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      1 /*	$NetBSD: nouveau_vmm.c,v 1.2 2021/12/18 23:45:32 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2017 Red Hat 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 #include <sys/cdefs.h>
     25 __KERNEL_RCSID(0, "$NetBSD: nouveau_vmm.c,v 1.2 2021/12/18 23:45:32 riastradh Exp $");
     26 
     27 #include "nouveau_vmm.h"
     28 #include "nouveau_drv.h"
     29 #include "nouveau_bo.h"
     30 #include "nouveau_svm.h"
     31 #include "nouveau_mem.h"
     32 
     33 void
     34 nouveau_vma_unmap(struct nouveau_vma *vma)
     35 {
     36 	if (vma->mem) {
     37 		nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
     38 		vma->mem = NULL;
     39 	}
     40 }
     41 
     42 int
     43 nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
     44 {
     45 	struct nvif_vma tmp = { .addr = vma->addr };
     46 	int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
     47 	if (ret)
     48 		return ret;
     49 	vma->mem = mem;
     50 	return 0;
     51 }
     52 
     53 struct nouveau_vma *
     54 nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
     55 {
     56 	struct nouveau_vma *vma;
     57 
     58 	list_for_each_entry(vma, &nvbo->vma_list, head) {
     59 		if (vma->vmm == vmm)
     60 			return vma;
     61 	}
     62 
     63 	return NULL;
     64 }
     65 
     66 void
     67 nouveau_vma_del(struct nouveau_vma **pvma)
     68 {
     69 	struct nouveau_vma *vma = *pvma;
     70 	if (vma && --vma->refs <= 0) {
     71 		if (likely(vma->addr != ~0ULL)) {
     72 			struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
     73 			nvif_vmm_put(&vma->vmm->vmm, &tmp);
     74 		}
     75 		list_del(&vma->head);
     76 		kfree(*pvma);
     77 	}
     78 	*pvma = NULL;
     79 }
     80 
     81 int
     82 nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
     83 		struct nouveau_vma **pvma)
     84 {
     85 	struct nouveau_mem *mem = nouveau_mem(&nvbo->bo.mem);
     86 	struct nouveau_vma *vma;
     87 	struct nvif_vma tmp;
     88 	int ret;
     89 
     90 	if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
     91 		vma->refs++;
     92 		return 0;
     93 	}
     94 
     95 	if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
     96 		return -ENOMEM;
     97 	vma->vmm = vmm;
     98 	vma->refs = 1;
     99 	vma->addr = ~0ULL;
    100 	vma->mem = NULL;
    101 	vma->fence = NULL;
    102 	list_add_tail(&vma->head, &nvbo->vma_list);
    103 
    104 	if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM &&
    105 	    mem->mem.page == nvbo->page) {
    106 		ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
    107 				   mem->mem.size, &tmp);
    108 		if (ret)
    109 			goto done;
    110 
    111 		vma->addr = tmp.addr;
    112 		ret = nouveau_vma_map(vma, mem);
    113 	} else {
    114 		ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
    115 				   mem->mem.size, &tmp);
    116 		vma->addr = tmp.addr;
    117 	}
    118 
    119 done:
    120 	if (ret)
    121 		nouveau_vma_del(pvma);
    122 	return ret;
    123 }
    124 
    125 void
    126 nouveau_vmm_fini(struct nouveau_vmm *vmm)
    127 {
    128 	nouveau_svmm_fini(&vmm->svmm);
    129 	nvif_vmm_fini(&vmm->vmm);
    130 	vmm->cli = NULL;
    131 }
    132 
    133 int
    134 nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
    135 {
    136 	int ret = nvif_vmm_init(&cli->mmu, oclass, false, PAGE_SIZE, 0, NULL, 0,
    137 				&vmm->vmm);
    138 	if (ret)
    139 		return ret;
    140 
    141 	vmm->cli = cli;
    142 	return 0;
    143 }
    144