DRM API requires the DRM's driver to be backed with the device that can be used for generic DMA operations. The VirtIO-GPU device can't perform DMA operations if it uses PCI transport because PCI device driver creates a virtual VirtIO-GPU device that isn't associated with the PCI. Use PCI's GPU device for the DRM's device instead of the VirtIO-GPU device and drop DMA-related hacks from the VirtIO-GPU driver.
Signed-off-by: Dmitry Osipenko dmitry.osipenko@collabora.com --- drivers/gpu/drm/virtio/virtgpu_drv.c | 22 +++++++--- drivers/gpu/drm/virtio/virtgpu_drv.h | 5 +-- drivers/gpu/drm/virtio/virtgpu_kms.c | 7 ++-- drivers/gpu/drm/virtio/virtgpu_object.c | 56 +++++-------------------- drivers/gpu/drm/virtio/virtgpu_vq.c | 13 +++--- 5 files changed, 37 insertions(+), 66 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c index 5f25a8d15464..8449dad3e65c 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.c +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c @@ -46,9 +46,9 @@ static int virtio_gpu_modeset = -1; MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); module_param_named(modeset, virtio_gpu_modeset, int, 0400);
-static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) +static int virtio_gpu_pci_quirk(struct drm_device *dev) { - struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); + struct pci_dev *pdev = to_pci_dev(dev->dev); const char *pname = dev_name(&pdev->dev); bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; char unique[20]; @@ -101,6 +101,7 @@ static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vd static int virtio_gpu_probe(struct virtio_device *vdev) { struct drm_device *dev; + struct device *dma_dev; int ret;
if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) @@ -109,18 +110,29 @@ static int virtio_gpu_probe(struct virtio_device *vdev) if (virtio_gpu_modeset == 0) return -EINVAL;
- dev = drm_dev_alloc(&driver, &vdev->dev); + /* + * If GPU's parent is a PCI device, then we will use this PCI device + * for the DRM's driver device because GPU won't have PCI's IOMMU DMA + * ops in this case since GPU device is sitting on a separate (from PCI) + * virtio-bus. + */ + if (!strcmp(vdev->dev.parent->bus->name, "pci")) + dma_dev = vdev->dev.parent; + else + dma_dev = &vdev->dev; + + dev = drm_dev_alloc(&driver, dma_dev); if (IS_ERR(dev)) return PTR_ERR(dev); vdev->priv = dev;
if (!strcmp(vdev->dev.parent->bus->name, "pci")) { - ret = virtio_gpu_pci_quirk(dev, vdev); + ret = virtio_gpu_pci_quirk(dev); if (ret) goto err_free; }
- ret = virtio_gpu_init(dev); + ret = virtio_gpu_init(vdev, dev); if (ret) goto err_free;
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h index 0a194aaad419..b2d93cb12ebf 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -100,8 +100,6 @@ struct virtio_gpu_object {
struct virtio_gpu_object_shmem { struct virtio_gpu_object base; - struct sg_table *pages; - uint32_t mapped; };
struct virtio_gpu_object_vram { @@ -214,7 +212,6 @@ struct virtio_gpu_drv_cap_cache { };
struct virtio_gpu_device { - struct device *dev; struct drm_device *ddev;
struct virtio_device *vdev; @@ -282,7 +279,7 @@ extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS]; void virtio_gpu_create_context(struct drm_device *dev, struct drm_file *file);
/* virtgpu_kms.c */ -int virtio_gpu_init(struct drm_device *dev); +int virtio_gpu_init(struct virtio_device *vdev, struct drm_device *dev); void virtio_gpu_deinit(struct drm_device *dev); void virtio_gpu_release(struct drm_device *dev); int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file); diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c index 3313b92db531..0d1e3eb61bee 100644 --- a/drivers/gpu/drm/virtio/virtgpu_kms.c +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c @@ -110,7 +110,7 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev, vgdev->num_capsets = num_capsets; }
-int virtio_gpu_init(struct drm_device *dev) +int virtio_gpu_init(struct virtio_device *vdev, struct drm_device *dev) { static vq_callback_t *callbacks[] = { virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack @@ -123,7 +123,7 @@ int virtio_gpu_init(struct drm_device *dev) u32 num_scanouts, num_capsets; int ret = 0;
- if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1)) + if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) return -ENODEV;
vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL); @@ -132,8 +132,7 @@ int virtio_gpu_init(struct drm_device *dev)
vgdev->ddev = dev; dev->dev_private = vgdev; - vgdev->vdev = dev_to_virtio(dev->dev); - vgdev->dev = dev->dev; + vgdev->vdev = vdev;
spin_lock_init(&vgdev->display_info_lock); spin_lock_init(&vgdev->resource_export_lock); diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index 0b8cbb87f8d8..1964c0d8b51f 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -67,21 +67,6 @@ void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); if (virtio_gpu_is_shmem(bo)) { - struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); - - if (shmem->pages) { - if (shmem->mapped) { - dma_unmap_sgtable(vgdev->vdev->dev.parent, - shmem->pages, DMA_TO_DEVICE, 0); - shmem->mapped = 0; - } - - sg_free_table(shmem->pages); - kfree(shmem->pages); - shmem->pages = NULL; - drm_gem_shmem_unpin(&bo->base); - } - drm_gem_shmem_free(&bo->base); } else if (virtio_gpu_is_vram(bo)) { struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); @@ -153,37 +138,18 @@ static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, unsigned int *nents) { bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev); - struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); struct scatterlist *sg; - int si, ret; + struct sg_table *pages; + int si;
- ret = drm_gem_shmem_pin(&bo->base); - if (ret < 0) - return -EINVAL; - - /* - * virtio_gpu uses drm_gem_shmem_get_sg_table instead of - * drm_gem_shmem_get_pages_sgt because virtio has it's own set of - * dma-ops. This is discouraged for other drivers, but should be fine - * since virtio_gpu doesn't support dma-buf import from other devices. - */ - shmem->pages = drm_gem_shmem_get_sg_table(&bo->base); - ret = PTR_ERR(shmem->pages); - if (ret) { - drm_gem_shmem_unpin(&bo->base); - shmem->pages = NULL; - return ret; - } + pages = drm_gem_shmem_get_pages_sgt(&bo->base); + if (IS_ERR(pages)) + return PTR_ERR(pages);
- if (use_dma_api) { - ret = dma_map_sgtable(vgdev->vdev->dev.parent, - shmem->pages, DMA_TO_DEVICE, 0); - if (ret) - return ret; - *nents = shmem->mapped = shmem->pages->nents; - } else { - *nents = shmem->pages->orig_nents; - } + if (use_dma_api) + *nents = pages->nents; + else + *nents = pages->orig_nents;
*ents = kvmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry), @@ -194,13 +160,13 @@ static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, }
if (use_dma_api) { - for_each_sgtable_dma_sg(shmem->pages, sg, si) { + 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(shmem->pages, sg, si) { + 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; diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index 2edf31806b74..06566e44307d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_vq.c +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c @@ -593,11 +593,10 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev, struct virtio_gpu_transfer_to_host_2d *cmd_p; struct virtio_gpu_vbuffer *vbuf; bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev); - struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
if (virtio_gpu_is_shmem(bo) && use_dma_api) - dma_sync_sgtable_for_device(vgdev->vdev->dev.parent, - shmem->pages, DMA_TO_DEVICE); + dma_sync_sgtable_for_device(&vgdev->vdev->dev, + bo->base.sgt, DMA_TO_DEVICE);
cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p)); memset(cmd_p, 0, sizeof(*cmd_p)); @@ -1017,11 +1016,9 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct virtio_gpu_device *vgdev, struct virtio_gpu_vbuffer *vbuf; bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
- if (virtio_gpu_is_shmem(bo) && use_dma_api) { - struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); - dma_sync_sgtable_for_device(vgdev->vdev->dev.parent, - shmem->pages, DMA_TO_DEVICE); - } + if (virtio_gpu_is_shmem(bo) && use_dma_api) + dma_sync_sgtable_for_device(&vgdev->vdev->dev, + bo->base.sgt, DMA_TO_DEVICE);
cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p)); memset(cmd_p, 0, sizeof(*cmd_p));