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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / s390 / char / sclp_pci.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * PCI I/O adapter configuration related functions.
4  *
5  * Copyright IBM Corp. 2016
6  */
7 #define KMSG_COMPONENT "sclp_cmd"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10 #include <linux/completion.h>
11 #include <linux/export.h>
12 #include <linux/mutex.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/err.h>
17
18 #include <asm/sclp.h>
19
20 #include "sclp.h"
21
22 #define SCLP_CMDW_CONFIGURE_PCI                 0x001a0001
23 #define SCLP_CMDW_DECONFIGURE_PCI               0x001b0001
24
25 #define SCLP_ATYPE_PCI                          2
26
27 #define SCLP_ERRNOTIFY_AQ_RESET                 0
28 #define SCLP_ERRNOTIFY_AQ_REPAIR                1
29 #define SCLP_ERRNOTIFY_AQ_INFO_LOG              2
30 #define SCLP_ERRNOTIFY_AQ_OPTICS_DATA           3
31
32 static DEFINE_MUTEX(sclp_pci_mutex);
33 static struct sclp_register sclp_pci_event = {
34         .send_mask = EVTYP_ERRNOTIFY_MASK,
35 };
36
37 struct err_notify_evbuf {
38         struct evbuf_header header;
39         u8 action;
40         u8 atype;
41         u32 fh;
42         u32 fid;
43         u8 data[];
44 } __packed;
45
46 struct err_notify_sccb {
47         struct sccb_header header;
48         struct err_notify_evbuf evbuf;
49 } __packed;
50
51 struct pci_cfg_sccb {
52         struct sccb_header header;
53         u8 atype;               /* adapter type */
54         u8 reserved1;
55         u16 reserved2;
56         u32 aid;                /* adapter identifier */
57 } __packed;
58
59 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
60 {
61         struct pci_cfg_sccb *sccb;
62         int rc;
63
64         if (!SCLP_HAS_PCI_RECONFIG)
65                 return -EOPNOTSUPP;
66
67         sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
68         if (!sccb)
69                 return -ENOMEM;
70
71         sccb->header.length = PAGE_SIZE;
72         sccb->atype = SCLP_ATYPE_PCI;
73         sccb->aid = fid;
74         rc = sclp_sync_request(cmd, sccb);
75         if (rc)
76                 goto out;
77         switch (sccb->header.response_code) {
78         case 0x0020:
79         case 0x0120:
80                 break;
81         default:
82                 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
83                         cmd, sccb->header.response_code);
84                 rc = -EIO;
85                 break;
86         }
87 out:
88         free_page((unsigned long) sccb);
89         return rc;
90 }
91
92 int sclp_pci_configure(u32 fid)
93 {
94         return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
95 }
96 EXPORT_SYMBOL(sclp_pci_configure);
97
98 int sclp_pci_deconfigure(u32 fid)
99 {
100         return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
101 }
102 EXPORT_SYMBOL(sclp_pci_deconfigure);
103
104 static void sclp_pci_callback(struct sclp_req *req, void *data)
105 {
106         struct completion *completion = data;
107
108         complete(completion);
109 }
110
111 static int sclp_pci_check_report(struct zpci_report_error_header *report)
112 {
113         if (report->version != 1)
114                 return -EINVAL;
115
116         switch (report->action) {
117         case SCLP_ERRNOTIFY_AQ_RESET:
118         case SCLP_ERRNOTIFY_AQ_REPAIR:
119         case SCLP_ERRNOTIFY_AQ_INFO_LOG:
120         case SCLP_ERRNOTIFY_AQ_OPTICS_DATA:
121                 break;
122         default:
123                 return -EINVAL;
124         }
125
126         if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb)))
127                 return -EINVAL;
128
129         return 0;
130 }
131
132 int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid)
133 {
134         DECLARE_COMPLETION_ONSTACK(completion);
135         struct err_notify_sccb *sccb;
136         struct sclp_req req;
137         int ret;
138
139         ret = sclp_pci_check_report(report);
140         if (ret)
141                 return ret;
142
143         mutex_lock(&sclp_pci_mutex);
144         ret = sclp_register(&sclp_pci_event);
145         if (ret)
146                 goto out_unlock;
147
148         if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) {
149                 ret = -EOPNOTSUPP;
150                 goto out_unregister;
151         }
152
153         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
154         if (!sccb) {
155                 ret = -ENOMEM;
156                 goto out_unregister;
157         }
158
159         memset(&req, 0, sizeof(req));
160         req.callback_data = &completion;
161         req.callback = sclp_pci_callback;
162         req.command = SCLP_CMDW_WRITE_EVENT_DATA;
163         req.status = SCLP_REQ_FILLED;
164         req.sccb = sccb;
165
166         sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length;
167         sccb->evbuf.header.type = EVTYP_ERRNOTIFY;
168         sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length;
169
170         sccb->evbuf.action = report->action;
171         sccb->evbuf.atype = SCLP_ATYPE_PCI;
172         sccb->evbuf.fh = fh;
173         sccb->evbuf.fid = fid;
174
175         memcpy(sccb->evbuf.data, report->data, report->length);
176
177         ret = sclp_add_request(&req);
178         if (ret)
179                 goto out_free_req;
180
181         wait_for_completion(&completion);
182         if (req.status != SCLP_REQ_DONE) {
183                 pr_warn("request failed (status=0x%02x)\n",
184                         req.status);
185                 ret = -EIO;
186                 goto out_free_req;
187         }
188
189         if (sccb->header.response_code != 0x0020) {
190                 pr_warn("request failed with response code 0x%x\n",
191                         sccb->header.response_code);
192                 ret = -EIO;
193         }
194
195 out_free_req:
196         free_page((unsigned long) sccb);
197 out_unregister:
198         sclp_unregister(&sclp_pci_event);
199 out_unlock:
200         mutex_unlock(&sclp_pci_mutex);
201         return ret;
202 }
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