dmaengine: idxd: move probe() bits for idxd 'struct device' to device.c

Move the code related to a ->probe() function for the idxd
'struct device' to device.c to prep for the idxd device
sub-driver in device.c.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637464189.744545.17423830646786162194.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idxd/device.c

@@ -1290,3 +1290,40 @@ void drv_disable_wq(struct idxd_wq *wq)
 	__drv_disable_wq(wq);
 	mutex_unlock(&wq->wq_lock);
 }
+
+int idxd_device_drv_probe(struct idxd_dev *idxd_dev)
+{
+	struct idxd_device *idxd = idxd_dev_to_idxd(idxd_dev);
+	unsigned long flags;
+	int rc = 0;
+
+	/*
+	 * Device should be in disabled state for the idxd_drv to load. If it's in
+	 * enabled state, then the device was altered outside of driver's control.
+	 * If the state is in halted state, then we don't want to proceed.
+	 */
+	if (idxd->state != IDXD_DEV_DISABLED)
+		return -ENXIO;
+
+	/* Device configuration */
+	spin_lock_irqsave(&idxd->dev_lock, flags);
+	if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
+		rc = idxd_device_config(idxd);
+	spin_unlock_irqrestore(&idxd->dev_lock, flags);
+	if (rc < 0)
+		return -ENXIO;
+
+	/* Start device */
+	rc = idxd_device_enable(idxd);
+	if (rc < 0)
+		return rc;
+
+	/* Setup DMA device without channels */
+	rc = idxd_register_dma_device(idxd);
+	if (rc < 0) {
+		idxd_device_disable(idxd);
+		return rc;
+	}
+
+	return 0;
+}

drivers/dma/idxd/idxd.h

@@ -498,6 +498,7 @@ void idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id);
 void idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id);
 
 /* device control */
+int idxd_device_drv_probe(struct idxd_dev *idxd_dev);
 int drv_enable_wq(struct idxd_wq *wq);
 void drv_disable_wq(struct idxd_wq *wq);
 int idxd_device_init_reset(struct idxd_device *idxd);

drivers/dma/idxd/sysfs.c

@@ -52,44 +52,8 @@ struct bus_type dsa_bus_type = {
 
 static int idxd_dsa_drv_probe(struct idxd_dev *idxd_dev)
 {
-	struct device *dev = &idxd_dev->conf_dev;
-	unsigned long flags;
-	int rc;
-
-	if (is_idxd_dev(idxd_dev)) {
-		struct idxd_device *idxd = idxd_dev_to_idxd(idxd_dev);
-
-		if (idxd->state != IDXD_DEV_DISABLED)
-			return -ENXIO;
-
-		/* Device configuration */
-		spin_lock_irqsave(&idxd->dev_lock, flags);
-		if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
-			rc = idxd_device_config(idxd);
-		spin_unlock_irqrestore(&idxd->dev_lock, flags);
-		if (rc < 0) {
-			dev_dbg(dev, "Device config failed: %d\n", rc);
-			return rc;
-		}
-
-		/* Start device */
-		rc = idxd_device_enable(idxd);
-		if (rc < 0) {
-			dev_warn(dev, "Device enable failed: %d\n", rc);
-			return rc;
-		}
-
-		/* Setup DMA device without channels */
-		rc = idxd_register_dma_device(idxd);
-		if (rc < 0) {
-			dev_dbg(dev, "Failed to register dmaengine device\n");
-			idxd_device_disable(idxd);
-			return rc;
-		}
-
-		dev_info(dev, "Device %s enabled\n", dev_name(dev));
-		return 0;
-	}
+	if (is_idxd_dev(idxd_dev))
+		return idxd_device_drv_probe(idxd_dev);
 
 	if (is_idxd_wq_dev(idxd_dev)) {
 		struct idxd_wq *wq = idxd_dev_to_wq(idxd_dev);