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