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Tue, 7 Feb 2023 13:20:24 -0800 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail202.nvidia.com (10.126.190.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Tue, 7 Feb 2023 13:20:23 -0800 Received: from Asurada-Nvidia.nvidia.com (10.127.8.9) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.986.36 via Frontend Transport; Tue, 7 Feb 2023 13:20:23 -0800 From: Nicolin Chen To: , , , , , , CC: , , , , , Subject: [PATCH v2 05/10] iommufd: Add replace support in iommufd_access_set_ioas() Date: Tue, 7 Feb 2023 13:17:57 -0800 Message-ID: <931be169ff4a1f4d4f1ed060d722c2dc17ce6667.1675802050.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT101:EE_|DM6PR12MB4482:EE_ X-MS-Office365-Filtering-Correlation-Id: 69e8e6cd-b6b5-4d42-936e-08db095124d3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Then, call access->ops->unmap() to clean up the entire iopt. To allow an iommufd_access_unpin_pages() callback to happen via this unmap() call, add an ioas_unpin pointer so the unpin routine won't be affected by the "access->ioas = NULL" trick above. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 16 ++++++++++++++-- drivers/iommu/iommufd/iommufd_private.h | 1 + 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index f4bd6f532a90..10ce47484ffa 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -509,11 +509,23 @@ int iommufd_access_set_ioas(struct iommufd_access *access, u32 ioas_id) iommufd_ref_to_users(obj); } + /* + * Set ioas to NULL to block any further iommufd_access_pin_pages(). + * iommufd_access_unpin_pages() can continue using access->ioas_unpin. + */ + access->ioas = NULL; + if (cur_ioas) { + if (new_ioas) { + mutex_unlock(&access->ioas_lock); + access->ops->unmap(access->data, 0, ULONG_MAX); + mutex_lock(&access->ioas_lock); + } iopt_remove_access(&cur_ioas->iopt, access); refcount_dec(&cur_ioas->obj.users); } + access->ioas_unpin = new_ioas; access->ioas = new_ioas; mutex_unlock(&access->ioas_lock); @@ -587,11 +599,11 @@ void iommufd_access_unpin_pages(struct iommufd_access *access, return; mutex_lock(&access->ioas_lock); - if (!access->ioas) { + if (!access->ioas_unpin) { mutex_unlock(&access->ioas_lock); return; } - iopt = &access->ioas->iopt; + iopt = &access->ioas_unpin->iopt; down_read(&iopt->iova_rwsem); iopt_for_each_contig_area(&iter, area, iopt, iova, last_iova) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 2f4bb106bac6..593138bb37b8 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -261,6 +261,7 @@ struct iommufd_access { struct iommufd_object obj; struct iommufd_ctx *ictx; struct iommufd_ioas *ioas; + struct iommufd_ioas *ioas_unpin; struct mutex ioas_lock; const struct iommufd_access_ops *ops; void *data;