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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
#include <mlx5_core.h>
#include "fs_pool.h"
int mlx5_fs_bulk_init(struct mlx5_core_dev *dev, struct mlx5_fs_bulk *fs_bulk,
int bulk_len)
{
int i;
fs_bulk->bitmask = kvcalloc(BITS_TO_LONGS(bulk_len), sizeof(unsigned long),
GFP_KERNEL);
if (!fs_bulk->bitmask)
return -ENOMEM;
fs_bulk->bulk_len = bulk_len;
for (i = 0; i < bulk_len; i++)
set_bit(i, fs_bulk->bitmask);
return 0;
}
void mlx5_fs_bulk_cleanup(struct mlx5_fs_bulk *fs_bulk)
{
kvfree(fs_bulk->bitmask);
}
int mlx5_fs_bulk_get_free_amount(struct mlx5_fs_bulk *bulk)
{
return bitmap_weight(bulk->bitmask, bulk->bulk_len);
}
static int mlx5_fs_bulk_acquire_index(struct mlx5_fs_bulk *fs_bulk,
struct mlx5_fs_pool_index *pool_index)
{
int free_index = find_first_bit(fs_bulk->bitmask, fs_bulk->bulk_len);
WARN_ON_ONCE(!pool_index || !fs_bulk);
if (free_index >= fs_bulk->bulk_len)
return -ENOSPC;
clear_bit(free_index, fs_bulk->bitmask);
pool_index->fs_bulk = fs_bulk;
pool_index->index = free_index;
return 0;
}
static int mlx5_fs_bulk_release_index(struct mlx5_fs_bulk *fs_bulk, int index)
{
if (test_bit(index, fs_bulk->bitmask))
return -EINVAL;
set_bit(index, fs_bulk->bitmask);
return 0;
}
void mlx5_fs_pool_init(struct mlx5_fs_pool *pool, struct mlx5_core_dev *dev,
const struct mlx5_fs_pool_ops *ops, void *pool_ctx)
{
WARN_ON_ONCE(!ops || !ops->bulk_destroy || !ops->bulk_create ||
!ops->update_threshold);
pool->dev = dev;
pool->pool_ctx = pool_ctx;
mutex_init(&pool->pool_lock);
INIT_LIST_HEAD(&pool->fully_used);
INIT_LIST_HEAD(&pool->partially_used);
INIT_LIST_HEAD(&pool->unused);
pool->available_units = 0;
pool->used_units = 0;
pool->threshold = 0;
pool->ops = ops;
}
void mlx5_fs_pool_cleanup(struct mlx5_fs_pool *pool)
{
struct mlx5_core_dev *dev = pool->dev;
struct mlx5_fs_bulk *bulk;
struct mlx5_fs_bulk *tmp;
list_for_each_entry_safe(bulk, tmp, &pool->fully_used, pool_list)
pool->ops->bulk_destroy(dev, bulk);
list_for_each_entry_safe(bulk, tmp, &pool->partially_used, pool_list)
pool->ops->bulk_destroy(dev, bulk);
list_for_each_entry_safe(bulk, tmp, &pool->unused, pool_list)
pool->ops->bulk_destroy(dev, bulk);
}
static struct mlx5_fs_bulk *
mlx5_fs_pool_alloc_new_bulk(struct mlx5_fs_pool *fs_pool)
{
struct mlx5_core_dev *dev = fs_pool->dev;
struct mlx5_fs_bulk *new_bulk;
new_bulk = fs_pool->ops->bulk_create(dev, fs_pool->pool_ctx);
if (new_bulk)
fs_pool->available_units += new_bulk->bulk_len;
fs_pool->ops->update_threshold(fs_pool);
return new_bulk;
}
static void
mlx5_fs_pool_free_bulk(struct mlx5_fs_pool *fs_pool, struct mlx5_fs_bulk *bulk)
{
struct mlx5_core_dev *dev = fs_pool->dev;
fs_pool->available_units -= bulk->bulk_len;
fs_pool->ops->bulk_destroy(dev, bulk);
fs_pool->ops->update_threshold(fs_pool);
}
static int
mlx5_fs_pool_acquire_from_list(struct list_head *src_list,
struct list_head *next_list,
bool move_non_full_bulk,
struct mlx5_fs_pool_index *pool_index)
{
struct mlx5_fs_bulk *fs_bulk;
int err;
if (list_empty(src_list))
return -ENODATA;
fs_bulk = list_first_entry(src_list, struct mlx5_fs_bulk, pool_list);
err = mlx5_fs_bulk_acquire_index(fs_bulk, pool_index);
if (move_non_full_bulk || mlx5_fs_bulk_get_free_amount(fs_bulk) == 0)
list_move(&fs_bulk->pool_list, next_list);
return err;
}
int mlx5_fs_pool_acquire_index(struct mlx5_fs_pool *fs_pool,
struct mlx5_fs_pool_index *pool_index)
{
struct mlx5_fs_bulk *new_bulk;
int err;
mutex_lock(&fs_pool->pool_lock);
err = mlx5_fs_pool_acquire_from_list(&fs_pool->partially_used,
&fs_pool->fully_used, false,
pool_index);
if (err)
err = mlx5_fs_pool_acquire_from_list(&fs_pool->unused,
&fs_pool->partially_used,
true, pool_index);
if (err) {
new_bulk = mlx5_fs_pool_alloc_new_bulk(fs_pool);
if (!new_bulk) {
err = -ENOENT;
goto out;
}
err = mlx5_fs_bulk_acquire_index(new_bulk, pool_index);
WARN_ON_ONCE(err);
list_add(&new_bulk->pool_list, &fs_pool->partially_used);
}
fs_pool->available_units--;
fs_pool->used_units++;
out:
mutex_unlock(&fs_pool->pool_lock);
return err;
}
int mlx5_fs_pool_release_index(struct mlx5_fs_pool *fs_pool,
struct mlx5_fs_pool_index *pool_index)
{
struct mlx5_fs_bulk *bulk = pool_index->fs_bulk;
int bulk_free_amount;
int err;
mutex_lock(&fs_pool->pool_lock);
/* TBD would rather return void if there was no warn here in original code */
err = mlx5_fs_bulk_release_index(bulk, pool_index->index);
if (err)
goto unlock;
fs_pool->available_units++;
fs_pool->used_units--;
bulk_free_amount = mlx5_fs_bulk_get_free_amount(bulk);
if (bulk_free_amount == 1)
list_move_tail(&bulk->pool_list, &fs_pool->partially_used);
if (bulk_free_amount == bulk->bulk_len) {
list_del(&bulk->pool_list);
if (fs_pool->available_units > fs_pool->threshold)
mlx5_fs_pool_free_bulk(fs_pool, bulk);
else
list_add(&bulk->pool_list, &fs_pool->unused);
}
unlock:
mutex_unlock(&fs_pool->pool_lock);
return err;
}
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