eef76f0e68731ce4b5a7a8244c030fa8de6447bf
[firefly-linux-kernel-4.4.55.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
58 void zpci_event_error(void *data)
59 {
60         if (zpci_is_enabled())
61                 __zpci_event_error(data);
62 }
63
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_rescan_bus(zdev->bus);
91                 break;
92         case 0x0302: /* Reserved -> Standby */
93                 if (!zdev)
94                         clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
95                 break;
96         case 0x0303: /* Deconfiguration requested */
97                 if (pdev)
98                         pci_stop_and_remove_bus_device(pdev);
99
100                 ret = zpci_disable_device(zdev);
101                 if (ret)
102                         break;
103
104                 ret = sclp_pci_deconfigure(zdev->fid);
105                 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
106                 if (!ret)
107                         zdev->state = ZPCI_FN_STATE_STANDBY;
108
109                 break;
110         case 0x0304: /* Configured -> Standby */
111                 if (pdev) {
112                         /* Give the driver a hint that the function is
113                          * already unusable. */
114                         pdev->error_state = pci_channel_io_perm_failure;
115                         pci_stop_and_remove_bus_device(pdev);
116                 }
117
118                 zdev->fh = ccdf->fh;
119                 zpci_disable_device(zdev);
120                 zdev->state = ZPCI_FN_STATE_STANDBY;
121                 break;
122         case 0x0306: /* 0x308 or 0x302 for multiple devices */
123                 clp_rescan_pci_devices();
124                 break;
125         case 0x0308: /* Standby -> Reserved */
126                 if (!zdev)
127                         break;
128                 pci_stop_root_bus(zdev->bus);
129                 pci_remove_root_bus(zdev->bus);
130                 break;
131         default:
132                 break;
133         }
134 }
135
136 void zpci_event_availability(void *data)
137 {
138         if (zpci_is_enabled())
139                 __zpci_event_availability(data);
140 }