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Wed, 13 Sep 2023 13:44:03 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::faf:4cd0:ae27:1073]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::faf:4cd0:ae27:1073%6]) with mapi id 15.20.6768.036; Wed, 13 Sep 2023 13:44:03 +0000 From: Jason Gunthorpe To: Andy Gross , Alim Akhtar , Bjorn Andersson , AngeloGioacchino Del Regno , Baolin Wang , Christophe Leroy , Gerald Schaefer , Heiko Stuebner , iommu@lists.linux.dev, Jernej Skrabec , Jonathan Hunter , Joerg Roedel , Kevin Tian , Konrad Dybcio , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Russell King , linuxppc-dev@lists.ozlabs.org, Matthias Brugger , Matthew Rosato , Michael Ellerman , Nicholas Piggin , Orson Zhai , Rob Clark , Robin Murphy , Samuel Holland , Thierry Reding , Krishna Reddy , Chen-Yu Tsai , Will Deacon , Yong Wu , Chunyan Zhang Cc: Lu Baolu , Dmitry Osipenko , Jerry Snitselaar , Marek Szyprowski , Nicolin Chen , Niklas Schnelle , Steven Price , Thierry Reding Subject: [PATCH v8 01/24] iommu: Add iommu_ops->identity_domain Date: Wed, 13 Sep 2023 10:43:34 -0300 Message-ID: <1-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com> In-Reply-To: <0-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com> References: X-ClientProxiedBy: BL1PR13CA0376.namprd13.prod.outlook.com (2603:10b6:208:2c0::21) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|SA3PR12MB7923:EE_ X-MS-Office365-Filtering-Correlation-Id: 1bf3734c-2e1b-48b1-4c19-08dbb45f7c1a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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By making it always available it means the IDENTITY can be used in error handling paths to force the iommu driver into a known state. Devices implementing global static identity domains should avoid failing their attach_dev ops. To make global static domains simpler allow drivers to omit their free function and update the iommufd selftest. Convert rockchip to use the new mechanism. Tested-by: Steven Price Tested-by: Marek Szyprowski Tested-by: Nicolin Chen Reviewed-by: Lu Baolu Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommu.c | 6 +++++- drivers/iommu/iommufd/selftest.c | 5 ----- drivers/iommu/rockchip-iommu.c | 9 +-------- include/linux/iommu.h | 3 +++ 4 files changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3bfc56df4f781c..33bd1107090720 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1978,6 +1978,9 @@ static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus, if (bus == NULL || bus->iommu_ops == NULL) return NULL; + if (alloc_type == IOMMU_DOMAIN_IDENTITY && bus->iommu_ops->identity_domain) + return bus->iommu_ops->identity_domain; + domain = bus->iommu_ops->domain_alloc(alloc_type); if (!domain) return NULL; @@ -2011,7 +2014,8 @@ void iommu_domain_free(struct iommu_domain *domain) if (domain->type == IOMMU_DOMAIN_SVA) mmdrop(domain->mm); iommu_put_dma_cookie(domain); - domain->ops->free(domain); + if (domain->ops->free) + domain->ops->free(domain); } EXPORT_SYMBOL_GPL(iommu_domain_free); diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index 56506d5753f15c..d48a202a7c3b81 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -111,10 +111,6 @@ struct selftest_obj { }; }; -static void mock_domain_blocking_free(struct iommu_domain *domain) -{ -} - static int mock_domain_nop_attach(struct iommu_domain *domain, struct device *dev) { @@ -122,7 +118,6 @@ static int mock_domain_nop_attach(struct iommu_domain *domain, } static const struct iommu_domain_ops mock_blocking_ops = { - .free = mock_domain_blocking_free, .attach_dev = mock_domain_nop_attach, }; diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index 8ff69fbf9f65db..033678f2f8b3ab 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -989,13 +989,8 @@ static int rk_iommu_identity_attach(struct iommu_domain *identity_domain, return 0; } -static void rk_iommu_identity_free(struct iommu_domain *domain) -{ -} - static struct iommu_domain_ops rk_identity_ops = { .attach_dev = rk_iommu_identity_attach, - .free = rk_iommu_identity_free, }; static struct iommu_domain rk_identity_domain = { @@ -1059,9 +1054,6 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type) { struct rk_iommu_domain *rk_domain; - if (type == IOMMU_DOMAIN_IDENTITY) - return &rk_identity_domain; - if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) return NULL; @@ -1186,6 +1178,7 @@ static int rk_iommu_of_xlate(struct device *dev, } static const struct iommu_ops rk_iommu_ops = { + .identity_domain = &rk_identity_domain, .domain_alloc = rk_iommu_domain_alloc, .probe_device = rk_iommu_probe_device, .release_device = rk_iommu_release_device, diff --git a/include/linux/iommu.h b/include/linux/iommu.h index c50a769d569a60..d0920b2a9f1c0e 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -260,6 +260,8 @@ struct iommu_iotlb_gather { * will be blocked by the hardware. * @pgsize_bitmap: bitmap of all possible supported page sizes * @owner: Driver module providing these ops + * @identity_domain: An always available, always attachable identity + * translation. */ struct iommu_ops { bool (*capable)(struct device *dev, enum iommu_cap); @@ -294,6 +296,7 @@ struct iommu_ops { const struct iommu_domain_ops *default_domain_ops; unsigned long pgsize_bitmap; struct module *owner; + struct iommu_domain *identity_domain; }; /**