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 enum zpci_state state;
80 struct pci_dev *pdev;
81 int ret;
82
83 zpci_err("avail CCDF:\n");
84 zpci_err_hex(ccdf, sizeof(*ccdf));
85
86 switch (ccdf->pec) {
87 case 0x0301: /* Reserved|Standby -> Configured */
88 if (!zdev) {
89 zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
90 break;
91 }
92 /* the configuration request may be stale */
93 if (zdev->state != ZPCI_FN_STATE_STANDBY)
94 break;
95 zdev->fh = ccdf->fh;
96 zdev->state = ZPCI_FN_STATE_CONFIGURED;
97 ret = zpci_enable_device(zdev);
98 if (ret)
99 break;
100
101 /* the PCI function will be scanned once function 0 appears */
102 if (!zdev->zbus->bus)
103 break;
104
105 pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
106 if (!pdev)
107 break;
108
109 pci_bus_add_device(pdev);
110 pci_lock_rescan_remove();
111 pci_bus_add_devices(zdev->zbus->bus);
112 pci_unlock_rescan_remove();
113 break;
114 case 0x0302: /* Reserved -> Standby */
115 if (!zdev) {
116 zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
117 break;
118 }
119 zdev->fh = ccdf->fh;
120 break;
121 case 0x0303: /* Deconfiguration requested */
122 if (!zdev)
123 break;
124 zpci_remove_device(zdev, false);
125
126 ret = zpci_disable_device(zdev);
127 if (ret)
128 break;
129
130 ret = sclp_pci_deconfigure(zdev->fid);
131 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
132 if (!ret)
133 zdev->state = ZPCI_FN_STATE_STANDBY;
134
135 break;
136 case 0x0304: /* Configured -> Standby|Reserved */
137 if (!zdev)
138 break;
139 /* Give the driver a hint that the function is
140 * already unusable.
141 */
142 zpci_remove_device(zdev, true);
143
144 zdev->fh = ccdf->fh;
145 zpci_disable_device(zdev);
146 zdev->state = ZPCI_FN_STATE_STANDBY;
147 if (!clp_get_state(ccdf->fid, &state) &&
148 state == ZPCI_FN_STATE_RESERVED) {
149 zpci_device_reserved(zdev);
150 }
151 break;
152 case 0x0306: /* 0x308 or 0x302 for multiple devices */
153 zpci_remove_reserved_devices();
154 clp_scan_pci_devices();
155 break;
156 case 0x0308: /* Standby -> Reserved */
157 if (!zdev)
158 break;
159 zpci_device_reserved(zdev);
160 break;
161 default:
162 break;
163 }
164 }
165
zpci_event_availability(void * data)166 void zpci_event_availability(void *data)
167 {
168 if (zpci_is_enabled())
169 __zpci_event_availability(data);
170 }
171