/*
* Defines, structures, APIs for edac_device
*
* (C) 2007 Linux Networx (http://lnxi.com)
* This file may be distributed under the terms of the
* GNU General Public License.
*
* Written by Thayne Harbaugh
* Based on work by Dan Hollis <goemon at anime dot net> and others.
* http://www.anime.net/~goemon/linux-ecc/
*
* NMI handling support added by
* Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>
*
* Refactored for multi-source files:
* Doug Thompson <norsk5@xmission.com>
*
* Please look at Documentation/driver-api/edac.rst for more info about
* EDAC core structs and functions.
*/
#ifndef _EDAC_DEVICE_H_
#define _EDAC_DEVICE_H_
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/edac.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
/*
* The following are the structures to provide for a generic
* or abstract 'edac_device'. This set of structures and the
* code that implements the APIs for the same, provide for
* registering EDAC type devices which are NOT standard memory.
*
* CPU caches (L1 and L2)
* DMA engines
* Core CPU switches
* Fabric switch units
* PCIe interface controllers
* other EDAC/ECC type devices that can be monitored for
* errors, etc.
*
* It allows for a 2 level set of hierarchy. For example:
*
* cache could be composed of L1, L2 and L3 levels of cache.
* Each CPU core would have its own L1 cache, while sharing
* L2 and maybe L3 caches.
*
* View them arranged, via the sysfs presentation:
* /sys/devices/system/edac/..
*
* mc/ <existing memory device directory>
* cpu/cpu0/.. <L1 and L2 block directory>
* /L1-cache/ce_count
* /ue_count
* /L2-cache/ce_count
* /ue_count
* cpu/cpu1/.. <L1 and L2 block directory>
* /L1-cache/ce_count
* /ue_count
* /L2-cache/ce_count
* /ue_count
* ...
*
* the L1 and L2 directories would be "edac_device_block's"
*/
struct edac_device_counter {
u32 ue_count;
u32 ce_count;
};
/* forward reference */
struct edac_device_ctl_info;
struct edac_device_block;
/* edac_dev_sysfs_attribute structure
* used for driver sysfs attributes in mem_ctl_info
* for extra controls and attributes:
* like high level error Injection controls
*/
struct edac_dev_sysfs_attribute {
struct attribute attr;
ssize_t (*show)(struct edac_device_ctl_info *, char *);
ssize_t (*store)(struct edac_device_ctl_info *, const char *, size_t);
};
/* edac_dev_sysfs_block_attribute structure
*
* used in leaf 'block' nodes for adding controls/attributes
*
* each block in each instance of the containing control structure
* can have an array of the following. The show and store functions
* will be filled in with the show/store function in the
* low level driver.
*
* The 'value' field will be the actual value field used for
* counting
*/
struct edac_dev_sysfs_block_attribute {
struct attribute attr;
ssize_t (*show)(struct kobject *, struct attribute *, char *);
ssize_t (*store)(struct kobject *, struct attribute *,
const char *, size_t);
struct edac_device_block *block;
unsigned int value;
};
/* device block control structure */
struct edac_device_block {
struct edac_device_instance *instance; /* Up Pointer */
char name[EDAC_DEVICE_NAME_LEN + 1];
struct edac_device_counter counters; /* basic UE and CE counters */
int nr_attribs; /* how many attributes */
/* this block's attributes, could be NULL */
struct edac_dev_sysfs_block_attribute *block_attributes;
/* edac sysfs device control */
struct kobject kobj;
};
/* device instance control structure */
struct edac_device_instance {
struct edac_device_ctl_info *ctl; /* Up pointer */
char name[EDAC_DEVICE_NAME_LEN + 4];
struct edac_device_counter counters; /* instance counters */
u32 nr_blocks; /* how many blocks */
struct edac_device_block *blocks; /* block array */
/* edac sysfs device control */
struct kobject kobj;
};
/*
* Abstract edac_device control info structure
*
*/
struct edac_device_ctl_info {
/* for global list of edac_device_ctl_info structs */
struct list_head link;
struct module *owner; /* Module owner of this control struct */
int dev_idx;
/* Per instance controls for this edac_device */
int log_ue; /* boolean for logging UEs */
int log_ce; /* boolean for logging CEs */
int panic_on_ue; /* boolean for panic'ing on an UE */
unsigned poll_msec; /* number of milliseconds to poll interval */
unsigned long delay; /* number of jiffies for poll_msec */
/* Additional top controller level attributes, but specified
* by the low level driver.
*
* Set by the low level driver to provide attributes at the
* controller level, same level as 'ue_count' and 'ce_count' above.
* An array of structures, NULL terminated
*
* If attributes are desired, then set to array of attributes
* If no attributes are desired, leave NULL
*/
struct edac_dev_sysfs_attribute *sysfs_attributes;
/* pointer to main 'edac' subsys in sysfs */
struct bus_type *edac_subsys;
/* the internal state of this controller instance */
int op_state;
/* work struct for this instance */
struct delayed_work work;
/* pointer to edac polling checking routine:
* If NOT NULL: points to polling check routine
* If NULL: Then assumes INTERRUPT operation, where
* MC driver will receive events
*/
void (*edac_check) (struct edac_device_ctl_info * edac_dev);
struct device *dev; /* pointer to device structure */
const char *mod_name; /* module name */
const char *ctl_name; /* edac controller name */
const char *dev_name; /* pci/platform/etc... name */
void *pvt_info; /* pointer to 'private driver' info */
unsigned long start_time; /* edac_device load start time (jiffies) */
struct completion removal_complete;
/* sysfs top name under 'edac' directory
* and instance name:
* cpu/cpu0/...
* cpu/cpu1/...
* cpu/cpu2/...
* ...
*/
char name[EDAC_DEVICE_NAME_LEN + 1];
/* Number of instances supported on this control structure
* and the array of those instances
*/
u32 nr_instances;
struct edac_device_instance *instances;
/* Event counters for the this whole EDAC Device */
struct edac_device_counter counters;
/* edac sysfs device control for the 'name'
* device this structure controls
*/
struct kobject kobj;
};
/* To get from the instance's wq to the beginning of the ctl structure */
#define to_edac_mem_ctl_work(w) \
container_of(w, struct mem_ctl_info, work)
#define to_edac_device_ctl_work(w) \
container_of(w,struct edac_device_ctl_info,work)
/*
* 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.
*/
extern struct edac_device_ctl_info *edac_device_alloc_ctl_info(
unsigned sizeof_private,
char *edac_device_name, unsigned nr_instances,
char *edac_block_name, unsigned nr_blocks,
unsigned offset_value,
struct edac_dev_sysfs_block_attribute *block_attributes,
unsigned nr_attribs,
int device_index);
/* The offset value can be:
* -1 indicating no offset value
* 0 for zero-based block numbers
* 1 for 1-based block number
* other for other-based block number
*/
#define BLOCK_OFFSET_VALUE_OFF ((unsigned) -1)
extern void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info);
/**
* edac_device_add_device: Insert the 'edac_dev' structure into the
* edac_device global list and create sysfs entries associated with
* edac_device structure.
*
* @edac_dev: pointer to edac_device structure to be added to the list
* 'edac_device' structure.
*
* Returns:
* 0 on Success, or an error code on failure
*/
extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
/**
* edac_device_del_device:
* Remove sysfs entries for specified edac_device structure and
* then remove edac_device structure from global list
*
* @dev:
* Pointer to struct &device representing the edac device
* structure to remove.
*
* Returns:
* Pointer to removed edac_device structure,
* or %NULL if device not found.
*/
extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
/**
* edac_device_handle_ue():
* perform a common output and handling of an 'edac_dev' UE event
*
* @edac_dev: pointer to struct &edac_device_ctl_info
* @inst_nr: number of the instance where the UE error happened
* @block_nr: number of the block where the UE error happened
* @msg: message to be printed
*/
extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
int inst_nr, int block_nr, const char *msg);
/**
* edac_device_handle_ce():
* perform a common output and handling of an 'edac_dev' CE event
*
* @edac_dev: pointer to struct &edac_device_ctl_info
* @inst_nr: number of the instance where the CE error happened
* @block_nr: number of the block where the CE error happened
* @msg: message to be printed
*/
extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
int inst_nr, int block_nr, const char *msg);
/**
* edac_device_alloc_index: Allocate a unique device index number
*
* Returns:
* allocated index number
*/
extern int edac_device_alloc_index(void);
extern const char *edac_layer_name[];
#endif
