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 | |
28 | static unsigned int pasid_bits = 16; |
29 | static bool pasids_allocated; /* = false */ |
30 | |
31 | bool 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 | |
50 | unsigned int kfd_get_pasid_limit(void) |
51 | { |
52 | return 1U << pasid_bits; |
53 | } |
54 | |
55 | u32 kfd_pasid_alloc(void) |
56 | { |
57 | int r = amdgpu_pasid_alloc(bits: pasid_bits); |
58 | |
59 | if (r > 0) { |
60 | pasids_allocated = true; |
61 | return r; |
62 | } |
63 | |
64 | return 0; |
65 | } |
66 | |
67 | void kfd_pasid_free(u32 pasid) |
68 | { |
69 | amdgpu_pasid_free(pasid); |
70 | } |
71 | |