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/*
* 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/types.h>
#include "kfd_priv.h"
static unsigned int pasid_bits = 16;
static const struct kfd2kgd_calls *kfd2kgd;
bool kfd_set_pasid_limit(unsigned int new_limit)
{
if (new_limit < 2)
return false;
if (new_limit < (1U << pasid_bits)) {
if (kfd2kgd)
/* We've already allocated user PASIDs, too late to
* change the limit
*/
return false;
while (new_limit < (1U << pasid_bits))
pasid_bits--;
}
return true;
}
unsigned int kfd_get_pasid_limit(void)
{
return 1U << pasid_bits;
}
unsigned int kfd_pasid_alloc(void)
{
int r;
/* Find the first best KFD device for calling KGD */
if (!kfd2kgd) {
struct kfd_dev *dev = NULL;
unsigned int i = 0;
while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
if (dev && dev->kfd2kgd) {
kfd2kgd = dev->kfd2kgd;
break;
}
i++;
}
if (!kfd2kgd)
return false;
}
r = kfd2kgd->alloc_pasid(pasid_bits);
return r > 0 ? r : 0;
}
void kfd_pasid_free(unsigned int pasid)
{
if (kfd2kgd)
kfd2kgd->free_pasid(pasid);
}
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