72465736ad
The recently added support for disabling the regmap internal locking left debugfs enabled for devices with the locking disabled. This is a problem since debugfs allows userspace to do things like initiate reads from the hardware which will use the scratch buffers protected by the regmap locking so could cause data corruption. For safety address this by just disabling debugfs for these devices. That is overly conservative since some of the debugfs files just read internal data structures but it's much simpler to implmement and less likely to lead to problems with tooling that works with debugfs. Reported-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
295 lines
8 KiB
C
295 lines
8 KiB
C
/*
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* Register map access API internal header
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _REGMAP_INTERNAL_H
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#define _REGMAP_INTERNAL_H
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#include <linux/device.h>
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#include <linux/regmap.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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struct regmap;
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struct regcache_ops;
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struct regmap_debugfs_off_cache {
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struct list_head list;
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off_t min;
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off_t max;
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unsigned int base_reg;
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unsigned int max_reg;
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};
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struct regmap_format {
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size_t buf_size;
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size_t reg_bytes;
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size_t pad_bytes;
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size_t val_bytes;
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void (*format_write)(struct regmap *map,
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unsigned int reg, unsigned int val);
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void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
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void (*format_val)(void *buf, unsigned int val, unsigned int shift);
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unsigned int (*parse_val)(const void *buf);
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void (*parse_inplace)(void *buf);
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};
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struct regmap_async {
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struct list_head list;
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struct regmap *map;
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void *work_buf;
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};
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struct regmap {
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union {
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struct mutex mutex;
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struct {
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spinlock_t spinlock;
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unsigned long spinlock_flags;
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};
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};
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regmap_lock lock;
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regmap_unlock unlock;
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void *lock_arg; /* This is passed to lock/unlock functions */
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gfp_t alloc_flags;
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struct device *dev; /* Device we do I/O on */
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void *work_buf; /* Scratch buffer used to format I/O */
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struct regmap_format format; /* Buffer format */
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const struct regmap_bus *bus;
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void *bus_context;
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const char *name;
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bool async;
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spinlock_t async_lock;
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wait_queue_head_t async_waitq;
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struct list_head async_list;
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struct list_head async_free;
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int async_ret;
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#ifdef CONFIG_DEBUG_FS
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bool debugfs_disable;
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struct dentry *debugfs;
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const char *debugfs_name;
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unsigned int debugfs_reg_len;
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unsigned int debugfs_val_len;
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unsigned int debugfs_tot_len;
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struct list_head debugfs_off_cache;
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struct mutex cache_lock;
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#endif
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unsigned int max_register;
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bool (*writeable_reg)(struct device *dev, unsigned int reg);
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bool (*readable_reg)(struct device *dev, unsigned int reg);
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bool (*volatile_reg)(struct device *dev, unsigned int reg);
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bool (*precious_reg)(struct device *dev, unsigned int reg);
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const struct regmap_access_table *wr_table;
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const struct regmap_access_table *rd_table;
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const struct regmap_access_table *volatile_table;
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const struct regmap_access_table *precious_table;
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int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
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int (*reg_write)(void *context, unsigned int reg, unsigned int val);
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int (*reg_update_bits)(void *context, unsigned int reg,
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unsigned int mask, unsigned int val);
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bool defer_caching;
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unsigned long read_flag_mask;
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unsigned long write_flag_mask;
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/* number of bits to (left) shift the reg value when formatting*/
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int reg_shift;
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int reg_stride;
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int reg_stride_order;
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/* regcache specific members */
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const struct regcache_ops *cache_ops;
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enum regcache_type cache_type;
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/* number of bytes in reg_defaults_raw */
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unsigned int cache_size_raw;
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/* number of bytes per word in reg_defaults_raw */
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unsigned int cache_word_size;
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/* number of entries in reg_defaults */
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unsigned int num_reg_defaults;
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/* number of entries in reg_defaults_raw */
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unsigned int num_reg_defaults_raw;
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/* if set, only the cache is modified not the HW */
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bool cache_only;
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/* if set, only the HW is modified not the cache */
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bool cache_bypass;
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/* if set, remember to free reg_defaults_raw */
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bool cache_free;
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struct reg_default *reg_defaults;
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const void *reg_defaults_raw;
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void *cache;
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/* if set, the cache contains newer data than the HW */
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bool cache_dirty;
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/* if set, the HW registers are known to match map->reg_defaults */
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bool no_sync_defaults;
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struct reg_sequence *patch;
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int patch_regs;
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/* if set, converts bulk read to single read */
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bool use_single_read;
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/* if set, converts bulk read to single read */
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bool use_single_write;
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/* if set, the device supports multi write mode */
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bool can_multi_write;
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/* if set, raw reads/writes are limited to this size */
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size_t max_raw_read;
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size_t max_raw_write;
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struct rb_root range_tree;
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void *selector_work_buf; /* Scratch buffer used for selector */
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struct hwspinlock *hwlock;
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};
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struct regcache_ops {
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const char *name;
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enum regcache_type type;
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int (*init)(struct regmap *map);
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int (*exit)(struct regmap *map);
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#ifdef CONFIG_DEBUG_FS
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void (*debugfs_init)(struct regmap *map);
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#endif
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int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
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int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
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int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
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int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
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};
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bool regmap_cached(struct regmap *map, unsigned int reg);
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bool regmap_writeable(struct regmap *map, unsigned int reg);
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bool regmap_readable(struct regmap *map, unsigned int reg);
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bool regmap_volatile(struct regmap *map, unsigned int reg);
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bool regmap_precious(struct regmap *map, unsigned int reg);
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int _regmap_write(struct regmap *map, unsigned int reg,
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unsigned int val);
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struct regmap_range_node {
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struct rb_node node;
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const char *name;
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struct regmap *map;
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unsigned int range_min;
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unsigned int range_max;
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unsigned int selector_reg;
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unsigned int selector_mask;
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int selector_shift;
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unsigned int window_start;
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unsigned int window_len;
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};
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struct regmap_field {
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struct regmap *regmap;
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unsigned int mask;
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/* lsb */
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unsigned int shift;
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unsigned int reg;
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unsigned int id_size;
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unsigned int id_offset;
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};
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#ifdef CONFIG_DEBUG_FS
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extern void regmap_debugfs_initcall(void);
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extern void regmap_debugfs_init(struct regmap *map, const char *name);
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extern void regmap_debugfs_exit(struct regmap *map);
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static inline void regmap_debugfs_disable(struct regmap *map)
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{
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map->debugfs_disable = true;
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}
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#else
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static inline void regmap_debugfs_initcall(void) { }
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static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
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static inline void regmap_debugfs_exit(struct regmap *map) { }
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static inline void regmap_debugfs_disable(struct regmap *map) { }
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#endif
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/* regcache core declarations */
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int regcache_init(struct regmap *map, const struct regmap_config *config);
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void regcache_exit(struct regmap *map);
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int regcache_read(struct regmap *map,
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unsigned int reg, unsigned int *value);
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int regcache_write(struct regmap *map,
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unsigned int reg, unsigned int value);
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int regcache_sync(struct regmap *map);
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int regcache_sync_block(struct regmap *map, void *block,
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unsigned long *cache_present,
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unsigned int block_base, unsigned int start,
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unsigned int end);
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static inline const void *regcache_get_val_addr(struct regmap *map,
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const void *base,
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unsigned int idx)
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{
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return base + (map->cache_word_size * idx);
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}
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unsigned int regcache_get_val(struct regmap *map, const void *base,
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unsigned int idx);
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bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
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unsigned int val);
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int regcache_lookup_reg(struct regmap *map, unsigned int reg);
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int _regmap_raw_write(struct regmap *map, unsigned int reg,
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const void *val, size_t val_len);
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void regmap_async_complete_cb(struct regmap_async *async, int ret);
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enum regmap_endian regmap_get_val_endian(struct device *dev,
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const struct regmap_bus *bus,
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const struct regmap_config *config);
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extern struct regcache_ops regcache_rbtree_ops;
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extern struct regcache_ops regcache_lzo_ops;
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extern struct regcache_ops regcache_flat_ops;
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static inline const char *regmap_name(const struct regmap *map)
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{
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if (map->dev)
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return dev_name(map->dev);
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return map->name;
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}
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static inline unsigned int regmap_get_offset(const struct regmap *map,
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unsigned int index)
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{
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if (map->reg_stride_order >= 0)
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return index << map->reg_stride_order;
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else
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return index * map->reg_stride;
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}
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static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
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unsigned int reg)
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{
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return reg >> map->reg_stride_order;
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}
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#endif
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