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 * License: GPL 10 */ 11 12 #define KMSG_COMPONENT "zpci" 13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/pci.h> 18 #include <linux/pci_hotplug.h> 19 #include <asm/pci_debug.h> 20 #include <asm/sclp.h> 21 22 #define SLOT_NAME_SIZE 10 23 static LIST_HEAD(s390_hotplug_slot_list); 24 25 static int zpci_fn_configured(enum zpci_state state) 26 { 27 return state == ZPCI_FN_STATE_CONFIGURED || 28 state == ZPCI_FN_STATE_ONLINE; 29 } 30 31 /* 32 * struct slot - slot information for each *physical* slot 33 */ 34 struct slot { 35 struct list_head slot_list; 36 struct hotplug_slot *hotplug_slot; 37 struct zpci_dev *zdev; 38 }; 39 40 static inline int slot_configure(struct slot *slot) 41 { 42 int ret = sclp_pci_configure(slot->zdev->fid); 43 44 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret); 45 if (!ret) 46 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED; 47 48 return ret; 49 } 50 51 static inline int slot_deconfigure(struct slot *slot) 52 { 53 int ret = sclp_pci_deconfigure(slot->zdev->fid); 54 55 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret); 56 if (!ret) 57 slot->zdev->state = ZPCI_FN_STATE_STANDBY; 58 59 return ret; 60 } 61 62 static int enable_slot(struct hotplug_slot *hotplug_slot) 63 { 64 struct slot *slot = hotplug_slot->private; 65 int rc; 66 67 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY) 68 return -EIO; 69 70 rc = slot_configure(slot); 71 if (rc) 72 return rc; 73 74 rc = zpci_enable_device(slot->zdev); 75 if (rc) 76 goto out_deconfigure; 77 78 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN); 79 pci_lock_rescan_remove(); 80 pci_bus_add_devices(slot->zdev->bus); 81 pci_unlock_rescan_remove(); 82 83 return rc; 84 85 out_deconfigure: 86 slot_deconfigure(slot); 87 return rc; 88 } 89 90 static int disable_slot(struct hotplug_slot *hotplug_slot) 91 { 92 struct slot *slot = hotplug_slot->private; 93 struct pci_dev *pdev; 94 int rc; 95 96 if (!zpci_fn_configured(slot->zdev->state)) 97 return -EIO; 98 99 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN); 100 if (pdev) { 101 pci_stop_and_remove_bus_device_locked(pdev); 102 pci_dev_put(pdev); 103 } 104 105 rc = zpci_disable_device(slot->zdev); 106 if (rc) 107 return rc; 108 109 return slot_deconfigure(slot); 110 } 111 112 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 113 { 114 struct slot *slot = hotplug_slot->private; 115 116 switch (slot->zdev->state) { 117 case ZPCI_FN_STATE_STANDBY: 118 *value = 0; 119 break; 120 default: 121 *value = 1; 122 break; 123 } 124 return 0; 125 } 126 127 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 128 { 129 /* if the slot exits it always contains a function */ 130 *value = 1; 131 return 0; 132 } 133 134 static void release_slot(struct hotplug_slot *hotplug_slot) 135 { 136 struct slot *slot = hotplug_slot->private; 137 138 kfree(slot->hotplug_slot->info); 139 kfree(slot->hotplug_slot); 140 kfree(slot); 141 } 142 143 static struct hotplug_slot_ops s390_hotplug_slot_ops = { 144 .enable_slot = enable_slot, 145 .disable_slot = disable_slot, 146 .get_power_status = get_power_status, 147 .get_adapter_status = get_adapter_status, 148 }; 149 150 int zpci_init_slot(struct zpci_dev *zdev) 151 { 152 struct hotplug_slot *hotplug_slot; 153 struct hotplug_slot_info *info; 154 char name[SLOT_NAME_SIZE]; 155 struct slot *slot; 156 int rc; 157 158 if (!zdev) 159 return 0; 160 161 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 162 if (!slot) 163 goto error; 164 165 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 166 if (!hotplug_slot) 167 goto error_hp; 168 hotplug_slot->private = slot; 169 170 slot->hotplug_slot = hotplug_slot; 171 slot->zdev = zdev; 172 173 info = kzalloc(sizeof(*info), GFP_KERNEL); 174 if (!info) 175 goto error_info; 176 hotplug_slot->info = info; 177 178 hotplug_slot->ops = &s390_hotplug_slot_ops; 179 hotplug_slot->release = &release_slot; 180 181 get_power_status(hotplug_slot, &info->power_status); 182 get_adapter_status(hotplug_slot, &info->adapter_status); 183 184 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid); 185 rc = pci_hp_register(slot->hotplug_slot, zdev->bus, 186 ZPCI_DEVFN, name); 187 if (rc) 188 goto error_reg; 189 190 list_add(&slot->slot_list, &s390_hotplug_slot_list); 191 return 0; 192 193 error_reg: 194 kfree(info); 195 error_info: 196 kfree(hotplug_slot); 197 error_hp: 198 kfree(slot); 199 error: 200 return -ENOMEM; 201 } 202 203 void zpci_exit_slot(struct zpci_dev *zdev) 204 { 205 struct slot *slot, *next; 206 207 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list, 208 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