summaryrefslogtreecommitdiffstats
path: root/drivers/char/ipmi/ipmi_si_hotmod.c
blob: 230b10e7d288a56499739013130d96a98587f119 (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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
// SPDX-License-Identifier: GPL-2.0+
/*
 * ipmi_si_hotmod.c
 *
 * Handling for dynamically adding/removing IPMI devices through
 * a module parameter (and thus sysfs).
 */

#define pr_fmt(fmt) "ipmi_hotmod: " fmt

#include <linux/moduleparam.h>
#include <linux/ipmi.h>
#include <linux/atomic.h>
#include "ipmi_si.h"
#include "ipmi_plat_data.h"

static int hotmod_handler(const char *val, const struct kernel_param *kp);

module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
MODULE_PARM_DESC(hotmod, "Add and remove interfaces.  See"
		 " Documentation/IPMI.txt in the kernel sources for the"
		 " gory details.");

/*
 * Parms come in as <op1>[:op2[:op3...]].  ops are:
 *   add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
 * Options are:
 *   rsp=<regspacing>
 *   rsi=<regsize>
 *   rsh=<regshift>
 *   irq=<irq>
 *   ipmb=<ipmb addr>
 */
enum hotmod_op { HM_ADD, HM_REMOVE };
struct hotmod_vals {
	const char *name;
	const int  val;
};

static const struct hotmod_vals hotmod_ops[] = {
	{ "add",	HM_ADD },
	{ "remove",	HM_REMOVE },
	{ NULL }
};

static const struct hotmod_vals hotmod_si[] = {
	{ "kcs",	SI_KCS },
	{ "smic",	SI_SMIC },
	{ "bt",		SI_BT },
	{ NULL }
};

static const struct hotmod_vals hotmod_as[] = {
	{ "mem",	IPMI_MEM_ADDR_SPACE },
	{ "i/o",	IPMI_IO_ADDR_SPACE },
	{ NULL }
};

static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name,
		     const char **curr)
{
	char *s;
	int  i;

	s = strchr(*curr, ',');
	if (!s) {
		pr_warn("No hotmod %s given\n", name);
		return -EINVAL;
	}
	*s = '\0';
	s++;
	for (i = 0; v[i].name; i++) {
		if (strcmp(*curr, v[i].name) == 0) {
			*val = v[i].val;
			*curr = s;
			return 0;
		}
	}

	pr_warn("Invalid hotmod %s '%s'\n", name, *curr);
	return -EINVAL;
}

static int check_hotmod_int_op(const char *curr, const char *option,
			       const char *name, unsigned int *val)
{
	char *n;

	if (strcmp(curr, name) == 0) {
		if (!option) {
			pr_warn("No option given for '%s'\n", curr);
			return -EINVAL;
		}
		*val = simple_strtoul(option, &n, 0);
		if ((*n != '\0') || (*option == '\0')) {
			pr_warn("Bad option given for '%s'\n", curr);
			return -EINVAL;
		}
		return 1;
	}
	return 0;
}

static int parse_hotmod_str(const char *curr, enum hotmod_op *op,
			    struct ipmi_plat_data *h)
{
	char *s, *o;
	int rv;
	unsigned int ival;

	rv = parse_str(hotmod_ops, &ival, "operation", &curr);
	if (rv)
		return rv;
	*op = ival;

	rv = parse_str(hotmod_si, &ival, "interface type", &curr);
	if (rv)
		return rv;
	h->type = ival;

	rv = parse_str(hotmod_as, &ival, "address space", &curr);
	if (rv)
		return rv;
	h->space = ival;

	s = strchr(curr, ',');
	if (s) {
		*s = '\0';
		s++;
	}
	rv = kstrtoul(curr, 0, &h->addr);
	if (rv) {
		pr_warn("Invalid hotmod address '%s': %d\n", curr, rv);
		return rv;
	}

	while (s) {
		curr = s;
		s = strchr(curr, ',');
		if (s) {
			*s = '\0';
			s++;
		}
		o = strchr(curr, '=');
		if (o) {
			*o = '\0';
			o++;
		}
		rv = check_hotmod_int_op(curr, o, "rsp", &h->regspacing);
		if (rv < 0)
			return rv;
		else if (rv)
			continue;
		rv = check_hotmod_int_op(curr, o, "rsi", &h->regsize);
		if (rv < 0)
			return rv;
		else if (rv)
			continue;
		rv = check_hotmod_int_op(curr, o, "rsh", &h->regshift);
		if (rv < 0)
			return rv;
		else if (rv)
			continue;
		rv = check_hotmod_int_op(curr, o, "irq", &h->irq);
		if (rv < 0)
			return rv;
		else if (rv)
			continue;
		rv = check_hotmod_int_op(curr, o, "ipmb", &h->slave_addr);
		if (rv < 0)
			return rv;
		else if (rv)
			continue;

		pr_warn("Invalid hotmod option '%s'\n", curr);
		return -EINVAL;
	}

	h->addr_source = SI_HOTMOD;
	return 0;
}

static atomic_t hotmod_nr;

static int hotmod_handler(const char *val, const struct kernel_param *kp)
{
	char *str = kstrdup(val, GFP_KERNEL), *curr, *next;
	int  rv;
	struct ipmi_plat_data h;
	unsigned int len, ival;

	if (!str)
		return -ENOMEM;

	/* Kill any trailing spaces, as we can get a "\n" from echo. */
	len = strlen(str);
	ival = len - 1;
	while ((ival >= 0) && isspace(str[ival])) {
		str[ival] = '\0';
		ival--;
	}

	for (curr = str; curr; curr = next) {
		enum hotmod_op op;

		next = strchr(curr, ':');
		if (next) {
			*next = '\0';
			next++;
		}

		memset(&h, 0, sizeof(h));
		rv = parse_hotmod_str(curr, &op, &h);
		if (rv)
			goto out;

		if (op == HM_ADD) {
			ipmi_platform_add("hotmod-ipmi-si",
					  atomic_inc_return(&hotmod_nr),
					  &h);
		} else {
			struct device *dev;

			dev = ipmi_si_remove_by_data(h.space, h.type, h.addr);
			if (dev && dev_is_platform(dev)) {
				struct platform_device *pdev;

				pdev = to_platform_device(dev);
				if (strcmp(pdev->name, "hotmod-ipmi-si") == 0)
					platform_device_unregister(pdev);
			}
			if (dev)
				put_device(dev);
		}
	}
	rv = len;
out:
	kfree(str);
	return rv;
}

static int pdev_match_name(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);

	return strcmp(pdev->name, "hotmod-ipmi-si") == 0;
}

void ipmi_si_hotmod_exit(void)
{
	struct device *dev;

	while ((dev = bus_find_device(&platform_bus_type, NULL, NULL,
				      pdev_match_name))) {
		struct platform_device *pdev = to_platform_device(dev);

		platform_device_unregister(pdev);
	}
}