1 // SPDX-License-Identifier: GPL-2.0+
3  * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
15 #include <asm/pci-bridge.h>
23  * RTAS call get-sensor-state(DR_ENTITY_SENSE) return values as per PAPR:
24  * -- generic return codes ---
25  *    -1: Hardware Error
26  *    -2: RTAS_BUSY
27  *    -3: Invalid sensor. RTAS Parameter Error.
28  * -- rtas_get_sensor function specific return codes ---
29  * -9000: Need DR entity to be powered up and unisolated before RTAS call
30  * -9001: Need DR entity to be powered up, but not unisolated, before RTAS call
31  * -9002: DR entity unusable
32  *  990x: Extended delay - where x is a number in the range of 0-5
34 #define RTAS_SLOT_UNISOLATED		-9000
35 #define RTAS_SLOT_NOT_UNISOLATED	-9001
36 #define RTAS_SLOT_NOT_USABLE		-9002
46 		return -EFAULT;  in rtas_get_sensor_errno()
48 		return -ENODEV;  in rtas_get_sensor_errno()
51 		return -EBUSY;  in rtas_get_sensor_errno()
59  * On certain PHB failures, the RTAS call rtas_call(get-sensor-state) returns
61  * interface rtas_get_sensor() loops over the RTAS call on extended delay
63  * (-1). This causes the EEH handler to get stuck for ~6 seconds before it
66  * invoke rtas_call(get-sensor-state) directly if the respective PE is in EEH
67  * recovery state and return -EBUSY error based on RTAS return status. This
75 	int token = rtas_token("get-sensor-state");  in __rpaphp_get_sensor_state()
78 	struct pci_controller *phb = PCI_DN(slot->dn)->phb;  in __rpaphp_get_sensor_state()
81 		return -ENOENT;  in __rpaphp_get_sensor_state()
87 	pdn = list_first_entry_or_null(&PCI_DN(phb->dn)->child_list,  in __rpaphp_get_sensor_state()
92 	pe = eeh_dev_to_pe(pdn->edev);  in __rpaphp_get_sensor_state()
93 	if (pe && (pe->state & EEH_PE_RECOVERING)) {  in __rpaphp_get_sensor_state()
95 			       slot->index);  in __rpaphp_get_sensor_state()
99 	return rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);  in __rpaphp_get_sensor_state()
110 		if (rc == -EFAULT || rc == -EEXIST) {  in rpaphp_get_sensor_state()
111 			dbg("%s: slot must be power up to get sensor-state\n",  in rpaphp_get_sensor_state()
114 			/* some slots have to be powered up  in rpaphp_get_sensor_state()
115 			 * before get-sensor will succeed.  in rpaphp_get_sensor_state()
117 			rc = rtas_set_power_level(slot->power_domain, POWER_ON,  in rpaphp_get_sensor_state()
120 				dbg("%s: power on slot[%s] failed rc=%d.\n",  in rpaphp_get_sensor_state()
121 				    __func__, slot->name, rc);  in rpaphp_get_sensor_state()
125 		} else if (rc == -ENODEV)  in rpaphp_get_sensor_state()
134  * rpaphp_enable_slot - record slot state, config pci device
146 	slot->state = EMPTY;  in rpaphp_enable_slot()
148 	/* Find out if the power is turned on for the slot */  in rpaphp_enable_slot()
149 	rc = rtas_get_power_level(slot->power_domain, &level);  in rpaphp_enable_slot()
158 	bus = pci_find_bus_by_node(slot->dn);  in rpaphp_enable_slot()
160 		err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);  in rpaphp_enable_slot()
161 		return -EINVAL;  in rpaphp_enable_slot()
164 	slot->bus = bus;  in rpaphp_enable_slot()
165 	slot->pci_devs = &bus->devices;  in rpaphp_enable_slot()
169 		slot->state = NOT_CONFIGURED;  in rpaphp_enable_slot()
171 		/* non-empty slot has to have child */  in rpaphp_enable_slot()
172 		if (!slot->dn->child) {  in rpaphp_enable_slot()
174 			    __func__, slot->name);  in rpaphp_enable_slot()
175 			return -EINVAL;  in rpaphp_enable_slot()
178 		if (list_empty(&bus->devices)) {  in rpaphp_enable_slot()
179 			pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));  in rpaphp_enable_slot()
183 		if (!list_empty(&bus->devices)) {  in rpaphp_enable_slot()
184 			slot->state = CONFIGURED;  in rpaphp_enable_slot()
189 			dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);  in rpaphp_enable_slot()
190 			list_for_each_entry(dev, &bus->devices, bus_list)  in rpaphp_enable_slot()