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1,413,148 commits

Author SHA1 Message Date
Dan Williams
2d2b3fe002 cxl/port: Unify endpoint and switch port lookup
In support of generic CXL protocol error handling across various 'struct
cxl_port' types, update find_cxl_port_by_uport() to retrieve endpoint CXL
port companions from endpoint PCIe device instances.

The end result is that upstream switch ports and endpoint ports can share
error handling and eventually delete the misplaced cxl_error_handlers from
the cxl_pci class driver.

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-10-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:46:33 -07:00
Dan Williams
dab7162d0a cxl/port: Move endpoint component register management to cxl_port
In preparation for generic protocol error handling across CXL endpoints,
whether they be memory expander class devices or accelerators, drop the
endpoint component management from cxl_dev_state.

Organize all CXL port component management through the common cxl_port
driver.

Note that the end game is that drivers/cxl/core/ras.c loses all
dependencies on a 'struct cxl_dev_state' parameter and operates only on
port resources. The removal of component register mapping from cxl_pci is
an incremental step towards that.

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-9-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:46:17 -07:00
Terry Bowman
ef1df6cf69 cxl/port: Map Port RAS registers
In preparation for CXL VH (Virtual Host) topology protocol error handling,
add RAS capability registered mapping for all ports in a CXL VH topology.
This includes the RAS capabilities of Switch Upstream Ports, Switch
Downstream Ports, Host Bridge Ports ("upstream"), and Root Ports
("downstream")

Update cxl_port_add_dport() to map the upstream RAS capability on first
'dport' attach.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Link: https://patch.msgid.link/20260131000403.2135324-8-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:45:57 -07:00
Dan Williams
7f5ff740ce cxl/port: Move dport RAS setup to dport add time
Towards the end goal of making all CXL RAS capability handling uniform
across host bridge ports, upstream switch ports, and endpoint ports, move
dport RAS setup. Move it to cxl_switch_port_probe() context for switch / VH
dports (via cxl_port_add_dport()) and cxl_endpoint_port_probe() context for
an RCH dport. Rename the RAS setup helper to devm_cxl_dport_ras_setup() for
symmetry with devm_cxl_switch_port_decoders_setup().

Only the RCH version needs to be exported and the cxl_test mocking can be
deleted with a dev_is_pci() check on the dport_dev.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-7-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:44:51 -07:00
Dan Williams
3864cb60da cxl/port: Move dport probe operations to a driver event
In preparation for adding more register setup to the cxl_port_add_dport()
path (for RAS register mapping), move the dport creation event to a driver
callback. This achieves two goals, it puts driver operations logically
where they belong, in a driver, and it obviates the gymnastics of
DECLARE_TESTABLE() which just makes a mess of grepping for CXL symbols.

In other words, a driver callback is less of an ongoing maintenance burden
than this DECLARE_TESTABLE arrangement that does not scale and diminishes
the grep-ability of the codebase.

cxl_port_add_dport() moves mostly unmodified from drivers/cxl/core/port.c.
The only deliberate change is that it now assumes that the device_lock is
held on entry and the driver is attached (just like cxl_port_probe()).

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-6-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:41:29 -07:00
Dan Williams
86e756715d cxl/port: Move decoder setup before dport creation
There are port setup actions that run on first dport arrival, and there are
setup actions that run per dport.

RAS register setup is a future additional setup action to run per-port
(once the first dport arrives), and each dport also has RAS registers to
map.

Before adding that, flip the order of "first dport" and "per-dport"
actions. This makes allocation symmetric with teardown, "first dport"
actions unwind after last dport removed. It also allows for using a devres
group to collect the unrelated decoder, RAS, and dport setup actions into
one group release action.

The new cxl_port_open_group() collects "first dport" and "per-dport" into
one group that can be released on any failure. This group's lifetime only
needs to span the short duration of cxl_port_add_dport() to cleanup all
potential damage from failing to add a dport. Contrast that to the "dport"
devres group that is called upon to destruct fully formed dport objects.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-5-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:41:29 -07:00
Dan Williams
afa2bdba1e cxl/port: Cleanup dport removal with a devres group
In preparation for adding more setup actions like RAS register mapping,
introduce a devres group to collect all the dport creation / registration
actions. This replaces the maintenance tedium of open coding several
devm_release_action() calls in del_dport().

Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260131000403.2135324-4-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:41:29 -07:00
Dan Williams
83ccbaf1a1 cxl/port: Reduce number of @dport variables in cxl_port_add_dport()
In preparation for refactoring cxl_port_add_dport() to add RAS register
setup, cleanup the number of dport variables with a dport_exists() helper.

Kill the @dport needed to check for duplicates, rename @new_dport to
@dport.

Reported-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Closes: http://lore.kernel.org/20260116150119.00003bbd@huawei.com
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-3-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:41:29 -07:00
Dan Williams
47fec713d9 cxl/port: Cleanup handling of the nr_dports 0 -> 1 transition
There are multiple setup actions that can occur for a switch port after it
is known that it has at least one active downstream link. That work is
currently split between __devm_cxl_add_dport(), the add_dport() helper, and
cxl_port_add_dport() where decoder setup occurs.

Clean this up by moving all @dport object setup responsibilities into
add_dport() and all port effects into cxl_port_add_dport().

add_dport() handles taking a reference on @dport->dport_dev, and
cxl_port_add_dport() grows the awareness to setup the port component
registers. This removes an awkward open-coded xa_erase() from the middle of
__devm_cxl_add_dport() and instead tasks cxl_port_add_dport() with calling
the common @dport destruction path if anything goes wrong.

After this @port->nr_dports is always the count of @dports in the
@port->dports xarray, and cxl_dport_remove() is symmetric with add_dport().
With ->nr_dports now reliably tracking the number of dports the use of
ida_is_empty() can be dropped. Recall that the ida is only cleared on
"release" of decoder objects, and release can be arbitrarily delayed past
unregistration.

Lastly port->component_reg_phys is no longer reset to CXL_RESOURCE_NONE
post setup, no reason is seen to carry that forward.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260131000403.2135324-2-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-02-02 08:41:29 -07:00
Terry Bowman
9a8920ca8e cxl: Update RAS handler interfaces to also support CXL Ports
CXL PCIe Port Protocol Error handling support will be added to the
CXL drivers in the future. In preparation, rename the existing
interfaces to support handling all CXL PCIe Port Protocol Errors.

The driver's RAS support functions currently rely on a 'struct
cxl_dev_state' type parameter, which is not available for CXL Port
devices. However, since the same CXL RAS capability structure is
needed across most CXL components and devices, a common handling
approach should be adopted.

To accommodate this, update the __cxl_handle_cor_ras() and
__cxl_handle_ras() functions to use a `struct device` instead of
`struct cxl_dev_state`.

No functional changes are introduced.

[1] CXL 3.1 Spec, 8.2.4 CXL.cache and CXL.mem Registers

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-18-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Dan Williams
f953b7d5e1 cxl/mem: Clarify @host for devm_cxl_add_nvdimm()
The convention for devm_ helpers in the CXL driver is that the first
argument is the @host for the operation (locked driver::probe() context).

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-17-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
fda78d8481 PCI/AER: Update struct aer_err_info with kernel-doc formatting
Update the existing 'struct aer_err_info' definition to use kernel-doc
formatting. Remove the inline comments to reduce noise and do not introduce
functional changes. This will improve readability and maintainability.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-16-terry.bowman@amd.com
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
83cba5b31e PCI/AER: Report CXL or PCIe bus type in AER trace logging
The AER service driver and aer_event tracing currently log 'PCIe Bus Type'
for all errors. Update the driver and aer_event tracing to log 'CXL Bus
Type' for CXL device errors.

This requires that AER can identify and distinguish between PCIe errors and
CXL errors.

Introduce boolean 'is_cxl' to 'struct aer_err_info'. Add assignment in
aer_get_device_error_info() and pci_print_aer().

Update the aer_event trace routine to accept a bus type string parameter.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-15-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
da71bd360d PCI/AER: Use guard() in cxl_rch_handle_error_iter()
cxl_rch_handle_error_iter() includes a call to device_lock() using a goto
for multiple return paths. Improve readability and maintainability by
using the guard() lock variant.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260114182055.46029-13-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
59010029fa PCI/AER: Move CXL RCH error handling to aer_cxl_rch.c
The Restricted CXL Host (RCH) AER error handling logic currently resides
in the AER driver file, aer.c. CXL specific changes conditionally compiled
using #ifdefs.

Improve the AER driver maintainability by separating the RCH specific logic
from the AER driver's core functionality and removing the ifdefs. Introduce
drivers/pci/pcie/aer_cxl_rch.c for moving the RCH AER logic into. Conditionally
compile the file using the CONFIG_CXL_RCH_RAS Kconfig.

Move the CXL logic into the new file but leave CXL helper function
is_internal_error() in aer.c for now as it will be moved in future patch
for CXL Virtual Hierarchy handling.

To maintain compilation after the move other changes are required. Change
cxl_rch_handle_error(), cxl_rch_enable_rcec(), and is_internal_error() to
be non-static inorder for accessing from the AER driver.

Update the new file with the SPDX and 2023 AMD copyright notations because
the RCH bits were initially contributed in 2023 by AMD. See commit:
commit 0a867568bb ("PCI/AER: Forward RCH downstream port-detected errors to the CXL.mem dev handler")

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-12-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
51ce56b1a5 PCI/AER: Update is_internal_error() to be non-static is_aer_internal_error()
The AER driver includes significant logic for handling CXL protocol errors.
The AER driver will be updated in the future to separate the AER and CXL
logic.

Rename the is_internal_error() function to is_aer_internal_error() as it
gives a more precise indication of the purpose. Make
is_aer_internal_error() non-static to allow for the 2 different CXL
topology error model implementations (RCH and VH) to share this helper.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Link: https://patch.msgid.link/20260114182055.46029-11-terry.bowman@amd.com
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
6dc5fe212e PCI/AER: Export pci_aer_unmask_internal_errors()
Internal PCIe errors are not enabled by default during initialization
because their behavior is too device-specific and there is no standard way
to reason about them. However, for CXL an internal error is the standard
mechanism for conveying CXL protocol errors.

Export pci_aer_unmask_internal_errors() for CXL, but make it clear that
they are only meant for CXL and the status quo for leaving them masked for
PCIe in general remains.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-10-terry.bowman@amd.com
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Terry Bowman
0ff60f2ec3 cxl/pci: Move CXL driver's RCH error handling into core/ras_rch.c
Restricted CXL Host (RCH) protocol error handling uses a procedure distinct
from the CXL Virtual Hierarchy (VH) handling. This is because of the
differences in the RCH and VH topologies. Improve the maintainability and
add ability to enable/disable RCH handling.

Move and combine the RCH handling code into a single block conditionally
compiled with the CONFIG_CXL_RCH_RAS kernel config.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-9-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:07:04 -07:00
Dan Williams
d18f1b7bea PCI/AER: Replace PCIEAER_CXL symbol with CXL_RAS
One of the primary reasons for the CXL driver to exist is to perform error
handling. If both PCIEAER and CXL are enabled then light up CXL error
handling as well. Now that all RAS handling is moved under the CXL_RAS
symbol, drop the previous PCIEAER_CXL symbol.

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-14-terry.bowman@amd.com
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 15:06:54 -07:00
Dave Jiang
7ff8b1d608 cxl/pci: Remove CXL VH handling in CONFIG_PCIEAER_CXL conditional blocks from core/pci.c
Create new config CONFIG_CXL_RAS and put all CXL RAS items behind the
config. The config will depend on CPER and PCIE AER to build. Move the
related VH RAS code from core/pci.c to core/ras.c.

Restricted CXL host (RCH) RAS functions will be moved in a future patch.

Cc: Robert Richter <rrichter@amd.com>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Co-developed-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-8-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:58:03 -07:00
Terry Bowman
bcfa289932 PCI: Replace cxl_error_is_native() with pcie_aer_is_native()
The AER driver includes a CXL support function cxl_error_is_native(). This
function adds no additional value from pcie_aer_is_native().

Simplify the codebase by removing cxl_error_is_native() and replace
occurrences of cxl_error_is_native() with pcie_aer_is_native().

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260114182055.46029-7-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:57:42 -07:00
Terry Bowman
eb78ef4d6f cxl/pci: Remove unnecessary CXL RCH handling helper functions
cxl_handle_rdport_cor_ras() and cxl_handle_rdport_ras() are specific
to Restricted CXL Host (RCH) handling. Improve readability and
maintainability by replacing these and instead using the common
cxl_handle_cor_ras() and cxl_handle_ras() functions.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-6-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:57:10 -07:00
Terry Bowman
ca3d1a53e6 cxl/pci: Remove unnecessary CXL Endpoint handling helper functions
The CXL driver's cxl_handle_endpoint_cor_ras()/cxl_handle_endpoint_ras()
are unnecessary helper functions used only for Endpoints. Remove these
functions as they are not common for all CXL devices and do not provide
value for EP handling.

Rename __cxl_handle_ras to cxl_handle_ras() and __cxl_handle_cor_ras()
to cxl_handle_cor_ras().

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20260114182055.46029-5-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:56:25 -07:00
Terry Bowman
7c29ba0221 PCI: Introduce pcie_is_cxl()
CXL is a protocol that runs on top of PCIe electricals. Its error model
also runs on top of the PCIe AER error model by standardizing "internal"
errors as "CXL" errors. Linux has historically ignored internal errors.

CXL protocol error handling is then a task of enhancing the PCIe AER
core to understand that PCIe ports (upstream and downstream) and
endpoints may throw internal errors that represent standard CXL protocol
errors.

The proposed method to make that determination is to teach 'struct
pci_dev' to cache when its link has trained the CXL.mem and/or CXL.cache
protocols and then treat all internal errors as CXL errors. A design
goal is to not burden the PCIe AER core with CXL knowledge beyond just
enough to forward error notifications to the CXL RAS core. The forwarded
notification looks up a 'struct cxl_port' or 'struct cxl_dport'
companion device to the PCI device.

Introduce set_pcie_cxl() with logic checking for CXL.mem or CXL.cache
status in the CXL Flex Bus DVSEC status register. The CXL Flex Bus DVSEC
presence is used because it is required for all the CXL PCIe devices.[1]

[1] CXL 3.1 Spec, 8.1.1 PCIe Designated Vendor-Specific Extended
    Capability (DVSEC) ID Assignment, Table 8-2

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260114182055.46029-4-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:55:27 -07:00
Terry Bowman
6612bd9ff0 PCI: Update CXL DVSEC definitions
CXL DVSEC definitions were recently moved into uapi/pci_regs.h, but the
newly added macros do not follow the file's existing naming conventions.
The current format uses CXL_DVSEC_XYZ, while the new CXL entries must
instead use the PCI_DVSEC_CXL_XYZ prefix to match the conventions already
established in pci_regs.h.

The new CXL DVSEC macros also introduce _MASK and _OFFSET suffixes, which
are not used anywhere else in the file. These suffixes lengthen the
identifiers and reduce readability. Remove _MASK and _OFFSET from the
recently added definitions.

Additionally, remove PCI_DVSEC_HEADER1_LENGTH, as it duplicates the existing
PCI_DVSEC_HEADER1_LEN() macro.

Update all existing references to use the new macro names.

Finally, update the inline documentation to reference the latest revision
of the CXL specification.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260114182055.46029-3-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:52:23 -07:00
Terry Bowman
0f7afd80d8 PCI: Move CXL DVSEC definitions into uapi/linux/pci_regs.h
The CXL DVSECs are currently defined in cxl/core/cxlpci.h. These are not
accessible to other subsystems. Move these to uapi/linux/pci_regs.h.

The CXL DVSEC definitions will be renamed and reformatted to fit better
with existing defines.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260114182055.46029-2-terry.bowman@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-01-22 14:50:16 -07:00
Linus Torvalds
0f61b1860c Linux 6.19-rc5 v6.19-rc5 2026-01-11 17:03:14 -10:00
Linus Torvalds
7143203341 Crypto library fixes for v6.19-rc5
- A couple more fixes for the lib/crypto KUnit tests
 
 - Fix missing MMU protection for the AES S-box
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Merge tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull crypto library fixes from Eric Biggers:

 - A couple more fixes for the lib/crypto KUnit tests

 - Fix missing MMU protection for the AES S-box

* tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  lib/crypto: aes: Fix missing MMU protection for AES S-box
  MAINTAINERS: add test vector generation scripts to "CRYPTO LIBRARY"
  lib/crypto: tests: Fix syntax error for old python versions
  lib/crypto: tests: polyval_kunit: Increase iterations for preparekey in IRQs
2026-01-11 15:07:56 -10:00
Linus Torvalds
9c7ef209cd Char/Misc driver fixes for 6.19-rc5
Here are some small char/misc driver fixes for some reported issues.
 Included in here is:
   - much reported rust_binder fix
   - counter driver fixes
   - new device ids for the mei driver
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some small char/misc driver fixes for some reported issues.
  Included in here is:

   - much reported rust_binder fix

   - counter driver fixes

   - new device ids for the mei driver

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  rust_binder: remove spin_lock() in rust_shrink_free_page()
  mei: me: add nova lake point S DID
  counter: 104-quad-8: Fix incorrect return value in IRQ handler
  counter: interrupt-cnt: Drop IRQF_NO_THREAD flag
2026-01-11 07:27:44 -10:00
Linus Torvalds
316a94cb63 Disable GCOV instrumentation in the SEV noinstr.c collection
of SEV noinstr methods, to further robustify the code.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fix from Ingo Molnar:
 "Disable GCOV instrumentation in the SEV noinstr.c collection of SEV
  noinstr methods, to further robustify the code"

* tag 'x86-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sev: Disable GCOV on noinstr object
2026-01-11 07:19:43 -10:00
Linus Torvalds
fac4bdbaca Fix a crash in sched_mm_cid_after_execve().
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Ingo Molnar:
 "Fix a crash in sched_mm_cid_after_execve()"

* tag 'sched-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/mm_cid: Prevent NULL mm dereference in sched_mm_cid_after_execve()
2026-01-11 07:11:53 -10:00
Linus Torvalds
fe948326e9 Fix perf swevent hrtimer deinit regression.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf event fix from Ingo Molnar:
 "Fix perf swevent hrtimer deinit regression"

* tag 'perf-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Ensure swevent hrtimer is properly destroyed
2026-01-11 06:55:27 -10:00
Linus Torvalds
88730166f3 Misc irqchip fixes:
- Fix an endianness bug in the gic-v5 irqchip driver
  - Revert a broken commit from the riscv-imsic irqchip driver
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'irq-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull misc irqchip fixes from Ingo Molnar:

 - Fix an endianness bug in the gic-v5 irqchip driver

 - Revert a broken commit from the riscv-imsic irqchip driver

* tag 'irq-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "irqchip/riscv-imsic: Embed the vector array in lpriv"
  irqchip/gic-v5: Fix gicv5_its_map_event() ITTE read endianness
2026-01-11 06:36:20 -10:00
Thomas Gleixner
2e4b28c48f treewide: Update email address
In a vain attempt to consolidate the email zoo switch everything to the
kernel.org account.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-01-11 06:09:11 -10:00
Linus Torvalds
755bc1335e RISC-V updates for v6.19-rc5
- Fix CONFIG_RELOCATABLE=y boots by building Image files from vmlinux,
   rather than vmlinux.unstripped, now that the .modinfo section is
   included in vmlinux.unstripped.
 
 - Prevent branch predictor poisoning microarchitectural attacks that
   use the syscall index as a vector by using array_index_nospec() to
   clamp the index after the bounds check (as x86 and ARM64 already
   do).
 
 - Fix a crash in test_kprobes when building with Clang.
 
 - Fix a deadlock possible when tracing is enabled for SBI ecalls.
 
 - Fix the definition of the Zk standard RISC-V ISA extension bundle,
   which was missing the Zknh extension.
 
 - A few other miscellaneous non-functional cleanups, removing unused
   macros, fixing an out-of-date path in code comments, resolving a
   compile-time warning for a type mismatch in a pr_crit(), and removing
   an unnecessary header file inclusion.
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Merge tag 'riscv-for-linus-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Paul Walmsley:
 "Notable changes include a fix to close one common microarchitectural
  attack vector for out-of-order cores. Another patch exposed an
  omission in my boot test coverage, which is currently missing
  relocatable kernels. Otherwise, the fixes seem to be settling down for
  us.

   - Fix CONFIG_RELOCATABLE=y boots by building Image files from
     vmlinux, rather than vmlinux.unstripped, now that the .modinfo
     section is included in vmlinux.unstripped

   - Prevent branch predictor poisoning microarchitectural attacks that
     use the syscall index as a vector by using array_index_nospec() to
     clamp the index after the bounds check (as x86 and ARM64 already
     do)

   - Fix a crash in test_kprobes when building with Clang

   - Fix a deadlock possible when tracing is enabled for SBI ecalls

   - Fix the definition of the Zk standard RISC-V ISA extension bundle,
     which was missing the Zknh extension

   - A few other miscellaneous non-functional cleanups, removing unused
     macros, fixing an out-of-date path in code comments, resolving a
     compile-time warning for a type mismatch in a pr_crit(), and
     removing an unnecessary header file inclusion"

* tag 'riscv-for-linus-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: trace: fix snapshot deadlock with sbi ecall
  riscv: remove irqflags.h inclusion in asm/bitops.h
  riscv: cpu_ops_sbi: smp_processor_id() returns int, not unsigned int
  riscv: configs: Clean up references to non-existing configs
  riscv: kexec_image: Fix dead link to boot-image-header.rst
  riscv: pgtable: Cleanup useless VA_USER_XXX definitions
  riscv: cpufeature: Fix Zk bundled extension missing Zknh
  riscv: fix KUnit test_kprobes crash when building with Clang
  riscv: Sanitize syscall table indexing under speculation
  riscv: boot: Always make Image from vmlinux, not vmlinux.unstripped
2026-01-10 15:54:41 -10:00
Linus Torvalds
0fa27899e0 Driver core fixes for 6.19-rc5
- Fix swapped example values for the `family` and `machine` attributes
   in the sysfs SoC bus ABI documentation.
 
 - Fix Rust build and intra-doc issues when optional subsystems
   (CONFIG_PCI, CONFIG_AUXILIARY_BUS, CONFIG_PRINTK) are disabled.
 
 - Fix typos and incorrect safety comments in Rust PCI, DMA, and device
   ID documentation.
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Merge tag 'driver-core-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Pull driver core fixes from Danilo Krummrich:

 - Fix swapped example values for the `family` and `machine` attributes
   in the sysfs SoC bus ABI documentation

 - Fix Rust build and intra-doc issues when optional subsystems
   (CONFIG_PCI, CONFIG_AUXILIARY_BUS, CONFIG_PRINTK) are disabled

 - Fix typos and incorrect safety comments in Rust PCI, DMA, and
   device ID documentation

* tag 'driver-core-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
  rust: device: Remove explicit import of CStrExt
  rust: pci: fix typos in Bar struct's comments
  rust: device: fix broken intra-doc links
  rust: dma: fix broken intra-doc links
  rust: driver: fix broken intra-doc links to example driver types
  rust: device_id: replace incorrect word in safety documentation
  rust: dma: remove incorrect safety documentation
  docs: ABI: sysfs-devices-soc: Fix swapped sample values
2026-01-10 15:04:04 -10:00
Linus Torvalds
b061fcffe3 linux_kselftest-fixes-6.19-rc5
Fixes tracing test_multiple_writes stalls when buffer_size_kb is less
 than 12KB.
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Merge tag 'linux_kselftest-fixes-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest fix from Shuah Khan:
 "Fix tracing test_multiple_writes stalls when buffer_size_kb is less
  than 12KB"

* tag 'linux_kselftest-fixes-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests/tracing: Fix test_multiple_writes stall
2026-01-10 14:57:55 -10:00
Linus Torvalds
97313d6113 IOMU Fixes for Linux v6.19-rc4
Including:
 
 	- Generic IO-Page-Table code:
 	  - Several Kconfig-related build fixes
 	  - Fix for when gcc 8.5 on PPC refuses to inline a function from a
 	    header file.
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Merge tag 'iommu-fixes-v6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux

Pull iomu fixes from Joerg Roedel:

 - several Kconfig-related build fixes

 - fix for when gcc 8.5 on PPC refuses to inline a function from a
   header file

* tag 'iommu-fixes-v6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux:
  iommupt: Make pt_feature() always_inline
  iommufd/selftest: Prevent module/builtin conflicts in kconfig
  iommufd/selftest: Add missing kconfig for DMA_SHARED_BUFFER
  iommupt: Fix the kunit building
2026-01-10 07:14:40 -10:00
Gao Xiang
7893cc1225 erofs: fix file-backed mounts no longer working on EROFS partitions
Sheng Yong reported [1] that Android APEX images didn't work with commit
072a7c7cdb ("erofs: don't bother with s_stack_depth increasing for
now") because "EROFS-formatted APEX file images can be stored within an
EROFS-formatted Android system partition."

In response, I sent a quick fat-fingered [PATCH v3] to address the
report.  Unfortunately, the updated condition was incorrect:

         if (erofs_is_fileio_mode(sbi)) {
-            sb->s_stack_depth =
-                file_inode(sbi->dif0.file)->i_sb->s_stack_depth + 1;
-            if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
-                erofs_err(sb, "maximum fs stacking depth exceeded");
+            inode = file_inode(sbi->dif0.file);
+            if ((inode->i_sb->s_op == &erofs_sops && !sb->s_bdev) ||
+                inode->i_sb->s_stack_depth) {

The condition `!sb->s_bdev` is always true for all file-backed EROFS
mounts, making the check effectively a no-op.

The real fix tested and confirmed by Sheng Yong [2] at that time was
[PATCH v3 RESEND], which correctly ensures the following EROFS^2 setup
works:
    EROFS (on a block device) + EROFS (file-backed mount)

But sadly I screwed it up again by upstreaming the outdated [PATCH v3].

This patch applies the same logic as the delta between the upstream
[PATCH v3] and the real fix [PATCH v3 RESEND].

Reported-by: Sheng Yong <shengyong1@xiaomi.com>
Closes: https://lore.kernel.org/r/3acec686-4020-4609-aee4-5dae7b9b0093@gmail.com [1]
Fixes: 072a7c7cdb ("erofs: don't bother with s_stack_depth increasing for now")
Link: https://lore.kernel.org/r/243f57b8-246f-47e7-9fb1-27a771e8e9e8@gmail.com [2]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-01-10 06:39:20 -10:00
Jason Gunthorpe
6a3d5fda2c iommupt: Make pt_feature() always_inline
gcc 8.5 on powerpc does not automatically inline these functions even
though they evaluate to constants in key cases. Since the constant
propagation is essential for some code elimination and built-time checks
this causes a build failure:

 ERROR: modpost: "__pt_no_sw_bit" [drivers/iommu/generic_pt/fmt/iommu_amdv1.ko] undefined!

Caused by this:

	if (pts_feature(&pts, PT_FEAT_DMA_INCOHERENT) &&
	    !pt_test_sw_bit_acquire(&pts,
				    SW_BIT_CACHE_FLUSH_DONE))
		flush_writes_item(&pts);

Where pts_feature() evaluates to a constant false. Mark them as
__always_inline to force it to evaluate to a constant and trigger the code
elimination.

Fixes: 7c5b184db7 ("genpt: Generic Page Table base API")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512230720.9y9DtWIo-lkp@intel.com/
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2026-01-10 10:50:45 +01:00
Jason Gunthorpe
7adfd68274 iommufd/selftest: Prevent module/builtin conflicts in kconfig
The selftest now depends on the AMDv1 page table, however the selftest
kconfig itself is just an sub-option of the main IOMMUFD module kconfig.

This means it cannot be modular and so kconfig allowed a modular
IOMMU_PT_AMDV1 with a built in IOMMUFD. This causes link failures:

   ld: vmlinux.o: in function `mock_domain_alloc_pgtable.isra.0':
   selftest.c:(.text+0x12e8ad3): undefined reference to `pt_iommu_amdv1_init'
   ld: vmlinux.o: in function `BSWAP_SHUFB_CTL':
   sha1-avx2-asm.o:(.rodata+0xaa36a8): undefined reference to `pt_iommu_amdv1_read_and_clear_dirty'
   ld: sha1-avx2-asm.o:(.rodata+0xaa36f0): undefined reference to `pt_iommu_amdv1_map_pages'
   ld: sha1-avx2-asm.o:(.rodata+0xaa36f8): undefined reference to `pt_iommu_amdv1_unmap_pages'
   ld: sha1-avx2-asm.o:(.rodata+0xaa3720): undefined reference to `pt_iommu_amdv1_iova_to_phys'

Adjust the kconfig to disable IOMMUFD_TEST if IOMMU_PT_AMDV1 is incompatible.

Fixes: e93d5945ed ("iommufd: Change the selftest to use iommupt instead of xarray")
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512210135.freQWpxa-lkp@intel.com/
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2026-01-10 10:40:58 +01:00
Jason Gunthorpe
faa37ff3bf iommufd/selftest: Add missing kconfig for DMA_SHARED_BUFFER
The test doesn't build without it, dma-buf.h does not provide stub
functions if it is not enabled. Compilation can fail with:

 ERROR:root:ld: vmlinux.o: in function `iommufd_test':
 (.text+0x3b1cdd): undefined reference to `dma_buf_get'
 ld: (.text+0x3b1d08): undefined reference to `dma_buf_put'
 ld: (.text+0x3b2105): undefined reference to `dma_buf_export'
 ld: (.text+0x3b211f): undefined reference to `dma_buf_fd'
 ld: (.text+0x3b2e47): undefined reference to `dma_buf_move_notify'

Add the missing select.

Fixes: d2041f1f11 ("iommufd/selftest: Add some tests for the dmabuf flow")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2026-01-10 10:40:58 +01:00
Jason Gunthorpe
cefd81e76a iommupt: Fix the kunit building
The kunit doesn't work since the below commit made GENERIC_PT
unselectable:

 $ make ARCH=x86_64 O=build_kunit_x86_64 olddefconfig
 ERROR:root:Not all Kconfig options selected in kunitconfig were in the generated .config.
 This is probably due to unsatisfied dependencies.
 Missing: CONFIG_DEBUG_GENERIC_PT=y, CONFIG_IOMMUFD_TEST=y,
 CONFIG_IOMMU_PT_X86_64=y, CONFIG_GENERIC_PT=y, CONFIG_IOMMU_PT_AMDV1=y,
 CONFIG_IOMMU_PT_VTDSS=y, CONFIG_IOMMU_PT=y, CONFIG_IOMMU_PT_KUNIT_TEST=y

Also remove the unneeded CONFIG_IOMMUFD_TEST reference as the iommupt kunit
doesn't interact with iommufd, and it doesn't currently build for the
kunit due problems with DMA_SHARED buffer either.

Fixes: 01569c216d ("genpt: Make GENERIC_PT invisible")
Fixes: 1dd4187f53 ("iommupt: Add a kunit test for Generic Page Table")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2026-01-10 10:40:57 +01:00
Linus Torvalds
b6151c4e60 Change since last update:
- Don't bother with s_stack_depth increasing to band-aid
    regressions in some composefs mount setups (EROFS + ovl^2)
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Merge tag 'erofs-for-6.19-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs fix from Gao Xiang:

 - Don't increase s_stack_depth which caused regressions in some
   composefs mount setups (EROFS + ovl^2)

   Instead just allow one extra unaccounted fs stacking level for
   straightforward cases.

* tag 'erofs-for-6.19-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: don't bother with s_stack_depth increasing for now
2026-01-09 19:34:50 -10:00
Gao Xiang
072a7c7cdb erofs: don't bother with s_stack_depth increasing for now
Previously, commit d53cd891f0 ("erofs: limit the level of fs stacking
for file-backed mounts") bumped `s_stack_depth` by one to avoid kernel
stack overflow when stacking an unlimited number of EROFS on top of
each other.

This fix breaks composefs mounts, which need EROFS+ovl^2 sometimes
(and such setups are already used in production for quite a long time).

One way to fix this regression is to bump FILESYSTEM_MAX_STACK_DEPTH
from 2 to 3, but proving that this is safe in general is a high bar.

After a long discussion on GitHub issues [1] about possible solutions,
one conclusion is that there is no need to support nesting file-backed
EROFS mounts on stacked filesystems, because there is always the option
to use loopback devices as a fallback.

As a quick fix for the composefs regression for this cycle, instead of
bumping `s_stack_depth` for file backed EROFS mounts, we disallow
nesting file-backed EROFS over EROFS and over filesystems with
`s_stack_depth` > 0.

This works for all known file-backed mount use cases (composefs,
containerd, and Android APEX for some Android vendors), and the fix is
self-contained.

Essentially, we are allowing one extra unaccounted fs stacking level of
EROFS below stacking filesystems, but EROFS can only be used in the read
path (i.e. overlayfs lower layers), which typically has much lower stack
usage than the write path.

We can consider increasing FILESYSTEM_MAX_STACK_DEPTH later, after more
stack usage analysis or using alternative approaches, such as splitting
the `s_stack_depth` limitation according to different combinations of
stacking.

Fixes: d53cd891f0 ("erofs: limit the level of fs stacking for file-backed mounts")
Reported-and-tested-by: Dusty Mabe <dusty@dustymabe.com>
Reported-by: Timothée Ravier <tim@siosm.fr>
Closes: https://github.com/coreos/fedora-coreos-tracker/issues/2087 [1]
Reported-by: "Alekséi Naidénov" <an@digitaltide.io>
Closes: https://lore.kernel.org/r/CAFHtUiYv4+=+JP_-JjARWjo6OwcvBj1wtYN=z0QXwCpec9sXtg@mail.gmail.com
Acked-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Alexander Larsson <alexl@redhat.com>
Reviewed-and-tested-by: Sheng Yong <shengyong1@xiaomi.com>
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2026-01-10 13:01:15 +08:00
Linus Torvalds
cb2076b091 block-6.19-20260109
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Merge tag 'block-6.19-20260109' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

Pull block fixes from Jens Axboe:

 - Kill unlikely checks for blk-rq-qos. These checks are really
   all-or-nothing, either the branch is taken all the time, or it's not.
   Depending on the configuration, either one of those cases may be
   true. Just remove the annotation

 - Fix for merging bios with different app tags set

 - Fix for a recently introduced slowdown due to RCU synchronization

 - Fix for a status change on loop while it's in use, and then a later
   fix for that fix

 - Fix for the async partition scanning in ublk

* tag 'block-6.19-20260109' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  ublk: fix use-after-free in ublk_partition_scan_work
  blk-mq: avoid stall during boot due to synchronize_rcu_expedited
  loop: add missing bd_abort_claiming in loop_set_status
  block: don't merge bios with different app_tags
  blk-rq-qos: Remove unlikely() hints from QoS checks
  loop: don't change loop device under exclusive opener in loop_set_status
2026-01-09 15:42:46 -10:00
Linus Torvalds
68ad2095ca io_uring-6.19-20260109
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Merge tag 'io_uring-6.19-20260109' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

Pull io_uring fixes from Jens Axboe:
 "A single fix for a regression introduced in 6.15, where a failure to
  wake up idle io-wq workers at ring exit will wait for the timeout to
  expire.

  This isn't normally noticeable, as the exit is async.

  But if a parent task created a thread that sets up a ring and uses
  requests that cause io-wq threads to be created, and the parent task
  then waits for the thread to exit, then it can take 5 seconds for that
  pthread_join() to succeed as the child thread is waiting for its
  children to exit.

  On top of that, just a basic cleanup as well"

* tag 'io_uring-6.19-20260109' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  io_uring/io-wq: remove io_wq_for_each_worker() return value
  io_uring/io-wq: fix incorrect io_wq_for_each_worker() termination logic
2026-01-09 15:21:15 -10:00
Linus Torvalds
e28ddd0b7a arm64 fixes:
- Do not return false if !preemptible() in current_in_efi(). EFI
    runtime services can now run with preemption enabled
 
  - Fix uninitialised variable in the arm MPAM driver, reported by sparse
 
  - Fix partial kasan_reset_tag() use in change_memory_common() when
    calculating page indices or comparing ranges
 
  - Save/restore TCR2_EL1 during suspend/resume, otherwise the E0POE bit
    is lost
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Do not return false if !preemptible() in current_in_efi(). EFI
   runtime services can now run with preemption enabled

 - Fix uninitialised variable in the arm MPAM driver, reported by sparse

 - Fix partial kasan_reset_tag() use in change_memory_common() when
   calculating page indices or comparing ranges

 - Save/restore TCR2_EL1 during suspend/resume, otherwise the E0POE bit
   is lost

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Fix cleared E0POE bit after cpu_suspend()/resume()
  arm64: mm: Fix incomplete tag reset in change_memory_common()
  arm_mpam: Stop using uninitialized variables in __ris_msmon_read()
  arm64/efi: Don't fail check current_in_efi() if preemptible
2026-01-09 15:17:48 -10:00
Linus Torvalds
e55feea3a0 soc: fixes for 6.19
The main code change is a revert of the Raspberry Pi RP1 overlay
 support that was decided to not be ready.
 
 The other fixes are all for devicetree sources:
 
  - ethernet configuration on ixp42x-actiontec-mi424wr is
    board revision specific
 
  - validation warning fixes for imx27/imx51/imx6, hikey960 and k3
 
  - Minor corrections across imx8 boards, addressing all types of
    issues with interrups, dma, ethernet and clock settings, all
    simple one-line changes.
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Merge tag 'soc-fixes-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull SoC fixes from Arnd Bergmann:
 "The main code change is a revert of the Raspberry Pi RP1 overlay
  support that was decided to not be ready.

  The other fixes are all for devicetree sources:

   - ethernet configuration on ixp42x-actiontec-mi424wr is board
     revision specific

   - validation warning fixes for imx27/imx51/imx6, hikey960 and k3

   - Minor corrections across imx8 boards, addressing all types of
     issues with interrups, dma, ethernet and clock settings, all simple
     one-line changes"

* tag 'soc-fixes-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (25 commits)
  arm64: dts: hisilicon: hikey960: Drop "snps,gctl-reset-quirk" and "snps,tx_de_emphasis*" properties
  Documentation/process: maintainer-soc: Mark 'make' as commands
  Documentation/process: maintainer-soc: Be more explicit about defconfig
  arm64: dts: mba8mx: Fix Ethernet PHY IRQ support
  arm64: dts: imx8qm-ss-dma: correct the dma channels of lpuart
  arm64: dts: imx8mp: Fix LAN8740Ai PHY reference clock on DH electronics i.MX8M Plus DHCOM
  arm64: dts: freescale: tx8p-ml81: fix eqos nvmem-cells
  arm64: dts: freescale: moduline-display: fix compatible
  dt-bindings: arm: fsl: moduline-display: fix compatible
  ARM: dts: imx6q-ba16: fix RTC interrupt level
  arm64: dts: freescale: imx95-toradex-smarc: fix SMARC_SDIO_WP label position
  arm64: dts: freescale: imx95-toradex-smarc: use edge trigger for ethphy1 interrupt
  arm64: dts: add off-on-delay-us for usdhc2 regulator
  arm64: dts: imx8qm-mek: correct the light sensor interrupt type to low level
  ARM: dts: nxp: imx: Fix mc13xxx LED node names
  arm64: dts: imx95: correct I3C2 pclk to IMX95_CLK_BUSWAKEUP
  MAINTAINERS: Fix a linusw mail address
  arm64: dts: broadcom: rp1: drop RP1 overlay
  arm64: dts: broadcom: bcm2712: fix RP1 endpoint PCI topology
  misc: rp1: drop overlay support
  ...
2026-01-09 15:11:45 -10:00
Linus Torvalds
4621c338d3 A bunch of libceph fixes split evenly between memory safety and
implementation correctness issues (all marked for stable) and a change
 in maintainers for CephFS: Slava and Alex have formally taken over
 Xiubo's role.
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Merge tag 'ceph-for-6.19-rc5' of https://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
 "A bunch of libceph fixes split evenly between memory safety and
  implementation correctness issues (all marked for stable) and a change
  in maintainers for CephFS: Slava and Alex have formally taken over
  Xiubo's role"

* tag 'ceph-for-6.19-rc5' of https://github.com/ceph/ceph-client:
  libceph: make calc_target() set t->paused, not just clear it
  libceph: reset sparse-read state in osd_fault()
  libceph: return the handler error from mon_handle_auth_done()
  libceph: make free_choose_arg_map() resilient to partial allocation
  ceph: update co-maintainers list in MAINTAINERS
  libceph: replace overzealous BUG_ON in osdmap_apply_incremental()
  libceph: prevent potential out-of-bounds reads in handle_auth_done()
2026-01-09 15:05:19 -10:00