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