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/*
* SPDX-FileCopyrightText: Copyright (c) 2018 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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 "nv-linux.h"
#include "nv-rsync.h"
nv_rsync_info_t g_rsync_info;
void nv_init_rsync_info(
void
)
{
g_rsync_info.relaxed_ordering_mode = NV_FALSE;
g_rsync_info.usage_count = 0;
g_rsync_info.data = NULL;
NV_INIT_MUTEX(&g_rsync_info.lock);
}
void nv_destroy_rsync_info(
void
)
{
WARN_ON(g_rsync_info.data);
WARN_ON(g_rsync_info.usage_count);
WARN_ON(g_rsync_info.relaxed_ordering_mode);
}
int nv_get_rsync_info(
void
)
{
int mode;
int rc = 0;
down(&g_rsync_info.lock);
if (g_rsync_info.usage_count == 0)
{
if (g_rsync_info.get_relaxed_ordering_mode)
{
rc = g_rsync_info.get_relaxed_ordering_mode(&mode,
g_rsync_info.data);
if (rc != 0)
{
goto done;
}
g_rsync_info.relaxed_ordering_mode = !!mode;
}
}
g_rsync_info.usage_count++;
done:
up(&g_rsync_info.lock);
return rc;
}
void nv_put_rsync_info(
void
)
{
int mode;
down(&g_rsync_info.lock);
g_rsync_info.usage_count--;
if (g_rsync_info.usage_count == 0)
{
if (g_rsync_info.put_relaxed_ordering_mode)
{
mode = g_rsync_info.relaxed_ordering_mode;
g_rsync_info.put_relaxed_ordering_mode(mode, g_rsync_info.data);
g_rsync_info.relaxed_ordering_mode = NV_FALSE;
}
}
up(&g_rsync_info.lock);
}
int nv_register_rsync_driver(
int (*get_relaxed_ordering_mode)(int *mode, void *data),
void (*put_relaxed_ordering_mode)(int mode, void *data),
void (*wait_for_rsync)(struct pci_dev *gpu, void *data),
void *data
)
{
int rc = 0;
down(&g_rsync_info.lock);
if (g_rsync_info.get_relaxed_ordering_mode != NULL)
{
rc = -EBUSY;
goto done;
}
if (g_rsync_info.usage_count != 0)
{
rc = -EBUSY;
goto done;
}
g_rsync_info.get_relaxed_ordering_mode = get_relaxed_ordering_mode;
g_rsync_info.put_relaxed_ordering_mode = put_relaxed_ordering_mode;
g_rsync_info.wait_for_rsync = wait_for_rsync;
g_rsync_info.data = data;
done:
up(&g_rsync_info.lock);
return rc;
}
void nv_unregister_rsync_driver(
int (*get_relaxed_ordering_mode)(int *mode, void *data),
void (*put_relaxed_ordering_mode)(int mode, void *data),
void (*wait_for_rsync)(struct pci_dev *gpu, void *data),
void *data
)
{
down(&g_rsync_info.lock);
WARN_ON(g_rsync_info.usage_count != 0);
WARN_ON(g_rsync_info.get_relaxed_ordering_mode !=
get_relaxed_ordering_mode);
WARN_ON(g_rsync_info.put_relaxed_ordering_mode !=
put_relaxed_ordering_mode);
WARN_ON(g_rsync_info.wait_for_rsync != wait_for_rsync);
WARN_ON(g_rsync_info.data != data);
g_rsync_info.get_relaxed_ordering_mode = NULL;
g_rsync_info.put_relaxed_ordering_mode = NULL;
g_rsync_info.wait_for_rsync = NULL;
g_rsync_info.data = NULL;
up(&g_rsync_info.lock);
}
NvBool nv_get_rsync_relaxed_ordering_mode(
nv_state_t *nv
)
{
nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
/* shouldn't be called without opening a device */
WARN_ON(NV_ATOMIC_READ(nvl->usage_count) == 0);
/*
* g_rsync_info.relaxed_ordering_mode can be safely accessed outside of
* g_rsync_info.lock once a device is opened. During nvidia_open(), we
* lock the relaxed ordering state by ref-counting the rsync module
* through get_relaxed_ordering_mode.
*/
return g_rsync_info.relaxed_ordering_mode;
}
void nv_wait_for_rsync(
nv_state_t *nv
)
{
nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
/* shouldn't be called without opening a device */
WARN_ON(NV_ATOMIC_READ(nvl->usage_count) == 0);
/*
* g_rsync_info.relaxed_ordering_mode can be safely accessed outside of
* g_rsync_info.lock once a device is opened. During nvidia_open(), we
* block unregistration of the rsync driver by ref-counting the module
* through get_relaxed_ordering_mode.
*/
if (g_rsync_info.relaxed_ordering_mode)
{
WARN_ON(g_rsync_info.wait_for_rsync == NULL);
g_rsync_info.wait_for_rsync(nvl->pci_dev, g_rsync_info.data);
}
}
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