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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c3052594c8
Provide a new lock type acpi_raw_spinlock which is implemented as raw_spinlock_t on Linux. This type should be used in code which covers small areas of code and disables interrupts only for short time even on a realtime OS. There is a fallback to spinlock_t if an OS does not provide an implementation for acpi_raw_spinlock. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
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/******************************************************************************
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*
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* Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#ifndef __ACLINUXEX_H__
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#define __ACLINUXEX_H__
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#ifdef __KERNEL__
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#ifndef ACPI_USE_NATIVE_DIVIDE
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#ifndef ACPI_DIV_64_BY_32
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#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
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do { \
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u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
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(r32) = do_div ((__n), (d32)); \
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(q32) = (u32) (__n); \
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} while (0)
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#endif
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#ifndef ACPI_SHIFT_RIGHT_64
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#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
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do { \
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(n_lo) >>= 1; \
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(n_lo) |= (((n_hi) & 1) << 31); \
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(n_hi) >>= 1; \
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} while (0)
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#endif
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#endif
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/*
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* Overrides for in-kernel ACPICA
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*/
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acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void);
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acpi_status acpi_os_terminate(void);
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/*
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* The irqs_disabled() check is for resume from RAM.
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* Interrupts are off during resume, just like they are for boot.
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* However, boot has (system_state != SYSTEM_RUNNING)
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* to quiet __might_sleep() in kmalloc() and resume does not.
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*/
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static inline void *acpi_os_allocate(acpi_size size)
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{
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return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
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}
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static inline void *acpi_os_allocate_zeroed(acpi_size size)
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{
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return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
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}
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static inline void acpi_os_free(void *memory)
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{
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kfree(memory);
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}
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static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
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{
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return kmem_cache_zalloc(cache,
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irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
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}
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static inline acpi_thread_id acpi_os_get_thread_id(void)
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{
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return (acpi_thread_id) (unsigned long)current;
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}
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/*
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* When lockdep is enabled, the spin_lock_init() macro stringifies it's
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* argument and uses that as a name for the lock in debugging.
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* By executing spin_lock_init() in a macro the key changes from "lock" for
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* all locks to the name of the argument of acpi_os_create_lock(), which
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* prevents lockdep from reporting false positives for ACPICA locks.
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*/
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#define acpi_os_create_lock(__handle) \
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({ \
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spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
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if (lock) { \
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*(__handle) = lock; \
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spin_lock_init(*(__handle)); \
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} \
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lock ? AE_OK : AE_NO_MEMORY; \
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})
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#define acpi_os_create_raw_lock(__handle) \
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({ \
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raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
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if (lock) { \
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*(__handle) = lock; \
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raw_spin_lock_init(*(__handle)); \
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} \
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lock ? AE_OK : AE_NO_MEMORY; \
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})
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static inline acpi_cpu_flags acpi_os_acquire_raw_lock(acpi_raw_spinlock lockp)
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{
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acpi_cpu_flags flags;
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raw_spin_lock_irqsave(lockp, flags);
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return flags;
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}
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static inline void acpi_os_release_raw_lock(acpi_raw_spinlock lockp,
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acpi_cpu_flags flags)
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{
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raw_spin_unlock_irqrestore(lockp, flags);
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}
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static inline void acpi_os_delete_raw_lock(acpi_raw_spinlock handle)
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{
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ACPI_FREE(handle);
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}
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static inline u8 acpi_os_readable(void *pointer, acpi_size length)
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{
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return TRUE;
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}
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static inline acpi_status acpi_os_initialize_debugger(void)
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{
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return AE_OK;
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}
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static inline void acpi_os_terminate_debugger(void)
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{
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return;
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}
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/*
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* OSL interfaces added by Linux
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*/
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#endif /* __KERNEL__ */
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#endif /* __ACLINUXEX_H__ */
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