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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license v2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see https www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000435.923873561@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
592 lines
16 KiB
C
592 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Fast and scalable bitmaps.
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*
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* Copyright (C) 2016 Facebook
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* Copyright (C) 2013-2014 Jens Axboe
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*/
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#ifndef __LINUX_SCALE_BITMAP_H
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#define __LINUX_SCALE_BITMAP_H
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#include <linux/kernel.h>
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#include <linux/slab.h>
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struct seq_file;
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/**
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* struct sbitmap_word - Word in a &struct sbitmap.
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*/
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struct sbitmap_word {
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/**
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* @depth: Number of bits being used in @word/@cleared
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*/
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unsigned long depth;
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/**
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* @word: word holding free bits
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*/
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unsigned long word ____cacheline_aligned_in_smp;
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/**
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* @cleared: word holding cleared bits
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*/
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unsigned long cleared ____cacheline_aligned_in_smp;
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/**
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* @swap_lock: Held while swapping word <-> cleared
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*/
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spinlock_t swap_lock;
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} ____cacheline_aligned_in_smp;
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/**
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* struct sbitmap - Scalable bitmap.
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*
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* A &struct sbitmap is spread over multiple cachelines to avoid ping-pong. This
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* trades off higher memory usage for better scalability.
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*/
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struct sbitmap {
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/**
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* @depth: Number of bits used in the whole bitmap.
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*/
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unsigned int depth;
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/**
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* @shift: log2(number of bits used per word)
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*/
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unsigned int shift;
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/**
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* @map_nr: Number of words (cachelines) being used for the bitmap.
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*/
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unsigned int map_nr;
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/**
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* @map: Allocated bitmap.
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*/
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struct sbitmap_word *map;
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};
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#define SBQ_WAIT_QUEUES 8
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#define SBQ_WAKE_BATCH 8
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/**
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* struct sbq_wait_state - Wait queue in a &struct sbitmap_queue.
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*/
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struct sbq_wait_state {
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/**
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* @wait_cnt: Number of frees remaining before we wake up.
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*/
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atomic_t wait_cnt;
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/**
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* @wait: Wait queue.
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*/
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wait_queue_head_t wait;
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} ____cacheline_aligned_in_smp;
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/**
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* struct sbitmap_queue - Scalable bitmap with the added ability to wait on free
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* bits.
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*
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* A &struct sbitmap_queue uses multiple wait queues and rolling wakeups to
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* avoid contention on the wait queue spinlock. This ensures that we don't hit a
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* scalability wall when we run out of free bits and have to start putting tasks
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* to sleep.
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*/
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struct sbitmap_queue {
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/**
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* @sb: Scalable bitmap.
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*/
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struct sbitmap sb;
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/*
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* @alloc_hint: Cache of last successfully allocated or freed bit.
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*
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* This is per-cpu, which allows multiple users to stick to different
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* cachelines until the map is exhausted.
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*/
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unsigned int __percpu *alloc_hint;
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/**
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* @wake_batch: Number of bits which must be freed before we wake up any
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* waiters.
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*/
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unsigned int wake_batch;
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/**
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* @wake_index: Next wait queue in @ws to wake up.
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*/
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atomic_t wake_index;
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/**
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* @ws: Wait queues.
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*/
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struct sbq_wait_state *ws;
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/*
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* @ws_active: count of currently active ws waitqueues
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*/
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atomic_t ws_active;
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/**
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* @round_robin: Allocate bits in strict round-robin order.
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*/
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bool round_robin;
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/**
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* @min_shallow_depth: The minimum shallow depth which may be passed to
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* sbitmap_queue_get_shallow() or __sbitmap_queue_get_shallow().
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*/
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unsigned int min_shallow_depth;
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};
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/**
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* sbitmap_init_node() - Initialize a &struct sbitmap on a specific memory node.
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* @sb: Bitmap to initialize.
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* @depth: Number of bits to allocate.
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* @shift: Use 2^@shift bits per word in the bitmap; if a negative number if
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* given, a good default is chosen.
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* @flags: Allocation flags.
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* @node: Memory node to allocate on.
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*
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* Return: Zero on success or negative errno on failure.
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*/
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int sbitmap_init_node(struct sbitmap *sb, unsigned int depth, int shift,
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gfp_t flags, int node);
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/**
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* sbitmap_free() - Free memory used by a &struct sbitmap.
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* @sb: Bitmap to free.
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*/
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static inline void sbitmap_free(struct sbitmap *sb)
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{
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kfree(sb->map);
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sb->map = NULL;
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}
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/**
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* sbitmap_resize() - Resize a &struct sbitmap.
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* @sb: Bitmap to resize.
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* @depth: New number of bits to resize to.
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*
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* Doesn't reallocate anything. It's up to the caller to ensure that the new
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* depth doesn't exceed the depth that the sb was initialized with.
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*/
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void sbitmap_resize(struct sbitmap *sb, unsigned int depth);
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/**
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* sbitmap_get() - Try to allocate a free bit from a &struct sbitmap.
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* @sb: Bitmap to allocate from.
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* @alloc_hint: Hint for where to start searching for a free bit.
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* @round_robin: If true, be stricter about allocation order; always allocate
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* starting from the last allocated bit. This is less efficient
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* than the default behavior (false).
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*
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* This operation provides acquire barrier semantics if it succeeds.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int sbitmap_get(struct sbitmap *sb, unsigned int alloc_hint, bool round_robin);
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/**
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* sbitmap_get_shallow() - Try to allocate a free bit from a &struct sbitmap,
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* limiting the depth used from each word.
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* @sb: Bitmap to allocate from.
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* @alloc_hint: Hint for where to start searching for a free bit.
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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*
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* This rather specific operation allows for having multiple users with
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* different allocation limits. E.g., there can be a high-priority class that
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* uses sbitmap_get() and a low-priority class that uses sbitmap_get_shallow()
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* with a @shallow_depth of (1 << (@sb->shift - 1)). Then, the low-priority
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* class can only allocate half of the total bits in the bitmap, preventing it
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* from starving out the high-priority class.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int sbitmap_get_shallow(struct sbitmap *sb, unsigned int alloc_hint,
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unsigned long shallow_depth);
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/**
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* sbitmap_any_bit_set() - Check for a set bit in a &struct sbitmap.
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* @sb: Bitmap to check.
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*
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* Return: true if any bit in the bitmap is set, false otherwise.
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*/
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bool sbitmap_any_bit_set(const struct sbitmap *sb);
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/**
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* sbitmap_any_bit_clear() - Check for an unset bit in a &struct
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* sbitmap.
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* @sb: Bitmap to check.
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*
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* Return: true if any bit in the bitmap is clear, false otherwise.
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*/
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bool sbitmap_any_bit_clear(const struct sbitmap *sb);
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#define SB_NR_TO_INDEX(sb, bitnr) ((bitnr) >> (sb)->shift)
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#define SB_NR_TO_BIT(sb, bitnr) ((bitnr) & ((1U << (sb)->shift) - 1U))
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typedef bool (*sb_for_each_fn)(struct sbitmap *, unsigned int, void *);
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/**
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* __sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap.
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* @start: Where to start the iteration.
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* @sb: Bitmap to iterate over.
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* @fn: Callback. Should return true to continue or false to break early.
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* @data: Pointer to pass to callback.
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*
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* This is inline even though it's non-trivial so that the function calls to the
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* callback will hopefully get optimized away.
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*/
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static inline void __sbitmap_for_each_set(struct sbitmap *sb,
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unsigned int start,
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sb_for_each_fn fn, void *data)
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{
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unsigned int index;
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unsigned int nr;
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unsigned int scanned = 0;
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if (start >= sb->depth)
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start = 0;
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index = SB_NR_TO_INDEX(sb, start);
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nr = SB_NR_TO_BIT(sb, start);
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while (scanned < sb->depth) {
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unsigned long word;
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unsigned int depth = min_t(unsigned int,
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sb->map[index].depth - nr,
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sb->depth - scanned);
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scanned += depth;
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word = sb->map[index].word & ~sb->map[index].cleared;
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if (!word)
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goto next;
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/*
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* On the first iteration of the outer loop, we need to add the
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* bit offset back to the size of the word for find_next_bit().
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* On all other iterations, nr is zero, so this is a noop.
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*/
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depth += nr;
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while (1) {
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nr = find_next_bit(&word, depth, nr);
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if (nr >= depth)
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break;
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if (!fn(sb, (index << sb->shift) + nr, data))
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return;
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nr++;
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}
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next:
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nr = 0;
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if (++index >= sb->map_nr)
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index = 0;
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}
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}
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/**
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* sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap.
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* @sb: Bitmap to iterate over.
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* @fn: Callback. Should return true to continue or false to break early.
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* @data: Pointer to pass to callback.
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*/
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static inline void sbitmap_for_each_set(struct sbitmap *sb, sb_for_each_fn fn,
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void *data)
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{
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__sbitmap_for_each_set(sb, 0, fn, data);
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}
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static inline unsigned long *__sbitmap_word(struct sbitmap *sb,
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unsigned int bitnr)
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{
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return &sb->map[SB_NR_TO_INDEX(sb, bitnr)].word;
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}
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/* Helpers equivalent to the operations in asm/bitops.h and linux/bitmap.h */
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static inline void sbitmap_set_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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set_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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static inline void sbitmap_clear_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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clear_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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/*
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* This one is special, since it doesn't actually clear the bit, rather it
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* sets the corresponding bit in the ->cleared mask instead. Paired with
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* the caller doing sbitmap_deferred_clear() if a given index is full, which
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* will clear the previously freed entries in the corresponding ->word.
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*/
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static inline void sbitmap_deferred_clear_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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unsigned long *addr = &sb->map[SB_NR_TO_INDEX(sb, bitnr)].cleared;
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set_bit(SB_NR_TO_BIT(sb, bitnr), addr);
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}
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static inline void sbitmap_clear_bit_unlock(struct sbitmap *sb,
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unsigned int bitnr)
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{
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clear_bit_unlock(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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static inline int sbitmap_test_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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return test_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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/**
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* sbitmap_show() - Dump &struct sbitmap information to a &struct seq_file.
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* @sb: Bitmap to show.
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* @m: struct seq_file to write to.
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*
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* This is intended for debugging. The format may change at any time.
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*/
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void sbitmap_show(struct sbitmap *sb, struct seq_file *m);
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/**
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* sbitmap_bitmap_show() - Write a hex dump of a &struct sbitmap to a &struct
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* seq_file.
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* @sb: Bitmap to show.
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* @m: struct seq_file to write to.
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*
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* This is intended for debugging. The output isn't guaranteed to be internally
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* consistent.
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*/
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void sbitmap_bitmap_show(struct sbitmap *sb, struct seq_file *m);
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/**
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* sbitmap_queue_init_node() - Initialize a &struct sbitmap_queue on a specific
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* memory node.
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* @sbq: Bitmap queue to initialize.
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* @depth: See sbitmap_init_node().
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* @shift: See sbitmap_init_node().
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* @round_robin: See sbitmap_get().
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* @flags: Allocation flags.
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* @node: Memory node to allocate on.
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*
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* Return: Zero on success or negative errno on failure.
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*/
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int sbitmap_queue_init_node(struct sbitmap_queue *sbq, unsigned int depth,
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int shift, bool round_robin, gfp_t flags, int node);
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/**
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* sbitmap_queue_free() - Free memory used by a &struct sbitmap_queue.
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*
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* @sbq: Bitmap queue to free.
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*/
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static inline void sbitmap_queue_free(struct sbitmap_queue *sbq)
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{
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kfree(sbq->ws);
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free_percpu(sbq->alloc_hint);
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sbitmap_free(&sbq->sb);
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}
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/**
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* sbitmap_queue_resize() - Resize a &struct sbitmap_queue.
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* @sbq: Bitmap queue to resize.
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* @depth: New number of bits to resize to.
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*
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* Like sbitmap_resize(), this doesn't reallocate anything. It has to do
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* some extra work on the &struct sbitmap_queue, so it's not safe to just
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* resize the underlying &struct sbitmap.
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*/
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void sbitmap_queue_resize(struct sbitmap_queue *sbq, unsigned int depth);
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/**
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* __sbitmap_queue_get() - Try to allocate a free bit from a &struct
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* sbitmap_queue with preemption already disabled.
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* @sbq: Bitmap queue to allocate from.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int __sbitmap_queue_get(struct sbitmap_queue *sbq);
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/**
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* __sbitmap_queue_get_shallow() - Try to allocate a free bit from a &struct
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* sbitmap_queue, limiting the depth used from each word, with preemption
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* already disabled.
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* @sbq: Bitmap queue to allocate from.
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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* See sbitmap_get_shallow().
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*
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* If you call this, make sure to call sbitmap_queue_min_shallow_depth() after
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* initializing @sbq.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int __sbitmap_queue_get_shallow(struct sbitmap_queue *sbq,
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unsigned int shallow_depth);
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/**
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* sbitmap_queue_get() - Try to allocate a free bit from a &struct
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* sbitmap_queue.
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* @sbq: Bitmap queue to allocate from.
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* @cpu: Output parameter; will contain the CPU we ran on (e.g., to be passed to
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* sbitmap_queue_clear()).
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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static inline int sbitmap_queue_get(struct sbitmap_queue *sbq,
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unsigned int *cpu)
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{
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int nr;
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*cpu = get_cpu();
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nr = __sbitmap_queue_get(sbq);
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put_cpu();
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return nr;
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}
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/**
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* sbitmap_queue_get_shallow() - Try to allocate a free bit from a &struct
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* sbitmap_queue, limiting the depth used from each word.
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* @sbq: Bitmap queue to allocate from.
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* @cpu: Output parameter; will contain the CPU we ran on (e.g., to be passed to
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* sbitmap_queue_clear()).
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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* See sbitmap_get_shallow().
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*
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* If you call this, make sure to call sbitmap_queue_min_shallow_depth() after
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* initializing @sbq.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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static inline int sbitmap_queue_get_shallow(struct sbitmap_queue *sbq,
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unsigned int *cpu,
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unsigned int shallow_depth)
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{
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int nr;
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*cpu = get_cpu();
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nr = __sbitmap_queue_get_shallow(sbq, shallow_depth);
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put_cpu();
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return nr;
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}
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/**
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* sbitmap_queue_min_shallow_depth() - Inform a &struct sbitmap_queue of the
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* minimum shallow depth that will be used.
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* @sbq: Bitmap queue in question.
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* @min_shallow_depth: The minimum shallow depth that will be passed to
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* sbitmap_queue_get_shallow() or __sbitmap_queue_get_shallow().
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*
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* sbitmap_queue_clear() batches wakeups as an optimization. The batch size
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* depends on the depth of the bitmap. Since the shallow allocation functions
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* effectively operate with a different depth, the shallow depth must be taken
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* into account when calculating the batch size. This function must be called
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* with the minimum shallow depth that will be used. Failure to do so can result
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* in missed wakeups.
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*/
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void sbitmap_queue_min_shallow_depth(struct sbitmap_queue *sbq,
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unsigned int min_shallow_depth);
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|
|
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/**
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|
* sbitmap_queue_clear() - Free an allocated bit and wake up waiters on a
|
|
* &struct sbitmap_queue.
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* @sbq: Bitmap to free from.
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|
* @nr: Bit number to free.
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|
* @cpu: CPU the bit was allocated on.
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|
*/
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|
void sbitmap_queue_clear(struct sbitmap_queue *sbq, unsigned int nr,
|
|
unsigned int cpu);
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|
|
|
static inline int sbq_index_inc(int index)
|
|
{
|
|
return (index + 1) & (SBQ_WAIT_QUEUES - 1);
|
|
}
|
|
|
|
static inline void sbq_index_atomic_inc(atomic_t *index)
|
|
{
|
|
int old = atomic_read(index);
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|
int new = sbq_index_inc(old);
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|
atomic_cmpxchg(index, old, new);
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|
}
|
|
|
|
/**
|
|
* sbq_wait_ptr() - Get the next wait queue to use for a &struct
|
|
* sbitmap_queue.
|
|
* @sbq: Bitmap queue to wait on.
|
|
* @wait_index: A counter per "user" of @sbq.
|
|
*/
|
|
static inline struct sbq_wait_state *sbq_wait_ptr(struct sbitmap_queue *sbq,
|
|
atomic_t *wait_index)
|
|
{
|
|
struct sbq_wait_state *ws;
|
|
|
|
ws = &sbq->ws[atomic_read(wait_index)];
|
|
sbq_index_atomic_inc(wait_index);
|
|
return ws;
|
|
}
|
|
|
|
/**
|
|
* sbitmap_queue_wake_all() - Wake up everything waiting on a &struct
|
|
* sbitmap_queue.
|
|
* @sbq: Bitmap queue to wake up.
|
|
*/
|
|
void sbitmap_queue_wake_all(struct sbitmap_queue *sbq);
|
|
|
|
/**
|
|
* sbitmap_queue_wake_up() - Wake up some of waiters in one waitqueue
|
|
* on a &struct sbitmap_queue.
|
|
* @sbq: Bitmap queue to wake up.
|
|
*/
|
|
void sbitmap_queue_wake_up(struct sbitmap_queue *sbq);
|
|
|
|
/**
|
|
* sbitmap_queue_show() - Dump &struct sbitmap_queue information to a &struct
|
|
* seq_file.
|
|
* @sbq: Bitmap queue to show.
|
|
* @m: struct seq_file to write to.
|
|
*
|
|
* This is intended for debugging. The format may change at any time.
|
|
*/
|
|
void sbitmap_queue_show(struct sbitmap_queue *sbq, struct seq_file *m);
|
|
|
|
struct sbq_wait {
|
|
struct sbitmap_queue *sbq; /* if set, sbq_wait is accounted */
|
|
struct wait_queue_entry wait;
|
|
};
|
|
|
|
#define DEFINE_SBQ_WAIT(name) \
|
|
struct sbq_wait name = { \
|
|
.sbq = NULL, \
|
|
.wait = { \
|
|
.private = current, \
|
|
.func = autoremove_wake_function, \
|
|
.entry = LIST_HEAD_INIT((name).wait.entry), \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* Wrapper around prepare_to_wait_exclusive(), which maintains some extra
|
|
* internal state.
|
|
*/
|
|
void sbitmap_prepare_to_wait(struct sbitmap_queue *sbq,
|
|
struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait, int state);
|
|
|
|
/*
|
|
* Must be paired with sbitmap_prepare_to_wait().
|
|
*/
|
|
void sbitmap_finish_wait(struct sbitmap_queue *sbq, struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait);
|
|
|
|
/*
|
|
* Wrapper around add_wait_queue(), which maintains some extra internal state
|
|
*/
|
|
void sbitmap_add_wait_queue(struct sbitmap_queue *sbq,
|
|
struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait);
|
|
|
|
/*
|
|
* Must be paired with sbitmap_add_wait_queue()
|
|
*/
|
|
void sbitmap_del_wait_queue(struct sbq_wait *sbq_wait);
|
|
|
|
#endif /* __LINUX_SCALE_BITMAP_H */
|