Commit ec6bc2e9 authored Jun 03, 2019 by Jacob Pan Committed by Joerg Roedel Jun 12, 2019

driver core: Add per device iommu param



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 <gregkh@linuxfoundation.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Link: https://lkml.org/lkml/2017/10/6/81


Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 57274ea2

include/linux/device.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,7 @@ struct iommu_ops;
		struct iommu_group;
		struct iommu_fwspec;
		struct dev_pin_info;
		struct iommu_param;

		struct bus_attribute {
		struct attribute attr;
		@@ -959,6 +960,7 @@ 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().
		@@ -1052,6 +1054,7 @@ 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;

Admin message