Merge remote-tracking branches 'regulator/topic/discharge', 'regulator/topic/fan53555...
[sfrench/cifs-2.6.git] / arch / s390 / pci / pci_event.c
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
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         if (!pdev)
58                 return;
59
60         pdev->error_state = pci_channel_io_perm_failure;
61 }
62
63 void zpci_event_error(void *data)
64 {
65         if (zpci_is_enabled())
66                 __zpci_event_error(data);
67 }
68
69 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
70 {
71         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
72         struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
73         int ret;
74
75         pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
76                 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
77         zpci_err("avail CCDF:\n");
78         zpci_err_hex(ccdf, sizeof(*ccdf));
79
80         switch (ccdf->pec) {
81         case 0x0301: /* Reserved|Standby -> Configured */
82                 if (!zdev) {
83                         ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
84                         if (ret)
85                                 break;
86                         zdev = get_zdev_by_fid(ccdf->fid);
87                 }
88                 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
89                         break;
90                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
91                 zdev->fh = ccdf->fh;
92                 ret = zpci_enable_device(zdev);
93                 if (ret)
94                         break;
95                 pci_lock_rescan_remove();
96                 pci_rescan_bus(zdev->bus);
97                 pci_unlock_rescan_remove();
98                 break;
99         case 0x0302: /* Reserved -> Standby */
100                 if (!zdev)
101                         clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
102                 break;
103         case 0x0303: /* Deconfiguration requested */
104                 if (pdev)
105                         pci_stop_and_remove_bus_device_locked(pdev);
106
107                 ret = zpci_disable_device(zdev);
108                 if (ret)
109                         break;
110
111                 ret = sclp_pci_deconfigure(zdev->fid);
112                 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
113                 if (!ret)
114                         zdev->state = ZPCI_FN_STATE_STANDBY;
115
116                 break;
117         case 0x0304: /* Configured -> Standby */
118                 if (pdev) {
119                         /* Give the driver a hint that the function is
120                          * already unusable. */
121                         pdev->error_state = pci_channel_io_perm_failure;
122                         pci_stop_and_remove_bus_device_locked(pdev);
123                 }
124
125                 zdev->fh = ccdf->fh;
126                 zpci_disable_device(zdev);
127                 zdev->state = ZPCI_FN_STATE_STANDBY;
128                 break;
129         case 0x0306: /* 0x308 or 0x302 for multiple devices */
130                 clp_rescan_pci_devices();
131                 break;
132         case 0x0308: /* Standby -> Reserved */
133                 if (!zdev)
134                         break;
135                 pci_stop_root_bus(zdev->bus);
136                 pci_remove_root_bus(zdev->bus);
137                 break;
138         default:
139                 break;
140         }
141 }
142
143 void zpci_event_availability(void *data)
144 {
145         if (zpci_is_enabled())
146                 __zpci_event_availability(data);
147 }