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
50 zpci_err("error CCDF:\n");
51 zpci_err_hex(ccdf, sizeof(*ccdf));
52
53 if (!zdev)
54 return;
55
56 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
57 pci_name(zdev->pdev), ccdf->pec, ccdf->fid);
58 }
59
zpci_event_error(void * data)60 void zpci_event_error(void *data)
61 {
62 if (zpci_is_enabled())
63 __zpci_event_error(data);
64 }
65
__zpci_event_availability(struct zpci_ccdf_avail * ccdf)66 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
67 {
68 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
69 struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
70 int ret;
71
72 pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
73 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
74 zpci_err("avail CCDF:\n");
75 zpci_err_hex(ccdf, sizeof(*ccdf));
76
77 switch (ccdf->pec) {
78 case 0x0301: /* Standby -> Configured */
79 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
80 break;
81 zdev->state = ZPCI_FN_STATE_CONFIGURED;
82 zdev->fh = ccdf->fh;
83 ret = zpci_enable_device(zdev);
84 if (ret)
85 break;
86 pci_rescan_bus(zdev->bus);
87 break;
88 case 0x0302: /* Reserved -> Standby */
89 if (!zdev)
90 clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
91 break;
92 case 0x0303: /* Deconfiguration requested */
93 if (pdev)
94 pci_stop_and_remove_bus_device(pdev);
95
96 ret = zpci_disable_device(zdev);
97 if (ret)
98 break;
99
100 ret = sclp_pci_deconfigure(zdev->fid);
101 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
102 if (!ret)
103 zdev->state = ZPCI_FN_STATE_STANDBY;
104
105 break;
106 case 0x0304: /* Configured -> Standby */
107 if (pdev) {
108 /* Give the driver a hint that the function is
109 * already unusable. */
110 pdev->error_state = pci_channel_io_perm_failure;
111 pci_stop_and_remove_bus_device(pdev);
112 }
113
114 zdev->fh = ccdf->fh;
115 zpci_disable_device(zdev);
116 zdev->state = ZPCI_FN_STATE_STANDBY;
117 break;
118 case 0x0306: /* 0x308 or 0x302 for multiple devices */
119 clp_rescan_pci_devices();
120 break;
121 case 0x0308: /* Standby -> Reserved */
122 if (!zdev)
123 break;
124 pci_stop_root_bus(zdev->bus);
125 pci_remove_root_bus(zdev->bus);
126 break;
127 default:
128 break;
129 }
130 }
131
zpci_event_availability(void * data)132 void zpci_event_availability(void *data)
133 {
134 if (zpci_is_enabled())
135 __zpci_event_availability(data);
136 }
137