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      1 /*	$NetBSD: nouveau_nvif_vmm.c,v 1.2 2021/12/18 23:45:33 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_nvif_vmm.c,v 1.2 2021/12/18 23:45:33 riastradh Exp $");
     26 
     27 #include <nvif/vmm.h>
     28 #include <nvif/mem.h>
     29 
     30 #include <nvif/if000c.h>
     31 
     32 int
     33 nvif_vmm_unmap(struct nvif_vmm *vmm, u64 addr)
     34 {
     35 	return nvif_object_mthd(&vmm->object, NVIF_VMM_V0_UNMAP,
     36 				&(struct nvif_vmm_unmap_v0) { .addr = addr },
     37 				sizeof(struct nvif_vmm_unmap_v0));
     38 }
     39 
     40 int
     41 nvif_vmm_map(struct nvif_vmm *vmm, u64 addr, u64 size, void *argv, u32 argc,
     42 	     struct nvif_mem *mem, u64 offset)
     43 {
     44 	struct nvif_vmm_map_v0 *args;
     45 	u8 stack[48];
     46 	int ret;
     47 
     48 	if (sizeof(*args) + argc > sizeof(stack)) {
     49 		if (!(args = kmalloc(sizeof(*args) + argc, GFP_KERNEL)))
     50 			return -ENOMEM;
     51 	} else {
     52 		args = (void *)stack;
     53 	}
     54 
     55 	args->version = 0;
     56 	args->addr = addr;
     57 	args->size = size;
     58 	args->memory = nvif_handle(&mem->object);
     59 	args->offset = offset;
     60 	memcpy(args->data, argv, argc);
     61 
     62 	ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_MAP,
     63 			       args, sizeof(*args) + argc);
     64 	if (args != (void *)stack)
     65 		kfree(args);
     66 	return ret;
     67 }
     68 
     69 void
     70 nvif_vmm_put(struct nvif_vmm *vmm, struct nvif_vma *vma)
     71 {
     72 	if (vma->size) {
     73 		WARN_ON(nvif_object_mthd(&vmm->object, NVIF_VMM_V0_PUT,
     74 					 &(struct nvif_vmm_put_v0) {
     75 						.addr = vma->addr,
     76 					 }, sizeof(struct nvif_vmm_put_v0)));
     77 		vma->size = 0;
     78 	}
     79 }
     80 
     81 int
     82 nvif_vmm_get(struct nvif_vmm *vmm, enum nvif_vmm_get type, bool sparse,
     83 	     u8 page, u8 align, u64 size, struct nvif_vma *vma)
     84 {
     85 	struct nvif_vmm_get_v0 args;
     86 	int ret;
     87 
     88 	args.version = vma->size = 0;
     89 	args.sparse = sparse;
     90 	args.page = page;
     91 	args.align = align;
     92 	args.size = size;
     93 
     94 	switch (type) {
     95 	case ADDR: args.type = NVIF_VMM_GET_V0_ADDR; break;
     96 	case PTES: args.type = NVIF_VMM_GET_V0_PTES; break;
     97 	case LAZY: args.type = NVIF_VMM_GET_V0_LAZY; break;
     98 	default:
     99 		WARN_ON(1);
    100 		return -EINVAL;
    101 	}
    102 
    103 	ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_GET,
    104 			       &args, sizeof(args));
    105 	if (ret == 0) {
    106 		vma->addr = args.addr;
    107 		vma->size = args.size;
    108 	}
    109 	return ret;
    110 }
    111 
    112 void
    113 nvif_vmm_fini(struct nvif_vmm *vmm)
    114 {
    115 	kfree(vmm->page);
    116 	nvif_object_fini(&vmm->object);
    117 }
    118 
    119 int
    120 nvif_vmm_init(struct nvif_mmu *mmu, s32 oclass, bool managed, u64 addr,
    121 	      u64 size, void *argv, u32 argc, struct nvif_vmm *vmm)
    122 {
    123 	struct nvif_vmm_v0 *args;
    124 	u32 argn = sizeof(*args) + argc;
    125 	int ret = -ENOSYS, i;
    126 
    127 	vmm->object.client = NULL;
    128 	vmm->page = NULL;
    129 
    130 	if (!(args = kmalloc(argn, GFP_KERNEL)))
    131 		return -ENOMEM;
    132 	args->version = 0;
    133 	args->managed = managed;
    134 	args->addr = addr;
    135 	args->size = size;
    136 	memcpy(args->data, argv, argc);
    137 
    138 	ret = nvif_object_init(&mmu->object, 0, oclass, args, argn,
    139 			       &vmm->object);
    140 	if (ret)
    141 		goto done;
    142 
    143 	vmm->start = args->addr;
    144 	vmm->limit = args->size;
    145 
    146 	vmm->page_nr = args->page_nr;
    147 	vmm->page = kmalloc_array(vmm->page_nr, sizeof(*vmm->page),
    148 				  GFP_KERNEL);
    149 	if (!vmm->page) {
    150 		ret = -ENOMEM;
    151 		goto done;
    152 	}
    153 
    154 	for (i = 0; i < vmm->page_nr; i++) {
    155 		struct nvif_vmm_page_v0 args = { .index = i };
    156 
    157 		ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_PAGE,
    158 				       &args, sizeof(args));
    159 		if (ret)
    160 			break;
    161 
    162 		vmm->page[i].shift = args.shift;
    163 		vmm->page[i].sparse = args.sparse;
    164 		vmm->page[i].vram = args.vram;
    165 		vmm->page[i].host = args.host;
    166 		vmm->page[i].comp = args.comp;
    167 	}
    168 
    169 done:
    170 	if (ret)
    171 		nvif_vmm_fini(vmm);
    172 	kfree(args);
    173 	return ret;
    174 }
    175