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authorJean-Philippe Brucker <jean-philippe.brucker@arm.com>2019-06-03 17:57:49 +0300
committerJoerg Roedel <jroedel@suse.de>2019-06-12 11:19:06 +0300
commitbf3255b3cfe2d06280340dbac3f44b65d3ee6da3 (patch)
tree8cc9e258d1fa55083b192700bd103a52d919a9b7 /include/linux/iommu.h
parent0c830e6b32826311fc2b9ea1f4679be0f4ef0933 (diff)
downloadlinux-bf3255b3cfe2d06280340dbac3f44b65d3ee6da3.tar.xz
iommu: Add recoverable fault reporting
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>
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 3e783f5bf472..76c8cda61dfd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -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;