linux-kernel - [PATCH v2 09/16] driver core: add iommu device fault reporting data

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Message-Id: <1507244624-39189-10-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Thu,  5 Oct 2017 16:03:37 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     "Liu, Yi L" <yi.l.liu@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v2 09/16] driver core: add iommu device fault reporting data

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.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 include/linux/device.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 1d26079..4e3d543 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -42,6 +42,7 @@ struct fwnode_handle;
 struct iommu_ops;
 struct iommu_group;
 struct iommu_fwspec;
+struct iommu_fault_param;
 
 struct bus_attribute {
 	struct attribute	attr;
@@ -873,6 +874,7 @@ 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_fault_param: Per device generic IOMMU runtime parameters
  *
  * @offline_disabled: If set, the device is permanently online.
  * @offline:	Set after successful invocation of bus type's .offline().
@@ -962,6 +964,7 @@ struct device {
 	void	(*release)(struct device *dev);
 	struct iommu_group	*iommu_group;
 	struct iommu_fwspec	*iommu_fwspec;
+	struct iommu_fault_param	*iommu_fault_param;
 
 	bool			offline_disabled:1;
 	bool			offline:1;
-- 
2.7.4