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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <linux/bitops.h>
#include "spectrum.h"
#define MLXSW_SP1_KVDL_SINGLE_BASE 0
#define MLXSW_SP1_KVDL_SINGLE_SIZE 16384
#define MLXSW_SP1_KVDL_SINGLE_END \
(MLXSW_SP1_KVDL_SINGLE_SIZE + MLXSW_SP1_KVDL_SINGLE_BASE - 1)
#define MLXSW_SP1_KVDL_CHUNKS_BASE \
(MLXSW_SP1_KVDL_SINGLE_BASE + MLXSW_SP1_KVDL_SINGLE_SIZE)
#define MLXSW_SP1_KVDL_CHUNKS_SIZE 49152
#define MLXSW_SP1_KVDL_CHUNKS_END \
(MLXSW_SP1_KVDL_CHUNKS_SIZE + MLXSW_SP1_KVDL_CHUNKS_BASE - 1)
#define MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE \
(MLXSW_SP1_KVDL_CHUNKS_BASE + MLXSW_SP1_KVDL_CHUNKS_SIZE)
#define MLXSW_SP1_KVDL_LARGE_CHUNKS_SIZE \
(MLXSW_SP_KVD_LINEAR_SIZE - MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE)
#define MLXSW_SP1_KVDL_LARGE_CHUNKS_END \
(MLXSW_SP1_KVDL_LARGE_CHUNKS_SIZE + MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE - 1)
#define MLXSW_SP1_KVDL_SINGLE_ALLOC_SIZE 1
#define MLXSW_SP1_KVDL_CHUNKS_ALLOC_SIZE 32
#define MLXSW_SP1_KVDL_LARGE_CHUNKS_ALLOC_SIZE 512
struct mlxsw_sp1_kvdl_part_info {
unsigned int part_index;
unsigned int start_index;
unsigned int end_index;
unsigned int alloc_size;
enum mlxsw_sp_resource_id resource_id;
};
enum mlxsw_sp1_kvdl_part_id {
MLXSW_SP1_KVDL_PART_ID_SINGLE,
MLXSW_SP1_KVDL_PART_ID_CHUNKS,
MLXSW_SP1_KVDL_PART_ID_LARGE_CHUNKS,
};
#define MLXSW_SP1_KVDL_PART_INFO(id) \
[MLXSW_SP1_KVDL_PART_ID_##id] = { \
.start_index = MLXSW_SP1_KVDL_##id##_BASE, \
.end_index = MLXSW_SP1_KVDL_##id##_END, \
.alloc_size = MLXSW_SP1_KVDL_##id##_ALLOC_SIZE, \
.resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_##id, \
}
static const struct mlxsw_sp1_kvdl_part_info mlxsw_sp1_kvdl_parts_info[] = {
MLXSW_SP1_KVDL_PART_INFO(SINGLE),
MLXSW_SP1_KVDL_PART_INFO(CHUNKS),
MLXSW_SP1_KVDL_PART_INFO(LARGE_CHUNKS),
};
#define MLXSW_SP1_KVDL_PARTS_INFO_LEN ARRAY_SIZE(mlxsw_sp1_kvdl_parts_info)
struct mlxsw_sp1_kvdl_part {
struct mlxsw_sp1_kvdl_part_info info;
unsigned long usage[0]; /* Entries */
};
struct mlxsw_sp1_kvdl {
struct mlxsw_sp1_kvdl_part *parts[MLXSW_SP1_KVDL_PARTS_INFO_LEN];
};
static struct mlxsw_sp1_kvdl_part *
mlxsw_sp1_kvdl_alloc_size_part(struct mlxsw_sp1_kvdl *kvdl,
unsigned int alloc_size)
{
struct mlxsw_sp1_kvdl_part *part, *min_part = NULL;
int i;
for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
part = kvdl->parts[i];
if (alloc_size <= part->info.alloc_size &&
(!min_part ||
part->info.alloc_size <= min_part->info.alloc_size))
min_part = part;
}
return min_part ?: ERR_PTR(-ENOBUFS);
}
static struct mlxsw_sp1_kvdl_part *
mlxsw_sp1_kvdl_index_part(struct mlxsw_sp1_kvdl *kvdl, u32 kvdl_index)
{
struct mlxsw_sp1_kvdl_part *part;
int i;
for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
part = kvdl->parts[i];
if (kvdl_index >= part->info.start_index &&
kvdl_index <= part->info.end_index)
return part;
}
return ERR_PTR(-EINVAL);
}
static u32
mlxsw_sp1_kvdl_to_kvdl_index(const struct mlxsw_sp1_kvdl_part_info *info,
unsigned int entry_index)
{
return info->start_index + entry_index * info->alloc_size;
}
static unsigned int
mlxsw_sp1_kvdl_to_entry_index(const struct mlxsw_sp1_kvdl_part_info *info,
u32 kvdl_index)
{
return (kvdl_index - info->start_index) / info->alloc_size;
}
static int mlxsw_sp1_kvdl_part_alloc(struct mlxsw_sp1_kvdl_part *part,
u32 *p_kvdl_index)
{
const struct mlxsw_sp1_kvdl_part_info *info = &part->info;
unsigned int entry_index, nr_entries;
nr_entries = (info->end_index - info->start_index + 1) /
info->alloc_size;
entry_index = find_first_zero_bit(part->usage, nr_entries);
if (entry_index == nr_entries)
return -ENOBUFS;
__set_bit(entry_index, part->usage);
*p_kvdl_index = mlxsw_sp1_kvdl_to_kvdl_index(info, entry_index);
return 0;
}
static void mlxsw_sp1_kvdl_part_free(struct mlxsw_sp1_kvdl_part *part,
u32 kvdl_index)
{
const struct mlxsw_sp1_kvdl_part_info *info = &part->info;
unsigned int entry_index;
entry_index = mlxsw_sp1_kvdl_to_entry_index(info, kvdl_index);
__clear_bit(entry_index, part->usage);
}
static int mlxsw_sp1_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count,
u32 *p_entry_index)
{
struct mlxsw_sp1_kvdl *kvdl = priv;
struct mlxsw_sp1_kvdl_part *part;
/* Find partition with smallest allocation size satisfying the
* requested size.
*/
part = mlxsw_sp1_kvdl_alloc_size_part(kvdl, entry_count);
if (IS_ERR(part))
return PTR_ERR(part);
return mlxsw_sp1_kvdl_part_alloc(part, p_entry_index);
}
static void mlxsw_sp1_kvdl_free(struct mlxsw_sp *mlxsw_sp, void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count, int entry_index)
{
struct mlxsw_sp1_kvdl *kvdl = priv;
struct mlxsw_sp1_kvdl_part *part;
part = mlxsw_sp1_kvdl_index_part(kvdl, entry_index);
if (IS_ERR(part))
return;
mlxsw_sp1_kvdl_part_free(part, entry_index);
}
static int mlxsw_sp1_kvdl_alloc_size_query(struct mlxsw_sp *mlxsw_sp,
void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count,
unsigned int *p_alloc_size)
{
struct mlxsw_sp1_kvdl *kvdl = priv;
struct mlxsw_sp1_kvdl_part *part;
part = mlxsw_sp1_kvdl_alloc_size_part(kvdl, entry_count);
if (IS_ERR(part))
return PTR_ERR(part);
*p_alloc_size = part->info.alloc_size;
return 0;
}
static void mlxsw_sp1_kvdl_part_update(struct mlxsw_sp1_kvdl_part *part,
struct mlxsw_sp1_kvdl_part *part_prev,
unsigned int size)
{
if (!part_prev) {
part->info.end_index = size - 1;
} else {
part->info.start_index = part_prev->info.end_index + 1;
part->info.end_index = part->info.start_index + size - 1;
}
}
static struct mlxsw_sp1_kvdl_part *
mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
const struct mlxsw_sp1_kvdl_part_info *info,
struct mlxsw_sp1_kvdl_part *part_prev)
{
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
struct mlxsw_sp1_kvdl_part *part;
bool need_update = true;
unsigned int nr_entries;
size_t usage_size;
u64 resource_size;
int err;
err = devlink_resource_size_get(devlink, info->resource_id,
&resource_size);
if (err) {
need_update = false;
resource_size = info->end_index - info->start_index + 1;
}
nr_entries = div_u64(resource_size, info->alloc_size);
usage_size = BITS_TO_LONGS(nr_entries) * sizeof(unsigned long);
part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
if (!part)
return ERR_PTR(-ENOMEM);
memcpy(&part->info, info, sizeof(part->info));
if (need_update)
mlxsw_sp1_kvdl_part_update(part, part_prev, resource_size);
return part;
}
static void mlxsw_sp1_kvdl_part_fini(struct mlxsw_sp1_kvdl_part *part)
{
kfree(part);
}
static int mlxsw_sp1_kvdl_parts_init(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp1_kvdl *kvdl)
{
const struct mlxsw_sp1_kvdl_part_info *info;
struct mlxsw_sp1_kvdl_part *part_prev = NULL;
int err, i;
for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
info = &mlxsw_sp1_kvdl_parts_info[i];
kvdl->parts[i] = mlxsw_sp1_kvdl_part_init(mlxsw_sp, info,
part_prev);
if (IS_ERR(kvdl->parts[i])) {
err =
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