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[24.155.109.49]) by smtp.googlemail.com with ESMTPSA id z12sm5364645oth.71.2019.10.08.12.41.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2019 12:41:56 -0700 (PDT) From: Rob Herring To: xen-devel@lists.xenproject.org Date: Tue, 8 Oct 2019 14:41:55 -0500 Message-Id: <20191008194155.4810-1-robh@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v2] xen: Stop abusing DT of_dma_configure API X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Stefano Stabellini , Oleksandr Andrushchenko , linux-kernel@vger.kernel.org, Julien Grall , Boris Ostrovsky , Robin Murphy , Christoph Hellwig , Nicolas Saenz Julienne Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" 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[24.155.109.49]) by smtp.googlemail.com with ESMTPSA id z12sm5364645oth.71.2019.10.08.12.41.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2019 12:41:56 -0700 (PDT) From: Rob Herring To: xen-devel@lists.xenproject.org Cc: linux-kernel@vger.kernel.org, Robin Murphy , Julien Grall , Nicolas Saenz Julienne , Oleksandr Andrushchenko , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Christoph Hellwig Subject: [PATCH v2] xen: Stop abusing DT of_dma_configure API Date: Tue, 8 Oct 2019 14:41:55 -0500 Message-Id: <20191008194155.4810-1-robh@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As the removed comments say, these aren't DT based devices. of_dma_configure() is going to stop allowing a NULL DT node and calling it will no longer work. The comment is also now out of date as of commit 9ab91e7c5c51 ("arm64: default to the direct mapping in get_arch_dma_ops"). Direct mapping is now the default rather than dma_dummy_ops. According to Stefano and Oleksandr, the only other part needed is setting the DMA masks and there's no reason to restrict the masks to 32-bits. So set the masks to 64 bits. Cc: Robin Murphy Cc: Julien Grall Cc: Nicolas Saenz Julienne Cc: Oleksandr Andrushchenko Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Stefano Stabellini Cc: Christoph Hellwig Cc: xen-devel@lists.xenproject.org Signed-off-by: Rob Herring --- v2: - Setup dma masks - Also fix xen_drm_front.c This can now be applied to the Xen tree independent of the coming of_dma_configure() changes. Rob drivers/gpu/drm/xen/xen_drm_front.c | 12 ++---------- drivers/xen/gntdev.c | 13 ++----------- 2 files changed, 4 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c index ba1828acd8c9..4be49c1aef51 100644 --- a/drivers/gpu/drm/xen/xen_drm_front.c +++ b/drivers/gpu/drm/xen/xen_drm_front.c @@ -718,17 +718,9 @@ static int xen_drv_probe(struct xenbus_device *xb_dev, struct device *dev = &xb_dev->dev; int ret; - /* - * The device is not spawn from a device tree, so arch_setup_dma_ops - * is not called, thus leaving the device with dummy DMA ops. - * This makes the device return error on PRIME buffer import, which - * is not correct: to fix this call of_dma_configure() with a NULL - * node to set default DMA ops. - */ - dev->coherent_dma_mask = DMA_BIT_MASK(32); - ret = of_dma_configure(dev, NULL, true); + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); if (ret < 0) { - DRM_ERROR("Cannot setup DMA ops, ret %d", ret); + DRM_ERROR("Cannot setup DMA mask, ret %d", ret); return ret; } diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index a446a7221e13..81401f386c9c 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -22,6 +22,7 @@ #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -34,9 +35,6 @@ #include #include #include -#ifdef CONFIG_XEN_GRANT_DMA_ALLOC -#include -#endif #include #include @@ -625,14 +623,7 @@ static int gntdev_open(struct inode *inode, struct file *flip) flip->private_data = priv; #ifdef CONFIG_XEN_GRANT_DMA_ALLOC priv->dma_dev = gntdev_miscdev.this_device; - - /* - * The device is not spawn from a device tree, so arch_setup_dma_ops - * is not called, thus leaving the device with dummy DMA ops. - * Fix this by calling of_dma_configure() with a NULL node to set - * default DMA ops. - */ - of_dma_configure(priv->dma_dev, NULL, true); + dma_coerce_mask_and_coherent(priv->dma_dev, DMA_BIT_MASK(64)); #endif pr_debug("priv %p\n", priv); -- 2.20.1