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(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