diff options
Diffstat (limited to 'drivers/edac/edac_device.c')
| -rw-r--r-- | drivers/edac/edac_device.c | 105 |
1 files changed, 54 insertions, 51 deletions
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index 258e146efcbd..3ccadda3e723 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -20,6 +20,7 @@ #include <linux/highmem.h> #include <linux/timer.h> #include <linux/slab.h> +#include <linux/jiffies.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/sysdev.h> @@ -31,20 +32,10 @@ #include "edac_core.h" #include "edac_module.h" -/* lock to memory controller's control array */ +/* lock to memory controller's control array 'edac_device_list' */ static DECLARE_MUTEX(device_ctls_mutex); static struct list_head edac_device_list = LIST_HEAD_INIT(edac_device_list); -static inline void lock_device_list(void) -{ - down(&device_ctls_mutex); -} - -static inline void unlock_device_list(void) -{ - up(&device_ctls_mutex); -} - #ifdef CONFIG_EDAC_DEBUG static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev) { @@ -58,20 +49,25 @@ static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev) #endif /* CONFIG_EDAC_DEBUG */ /* - * The alloc() and free() functions for the 'edac_device' control info - * structure. A MC driver will allocate one of these for each edac_device - * it is going to control/register with the EDAC CORE. + * edac_device_alloc_ctl_info() + * Allocate a new edac device control info structure + * + * The control structure is allocated in complete chunk + * from the OS. It is in turn sub allocated to the + * various objects that compose the struture + * + * The structure has a 'nr_instance' array within itself. + * Each instance represents a major component + * Example: L1 cache and L2 cache are 2 instance components + * + * Within each instance is an array of 'nr_blocks' blockoffsets */ struct edac_device_ctl_info *edac_device_alloc_ctl_info( unsigned sz_private, - char *edac_device_name, - unsigned nr_instances, - char *edac_block_name, - unsigned nr_blocks, - unsigned offset_value, - struct edac_attrib_spec - *attrib_spec, - unsigned nr_attribs) + char *edac_device_name, unsigned nr_instances, + char *edac_block_name, unsigned nr_blocks, + unsigned offset_value, /* zero, 1, or other based offset */ + struct edac_attrib_spec *attrib_spec, unsigned nr_attribs) { struct edac_device_ctl_info *dev_ctl; struct edac_device_instance *dev_inst, *inst; @@ -90,7 +86,7 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( * to be at least as stringent as what the compiler would * provide if we could simply hardcode everything into a single struct. */ - dev_ctl = (struct edac_device_ctl_info *)0; + dev_ctl = (struct edac_device_ctl_info *)NULL; /* Calc the 'end' offset past the ctl_info structure */ dev_inst = (struct edac_device_instance *) @@ -114,7 +110,8 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( total_size = ((unsigned long)pvt) + sz_private; /* Allocate the amount of memory for the set of control structures */ - if ((dev_ctl = kmalloc(total_size, GFP_KERNEL)) == NULL) + dev_ctl = kzalloc(total_size, GFP_KERNEL); + if (dev_ctl == NULL) return NULL; /* Adjust pointers so they point within the memory we just allocated @@ -128,14 +125,12 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( (((char *)dev_ctl) + ((unsigned long)dev_attrib)); pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL; - memset(dev_ctl, 0, total_size); /* clear all fields */ dev_ctl->nr_instances = nr_instances; dev_ctl->instances = dev_inst; dev_ctl->pvt_info = pvt; - /* Name of this edac device, ensure null terminated */ - snprintf(dev_ctl->name, sizeof(dev_ctl->name), "%s", edac_device_name); - dev_ctl->name[sizeof(dev_ctl->name) - 1] = '\0'; + /* Name of this edac device */ + snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name); /* Initialize every Instance */ for (instance = 0; instance < nr_instances; instance++) { @@ -148,7 +143,6 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( /* name of this instance */ snprintf(inst->name, sizeof(inst->name), "%s%u", edac_device_name, instance); - inst->name[sizeof(inst->name) - 1] = '\0'; /* Initialize every block in each instance */ for (block = 0; block < nr_blocks; block++) { @@ -159,7 +153,6 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( blk->attribs = attrib_p; snprintf(blk->name, sizeof(blk->name), "%s%d", edac_block_name, block+offset_value); - blk->name[sizeof(blk->name) - 1] = '\0'; debugf1("%s() instance=%d block=%d name=%s\n", __func__, instance, block, blk->name); @@ -186,7 +179,6 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info( return dev_ctl; } - EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info); /* @@ -198,12 +190,17 @@ void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info) { kfree(ctl_info); } - EXPORT_SYMBOL_GPL(edac_device_free_ctl_info); /* * find_edac_device_by_dev * scans the edac_device list for a specific 'struct device *' + * + * lock to be held prior to call: device_ctls_mutex + * + * Return: + * pointer to control structure managing 'dev' + * NULL if not found on list */ static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev) { @@ -226,6 +223,9 @@ static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev) * add_edac_dev_to_global_list * Before calling this function, caller must * assign a unique value to edac_dev->dev_idx. + * + * lock to be held prior to call: device_ctls_mutex + * * Return: * 0 on success * 1 on failure. @@ -238,7 +238,8 @@ static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev) insert_before = &edac_device_list; /* Determine if already on the list */ - if (unlikely((rover = find_edac_device_by_dev(edac_dev->dev)) != NULL)) + rover = find_edac_device_by_dev(edac_dev->dev); + if (unlikely(rover != NULL)) goto fail0; /* Insert in ascending order by 'dev_idx', so find position */ @@ -274,6 +275,8 @@ fail1: /* * complete_edac_device_list_del + * + * callback function when reference count is zero */ static void complete_edac_device_list_del(struct rcu_head *head) { @@ -286,6 +289,9 @@ static void complete_edac_device_list_del(struct rcu_head *head) /* * del_edac_device_from_global_list + * + * remove the RCU, setup for a callback call, then wait for the + * callback to occur */ static void del_edac_device_from_global_list(struct edac_device_ctl_info *edac_device) @@ -325,8 +331,7 @@ struct edac_device_ctl_info *edac_device_find(int idx) return NULL; } - -EXPORT_SYMBOL(edac_device_find); +EXPORT_SYMBOL_GPL(edac_device_find); /* * edac_device_workq_function @@ -338,7 +343,7 @@ static void edac_device_workq_function(struct work_struct *work_req) struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work); //debugf0("%s() here and running\n", __func__); - lock_device_list(); + down(&device_ctls_mutex); /* Only poll controllers that are running polled and have a check */ if ((edac_dev->op_state == OP_RUNNING_POLL) && @@ -346,7 +351,7 @@ static void edac_device_workq_function(struct work_struct *work_req) edac_dev->edac_check(edac_dev); } - unlock_device_list(); + up(&device_ctls_mutex); /* Reschedule */ queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay); @@ -363,7 +368,7 @@ void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev, debugf0("%s()\n", __func__); edac_dev->poll_msec = msec; - edac_calc_delay(edac_dev); /* Calc delay jiffies */ + edac_dev->delay = msecs_to_jiffies(msec); /* Calc delay jiffies */ INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function); queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay); @@ -391,7 +396,7 @@ void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev) void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev, unsigned long value) { - lock_device_list(); + down(&device_ctls_mutex); /* cancel the current workq request */ edac_device_workq_teardown(edac_dev); @@ -399,7 +404,7 @@ void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev, /* restart the workq request, with new delay value */ edac_device_workq_setup(edac_dev, value); - unlock_device_list(); + up(&device_ctls_mutex); } /** @@ -423,7 +428,7 @@ int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx) if (edac_debug_level >= 3) edac_device_dump_device(edac_dev); #endif - lock_device_list(); + down(&device_ctls_mutex); if (add_edac_dev_to_global_list(edac_dev)) goto fail0; @@ -461,7 +466,7 @@ int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx) dev_name(edac_dev), edac_op_state_toString(edac_dev->op_state)); - unlock_device_list(); + up(&device_ctls_mutex); return 0; fail1: @@ -469,10 +474,9 @@ fail1: del_edac_device_from_global_list(edac_dev); fail0: - unlock_device_list(); + up(&device_ctls_mutex); return 1; } - EXPORT_SYMBOL_GPL(edac_device_add_device); /** @@ -494,10 +498,12 @@ struct edac_device_ctl_info *edac_device_del_device(struct device *dev) debugf0("MC: %s()\n", __func__); - lock_device_list(); + down(&device_ctls_mutex); - if ((edac_dev = find_edac_device_by_dev(dev)) == NULL) { - unlock_device_list(); + /* Find the structure on the list, if not there, then leave */ + edac_dev = find_edac_device_by_dev(dev); + if (edac_dev == NULL) { + up(&device_ctls_mutex); return NULL; } @@ -513,7 +519,7 @@ struct edac_device_ctl_info *edac_device_del_device(struct device *dev) /* deregister from global list */ del_edac_device_from_global_list(edac_dev); - unlock_device_list(); + up(&device_ctls_mutex); edac_printk(KERN_INFO, EDAC_MC, "Removed device %d for %s %s: DEV %s\n", @@ -522,7 +528,6 @@ struct edac_device_ctl_info *edac_device_del_device(struct device *dev) return edac_dev; } - EXPORT_SYMBOL_GPL(edac_device_del_device); static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev) @@ -585,7 +590,6 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev, edac_dev->ctl_name, instance->name, block ? block->name : "N/A", msg); } - EXPORT_SYMBOL_GPL(edac_device_handle_ce); /* @@ -637,5 +641,4 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, edac_dev->ctl_name, instance->name, block ? block->name : "N/A", msg); } - EXPORT_SYMBOL_GPL(edac_device_handle_ue); |