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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2020 Mellanox Technologies Ltd */
#include <linux/mlx5/driver.h>
#include "mlx5_ifc_vhca_event.h"
#include "mlx5_core.h"
#include "vhca_event.h"
#include "ecpf.h"
#define CREATE_TRACE_POINTS
#include "diag/vhca_tracepoint.h"
struct mlx5_vhca_state_notifier {
struct mlx5_core_dev *dev;
struct mlx5_nb nb;
struct blocking_notifier_head n_head;
};
struct mlx5_vhca_event_work {
struct work_struct work;
struct mlx5_vhca_state_notifier *notifier;
struct mlx5_vhca_state_event event;
};
struct mlx5_vhca_event_handler {
struct workqueue_struct *wq;
};
struct mlx5_vhca_events {
struct mlx5_core_dev *dev;
struct mlx5_vhca_event_handler handler[MLX5_DEV_MAX_WQS];
};
int mlx5_cmd_query_vhca_state(struct mlx5_core_dev *dev, u16 function_id, u32 *out, u32 outlen)
{
u32 in[MLX5_ST_SZ_DW(query_vhca_state_in)] = {};
MLX5_SET(query_vhca_state_in, in, opcode, MLX5_CMD_OP_QUERY_VHCA_STATE);
MLX5_SET(query_vhca_state_in, in, function_id, function_id);
MLX5_SET(query_vhca_state_in, in, embedded_cpu_function, 0);
return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
}
static int mlx5_cmd_modify_vhca_state(struct mlx5_core_dev *dev, u16 function_id,
u32 *in, u32 inlen)
{
u32 out[MLX5_ST_SZ_DW(modify_vhca_state_out)] = {};
MLX5_SET(modify_vhca_state_in, in, opcode, MLX5_CMD_OP_MODIFY_VHCA_STATE);
MLX5_SET(modify_vhca_state_in, in, function_id, function_id);
MLX5_SET(modify_vhca_state_in, in, embedded_cpu_function, 0);
return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
}
int mlx5_modify_vhca_sw_id(struct mlx5_core_dev *dev, u16 function_id, u32 sw_fn_id)
{
u32 out[MLX5_ST_SZ_DW(modify_vhca_state_out)] = {};
u32 in[MLX5_ST_SZ_DW(modify_vhca_state_in)] = {};
MLX5_SET(modify_vhca_state_in, in, opcode, MLX5_CMD_OP_MODIFY_VHCA_STATE);
MLX5_SET(modify_vhca_state_in, in, function_id, function_id);
MLX5_SET(modify_vhca_state_in, in, embedded_cpu_function, 0);
MLX5_SET(modify_vhca_state_in, in, vhca_state_field_select.sw_function_id, 1);
MLX5_SET(modify_vhca_state_in, in, vhca_state_context.sw_function_id, sw_fn_id);
return mlx5_cmd_exec_inout(dev, modify_vhca_state, in, out);
}
int mlx5_vhca_event_arm(struct mlx5_core_dev *dev, u16 function_id)
{
u32 in[MLX5_ST_SZ_DW(modify_vhca_state_in)] = {};
MLX5_SET(modify_vhca_state_in, in, vhca_state_context.arm_change_event, 1);
MLX5_SET(modify_vhca_state_in, in, vhca_state_field_select.arm_change_event, 1);
return mlx5_cmd_modify_vhca_state(dev, function_id, in, sizeof(in));
}
static void
mlx5_vhca_event_notify(struct mlx5_core_dev *dev, struct mlx5_vhca_state_event *event)
{
u32 out[MLX5_ST_SZ_DW(query_vhca_state_out)] = {};
int err;
err = mlx5_cmd_query_vhca_state(dev, event->function_id, out, sizeof(out));
if (err)
return;
event->sw_function_id = MLX5_GET(query_vhca_state_out, out,
vhca_state_context.sw_function_id);
event->new_vhca_state = MLX5_GET(query_vhca_state_out, out,
vhca_state_context.vhca_state);
mlx5_vhca_event_arm(dev, event->function_id);
trace_mlx5_sf_vhca_event(dev, event);
blocking_notifier_call_chain(&dev->priv.vhca_state_notifier->n_head, 0, event);
}
static void mlx5_vhca_state_work_handler(struct work_struct *_work)
{
struct mlx5_vhca_event_work *work = container_of(_work, struct mlx5_vhca_event_work, work);
struct mlx5_vhca_state_notifier *notifier = work->notifier;
struct mlx5_core_dev *dev = notifier->dev;
mlx5_vhca_event_notify(dev, &work->event);
kfree(work);
}
void mlx5_vhca_events_work_enqueue(struct mlx5_core_dev *dev, int idx, struct work_struct *work)
{
queue_work(dev->priv.vhca_events->handler[idx].wq, work);
}
static int
mlx5_vhca_state_change_notifier(struct notifier_block *nb, unsigned long type, void *data)
{
struct mlx5_vhca_state_notifier *notifier =
mlx5_nb_cof(nb, struct mlx5_vhca_state_notifier, nb);
struct mlx5_vhca_event_work *work;
struct mlx5_eqe *eqe = data;
int wq_idx;
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work)
return NOTIFY_DONE;
INIT_WORK(&work->work, &mlx5_vhca_state_work_handler);
work->notifier = notifier;
work->event.function_id = be16_to_cpu(eqe->data.vhca_state.function_id);
wq_idx = work->event.function_id % MLX5_DEV_MAX_WQS;
mlx5_vhca_events_work_enqueue(notifier->dev, wq_idx, &work->work);
return NOTIFY_OK;
}
void mlx5_vhca_state_cap_handle(struct mlx5_core_dev *dev, void *set_hca_cap)
{
if (!mlx5_vhca_event_supported(dev))
return;
MLX5_SET(cmd_hca_cap, set_hca_cap, vhca_state, 1);
MLX5_SET(cmd_hca_cap, set_hca_cap, event_on_vhca_state_allocated, 1);
MLX5_SET(cmd_hca_cap, set_hca_cap, event_on_vhca_state_active, 1);
MLX5_SET(cmd_hca_cap, set_hca_cap, event_on_vhca_state_in_use, 1);
MLX5_SET(cmd_hca_cap, set_hca_cap, event_on_vhca_state_teardown_request, 1);
}
int mlx5_vhca_event_init(struct mlx5_core_dev *dev)
{
struct mlx5_vhca_state_notifier *notifier;
char wq_name[MLX5_CMD_WQ_MAX_NAME];
struct mlx5_vhca_events *events;
int err, i;
if (!mlx5_vhca_event_supported(dev))
return 0;
events = kzalloc(sizeof(*events), GFP_KERNEL);
if (!events)
return -ENOMEM;
events->dev = dev;
dev->priv.vhca_events = events;
for (i = 0; i < MLX5_DEV_MAX_WQS; i++) {
snprintf(wq_name, MLX5_CMD_WQ_MAX_NAME, "mlx5_vhca_event%d", i);
events->handler[i].wq = create_singlethread_workqueue(wq_name);
if (!events->handler[i].wq) {
err = -ENOMEM;
goto err_create_wq;
}
}
notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
if (!notifier) {
err = -ENOMEM;
goto err_notifier;
}
dev->priv.vhca_state_notifier = notifier;
notifier->dev = dev;
BLOCKING_INIT_NOTIFIER_HEAD(¬ifier->n_head);
MLX5_NB_INIT(¬ifier->nb, mlx5_vhca_state_change_notifier, VHCA_STATE_CHANGE);
return 0;
err_notifier:
err_create_wq:
for (--i; i >= 0; i--)
destroy_workqueue(events->handler[i].wq);
kfree(events);
return err;
}
void mlx5_vhca_event_work_queues_flush(struct mlx5_core_dev *dev)
{
struct mlx5_vhca_events *vhca_events;
int i;
if (!mlx5_vhca_event_supported(dev))
return;
vhca_events = dev->priv.vhca_events;
for (i = 0; i < MLX5_DEV_MAX_WQS; i++)
flush_workqueue(vhca_events->handler[i].wq);
}
void mlx5_vhca_event_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_vhca_events *vhca_events;
int i;
if (!mlx5_vhca_event_supported(dev))
return;
kfree(dev->priv.vhca_state_notifier);
dev->priv.vhca_state_notifier = NULL;
vhca_events = dev->priv.vhca_events;
for (i = 0; i < MLX5_DEV_MAX_WQS; i++)
destroy_workqueue(vhca_events->handler[i].wq);
kvfree(vhca_events);
}
void mlx5_vhca_event_start(struct mlx5_core_dev *dev)
{
struct mlx5_vhca_state_notifier *notifier;
if (!dev->priv.vhca_state_notifier)
return;
notifier = dev->priv.vhca_state_notifier;
mlx5_eq_notifier_register(dev, ¬ifier->nb);
}
void mlx5_vhca_event_stop(struct mlx5_core_dev *dev)
{
struct mlx5_vhca_state_notifier *notifier;
if (!dev->priv.vhca_state_notifier)
return;
notifier = dev->priv.vhca_state_notifier;
mlx5_eq_notifier_unregister(dev, ¬ifier->nb);
}
int mlx5_vhca_event_notifier_register(struct mlx5_core_dev *dev, struct notifier_block *nb)
{
if (!dev->priv.vhca_state_notifier)
return -EOPNOTSUPP;
return blocking_notifier_chain_register(&dev->priv.vhca_state_notifier->n_head, nb);
}
void mlx5_vhca_event_notifier_unregister(struct mlx5_core_dev *dev, struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&dev->priv.vhca_state_notifier->n_head, nb);
}
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