1 files changed, 249 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
new file mode 100644
index 000000000..c7e74cf13
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/moduleparam.h>
+
+#include "virtgpu_drv.h"
+
+static int virtio_gpu_virglrenderer_workaround = 1;
+module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
+
+int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
+{
+	if (virtio_gpu_virglrenderer_workaround) {
+		/*
+		 * Hack to avoid re-using resource IDs.
+		 *
+		 * virglrenderer versions up to (and including) 0.7.0
+		 * can't deal with that.  virglrenderer commit
+		 * "f91a9dd35715 Fix unlinking resources from hash
+		 * table." (Feb 2019) fixes the bug.
+		 */
+		static atomic_t seqno = ATOMIC_INIT(0);
+		int handle = atomic_inc_return(&seqno);
+		*resid = handle + 1;
+	} else {
+		int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
+		if (handle < 0)
+			return handle;
+		*resid = handle + 1;
+	}
+	return 0;
+}
+
+static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
+{
+	if (!virtio_gpu_virglrenderer_workaround) {
+		ida_free(&vgdev->resource_ida, id - 1);
+	}
+}
+
+void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
+{
+	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
+
+	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
+	if (virtio_gpu_is_shmem(bo)) {
+		drm_gem_shmem_free(&bo->base);
+	} else if (virtio_gpu_is_vram(bo)) {
+		struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
+
+		spin_lock(&vgdev->host_visible_lock);
+		if (drm_mm_node_allocated(&vram->vram_node))
+			drm_mm_remove_node(&vram->vram_node);
+
+		spin_unlock(&vgdev->host_visible_lock);
+
+		drm_gem_free_mmap_offset(&vram->base.base.base);
+		drm_gem_object_release(&vram->base.base.base);
+		kfree(vram);
+	}
+}
+
+static void virtio_gpu_free_object(struct drm_gem_object *obj)
+{
+	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
+
+	if (bo->created) {
+		virtio_gpu_cmd_unref_resource(vgdev, bo);
+		virtio_gpu_notify(vgdev);
+		/* completion handler calls virtio_gpu_cleanup_object() */
+		return;
+	}
+	virtio_gpu_cleanup_object(bo);
+}
+
+static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
+	.free = virtio_gpu_free_object,
+	.open = virtio_gpu_gem_object_open,
+	.close = virtio_gpu_gem_object_close,
+	.print_info = drm_gem_shmem_object_print_info,
+	.export = virtgpu_gem_prime_export,
+	.pin = drm_gem_shmem_object_pin,
+	.unpin = drm_gem_shmem_object_unpin,
+	.get_sg_table = drm_gem_shmem_object_get_sg_table,
+	.vmap = drm_gem_shmem_object_vmap,
+	.vunmap = drm_gem_shmem_object_vunmap,
+	.mmap = drm_gem_shmem_object_mmap,
+	.vm_ops = &drm_gem_shmem_vm_ops,
+};
+
+bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
+{
+	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
+}
+
+struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
+						size_t size)
+{
+	struct virtio_gpu_object_shmem *shmem;
+	struct drm_gem_shmem_object *dshmem;
+
+	shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
+	if (!shmem)
+		return ERR_PTR(-ENOMEM);
+
+	dshmem = &shmem->base.base;
+	dshmem->base.funcs = &virtio_gpu_shmem_funcs;
+	return &dshmem->base;
+}
+
+static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
+					struct virtio_gpu_object *bo,
+					struct virtio_gpu_mem_entry **ents,
+					unsigned int *nents)
+{
+	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
+	struct scatterlist *sg;
+	struct sg_table *pages;
+	int si;
+
+	pages = drm_gem_shmem_get_pages_sgt(&bo->base);
+	if (IS_ERR(pages))
+		return PTR_ERR(pages);
+
+	if (use_dma_api)
+		*nents = pages->nents;
+	else
+		*nents = pages->orig_nents;
+
+	*ents = kvmalloc_array(*nents,
+			       sizeof(struct virtio_gpu_mem_entry),
+			       GFP_KERNEL);
+	if (!(*ents)) {
+		DRM_ERROR("failed to allocate ent list\n");
+		return -ENOMEM;
+	}
+
+	if (use_dma_api) {
+		for_each_sgtable_dma_sg(pages, sg, si) {
+			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
+			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
+			(*ents)[si].padding = 0;
+		}
+	} else {
+		for_each_sgtable_sg(pages, sg, si) {
+			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));
+			(*ents)[si].length = cpu_to_le32(sg->length);
+			(*ents)[si].padding = 0;
+		}
+	}
+
+	return 0;
+}
+
+int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
+			     struct virtio_gpu_object_params *params,
+			     struct virtio_gpu_object **bo_ptr,
+			     struct virtio_gpu_fence *fence)
+{
+	struct virtio_gpu_object_array *objs = NULL;
+	struct drm_gem_shmem_object *shmem_obj;
+	struct virtio_gpu_object *bo;
+	struct virtio_gpu_mem_entry *ents = NULL;
+	unsigned int nents;
+	int ret;
+
+	*bo_ptr = NULL;
+
+	params->size = roundup(params->size, PAGE_SIZE);
+	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
+	if (IS_ERR(shmem_obj))
+		return PTR_ERR(shmem_obj);
+	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
+
+	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
+	if (ret < 0)
+		goto err_free_gem;
+
+	bo->dumb = params->dumb;
+
+	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
+	if (ret != 0)
+		goto err_put_id;
+
+	if (fence) {
+		ret = -ENOMEM;
+		objs = virtio_gpu_array_alloc(1);
+		if (!objs)
+			goto err_free_entry;
+		virtio_gpu_array_add_obj(objs, &bo->base.base);
+
+		ret = virtio_gpu_array_lock_resv(objs);
+		if (ret != 0)
+			goto err_put_objs;
+	}
+
+	if (params->blob) {
+		if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
+			bo->guest_blob = true;
+
+		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
+						    ents, nents);
+	} else if (params->virgl) {
+		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
+						  objs, fence);
+		virtio_gpu_object_attach(vgdev, bo, ents, nents);
+	} else {
+		virtio_gpu_cmd_create_resource(vgdev, bo, params,
+					       objs, fence);
+		virtio_gpu_object_attach(vgdev, bo, ents, nents);
+	}
+
+	*bo_ptr = bo;
+	return 0;
+
+err_put_objs:
+	virtio_gpu_array_put_free(objs);
+err_free_entry:
+	kvfree(ents);
+err_put_id:
+	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
+err_free_gem:
+	drm_gem_shmem_free(shmem_obj);
+	return ret;
+}