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      1 /*	$NetBSD: amdgpu_csa.c,v 1.3 2021/12/19 10:59:01 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2016 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  * * Author: Monk.liu (at) amd.com
     25  */
     26 
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: amdgpu_csa.c,v 1.3 2021/12/19 10:59:01 riastradh Exp $");
     29 
     30 #include "amdgpu.h"
     31 
     32 uint64_t amdgpu_csa_vaddr(struct amdgpu_device *adev)
     33 {
     34 	uint64_t addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
     35 
     36 	addr -= AMDGPU_VA_RESERVED_SIZE;
     37 	addr = amdgpu_gmc_sign_extend(addr);
     38 
     39 	return addr;
     40 }
     41 
     42 int amdgpu_allocate_static_csa(struct amdgpu_device *adev, struct amdgpu_bo **bo,
     43 				u32 domain, uint32_t size)
     44 {
     45 	int r __unused;
     46 	void *ptr;
     47 
     48 	r = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
     49 				domain, bo,
     50 				NULL, &ptr);
     51 	if (!*bo)
     52 		return -ENOMEM;
     53 
     54 	memset(ptr, 0, size);
     55 	adev->virt.csa_cpu_addr = ptr;
     56 	return 0;
     57 }
     58 
     59 void amdgpu_free_static_csa(struct amdgpu_bo **bo)
     60 {
     61 	amdgpu_bo_free_kernel(bo, NULL, NULL);
     62 }
     63 
     64 /*
     65  * amdgpu_map_static_csa should be called during amdgpu_vm_init
     66  * it maps virtual address amdgpu_csa_vaddr() to this VM, and each command
     67  * submission of GFX should use this virtual address within META_DATA init
     68  * package to support SRIOV gfx preemption.
     69  */
     70 int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm,
     71 			  struct amdgpu_bo *bo, struct amdgpu_bo_va **bo_va,
     72 			  uint64_t csa_addr, uint32_t size)
     73 {
     74 	struct ww_acquire_ctx ticket;
     75 	struct list_head list;
     76 	struct amdgpu_bo_list_entry pd;
     77 	struct ttm_validate_buffer csa_tv;
     78 	int r;
     79 
     80 	INIT_LIST_HEAD(&list);
     81 	INIT_LIST_HEAD(&csa_tv.head);
     82 	csa_tv.bo = &bo->tbo;
     83 	csa_tv.num_shared = 1;
     84 
     85 	list_add(&csa_tv.head, &list);
     86 	amdgpu_vm_get_pd_bo(vm, &list, &pd);
     87 
     88 	r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL);
     89 	if (r) {
     90 		DRM_ERROR("failed to reserve CSA,PD BOs: err=%d\n", r);
     91 		return r;
     92 	}
     93 
     94 	*bo_va = amdgpu_vm_bo_add(adev, vm, bo);
     95 	if (!*bo_va) {
     96 		ttm_eu_backoff_reservation(&ticket, &list);
     97 		DRM_ERROR("failed to create bo_va for static CSA\n");
     98 		return -ENOMEM;
     99 	}
    100 
    101 	r = amdgpu_vm_bo_map(adev, *bo_va, csa_addr, 0, size,
    102 			     AMDGPU_PTE_READABLE | AMDGPU_PTE_WRITEABLE |
    103 			     AMDGPU_PTE_EXECUTABLE);
    104 
    105 	if (r) {
    106 		DRM_ERROR("failed to do bo_map on static CSA, err=%d\n", r);
    107 		amdgpu_vm_bo_rmv(adev, *bo_va);
    108 		ttm_eu_backoff_reservation(&ticket, &list);
    109 		return r;
    110 	}
    111 
    112 	ttm_eu_backoff_reservation(&ticket, &list);
    113 	return 0;
    114 }
    115