1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2014 Advanced Micro Devices, Inc.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission is hereby granted, free of charge, to any person obtaining a
5*4882a593Smuzhiyun * copy of this software and associated documentation files (the "Software"),
6*4882a593Smuzhiyun * to deal in the Software without restriction, including without limitation
7*4882a593Smuzhiyun * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8*4882a593Smuzhiyun * and/or sell copies of the Software, and to permit persons to whom the
9*4882a593Smuzhiyun * Software is furnished to do so, subject to the following conditions:
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * The above copyright notice and this permission notice shall be included in
12*4882a593Smuzhiyun * all copies or substantial portions of the Software.
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15*4882a593Smuzhiyun * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16*4882a593Smuzhiyun * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17*4882a593Smuzhiyun * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18*4882a593Smuzhiyun * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19*4882a593Smuzhiyun * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20*4882a593Smuzhiyun * OTHER DEALINGS IN THE SOFTWARE.
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #include <linux/types.h>
24*4882a593Smuzhiyun #include "kfd_priv.h"
25*4882a593Smuzhiyun #include "amdgpu_ids.h"
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun static unsigned int pasid_bits = 16;
28*4882a593Smuzhiyun static bool pasids_allocated; /* = false */
29*4882a593Smuzhiyun
kfd_set_pasid_limit(unsigned int new_limit)30*4882a593Smuzhiyun bool kfd_set_pasid_limit(unsigned int new_limit)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun if (new_limit < 2)
33*4882a593Smuzhiyun return false;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (new_limit < (1U << pasid_bits)) {
36*4882a593Smuzhiyun if (pasids_allocated)
37*4882a593Smuzhiyun /* We've already allocated user PASIDs, too late to
38*4882a593Smuzhiyun * change the limit
39*4882a593Smuzhiyun */
40*4882a593Smuzhiyun return false;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun while (new_limit < (1U << pasid_bits))
43*4882a593Smuzhiyun pasid_bits--;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun return true;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
kfd_get_pasid_limit(void)49*4882a593Smuzhiyun unsigned int kfd_get_pasid_limit(void)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun return 1U << pasid_bits;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
kfd_pasid_alloc(void)54*4882a593Smuzhiyun u32 kfd_pasid_alloc(void)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun int r = amdgpu_pasid_alloc(pasid_bits);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun if (r > 0) {
59*4882a593Smuzhiyun pasids_allocated = true;
60*4882a593Smuzhiyun return r;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun return 0;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
kfd_pasid_free(u32 pasid)66*4882a593Smuzhiyun void kfd_pasid_free(u32 pasid)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun amdgpu_pasid_free(pasid);
69*4882a593Smuzhiyun }
70