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67021f25d9
Some drivers might access regmap in a context where a raw spinlock is held. An example is drivers/irqchip/irq-ls-extirq.c, which calls regmap_update_bits() from struct irq_chip :: irq_set_type, which is a method called by __irq_set_trigger() under the desc->lock raw spin lock. Since desc->lock is a raw spin lock and the regmap internal lock for mmio is a plain spinlock (which can become sleepable on RT), this is an invalid locking scheme and we get a splat stating that this is a "[ BUG: Invalid wait context ]". It seems reasonable for regmap to have an option use a raw spinlock too, so add that in the config such that drivers can request it. Suggested-by: Mark Brown <broonie@kernel.org> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20210825205041.927788-2-vladimir.oltean@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
304 lines
8.3 KiB
C
304 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#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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struct {
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raw_spinlock_t raw_spinlock;
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unsigned long raw_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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bool (*writeable_noinc_reg)(struct device *dev, unsigned int reg);
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bool (*readable_noinc_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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const struct regmap_access_table *wr_noinc_table;
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const struct regmap_access_table *rd_noinc_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 write to single write */
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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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/* if set, the regmap core can sleep */
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bool can_sleep;
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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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bool regmap_writeable_noinc(struct regmap *map, unsigned int reg);
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bool regmap_readable_noinc(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);
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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) { }
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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, bool noinc);
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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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