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Wed, 16 Aug 2023 12:42:42 -0500 From: Vasant Hegde To: , CC: , , , , Vasant Hegde Subject: [PATCH v2 07/10] iommu/amd: Refactor helper function for attaching / detaching device Date: Wed, 16 Aug 2023 17:40:28 +0000 Message-ID: <20230816174031.634453-8-vasant.hegde@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230816174031.634453-1-vasant.hegde@amd.com> References: <20230816174031.634453-1-vasant.hegde@amd.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000989EC:EE_|MW4PR12MB7239:EE_ X-MS-Office365-Filtering-Correlation-Id: 906fa6e2-a009-4fe8-4f80-08db9e803344 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Aug 2023 17:42:45.4612 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 906fa6e2-a009-4fe8-4f80-08db9e803344 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989EC.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7239 From: Suravee Suthikulpanit To use the new helper function for setting up GCR3 table. If system is booted with V2 page table then setup default GCR3 with domain GCR3 pointer. So that all devices in the domain uses same page table for translation. Also return page table setup status from do_attach() function. Signed-off-by: Suravee Suthikulpanit Co-developed-by: Vasant Hegde Signed-off-by: Vasant Hegde --- drivers/iommu/amd/iommu.c | 51 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 47 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index b54d4a0e2f4c..421f827fc24b 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -1804,15 +1804,38 @@ static void clear_dte_entry(struct amd_iommu *iommu, u16 devid) amd_iommu_apply_erratum_63(iommu, devid); } -static void do_attach(struct iommu_dev_data *dev_data, - struct protection_domain *domain) +static int _init_gcr3_tbl(struct iommu_dev_data *dev_data) +{ + struct gcr3_tbl_info *gcr3_info = &dev_data->gcr3_info; + + /* By default, GCR3 is set to support non-PASID devices. */ + gcr3_info->giov = true; + + /* + * By default, setup GCR3 table to support MAX PASIDs + * support by the IOMMU HW. + */ + return setup_gcr3_table(dev_data->domain, -1); +} + +static inline void _destroy_gcr3_tbl(struct iommu_dev_data *dev_data) +{ + struct gcr3_tbl_info *gcr3_info = &dev_data->gcr3_info; + + gcr3_info->giov = false; + free_gcr3_table(dev_data->domain); +} + +static int do_attach(struct iommu_dev_data *dev_data, + struct protection_domain *domain) { struct amd_iommu *iommu; bool ats; + int ret = 0; iommu = get_amd_iommu_from_dev(dev_data->dev); if (!iommu) - return; + return -EINVAL; ats = dev_data->ats_enabled; /* Update data structures */ @@ -1827,12 +1850,27 @@ static void do_attach(struct iommu_dev_data *dev_data, domain->dev_iommu[iommu->index] += 1; domain->dev_cnt += 1; + if (domain->pd_mode == PD_MODE_V2) { + ret = _init_gcr3_tbl(dev_data); + if (ret) + return ret; + + ret = __set_gcr3(dev_data, 0, + iommu_virt_to_phys(domain->iop.pgd)); + if (ret) { + _destroy_gcr3_tbl(dev_data); + return ret; + } + } + /* Update device table */ set_dte_entry(iommu, dev_data->devid, domain, ats, dev_data->ppr); clone_aliases(iommu, dev_data->dev); device_flush_dte(dev_data); + + return ret; } static void do_detach(struct iommu_dev_data *dev_data) @@ -1844,6 +1882,11 @@ static void do_detach(struct iommu_dev_data *dev_data) if (!iommu) return; + if (domain->pd_mode == PD_MODE_V2) { + __clear_gcr3(dev_data, 0); + _destroy_gcr3_tbl(dev_data); + } + /* Update data structures */ dev_data->domain = NULL; list_del(&dev_data->list); @@ -1889,7 +1932,7 @@ static int attach_device(struct device *dev, if (dev_is_pci(dev)) pdev_enable_caps(to_pci_dev(dev)); - do_attach(dev_data, domain); + ret = do_attach(dev_data, domain); /* * We might boot into a crash-kernel here. The crashed kernel -- 2.31.1