From patchwork Thu May 26 23:50:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 12862932 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7D937C4332F for ; Thu, 26 May 2022 23:55:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 558E010FA22; Thu, 26 May 2022 23:55:00 +0000 (UTC) Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0426810F5F3; Thu, 26 May 2022 23:54:56 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: dmitry.osipenko) with ESMTPSA id BA73A1F459E1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1653609294; bh=DfGpDB1iV1ixwCzh/Jz+qOPyTI739+QNjEbh7MI3SKc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TtPQEs40wcntc109HGqx7J6Vxp8aB2CXxucraiEqf5LZPHlZlp2OW2gLyoYDpZbmO AbgqfWCH145/vjTZsxB4cKHKs9hY8/jZUtwEQHsc7eVQ6WWuURoxif8ihnjPG+hTeG LwSNEx/+z71LhNjEj3Qwgz1qKH7vEBxl+8WqKWL+XTXGYxEoD5UxseCKU4jrKI/lC5 wCB1C4w9W5rIcNwiJaY8P4XrxD9C6Ik2oQuo5gHN+uKBP7i+M+NtxR1Sfx5cteq/qL RSZrapHCuZkU/SVh9GChNxqHwFsnpkgTemN/DKvexkGBvMDjt05Qf0JA5R3g6dxJXS AtGHXemB5AkNQ== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gert Wollny , Gustavo Padovan , Daniel Stone , Tomeu Vizoso , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Steven Price , Alyssa Rosenzweig , Rob Clark , Emil Velikov , Robin Murphy , Qiang Yu , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin Subject: [PATCH v6 13/22] drm/virtio: Improve DMA API usage for shmem BOs Date: Fri, 27 May 2022 02:50:31 +0300 Message-Id: <20220526235040.678984-14-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220526235040.678984-1-dmitry.osipenko@collabora.com> References: <20220526235040.678984-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, amd-gfx@lists.freedesktop.org, Dmitry Osipenko , linux-tegra@vger.kernel.org, Dmitry Osipenko , kernel@collabora.com, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 --- drivers/gpu/drm/virtio/virtgpu_drv.c | 51 ++++++---------------- 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, 32 insertions(+), 100 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c index 5f25a8d15464..0141b7df97ec 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.c +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c @@ -46,12 +46,11 @@ 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]; int ret; DRM_INFO("pci: %s detected at %s\n", @@ -63,39 +62,7 @@ static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vd return ret; } - /* - * Normally the drm_dev_set_unique() call is done by core DRM. - * The following comment covers, why virtio cannot rely on it. - * - * Unlike the other virtual GPU drivers, virtio abstracts the - * underlying bus type by using struct virtio_device. - * - * Hence the dev_is_pci() check, used in core DRM, will fail - * and the unique returned will be the virtio_device "virtio0", - * while a "pci:..." one is required. - * - * A few other ideas were considered: - * - Extend the dev_is_pci() check [in drm_set_busid] to - * consider virtio. - * Seems like a bigger hack than what we have already. - * - * - Point drm_device::dev to the parent of the virtio_device - * Semantic changes: - * * Using the wrong device for i2c, framebuffer_alloc and - * prime import. - * Visual changes: - * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, - * will print the wrong information. - * - * We could address the latter issues, by introducing - * drm_device::bus_dev, ... which would be used solely for this. - * - * So for the moment keep things as-is, with a bulky comment - * for the next person who feels like removing this - * drm_dev_set_unique() quirk. - */ - snprintf(unique, sizeof(unique), "pci:%s", pname); - return drm_dev_set_unique(dev, unique); + return 0; } static int virtio_gpu_probe(struct virtio_device *vdev) @@ -109,18 +76,24 @@ static int virtio_gpu_probe(struct virtio_device *vdev) if (virtio_gpu_modeset == 0) return -EINVAL; - dev = drm_dev_alloc(&driver, &vdev->dev); + /* + * The virtio-gpu device is a virtual device that doesn't have DMA + * ops assigned to it, nor DMA mask set and etc. Its parent device + * is actual GPU device we want to use it for the DRM's device in + * order to benefit from using generic DRM APIs. + */ + dev = drm_dev_alloc(&driver, vdev->dev.parent); 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 18f70ef6b4d0..8d7728181de0 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_OR_ZERO(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));