1 /* 2 * PCI Hot Plug Controller Driver for System z 3 * 4 * Copyright 2012 IBM Corp. 5 * 6 * Author(s): 7 * Jan Glauber <jang@linux.vnet.ibm.com> 8 */ 9 10 #define KMSG_COMPONENT "zpci" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 13 #include <linux/module.h> 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 static LIST_HEAD(s390_hotplug_slot_list); 23 24 MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com"); 25 MODULE_DESCRIPTION("Hot Plug PCI Controller for System z"); 26 MODULE_LICENSE("GPL"); 27 28 static int zpci_fn_configured(enum zpci_state state) 29 { 30 return state == ZPCI_FN_STATE_CONFIGURED || 31 state == ZPCI_FN_STATE_ONLINE; 32 } 33 34 /* 35 * struct slot - slot information for each *physical* slot 36 */ 37 struct slot { 38 struct list_head slot_list; 39 struct hotplug_slot *hotplug_slot; 40 struct zpci_dev *zdev; 41 }; 42 43 static inline int slot_configure(struct slot *slot) 44 { 45 int ret = sclp_pci_configure(slot->zdev->fid); 46 47 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret); 48 if (!ret) 49 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED; 50 51 return ret; 52 } 53 54 static inline int slot_deconfigure(struct slot *slot) 55 { 56 int ret = sclp_pci_deconfigure(slot->zdev->fid); 57 58 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret); 59 if (!ret) 60 slot->zdev->state = ZPCI_FN_STATE_STANDBY; 61 62 return ret; 63 } 64 65 static int enable_slot(struct hotplug_slot *hotplug_slot) 66 { 67 struct slot *slot = hotplug_slot->private; 68 int rc; 69 70 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY) 71 return -EIO; 72 73 rc = slot_configure(slot); 74 if (rc) 75 return rc; 76 77 rc = zpci_enable_device(slot->zdev); 78 if (rc) 79 goto out_deconfigure; 80 81 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN); 82 pci_lock_rescan_remove(); 83 pci_bus_add_devices(slot->zdev->bus); 84 pci_unlock_rescan_remove(); 85 86 return rc; 87 88 out_deconfigure: 89 slot_deconfigure(slot); 90 return rc; 91 } 92 93 static int disable_slot(struct hotplug_slot *hotplug_slot) 94 { 95 struct slot *slot = hotplug_slot->private; 96 int rc; 97 98 if (!zpci_fn_configured(slot->zdev->state)) 99 return -EIO; 100 101 if (slot->zdev->pdev) 102 pci_stop_and_remove_bus_device_locked(slot->zdev->pdev); 103 104 rc = zpci_disable_device(slot->zdev); 105 if (rc) 106 return rc; 107 108 return slot_deconfigure(slot); 109 } 110 111 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 112 { 113 struct slot *slot = hotplug_slot->private; 114 115 switch (slot->zdev->state) { 116 case ZPCI_FN_STATE_STANDBY: 117 *value = 0; 118 break; 119 default: 120 *value = 1; 121 break; 122 } 123 return 0; 124 } 125 126 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 127 { 128 /* if the slot exits it always contains a function */ 129 *value = 1; 130 return 0; 131 } 132 133 static void release_slot(struct hotplug_slot *hotplug_slot) 134 { 135 struct slot *slot = hotplug_slot->private; 136 137 kfree(slot->hotplug_slot->info); 138 kfree(slot->hotplug_slot); 139 kfree(slot); 140 } 141 142 static struct hotplug_slot_ops s390_hotplug_slot_ops = { 143 .enable_slot = enable_slot, 144 .disable_slot = disable_slot, 145 .get_power_status = get_power_status, 146 .get_adapter_status = get_adapter_status, 147 }; 148 149 int zpci_init_slot(struct zpci_dev *zdev) 150 { 151 struct hotplug_slot *hotplug_slot; 152 struct hotplug_slot_info *info; 153 char name[SLOT_NAME_SIZE]; 154 struct slot *slot; 155 int rc; 156 157 if (!zdev) 158 return 0; 159 160 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 161 if (!slot) 162 goto error; 163 164 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 165 if (!hotplug_slot) 166 goto error_hp; 167 hotplug_slot->private = slot; 168 169 slot->hotplug_slot = hotplug_slot; 170 slot->zdev = zdev; 171 172 info = kzalloc(sizeof(*info), GFP_KERNEL); 173 if (!info) 174 goto error_info; 175 hotplug_slot->info = info; 176 177 hotplug_slot->ops = &s390_hotplug_slot_ops; 178 hotplug_slot->release = &release_slot; 179 180 get_power_status(hotplug_slot, &info->power_status); 181 get_adapter_status(hotplug_slot, &info->adapter_status); 182 183 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid); 184 rc = pci_hp_register(slot->hotplug_slot, zdev->bus, 185 ZPCI_DEVFN, name); 186 if (rc) 187 goto error_reg; 188 189 list_add(&slot->slot_list, &s390_hotplug_slot_list); 190 return 0; 191 192 error_reg: 193 kfree(info); 194 error_info: 195 kfree(hotplug_slot); 196 error_hp: 197 kfree(slot); 198 error: 199 return -ENOMEM; 200 } 201 202 void zpci_exit_slot(struct zpci_dev *zdev) 203 { 204 struct list_head *tmp, *n; 205 struct slot *slot; 206 207 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) { 208 slot = list_entry(tmp, struct slot, slot_list); 209 if (slot->zdev != zdev) 210 continue; 211 list_del(&slot->slot_list); 212 pci_hp_deregister(slot->hotplug_slot); 213 } 214 } 215