2 files changed, 189 insertions, 0 deletions

diff --git a/drivers/misc/mic/scif/scif_peer_bus.c b/drivers/misc/mic/scif/scif_peer_bus.c
new file mode 100644
index 000000000000..589ae9ad2501
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_peer_bus.c
@@ -0,0 +1,124 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ */
+#include "scif_main.h"
+#include "../bus/scif_bus.h"
+#include "scif_peer_bus.h"
+
+static inline struct scif_peer_dev *
+dev_to_scif_peer(struct device *dev)
+{
+	return container_of(dev, struct scif_peer_dev, dev);
+}
+
+static inline struct scif_peer_driver *
+drv_to_scif_peer(struct device_driver *drv)
+{
+	return container_of(drv, struct scif_peer_driver, driver);
+}
+
+static int scif_peer_dev_match(struct device *dv, struct device_driver *dr)
+{
+	return !strncmp(dev_name(dv), dr->name, 4);
+}
+
+static int scif_peer_dev_probe(struct device *d)
+{
+	struct scif_peer_dev *dev = dev_to_scif_peer(d);
+	struct scif_peer_driver *drv = drv_to_scif_peer(dev->dev.driver);
+
+	return drv->probe(dev);
+}
+
+static int scif_peer_dev_remove(struct device *d)
+{
+	struct scif_peer_dev *dev = dev_to_scif_peer(d);
+	struct scif_peer_driver *drv = drv_to_scif_peer(dev->dev.driver);
+
+	drv->remove(dev);
+	return 0;
+}
+
+static struct bus_type scif_peer_bus = {
+	.name  = "scif_peer_bus",
+	.match = scif_peer_dev_match,
+	.probe = scif_peer_dev_probe,
+	.remove = scif_peer_dev_remove,
+};
+
+int scif_peer_register_driver(struct scif_peer_driver *driver)
+{
+	driver->driver.bus = &scif_peer_bus;
+	return driver_register(&driver->driver);
+}
+
+void scif_peer_unregister_driver(struct scif_peer_driver *driver)
+{
+	driver_unregister(&driver->driver);
+}
+
+static void scif_peer_release_dev(struct device *d)
+{
+	struct scif_peer_dev *sdev = dev_to_scif_peer(d);
+	struct scif_dev *scifdev = &scif_dev[sdev->dnode];
+
+	scif_cleanup_scifdev(scifdev);
+	kfree(sdev);
+}
+
+struct scif_peer_dev *
+scif_peer_register_device(struct scif_dev *scifdev)
+{
+	int ret;
+	struct scif_peer_dev *spdev;
+
+	spdev = kzalloc(sizeof(*spdev), GFP_KERNEL);
+	if (!spdev)
+		return ERR_PTR(-ENOMEM);
+
+	spdev->dev.parent = scifdev->sdev->dev.parent;
+	spdev->dev.release = scif_peer_release_dev;
+	spdev->dnode = scifdev->node;
+	spdev->dev.bus = &scif_peer_bus;
+
+	dev_set_name(&spdev->dev, "scif_peer-dev%u", spdev->dnode);
+	/*
+	 * device_register() causes the bus infrastructure to look for a
+	 * matching driver.
+	 */
+	ret = device_register(&spdev->dev);
+	if (ret)
+		goto free_spdev;
+	return spdev;
+free_spdev:
+	kfree(spdev);
+	return ERR_PTR(ret);
+}
+
+void scif_peer_unregister_device(struct scif_peer_dev *sdev)
+{
+	device_unregister(&sdev->dev);
+}
+
+int scif_peer_bus_init(void)
+{
+	return bus_register(&scif_peer_bus);
+}
+
+void scif_peer_bus_exit(void)
+{
+	bus_unregister(&scif_peer_bus);
+}
diff --git a/drivers/misc/mic/scif/scif_peer_bus.h b/drivers/misc/mic/scif/scif_peer_bus.h
new file mode 100644
index 000000000000..33f0dbb30152
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_peer_bus.h
@@ -0,0 +1,65 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ */
+#ifndef _SCIF_PEER_BUS_H_
+#define _SCIF_PEER_BUS_H_
+
+#include <linux/device.h>
+#include <linux/mic_common.h>
+
+/*
+ * Peer devices show up as PCIe devices for the mgmt node but not the cards.
+ * The mgmt node discovers all the cards on the PCIe bus and informs the other
+ * cards about their peers. Upon notification of a peer a node adds a peer
+ * device to the peer bus to maintain symmetry in the way devices are
+ * discovered across all nodes in the SCIF network.
+ */
+/**
+ * scif_peer_dev - representation of a peer SCIF device
+ * @dev: underlying device
+ * @dnode - The destination node which this device will communicate with.
+ */
+struct scif_peer_dev {
+	struct device dev;
+	u8 dnode;
+};
+
+/**
+ * scif_peer_driver - operations for a scif_peer I/O driver
+ * @driver: underlying device driver (populate name and owner).
+ * @id_table: the ids serviced by this driver.
+ * @probe: the function to call when a device is found.  Returns 0 or -errno.
+ * @remove: the function to call when a device is removed.
+ */
+struct scif_peer_driver {
+	struct device_driver driver;
+	const struct scif_peer_dev_id *id_table;
+
+	int (*probe)(struct scif_peer_dev *dev);
+	void (*remove)(struct scif_peer_dev *dev);
+};
+
+struct scif_dev;
+
+int scif_peer_register_driver(struct scif_peer_driver *driver);
+void scif_peer_unregister_driver(struct scif_peer_driver *driver);
+
+struct scif_peer_dev *scif_peer_register_device(struct scif_dev *sdev);
+void scif_peer_unregister_device(struct scif_peer_dev *sdev);
+
+int scif_peer_bus_init(void);
+void scif_peer_bus_exit(void);
+#endif /* _SCIF_PEER_BUS_H */