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/*
* Copyright (c) 2014 Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "mlx5_ib.h"
struct workqueue_struct *mlx5_ib_page_fault_wq;
#define COPY_ODP_BIT_MLX_TO_IB(reg, ib_caps, field_name, bit_name) do { \
if (be32_to_cpu(reg.field_name) & MLX5_ODP_SUPPORT_##bit_name) \
ib_caps->field_name |= IB_ODP_SUPPORT_##bit_name; \
} while (0)
int mlx5_ib_internal_query_odp_caps(struct mlx5_ib_dev *dev)
{
int err;
struct mlx5_odp_caps hw_caps;
struct ib_odp_caps *caps = &dev->odp_caps;
memset(caps, 0, sizeof(*caps));
if (!(dev->mdev->caps.gen.flags & MLX5_DEV_CAP_FLAG_ON_DMND_PG))
return 0;
err = mlx5_query_odp_caps(dev->mdev, &hw_caps);
if (err)
goto out;
/* At this point we would copy the capability bits that the driver
* supports from the hw_caps struct to the caps struct. However, no
* such capabilities are supported so far. */
out:
return err;
}
static struct mlx5_ib_mr *mlx5_ib_odp_find_mr_lkey(struct mlx5_ib_dev *dev,
u32 key)
{
u32 base_key = mlx5_base_mkey(key);
struct mlx5_core_mr *mmr = __mlx5_mr_lookup(dev->mdev, base_key);
if (!mmr || mmr->key != key)
return NULL;
return container_of(mmr, struct mlx5_ib_mr, mmr);
}
static void mlx5_ib_page_fault_resume(struct mlx5_ib_qp *qp,
struct mlx5_ib_pfault *pfault,
int error) {
struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.pd->device);
int ret = mlx5_core_page_fault_resume(dev->mdev, qp->mqp.qpn,
pfault->mpfault.flags,
error);
if (ret)
pr_err("Failed to resolve the page fault on QP 0x%x\n",
qp->mqp.qpn);
}
void mlx5_ib_mr_pfault_handler(struct mlx5_ib_qp *qp,
struct mlx5_ib_pfault *pfault)
{
u8 event_subtype = pfault->mpfault.event_subtype;
switch (event_subtype) {
default:
pr_warn("Invalid page fault event subtype: 0x%x\n",
event_subtype);
mlx5_ib_page_fault_resume(qp, pfault, 1);
break;
}
}
static void mlx5_ib_qp_pfault_action(struct work_struct *work)
{
struct mlx5_ib_pfault *pfault = container_of(work,
struct mlx5_ib_pfault,
work);
enum mlx5_ib_pagefault_context context =
mlx5_ib_get_pagefault_context(&pfault->mpfault);
struct mlx5_ib_qp *qp = container_of(pfault, struct mlx5_ib_qp,
pagefaults[context]);
mlx5_ib_mr_pfault_handler(qp, pfault);
}
void mlx5_ib_qp_disable_pagefaults(struct mlx5_ib_qp *qp)
{
unsigned long flags;
spin_lock_irqsave(&qp->disable_page_faults_lock, flags);
qp->disable_page_faults = 1;
spin_unlock_irqrestore(&qp->disable_page_faults_lock, flags);
/*
* Note that at this point, we are guarenteed that no more
* work queue elements will be posted to the work queue with
* the QP we are closing.
*/
flush_workqueue(mlx5_ib_page_fault_wq);
}
void mlx5_ib_qp_enable_pagefaults(struct mlx5_ib_qp *qp)
{
unsigned long flags;
spin_lock_irqsave(&qp->disable_page_faults_lock, flags);
qp->disable_page_faults = 0;
spin_unlock_irqrestore(&qp->disable_page_faults_lock, flags);
}
static void mlx5_ib_pfault_handler(struct mlx5_core_qp *qp,
struct mlx5_pagefault *pfault)
{
/*
* Note that we will only get one fault event per QP per context
* (responder/initiator, read/write), until we resolve the page fault
* with the mlx5_ib_page_fault_resume command. Since this function is
* called from within the work element, there is no risk of missing
* events.
*/
struct mlx5_ib_qp *mibqp = to_mibqp(qp);
enum mlx5_ib_pagefault_context context =
mlx5_ib_get_pagefault_context(pfault);
struct mlx5_ib_pfault *qp_pfault = &mibqp->pagefaults[context];
qp_pfault->mpfault = *pfault;
/* No need to stop interrupts here since we are in an interrupt */
spin_lock(&mibqp->disable_page_faults_lock);
if (!mibqp->disable_page_faults)
queue_work(mlx5_ib_page_fault_wq, &qp_pfault->work);
spin_unlock(&mibqp->disable_page_faults_lock);
}
void mlx5_ib_odp_create_qp(struct mlx5_ib_qp *qp)
{
int i;
qp->disable_page_faults = 1;
spin_lock_init(&qp->disable_page_faults_lock);
qp->mqp.pfault_handler = mlx5_ib_pfault_handler;
for (i = 0; i < MLX5_IB_PAGEFAULT_CONTEXTS; ++i)
INIT_WORK(&qp->pagefaults[i].work, mlx5_ib_qp_pfault_action);
}
int mlx5_ib_odp_init_one(struct mlx5_ib_dev *ibdev)
{
int ret;
ret = init_srcu_struct(&ibdev->mr_srcu);
if (ret)
return ret;
return 0;
}
void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev)
{
cleanup_srcu_struct(&ibdev->mr_srcu);
}
int __init mlx5_ib_odp_init(void)
{
mlx5_ib_page_fault_wq =
create_singlethread_workqueue("mlx5_ib_page_faults");
if (!mlx5_ib_page_fault_wq)
return -ENOMEM;
return 0;
}
void mlx5_ib_odp_cleanup(void)
{
destroy_workqueue(mlx5_ib_page_fault_wq);
}
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