1/* $NetBSD: amdgpu_vm_cpu.c,v 1.2 2021/12/18 23:44:58 riastradh Exp $ */ 2 3/* 4 * Copyright 2019 Advanced Micro Devices, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25#include <sys/cdefs.h> 26__KERNEL_RCSID(0, "$NetBSD: amdgpu_vm_cpu.c,v 1.2 2021/12/18 23:44:58 riastradh Exp $"); 27 28#include "amdgpu_vm.h" 29#include "amdgpu_object.h" 30#include "amdgpu_trace.h" 31 32/** 33 * amdgpu_vm_cpu_map_table - make sure new PDs/PTs are kmapped 34 * 35 * @table: newly allocated or validated PD/PT 36 */ 37static int amdgpu_vm_cpu_map_table(struct amdgpu_bo *table) 38{ 39 return amdgpu_bo_kmap(table, NULL); 40} 41 42/** 43 * amdgpu_vm_cpu_prepare - prepare page table update with the CPU 44 * 45 * @p: see amdgpu_vm_update_params definition 46 * @owner: owner we need to sync to 47 * @exclusive: exclusive move fence we need to sync to 48 * 49 * Returns: 50 * Negativ errno, 0 for success. 51 */ 52static int amdgpu_vm_cpu_prepare(struct amdgpu_vm_update_params *p, void *owner, 53 struct dma_fence *exclusive) 54{ 55 int r; 56 57 /* Wait for any BO move to be completed */ 58 if (exclusive) { 59 r = dma_fence_wait(exclusive, true); 60 if (unlikely(r)) 61 return r; 62 } 63 64 /* Don't wait for submissions during page fault */ 65 if (p->direct) 66 return 0; 67 68 /* Wait for PT BOs to be idle. PTs share the same resv. object 69 * as the root PD BO 70 */ 71 return amdgpu_bo_sync_wait(p->vm->root.base.bo, owner, true); 72} 73 74/** 75 * amdgpu_vm_cpu_update - helper to update page tables via CPU 76 * 77 * @p: see amdgpu_vm_update_params definition 78 * @bo: PD/PT to update 79 * @pe: kmap addr of the page entry 80 * @addr: dst addr to write into pe 81 * @count: number of page entries to update 82 * @incr: increase next addr by incr bytes 83 * @flags: hw access flags 84 * 85 * Write count number of PT/PD entries directly. 86 */ 87static int amdgpu_vm_cpu_update(struct amdgpu_vm_update_params *p, 88 struct amdgpu_bo *bo, uint64_t pe, 89 uint64_t addr, unsigned count, uint32_t incr, 90 uint64_t flags) 91{ 92 unsigned int i; 93 uint64_t value; 94 95 pe += (unsigned long)amdgpu_bo_kptr(bo); 96 97 trace_amdgpu_vm_set_ptes(pe, addr, count, incr, flags, p->direct); 98 99 for (i = 0; i < count; i++) { 100 value = p->pages_addr ? 101 amdgpu_vm_map_gart(p->pages_addr, addr) : 102 addr; 103 amdgpu_gmc_set_pte_pde(p->adev, (void *)(uintptr_t)pe, 104 i, value, flags); 105 addr += incr; 106 } 107 return 0; 108} 109 110/** 111 * amdgpu_vm_cpu_commit - commit page table update to the HW 112 * 113 * @p: see amdgpu_vm_update_params definition 114 * @fence: unused 115 * 116 * Make sure that the hardware sees the page table updates. 117 */ 118static int amdgpu_vm_cpu_commit(struct amdgpu_vm_update_params *p, 119 struct dma_fence **fence) 120{ 121 /* Flush HDP */ 122 mb(); 123 amdgpu_asic_flush_hdp(p->adev, NULL); 124 return 0; 125} 126 127const struct amdgpu_vm_update_funcs amdgpu_vm_cpu_funcs = { 128 .map_table = amdgpu_vm_cpu_map_table, 129 .prepare = amdgpu_vm_cpu_prepare, 130 .update = amdgpu_vm_cpu_update, 131 .commit = amdgpu_vm_cpu_commit 132}; 133