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Merge series "Use raw spinlocks in the ls-extirq driver" from Vladimir Oltean <vladimir.oltean@nxp.com>:

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The ls-extirq irqchip driver accesses regmap inside its implementation
of the struct irq_chip :: irq_set_type method, and currently regmap
only knows to lock using normal spinlocks. But the method above wants
raw spinlock context, so this isn't going to work and triggers a
"[ BUG: Invalid wait context ]" splat.

The best we can do given the arrangement of the code is to patch regmap
and the syscon driver: regmap to support raw spinlocks, and syscon to
request them on behalf of its ls-extirq consumer.

Link: https://lore.kernel.org/lkml/20210825135438.ubcuxm5vctt6ne2q@skbuf/T/#u

Vladimir Oltean (2):
  regmap: teach regmap to use raw spinlocks if requested in the config
  mfd: syscon: request a regmap with raw spinlocks for some devices

 drivers/base/regmap/internal.h |  4 ++++
 drivers/base/regmap/regmap.c   | 35 +++++++++++++++++++++++++++++-----
 drivers/mfd/syscon.c           | 16 ++++++++++++++++
 include/linux/regmap.h         |  2 ++
 4 files changed, 52 insertions(+), 5 deletions(-)

--
2.25.1

base-commit: 6efb943b86
This commit is contained in:
Mark Brown 2021-08-26 13:40:35 +01:00
commit d287801c49
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 36 additions and 5 deletions
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4
drivers/base/regmap/internal.h
View File

@ -53,6 +53,10 @@ struct regmap {
spinlock_t spinlock;
unsigned long spinlock_flags;
};
struct {
raw_spinlock_t raw_spinlock;
unsigned long raw_spinlock_flags;
};
};
regmap_lock lock;
regmap_unlock unlock;

35
drivers/base/regmap/regmap.c
View File

@ -533,6 +533,23 @@ __releases(&map->spinlock)
spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
}
static void regmap_lock_raw_spinlock(void *__map)
__acquires(&map->raw_spinlock)
{
struct regmap *map = __map;
unsigned long flags;
raw_spin_lock_irqsave(&map->raw_spinlock, flags);
map->raw_spinlock_flags = flags;
}
static void regmap_unlock_raw_spinlock(void *__map)
__releases(&map->raw_spinlock)
{
struct regmap *map = __map;
raw_spin_unlock_irqrestore(&map->raw_spinlock, map->raw_spinlock_flags);
}
static void dev_get_regmap_release(struct device *dev, void *res)
{
/*
@ -770,11 +787,19 @@ struct regmap *__regmap_init(struct device *dev,
} else {
if ((bus && bus->fast_io) ||
config->fast_io) {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
lockdep_set_class_and_name(&map->spinlock,
lock_key, lock_name);
if (config->use_raw_spinlock) {
raw_spin_lock_init(&map->raw_spinlock);
map->lock = regmap_lock_raw_spinlock;
map->unlock = regmap_unlock_raw_spinlock;
lockdep_set_class_and_name(&map->raw_spinlock,
lock_key, lock_name);
} else {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
lockdep_set_class_and_name(&map->spinlock,
lock_key, lock_name);
}
} else {
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;

2
include/linux/regmap.h
View File

@ -344,6 +344,7 @@ typedef void (*regmap_unlock)(void *);
* @ranges: Array of configuration entries for virtual address ranges.
* @num_ranges: Number of range configuration entries.
* @use_hwlock: Indicate if a hardware spinlock should be used.
* @use_raw_spinlock: Indicate if a raw spinlock should be used.
* @hwlock_id: Specify the hardware spinlock id.
* @hwlock_mode: The hardware spinlock mode, should be HWLOCK_IRQSTATE,
* HWLOCK_IRQ or 0.
@ -403,6 +404,7 @@ struct regmap_config {
unsigned int num_ranges;
bool use_hwlock;
bool use_raw_spinlock;
unsigned int hwlock_id;
unsigned int hwlock_mode;