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https://github.com/edk2-porting/linux-next.git
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253 lines
5.7 KiB
C
253 lines
5.7 KiB
C
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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 COMPONENT "zPCI hpc"
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#define pr_fmt(fmt) COMPONENT ": " fmt
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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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#define SLOT_NAME_SIZE 10
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static LIST_HEAD(s390_hotplug_slot_list);
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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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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 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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if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
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return -EIO;
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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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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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if (!zpci_fn_configured(slot->zdev->state))
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return -EIO;
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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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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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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 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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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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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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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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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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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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slot->hotplug_slot = hotplug_slot;
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slot->zdev = zdev;
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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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hotplug_slot->ops = &s390_hotplug_slot_ops;
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hotplug_slot->release = &release_slot;
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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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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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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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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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* 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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mutex_unlock(&zpci_list_lock);
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return (device) ? 0 : -ENODEV;
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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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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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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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* 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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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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if (!pci_probe)
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return -EOPNOTSUPP;
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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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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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module_init(pci_hotplug_s390_init);
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module_exit(pci_hotplug_s390_exit);
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