1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c
new file mode 100644
index 000000000..93174f503
--- /dev/null
+++ b/drivers/pci/hotplug/s390_pci_hpc.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCI Hot Plug Controller Driver for System z
+ *
+ * Copyright 2012 IBM Corp.
+ *
+ * Author(s):
+ *   Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+
+#define KMSG_COMPONENT "zpci"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <asm/pci_debug.h>
+#include <asm/sclp.h>
+
+#define SLOT_NAME_SIZE	10
+
+static int zpci_fn_configured(enum zpci_state state)
+{
+	return state == ZPCI_FN_STATE_CONFIGURED ||
+	       state == ZPCI_FN_STATE_ONLINE;
+}
+
+static inline int zdev_configure(struct zpci_dev *zdev)
+{
+	int ret = sclp_pci_configure(zdev->fid);
+
+	zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, ret);
+	if (!ret)
+		zdev->state = ZPCI_FN_STATE_CONFIGURED;
+
+	return ret;
+}
+
+static inline int zdev_deconfigure(struct zpci_dev *zdev)
+{
+	int ret = sclp_pci_deconfigure(zdev->fid);
+
+	zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
+	if (!ret)
+		zdev->state = ZPCI_FN_STATE_STANDBY;
+
+	return ret;
+}
+
+static int enable_slot(struct hotplug_slot *hotplug_slot)
+{
+	struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
+					     hotplug_slot);
+	struct zpci_bus *zbus = zdev->zbus;
+	int rc;
+
+	if (zdev->state != ZPCI_FN_STATE_STANDBY)
+		return -EIO;
+
+	rc = zdev_configure(zdev);
+	if (rc)
+		return rc;
+
+	rc = zpci_enable_device(zdev);
+	if (rc)
+		goto out_deconfigure;
+
+	pci_scan_slot(zbus->bus, zdev->devfn);
+	pci_lock_rescan_remove();
+	pci_bus_add_devices(zbus->bus);
+	pci_unlock_rescan_remove();
+
+	return rc;
+
+out_deconfigure:
+	zdev_deconfigure(zdev);
+	return rc;
+}
+
+static int disable_slot(struct hotplug_slot *hotplug_slot)
+{
+	struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
+					     hotplug_slot);
+	struct pci_dev *pdev;
+	int rc;
+
+	if (!zpci_fn_configured(zdev->state))
+		return -EIO;
+
+	pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
+	if (pdev && pci_num_vf(pdev)) {
+		pci_dev_put(pdev);
+		return -EBUSY;
+	}
+	pci_dev_put(pdev);
+
+	zpci_remove_device(zdev, false);
+
+	rc = zpci_disable_device(zdev);
+	if (rc)
+		return rc;
+
+	return zdev_deconfigure(zdev);
+}
+
+static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
+					     hotplug_slot);
+
+	*value = zpci_is_device_configured(zdev) ? 1 : 0;
+	return 0;
+}
+
+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	/* if the slot exits it always contains a function */
+	*value = 1;
+	return 0;
+}
+
+static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
+	.enable_slot =		enable_slot,
+	.disable_slot =		disable_slot,
+	.get_power_status =	get_power_status,
+	.get_adapter_status =	get_adapter_status,
+};
+
+int zpci_init_slot(struct zpci_dev *zdev)
+{
+	char name[SLOT_NAME_SIZE];
+	struct zpci_bus *zbus = zdev->zbus;
+
+	zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
+
+	snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
+	return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
+			       zdev->devfn, name);
+}
+
+void zpci_exit_slot(struct zpci_dev *zdev)
+{
+	pci_hp_deregister(&zdev->hotplug_slot);
+}