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@@ -0,0 +1,252 @@
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+/*
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+ * PCI Hot Plug Controller Driver for System z
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+ *
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+ * Copyright 2012 IBM Corp.
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+ *
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+ * Author(s):
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+ * Jan Glauber <jang@linux.vnet.ibm.com>
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+ */
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+
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+#define COMPONENT "zPCI hpc"
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+#define pr_fmt(fmt) COMPONENT ": " fmt
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+
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/slab.h>
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+#include <linux/pci.h>
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+#include <linux/pci_hotplug.h>
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+#include <linux/init.h>
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+#include <asm/sclp.h>
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+
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+#define SLOT_NAME_SIZE 10
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+static LIST_HEAD(s390_hotplug_slot_list);
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+
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+MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
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+MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
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+MODULE_LICENSE("GPL");
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+
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+static int zpci_fn_configured(enum zpci_state state)
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+{
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+ return state == ZPCI_FN_STATE_CONFIGURED ||
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+ state == ZPCI_FN_STATE_ONLINE;
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+}
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+
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+/*
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+ * struct slot - slot information for each *physical* slot
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+ */
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+struct slot {
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+ struct list_head slot_list;
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+ struct hotplug_slot *hotplug_slot;
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+ struct zpci_dev *zdev;
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+};
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+
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+static int enable_slot(struct hotplug_slot *hotplug_slot)
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+{
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+ struct slot *slot = hotplug_slot->private;
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+ int rc;
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+
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+ if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
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+ return -EIO;
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+
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+ rc = sclp_pci_configure(slot->zdev->fid);
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+ if (!rc) {
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+ slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
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+ /* automatically scan the device after is was configured */
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+ zpci_enable_device(slot->zdev);
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+ zpci_scan_device(slot->zdev);
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+ }
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+ return rc;
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+}
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+
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+static int disable_slot(struct hotplug_slot *hotplug_slot)
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+{
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+ struct slot *slot = hotplug_slot->private;
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+ int rc;
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+
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+ if (!zpci_fn_configured(slot->zdev->state))
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+ return -EIO;
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+
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+ /* TODO: we rely on the user to unbind/remove the device, is that plausible
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+ * or do we need to trigger that here?
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+ */
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+ rc = sclp_pci_deconfigure(slot->zdev->fid);
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+ if (!rc) {
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+ /* Fixme: better call List-PCI to find the disabled FH
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+ for the FID since the FH should be opaque... */
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+ slot->zdev->fh &= 0x7fffffff;
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+ slot->zdev->state = ZPCI_FN_STATE_STANDBY;
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+ }
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+ return rc;
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+}
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+
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+static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
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+{
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+ struct slot *slot = hotplug_slot->private;
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+
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+ switch (slot->zdev->state) {
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+ case ZPCI_FN_STATE_STANDBY:
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+ *value = 0;
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+ break;
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+ default:
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+ *value = 1;
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+ break;
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+ }
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+ return 0;
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+}
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+
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+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
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+{
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+ /* if the slot exits it always contains a function */
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+ *value = 1;
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+ return 0;
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+}
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+
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+static void release_slot(struct hotplug_slot *hotplug_slot)
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+{
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+ struct slot *slot = hotplug_slot->private;
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+
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+ pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
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+ kfree(slot->hotplug_slot->info);
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+ kfree(slot->hotplug_slot);
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+ kfree(slot);
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+}
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+
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+static struct hotplug_slot_ops s390_hotplug_slot_ops = {
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+ .enable_slot = enable_slot,
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+ .disable_slot = disable_slot,
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+ .get_power_status = get_power_status,
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+ .get_adapter_status = get_adapter_status,
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+};
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+
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+static int init_pci_slot(struct zpci_dev *zdev)
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+{
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+ struct hotplug_slot *hotplug_slot;
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+ struct hotplug_slot_info *info;
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+ char name[SLOT_NAME_SIZE];
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+ struct slot *slot;
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+ int rc;
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+
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+ if (!zdev)
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+ return 0;
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+
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+ slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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+ if (!slot)
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+ goto error;
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+
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+ hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
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+ if (!hotplug_slot)
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+ goto error_hp;
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+ hotplug_slot->private = slot;
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+
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+ slot->hotplug_slot = hotplug_slot;
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+ slot->zdev = zdev;
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+
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+ info = kzalloc(sizeof(*info), GFP_KERNEL);
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+ if (!info)
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+ goto error_info;
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+ hotplug_slot->info = info;
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+
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+ hotplug_slot->ops = &s390_hotplug_slot_ops;
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+ hotplug_slot->release = &release_slot;
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+
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+ get_power_status(hotplug_slot, &info->power_status);
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+ get_adapter_status(hotplug_slot, &info->adapter_status);
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+
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+ snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
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+ rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
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+ ZPCI_DEVFN, name);
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+ if (rc) {
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+ pr_err("pci_hp_register failed with error %d\n", rc);
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+ goto error_reg;
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+ }
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+ list_add(&slot->slot_list, &s390_hotplug_slot_list);
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+ return 0;
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+
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+error_reg:
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+ kfree(info);
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+error_info:
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+ kfree(hotplug_slot);
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+error_hp:
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+ kfree(slot);
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+error:
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+ return -ENOMEM;
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+}
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+
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+static int __init init_pci_slots(void)
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+{
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+ struct zpci_dev *zdev;
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+ int device = 0;
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+
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+ /*
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+ * Create a structure for each slot, and register that slot
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+ * with the pci_hotplug subsystem.
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+ */
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+ mutex_lock(&zpci_list_lock);
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+ list_for_each_entry(zdev, &zpci_list, entry) {
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+ init_pci_slot(zdev);
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+ device++;
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+ }
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+
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+ mutex_unlock(&zpci_list_lock);
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+ return (device) ? 0 : -ENODEV;
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+}
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+
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+static void exit_pci_slot(struct zpci_dev *zdev)
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+{
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+ struct list_head *tmp, *n;
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+ struct slot *slot;
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+
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+ list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
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+ slot = list_entry(tmp, struct slot, slot_list);
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+ if (slot->zdev != zdev)
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+ continue;
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+ list_del(&slot->slot_list);
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+ pci_hp_deregister(slot->hotplug_slot);
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+ }
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+}
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+
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+static void __exit exit_pci_slots(void)
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+{
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+ struct list_head *tmp, *n;
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+ struct slot *slot;
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+
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+ /*
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+ * Unregister all of our slots with the pci_hotplug subsystem.
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+ * Memory will be freed in release_slot() callback after slot's
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+ * lifespan is finished.
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+ */
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+ list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
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+ slot = list_entry(tmp, struct slot, slot_list);
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+ list_del(&slot->slot_list);
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+ pci_hp_deregister(slot->hotplug_slot);
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+ }
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+}
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+
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+static int __init pci_hotplug_s390_init(void)
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+{
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+ /*
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+ * Do specific initialization stuff for your driver here
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+ * like initializing your controller hardware (if any) and
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+ * determining the number of slots you have in the system
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+ * right now.
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+ */
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+
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+ if (!pci_probe)
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+ return -EOPNOTSUPP;
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+
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+ /* register callbacks for slot handling from arch code */
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+ mutex_lock(&zpci_list_lock);
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+ hotplug_ops.create_slot = init_pci_slot;
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+ hotplug_ops.remove_slot = exit_pci_slot;
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+ mutex_unlock(&zpci_list_lock);
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+ pr_info("registered hotplug slot callbacks\n");
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+ return init_pci_slots();
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+}
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+
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+static void __exit pci_hotplug_s390_exit(void)
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+{
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+ exit_pci_slots();
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+}
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+
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+module_init(pci_hotplug_s390_init);
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+module_exit(pci_hotplug_s390_exit);
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Jan Glauber