summaryrefslogtreecommitdiffstats
path: root/drivers/iommu/Makefile
diff options
context:
space:
mode:
authorJean-Philippe Brucker <jean-philippe@linaro.org>2021-04-01 17:47:15 +0200
committerJoerg Roedel <jroedel@suse.de>2021-04-07 10:54:29 +0200
commitfc36479db74e957c4696b605a32c4afaa15fa6cb (patch)
tree0c0a8aa974d22a40060ad30a9213f7653075002f /drivers/iommu/Makefile
parent0860788df74085a5e14c1702610b2977fd9aac5e (diff)
downloadlinux-fc36479db74e957c4696b605a32c4afaa15fa6cb.tar.bz2
iommu: Add a page fault handler
Some systems allow devices to handle I/O Page Faults in the core mm. For example systems implementing the PCIe PRI extension or Arm SMMU stall model. Infrastructure for reporting these recoverable page faults was added to the IOMMU core by commit 0c830e6b3282 ("iommu: Introduce device fault report API"). Add a page fault handler for host SVA. IOMMU driver can now instantiate several fault workqueues and link them to IOPF-capable devices. Drivers can choose between a single global workqueue, one per IOMMU device, one per low-level fault queue, one per domain, etc. When it receives a fault event, most commonly in an IRQ handler, the IOMMU driver reports the fault using iommu_report_device_fault(), which calls the registered handler. The page fault handler then calls the mm fault handler, and reports either success or failure with iommu_page_response(). After the handler succeeds, the hardware retries the access. The iopf_param pointer could be embedded into iommu_fault_param. But putting iopf_param into the iommu_param structure allows us not to care about ordering between calls to iopf_queue_add_device() and iommu_register_device_fault_handler(). Tested-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20210401154718.307519-7-jean-philippe@linaro.org Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/Makefile')
-rw-r--r--drivers/iommu/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 61bd30cd8369..60fafc23dee6 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
obj-$(CONFIG_IOMMU_SVA_LIB) += iommu-sva-lib.o
+obj-$(CONFIG_IOMMU_SVA_LIB) += io-pgfault.o