mirror of https://gitee.com/openkylin/linux.git
154 lines
3.1 KiB
C
154 lines
3.1 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 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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static inline int zdev_configure(struct zpci_dev *zdev)
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{
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int ret = sclp_pci_configure(zdev->fid);
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zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, ret);
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if (!ret)
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zdev->state = ZPCI_FN_STATE_CONFIGURED;
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return ret;
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}
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static inline int zdev_deconfigure(struct zpci_dev *zdev)
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{
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int ret = sclp_pci_deconfigure(zdev->fid);
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zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
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if (!ret)
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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 zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
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hotplug_slot);
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struct zpci_bus *zbus = zdev->zbus;
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int rc;
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if (zdev->state != ZPCI_FN_STATE_STANDBY)
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return -EIO;
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rc = zdev_configure(zdev);
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if (rc)
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return rc;
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rc = zpci_enable_device(zdev);
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if (rc)
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goto out_deconfigure;
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pci_scan_slot(zbus->bus, zdev->devfn);
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pci_lock_rescan_remove();
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pci_bus_add_devices(zbus->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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zdev_deconfigure(zdev);
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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 zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
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hotplug_slot);
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struct pci_dev *pdev;
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struct zpci_bus *zbus = zdev->zbus;
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int rc;
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if (!zpci_fn_configured(zdev->state))
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return -EIO;
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pdev = pci_get_slot(zbus->bus, zdev->devfn);
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if (pdev) {
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if (pci_num_vf(pdev))
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return -EBUSY;
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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(zdev);
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if (rc)
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return rc;
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return zdev_deconfigure(zdev);
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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 zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
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hotplug_slot);
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switch (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 zpci_bus *zbus = zdev->zbus;
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zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
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snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
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return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
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zdev->devfn, name);
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}
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void zpci_exit_slot(struct zpci_dev *zdev)
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{
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pci_hp_deregister(&zdev->hotplug_slot);
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}
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