Jean-Philippe Brucker fc36479db7 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 0c830e6b32 ("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>		2021-04-07 10:54:29 +02:00
..
acpi
asm-generic	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
clocksource
crypto	Keyrings miscellany	2021-02-23 16:09:23 -08:00
drm	drm/drm_vblank: set the dma-fence timestamp during send_vblank_event	2021-02-24 21:05:54 +05:30
dt-bindings	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
keys
kunit
kvm	KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key	2021-03-06 04:18:40 -05:00
linux	iommu: Add a page fault handler	2021-04-07 10:54:29 +02:00
math-emu
media	media: rc: compile rc-cec.c into rc-core	2021-03-11 11:40:28 +01:00
memory
misc
net	net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending	2021-02-23 11:29:52 -08:00
pcmcia
ras
rdma
scsi
soc	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
sound	ALSA/ASoC/SOF/SoundWire: fix Kconfig issues	2021-03-02 18:30:07 +01:00
target
trace	block-5.12-2021-02-27	2021-02-28 11:23:38 -08:00
uapi	Merge git://git.kernel.org:/pub/scm/linux/kernel/git/netdev/net	2021-03-09 17:15:56 -08:00
vdso
video
xen	Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}	2021-03-10 16:39:29 -06:00