OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4

[zen-stable.git] / drivers / edac / edac_core.h

/*
 * Defines, structures, APIs for edac_core module
 *
 * (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>
 *
 */

#ifndef _EDAC_CORE_H_
#define _EDAC_CORE_H_

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/nmi.h>
#include <linux/rcupdate.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/edac.h>

#define EDAC_DEVICE_NAME_LEN    31
#define EDAC_ATTRIB_VALUE_LEN   15

#if PAGE_SHIFT < 20
#define PAGES_TO_MiB(pages)     ((pages) >> (20 - PAGE_SHIFT))
#define MiB_TO_PAGES(mb)        ((mb) << (20 - PAGE_SHIFT))
#else                           /* PAGE_SHIFT > 20 */
#define PAGES_TO_MiB(pages)     ((pages) << (PAGE_SHIFT - 20))
#define MiB_TO_PAGES(mb)        ((mb) >> (PAGE_SHIFT - 20))
#endif

#define edac_printk(level, prefix, fmt, arg...) \
        printk(level "EDAC " prefix ": " fmt, ##arg)

#define edac_mc_printk(mci, level, fmt, arg...) \
        printk(level "EDAC MC%d: " fmt, mci->mc_idx, ##arg)

#define edac_mc_chipset_printk(mci, level, prefix, fmt, arg...) \
        printk(level "EDAC " prefix " MC%d: " fmt, mci->mc_idx, ##arg)

#define edac_device_printk(ctl, level, fmt, arg...) \
        printk(level "EDAC DEVICE%d: " fmt, ctl->dev_idx, ##arg)

#define edac_pci_printk(ctl, level, fmt, arg...) \
        printk(level "EDAC PCI%d: " fmt, ctl->pci_idx, ##arg)

/* prefixes for edac_printk() and edac_mc_printk() */
#define EDAC_MC "MC"
#define EDAC_PCI "PCI"
#define EDAC_DEBUG "DEBUG"

extern const char *edac_mem_types[];

#ifdef CONFIG_EDAC_DEBUG
extern int edac_debug_level;

#define edac_debug_printk(level, fmt, arg...)                           \
        do {                                                            \
                if (level <= edac_debug_level)                          \
                        edac_printk(KERN_DEBUG, EDAC_DEBUG,             \
                                    "%s: " fmt, __func__, ##arg);       \
        } while (0)

#define debugf0( ... ) edac_debug_printk(0, __VA_ARGS__ )
#define debugf1( ... ) edac_debug_printk(1, __VA_ARGS__ )
#define debugf2( ... ) edac_debug_printk(2, __VA_ARGS__ )
#define debugf3( ... ) edac_debug_printk(3, __VA_ARGS__ )
#define debugf4( ... ) edac_debug_printk(4, __VA_ARGS__ )

#else                           /* !CONFIG_EDAC_DEBUG */

#define debugf0( ... )
#define debugf1( ... )
#define debugf2( ... )
#define debugf3( ... )
#define debugf4( ... )

#endif                          /* !CONFIG_EDAC_DEBUG */

#define PCI_VEND_DEV(vend, dev) PCI_VENDOR_ID_ ## vend, \
        PCI_DEVICE_ID_ ## vend ## _ ## dev

#define edac_dev_name(dev) (dev)->dev_name

/*
 * 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 swithces
 * 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 hiearchry. 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);

#ifdef CONFIG_PCI

struct edac_pci_counter {
        atomic_t pe_count;
        atomic_t npe_count;
};

/*
 * Abstract edac_pci control info structure
 *
 */
struct edac_pci_ctl_info {
        /* for global list of edac_pci_ctl_info structs */
        struct list_head link;

        int pci_idx;

        struct bus_type *edac_subsys;   /* pointer to subsystem */

        /* 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_pci_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_pci load start time (jiffies) */

        struct completion complete;

        /* sysfs top name under 'edac' directory
         * and instance name:
         *      cpu/cpu0/...
         *      cpu/cpu1/...
         *      cpu/cpu2/...
         *      ...
         */
        char name[EDAC_DEVICE_NAME_LEN + 1];

        /* Event counters for the this whole EDAC Device */
        struct edac_pci_counter counters;

        /* edac sysfs device control for the 'name'
         * device this structure controls
         */
        struct kobject kobj;
        struct completion kobj_complete;
};

#define to_edac_pci_ctl_work(w) \
                container_of(w, struct edac_pci_ctl_info,work)

/* write all or some bits in a byte-register*/
static inline void pci_write_bits8(struct pci_dev *pdev, int offset, u8 value,
                                   u8 mask)
{
        if (mask != 0xff) {
                u8 buf;

                pci_read_config_byte(pdev, offset, &buf);
                value &= mask;
                buf &= ~mask;
                value |= buf;
        }

        pci_write_config_byte(pdev, offset, value);
}

/* write all or some bits in a word-register*/
static inline void pci_write_bits16(struct pci_dev *pdev, int offset,
                                    u16 value, u16 mask)
{
        if (mask != 0xffff) {
                u16 buf;

                pci_read_config_word(pdev, offset, &buf);
                value &= mask;
                buf &= ~mask;
                value |= buf;
        }

        pci_write_config_word(pdev, offset, value);
}

/*
 * pci_write_bits32
 *
 * edac local routine to do pci_write_config_dword, but adds
 * a mask parameter. If mask is all ones, ignore the mask.
 * Otherwise utilize the mask to isolate specified bits
 *
 * write all or some bits in a dword-register
 */
static inline void pci_write_bits32(struct pci_dev *pdev, int offset,
                                    u32 value, u32 mask)
{
        if (mask != 0xffffffff) {
                u32 buf;

                pci_read_config_dword(pdev, offset, &buf);
                value &= mask;
                buf &= ~mask;
                value |= buf;
        }

        pci_write_config_dword(pdev, offset, value);
}

#endif                          /* CONFIG_PCI */

extern struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
                                          unsigned nr_chans, int edac_index);
extern int edac_mc_add_mc(struct mem_ctl_info *mci);
extern void edac_mc_free(struct mem_ctl_info *mci);
extern struct mem_ctl_info *edac_mc_find(int idx);
extern struct mem_ctl_info *find_mci_by_dev(struct device *dev);
extern struct mem_ctl_info *edac_mc_del_mc(struct device *dev);
extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci,
                                      unsigned long page);

/*
 * The no info errors are used when error overflows are reported.
 * There are a limited number of error logging registers that can
 * be exausted.  When all registers are exhausted and an additional
 * error occurs then an error overflow register records that an
 * error occurred and the type of error, but doesn't have any
 * further information.  The ce/ue versions make for cleaner
 * reporting logic and function interface - reduces conditional
 * statement clutter and extra function arguments.
 */
extern void edac_mc_handle_ce(struct mem_ctl_info *mci,
                              unsigned long page_frame_number,
                              unsigned long offset_in_page,
                              unsigned long syndrome, int row, int channel,
                              const char *msg);
extern void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci,
                                      const char *msg);
extern void edac_mc_handle_ue(struct mem_ctl_info *mci,
                              unsigned long page_frame_number,
                              unsigned long offset_in_page, int row,
                              const char *msg);
extern void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci,
                                      const char *msg);
extern void edac_mc_handle_fbd_ue(struct mem_ctl_info *mci, unsigned int csrow,
                                  unsigned int channel0, unsigned int channel1,
                                  char *msg);
extern void edac_mc_handle_fbd_ce(struct mem_ctl_info *mci, unsigned int csrow,
                                  unsigned int channel, char *msg);

/*
 * edac_device APIs
 */
extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
                                int inst_nr, int block_nr, const char *msg);
extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
                                int inst_nr, int block_nr, const char *msg);
extern int edac_device_alloc_index(void);

/*
 * edac_pci APIs
 */
extern struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt,
                                const char *edac_pci_name);

extern void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci);

extern void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci,
                                unsigned long value);

extern int edac_pci_alloc_index(void);
extern int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx);
extern struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev);

extern struct edac_pci_ctl_info *edac_pci_create_generic_ctl(
                                struct device *dev,
                                const char *mod_name);

extern void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci);
extern int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci);
extern void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci);

/*
 * edac misc APIs
 */
extern char *edac_op_state_to_string(int op_state);

#endif                          /* _EDAC_CORE_H_ */