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iommu: Add recoverable fault reporting

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Some IOMMU hardware features, for example PCI PRI and Arm SMMU Stall,
enable recoverable I/O page faults. Allow IOMMU drivers to report PRI Page
Requests and Stall events through the new fault reporting API. The
consumer of the fault can be either an I/O page fault handler in the host,
or a guest OS.

Once handled, the fault must be completed by sending a page response back
to the IOMMU. Add an iommu_page_response() function to complete a page
fault.

There are two ways to extend the userspace API:
* Add a field to iommu_page_response and a flag to
  iommu_page_response::flags describing the validity of this field.
* Introduce a new iommu_page_response_X structure with a different version
  number. The kernel must then support both versions.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jean-Philippe Brucker 2019-06-03 15:57:49 +01:00 • committed by Joerg Roedel
parent 0c830e6b32
commit bf3255b3cf
3 changed files with 146 additions and 2 deletions
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19
include/linux/iommu.h
View file

@ -227,6 +227,7 @@ struct iommu_sva_ops {
* @sva_bind: Bind process address space to device
* @sva_unbind: Unbind process address space from device
* @sva_get_pasid: Get PASID associated to a SVA handle
* @page_response: handle page request response
* @pgsize_bitmap: bitmap of all possible supported page sizes
*/
struct iommu_ops {
@ -287,6 +288,10 @@ struct iommu_ops {
void (*sva_unbind)(struct iommu_sva *handle);
int (*sva_get_pasid)(struct iommu_sva *handle);
int (*page_response)(struct device *dev,
struct iommu_fault_event *evt,
struct iommu_page_response *msg);
unsigned long pgsize_bitmap;
};
@ -311,19 +316,25 @@ struct iommu_device {
* unrecoverable faults such as DMA or IRQ remapping faults.
*
* @fault: fault descriptor
* @list: pending fault event list, used for tracking responses
*/
struct iommu_fault_event {
struct iommu_fault fault;
struct list_head list;
};
/**
* struct iommu_fault_param - per-device IOMMU fault data
* @handler: Callback function to handle IOMMU faults at device level
* @data: handler private data
* @faults: holds the pending faults which needs response
* @lock: protect pending faults list
*/
struct iommu_fault_param {
iommu_dev_fault_handler_t handler;
void *data;
struct list_head faults;
struct mutex lock;
};
/**
@ -437,6 +448,8 @@ extern int iommu_unregister_device_fault_handler(struct device *dev);
extern int iommu_report_device_fault(struct device *dev,
struct iommu_fault_event *evt);
extern int iommu_page_response(struct device *dev,
struct iommu_page_response *msg);
extern int iommu_group_id(struct iommu_group *group);
extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
@ -765,6 +778,12 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
return -ENODEV;
}
static inline int iommu_page_response(struct device *dev,
struct iommu_page_response *msg)
{
return -ENODEV;
}
static inline int iommu_group_id(struct iommu_group *group)
{
return -ENODEV;