drm/virtio/virtgpu_object.c

0001 /*
0002  * Copyright (C) 2015 Red Hat, Inc.
0003  * All Rights Reserved.
0004  *
0005  * Permission is hereby granted, free of charge, to any person obtaining
0006  * a copy of this software and associated documentation files (the
0007  * "Software"), to deal in the Software without restriction, including
0008  * without limitation the rights to use, copy, modify, merge, publish,
0009  * distribute, sublicense, and/or sell copies of the Software, and to
0010  * permit persons to whom the Software is furnished to do so, subject to
0011  * the following conditions:
0012  *
0013  * The above copyright notice and this permission notice (including the
0014  * next paragraph) shall be included in all copies or substantial
0015  * portions of the Software.
0016  *
0017  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0018  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0019  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
0020  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
0021  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
0022  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
0023  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
0024  */
0025
0026 #include <linux/dma-mapping.h>
0027 #include <linux/moduleparam.h>
0028
0029 #include "virtgpu_drv.h"
0030
0031 static int virtio_gpu_virglrenderer_workaround = 1;
0032 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
0033
0034 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
0035 {
0036     if (virtio_gpu_virglrenderer_workaround) {
0037         /*
0038          * Hack to avoid re-using resource IDs.
0039          *
0040          * virglrenderer versions up to (and including) 0.7.0
0041          * can't deal with that.  virglrenderer commit
0042          * "f91a9dd35715 Fix unlinking resources from hash
0043          * table." (Feb 2019) fixes the bug.
0044          */
0045         static atomic_t seqno = ATOMIC_INIT(0);
0046         int handle = atomic_inc_return(&seqno);
0047         *resid = handle + 1;
0048     } else {
0049         int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
0050         if (handle < 0)
0051             return handle;
0052         *resid = handle + 1;
0053     }
0054     return 0;
0055 }
0056
0057 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
0058 {
0059     if (!virtio_gpu_virglrenderer_workaround) {
0060         ida_free(&vgdev->resource_ida, id - 1);
0061     }
0062 }
0063
0064 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
0065 {
0066     struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
0067
0068     virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
0069     if (virtio_gpu_is_shmem(bo)) {
0070         struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
0071
0072         if (shmem->pages) {
0073             if (shmem->mapped) {
0074                 dma_unmap_sgtable(vgdev->vdev->dev.parent,
0075                          shmem->pages, DMA_TO_DEVICE, 0);
0076                 shmem->mapped = 0;
0077             }
0078
0079             sg_free_table(shmem->pages);
0080             kfree(shmem->pages);
0081             shmem->pages = NULL;
0082             drm_gem_shmem_unpin(&bo->base);
0083         }
0084
0085         drm_gem_shmem_free(&bo->base);
0086     } else if (virtio_gpu_is_vram(bo)) {
0087         struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
0088
0089         spin_lock(&vgdev->host_visible_lock);
0090         if (drm_mm_node_allocated(&vram->vram_node))
0091             drm_mm_remove_node(&vram->vram_node);
0092
0093         spin_unlock(&vgdev->host_visible_lock);
0094
0095         drm_gem_free_mmap_offset(&vram->base.base.base);
0096         drm_gem_object_release(&vram->base.base.base);
0097         kfree(vram);
0098     }
0099 }
0100
0101 static void virtio_gpu_free_object(struct drm_gem_object *obj)
0102 {
0103     struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
0104     struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
0105
0106     if (bo->created) {
0107         virtio_gpu_cmd_unref_resource(vgdev, bo);
0108         virtio_gpu_notify(vgdev);
0109         /* completion handler calls virtio_gpu_cleanup_object() */
0110         return;
0111     }
0112     virtio_gpu_cleanup_object(bo);
0113 }
0114
0115 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
0116     .free = virtio_gpu_free_object,
0117     .open = virtio_gpu_gem_object_open,
0118     .close = virtio_gpu_gem_object_close,
0119     .print_info = drm_gem_shmem_object_print_info,
0120     .export = virtgpu_gem_prime_export,
0121     .pin = drm_gem_shmem_object_pin,
0122     .unpin = drm_gem_shmem_object_unpin,
0123     .get_sg_table = drm_gem_shmem_object_get_sg_table,
0124     .vmap = drm_gem_shmem_object_vmap,
0125     .vunmap = drm_gem_shmem_object_vunmap,
0126     .mmap = drm_gem_shmem_object_mmap,
0127     .vm_ops = &drm_gem_shmem_vm_ops,
0128 };
0129
0130 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
0131 {
0132     return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
0133 }
0134
0135 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
0136                         size_t size)
0137 {
0138     struct virtio_gpu_object_shmem *shmem;
0139     struct drm_gem_shmem_object *dshmem;
0140
0141     shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
0142     if (!shmem)
0143         return ERR_PTR(-ENOMEM);
0144
0145     dshmem = &shmem->base.base;
0146     dshmem->base.funcs = &virtio_gpu_shmem_funcs;
0147     return &dshmem->base;
0148 }
0149
0150 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
0151                     struct virtio_gpu_object *bo,
0152                     struct virtio_gpu_mem_entry **ents,
0153                     unsigned int *nents)
0154 {
0155     bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
0156     struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
0157     struct scatterlist *sg;
0158     int si, ret;
0159
0160     ret = drm_gem_shmem_pin(&bo->base);
0161     if (ret < 0)
0162         return -EINVAL;
0163
0164     /*
0165      * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
0166      * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
0167      * dma-ops. This is discouraged for other drivers, but should be fine
0168      * since virtio_gpu doesn't support dma-buf import from other devices.
0169      */
0170     shmem->pages = drm_gem_shmem_get_sg_table(&bo->base);
0171     if (IS_ERR(shmem->pages)) {
0172         drm_gem_shmem_unpin(&bo->base);
0173         return PTR_ERR(shmem->pages);
0174     }
0175
0176     if (use_dma_api) {
0177         ret = dma_map_sgtable(vgdev->vdev->dev.parent,
0178                       shmem->pages, DMA_TO_DEVICE, 0);
0179         if (ret)
0180             return ret;
0181         *nents = shmem->mapped = shmem->pages->nents;
0182     } else {
0183         *nents = shmem->pages->orig_nents;
0184     }
0185
0186     *ents = kvmalloc_array(*nents,
0187                    sizeof(struct virtio_gpu_mem_entry),
0188                    GFP_KERNEL);
0189     if (!(*ents)) {
0190         DRM_ERROR("failed to allocate ent list\n");
0191         return -ENOMEM;
0192     }
0193
0194     if (use_dma_api) {
0195         for_each_sgtable_dma_sg(shmem->pages, sg, si) {
0196             (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
0197             (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
0198             (*ents)[si].padding = 0;
0199         }
0200     } else {
0201         for_each_sgtable_sg(shmem->pages, sg, si) {
0202             (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
0203             (*ents)[si].length = cpu_to_le32(sg->length);
0204             (*ents)[si].padding = 0;
0205         }
0206     }
0207
0208     return 0;
0209 }
0210
0211 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
0212                  struct virtio_gpu_object_params *params,
0213                  struct virtio_gpu_object **bo_ptr,
0214                  struct virtio_gpu_fence *fence)
0215 {
0216     struct virtio_gpu_object_array *objs = NULL;
0217     struct drm_gem_shmem_object *shmem_obj;
0218     struct virtio_gpu_object *bo;
0219     struct virtio_gpu_mem_entry *ents;
0220     unsigned int nents;
0221     int ret;
0222
0223     *bo_ptr = NULL;
0224
0225     params->size = roundup(params->size, PAGE_SIZE);
0226     shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
0227     if (IS_ERR(shmem_obj))
0228         return PTR_ERR(shmem_obj);
0229     bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
0230
0231     ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
0232     if (ret < 0)
0233         goto err_free_gem;
0234
0235     bo->dumb = params->dumb;
0236
0237     if (fence) {
0238         ret = -ENOMEM;
0239         objs = virtio_gpu_array_alloc(1);
0240         if (!objs)
0241             goto err_put_id;
0242         virtio_gpu_array_add_obj(objs, &bo->base.base);
0243
0244         ret = virtio_gpu_array_lock_resv(objs);
0245         if (ret != 0)
0246             goto err_put_objs;
0247     }
0248
0249     ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
0250     if (ret != 0) {
0251         virtio_gpu_array_put_free(objs);
0252         virtio_gpu_free_object(&shmem_obj->base);
0253         return ret;
0254     }
0255
0256     if (params->blob) {
0257         if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
0258             bo->guest_blob = true;
0259
0260         virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
0261                             ents, nents);
0262     } else if (params->virgl) {
0263         virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
0264                           objs, fence);
0265         virtio_gpu_object_attach(vgdev, bo, ents, nents);
0266     } else {
0267         virtio_gpu_cmd_create_resource(vgdev, bo, params,
0268                            objs, fence);
0269         virtio_gpu_object_attach(vgdev, bo, ents, nents);
0270     }
0271
0272     *bo_ptr = bo;
0273     return 0;
0274
0275 err_put_objs:
0276     virtio_gpu_array_put_free(objs);
0277 err_put_id:
0278     virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
0279 err_free_gem:
0280     drm_gem_shmem_free(shmem_obj);
0281     return ret;
0282 }