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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2018 Mellanox Technologies
#include <linux/hyperv.h>
#include "mlx5_core.h"
#include "lib/hv.h"
#include "lib/hv_vhca.h"
struct mlx5_hv_vhca {
struct mlx5_core_dev *dev;
struct workqueue_struct *work_queue;
struct mlx5_hv_vhca_agent *agents[MLX5_HV_VHCA_AGENT_MAX];
struct mutex agents_lock; /* Protect agents array */
};
struct mlx5_hv_vhca_work {
struct work_struct invalidate_work;
struct mlx5_hv_vhca *hv_vhca;
u64 block_mask;
};
struct mlx5_hv_vhca_data_block {
u16 sequence;
u16 offset;
u8 reserved[4];
u64 data[15];
};
struct mlx5_hv_vhca_agent {
enum mlx5_hv_vhca_agent_type type;
struct mlx5_hv_vhca *hv_vhca;
void *priv;
u16 seq;
void (*control)(struct mlx5_hv_vhca_agent *agent,
struct mlx5_hv_vhca_control_block *block);
void (*invalidate)(struct mlx5_hv_vhca_agent *agent,
u64 block_mask);
void (*cleanup)(struct mlx5_hv_vhca_agent *agent);
};
struct mlx5_hv_vhca *mlx5_hv_vhca_create(struct mlx5_core_dev *dev)
{
struct mlx5_hv_vhca *hv_vhca = NULL;
hv_vhca = kzalloc(sizeof(*hv_vhca), GFP_KERNEL);
if (!hv_vhca)
return ERR_PTR(-ENOMEM);
hv_vhca->work_queue = create_singlethread_workqueue("mlx5_hv_vhca");
if (!hv_vhca->work_queue) {
kfree(hv_vhca);
return ERR_PTR(-ENOMEM);
}
hv_vhca->dev = dev;
mutex_init(&hv_vhca->agents_lock);
return hv_vhca;
}
void mlx5_hv_vhca_destroy(struct mlx5_hv_vhca *hv_vhca)
{
if (IS_ERR_OR_NULL(hv_vhca))
return;
destroy_workqueue(hv_vhca->work_queue);
kfree(hv_vhca);
}
static void mlx5_hv_vhca_invalidate_work(struct work_struct *work)
{
struct mlx5_hv_vhca_work *hwork;
struct mlx5_hv_vhca *hv_vhca;
int i;
hwork = container_of(work, struct mlx5_hv_vhca_work, invalidate_work);
hv_vhca = hwork->hv_vhca;
mutex_lock(&hv_vhca->agents_lock);
for (i = 0; i < MLX5_HV_VHCA_AGENT_MAX; i++) {
struct mlx5_hv_vhca_agent *agent = hv_vhca->agents[i];
if (!agent || !agent->invalidate)
continue;
if (!(BIT(agent->type) & hwork->block_mask))
continue;
agent->invalidate(agent, hwork->block_mask);
}
mutex_unlock(&hv_vhca->agents_lock);
kfree(hwork);
}
void mlx5_hv_vhca_invalidate(void *context, u64 block_mask)
{
struct mlx5_hv_vhca *hv_vhca = (struct mlx5_hv_vhca *)context;
struct mlx5_hv_vhca_work *work;
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work)
return;
INIT_WORK(&work->invalidate_work, mlx5_hv_vhca_invalidate_work);
work->hv_vhca = hv_vhca;
work->block_mask = block_mask;
queue_work(hv_vhca->work_queue, &work->invalidate_work);
}
int mlx5_hv_vhca_init(struct mlx5_hv_vhca *hv_vhca)
{
if (IS_ERR_OR_NULL(hv_vhca))
return IS_ERR_OR_NULL(hv_vhca);
return mlx5_hv_register_invalidate(hv_vhca->dev, hv_vhca,
mlx5_hv_vhca_invalidate);
}
void mlx5_hv_vhca_cleanup(struct mlx5_hv_vhca *hv_vhca)
{
int i;
if (IS_ERR_OR_NULL(hv_vhca))
return;
mutex_lock(&hv_vhca->agents_lock);
for (i = 0; i < MLX5_HV_VHCA_AGENT_MAX; i++)
WARN_ON(hv_vhca->agents[i]);
mutex_unlock(&hv_vhca->agents_lock);
mlx5_hv_unregister_invalidate(hv_vhca->dev);
}
struct mlx5_hv_vhca_agent *
mlx5_hv_vhca_agent_create(struct mlx5_hv_vhca *hv_vhca,
enum mlx5_hv_vhca_agent_type type,
void (*control)(struct mlx5_hv_vhca_agent*,
struct mlx5_hv_vhca_control_block *block),
void (*invalidate)(struct mlx5_hv_vhca_agent*,
u64 block_mask),
void (*cleaup)(struct mlx5_hv_vhca_agent *agent),
void *priv)
{
struct mlx5_hv_vhca_agent *agent;
if (IS_ERR_OR_NULL(hv_vhca))
return ERR_PTR(-ENOMEM);
if (type >= MLX5_HV_VHCA_AGENT_MAX)
return ERR_PTR(-EINVAL);
mutex_lock(&hv_vhca->agents_lock);
if (hv_vhca->agents[type]) {
mutex_unlock(&hv_vhca->agents_lock);
return ERR_PTR(-EINVAL);
}
mutex_unlock(&hv_vhca->agents_lock);
agent = kzalloc(sizeof(*agent), GFP_KERNEL);
if (!agent)
return ERR_PTR(-ENOMEM);
agent->type = type;
agent->hv_vhca = hv_vhca;
agent->priv = priv;
agent->control = control;
agent->invalidate = invalidate;
agent->cleanup = cleaup;
mutex_lock(&hv_vhca->agents_lock);
hv_vhca->agents[type] = agent;
mutex_unlock(&hv_vhca->agents_lock);
return agent;
}
void mlx5_hv_vhca_agent_destroy(struct mlx5_hv_vhca_agent *agent)
{
struct mlx5_hv_vhca *hv_vhca = agent->hv_vhca;
mutex_lock(&hv_vhca->agents_lock);
if (WARN_ON(agent != hv_vhca->agents[agent->type])) {
mutex_unlock(&hv_vhca->agents_lock);
return;
}
hv_vhca->agents[agent->type] = NULL;
mutex_unlock(&hv_vhca->agents_lock);
if (agent->cleanup)
agent->cleanup(agent);
kfree(agent);
}
static int mlx5_hv_vhca_data_block_prepare(struct mlx5_hv_vhca_agent *agent,
struct mlx5_hv_vhca_data_block *data_block,
void *src, int len, int *offset)
{
int bytes = min_t(int, (int)sizeof(data_block->data), len);
data_block->sequence = agent->seq;
data_block->offset = (*offset)++;
memcpy(data_block->data, src, bytes);
return bytes;
}
static void mlx5_hv_vhca_agent_seq_update(struct mlx5_hv_vhca_agent *agent)
{
agent->seq++;
}
int mlx5_hv_vhca_agent_write(struct mlx5_hv_vhca_agent *agent,
void *buf, int len)
{
int offset = agent->type * HV_CONFIG_BLOCK_SIZE_MAX;
int block_offset = 0;
int total = 0;
int err;
while (len) {
struct mlx5_hv_vhca_data_block data_block = {0};
int bytes;
bytes = mlx5_hv_vhca_data_block_prepare(agent, &data_block,
buf + total,
len, &block_offset);
if (!bytes)
return -ENOMEM;
err = mlx5_hv_write_config(agent->hv_vhca->dev, &data_block,
sizeof(data_block), offset);
if (err)
return err;
total += bytes;
len -= bytes;
}
mlx5_hv_vhca_agent_seq_update(agent);
return 0;
}
void *mlx5_hv_vhca_agent_priv(struct mlx5_hv_vhca_agent *agent)
{
return agent->priv;
}
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