You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
2.4 KiB
97 lines
2.4 KiB
/*
|
|
* Copyright 2014 Advanced Micro Devices, Inc.
|
|
*
|
|
* 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include "kfd_priv.h"
|
|
|
|
static unsigned long *pasid_bitmap;
|
|
static unsigned int pasid_limit;
|
|
static DEFINE_MUTEX(pasid_mutex);
|
|
|
|
int kfd_pasid_init(void)
|
|
{
|
|
pasid_limit = KFD_MAX_NUM_OF_PROCESSES;
|
|
|
|
pasid_bitmap = kcalloc(BITS_TO_LONGS(pasid_limit), sizeof(long),
|
|
GFP_KERNEL);
|
|
if (!pasid_bitmap)
|
|
return -ENOMEM;
|
|
|
|
set_bit(0, pasid_bitmap); /* PASID 0 is reserved. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
void kfd_pasid_exit(void)
|
|
{
|
|
kfree(pasid_bitmap);
|
|
}
|
|
|
|
bool kfd_set_pasid_limit(unsigned int new_limit)
|
|
{
|
|
if (new_limit < pasid_limit) {
|
|
bool ok;
|
|
|
|
mutex_lock(&pasid_mutex);
|
|
|
|
/* ensure that no pasids >= new_limit are in-use */
|
|
ok = (find_next_bit(pasid_bitmap, pasid_limit, new_limit) ==
|
|
pasid_limit);
|
|
if (ok)
|
|
pasid_limit = new_limit;
|
|
|
|
mutex_unlock(&pasid_mutex);
|
|
|
|
return ok;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
inline unsigned int kfd_get_pasid_limit(void)
|
|
{
|
|
return pasid_limit;
|
|
}
|
|
|
|
unsigned int kfd_pasid_alloc(void)
|
|
{
|
|
unsigned int found;
|
|
|
|
mutex_lock(&pasid_mutex);
|
|
|
|
found = find_first_zero_bit(pasid_bitmap, pasid_limit);
|
|
if (found == pasid_limit)
|
|
found = 0;
|
|
else
|
|
set_bit(found, pasid_bitmap);
|
|
|
|
mutex_unlock(&pasid_mutex);
|
|
|
|
return found;
|
|
}
|
|
|
|
void kfd_pasid_free(unsigned int pasid)
|
|
{
|
|
if (!WARN_ON(pasid == 0 || pasid >= pasid_limit))
|
|
clear_bit(pasid, pasid_bitmap);
|
|
}
|
|
|