1// SPDX-License-Identifier: GPL-2.0 OR MIT
 2/*
 3 * Copyright 2014-2022 Advanced Micro Devices, Inc.
 4 *
 5 * Permission is hereby granted, free of charge, to any person obtaining a
 6 * copy of this software and associated documentation files (the "Software"),
 7 * to deal in the Software without restriction, including without limitation
 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24#include <linux/types.h>
25#include "kfd_priv.h"
26#include "amdgpu_ids.h"
27
28static unsigned int pasid_bits = 16;
29static bool pasids_allocated; /* = false */
30
31bool kfd_set_pasid_limit(unsigned int new_limit)
32{
33	if (new_limit < 2)
34		return false;
35
36	if (new_limit < (1U << pasid_bits)) {
37		if (pasids_allocated)
38			/* We've already allocated user PASIDs, too late to
39			 * change the limit
40			 */
41			return false;
42
43		while (new_limit < (1U << pasid_bits))
44			pasid_bits--;
45	}
46
47	return true;
48}
49
50unsigned int kfd_get_pasid_limit(void)
51{
52	return 1U << pasid_bits;
53}
54
55u32 kfd_pasid_alloc(void)
56{
57	int r = amdgpu_pasid_alloc(pasid_bits);
58
59	if (r > 0) {
60		pasids_allocated = true;
61		return r;
 
 
 
 
 
 
 
 
 
 
 
 
62	}
63
64	return 0;
 
 
65}
66
67void kfd_pasid_free(u32 pasid)
68{
69	amdgpu_pasid_free(pasid);
 
70}

 
 1/*
 2 * Copyright 2014 Advanced Micro Devices, Inc.
 3 *
 4 * Permission is hereby granted, free of charge, to any person obtaining a
 5 * copy of this software and associated documentation files (the "Software"),
 6 * to deal in the Software without restriction, including without limitation
 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 8 * and/or sell copies of the Software, and to permit persons to whom the
 9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23#include <linux/types.h>
24#include "kfd_priv.h"
 
25
26static unsigned int pasid_bits = 16;
27static const struct kfd2kgd_calls *kfd2kgd;
28
29bool kfd_set_pasid_limit(unsigned int new_limit)
30{
31	if (new_limit < 2)
32		return false;
33
34	if (new_limit < (1U << pasid_bits)) {
35		if (kfd2kgd)
36			/* We've already allocated user PASIDs, too late to
37			 * change the limit
38			 */
39			return false;
40
41		while (new_limit < (1U << pasid_bits))
42			pasid_bits--;
43	}
44
45	return true;
46}
47
48unsigned int kfd_get_pasid_limit(void)
49{
50	return 1U << pasid_bits;
51}
52
53unsigned int kfd_pasid_alloc(void)
54{
55	int r;
56
57	/* Find the first best KFD device for calling KGD */
58	if (!kfd2kgd) {
59		struct kfd_dev *dev = NULL;
60		unsigned int i = 0;
61
62		while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
63			if (dev && dev->kfd2kgd) {
64				kfd2kgd = dev->kfd2kgd;
65				break;
66			}
67			i++;
68		}
69
70		if (!kfd2kgd)
71			return false;
72	}
73
74	r = kfd2kgd->alloc_pasid(pasid_bits);
75
76	return r > 0 ? r : 0;
77}
78
79void kfd_pasid_free(unsigned int pasid)
80{
81	if (kfd2kgd)
82		kfd2kgd->free_pasid(pasid);
83}