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 #include "amdgpu_ids.h" 26 27 static unsigned int pasid_bits = 16; 28 static bool pasids_allocated; /* = false */ 29 30 bool kfd_set_pasid_limit(unsigned int new_limit) 31 { 32 if (new_limit < 2) 33 return false; 34 35 if (new_limit < (1U << pasid_bits)) { 36 if (pasids_allocated) 37 /* We've already allocated user PASIDs, too late to 38 * change the limit 39 */ 40 return false; 41 42 while (new_limit < (1U << pasid_bits)) 43 pasid_bits--; 44 } 45 46 return true; 47 } 48 49 unsigned int kfd_get_pasid_limit(void) 50 { 51 return 1U << pasid_bits; 52 } 53 54 u32 kfd_pasid_alloc(void) 55 { 56 int r = amdgpu_pasid_alloc(pasid_bits); 57 58 if (r > 0) { 59 pasids_allocated = true; 60 return r; 61 } 62 63 return 0; 64 } 65 66 void kfd_pasid_free(u32 pasid) 67 { 68 amdgpu_pasid_free(pasid); 69 } 70