summaryrefslogtreecommitdiff
path: root/drivers/s390/char/sclp_pci.c
blob: a3e5a5fb0c1e736134c704fbe6f78faeec66d972 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
// SPDX-License-Identifier: GPL-2.0
/*
 * PCI I/O adapter configuration related functions.
 *
 * Copyright IBM Corp. 2016
 */
#define KMSG_COMPONENT "sclp_cmd"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/completion.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>

#include <asm/sclp.h>

#include "sclp.h"

#define SCLP_CMDW_CONFIGURE_PCI			0x001a0001
#define SCLP_CMDW_DECONFIGURE_PCI		0x001b0001

#define SCLP_ATYPE_PCI				2

#define SCLP_ERRNOTIFY_AQ_RESET			0
#define SCLP_ERRNOTIFY_AQ_REPAIR		1
#define SCLP_ERRNOTIFY_AQ_INFO_LOG		2

static DEFINE_MUTEX(sclp_pci_mutex);
static struct sclp_register sclp_pci_event = {
	.send_mask = EVTYP_ERRNOTIFY_MASK,
};

struct err_notify_evbuf {
	struct evbuf_header header;
	u8 action;
	u8 atype;
	u32 fh;
	u32 fid;
	u8 data[];
} __packed;

struct err_notify_sccb {
	struct sccb_header header;
	struct err_notify_evbuf evbuf;
} __packed;

struct pci_cfg_sccb {
	struct sccb_header header;
	u8 atype;		/* adapter type */
	u8 reserved1;
	u16 reserved2;
	u32 aid;		/* adapter identifier */
} __packed;

static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
{
	struct pci_cfg_sccb *sccb;
	int rc;

	if (!SCLP_HAS_PCI_RECONFIG)
		return -EOPNOTSUPP;

	sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;

	sccb->header.length = PAGE_SIZE;
	sccb->atype = SCLP_ATYPE_PCI;
	sccb->aid = fid;
	rc = sclp_sync_request(cmd, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
	case 0x0120:
		break;
	default:
		pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
			cmd, sccb->header.response_code);
		rc = -EIO;
		break;
	}
out:
	free_page((unsigned long) sccb);
	return rc;
}

int sclp_pci_configure(u32 fid)
{
	return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_configure);

int sclp_pci_deconfigure(u32 fid)
{
	return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_deconfigure);

static void sclp_pci_callback(struct sclp_req *req, void *data)
{
	struct completion *completion = data;

	complete(completion);
}

static int sclp_pci_check_report(struct zpci_report_error_header *report)
{
	if (report->version != 1)
		return -EINVAL;

	switch (report->action) {
	case SCLP_ERRNOTIFY_AQ_RESET:
	case SCLP_ERRNOTIFY_AQ_REPAIR:
	case SCLP_ERRNOTIFY_AQ_INFO_LOG:
		break;
	default:
		return -EINVAL;
	}

	if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb)))
		return -EINVAL;

	return 0;
}

int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid)
{
	DECLARE_COMPLETION_ONSTACK(completion);
	struct err_notify_sccb *sccb;
	struct sclp_req req;
	int ret;

	ret = sclp_pci_check_report(report);
	if (ret)
		return ret;

	mutex_lock(&sclp_pci_mutex);
	ret = sclp_register(&sclp_pci_event);
	if (ret)
		goto out_unlock;

	if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) {
		ret = -EOPNOTSUPP;
		goto out_unregister;
	}

	sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb) {
		ret = -ENOMEM;
		goto out_unregister;
	}

	memset(&req, 0, sizeof(req));
	req.callback_data = &completion;
	req.callback = sclp_pci_callback;
	req.command = SCLP_CMDW_WRITE_EVENT_DATA;
	req.status = SCLP_REQ_FILLED;
	req.sccb = sccb;

	sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length;
	sccb->evbuf.header.type = EVTYP_ERRNOTIFY;
	sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length;

	sccb->evbuf.action = report->action;
	sccb->evbuf.atype = SCLP_ATYPE_PCI;
	sccb->evbuf.fh = fh;
	sccb->evbuf.fid = fid;

	memcpy(sccb->evbuf.data, report->data, report->length);

	ret = sclp_add_request(&req);
	if (ret)
		goto out_free_req;

	wait_for_completion(&completion);
	if (req.status != SCLP_REQ_DONE) {
		pr_warn("request failed (status=0x%02x)\n",
			req.status);
		ret = -EIO;
		goto out_free_req;
	}

	if (sccb->header.response_code != 0x0020) {
		pr_warn("request failed with response code 0x%x\n",
			sccb->header.response_code);
		ret = -EIO;
	}

out_free_req:
	free_page((unsigned long) sccb);
out_unregister:
	sclp_unregister(&sclp_pci_event);
out_unlock:
	mutex_unlock(&sclp_pci_mutex);
	return ret;
}