// SPDX-License-Identifier: GPL-2.0+ /* * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. * Copyright (C) 2003 Linda Xie * * All rights reserved. * * Send feedback to * */ #include #include #include #include #include #include #include #include #include #include /* for eeh_add_device() */ #include /* rtas_call */ #include /* for pci_controller */ #include "../pci.h" /* for pci_add_new_bus */ /* and pci_do_scan_bus */ #include "rpaphp.h" bool rpaphp_debug; LIST_HEAD(rpaphp_slot_head); EXPORT_SYMBOL_GPL(rpaphp_slot_head); #define DRIVER_VERSION "0.1" #define DRIVER_AUTHOR "Linda Xie " #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" #define MAX_LOC_CODE 128 MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); module_param_named(debug, rpaphp_debug, bool, 0644); /** * set_attention_status - set attention LED * @hotplug_slot: target &hotplug_slot * @value: LED control value * * echo 0 > attention -- set LED OFF * echo 1 > attention -- set LED ON * echo 2 > attention -- set LED ID(identify, light is blinking) */ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) { int rc; struct slot *slot = to_slot(hotplug_slot); switch (value) { case 0: case 1: case 2: break; default: value = 1; break; } rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); if (!rc) slot->attention_status = value; return rc; } /** * get_power_status - get power status of a slot * @hotplug_slot: slot to get status * @value: pointer to store status */ static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) { int retval, level; struct slot *slot = to_slot(hotplug_slot); retval = rtas_get_power_level(slot->power_domain, &level); if (!retval) *value = level; return retval; } /** * get_attention_status - get attention LED status * @hotplug_slot: slot to get status * @value: pointer to store status */ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = to_slot(hotplug_slot); *value = slot->attention_status; return 0; } static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = to_slot(hotplug_slot); int rc, state; rc = rpaphp_get_sensor_state(slot, &state); *value = NOT_VALID; if (rc) return rc; if (state == EMPTY) *value = EMPTY; else if (state == PRESENT) *value = slot->state; return 0; } static enum pci_bus_speed get_max_bus_speed(struct slot *slot) { enum pci_bus_speed speed; switch (slot->type) { case 1: case 2: case 3: case 4: case 5: case 6: speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ break; case 7: case 8: speed = PCI_SPEED_66MHz; break; case 11: case 14: speed = PCI_SPEED_66MHz_PCIX; break; case 12: case 15: speed = PCI_SPEED_100MHz_PCIX; break; case 13: case 16: speed = PCI_SPEED_133MHz_PCIX; break; default: speed = PCI_SPEED_UNKNOWN; break; } return speed; } static int get_children_props(struct device_node *dn, const __be32 **drc_indexes, const __be32 **drc_names, const __be32 **drc_types, const __be32 **drc_power_domains) { const __be32 *indexes, *names, *types, *domains; indexes = of_get_property(dn, "ibm,drc-indexes", NULL); names = of_get_property(dn, "ibm,drc-names", NULL); types = of_get_property(dn, "ibm,drc-types", NULL); domains = of_get_property(dn, "ibm,drc-power-domains", NULL); if (!indexes || !names || !types || !domains) { /* Slot does not have dynamically-removable children */ return -EINVAL; } if (drc_indexes) *drc_indexes = indexes; if (drc_names) /* &drc_names[1] contains NULL terminated slot names */ *drc_names = names; if (drc_types) /* &drc_types[1] contains NULL terminated slot types */ *drc_types = types; if (drc_power_domains) *drc_power_domains = domains; return 0; } /* Verify the existence of 'drc_name' and/or 'drc_type' within the * current node. First obtain its my-drc-index property. Next, * obtain the DRC info from its parent. Use the my-drc-index for * correlation, and obtain/validate the requested properties. */ static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name, char *drc_type, unsigned int my_index) { char *name_tmp, *type_tmp; const __be32 *indexes, *names; const __be32 *types, *domains; int i, rc; rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); if (rc < 0) { return -EINVAL; } name_tmp = (char *) &names[1]; type_tmp = (char *) &types[1]; /* Iterate through parent properties, looking for my-drc-index */ for (i = 0; i < be32_to_cpu(indexes[0]); i++) { if (be32_to_cpu(indexes[i + 1]) == my_index) break; name_tmp += (strlen(name_tmp) + 1); type_tmp += (strlen(type_tmp) + 1); } if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) && ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp)))) return 0; return -EINVAL; } static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name, char *drc_type, unsigned int my_index) { struct property *info; unsigned int entries; struct of_drc_info drc; const __be32 *value; char cell_drc_name[MAX_DRC_NAME_LEN]; int j; info = of_find_property(dn->parent, "ibm,drc-info", NULL); if (info == NULL) return -EINVAL; value = of_prop_next_u32(info, NULL, &entries); if (!value) return -EINVAL; else value++; for (j = 0; j < entries; j++) { of_read_drc_info_cell(&info, &value, &drc); /* Should now know end of current entry */ /* Found it */ if (my_index >= drc.drc_index_start && my_index <= drc.last_drc_index) { int index = my_index - drc.drc_index_start; sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix, drc.drc_name_suffix_start + index); break; } } if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, cell_drc_name))) && ((drc_type == NULL) || (drc_type && !strcmp(drc_type, drc.drc_type)))) return 0; return -EINVAL; } int rpaphp_check_drc_props(struct device_node *dn, char *drc_name, char *drc_type) { const __be32 *my_index; my_index = of_get_property(dn, "ibm,my-drc-index", NULL); if (!my_index) { /* Node isn't DLPAR/hotplug capable */ return -EINVAL; } if (of_find_property(dn->parent, "ibm,drc-info", NULL)) return rpaphp_check_drc_props_v2(dn, drc_name, drc_type, be32_to_cpu(*my_index)); else return rpaphp_check_drc_props_v1(dn, drc_name, drc_type, be32_to_cpu(*my_index)); } EXPORT_SYMBOL_GPL(rpaphp_check_drc_props); static int is_php_type(char *drc_type) { char *endptr; /* PCI Hotplug nodes have an integer for drc_type */ simple_strtoul(drc_type, &endptr, 10); if (endptr == drc_type) return 0; return 1; } /** * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 * @dn: target &device_node * @indexes: passed to get_children_props() * @names: passed to get_children_props() * @types: returned from get_children_props() * @power_domains: * * This routine will return true only if the device node is * a hotpluggable slot. This routine will return false * for built-in pci slots (even when the built-in slots are * dlparable.) */ static int is_php_dn(struct device_node *dn, const __be32 **indexes, const __be32 **names, const __be32 **types, const __be32 **power_domains) { const __be32 *drc_types; int rc; rc = get_children_props(dn, indexes, names, &drc_types, power_domains); if (rc < 0) return 0; if (!is_php_type((char *) &drc_types[1])) return 0; *types = drc_types; return 1; } static int rpaphp_drc_info_add_slot(struct device_node *dn) { struct slot *slot; struct property *info; struct of_drc_info drc; char drc_name[MAX_DRC_NAME_LEN]; const __be32 *cur; u32 count; int retval = 0; info = of_find_property(dn, "ibm,drc-info", NULL); if (!info) return 0; cur = of_prop_next_u32(info, NULL, &count); if (cur) cur++; else return 0; of_read_drc_info_cell(&info, &cur, &drc); if (!is_php_type(drc.drc_type)) return 0; sprintf(drc_name, "%s%d", drc.drc_name_prefix, drc.drc_name_suffix_start); slot = alloc_slot_struct(dn, drc.drc_index_start, drc_name, drc.drc_power_domain); if (!slot) return -ENOMEM; slot->type = simple_strtoul(drc.drc_type, NULL, 10); retval = rpaphp_enable_slot(slot); if (!retval) retval = rpaphp_register_slot(slot); if (retval) dealloc_slot_struct(slot); return retval; } static int rpaphp_drc_add_slot(struct device_node *dn) { struct slot *slot; int retval = 0; int i; const __be32 *indexes, *names, *types, *power_domains; char *name, *type; /* If this is not a hotplug slot, return without doing anything. */ if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) return 0; dbg("Entry %s: dn=%pOF\n", __func__, dn); /* register PCI devices */ name = (char *) &names[1]; type = (char *) &types[1]; for (i = 0; i < be32_to_cpu(indexes[0]); i++) { int index; index = be32_to_cpu(indexes[i + 1]); slot = alloc_slot_struct(dn, index, name, be32_to_cpu(power_domains[i + 1])); if (!slot) return -ENOMEM; slot->type = simple_strtoul(type, NULL, 10); dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", index, name, type); retval = rpaphp_enable_slot(slot); if (!retval) retval = rpaphp_register_slot(slot); if (retval) dealloc_slot_struct(slot); name += strlen(name) + 1; type += strlen(type) + 1; } dbg("%s - Exit: rc[%d]\n", __func__, retval); /* XXX FIXME: reports a failure only if last entry in loop failed */ return retval; } /** * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. * @dn: device node of slot * * This subroutine will register a hotpluggable slot with the * PCI hotplug infrastructure. This routine is typically called * during boot time, if the hotplug slots are present at boot time, * or is called later, by the dlpar add code, if the slot is * being dynamically added during runtime. * * If the device node points at an embedded (built-in) slot, this * routine will just return without doing anything, since embedded * slots cannot be hotplugged. * * To remove a slot, it suffices to call rpaphp_deregister_slot(). */ int rpaphp_add_slot(struct device_node *dn) { if (!dn->name || strcmp(dn->name, "pci")) return 0; if (of_find_property(dn, "ibm,drc-info", NULL)) return rpaphp_drc_info_add_slot(dn); else return rpaphp_drc_add_slot(dn); } EXPORT_SYMBOL_GPL(rpaphp_add_slot); static void __exit cleanup_slots(void) { struct slot *slot, *next; /* * Unregister all of our slots with the pci_hotplug subsystem, * and free up all memory that we had allocated. */ list_for_each_entry_safe(slot, next, &rpaphp_slot_head, rpaphp_slot_list) { list_del(&slot->rpaphp_slot_list); pci_hp_deregister(&slot->hotplug_slot); dealloc_slot_struct(slot); } } static int __init rpaphp_init(void) { struct device_node *dn; info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); for_each_node_by_name(dn, "pci") rpaphp_add_slot(dn); return 0; } static void __exit rpaphp_exit(void) { cleanup_slots(); } static int enable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = to_slot(hotplug_slot); int state; int retval; if (slot->state == CONFIGURED) return 0; retval = rpaphp_get_sensor_state(slot, &state); if (retval) return retval; if (state == PRESENT) { pseries_eeh_init_edev_recursive(PCI_DN(slot->dn)); pci_lock_rescan_remove(); pci_hp_add_devices(slot->bus); pci_unlock_rescan_remove(); slot->state = CONFIGURED; } else if (state == EMPTY) { slot->state = EMPTY; } else { err("%s: slot[%s] is in invalid state\n", __func__, slot->name); slot->state = NOT_VALID; return -EINVAL; } slot->bus->max_bus_speed = get_max_bus_speed(slot); return 0; } static int disable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = to_slot(hotplug_slot); if (slot->state == NOT_CONFIGURED) return -EINVAL; pci_lock_rescan_remove(); pci_hp_remove_devices(slot->bus); pci_unlock_rescan_remove(); vm_unmap_aliases(); slot->state = NOT_CONFIGURED; return 0; } const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { .enable_slot = enable_slot, .disable_slot = disable_slot, .set_attention_status = set_attention_status, .get_power_status = get_power_status, .get_attention_status = get_attention_status, .get_adapter_status = get_adapter_status, }; module_init(rpaphp_init); module_exit(rpaphp_exit);