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
31 static DEFINE_MUTEX(sclp_pci_mutex);
32 static struct sclp_register sclp_pci_event = {
33 .send_mask = EVTYP_ERRNOTIFY_MASK,
34 };
35
36 struct err_notify_evbuf {
37 struct evbuf_header header;
38 u8 action;
39 u8 atype;
40 u32 fh;
41 u32 fid;
42 u8 data[];
43 } __packed;
44
45 struct err_notify_sccb {
46 struct sccb_header header;
47 struct err_notify_evbuf evbuf;
48 } __packed;
49
50 struct pci_cfg_sccb {
51 struct sccb_header header;
52 u8 atype; /* adapter type */
53 u8 reserved1;
54 u16 reserved2;
55 u32 aid; /* adapter identifier */
56 } __packed;
57
do_pci_configure(sclp_cmdw_t cmd,u32 fid)58 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
59 {
60 struct pci_cfg_sccb *sccb;
61 int rc;
62
63 if (!SCLP_HAS_PCI_RECONFIG)
64 return -EOPNOTSUPP;
65
66 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
67 if (!sccb)
68 return -ENOMEM;
69
70 sccb->header.length = PAGE_SIZE;
71 sccb->atype = SCLP_ATYPE_PCI;
72 sccb->aid = fid;
73 rc = sclp_sync_request(cmd, sccb);
74 if (rc)
75 goto out;
76 switch (sccb->header.response_code) {
77 case 0x0020:
78 case 0x0120:
79 break;
80 default:
81 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
82 cmd, sccb->header.response_code);
83 rc = -EIO;
84 break;
85 }
86 out:
87 free_page((unsigned long) sccb);
88 return rc;
89 }
90
sclp_pci_configure(u32 fid)91 int sclp_pci_configure(u32 fid)
92 {
93 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
94 }
95 EXPORT_SYMBOL(sclp_pci_configure);
96
sclp_pci_deconfigure(u32 fid)97 int sclp_pci_deconfigure(u32 fid)
98 {
99 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
100 }
101 EXPORT_SYMBOL(sclp_pci_deconfigure);
102
sclp_pci_callback(struct sclp_req * req,void * data)103 static void sclp_pci_callback(struct sclp_req *req, void *data)
104 {
105 struct completion *completion = data;
106
107 complete(completion);
108 }
109
sclp_pci_check_report(struct zpci_report_error_header * report)110 static int sclp_pci_check_report(struct zpci_report_error_header *report)
111 {
112 if (report->version != 1)
113 return -EINVAL;
114
115 switch (report->action) {
116 case SCLP_ERRNOTIFY_AQ_RESET:
117 case SCLP_ERRNOTIFY_AQ_REPAIR:
118 case SCLP_ERRNOTIFY_AQ_INFO_LOG:
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb)))
125 return -EINVAL;
126
127 return 0;
128 }
129
sclp_pci_report(struct zpci_report_error_header * report,u32 fh,u32 fid)130 int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid)
131 {
132 DECLARE_COMPLETION_ONSTACK(completion);
133 struct err_notify_sccb *sccb;
134 struct sclp_req req;
135 int ret;
136
137 ret = sclp_pci_check_report(report);
138 if (ret)
139 return ret;
140
141 mutex_lock(&sclp_pci_mutex);
142 ret = sclp_register(&sclp_pci_event);
143 if (ret)
144 goto out_unlock;
145
146 if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) {
147 ret = -EOPNOTSUPP;
148 goto out_unregister;
149 }
150
151 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
152 if (!sccb) {
153 ret = -ENOMEM;
154 goto out_unregister;
155 }
156
157 memset(&req, 0, sizeof(req));
158 req.callback_data = &completion;
159 req.callback = sclp_pci_callback;
160 req.command = SCLP_CMDW_WRITE_EVENT_DATA;
161 req.status = SCLP_REQ_FILLED;
162 req.sccb = sccb;
163
164 sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length;
165 sccb->evbuf.header.type = EVTYP_ERRNOTIFY;
166 sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length;
167
168 sccb->evbuf.action = report->action;
169 sccb->evbuf.atype = SCLP_ATYPE_PCI;
170 sccb->evbuf.fh = fh;
171 sccb->evbuf.fid = fid;
172
173 memcpy(sccb->evbuf.data, report->data, report->length);
174
175 ret = sclp_add_request(&req);
176 if (ret)
177 goto out_free_req;
178
179 wait_for_completion(&completion);
180 if (req.status != SCLP_REQ_DONE) {
181 pr_warn("request failed (status=0x%02x)\n",
182 req.status);
183 ret = -EIO;
184 goto out_free_req;
185 }
186
187 if (sccb->header.response_code != 0x0020) {
188 pr_warn("request failed with response code 0x%x\n",
189 sccb->header.response_code);
190 ret = -EIO;
191 }
192
193 out_free_req:
194 free_page((unsigned long) sccb);
195 out_unregister:
196 sclp_unregister(&sclp_pci_event);
197 out_unlock:
198 mutex_unlock(&sclp_pci_mutex);
199 return ret;
200 }
201