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243ac210 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
44814ec9 CM |
2 | /* |
3 | * ipmi_si_hotmod.c | |
4 | * | |
5 | * Handling for dynamically adding/removing IPMI devices through | |
6 | * a module parameter (and thus sysfs). | |
7 | */ | |
25880f7d JP |
8 | |
9 | #define pr_fmt(fmt) "ipmi_hotmod: " fmt | |
10 | ||
44814ec9 CM |
11 | #include <linux/moduleparam.h> |
12 | #include <linux/ipmi.h> | |
3bb8ea40 | 13 | #include <linux/atomic.h> |
44814ec9 | 14 | #include "ipmi_si.h" |
3bb8ea40 | 15 | #include "ipmi_plat_data.h" |
44814ec9 | 16 | |
6297fabd | 17 | static int hotmod_handler(const char *val, const struct kernel_param *kp); |
44814ec9 CM |
18 | |
19 | module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200); | |
20 | MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See" | |
21 | " Documentation/IPMI.txt in the kernel sources for the" | |
22 | " gory details."); | |
23 | ||
24 | /* | |
25 | * Parms come in as <op1>[:op2[:op3...]]. ops are: | |
26 | * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]] | |
27 | * Options are: | |
28 | * rsp=<regspacing> | |
29 | * rsi=<regsize> | |
30 | * rsh=<regshift> | |
31 | * irq=<irq> | |
32 | * ipmb=<ipmb addr> | |
33 | */ | |
34 | enum hotmod_op { HM_ADD, HM_REMOVE }; | |
35 | struct hotmod_vals { | |
36 | const char *name; | |
37 | const int val; | |
38 | }; | |
39 | ||
40 | static const struct hotmod_vals hotmod_ops[] = { | |
41 | { "add", HM_ADD }, | |
42 | { "remove", HM_REMOVE }, | |
43 | { NULL } | |
44 | }; | |
45 | ||
46 | static const struct hotmod_vals hotmod_si[] = { | |
47 | { "kcs", SI_KCS }, | |
48 | { "smic", SI_SMIC }, | |
49 | { "bt", SI_BT }, | |
50 | { NULL } | |
51 | }; | |
52 | ||
53 | static const struct hotmod_vals hotmod_as[] = { | |
54 | { "mem", IPMI_MEM_ADDR_SPACE }, | |
55 | { "i/o", IPMI_IO_ADDR_SPACE }, | |
56 | { NULL } | |
57 | }; | |
58 | ||
3bb8ea40 CM |
59 | static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name, |
60 | const char **curr) | |
44814ec9 CM |
61 | { |
62 | char *s; | |
63 | int i; | |
64 | ||
65 | s = strchr(*curr, ','); | |
66 | if (!s) { | |
25880f7d | 67 | pr_warn("No hotmod %s given\n", name); |
44814ec9 CM |
68 | return -EINVAL; |
69 | } | |
70 | *s = '\0'; | |
71 | s++; | |
72 | for (i = 0; v[i].name; i++) { | |
73 | if (strcmp(*curr, v[i].name) == 0) { | |
74 | *val = v[i].val; | |
75 | *curr = s; | |
76 | return 0; | |
77 | } | |
78 | } | |
79 | ||
25880f7d | 80 | pr_warn("Invalid hotmod %s '%s'\n", name, *curr); |
44814ec9 CM |
81 | return -EINVAL; |
82 | } | |
83 | ||
84 | static int check_hotmod_int_op(const char *curr, const char *option, | |
3bb8ea40 | 85 | const char *name, unsigned int *val) |
44814ec9 CM |
86 | { |
87 | char *n; | |
88 | ||
89 | if (strcmp(curr, name) == 0) { | |
90 | if (!option) { | |
25880f7d | 91 | pr_warn("No option given for '%s'\n", curr); |
44814ec9 CM |
92 | return -EINVAL; |
93 | } | |
94 | *val = simple_strtoul(option, &n, 0); | |
95 | if ((*n != '\0') || (*option == '\0')) { | |
25880f7d | 96 | pr_warn("Bad option given for '%s'\n", curr); |
44814ec9 CM |
97 | return -EINVAL; |
98 | } | |
99 | return 1; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
3bb8ea40 CM |
104 | static int parse_hotmod_str(const char *curr, enum hotmod_op *op, |
105 | struct ipmi_plat_data *h) | |
106 | { | |
107 | char *s, *o; | |
108 | int rv; | |
109 | unsigned int ival; | |
110 | ||
111 | rv = parse_str(hotmod_ops, &ival, "operation", &curr); | |
112 | if (rv) | |
113 | return rv; | |
114 | *op = ival; | |
115 | ||
116 | rv = parse_str(hotmod_si, &ival, "interface type", &curr); | |
117 | if (rv) | |
118 | return rv; | |
119 | h->type = ival; | |
120 | ||
121 | rv = parse_str(hotmod_as, &ival, "address space", &curr); | |
122 | if (rv) | |
123 | return rv; | |
124 | h->space = ival; | |
125 | ||
126 | s = strchr(curr, ','); | |
127 | if (s) { | |
128 | *s = '\0'; | |
129 | s++; | |
130 | } | |
131 | rv = kstrtoul(curr, 0, &h->addr); | |
132 | if (rv) { | |
133 | pr_warn("Invalid hotmod address '%s': %d\n", curr, rv); | |
134 | return rv; | |
135 | } | |
136 | ||
137 | while (s) { | |
138 | curr = s; | |
139 | s = strchr(curr, ','); | |
140 | if (s) { | |
141 | *s = '\0'; | |
142 | s++; | |
143 | } | |
144 | o = strchr(curr, '='); | |
145 | if (o) { | |
146 | *o = '\0'; | |
147 | o++; | |
148 | } | |
149 | rv = check_hotmod_int_op(curr, o, "rsp", &h->regspacing); | |
150 | if (rv < 0) | |
151 | return rv; | |
152 | else if (rv) | |
153 | continue; | |
154 | rv = check_hotmod_int_op(curr, o, "rsi", &h->regsize); | |
155 | if (rv < 0) | |
156 | return rv; | |
157 | else if (rv) | |
158 | continue; | |
159 | rv = check_hotmod_int_op(curr, o, "rsh", &h->regshift); | |
160 | if (rv < 0) | |
161 | return rv; | |
162 | else if (rv) | |
163 | continue; | |
164 | rv = check_hotmod_int_op(curr, o, "irq", &h->irq); | |
165 | if (rv < 0) | |
166 | return rv; | |
167 | else if (rv) | |
168 | continue; | |
169 | rv = check_hotmod_int_op(curr, o, "ipmb", &h->slave_addr); | |
170 | if (rv < 0) | |
171 | return rv; | |
172 | else if (rv) | |
173 | continue; | |
174 | ||
175 | pr_warn("Invalid hotmod option '%s'\n", curr); | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
179 | h->addr_source = SI_HOTMOD; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static atomic_t hotmod_nr; | |
184 | ||
6297fabd | 185 | static int hotmod_handler(const char *val, const struct kernel_param *kp) |
44814ec9 | 186 | { |
3bb8ea40 | 187 | char *str = kstrdup(val, GFP_KERNEL), *curr, *next; |
44814ec9 | 188 | int rv; |
3bb8ea40 CM |
189 | struct ipmi_plat_data h; |
190 | unsigned int len, ival; | |
44814ec9 CM |
191 | |
192 | if (!str) | |
193 | return -ENOMEM; | |
194 | ||
195 | /* Kill any trailing spaces, as we can get a "\n" from echo. */ | |
196 | len = strlen(str); | |
197 | ival = len - 1; | |
198 | while ((ival >= 0) && isspace(str[ival])) { | |
199 | str[ival] = '\0'; | |
200 | ival--; | |
201 | } | |
202 | ||
203 | for (curr = str; curr; curr = next) { | |
3bb8ea40 | 204 | enum hotmod_op op; |
44814ec9 CM |
205 | |
206 | next = strchr(curr, ':'); | |
207 | if (next) { | |
208 | *next = '\0'; | |
209 | next++; | |
210 | } | |
211 | ||
3bb8ea40 CM |
212 | memset(&h, 0, sizeof(h)); |
213 | rv = parse_hotmod_str(curr, &op, &h); | |
44814ec9 | 214 | if (rv) |
44814ec9 | 215 | goto out; |
44814ec9 CM |
216 | |
217 | if (op == HM_ADD) { | |
3bb8ea40 CM |
218 | ipmi_platform_add("hotmod-ipmi-si", |
219 | atomic_inc_return(&hotmod_nr), | |
220 | &h); | |
44814ec9 | 221 | } else { |
3bb8ea40 | 222 | ipmi_si_remove_by_data(h.space, h.type, h.addr); |
44814ec9 CM |
223 | } |
224 | } | |
225 | rv = len; | |
226 | out: | |
227 | kfree(str); | |
228 | return rv; | |
229 | } |