1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2012
4 *
5 * Author(s):
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 */
8
9 #define KMSG_COMPONENT "zpci"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
14 #include <asm/pci_debug.h>
15 #include <asm/sclp.h>
16
17 #include "pci_bus.h"
18
19 /* Content Code Description for PCI Function Error */
20 struct zpci_ccdf_err {
21 u32 reserved1;
22 u32 fh; /* function handle */
23 u32 fid; /* function id */
24 u32 ett : 4; /* expected table type */
25 u32 mvn : 12; /* MSI vector number */
26 u32 dmaas : 8; /* DMA address space */
27 u32 : 6;
28 u32 q : 1; /* event qualifier */
29 u32 rw : 1; /* read/write */
30 u64 faddr; /* failing address */
31 u32 reserved3;
32 u16 reserved4;
33 u16 pec; /* PCI event code */
34 } __packed;
35
36 /* Content Code Description for PCI Function Availability */
37 struct zpci_ccdf_avail {
38 u32 reserved1;
39 u32 fh; /* function handle */
40 u32 fid; /* function id */
41 u32 reserved2;
42 u32 reserved3;
43 u32 reserved4;
44 u32 reserved5;
45 u16 reserved6;
46 u16 pec; /* PCI event code */
47 } __packed;
48
__zpci_event_error(struct zpci_ccdf_err * ccdf)49 static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
50 {
51 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
52 struct pci_dev *pdev = NULL;
53
54 zpci_err("error CCDF:\n");
55 zpci_err_hex(ccdf, sizeof(*ccdf));
56
57 if (zdev)
58 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
59
60 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
61 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
62
63 if (!pdev)
64 return;
65
66 pdev->error_state = pci_channel_io_perm_failure;
67 pci_dev_put(pdev);
68 }
69
zpci_event_error(void * data)70 void zpci_event_error(void *data)
71 {
72 if (zpci_is_enabled())
73 __zpci_event_error(data);
74 }
75
__zpci_event_availability(struct zpci_ccdf_avail * ccdf)76 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
77 {
78 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
79 struct pci_dev *pdev = NULL;
80 enum zpci_state state;
81 int ret;
82
83 if (zdev && zdev->zbus && zdev->zbus->bus)
84 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
85
86 zpci_err("avail CCDF:\n");
87 zpci_err_hex(ccdf, sizeof(*ccdf));
88
89 switch (ccdf->pec) {
90 case 0x0301: /* Reserved|Standby -> Configured */
91 if (!zdev) {
92 ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 1);
93 break;
94 }
95 /* the configuration request may be stale */
96 if (zdev->state != ZPCI_FN_STATE_STANDBY)
97 break;
98 zdev->fh = ccdf->fh;
99 zdev->state = ZPCI_FN_STATE_CONFIGURED;
100 ret = zpci_enable_device(zdev);
101 if (ret)
102 break;
103
104 /* the PCI function will be scanned once function 0 appears */
105 if (!zdev->zbus->bus)
106 break;
107
108 pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
109 if (!pdev)
110 break;
111
112 pci_bus_add_device(pdev);
113 pci_lock_rescan_remove();
114 pci_bus_add_devices(zdev->zbus->bus);
115 pci_unlock_rescan_remove();
116 break;
117 case 0x0302: /* Reserved -> Standby */
118 if (!zdev) {
119 clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
120 break;
121 }
122 zdev->fh = ccdf->fh;
123 break;
124 case 0x0303: /* Deconfiguration requested */
125 if (!zdev)
126 break;
127 if (pdev)
128 zpci_remove_device(zdev);
129
130 ret = zpci_disable_device(zdev);
131 if (ret)
132 break;
133
134 ret = sclp_pci_deconfigure(zdev->fid);
135 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
136 if (!ret)
137 zdev->state = ZPCI_FN_STATE_STANDBY;
138
139 break;
140 case 0x0304: /* Configured -> Standby|Reserved */
141 if (!zdev)
142 break;
143 if (pdev) {
144 /* Give the driver a hint that the function is
145 * already unusable. */
146 pdev->error_state = pci_channel_io_perm_failure;
147 zpci_remove_device(zdev);
148 }
149
150 zdev->fh = ccdf->fh;
151 zpci_disable_device(zdev);
152 zdev->state = ZPCI_FN_STATE_STANDBY;
153 if (!clp_get_state(ccdf->fid, &state) &&
154 state == ZPCI_FN_STATE_RESERVED) {
155 zpci_zdev_put(zdev);
156 }
157 break;
158 case 0x0306: /* 0x308 or 0x302 for multiple devices */
159 zpci_remove_reserved_devices();
160 clp_scan_pci_devices();
161 break;
162 case 0x0308: /* Standby -> Reserved */
163 if (!zdev)
164 break;
165 zpci_zdev_put(zdev);
166 break;
167 default:
168 break;
169 }
170 }
171
zpci_event_availability(void * data)172 void zpci_event_availability(void *data)
173 {
174 if (zpci_is_enabled())
175 __zpci_event_availability(data);
176 }
177
