Merge tag 'for-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power...
[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 = NULL;
50
51         zpci_err("error CCDF:\n");
52         zpci_err_hex(ccdf, sizeof(*ccdf));
53
54         if (zdev)
55                 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN);
56
57         pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
58                pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
59
60         if (!pdev)
61                 return;
62
63         pdev->error_state = pci_channel_io_perm_failure;
64         pci_dev_put(pdev);
65 }
66
67 void zpci_event_error(void *data)
68 {
69         if (zpci_is_enabled())
70                 __zpci_event_error(data);
71 }
72
73 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
74 {
75         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
76         struct pci_dev *pdev = NULL;
77         int ret;
78
79         if (zdev)
80                 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN);
81
82         pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
83                 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
84         zpci_err("avail CCDF:\n");
85         zpci_err_hex(ccdf, sizeof(*ccdf));
86
87         switch (ccdf->pec) {
88         case 0x0301: /* Reserved|Standby -> Configured */
89                 if (!zdev) {
90                         ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
91                         if (ret)
92                                 break;
93                         zdev = get_zdev_by_fid(ccdf->fid);
94                 }
95                 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
96                         break;
97                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
98                 zdev->fh = ccdf->fh;
99                 ret = zpci_enable_device(zdev);
100                 if (ret)
101                         break;
102                 pci_lock_rescan_remove();
103                 pci_rescan_bus(zdev->bus);
104                 pci_unlock_rescan_remove();
105                 break;
106         case 0x0302: /* Reserved -> Standby */
107                 if (!zdev)
108                         clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
109                 break;
110         case 0x0303: /* Deconfiguration requested */
111                 if (pdev)
112                         pci_stop_and_remove_bus_device_locked(pdev);
113
114                 ret = zpci_disable_device(zdev);
115                 if (ret)
116                         break;
117
118                 ret = sclp_pci_deconfigure(zdev->fid);
119                 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
120                 if (!ret)
121                         zdev->state = ZPCI_FN_STATE_STANDBY;
122
123                 break;
124         case 0x0304: /* Configured -> Standby */
125                 if (pdev) {
126                         /* Give the driver a hint that the function is
127                          * already unusable. */
128                         pdev->error_state = pci_channel_io_perm_failure;
129                         pci_stop_and_remove_bus_device_locked(pdev);
130                 }
131
132                 zdev->fh = ccdf->fh;
133                 zpci_disable_device(zdev);
134                 zdev->state = ZPCI_FN_STATE_STANDBY;
135                 break;
136         case 0x0306: /* 0x308 or 0x302 for multiple devices */
137                 clp_rescan_pci_devices();
138                 break;
139         case 0x0308: /* Standby -> Reserved */
140                 if (!zdev)
141                         break;
142                 pci_stop_root_bus(zdev->bus);
143                 pci_remove_root_bus(zdev->bus);
144                 break;
145         default:
146                 break;
147         }
148         pci_dev_put(pdev);
149 }
150
151 void zpci_event_availability(void *data)
152 {
153         if (zpci_is_enabled())
154                 __zpci_event_availability(data);
155 }