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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/pci.h>
12#include <linux/string.h>
13
14#include <asm/pci-bridge.h>
15#include <asm/rtas.h>
16#include <asm/machdep.h>
17
18#include "../pci.h" /* for pci_add_new_bus */
19#include "rpaphp.h"
20
21int rpaphp_get_sensor_state(struct slot *slot, int *state)
22{
23 int rc;
24 int setlevel;
25
26 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
27
28 if (rc < 0) {
29 if (rc == -EFAULT || rc == -EEXIST) {
30 dbg("%s: slot must be power up to get sensor-state\n",
31 __func__);
32
33 /* some slots have to be powered up
34 * before get-sensor will succeed.
35 */
36 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
37 &setlevel);
38 if (rc < 0) {
39 dbg("%s: power on slot[%s] failed rc=%d.\n",
40 __func__, slot->name, rc);
41 } else {
42 rc = rtas_get_sensor(DR_ENTITY_SENSE,
43 slot->index, state);
44 }
45 } else if (rc == -ENODEV)
46 info("%s: slot is unusable\n", __func__);
47 else
48 err("%s failed to get sensor state\n", __func__);
49 }
50 return rc;
51}
52
53/**
54 * rpaphp_enable_slot - record slot state, config pci device
55 * @slot: target &slot
56 *
57 * Initialize values in the slot structure to indicate if there is a pci card
58 * plugged into the slot. If the slot is not empty, run the pcibios routine
59 * to get pcibios stuff correctly set up.
60 */
61int rpaphp_enable_slot(struct slot *slot)
62{
63 int rc, level, state;
64 struct pci_bus *bus;
65
66 slot->state = EMPTY;
67
68 /* Find out if the power is turned on for the slot */
69 rc = rtas_get_power_level(slot->power_domain, &level);
70 if (rc)
71 return rc;
72
73 /* Figure out if there is an adapter in the slot */
74 rc = rpaphp_get_sensor_state(slot, &state);
75 if (rc)
76 return rc;
77
78 bus = pci_find_bus_by_node(slot->dn);
79 if (!bus) {
80 err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
81 return -EINVAL;
82 }
83
84 slot->bus = bus;
85 slot->pci_devs = &bus->devices;
86
87 /* if there's an adapter in the slot, go add the pci devices */
88 if (state == PRESENT) {
89 slot->state = NOT_CONFIGURED;
90
91 /* non-empty slot has to have child */
92 if (!slot->dn->child) {
93 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
94 __func__, slot->name);
95 return -EINVAL;
96 }
97
98 if (list_empty(&bus->devices))
99 pci_hp_add_devices(bus);
100
101 if (!list_empty(&bus->devices)) {
102 slot->state = CONFIGURED;
103 }
104
105 if (rpaphp_debug) {
106 struct pci_dev *dev;
107 dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
108 list_for_each_entry(dev, &bus->devices, bus_list)
109 dbg("\t%s\n", pci_name(dev));
110 }
111 }
112
113 return 0;
114}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/of.h>
12#include <linux/pci.h>
13#include <linux/string.h>
14
15#include <asm/pci-bridge.h>
16#include <asm/rtas.h>
17#include <asm/machdep.h>
18
19#include "../pci.h" /* for pci_add_new_bus */
20#include "rpaphp.h"
21
22/*
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
33 */
34#define RTAS_SLOT_UNISOLATED -9000
35#define RTAS_SLOT_NOT_UNISOLATED -9001
36#define RTAS_SLOT_NOT_USABLE -9002
37
38static int rtas_get_sensor_errno(int rtas_rc)
39{
40 switch (rtas_rc) {
41 case 0:
42 /* Success case */
43 return 0;
44 case RTAS_SLOT_UNISOLATED:
45 case RTAS_SLOT_NOT_UNISOLATED:
46 return -EFAULT;
47 case RTAS_SLOT_NOT_USABLE:
48 return -ENODEV;
49 case RTAS_BUSY:
50 case RTAS_EXTENDED_DELAY_MIN...RTAS_EXTENDED_DELAY_MAX:
51 return -EBUSY;
52 default:
53 return rtas_error_rc(rtas_rc);
54 }
55}
56
57/*
58 * get_adapter_status() can be called by the EEH handler during EEH recovery.
59 * On certain PHB failures, the RTAS call rtas_call(get-sensor-state) returns
60 * extended busy error (9902) until PHB is recovered by pHyp. The RTAS call
61 * interface rtas_get_sensor() loops over the RTAS call on extended delay
62 * return code (9902) until the return value is either success (0) or error
63 * (-1). This causes the EEH handler to get stuck for ~6 seconds before it
64 * could notify that the PCI error has been detected and stop any active
65 * operations. This sometimes causes EEH recovery to fail. To avoid this issue,
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
68 * will help the EEH handler to notify the driver about the PCI error
69 * immediately and successfully proceed with EEH recovery steps.
70 */
71
72static int __rpaphp_get_sensor_state(struct slot *slot, int *state)
73{
74 int rc;
75 int token = rtas_token("get-sensor-state");
76 struct pci_dn *pdn;
77 struct eeh_pe *pe;
78 struct pci_controller *phb = PCI_DN(slot->dn)->phb;
79
80 if (token == RTAS_UNKNOWN_SERVICE)
81 return -ENOENT;
82
83 /*
84 * Fallback to existing method for empty slot or PE isn't in EEH
85 * recovery.
86 */
87 pdn = list_first_entry_or_null(&PCI_DN(phb->dn)->child_list,
88 struct pci_dn, list);
89 if (!pdn)
90 goto fallback;
91
92 pe = eeh_dev_to_pe(pdn->edev);
93 if (pe && (pe->state & EEH_PE_RECOVERING)) {
94 rc = rtas_call(token, 2, 2, state, DR_ENTITY_SENSE,
95 slot->index);
96 return rtas_get_sensor_errno(rc);
97 }
98fallback:
99 return rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
100}
101
102int rpaphp_get_sensor_state(struct slot *slot, int *state)
103{
104 int rc;
105 int setlevel;
106
107 rc = __rpaphp_get_sensor_state(slot, state);
108
109 if (rc < 0) {
110 if (rc == -EFAULT || rc == -EEXIST) {
111 dbg("%s: slot must be power up to get sensor-state\n",
112 __func__);
113
114 /* some slots have to be powered up
115 * before get-sensor will succeed.
116 */
117 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
118 &setlevel);
119 if (rc < 0) {
120 dbg("%s: power on slot[%s] failed rc=%d.\n",
121 __func__, slot->name, rc);
122 } else {
123 rc = __rpaphp_get_sensor_state(slot, state);
124 }
125 } else if (rc == -ENODEV)
126 info("%s: slot is unusable\n", __func__);
127 else
128 err("%s failed to get sensor state\n", __func__);
129 }
130 return rc;
131}
132
133/**
134 * rpaphp_enable_slot - record slot state, config pci device
135 * @slot: target &slot
136 *
137 * Initialize values in the slot structure to indicate if there is a pci card
138 * plugged into the slot. If the slot is not empty, run the pcibios routine
139 * to get pcibios stuff correctly set up.
140 */
141int rpaphp_enable_slot(struct slot *slot)
142{
143 int rc, level, state;
144 struct pci_bus *bus;
145
146 slot->state = EMPTY;
147
148 /* Find out if the power is turned on for the slot */
149 rc = rtas_get_power_level(slot->power_domain, &level);
150 if (rc)
151 return rc;
152
153 /* Figure out if there is an adapter in the slot */
154 rc = rpaphp_get_sensor_state(slot, &state);
155 if (rc)
156 return rc;
157
158 bus = pci_find_bus_by_node(slot->dn);
159 if (!bus) {
160 err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
161 return -EINVAL;
162 }
163
164 slot->bus = bus;
165 slot->pci_devs = &bus->devices;
166
167 /* if there's an adapter in the slot, go add the pci devices */
168 if (state == PRESENT) {
169 slot->state = NOT_CONFIGURED;
170
171 /* non-empty slot has to have child */
172 if (!slot->dn->child) {
173 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
174 __func__, slot->name);
175 return -EINVAL;
176 }
177
178 if (list_empty(&bus->devices)) {
179 pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
180 pci_hp_add_devices(bus);
181 }
182
183 if (!list_empty(&bus->devices)) {
184 slot->state = CONFIGURED;
185 }
186
187 if (rpaphp_debug) {
188 struct pci_dev *dev;
189 dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
190 list_for_each_entry(dev, &bus->devices, bus_list)
191 dbg("\t%s\n", pci_name(dev));
192 }
193 }
194
195 return 0;
196}