1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI Hot Plug Controller Driver for System z
5 * Copyright 2012 IBM Corp.
8 * Jan Glauber <jang@linux.vnet.ibm.com>
11 #define KMSG_COMPONENT "zpci"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
21 #define SLOT_NAME_SIZE 10
22 static LIST_HEAD(s390_hotplug_slot_list
);
24 static int zpci_fn_configured(enum zpci_state state
)
26 return state
== ZPCI_FN_STATE_CONFIGURED
||
27 state
== ZPCI_FN_STATE_ONLINE
;
31 * struct slot - slot information for each *physical* slot
34 struct list_head slot_list
;
35 struct hotplug_slot hotplug_slot
;
36 struct zpci_dev
*zdev
;
39 static inline struct slot
*to_slot(struct hotplug_slot
*hotplug_slot
)
41 return container_of(hotplug_slot
, struct slot
, hotplug_slot
);
44 static inline int slot_configure(struct slot
*slot
)
46 int ret
= sclp_pci_configure(slot
->zdev
->fid
);
48 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot
->zdev
->fid
, ret
);
50 slot
->zdev
->state
= ZPCI_FN_STATE_CONFIGURED
;
55 static inline int slot_deconfigure(struct slot
*slot
)
57 int ret
= sclp_pci_deconfigure(slot
->zdev
->fid
);
59 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot
->zdev
->fid
, ret
);
61 slot
->zdev
->state
= ZPCI_FN_STATE_STANDBY
;
66 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
68 struct slot
*slot
= to_slot(hotplug_slot
);
71 if (slot
->zdev
->state
!= ZPCI_FN_STATE_STANDBY
)
74 rc
= slot_configure(slot
);
78 rc
= zpci_enable_device(slot
->zdev
);
82 pci_scan_slot(slot
->zdev
->bus
, ZPCI_DEVFN
);
83 pci_lock_rescan_remove();
84 pci_bus_add_devices(slot
->zdev
->bus
);
85 pci_unlock_rescan_remove();
90 slot_deconfigure(slot
);
94 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
96 struct slot
*slot
= to_slot(hotplug_slot
);
100 if (!zpci_fn_configured(slot
->zdev
->state
))
103 pdev
= pci_get_slot(slot
->zdev
->bus
, ZPCI_DEVFN
);
105 pci_stop_and_remove_bus_device_locked(pdev
);
109 rc
= zpci_disable_device(slot
->zdev
);
113 return slot_deconfigure(slot
);
116 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
118 struct slot
*slot
= to_slot(hotplug_slot
);
120 switch (slot
->zdev
->state
) {
121 case ZPCI_FN_STATE_STANDBY
:
131 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
133 /* if the slot exits it always contains a function */
138 static const struct hotplug_slot_ops s390_hotplug_slot_ops
= {
139 .enable_slot
= enable_slot
,
140 .disable_slot
= disable_slot
,
141 .get_power_status
= get_power_status
,
142 .get_adapter_status
= get_adapter_status
,
145 int zpci_init_slot(struct zpci_dev
*zdev
)
147 char name
[SLOT_NAME_SIZE
];
154 slot
= kzalloc(sizeof(*slot
), GFP_KERNEL
);
159 slot
->hotplug_slot
.ops
= &s390_hotplug_slot_ops
;
161 snprintf(name
, SLOT_NAME_SIZE
, "%08x", zdev
->fid
);
162 rc
= pci_hp_register(&slot
->hotplug_slot
, zdev
->bus
,
167 list_add(&slot
->slot_list
, &s390_hotplug_slot_list
);
176 void zpci_exit_slot(struct zpci_dev
*zdev
)
178 struct slot
*slot
, *next
;
180 list_for_each_entry_safe(slot
, next
, &s390_hotplug_slot_list
,
182 if (slot
->zdev
!= zdev
)
184 list_del(&slot
->slot_list
);
185 pci_hp_deregister(&slot
->hotplug_slot
);