From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5E20D1FAF for ; Mon, 9 Oct 2023 08:51:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hiuE+TVM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696841494; x=1728377494; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5oSl+8ABY4vMSX9OU2YlTePC4xhTypHD8FVbeS8l5Dc=; b=hiuE+TVMaW6cQ5jEDIo5i3Rvld4MKyB1ZJCk4i04+YqCPHnWR/SJJPUV DwRZXAcq+UJ0HS+bXAbkbKmbsIw5BEmYsKIHF6zo1K25FC8OwEOQbZFZG iYNyyR/k356e4oc6pZatvPGPO6ZEXotG1lBQWO1RyYfPH6zLwkLPgVCyP 6KEWzt0e/kJ1Kew2wNLqg/wvIzGNu2d+NT+Rujjlk+iZs/yMoV6VK1522 gmluYLrOBezzbQ3KRKcvwRIESqUOK8C+GzdMlQ6DDsvss2xsu1w89icrv l0pPYcC1Xd1OJLiDLikmuwO2BvOYfr2QYBBU/7PgnnAC+onD2mst82V3h g==; X-IronPort-AV: E=McAfee;i="6600,9927,10857"; a="364390813" X-IronPort-AV: E=Sophos;i="6.03,209,1694761200"; d="scan'208";a="364390813" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Oct 2023 01:51:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10857"; a="818781686" X-IronPort-AV: E=Sophos;i="6.03,209,1694761200"; d="scan'208";a="818781686" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga008.fm.intel.com with ESMTP; 09 Oct 2023 01:51:33 -0700 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com, joao.m.martins@oracle.com Subject: [RFC 4/7] iommufd: Support attach/replace for SIOV virtual device {dev, pasid} Date: Mon, 9 Oct 2023 01:51:20 -0700 Message-Id: <20231009085123.463179-5-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231009085123.463179-1-yi.l.liu@intel.com> References: <20231009085123.463179-1-yi.l.liu@intel.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kevin Tian SIOV devices allows driver to tag different PASIDs for the virtual devices within it. Such driver should call iommufd_device_bind_pasid() to connect the pasid of the device to iommufd, and then driver is able to attach the virtual device to IOAS/HWPT with the iommufd_device_attach() API. Unlike physical devices, for SIOV virtual devices, iommufd_device_attach() eventually uses the idev->default_pasid when the virtual device is attached to an IOAS/HWPT. Also, there is no need to do immediate_attach per iommu domain allocation in the attach/replace path if any iommu domain allocation happens since the attach/replace is eventually pasid attach/replace. Signed-off-by: Kevin Tian Signed-off-by: Yi Liu --- drivers/iommu/iommufd/device.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 35c1419ee96b..4882e3106b2e 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -841,7 +841,11 @@ int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id) .pasid = IOMMU_PASID_INVALID }; - rc = iommufd_device_change_pt(idev, pt_id, &data); + if (idev->igroup) + rc = iommufd_device_change_pt(idev, pt_id, &data); + else + /* SIOV device follows generic pasid attach flow */ + rc = iommufd_device_pasid_attach(idev, idev->default_pasid, pt_id); if (rc) return rc; @@ -876,7 +880,12 @@ int iommufd_device_replace(struct iommufd_device *idev, u32 *pt_id) .pasid = IOMMU_PASID_INVALID }; - return iommufd_device_change_pt(idev, pt_id, &data); + if (idev->igroup) { + return iommufd_device_change_pt(idev, pt_id, &data); + } else { + /* SIOV device follows generic pasid replace flow */ + return iommufd_device_pasid_replace(idev, idev->default_pasid, pt_id); + } } EXPORT_SYMBOL_NS_GPL(iommufd_device_replace, IOMMUFD); @@ -891,8 +900,12 @@ void iommufd_device_detach(struct iommufd_device *idev) { struct iommufd_hw_pagetable *hwpt; - hwpt = iommufd_hw_pagetable_detach(idev); - iommufd_hw_pagetable_put(idev->ictx, hwpt); + if (idev->igroup) { + hwpt = iommufd_hw_pagetable_detach(idev); + iommufd_hw_pagetable_put(idev->ictx, hwpt); + } else { + iommufd_device_pasid_detach(idev, idev->default_pasid); + } refcount_dec(&idev->obj.users); } EXPORT_SYMBOL_NS_GPL(iommufd_device_detach, IOMMUFD); -- 2.34.1