Merge tag 'for-linus-5.14-1' of git://github.com/cminyard/linux-ipmi
[linux-2.6-microblaze.git] / arch / s390 / pci / pci_event.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  Copyright IBM Corp. 2012
4  *
5  *  Author(s):
6  *    Jan Glauber <jang@linux.vnet.ibm.com>
7  */
8
9 #define KMSG_COMPONENT "zpci"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
14 #include <asm/pci_debug.h>
15 #include <asm/pci_dma.h>
16 #include <asm/sclp.h>
17
18 #include "pci_bus.h"
19
20 /* Content Code Description for PCI Function Error */
21 struct zpci_ccdf_err {
22         u32 reserved1;
23         u32 fh;                         /* function handle */
24         u32 fid;                        /* function id */
25         u32 ett         :  4;           /* expected table type */
26         u32 mvn         : 12;           /* MSI vector number */
27         u32 dmaas       :  8;           /* DMA address space */
28         u32             :  6;
29         u32 q           :  1;           /* event qualifier */
30         u32 rw          :  1;           /* read/write */
31         u64 faddr;                      /* failing address */
32         u32 reserved3;
33         u16 reserved4;
34         u16 pec;                        /* PCI event code */
35 } __packed;
36
37 /* Content Code Description for PCI Function Availability */
38 struct zpci_ccdf_avail {
39         u32 reserved1;
40         u32 fh;                         /* function handle */
41         u32 fid;                        /* function id */
42         u32 reserved2;
43         u32 reserved3;
44         u32 reserved4;
45         u32 reserved5;
46         u16 reserved6;
47         u16 pec;                        /* PCI event code */
48 } __packed;
49
50 static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
51 {
52         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
53         struct pci_dev *pdev = NULL;
54
55         zpci_err("error CCDF:\n");
56         zpci_err_hex(ccdf, sizeof(*ccdf));
57
58         if (zdev)
59                 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
60
61         pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
62                pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
63
64         if (!pdev)
65                 return;
66
67         pdev->error_state = pci_channel_io_perm_failure;
68         pci_dev_put(pdev);
69 }
70
71 void zpci_event_error(void *data)
72 {
73         if (zpci_is_enabled())
74                 __zpci_event_error(data);
75 }
76
77 static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh)
78 {
79         zdev->fh = fh;
80         /* Give the driver a hint that the function is
81          * already unusable.
82          */
83         zpci_bus_remove_device(zdev, true);
84         /* Even though the device is already gone we still
85          * need to free zPCI resources as part of the disable.
86          */
87         zpci_disable_device(zdev);
88         zdev->state = ZPCI_FN_STATE_STANDBY;
89 }
90
91 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
92 {
93         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
94         enum zpci_state state;
95
96         zpci_err("avail CCDF:\n");
97         zpci_err_hex(ccdf, sizeof(*ccdf));
98
99         switch (ccdf->pec) {
100         case 0x0301: /* Reserved|Standby -> Configured */
101                 if (!zdev) {
102                         zdev = zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
103                         if (IS_ERR(zdev))
104                                 break;
105                 } else {
106                         /* the configuration request may be stale */
107                         if (zdev->state != ZPCI_FN_STATE_STANDBY)
108                                 break;
109                         zdev->state = ZPCI_FN_STATE_CONFIGURED;
110                 }
111                 zpci_scan_configured_device(zdev, ccdf->fh);
112                 break;
113         case 0x0302: /* Reserved -> Standby */
114                 if (!zdev)
115                         zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
116                 else
117                         zdev->fh = ccdf->fh;
118                 break;
119         case 0x0303: /* Deconfiguration requested */
120                 if (zdev) {
121                         /* The event may have been queued before we confirgured
122                          * the device.
123                          */
124                         if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
125                                 break;
126                         zdev->fh = ccdf->fh;
127                         zpci_deconfigure_device(zdev);
128                 }
129                 break;
130         case 0x0304: /* Configured -> Standby|Reserved */
131                 if (zdev) {
132                         /* The event may have been queued before we confirgured
133                          * the device.:
134                          */
135                         if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
136                                 zpci_event_hard_deconfigured(zdev, ccdf->fh);
137                         /* The 0x0304 event may immediately reserve the device */
138                         if (!clp_get_state(zdev->fid, &state) &&
139                             state == ZPCI_FN_STATE_RESERVED) {
140                                 zpci_zdev_put(zdev);
141                         }
142                 }
143                 break;
144         case 0x0306: /* 0x308 or 0x302 for multiple devices */
145                 zpci_remove_reserved_devices();
146                 clp_scan_pci_devices();
147                 break;
148         case 0x0308: /* Standby -> Reserved */
149                 if (!zdev)
150                         break;
151                 zpci_zdev_put(zdev);
152                 break;
153         default:
154                 break;
155         }
156 }
157
158 void zpci_event_availability(void *data)
159 {
160         if (zpci_is_enabled())
161                 __zpci_event_availability(data);
162 }