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152 lines
3.1 KiB
152 lines
3.1 KiB
// 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 <[email protected]> |
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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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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(zdev->zbus->bus, zdev->devfn); |
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if (pdev && pci_num_vf(pdev)) { |
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pci_dev_put(pdev); |
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return -EBUSY; |
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} |
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pci_dev_put(pdev); |
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zpci_remove_device(zdev, false); |
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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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