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