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1/*2 * Copyright (C) 2015 Red Hat, Inc.3 * All Rights Reserved.4 *5 * Permission is hereby granted, free of charge, to any person obtaining6 * a copy of this software and associated documentation files (the7 * "Software"), to deal in the Software without restriction, including8 * without limitation the rights to use, copy, modify, merge, publish,9 * distribute, sublicense, and/or sell copies of the Software, and to10 * permit persons to whom the Software is furnished to do so, subject to11 * the following conditions:12 *13 * The above copyright notice and this permission notice (including the14 * next paragraph) shall be included in all copies or substantial15 * portions of the Software.16 *17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.24 */25 26#include <linux/dma-mapping.h>27#include <linux/moduleparam.h>28 29#include "virtgpu_drv.h"30 31static int virtio_gpu_virglrenderer_workaround = 1;32module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);33 34int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)35{36 if (virtio_gpu_virglrenderer_workaround) {37 /*38 * Hack to avoid re-using resource IDs.39 *40 * virglrenderer versions up to (and including) 0.7.041 * can't deal with that. virglrenderer commit42 * "f91a9dd35715 Fix unlinking resources from hash43 * table." (Feb 2019) fixes the bug.44 */45 static atomic_t seqno = ATOMIC_INIT(0);46 int handle = atomic_inc_return(&seqno);47 *resid = handle + 1;48 } else {49 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);50 if (handle < 0)51 return handle;52 *resid = handle + 1;53 }54 return 0;55}56 57static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)58{59 if (!virtio_gpu_virglrenderer_workaround) {60 ida_free(&vgdev->resource_ida, id - 1);61 }62}63 64void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)65{66 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;67 68 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);69 if (virtio_gpu_is_shmem(bo)) {70 drm_gem_shmem_free(&bo->base);71 } else if (virtio_gpu_is_vram(bo)) {72 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);73 74 spin_lock(&vgdev->host_visible_lock);75 if (drm_mm_node_allocated(&vram->vram_node))76 drm_mm_remove_node(&vram->vram_node);77 78 spin_unlock(&vgdev->host_visible_lock);79 80 drm_gem_free_mmap_offset(&vram->base.base.base);81 drm_gem_object_release(&vram->base.base.base);82 kfree(vram);83 }84}85 86static void virtio_gpu_free_object(struct drm_gem_object *obj)87{88 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);89 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;90 91 if (bo->created) {92 virtio_gpu_cmd_unref_resource(vgdev, bo);93 virtio_gpu_notify(vgdev);94 /* completion handler calls virtio_gpu_cleanup_object() */95 return;96 }97 virtio_gpu_cleanup_object(bo);98}99 100static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {101 .free = virtio_gpu_free_object,102 .open = virtio_gpu_gem_object_open,103 .close = virtio_gpu_gem_object_close,104 .print_info = drm_gem_shmem_object_print_info,105 .export = virtgpu_gem_prime_export,106 .pin = drm_gem_shmem_object_pin,107 .unpin = drm_gem_shmem_object_unpin,108 .get_sg_table = drm_gem_shmem_object_get_sg_table,109 .vmap = drm_gem_shmem_object_vmap,110 .vunmap = drm_gem_shmem_object_vunmap,111 .mmap = drm_gem_shmem_object_mmap,112 .vm_ops = &drm_gem_shmem_vm_ops,113};114 115bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)116{117 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;118}119 120struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,121 size_t size)122{123 struct virtio_gpu_object_shmem *shmem;124 struct drm_gem_shmem_object *dshmem;125 126 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);127 if (!shmem)128 return ERR_PTR(-ENOMEM);129 130 dshmem = &shmem->base.base;131 dshmem->base.funcs = &virtio_gpu_shmem_funcs;132 return &dshmem->base;133}134 135static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,136 struct virtio_gpu_object *bo,137 struct virtio_gpu_mem_entry **ents,138 unsigned int *nents)139{140 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);141 struct scatterlist *sg;142 struct sg_table *pages;143 int si;144 145 pages = drm_gem_shmem_get_pages_sgt(&bo->base);146 if (IS_ERR(pages))147 return PTR_ERR(pages);148 149 if (use_dma_api)150 *nents = pages->nents;151 else152 *nents = pages->orig_nents;153 154 *ents = kvmalloc_array(*nents,155 sizeof(struct virtio_gpu_mem_entry),156 GFP_KERNEL);157 if (!(*ents)) {158 DRM_ERROR("failed to allocate ent list\n");159 return -ENOMEM;160 }161 162 if (use_dma_api) {163 for_each_sgtable_dma_sg(pages, sg, si) {164 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));165 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));166 (*ents)[si].padding = 0;167 }168 } else {169 for_each_sgtable_sg(pages, sg, si) {170 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));171 (*ents)[si].length = cpu_to_le32(sg->length);172 (*ents)[si].padding = 0;173 }174 }175 176 return 0;177}178 179int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,180 struct virtio_gpu_object_params *params,181 struct virtio_gpu_object **bo_ptr,182 struct virtio_gpu_fence *fence)183{184 struct virtio_gpu_object_array *objs = NULL;185 struct drm_gem_shmem_object *shmem_obj;186 struct virtio_gpu_object *bo;187 struct virtio_gpu_mem_entry *ents = NULL;188 unsigned int nents;189 int ret;190 191 *bo_ptr = NULL;192 193 params->size = roundup(params->size, PAGE_SIZE);194 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);195 if (IS_ERR(shmem_obj))196 return PTR_ERR(shmem_obj);197 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);198 199 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);200 if (ret < 0)201 goto err_free_gem;202 203 bo->dumb = params->dumb;204 205 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);206 if (ret != 0)207 goto err_put_id;208 209 if (fence) {210 ret = -ENOMEM;211 objs = virtio_gpu_array_alloc(1);212 if (!objs)213 goto err_free_entry;214 virtio_gpu_array_add_obj(objs, &bo->base.base);215 216 ret = virtio_gpu_array_lock_resv(objs);217 if (ret != 0)218 goto err_put_objs;219 }220 221 if (params->blob) {222 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)223 bo->guest_blob = true;224 225 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,226 ents, nents);227 } else if (params->virgl) {228 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,229 objs, fence);230 virtio_gpu_object_attach(vgdev, bo, ents, nents);231 } else {232 virtio_gpu_cmd_create_resource(vgdev, bo, params,233 objs, fence);234 virtio_gpu_object_attach(vgdev, bo, ents, nents);235 }236 237 *bo_ptr = bo;238 return 0;239 240err_put_objs:241 virtio_gpu_array_put_free(objs);242err_free_entry:243 kvfree(ents);244err_put_id:245 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);246err_free_gem:247 drm_gem_shmem_free(shmem_obj);248 return ret;249}250