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3bb8ea400c
Don't force the main code to create one for it. Signed-off-by: Corey Minyard <cminyard@mvista.com>
230 lines
4.4 KiB
C
230 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ipmi_si_hotmod.c
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*
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* Handling for dynamically adding/removing IPMI devices through
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* a module parameter (and thus sysfs).
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*/
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#define pr_fmt(fmt) "ipmi_hotmod: " fmt
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#include <linux/moduleparam.h>
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#include <linux/ipmi.h>
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#include <linux/atomic.h>
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#include "ipmi_si.h"
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#include "ipmi_plat_data.h"
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static int hotmod_handler(const char *val, const struct kernel_param *kp);
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module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
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MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
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" Documentation/IPMI.txt in the kernel sources for the"
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" gory details.");
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/*
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* Parms come in as <op1>[:op2[:op3...]]. ops are:
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* add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
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* Options are:
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* rsp=<regspacing>
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* rsi=<regsize>
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* rsh=<regshift>
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* irq=<irq>
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* ipmb=<ipmb addr>
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*/
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enum hotmod_op { HM_ADD, HM_REMOVE };
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struct hotmod_vals {
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const char *name;
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const int val;
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};
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static const struct hotmod_vals hotmod_ops[] = {
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{ "add", HM_ADD },
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{ "remove", HM_REMOVE },
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{ NULL }
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};
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static const struct hotmod_vals hotmod_si[] = {
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{ "kcs", SI_KCS },
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{ "smic", SI_SMIC },
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{ "bt", SI_BT },
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{ NULL }
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};
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static const struct hotmod_vals hotmod_as[] = {
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{ "mem", IPMI_MEM_ADDR_SPACE },
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{ "i/o", IPMI_IO_ADDR_SPACE },
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{ NULL }
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};
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static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name,
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const char **curr)
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{
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char *s;
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int i;
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s = strchr(*curr, ',');
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if (!s) {
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pr_warn("No hotmod %s given\n", name);
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return -EINVAL;
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}
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*s = '\0';
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s++;
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for (i = 0; v[i].name; i++) {
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if (strcmp(*curr, v[i].name) == 0) {
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*val = v[i].val;
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*curr = s;
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return 0;
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}
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}
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pr_warn("Invalid hotmod %s '%s'\n", name, *curr);
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return -EINVAL;
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}
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static int check_hotmod_int_op(const char *curr, const char *option,
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const char *name, unsigned int *val)
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{
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char *n;
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if (strcmp(curr, name) == 0) {
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if (!option) {
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pr_warn("No option given for '%s'\n", curr);
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return -EINVAL;
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}
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*val = simple_strtoul(option, &n, 0);
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if ((*n != '\0') || (*option == '\0')) {
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pr_warn("Bad option given for '%s'\n", curr);
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return -EINVAL;
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}
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return 1;
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}
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return 0;
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}
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static int parse_hotmod_str(const char *curr, enum hotmod_op *op,
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struct ipmi_plat_data *h)
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{
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char *s, *o;
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int rv;
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unsigned int ival;
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rv = parse_str(hotmod_ops, &ival, "operation", &curr);
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if (rv)
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return rv;
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*op = ival;
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rv = parse_str(hotmod_si, &ival, "interface type", &curr);
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if (rv)
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return rv;
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h->type = ival;
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rv = parse_str(hotmod_as, &ival, "address space", &curr);
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if (rv)
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return rv;
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h->space = ival;
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s = strchr(curr, ',');
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if (s) {
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*s = '\0';
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s++;
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}
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rv = kstrtoul(curr, 0, &h->addr);
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if (rv) {
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pr_warn("Invalid hotmod address '%s': %d\n", curr, rv);
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return rv;
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}
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while (s) {
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curr = s;
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s = strchr(curr, ',');
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if (s) {
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*s = '\0';
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s++;
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}
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o = strchr(curr, '=');
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if (o) {
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*o = '\0';
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o++;
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}
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rv = check_hotmod_int_op(curr, o, "rsp", &h->regspacing);
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if (rv < 0)
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return rv;
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else if (rv)
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continue;
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rv = check_hotmod_int_op(curr, o, "rsi", &h->regsize);
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if (rv < 0)
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return rv;
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else if (rv)
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continue;
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rv = check_hotmod_int_op(curr, o, "rsh", &h->regshift);
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if (rv < 0)
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return rv;
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else if (rv)
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continue;
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rv = check_hotmod_int_op(curr, o, "irq", &h->irq);
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if (rv < 0)
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return rv;
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else if (rv)
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continue;
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rv = check_hotmod_int_op(curr, o, "ipmb", &h->slave_addr);
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if (rv < 0)
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return rv;
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else if (rv)
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continue;
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pr_warn("Invalid hotmod option '%s'\n", curr);
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return -EINVAL;
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}
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h->addr_source = SI_HOTMOD;
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return 0;
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}
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static atomic_t hotmod_nr;
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static int hotmod_handler(const char *val, const struct kernel_param *kp)
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{
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char *str = kstrdup(val, GFP_KERNEL), *curr, *next;
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int rv;
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struct ipmi_plat_data h;
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unsigned int len, ival;
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if (!str)
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return -ENOMEM;
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/* Kill any trailing spaces, as we can get a "\n" from echo. */
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len = strlen(str);
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ival = len - 1;
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while ((ival >= 0) && isspace(str[ival])) {
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str[ival] = '\0';
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ival--;
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}
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for (curr = str; curr; curr = next) {
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enum hotmod_op op;
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next = strchr(curr, ':');
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if (next) {
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*next = '\0';
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next++;
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}
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memset(&h, 0, sizeof(h));
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rv = parse_hotmod_str(curr, &op, &h);
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if (rv)
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goto out;
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if (op == HM_ADD) {
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ipmi_platform_add("hotmod-ipmi-si",
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atomic_inc_return(&hotmod_nr),
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&h);
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} else {
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ipmi_si_remove_by_data(h.space, h.type, h.addr);
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}
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}
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rv = len;
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out:
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kfree(str);
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return rv;
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}
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