LXR linux/drivers/pci/hotplug/s390_pci

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * PCI Hot Plug Controller Driver for System z
   4 *
   5 * Copyright 2012 IBM Corp.
   6 *
   7 * Author(s):
   8 *   Jan Glauber <jang@linux.vnet.ibm.com>
   9 */
  10
  11#define KMSG_COMPONENT "zpci"
  12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14#include <linux/kernel.h>
  15#include <linux/slab.h>
  16#include <linux/pci.h>
  17#include <linux/pci_hotplug.h>
  18#include <asm/pci_debug.h>
  19#include <asm/sclp.h>
  20
  21#define SLOT_NAME_SIZE  10
  22
  23static int enable_slot(struct hotplug_slot *hotplug_slot)
  24{
  25        struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
  26                                             hotplug_slot);
  27        int rc;
  28
  29        if (zdev->state != ZPCI_FN_STATE_STANDBY)
  30                return -EIO;
  31
  32        rc = sclp_pci_configure(zdev->fid);
  33        zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
  34        if (rc)
  35                return rc;
  36        zdev->state = ZPCI_FN_STATE_CONFIGURED;
  37
  38        return zpci_scan_configured_device(zdev, zdev->fh);
  39}
  40
  41static int disable_slot(struct hotplug_slot *hotplug_slot)
  42{
  43        struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
  44                                             hotplug_slot);
  45        struct pci_dev *pdev;
  46
  47        if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
  48                return -EIO;
  49
  50        pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
  51        if (pdev && pci_num_vf(pdev)) {
  52                pci_dev_put(pdev);
  53                return -EBUSY;
  54        }
  55        pci_dev_put(pdev);
  56
  57        return zpci_deconfigure_device(zdev);
  58}
  59
  60static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
  61{
  62        struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
  63                                             hotplug_slot);
  64
  65        switch (zdev->state) {
  66        case ZPCI_FN_STATE_STANDBY:
  67                *value = 0;
  68                break;
  69        default:
  70                *value = 1;
  71                break;
  72        }
  73        return 0;
  74}
  75
  76static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
  77{
  78        /* if the slot exits it always contains a function */
  79        *value = 1;
  80        return 0;
  81}
  82
  83static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
  84        .enable_slot =          enable_slot,
  85        .disable_slot =         disable_slot,
  86        .get_power_status =     get_power_status,
  87        .get_adapter_status =   get_adapter_status,
  88};
  89
  90int zpci_init_slot(struct zpci_dev *zdev)
  91{
  92        char name[SLOT_NAME_SIZE];
  93        struct zpci_bus *zbus = zdev->zbus;
  94
  95        zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
  96
  97        snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
  98        return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
  99                               zdev->devfn, name);
 100}
 101
 102void zpci_exit_slot(struct zpci_dev *zdev)
 103{
 104        pci_hp_deregister(&zdev->hotplug_slot);
 105}
 106