cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

amdgpu_csa.c (3242B)

      1/*
      2 * Copyright 2016 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 * * Author: Monk.liu@amd.com
     23 */
     24
     25#include "amdgpu.h"
     26
     27uint64_t amdgpu_csa_vaddr(struct amdgpu_device *adev)
     28{
     29	uint64_t addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
     30
     31	addr -= AMDGPU_VA_RESERVED_SIZE;
     32	addr = amdgpu_gmc_sign_extend(addr);
     33
     34	return addr;
     35}
     36
     37int amdgpu_allocate_static_csa(struct amdgpu_device *adev, struct amdgpu_bo **bo,
     38				u32 domain, uint32_t size)
     39{
     40	void *ptr;
     41
     42	amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
     43				domain, bo,
     44				NULL, &ptr);
     45	if (!*bo)
     46		return -ENOMEM;
     47
     48	memset(ptr, 0, size);
     49	adev->virt.csa_cpu_addr = ptr;
     50	return 0;
     51}
     52
     53void amdgpu_free_static_csa(struct amdgpu_bo **bo)
     54{
     55	amdgpu_bo_free_kernel(bo, NULL, NULL);
     56}
     57
     58/*
     59 * amdgpu_map_static_csa should be called during amdgpu_vm_init
     60 * it maps virtual address amdgpu_csa_vaddr() to this VM, and each command
     61 * submission of GFX should use this virtual address within META_DATA init
     62 * package to support SRIOV gfx preemption.
     63 */
     64int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm,
     65			  struct amdgpu_bo *bo, struct amdgpu_bo_va **bo_va,
     66			  uint64_t csa_addr, uint32_t size)
     67{
     68	struct ww_acquire_ctx ticket;
     69	struct list_head list;
     70	struct amdgpu_bo_list_entry pd;
     71	struct ttm_validate_buffer csa_tv;
     72	int r;
     73
     74	INIT_LIST_HEAD(&list);
     75	INIT_LIST_HEAD(&csa_tv.head);
     76	csa_tv.bo = &bo->tbo;
     77	csa_tv.num_shared = 1;
     78
     79	list_add(&csa_tv.head, &list);
     80	amdgpu_vm_get_pd_bo(vm, &list, &pd);
     81
     82	r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL);
     83	if (r) {
     84		DRM_ERROR("failed to reserve CSA,PD BOs: err=%d\n", r);
     85		return r;
     86	}
     87
     88	*bo_va = amdgpu_vm_bo_add(adev, vm, bo);
     89	if (!*bo_va) {
     90		ttm_eu_backoff_reservation(&ticket, &list);
     91		DRM_ERROR("failed to create bo_va for static CSA\n");
     92		return -ENOMEM;
     93	}
     94
     95	r = amdgpu_vm_bo_map(adev, *bo_va, csa_addr, 0, size,
     96			     AMDGPU_PTE_READABLE | AMDGPU_PTE_WRITEABLE |
     97			     AMDGPU_PTE_EXECUTABLE);
     98
     99	if (r) {
    100		DRM_ERROR("failed to do bo_map on static CSA, err=%d\n", r);
    101		amdgpu_vm_bo_del(adev, *bo_va);
    102		ttm_eu_backoff_reservation(&ticket, &list);
    103		return r;
    104	}
    105
    106	ttm_eu_backoff_reservation(&ticket, &list);
    107	return 0;
    108}