The span iterator travels over the indexes of the interval_tree, not the
nodes, and classifies spans of indexes as either 'used' or 'hole'.

'used' spans are fully covered by nodes in the tree and 'hole' spans have
no node intersecting the span.

This is done greedily such that spans are maximally sized and every
iteration step switches between used/hole.

As an example a trivial allocator can be written as:

	for (interval_tree_span_iter_first(&span, itree, 0, ULONG_MAX);
	     !interval_tree_span_iter_done(&span);
	     interval_tree_span_iter_next(&span))
		if (span.is_hole &&
		    span.last_hole - span.start_hole >= allocation_size - 1)
			return span.start_hole;

With all the tricky boundary conditions handled by the library code.

The following iommufd patches have several algorithms for its overlapping
node interval trees that are significantly simplified with this kind of
iteration primitive. As it seems generally useful, put it into lib/.

Link: https://lore.kernel.org/r/3-v6-a196d26f289e+11787-iommufd_jgg@nvidia.comReviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

These complement the group interfaces used by VFIO and are for use by
iommufd. The main difference is that multiple devices in the same group
can all share the ownership by passing the same ownership pointer.

Move the common code into shared functions.

Link: https://lore.kernel.org/r/2-v6-a196d26f289e+11787-iommufd_jgg@nvidia.comTested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

This queries if a domain linked to a device should expect to support
enforce_cache_coherency() so iommufd can negotiate the rules for when a
domain should be shared or not.

For iommufd a device that declares IOMMU_CAP_ENFORCE_CACHE_COHERENCY will
not be attached to a domain that does not support it.

Link: https://lore.kernel.org/r/1-v6-a196d26f289e+11787-iommufd_jgg@nvidia.comReviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yu He <yu.he@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

iommu: Define EINVAL as device/domain incompatibility

This series is to replace the previous EMEDIUMTYPE patch in a VFIO series:
https://lore.kernel.org/kvm/Yxnt9uQTmbqul5lf@8bytes.org/

The purpose is to regulate all existing ->attach_dev callback functions to
use EINVAL exclusively for an incompatibility error between a device and a
domain. This allows VFIO and IOMMUFD to detect such a soft error, and then
try a different domain with the same device.

Among all the patches, the first two are preparatory changes. And then one
patch to update kdocs and another three patches for the enforcement
effort.

Link: https://lore.kernel.org/r/cover.1666042872.git.nicolinc@nvidia.com

Rename iommu-sva-lib.c[h] to iommu-sva.c[h] as it contains all code
for SVA implementation in iommu core.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-14-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Tweak the I/O page fault handling framework to route the page faults to
the domain and call the page fault handler retrieved from the domain.
This makes the I/O page fault handling framework possible to serve more
usage scenarios as long as they have an IOMMU domain and install a page
fault handler in it. Some unused functions are also removed to avoid
dead code.

The iommu_get_domain_for_dev_pasid() which retrieves attached domain
for a {device, PASID} pair is used. It will be used by the page fault
handling framework which knows {device, PASID} reported from the iommu
driver. We have a guarantee that the SVA domain doesn't go away during
IOPF handling, because unbind() won't free the domain until all the
pending page requests have been flushed from the pipeline. The drivers
either call iopf_queue_flush_dev() explicitly, or in stall case, the
device driver is required to flush all DMAs including stalled
transactions before calling unbind().

This also renames iopf_handle_group() to iopf_handler() to avoid
confusing.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-13-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

This adds some mechanisms around the iommu_domain so that the I/O page
fault handling framework could route a page fault to the domain and
call the fault handler from it.

Add pointers to the page fault handler and its private data in struct
iommu_domain. The fault handler will be called with the private data
as a parameter once a page fault is routed to the domain. Any kernel
component which owns an iommu domain could install handler and its
private parameter so that the page fault could be further routed and
handled.

This also prepares the SVA implementation to be the first consumer of
the per-domain page fault handling model. The I/O page fault handler
for SVA is copied to the SVA file with mmget_not_zero() added before
mmap_read_lock().
Suggested-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-12-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

These ops'es have been deprecated. There's no need for them anymore.
Remove them to avoid dead code.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-11-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

The existing iommu SVA interfaces are implemented by calling the SVA
specific iommu ops provided by the IOMMU drivers. There's no need for
any SVA specific ops in iommu_ops vector anymore as we can achieve
this through the generic attach/detach_dev_pasid domain ops.

This refactors the IOMMU SVA interfaces implementation by using the
iommu_attach/detach_device_pasid interfaces and align them with the
concept of the SVA iommu domain. Put the new SVA code in the SVA
related file in order to make it self-contained.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-10-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Add support for SVA domain allocation and provide an SVA-specific
iommu_domain_ops. This implementation is based on the existing SVA
code. Possible cleanup and refactoring are left for incremental
changes later.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Link: https://lore.kernel.org/r/20221031005917.45690-9-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Add support for SVA domain allocation and provide an SVA-specific
iommu_domain_ops. This implementation is based on the existing SVA
code. Possible cleanup and refactoring are left for incremental
changes later.

The VT-d driver will also need to support setting a DMA domain to a
PASID of device. Current SVA implementation uses different data
structures to track the domain and device PASID relationship. That's
the reason why we need to check the domain type in remove_dev_pasid
callback. Eventually we'll consolidate the data structures and remove
the need of domain type check.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-8-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

The SVA iommu_domain represents a hardware pagetable that the IOMMU
hardware could use for SVA translation. This adds some infrastructures
to support SVA domain in the iommu core. It includes:

- Extend the iommu_domain to support a new IOMMU_DOMAIN_SVA domain
  type. The IOMMU drivers that support allocation of the SVA domain
  should provide its own SVA domain specific iommu_domain_ops.
- Add a helper to allocate an SVA domain. The iommu_domain_free()
  is still used to free an SVA domain.

The report_iommu_fault() should be replaced by the new
iommu_report_device_fault(). Leave the existing fault handler with the
existing users and the newly added SVA members excludes it.
Suggested-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-7-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Attaching an IOMMU domain to a PASID of a device is a generic operation
for modern IOMMU drivers which support PASID-granular DMA address
translation. Currently visible usage scenarios include (but not limited):

 - SVA (Shared Virtual Address)
 - kernel DMA with PASID
 - hardware-assist mediated device

This adds the set_dev_pasid domain ops for setting the domain onto a
PASID of a device and remove_dev_pasid iommu ops for removing any setup
on a PASID of device. This also adds interfaces for device drivers to
attach/detach/retrieve a domain for a PASID of a device.

If multiple devices share a single group, it's fine as long the fabric
always routes every TLP marked with a PASID to the host bridge and only
the host bridge. For example, ACS achieves this universally and has been
checked when pci_enable_pasid() is called. As we can't reliably tell the
source apart in a group, all the devices in a group have to be considered
as the same source, and mapped to the same PASID table.

The DMA ownership is about the whole device (more precisely, iommu group),
including the RID and PASIDs. When the ownership is converted, the pasid
array must be empty. This also adds necessary checks in the DMA ownership
interfaces.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-6-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

The Requester ID/Process Address Space ID (PASID) combination
identifies an address space distinct from the PCI bus address space,
e.g., an address space defined by an IOMMU.

But the PCIe fabric routes Memory Requests based on the TLP address,
ignoring any PASID (PCIe r6.0, sec 2.2.10.4), so a TLP with PASID that
SHOULD go upstream to the IOMMU may instead be routed as a P2P
Request if its address falls in a bridge window.

To ensure that all Memory Requests with PASID are routed upstream,
only enable PASID if ACS P2P Request Redirect and Upstream Forwarding
are enabled for the path leading to the device.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-5-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

The current kernel DMA with PASID support is based on the SVA with a flag
SVM_FLAG_SUPERVISOR_MODE. The IOMMU driver binds the kernel memory address
space to a PASID of the device. The device driver programs the device with
kernel virtual address (KVA) for DMA access. There have been security and
functional issues with this approach:

- The lack of IOTLB synchronization upon kernel page table updates.
  (vmalloc, module/BPF loading, CONFIG_DEBUG_PAGEALLOC etc.)
- Other than slight more protection, using kernel virtual address (KVA)
  has little advantage over physical address. There are also no use
  cases yet where DMA engines need kernel virtual addresses for in-kernel
  DMA.

This removes SVM_FLAG_SUPERVISOR_MODE support from the IOMMU interface.
The device drivers are suggested to handle kernel DMA with PASID through
the kernel DMA APIs.

The drvdata parameter in iommu_sva_bind_device() and all callbacks is not
needed anymore. Cleanup them as well.

Link: https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-4-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Use this field to save the number of PASIDs that a device is able to
consume. It is a generic attribute of a device and lifting it into the
per-device dev_iommu struct could help to avoid the boilerplate code
in various IOMMU drivers.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-3-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Use this field to keep the number of supported PASIDs that an IOMMU
hardware is able to support. This is a generic attribute of an IOMMU
and lifting it into the per-IOMMU device structure makes it possible
to allocate a PASID for device without calls into the IOMMU drivers.
Any iommu driver that supports PASID related features should set this
field before enabling them on the devices.

In the Intel IOMMU driver, intel_iommu_sm is moved to CONFIG_INTEL_IOMMU
enclave so that the pasid_supported() helper could be used in dmar.c
without compilation errors.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-2-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

The mtk_iommu and virtio drivers have places in the ->attach_dev callback
functions that return hardcode errnos instead of the returned values, but
callers of these ->attach_dv callback functions may care. Propagate them
directly without the extra conversions.

Link: https://lore.kernel.org/r/ca8c5a447b87002334f83325f28823008b4ce420.1666042873.git.nicolinc@nvidia.comReviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Following the new rules in include/linux/iommu.h kdocs, update all drivers
->attach_dev callback functions to return EINVAL in the failure paths that
are related to domain incompatibility.

Also, drop adjacent error prints to prevent a kernel log spam.

Link: https://lore.kernel.org/r/f52a07f7320da94afe575c9631340d0019a203a7.1666042873.git.nicolinc@nvidia.comReviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Following the new rules in include/linux/iommu.h kdocs, EINVAL now can be
used to indicate that domain and device are incompatible by a caller that
treats it as a soft failure and tries attaching to another domain.

On the other hand, there are ->attach_dev callback functions returning it
for obvious device-specific errors. They will result in some inefficiency
in the caller handling routine.

Update these places to corresponding errnos following the new rules.

Link: https://lore.kernel.org/r/5924c03bea637f05feb2a20d624bae086b555ec5.1666042872.git.nicolinc@nvidia.comReviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Cases like VFIO wish to attach a device to an existing domain that was
not allocated specifically from the device. This raises a condition
where the IOMMU driver can fail the domain attach because the domain and
device are incompatible with each other.

This is a soft failure that can be resolved by using a different domain.

Provide a dedicated errno EINVAL from the IOMMU driver during attach that
the reason why the attach failed is because of domain incompatibility.

VFIO can use this to know that the attach is a soft failure and it should
continue searching. Otherwise, the attach will be a hard failure and VFIO
will return the code to userspace.

Update kdocs to add rules of return value to the attach_dev op and APIs.

Link: https://lore.kernel.org/r/bd56d93c18621104a0fa1b0de31e9b760b81b769.1666042872.git.nicolinc@nvidia.comSuggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

The same checks are done in amd_iommu_probe_device(). If any of them fails
there, then the device won't get a group, so there's no way for it to even
reach amd_iommu_attach_device anymore.

Link: https://lore.kernel.org/r/c054654a81f2b675c73108fe4bf10e45335a721a.1666042872.git.nicolinc@nvidia.comSuggested-by: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Pull fbdev fixes from Helge Deller:
 "A use-after-free bugfix in the smscufx driver and various minor error
  path fixes, smaller build fixes, sysfs fixes and typos in comments in
  the stifb, sisfb, da8xxfb, xilinxfb, sm501fb, gbefb and cyber2000fb
  drivers"

* tag 'fbdev-for-6.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev:
  fbdev: cyber2000fb: fix missing pci_disable_device()
  fbdev: sisfb: use explicitly signed char
  fbdev: smscufx: Fix several use-after-free bugs
  fbdev: xilinxfb: Make xilinxfb_release() return void
  fbdev: sisfb: fix repeated word in comment
  fbdev: gbefb: Convert sysfs snprintf to sysfs_emit
  fbdev: sm501fb: Convert sysfs snprintf to sysfs_emit
  fbdev: stifb: Fall back to cfb_fillrect() on 32-bit HCRX cards
  fbdev: da8xx-fb: Fix error handling in .remove()
  fbdev: MIPS supports iomem addresses

Pull char/misc fixes from Greg KH:
 "Some small driver fixes for 6.1-rc3.  They include:

   - iio driver bugfixes

   - counter driver bugfixes

   - coresight bugfixes, including a revert and then a second fix to get
     it right.

  All of these have been in linux-next with no reported problems"

* tag 'char-misc-6.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (21 commits)
  misc: sgi-gru: use explicitly signed char
  coresight: cti: Fix hang in cti_disable_hw()
  Revert "coresight: cti: Fix hang in cti_disable_hw()"
  counter: 104-quad-8: Fix race getting function mode and direction
  counter: microchip-tcb-capture: Handle Signal1 read and Synapse
  coresight: cti: Fix hang in cti_disable_hw()
  coresight: Fix possible deadlock with lock dependency
  counter: ti-ecap-capture: fix IS_ERR() vs NULL check
  counter: Reduce DEFINE_COUNTER_ARRAY_POLARITY() to defining counter_array
  iio: bmc150-accel-core: Fix unsafe buffer attributes
  iio: adxl367: Fix unsafe buffer attributes
  iio: adxl372: Fix unsafe buffer attributes
  iio: at91-sama5d2_adc: Fix unsafe buffer attributes
  iio: temperature: ltc2983: allocate iio channels once
  tools: iio: iio_utils: fix digit calculation
  iio: adc: stm32-adc: fix channel sampling time init
  iio: adc: mcp3911: mask out device ID in debug prints
  iio: adc: mcp3911: use correct id bits
  iio: adc: mcp3911: return proper error code on failure to allocate trigger
  iio: adc: mcp3911: fix sizeof() vs ARRAY_SIZE() bug
  ...

Pull USB fixes from Greg KH:
 "A few small USB fixes for 6.1-rc3. Include in here are:

   - MAINTAINERS update, including a big one for the USB gadget
     subsystem. Many thanks to Felipe for all of the years of hard work
     he has done on this codebase, it was greatly appreciated.

   - dwc3 driver fixes for reported problems.

   - xhci driver fixes for reported problems.

   - typec driver fixes for minor issues

   - uvc gadget driver change, and then revert as it wasn't relevant for
     6.1-final, as it is a new feature and people are still reviewing
     and modifying it.

  All of these have been in the linux-next tree with no reported issues"

* tag 'usb-6.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: dwc3: gadget: Don't set IMI for no_interrupt
  usb: dwc3: gadget: Stop processing more requests on IMI
  Revert "usb: gadget: uvc: limit isoc_sg to super speed gadgets"
  xhci: Remove device endpoints from bandwidth list when freeing the device
  xhci-pci: Set runtime PM as default policy on all xHC 1.2 or later devices
  xhci: Add quirk to reset host back to default state at shutdown
  usb: xhci: add XHCI_SPURIOUS_SUCCESS to ASM1042 despite being a V0.96 controller
  usb: dwc3: st: Rely on child's compatible instead of name
  usb: gadget: uvc: limit isoc_sg to super speed gadgets
  usb: bdc: change state when port disconnected
  usb: typec: ucsi: acpi: Implement resume callback
  usb: typec: ucsi: Check the connection on resume
  usb: gadget: aspeed: Fix probe regression
  usb: gadget: uvc: fix sg handling during video encode
  usb: gadget: uvc: fix sg handling in error case
  usb: gadget: uvc: fix dropped frame after missed isoc
  usb: dwc3: gadget: Don't delay End Transfer on delayed_status
  usb: dwc3: Don't switch OTG -> peripheral if extcon is present
  MAINTAINERS: Update maintainers for broadcom USB
  MAINTAINERS: move USB gadget and phy entries under the main USB entry

Pull gpio fixes from Bartosz Golaszewski:

 - convert gpio-tegra to using an immutable irqchip

 - MAINTAINERS update

* tag 'gpio-fixes-for-v6.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  MAINTAINERS: Change myself to a maintainer
  gpio: tegra: Convert to immutable irq chip

Pull perf fixes from Borislav Petkov:

 - Rename a perf memory level event define to denote it is of CXL type

 - Add Alder and Raptor Lakes support to RAPL

 - Make sure raw sample data is output with tracepoints

* tag 'perf_urgent_for_v6.1_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/mem: Rename PERF_MEM_LVLNUM_EXTN_MEM to PERF_MEM_LVLNUM_CXL
  perf/x86/rapl: Add support for Intel Raptor Lake
  perf/x86/rapl: Add support for Intel AlderLake-N
  perf: Fix missing raw data on tracepoint events

Merge tag 'loongarch-fixes-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch fixes from Huacai Chen:
 "Remove unused kernel stack padding, fix some build errors/warnings and
  two bugs in laptop platform driver"

* tag 'loongarch-fixes-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  platform/loongarch: laptop: Fix possible UAF and simplify generic_acpi_laptop_init()
  platform/loongarch: laptop: Adjust resume order for loongson_hotkey_resume()
  LoongArch: BPF: Avoid declare variables in switch-case
  LoongArch: Use flexible-array member instead of zero-length array
  LoongArch: Remove unused kernel stack padding

Pull cifs fixes from Steve French:

 - use after free fix for reconnect race

 - two memory leak fixes

* tag '6.1-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix use-after-free caused by invalid pointer `hostname`
  cifs: Fix pages leak when writedata alloc failed in cifs_write_from_iter()
  cifs: Fix pages array leak when writedata alloc failed in cifs_writedata_alloc()

Pull random number generator fix from Jason Donenfeld:
 "One fix from Jean-Philippe Brucker, addressing a regression in which
  early boot code on ARM64 would use the non-_early variant of the
  arch_get_random family of functions, resulting in the architectural
  random number generator appearing unavailable during that early phase
  of boot.

  The fix simply changes arch_get_random*() to arch_get_random*_early().

  This distinction between these two functions is a bit of an old wart
  I'm not a fan of, and for 6.2 I'll see if I can make obsolete the
  _early variant, so that one function does the right thing in all
  contexts without overhead"

* tag 'random-6.1-rc3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random:
  random: use arch_get_random*_early() in random_init()

Pull SCSI fixes from James Bottomley:
 "Varions small  fixes, all  in drivers.

  Some of these arrived during the merge window and got held over to
  make sure of testing on the -rc tree.

  The biggest change is for standards conformance in the target driver,
  closely followed by a set of bug fixes in megaraid_sas"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (21 commits)
  scsi: ufs: core: Fix typo in comment
  scsi: mpi3mr: Select CONFIG_SCSI_SAS_ATTRS
  scsi: ufs: core: Fix typo for register name in comments
  scsi: pm80xx: Display proc_name in sysfs
  scsi: ufs: core: Fix the error log in ufshcd_query_flag_retry()
  scsi: ufs: core: Remove unneeded casts from void *
  scsi: lpfc: Fix spelling mistake "unsolicted" -> "unsolicited"
  scsi: qla2xxx: Use transport-defined speed mask for supported_speeds
  scsi: target: iblock: Fold iblock_emulate_read_cap_with_block_size() into iblock_get_blocks()
  scsi: qla2xxx: Fix serialization of DCBX TLV data request
  scsi: ufs: qcom: Remove redundant dev_err() call
  scsi: megaraid_sas: Move megasas_dbg_lvl init to megasas_init()
  scsi: megaraid_sas: Remove unnecessary memset()
  scsi: megaraid_sas: Simplify megasas_update_device_list
  scsi: megaraid_sas: Correct an error message
  scsi: megaraid_sas: Correct value passed to scsi_device_lookup()
  scsi: target: core: UA on all LUNs after reset
  scsi: target: core: New key must be used for moved PR
  scsi: target: core: Abort all preempted regs if requested
  scsi: target: core: Fix memory leak in preempt_and_abort
  ...

Pull block fixes from Jens Axboe:

 - NVMe pull request via Christoph:
      - make the multipath dma alignment match the non-multipath one
        (Keith Busch)
      - fix a bogus use of sg_init_marker() (Nam Cao)
      - fix circulr locking in nvme-tcp (Sagi Grimberg)

 - Initialization fix for requests allocated via the special hw queue
   allocator (John)

 - Fix for a regression added in this release with the batched
   completions of end_io backed requests (Ming)

 - Error handling leak fix for rbd (Yang)

 - Error handling leak fix for add_disk() failure (Yu)

* tag 'block-6.1-2022-10-28' of git://git.kernel.dk/linux:
  blk-mq: Properly init requests from blk_mq_alloc_request_hctx()
  blk-mq: don't add non-pt request with ->end_io to batch
  rbd: fix possible memory leak in rbd_sysfs_init()
  nvme-multipath: set queue dma alignment to 3
  nvme-tcp: fix possible circular locking when deleting a controller under memory pressure
  nvme-tcp: replace sg_init_marker() with sg_init_table()
  block: fix memory leak for elevator on add_disk failure

Pull io_uring fix from Jens Axboe:
 "Just a fix for a locking regression introduced with the deferred
  task_work running from this merge window"

* tag 'io_uring-6.1-2022-10-28' of git://git.kernel.dk/linux:
  io_uring: unlock if __io_run_local_work locked inside
  io_uring: use io_run_local_work_locked helper

Pull misc hotfixes from Andrew Morton:
 "Eight fix pre-6.0 bugs and the remainder address issues which were
  introduced in the 6.1-rc merge cycle, or address issues which aren't
  considered sufficiently serious to warrant a -stable backport"

* tag 'mm-hotfixes-stable-2022-10-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (23 commits)
  mm: multi-gen LRU: move lru_gen_add_mm() out of IRQ-off region
  lib: maple_tree: remove unneeded initialization in mtree_range_walk()
  mmap: fix remap_file_pages() regression
  mm/shmem: ensure proper fallback if page faults
  mm/userfaultfd: replace kmap/kmap_atomic() with kmap_local_page()
  x86: fortify: kmsan: fix KMSAN fortify builds
  x86: asm: make sure __put_user_size() evaluates pointer once
  Kconfig.debug: disable CONFIG_FRAME_WARN for KMSAN by default
  x86/purgatory: disable KMSAN instrumentation
  mm: kmsan: export kmsan_copy_page_meta()
  mm: migrate: fix return value if all subpages of THPs are migrated successfully
  mm/uffd: fix vma check on userfault for wp
  mm: prep_compound_tail() clear page->private
  mm,madvise,hugetlb: fix unexpected data loss with MADV_DONTNEED on hugetlbfs
  mm/page_isolation: fix clang deadcode warning
  fs/ext4/super.c: remove unused `deprecated_msg'
  ipc/msg.c: fix percpu_counter use after free
  memory tier, sysfs: rename attribute "nodes" to "nodelist"
  MAINTAINERS: git://github.com -> https://github.com for nilfs2
  mm/kmemleak: prevent soft lockup in kmemleak_scan()'s object iteration loops
  ...

Pull powerpc fixes from Michael Ellerman:

 - Fix a case of rescheduling with user access unlocked, when preempt is
   enabled.

 - A follow-up fix for a recent fix, which could lead to IRQ state
   assertions firing incorrectly.

 - Two fixes for lockdep warnings seen when using kfence with the Hash
   MMU.

 - Two fixes for preempt warnings seen when using the Hash MMU.

 - Two fixes for the VAS coprocessor mechanism used on pseries.

 - Prevent building some of our older KVM backends when
   CONTEXT_TRACKING_USER is enabled, as it's known to cause crashes.

 - A couple of fixes for issues seen with PMU NMIs.

Thanks to Nicholas Piggin, Guenter Roeck, Frederic Barrat Haren Myneni,
Sachin Sant, and Samuel Holland.

* tag 'powerpc-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s/interrupt: Fix clear of PACA_IRQS_HARD_DIS when returning to soft-masked context
  powerpc/64s/interrupt: Perf NMI should not take normal exit path
  powerpc/64/interrupt: Prevent NMI PMI causing a dangerous warning
  KVM: PPC: BookS PR-KVM and BookE do not support context tracking
  powerpc: Fix reschedule bug in KUAP-unlocked user copy
  powerpc/64s: Fix hash__change_memory_range preemption warning
  powerpc/64s: Disable preemption in hash lazy mmu mode
  powerpc/64s: make linear_map_hash_lock a raw spinlock
  powerpc/64s: make HPTE lock and native_tlbie_lock irq-safe
  powerpc/64s: Add lockdep for HPTE lock
  powerpc/pseries: Use lparcfg to reconfig VAS windows for DLPAR CPU
  powerpc/pseries/vas: Add VAS IRQ primary handler

Currently the return value of 'sub_driver->init' is not checked. If
sparse_keymap_setup() called in the init function fails, 'generic_
inputdev' is freed, then it will lead a UAF when using it in generic_
acpi_laptop_init(). Fix it by checking the return value and setting
generic_inputdev to NULL after free, so as to avoid double free it.

The error code in generic_subdriver_init() is always negative, so the
return of generic_subdriver_init() can be simplified.

Fixes: 6246ed09 ("LoongArch: Add ACPI-based generic laptop driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Some laptops don't support SW_LID, but still have backlight control,
move backlight resuming before SW_LID event handling so as to avoid
backlight mistake due to early return.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Not all compilers support declare variables in switch-case, so move
declarations to the beginning of a function. Otherwise we may get such
build errors:

arch/loongarch/net/bpf_jit.c: In function ‘emit_atomic’:
arch/loongarch/net/bpf_jit.c:362:3: error: a label can only be part of a statement and a declaration is not a statement
   u8 r0 = regmap[BPF_REG_0];
   ^~
arch/loongarch/net/bpf_jit.c: In function ‘build_insn’:
arch/loongarch/net/bpf_jit.c:727:3: error: a label can only be part of a statement and a declaration is not a statement
   u8 t7 = -1;
   ^~
arch/loongarch/net/bpf_jit.c:778:3: error: a label can only be part of a statement and a declaration is not a statement
   int ret;
   ^~~
arch/loongarch/net/bpf_jit.c:779:3: error: expected expression before ‘u64’
   u64 func_addr;
   ^~~
arch/loongarch/net/bpf_jit.c:780:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
   bool func_addr_fixed;
   ^~~~
arch/loongarch/net/bpf_jit.c:784:11: error: ‘func_addr’ undeclared (first use in this function); did you mean ‘in_addr’?
          &func_addr, &func_addr_fixed);
           ^~~~~~~~~
           in_addr
arch/loongarch/net/bpf_jit.c:784:11: note: each undeclared identifier is reported only once for each function it appears in
arch/loongarch/net/bpf_jit.c:814:3: error: a label can only be part of a statement and a declaration is not a statement
   u64 imm64 = (u64)(insn + 1)->imm << 32 | (u32)insn->imm;
   ^~~
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Eliminate the following coccicheck warning:
./arch/loongarch/include/asm/ptrace.h:32:15-21: WARNING use flexible-array member instead
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Yushan Zhou <katrinzhou@tencent.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>