diff options
Diffstat (limited to 'drivers/net/netconsole.c')
| -rw-r--r-- | drivers/net/netconsole.c | 155 |
1 files changed, 102 insertions, 53 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 3111e1648592..6e14ba5e06c8 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -53,6 +53,8 @@ static bool oops_only = false; module_param(oops_only, bool, 0600); MODULE_PARM_DESC(oops_only, "Only log oops messages"); +#define NETCONSOLE_PARAM_TARGET_PREFIX "cmdline" + #ifndef MODULE static int __init option_setup(char *opt) { @@ -165,6 +167,10 @@ static void netconsole_target_put(struct netconsole_target *nt) { } +static void populate_configfs_item(struct netconsole_target *nt, + int cmdline_count) +{ +} #endif /* CONFIG_NETCONSOLE_DYNAMIC */ /* Allocate and initialize with defaults. @@ -192,58 +198,6 @@ static struct netconsole_target *alloc_and_init(void) return nt; } -/* Allocate new target (from boot/module param) and setup netpoll for it */ -static struct netconsole_target *alloc_param_target(char *target_config) -{ - struct netconsole_target *nt; - int err; - - nt = alloc_and_init(); - if (!nt) { - err = -ENOMEM; - goto fail; - } - - if (*target_config == '+') { - nt->extended = true; - target_config++; - } - - if (*target_config == 'r') { - if (!nt->extended) { - pr_err("Netconsole configuration error. Release feature requires extended log message"); - err = -EINVAL; - goto fail; - } - nt->release = true; - target_config++; - } - - /* Parse parameters and setup netpoll */ - err = netpoll_parse_options(&nt->np, target_config); - if (err) - goto fail; - - err = netpoll_setup(&nt->np); - if (err) - goto fail; - - nt->enabled = true; - - return nt; - -fail: - kfree(nt); - return ERR_PTR(err); -} - -/* Cleanup netpoll for given target (from boot/module param) and free it */ -static void free_param_target(struct netconsole_target *nt) -{ - netpoll_cleanup(&nt->np); - kfree(nt); -} - #ifdef CONFIG_NETCONSOLE_DYNAMIC /* @@ -675,6 +629,23 @@ static const struct config_item_type netconsole_target_type = { .ct_owner = THIS_MODULE, }; +static struct netconsole_target *find_cmdline_target(const char *name) +{ + struct netconsole_target *nt, *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&target_list_lock, flags); + list_for_each_entry(nt, &target_list, list) { + if (!strcmp(nt->item.ci_name, name)) { + ret = nt; + break; + } + } + spin_unlock_irqrestore(&target_list_lock, flags); + + return ret; +} + /* * Group operations and type for netconsole_subsys. */ @@ -685,6 +656,17 @@ static struct config_item *make_netconsole_target(struct config_group *group, struct netconsole_target *nt; unsigned long flags; + /* Checking if a target by this name was created at boot time. If so, + * attach a configfs entry to that target. This enables dynamic + * control. + */ + if (!strncmp(name, NETCONSOLE_PARAM_TARGET_PREFIX, + strlen(NETCONSOLE_PARAM_TARGET_PREFIX))) { + nt = find_cmdline_target(name); + if (nt) + return &nt->item; + } + nt = alloc_and_init(); if (!nt) return ERR_PTR(-ENOMEM); @@ -740,6 +722,17 @@ static struct configfs_subsystem netconsole_subsys = { }, }; +static void populate_configfs_item(struct netconsole_target *nt, + int cmdline_count) +{ + char target_name[16]; + + snprintf(target_name, sizeof(target_name), "%s%d", + NETCONSOLE_PARAM_TARGET_PREFIX, cmdline_count); + config_item_init_type_name(&nt->item, target_name, + &netconsole_target_type); +} + #endif /* CONFIG_NETCONSOLE_DYNAMIC */ /* Handle network interface device notifications */ @@ -938,6 +931,60 @@ static void write_msg(struct console *con, const char *msg, unsigned int len) spin_unlock_irqrestore(&target_list_lock, flags); } +/* Allocate new target (from boot/module param) and setup netpoll for it */ +static struct netconsole_target *alloc_param_target(char *target_config, + int cmdline_count) +{ + struct netconsole_target *nt; + int err; + + nt = alloc_and_init(); + if (!nt) { + err = -ENOMEM; + goto fail; + } + + if (*target_config == '+') { + nt->extended = true; + target_config++; + } + + if (*target_config == 'r') { + if (!nt->extended) { + pr_err("Netconsole configuration error. Release feature requires extended log message"); + err = -EINVAL; + goto fail; + } + nt->release = true; + target_config++; + } + + /* Parse parameters and setup netpoll */ + err = netpoll_parse_options(&nt->np, target_config); + if (err) + goto fail; + + err = netpoll_setup(&nt->np); + if (err) + goto fail; + + populate_configfs_item(nt, cmdline_count); + nt->enabled = true; + + return nt; + +fail: + kfree(nt); + return ERR_PTR(err); +} + +/* Cleanup netpoll for given target (from boot/module param) and free it */ +static void free_param_target(struct netconsole_target *nt) +{ + netpoll_cleanup(&nt->np); + kfree(nt); +} + static struct console netconsole_ext = { .name = "netcon_ext", .flags = CON_ENABLED | CON_EXTENDED, @@ -954,6 +1001,7 @@ static int __init init_netconsole(void) { int err; struct netconsole_target *nt, *tmp; + unsigned int count = 0; bool extended = false; unsigned long flags; char *target_config; @@ -961,7 +1009,7 @@ static int __init init_netconsole(void) if (strnlen(input, MAX_PARAM_LENGTH)) { while ((target_config = strsep(&input, ";"))) { - nt = alloc_param_target(target_config); + nt = alloc_param_target(target_config, count); if (IS_ERR(nt)) { err = PTR_ERR(nt); goto fail; @@ -977,6 +1025,7 @@ static int __init init_netconsole(void) spin_lock_irqsave(&target_list_lock, flags); list_add(&nt->list, &target_list); spin_unlock_irqrestore(&target_list_lock, flags); + count++; } } |