1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * ipmi_si_hotmod.c |
4 | * |
5 | * Handling for dynamically adding/removing IPMI devices through |
6 | * a module parameter (and thus sysfs). |
7 | */ |
8 | |
9 | #define pr_fmt(fmt) "ipmi_hotmod: " fmt |
10 | |
11 | #include <linux/moduleparam.h> |
12 | #include <linux/ipmi.h> |
13 | #include <linux/atomic.h> |
14 | #include "ipmi_si.h" |
15 | #include "ipmi_plat_data.h" |
16 | |
17 | static int hotmod_handler(const char *val, const struct kernel_param *kp); |
18 | |
19 | module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200); |
20 | MODULE_PARM_DESC(hotmod, |
21 | "Add and remove interfaces. See Documentation/driver-api/ipmi.rst in the kernel sources for the gory details." ); |
22 | |
23 | /* |
24 | * Parms come in as <op1>[:op2[:op3...]]. ops are: |
25 | * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]] |
26 | * Options are: |
27 | * rsp=<regspacing> |
28 | * rsi=<regsize> |
29 | * rsh=<regshift> |
30 | * irq=<irq> |
31 | * ipmb=<ipmb addr> |
32 | */ |
33 | enum hotmod_op { HM_ADD, HM_REMOVE }; |
34 | struct hotmod_vals { |
35 | const char *name; |
36 | const int val; |
37 | }; |
38 | |
39 | static const struct hotmod_vals hotmod_ops[] = { |
40 | { "add" , HM_ADD }, |
41 | { "remove" , HM_REMOVE }, |
42 | { NULL } |
43 | }; |
44 | |
45 | static const struct hotmod_vals hotmod_si[] = { |
46 | { "kcs" , SI_KCS }, |
47 | { "smic" , SI_SMIC }, |
48 | { "bt" , SI_BT }, |
49 | { NULL } |
50 | }; |
51 | |
52 | static const struct hotmod_vals hotmod_as[] = { |
53 | { "mem" , IPMI_MEM_ADDR_SPACE }, |
54 | { "i/o" , IPMI_IO_ADDR_SPACE }, |
55 | { NULL } |
56 | }; |
57 | |
58 | static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name, |
59 | const char **curr) |
60 | { |
61 | char *s; |
62 | int i; |
63 | |
64 | s = strchr(*curr, ','); |
65 | if (!s) { |
66 | pr_warn("No hotmod %s given\n" , name); |
67 | return -EINVAL; |
68 | } |
69 | *s = '\0'; |
70 | s++; |
71 | for (i = 0; v[i].name; i++) { |
72 | if (strcmp(*curr, v[i].name) == 0) { |
73 | *val = v[i].val; |
74 | *curr = s; |
75 | return 0; |
76 | } |
77 | } |
78 | |
79 | pr_warn("Invalid hotmod %s '%s'\n" , name, *curr); |
80 | return -EINVAL; |
81 | } |
82 | |
83 | static int check_hotmod_int_op(const char *curr, const char *option, |
84 | const char *name, unsigned int *val) |
85 | { |
86 | char *n; |
87 | |
88 | if (strcmp(curr, name) == 0) { |
89 | if (!option) { |
90 | pr_warn("No option given for '%s'\n" , curr); |
91 | return -EINVAL; |
92 | } |
93 | *val = simple_strtoul(option, &n, 0); |
94 | if ((*n != '\0') || (*option == '\0')) { |
95 | pr_warn("Bad option given for '%s'\n" , curr); |
96 | return -EINVAL; |
97 | } |
98 | return 1; |
99 | } |
100 | return 0; |
101 | } |
102 | |
103 | static int parse_hotmod_str(const char *curr, enum hotmod_op *op, |
104 | struct ipmi_plat_data *h) |
105 | { |
106 | char *s, *o; |
107 | int rv; |
108 | unsigned int ival; |
109 | |
110 | h->iftype = IPMI_PLAT_IF_SI; |
111 | rv = parse_str(v: hotmod_ops, val: &ival, name: "operation" , curr: &curr); |
112 | if (rv) |
113 | return rv; |
114 | *op = ival; |
115 | |
116 | rv = parse_str(v: hotmod_si, val: &ival, name: "interface type" , curr: &curr); |
117 | if (rv) |
118 | return rv; |
119 | h->type = ival; |
120 | |
121 | rv = parse_str(v: hotmod_as, val: &ival, name: "address space" , curr: &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(s: curr, base: 0, res: &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, option: o, name: "rsp" , val: &h->regspacing); |
150 | if (rv < 0) |
151 | return rv; |
152 | else if (rv) |
153 | continue; |
154 | rv = check_hotmod_int_op(curr, option: o, name: "rsi" , val: &h->regsize); |
155 | if (rv < 0) |
156 | return rv; |
157 | else if (rv) |
158 | continue; |
159 | rv = check_hotmod_int_op(curr, option: o, name: "rsh" , val: &h->regshift); |
160 | if (rv < 0) |
161 | return rv; |
162 | else if (rv) |
163 | continue; |
164 | rv = check_hotmod_int_op(curr, option: o, name: "irq" , val: &h->irq); |
165 | if (rv < 0) |
166 | return rv; |
167 | else if (rv) |
168 | continue; |
169 | rv = check_hotmod_int_op(curr, option: o, name: "ipmb" , val: &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 | |
185 | static int hotmod_handler(const char *val, const struct kernel_param *kp) |
186 | { |
187 | int rv; |
188 | struct ipmi_plat_data h; |
189 | char *str, *curr, *next; |
190 | |
191 | str = kstrdup(s: val, GFP_KERNEL); |
192 | if (!str) |
193 | return -ENOMEM; |
194 | |
195 | /* Kill any trailing spaces, as we can get a "\n" from echo. */ |
196 | for (curr = strstrip(str); curr; curr = next) { |
197 | enum hotmod_op op; |
198 | |
199 | next = strchr(curr, ':'); |
200 | if (next) { |
201 | *next = '\0'; |
202 | next++; |
203 | } |
204 | |
205 | memset(&h, 0, sizeof(h)); |
206 | rv = parse_hotmod_str(curr, op: &op, h: &h); |
207 | if (rv) |
208 | goto out; |
209 | |
210 | if (op == HM_ADD) { |
211 | ipmi_platform_add(name: "hotmod-ipmi-si" , |
212 | inst: atomic_inc_return(v: &hotmod_nr), |
213 | p: &h); |
214 | } else { |
215 | struct device *dev; |
216 | |
217 | dev = ipmi_si_remove_by_data(addr_space: h.space, si_type: h.type, addr: h.addr); |
218 | if (dev && dev_is_platform(dev)) { |
219 | struct platform_device *pdev; |
220 | |
221 | pdev = to_platform_device(dev); |
222 | if (strcmp(pdev->name, "hotmod-ipmi-si" ) == 0) |
223 | platform_device_unregister(pdev); |
224 | } |
225 | put_device(dev); |
226 | } |
227 | } |
228 | rv = strlen(val); |
229 | out: |
230 | kfree(objp: str); |
231 | return rv; |
232 | } |
233 | |
234 | void ipmi_si_hotmod_exit(void) |
235 | { |
236 | ipmi_remove_platform_device_by_name(name: "hotmod-ipmi-si" ); |
237 | } |
238 | |