioctl(struct drm_device *dev, void *data, struct dr
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -1497,7 +1497,7 @@ void irq_polling_work(struct work_struct *work)
 	rcu_id = srcu_read_lock(&dbc->ch_lock);
 
 	while (1) {
-		if (dbc->qdev->in_reset) {
+		if (dbc->qdev->dev_state != QAIC_ONLINE) {
 			srcu_read_unlock(&dbc->ch_lock, rcu_id);
 			return;
 		}
@@ -1687,7 +1687,7 @@ int qaic_wait_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -1756,7 +1756,7 @@ int qaic_perf_stats_bo_ioctl(struct drm_device *dev, void *data, struct drm_file
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}
@@ -1847,7 +1847,7 @@ int qaic_detach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
 
 	qdev = usr->qddev->qdev;
 	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto unlock_dev_srcu;
 	}

drivers/accel/qaic/qaic_drv.c

@@ -64,7 +64,7 @@ static int qaic_open(struct drm_device *dev, struct drm_file *file)
 	int ret;
 
 	rcu_id = srcu_read_lock(&qdev->dev_lock);
-	if (qdev->in_reset) {
+	if (qdev->dev_state != QAIC_ONLINE) {
 		ret = -ENODEV;
 		goto dev_unlock;
 	}
@@ -121,7 +121,7 @@ static void qaic_postclose(struct drm_device *dev, struct drm_file *file)
 	if (qddev) {
 		qdev = qddev->qdev;
 		qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
-		if (!qdev->in_reset) {
+		if (qdev->dev_state == QAIC_ONLINE) {
 			qaic_release_usr(qdev, usr);
 			for (i = 0; i < qdev->num_dbc; ++i)
 				if (qdev->dbc[i].usr && qdev->dbc[i].usr->handle == usr->handle)
@@ -254,7 +254,7 @@ static int qaic_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id
 
 	qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
 
-	qdev->in_reset = false;
+	qdev->dev_state = QAIC_ONLINE;
 
 	dev_set_drvdata(&mhi_dev->dev, qdev);
 	qdev->cntl_ch = mhi_dev;
@@ -291,7 +291,7 @@ static void qaic_notify_reset(struct qaic_device *qdev)
 {
 	int i;
 
-	qdev->in_reset = true;
+	qdev->dev_state = QAIC_OFFLINE;
 	/* wake up any waiters to avoid waiting for timeouts at sync */
 	wake_all_cntl(qdev);
 	for (i = 0; i < qdev->num_dbc; ++i)
@@ -313,7 +313,7 @@ void qaic_dev_reset_clean_local_state(struct qaic_device *qdev, bool exit_reset)
 		release_dbc(qdev, i);
 
 	if (exit_reset)
-		qdev->in_reset = false;
+		qdev->dev_state = QAIC_ONLINE;
 }
 
 static void cleanup_qdev(struct qaic_device *qdev)
@@ -550,7 +550,7 @@ static void qaic_pci_reset_done(struct pci_dev *pdev)
 {
 	struct qaic_device *qdev = pci_get_drvdata(pdev);
 
-	qdev->in_reset = false;
+	qdev->dev_state = QAIC_ONLINE;
 	qaic_mhi_reset_done(qdev->mhi_cntrl);
 }