189 lines
3.7 KiB
C
189 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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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 <asm/pci_debug.h>
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#include <asm/sclp.h>
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#define SLOT_NAME_SIZE 10
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static LIST_HEAD(s390_hotplug_slot_list);
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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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* 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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static inline struct slot *to_slot(struct hotplug_slot *hotplug_slot)
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{
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return container_of(hotplug_slot, struct slot, hotplug_slot);
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}
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static inline int slot_configure(struct slot *slot)
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{
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int ret = sclp_pci_configure(slot->zdev->fid);
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zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
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if (!ret)
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slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
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return ret;
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}
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static inline int slot_deconfigure(struct slot *slot)
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{
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int ret = sclp_pci_deconfigure(slot->zdev->fid);
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zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
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if (!ret)
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slot->zdev->state = ZPCI_FN_STATE_STANDBY;
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return ret;
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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 = to_slot(hotplug_slot);
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int rc;
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if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
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return -EIO;
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rc = slot_configure(slot);
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if (rc)
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return rc;
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rc = zpci_enable_device(slot->zdev);
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if (rc)
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goto out_deconfigure;
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pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
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pci_lock_rescan_remove();
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pci_bus_add_devices(slot->zdev->bus);
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pci_unlock_rescan_remove();
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return rc;
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out_deconfigure:
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slot_deconfigure(slot);
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return rc;
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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 = to_slot(hotplug_slot);
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struct pci_dev *pdev;
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int rc;
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if (!zpci_fn_configured(slot->zdev->state))
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return -EIO;
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pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
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if (pdev) {
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pci_stop_and_remove_bus_device_locked(pdev);
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pci_dev_put(pdev);
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}
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rc = zpci_disable_device(slot->zdev);
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if (rc)
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return rc;
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return slot_deconfigure(slot);
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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 = to_slot(hotplug_slot);
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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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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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static const 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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int zpci_init_slot(struct zpci_dev *zdev)
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{
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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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if (!zdev)
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return 0;
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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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slot->zdev = zdev;
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slot->hotplug_slot.ops = &s390_hotplug_slot_ops;
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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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goto error_reg;
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list_add(&slot->slot_list, &s390_hotplug_slot_list);
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return 0;
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error_reg:
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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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void zpci_exit_slot(struct zpci_dev *zdev)
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{
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struct slot *slot, *next;
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list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
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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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kfree(slot);
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}
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}
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