Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751423AbdGQNIp (ORCPT ); Mon, 17 Jul 2017 09:08:45 -0400 Received: from mail-pg0-f66.google.com ([74.125.83.66]:33892 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751280AbdGQNIn (ORCPT ); Mon, 17 Jul 2017 09:08:43 -0400 From: Magnus Damm To: joro@8bytes.org Cc: laurent.pinchart+renesas@ideasonboard.com, geert+renesas@glider.be, sricharan@codeaurora.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, iommu@lists.linux-foundation.org, horms+renesas@verge.net.au, Magnus Damm , robin.murphy@arm.com, m.szyprowski@samsung.com Date: Mon, 17 Jul 2017 22:05:20 +0900 Message-Id: <150029672099.22030.9705035062184016120.sendpatchset@little-apple> In-Reply-To: <150029669967.22030.8059216113725566341.sendpatchset@little-apple> References: <150029669967.22030.8059216113725566341.sendpatchset@little-apple> Subject: [PATCH v2 02/05] iommu/ipmmu-vmsa: Consistent ->of_xlate() handling Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3435 Lines: 125 From: Magnus Damm The 32-bit ARM code gets updated to make use of ->of_xlate() and the code is shared between 64-bit and 32-bit ARM. The of_device_is_available() check gets dropped since it is included in of_iommu_xlate(). Suggested-by: Robin Murphy Signed-off-by: Magnus Damm --- Changes since V1: - Moved "Initialize once" check to ipmmu_of_xlate() - thanks Geert! drivers/iommu/ipmmu-vmsa.c | 51 ++++++++++++++------------------------------ 1 file changed, 17 insertions(+), 34 deletions(-) --- 0002/drivers/iommu/ipmmu-vmsa.c +++ work/drivers/iommu/ipmmu-vmsa.c 2017-07-17 21:03:38.340607110 +0900 @@ -734,6 +734,16 @@ error: return ret; } +static int ipmmu_of_xlate(struct device *dev, + struct of_phandle_args *spec) +{ + /* Initialize once - xlate() will call multiple times */ + if (to_priv(dev)) + return 0; + + return ipmmu_init_platform_device(dev); +} + #if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA) static struct iommu_domain *ipmmu_domain_alloc(unsigned type) @@ -750,11 +760,11 @@ static int ipmmu_add_device(struct devic struct iommu_group *group; int ret; - if (to_priv(dev)) { - dev_warn(dev, "IOMMU driver already assigned to device %s\n", - dev_name(dev)); - return -EINVAL; - } + /* + * Only let through devices that have been verified in xlate() + */ + if (!to_priv(dev)) + return -ENODEV; /* Create a device group and add the device to it. */ group = iommu_group_alloc(); @@ -773,10 +783,6 @@ static int ipmmu_add_device(struct devic goto error; } - ret = ipmmu_init_platform_device(dev); - if (ret < 0) - goto error; - /* * Create the ARM mapping, used by the ARM DMA mapping core to allocate * VAs. This will allocate a corresponding IOMMU domain. @@ -817,24 +823,13 @@ error: if (!IS_ERR_OR_NULL(group)) iommu_group_remove_device(dev); - kfree(to_priv(dev)->utlbs); - kfree(to_priv(dev)); - set_priv(dev, NULL); - return ret; } static void ipmmu_remove_device(struct device *dev) { - struct ipmmu_vmsa_iommu_priv *priv = to_priv(dev); - arm_iommu_detach_device(dev); iommu_group_remove_device(dev); - - kfree(priv->utlbs); - kfree(priv); - - set_priv(dev, NULL); } static const struct iommu_ops ipmmu_ops = { @@ -849,6 +844,7 @@ static const struct iommu_ops ipmmu_ops .add_device = ipmmu_add_device, .remove_device = ipmmu_remove_device, .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K, + .of_xlate = ipmmu_of_xlate, }; #endif /* !CONFIG_ARM && CONFIG_IOMMU_DMA */ @@ -958,19 +954,6 @@ static struct iommu_group *ipmmu_find_gr return group; } -static int ipmmu_of_xlate_dma(struct device *dev, - struct of_phandle_args *spec) -{ - /* If the IPMMU device is disabled in DT then return error - * to make sure the of_iommu code does not install ops - * even though the iommu device is disabled - */ - if (!of_device_is_available(spec->np)) - return -ENODEV; - - return ipmmu_init_platform_device(dev); -} - static const struct iommu_ops ipmmu_ops = { .domain_alloc = ipmmu_domain_alloc_dma, .domain_free = ipmmu_domain_free_dma, @@ -984,7 +967,7 @@ static const struct iommu_ops ipmmu_ops .remove_device = ipmmu_remove_device_dma, .device_group = ipmmu_find_group_dma, .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K, - .of_xlate = ipmmu_of_xlate_dma, + .of_xlate = ipmmu_of_xlate, }; #endif /* CONFIG_IOMMU_DMA */