From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELsTgR40x6g2DrVc4ZKr0LZEBzSragQSvagVFcNGzhSNQ2o8rEXYTetJc2QTmuPFZYlpCHQ+ ARC-Seal: i=1; a=rsa-sha256; t=1521774607; cv=none; d=google.com; s=arc-20160816; b=b/zwlvMJs0R21qGG8rNQHz7R4g8WgAU3VV/xagIGjDaP4oDnzQrWooA3HEmqSKQQpc vMXQKR+tTI1yODHwAW9BjBgjqvWFtvvUG12dJ+AlXouVXB97CZDVbv39fFiSCxWqB3gr l/Ty7RsE12lZYDZISu3e/ENx9S+jxAXR3i8WnFk+Pkx0wLsR6FjZnd8IsU+HB1J2PlXZ sjDzrRgREnTPKT1YEg8QvfAha4AE6Ehfy11cA+zMc/ROzP3BAX3BfwPeDlBV6ixXNpzM pCgKs0BseSYsKHdUQ+1hQysTQqRSkP4LG+7dU1i7uTPv06dAIP87fXaGYvt4IDFhDwIh ljsA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :arc-authentication-results; bh=m3p8PAdMaSOchIhHUh64KINvisM9v5MbIp3oFSuPb54=; b=wzwadsmrBH8hL8dIh4DKanpc6SApbDav/UK7f58DJS1NpVWtNoo3bNWyrtwElrIcZ/ EQV9W99dbOsewCcHD0uLKg9MqI8saSuAb4xNtdZOGDYAa6MNaeZZDSowrMcgXC/b4Ho8 PstvGXAp6KpgKF0jTFsp+m+UDjE2jNPWVWTtBAEXRJXtitBeR1n4z2IszqLiGuzYYpzD geI0b+jgfLOtyvBgp1yZHg+xf0hZ/YCS7GuBOadStkVEPGlV1ef5yyvmhyKLlxdUc9Eh lu54XPNT2cJO/PnJ2ODZPPYNkCS+Ag2DU0Mxi/JyycY2CfE+F4qyZgq7mn1XlONveXmI 0opw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of jacob.jun.pan@linux.intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=jacob.jun.pan@linux.intel.com Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of jacob.jun.pan@linux.intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=jacob.jun.pan@linux.intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,348,1517904000"; d="scan'208";a="26316006" From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , Greg Kroah-Hartman , Rafael Wysocki Cc: "Liu, Yi L" , Lan Tianyu , "Tian, Kevin" , Raj Ashok , Alex Williamson , Jean Delvare , "Christoph Hellwig" , Jacob Pan Subject: [PATCH v4 11/22] driver core: add per device iommu param Date: Thu, 22 Mar 2018 20:12:03 -0700 Message-Id: <1521774734-48433-12-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595696330699898501?= X-GMAIL-MSGID: =?utf-8?q?1595696330699898501?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: DMA faults can be detected by IOMMU at device level. Adding a pointer to struct device allows IOMMU subsystem to report relevant faults back to the device driver for further handling. For direct assigned device (or user space drivers), guest OS holds responsibility to handle and respond per device IOMMU fault. Therefore we need fault reporting mechanism to propagate faults beyond IOMMU subsystem. There are two other IOMMU data pointers under struct device today, here we introduce iommu_param as a parent pointer such that all device IOMMU data can be consolidated here. The idea was suggested here by Greg KH and Joerg. The name iommu_param is chosen here since iommu_data has been used. Suggested-by: Greg Kroah-Hartman Signed-off-by: Jacob Pan Signed-off-by: Jean-Philippe Brucker Link: https://lkml.org/lkml/2017/10/6/81 --- include/linux/device.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/device.h b/include/linux/device.h index b093405..35d9f34 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -41,6 +41,7 @@ struct iommu_ops; struct iommu_group; struct iommu_fwspec; struct dev_pin_info; +struct iommu_param; struct bus_attribute { struct attribute attr; @@ -872,6 +873,7 @@ struct dev_links_info { * device (i.e. the bus driver that discovered the device). * @iommu_group: IOMMU group the device belongs to. * @iommu_fwspec: IOMMU-specific properties supplied by firmware. + * @iommu_param: Per device generic IOMMU runtime data * * @offline_disabled: If set, the device is permanently online. * @offline: Set after successful invocation of bus type's .offline(). @@ -961,6 +963,7 @@ struct device { void (*release)(struct device *dev); struct iommu_group *iommu_group; struct iommu_fwspec *iommu_fwspec; + struct iommu_param *iommu_param; bool offline_disabled:1; bool offline:1; -- 2.7.4