- Set max OPP during resume so DBI register accesses don't fail with NoC
errors (Qiang Yu)
- Add pci_host_common_d3cold_possible() to determine whether downstream
devices are already in D3hot and wakeup-enabled devices are capable of
generating PME from D3cold (Krishna Chaitanya Chundru)
- Add a .get_ltssm() callback to get the LTSSM status without DBI, since
DBI may be inaccessible after PME_Turn_Off (Krishna Chaitanya Chundru)
- Power down PHY via PARF_PHY_CTRL before disabling rails/clocks to avoid
power leakage (Krishna Chaitanya Chundru)
- Decide whether suspend should put the link in L2 and power down using
pci_host_common_d3cold_possible() instead of checking whether ASPM L1 is
enabled (Krishna Chaitanya Chundru)
- Add qcom D3cold support to tear down interconnect bandwidth and OPP votes
(Krishna Chaitanya Chundru)
- Handle unsupported mixed PERST#/PHY DT configurations, e.g., PHY in RP
node while PERST# is in the RC node, but warn about the DT issue (Qiang
Yu)
- Add pcie_encode_t_power_on() to encode L1SS T_POWER_ON fields (Krishna
Chaitanya Chundru)
- Add dw_pcie_program_t_power_on() to program T_POWER_ON (Krishna Chaitanya
Chundru)
- Program qcom T_POWER_ON based on DT 't-power-on-us' property in case
hardware advertises incorrect values (Krishna Chaitanya Chundru)
- Disable ASPM L0s for SA8775P (Shawn Guo)
- Initialize DWC MSI lock for firmware-managed ECAM hosts, which don't use
the dw_pcie_host_init() path that initializes the lock (Yadu M G)
* pci/controller/dwc-qcom:
PCI: qcom: Initialize DWC MSI lock for firmware-managed ECAM hosts
PCI: qcom: Disable ASPM L0s for SA8775P
PCI: qcom: Program T_POWER_ON
PCI: dwc: Add dw_pcie_program_t_power_on() to program T_POWER_ON
PCI/ASPM: Add pcie_encode_t_power_on() helper to encode L1SS T_POWER_ON fields
PCI: qcom: Handle mixed PERST#/PHY DT configuration
PCI: qcom: Add D3cold support
PCI: dwc: Use common D3cold eligibility helper in suspend path
PCI: qcom: Power down PHY via PARF_PHY_CTRL before disabling rails/clocks
PCI: qcom: Add .get_ltssm() callback to query LTSSM status
PCI: host-common: Add pci_host_common_d3cold_possible() helper
PCI: qcom: Set max OPP before DBI access during resume
# Conflicts:
# drivers/pci/controller/pci-host-common.c
- Enable clock before PHY init for correct ordering (Florian Eckert)
- Add .start_link() callback so the driver works again (Florian Eckert)
- Stop overwriting the ATU base address discovered by
dw_pcie_get_resources() (Florian Eckert)
- Add DT 'atu' region since this is hardware-specific, and fall back to
driver default if lacking (Florian Eckert)
* pci/controller/dwc-intel-gw:
dt-bindings: PCI: intel,lgm-pcie: Add 'atu' resource
PCI: intel-gw: Fix ATU base address setup and add optional DT 'atu' region
PCI: intel-gw: Add .start_link() callback
PCI: intel-gw: Enable clock before PHY init
PCI: intel-gw: Move interrupt enable to own function
PCI: intel-gw: Remove unused PCIE_APP_INTX_OFST definition
- Move IMX6SX_GPR12_PCIE_TEST_POWERDOWN handling into the core reset
functions (Richard Zhu)
- Add pci_host_common_parse_ports() for use by any native driver to parse
Root Port properties (currently only reset GPIOs) (Sherry Sun)
- Assert PERST# before enabling regulators to ensure that even if power is
enabled, endpoint stays inactive until REFCLK is stable (Sherry Sun)
- Parse reset properties in Root Port nodes (falling back to host bridge)
to help support Key E connectors and the pwrctrl framework (Sherry Sun)
- Configure i.MX95 REF_USE_PAD before PHY reset (Richard Zhu)
- Assert i.MX95 ref_clk_en after reference clock stabilizes (Richard Zhu)
- Integrate new pwrctrl API for DTs with Root Port-level power supplies
(Sherry Sun)
* pci/controller/dwc-imx6:
PCI: imx6: Integrate new pwrctrl API
PCI: imx6: Assert ref_clk_en after reference clock stabilizes on i.MX95
PCI: imx6: Configure REF_USE_PAD before PHY reset for i.MX95
PCI: imx6: Parse 'reset-gpios' in Root Port nodes
PCI: imx6: Assert PERST# before enabling regulators
PCI: host-generic: Add common helpers for parsing Root Port properties
dt-bindings: PCI: fsl,imx6q-pcie: Add reset GPIO in Root Port node
PCI: imx6: Fix IMX6SX_GPR12_PCIE_TEST_POWERDOWN handling
- Assert PERST# on shutdown so any connected Endpoints are held in reset
during shutdown (Sai Krishna Musham)
* pci/controller/dwc-amd-mdb:
PCI: amd-mdb: Assert PERST# on shutdown
- Apply ECRC TLP Digest workaround for all DesignWare cores prior to 5.10a,
not just 4.90a and 5.00a (Manikanta Maddireddy)
- Use common struct dw_pcie 'mode' rather than duplicating it in artpec6,
dra7xx, dwc-pcie, and keembay driver structs (Hans Zhang)
- Use DEFINE_SHOW_ATTRIBUTE for ltssm_status debugfs to reduce boilerplate
and fix a seq_file memory leak by including a .release() callback (Hans
Zhang)
- Fix a signedness bug in fault injection test code (Dan Carpenter)
- Avoid NULL pointer dereference when tearing down debugfs for controller
that lacks RAS DES capability (Shuvam Pandey)
* pci/controller/dwc:
PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability
PCI: dwc: Fix signedness bug in fault injection test code
PCI: dwc: Use DEFINE_SHOW_ATTRIBUTE for ltssm_status debugfs
PCI: keembay: Use common mode field in struct dw_pcie
PCI: dwc: Use common mode field in struct dw_pcie
PCI: artpec6: Use common mode field in struct dw_pcie
PCI: dra7xx: Use common mode field in struct dw_pcie
PCI: dwc: Apply ECRC workaround for DesignWare cores prior to 5.10a
- Do not dispose of the parent IRQ mapping, which belongs to the parent
interrupt controller (Mahesh Vaidya)
- Fix chained IRQ handler ordering issue and resource leaks on probe
failure (Mahesh Vaidya)
* pci/controller/altera:
PCI: altera: Fix resource leaks on probe failure
PCI: altera: Do not dispose parent IRQ mapping
- Request bus reassignment when not probe-only to fix an enumeration
regression on Marvell CN106XX and possibly other DT-based systems
(Ratheesh Kannoth)
* pci/controller/host-common:
PCI: host-common: Request bus reassignment when not probe-only
- Add endpoint controller APIs for use by function drivers to discover
auxiliary blocks like DMA engines (Koichiro Den)
- Remember DesignWare eDMA engine base/size and expose them via the EPC
aux-resource API (Koichiro Den)
- Refactor endpoint doorbell allocation to allow non-MSI doorbells
(Koichiro Den)
- Add endpoint embedded doorbell fallback, used if MSI allocation fails
(Koichiro Den)
- Validate BAR index and remove dead BAR read in endpoint doorbell test
(Carlos Bilbao)
- Unwind MSI/MSI-X vectors if NTB initialization fails part-way through
(Koichiro Den)
- Cache sleepable pci_irq_vector() value at ISR setup to avoid calling it
from hardirq context (Koichiro Den)
- Validate doorbell count when configuring NTB and vNTB doorbells
(Manivannan Sadhasivam)
- Call sleepable pci_epc_raise_irq() from a work item instead of atomic
context, e.g., when setting bits in NTB peer doorbells in the
ntb_peer_db_set() path (Koichiro Den)
- Report 0-based vNTB doorbell vector to account for link event 0 and
historically skipped slot 1 (Koichiro Den)
- Reject unusable vNTB doorbell counts, e.g., if they don't allow space for
link event 0 and historically skipped slot 1 (Koichiro Den)
- Prevent configfs writes to vNTB db_count and other values that are
already in use after EPC attach (Koichiro Den)
- Account for vNTB db_valid reserved slots (link event 0 and historically
skipped slot 1) so they don't appear as valid doorbells (Koichiro Den)
- Implement vNTB .db_vector_count()/mask() for doorbells so clients can use
multiple vectors and avoid thundering herds (Koichiro Den)
- Report 0-based NTB doorbell vector to account for link event 0 and
historically skipped slot 1 (Koichiro Den)
- Fix doorbell bitmask and IRQ vector handling to clear only specified
bits, use the correct vector for non-contiguous Linux IRQ numbers, and
validate incoming vectors (Koichiro Den)
- Implement NTB .db_vector_count()/mask() for doorbells so clients can use
multiple vectors (Koichiro Den)
* pci/endpoint:
NTB: epf: Implement .db_vector_count()/mask() for doorbells
NTB: epf: Fix doorbell bitmask and IRQ vector handling
NTB: epf: Report 0-based doorbell vector via ntb_db_event()
NTB: epf: Make db_valid_mask cover only real doorbell bits
NTB: epf: Document legacy doorbell slot offset in ntb_epf_peer_db_set()
PCI: endpoint: pci-epf-vntb: Implement .db_vector_count()/mask() for doorbells
PCI: endpoint: pci-epf-vntb: Exclude reserved slots from db_valid_mask
PCI: endpoint: pci-epf-vntb: Guard configfs writes after EPC attach
PCI: endpoint: pci-epf-vntb: Reject unusable doorbell counts
PCI: endpoint: pci-epf-vntb: Report 0-based doorbell vector via ntb_db_event()
PCI: endpoint: pci-epf-vntb: Defer pci_epc_raise_irq() out of atomic context
PCI: endpoint: pci-epf-vntb: Document legacy MSI doorbell offset
PCI: endpoint: pci-epf-ntb: Add check to detect 'db_count' value of 0
PCI: endpoint: pci-epf-vntb: Add check to detect 'db_count' value of 0
NTB: epf: Avoid calling pci_irq_vector() from hardirq context
NTB: epf: Fix request_irq() unwind in ntb_epf_init_isr()
misc: pci_endpoint_test: Remove dead BAR read before doorbell trigger
misc: pci_endpoint_test: Validate BAR index in doorbell test
PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback
PCI: endpoint: pci-epf-test: Reuse pre-exposed doorbell targets
PCI: endpoint: pci-epf-vntb: Reuse pre-exposed doorbells and IRQ flags
PCI: endpoint: pci-ep-msi: Refactor doorbell allocation for new backends
PCI: dwc: ep: Expose integrated eDMA resources via EPC aux-resource API
PCI: dwc: Record integrated eDMA register window
PCI: endpoint: Add auxiliary resource query API
- Avoid FLR for MediaTek MT7925 WiFi, where FLR fails after a VM terminates
uncleanly (Jose Ignacio Tornos Martinez)
- Avoid SBR for Qualcomm WCN6855/WCN7850 WiFi, SDX62/SDX65 modems, which
seem not to support it correctly (Jose Ignacio Tornos Martinez)
* pci/virtualization:
PCI: Avoid SBR for Qualcomm WCN6855/WCN7850 WiFi, SDX62/SDX65 modems
PCI: Avoid FLR for MediaTek MT7925 WiFi
- Require CAP_SYS_ADMIN to write to sysfs 'resourceN_resize' attributes
(Krzysztof Wilczyński)
- Convert PCI resource files to static attributes to avoid races that cause
'duplicate filename' warnings and boot panics (Krzysztof Wilczyński)
- Remove pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files(),
which are obsolete after converting to static attributes (Krzysztof
Wilczyński)
- Add security_locked_down(LOCKDOWN_PCI_ACCESS) to alpha PCI resource mmap
path to match the generic path (Krzysztof Wilczyński)
- Convert sysfs 'legacy_io' and 'legacy_mem' to static attributes
(Krzysztof Wilczyński)
- Remove pci_create_legacy_files() and pci_sysfs_init(), which are obsolete
after converting to static attributes (Krzysztof Wilczyński)
- Expose sysfs 'resourceN_resize' attributes only on platforms with PCI
mmap (Krzysztof Wilczyński)
- Use kstrtobool() to parse the 'rom' attribute input to avoid the
unexpected behavior of enabling the ROM when writing '0' with no trailing
newline (Krzysztof Wilczyński)
* pci/sysfs:
PCI/sysfs: Use kstrtobool() to parse the ROM attribute input
PCI/sysfs: Limit BAR resize attribute scope to platforms with PCI mmap
PCI/sysfs: Remove pci_create_legacy_files() and pci_sysfs_init()
PCI/sysfs: Convert legacy I/O and memory attributes to static definitions
PCI/sysfs: Add __weak pci_legacy_has_sparse() helper
alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range()
PCI: Add macros for legacy I/O and memory address space sizes
PCI/sysfs: Remove pci_{create,remove}_sysfs_dev_files()
alpha/PCI: Convert resource files to static attributes
alpha/PCI: Add static PCI resource attribute macros
alpha/PCI: Remove WARN from __pci_mmap_fits() and __legacy_mmap_fits()
alpha/PCI: Fix __pci_mmap_fits() overflow for zero-length BARs
alpha/PCI: Use PCI resource accessor macros
alpha/PCI: Use BAR index in sysfs attr->private instead of resource pointer
alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
PCI/sysfs: Limit pci_sysfs_init() late_initcall compile scope
PCI/sysfs: Add stubs for pci_{create,remove}_sysfs_dev_files()
PCI/sysfs: Warn about BAR resize failure in __resource_resize_store()
PCI/sysfs: Convert PCI resource files to static attributes
PCI/sysfs: Add static PCI resource attribute macros
PCI/sysfs: Add CAP_SYS_ADMIN check to __resource_resize_store()
PCI/sysfs: Split pci_llseek_resource() for device and legacy attributes
PCI/sysfs: Only allow supported resource types in I/O and MMIO helpers
PCI: Add pci_resource_is_io() and pci_resource_is_mem() helpers
PCI/sysfs: Use PCI resource accessor macros
- Check option ROM header signatures and lengths before accessing to avoid
page faults and alignment faults (Guixin Liu)
* pci/rom:
PCI: Check ROM header and data structure addr before accessing
PCI: Introduce named defines for PCI ROM
- Log device readiness timeouts as errors, not warnings (Bjorn Helgaas)
- Wait for device readiness after soft reset (D3hot -> D0uninitialized
transition), when the device may respond with Request Retry Status if it
needs more time to initialize (Bjorn Helgaas)
- Drop unnecessary retries when restoring BARs (Lukas Wunner)
* pci/reset:
PCI: Drop unnecessary retries when restoring BARs
PCI: Wait for device readiness after D3hot -> D0uninitialized transition
PCI: Log device readiness timeouts as errors
- Don't try to power on/off devices unless we know they actually support
power control (Manivannan Sadhasivam)
* pci/pwrctrl:
PCI/pwrctrl: Lock device when calling device_is_bound()
PCI/pwrctrl: Do not try to power on/off devices that don't need pwrctrl
PCI/pwrctrl: Move pci_pwrctrl_is_required() earlier in file
- Fix race between pci_proc_init() and pci_bus_add_device() (Krzysztof
Wilczyński)
* pci/procfs:
PCI/proc: Fix race between pci_proc_init() and pci_bus_add_device()
- Set power state to 'unknown' for all devices, not just those with
drivers, during suspend (Lukas Wunner)
- Skip restoring Resizable BARs and VF Resizable BARs if device doesn't
respond to config reads, to avoid invalid array accesses (Marco
Nenciarini)
- Add pci_suspend_retains_context() so drivers can tell whether devices may
be reset while resuming from suspend due to platform issues; use this in
nvme to avoid issues on Qcom RCs (Manivannan Sadhasivam)
* pci/pm:
nvme-pci: Use pci_suspend_retains_context() during suspend
PCI: qcom: Indicate broken L1SS exit during resume from system suspend
PCI: Indicate context lost if L1SS exit is broken during resume from system suspend
PCI: Add pci_suspend_retains_context() to check if device state is preserved during suspend
PCI/IOV: Skip VF Resizable BAR restore on read error
PCI: Skip Resizable BAR restore on read error
PCI: Stop setting cached power state to 'unknown' on unbind
- Prevent P2PDMA as well as CPU access to non-mappable BARs, e.g., s390 ISM
BARs (Matt Evans)
- Add Intel QAT, DSA, IAA devices to whitelist (Lukas Wunner)
* pci/p2pdma:
PCI/P2PDMA: Add Intel QAT, DSA, IAA devices to whitelist
PCI/P2PDMA: Avoid returning a provider for non_mappable_bars
- Remove MPS/MRRS Kconfig settings (CONFIG_PCIE_BUS_*) that worked around a
WiFi device defect (Bjorn Helgaas)
- Always lift 2.5GT/s restriction in PCIe failed link retraining to avoid
clamping a link to 2.5GT/s after hot-plug changes the device (Maciej W.
Rozycki)
- Don't bother trying to retrain a 2.5GT/s link at 2.5GT/s since nothing
would be gained by the retrain (Maciej W. Rozycki)
* pci/enumeration:
PCI: Bail out early for 2.5GT/s devices in PCIe failed link retraining
PCI: Use pcie_get_speed_cap() in PCIe failed link retraining
PCI: Always lift 2.5GT/s restriction in PCIe failed link retraining
PCI: Remove MPS/MRRS Kconfig settings (CONFIG_PCIE_BUS_*)
- Don't reconfigure ASPM when entering low-power state; only do it
when returning back to D0 (Carlos Bilbao)
* pci/aspm:
PCI/ASPM: Don't reconfigure ASPM entering low-power state
pci_write_rom() controls access to the ROM content through the
corresponding sysfs attribute, and treats the input as a request to
disable only when it matches the string "0\n" exactly:
if ((off == 0) && (*buf == '0') && (count == 2))
The count == 2 condition encodes the trailing newline that echo(1) appends.
This was found when userspace wrote "0" without a trailing newline aiming
to disable access, which failed to match the condition above and enabled
access instead. For example:
$ echo 0 > rom # "0\n", count 2, access disabled
$ echo -n 0 > rom # "0", count 1, access enabled
$ echo > rom # "", count 1, access enabled (likely not desirable)
Parse the input with kstrtobool(), which handles common boolean inputs such
as "0", "1", "n", "y" or "off", "on", with or without a trailing newline,
so both of the above disable access, and update the now stale comment.
As a side effect, input that does not parse as a boolean is rejected with
-EINVAL rather than enabling access. The documented "0" and "1" continue
to work as before, and rejecting malformed input brings the attribute in
line with how sysfs attributes typically handle it.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260612182448.552406-1-kwilczynski@kernel.org
Currently, __resource_resize_store() uses sysfs_remove_groups() and
sysfs_create_groups() on pci_dev_resource_attr_groups to tear down and
recreate the resourceN files after a BAR resize, so the updated BAR sizes
are visible in sysfs.
The resourceN files only exist on platforms that define HAVE_PCI_MMAP or
ARCH_GENERIC_PCI_MMAP_RESOURCE. On platforms that define neither,
pci_dev_resource_attr_groups is NULL and the sysfs_remove_groups() and
sysfs_create_groups() calls in __resource_resize_store() become no-ops.
Resizable BAR (ReBAR) is a PCI Express Extended Capability
(PCI_EXT_CAP_ID_REBAR) that requires PCIe extended config space. Every
PCIe-capable architecture defines HAVE_PCI_MMAP or
ARCH_GENERIC_PCI_MMAP_RESOURCE (via arch headers or the asm-generic/pci.h
fallback). Architectures without either only support conventional PCI and
cannot have any ReBAR-capable devices.
Move the resize show and store helpers, the per-BAR attribute definitions,
and the attribute group behind the existing #ifdef HAVE_PCI_MMAP ||
ARCH_GENERIC_PCI_MMAP_RESOURCE guard, and fold the group reference in
pci_dev_groups[] into the existing #if block.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-25-kwilczynski@kernel.org
Currently, pci_create_legacy_files() and pci_remove_legacy_files() are
no-op stubs. With legacy attributes now handled by static groups
registered via pcibus_groups[], no call site needs them.
Remove both functions, their declarations, and the call sites in
pci_register_host_bridge(), pci_alloc_child_bus(), and pci_remove_bus().
Remove the pci_sysfs_init() late_initcall and sysfs_initialized. The
late_initcall originally existed to create all the dynamic PCI sysfs files,
but with both resource and legacy attributes now handled by static groups,
it is no longer needed.
Remove the legacy_io and legacy_mem fields from struct pci_bus which were
used to track the dynamically allocated legacy attributes.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-24-kwilczynski@kernel.org
Currently, legacy_io and legacy_mem are dynamically allocated and created
by pci_create_legacy_files(), with pci_adjust_legacy_attr() updating the
attributes at runtime on Alpha to rename them and shift the size for sparse
addressing.
Convert to four static const attributes (legacy_io, legacy_io_sparse,
legacy_mem, legacy_mem_sparse) with .is_bin_visible() callbacks that use
pci_legacy_has_sparse() to select the appropriate variant per bus. The
sizes are compile-time constants and .size is set directly on each
attribute.
Register the groups in pcibus_groups[] under a HAVE_PCI_LEGACY guard so the
driver model handles creation and removal automatically.
Stub out pci_create_legacy_files() and pci_remove_legacy_files() as the
dynamic creation is no longer needed. Remove the __weak
pci_adjust_legacy_attr(), Alpha's override, and its declaration from both
Alpha and PowerPC asm/pci.h headers.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-23-kwilczynski@kernel.org
Currently, Alpha's sparse/dense legacy attribute handling is done via
pci_adjust_legacy_attr(), which updates dynamically allocated attributes at
runtime. The upcoming conversion to static attributes needs a way to
determine sparse support at visibility check time.
Add a __weak pci_legacy_has_sparse() that returns false by default. Alpha
overrides it to check has_sparse() on the bus host controller.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-22-kwilczynski@kernel.org
Currently, pci_mmap_legacy_page_range() reads the legacy resource size from
bus->legacy_mem->size or bus->legacy_io->size. This couples the mmap
bounds check to the struct pci_bus fields that will be removed when legacy
attributes are converted to static definitions.
Compute the size directly using PCI_LEGACY_MEM_SIZE (0x100000) and
PCI_LEGACY_IO_SIZE (0xffff) macros, and shift by 5 bits for sparse systems.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-21-kwilczynski@kernel.org
Add defines for the standard PCI legacy address space sizes, replacing the
raw literals used by the legacy sysfs attributes.
Then, replace open-coded values with the newly added macros.
No functional changes intended.
Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-20-kwilczynski@kernel.org
Currently, pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files()
are no-op stubs. With both the generic and Alpha resource files now
handled by static attribute groups, no platform needs dynamic per-device
sysfs file creation.
Remove both functions, their declarations, and the call sites in
pci_bus_add_device() and pci_stop_dev().
Remove __weak pci_create_resource_files() and pci_remove_resource_files()
stubs and their declarations in pci.h, as no architecture overrides them
anymore.
Remove the res_attr[] and res_attr_wc[] fields from struct pci_dev which
were used to track dynamically allocated resource attributes.
Finally, simplify pci_sysfs_init() to only handle legacy file creation
under HAVE_PCI_LEGACY, removing the per-device loop and the
HAVE_PCI_SYSFS_INIT helper added earlier.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-19-kwilczynski@kernel.org
Previously, Alpha's PCI resource files (resourceN, resourceN_sparse,
resourceN_dense) were dynamically created by pci_create_resource_files(),
which overrides the generic __weak implementation. The previous code
allocated bin_attributes at runtime and managed them via the res_attr[] and
res_attr_wc[] fields in struct pci_dev.
Convert to static const attributes with three attribute groups (plain,
sparse, dense), each with an .is_bin_visible() callback that checks
resource length, has_sparse(), and sparse_mem_mmap_fits(). A .bin_size()
callback provides the resource size to the kernfs node, with the sparse
variant shifting by 5 bits for byte-level addressing.
Register the groups via ARCH_PCI_DEV_GROUPS so the driver model handles
creation and removal automatically.
Use the new pci_resource_is_mem() helper for the type check, replacing the
open-coded bitwise flag test.
Finally, remove pci_create_resource_files(), pci_remove_resource_files(),
pci_create_attr(), and pci_create_one_attr() which are no longer needed.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-18-kwilczynski@kernel.org
Add macros for declaring static binary attributes for Alpha's PCI resource
files:
- pci_dev_resource_attr(), for dense/BWX systems (mmap dense)
- pci_dev_resource_sparse_attr(), for sparse systems (mmap sparse)
- pci_dev_resource_dense_attr(), for dense companion files (mmap dense)
Each macro creates a const bin_attribute with the BAR index stored in the
.private property and the appropriate .mmap() callback.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-17-kwilczynski@kernel.org
Remove the WARN() that fires when userspace attempts to mmap beyond the BAR
bounds. The check still returns 0 to reject the mapping, but the warning
is excessive for normal operation.
A similar warning was removed from the PCI core in the commit 3b519e4ea6
("PCI: fix size checks for mmap() on /proc/bus/pci files").
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
[bhelgaas: squash https://lore.kernel.org/all/20260508045824.GA3160093@rocinante]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-16-kwilczynski@kernel.org
Currently, __pci_mmap_fits() computes the BAR size using
"pci_resource_len() - 1", which wraps to a large value when the BAR length
is zero, causing the bounds check to incorrectly succeed.
Add an early return for empty resources.
Fixes: 10a0ef39fb ("PCI/alpha: pci sysfs resources")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-15-kwilczynski@kernel.org
Replace direct pdev->resource[] accesses with pci_resource_n(), and
open-coded res->flags type checks with pci_resource_is_mem() and
pci_resource_start() helpers.
While at it, move the pci_resource_n() call directly into
pcibios_resource_to_bus() and drop the local struct resource pointer.
No functional changes intended.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-14-kwilczynski@kernel.org
Currently, Alpha's pci_create_one_attr() stores a resource pointer in
attr->private, and pci_mmap_resource() loops through all BARs to find
the matching index.
Store the BAR index directly in attr->private and retrieve the resource via
pci_resource_n(). This eliminates the loop and aligns with the convention
used by the generic PCI sysfs code.
The PCI core change was first added in the commit dca40b186b ("PCI: Use
BAR index in sysfs attr->private instead of resource pointer").
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-13-kwilczynski@kernel.org
Currently, Alpha's pci_mmap_resource() does not check
security_locked_down(LOCKDOWN_PCI_ACCESS) before allowing userspace to mmap
PCI BARs.
The generic version has had this check since commit eb627e1772 ("PCI:
Lock down BAR access when the kernel is locked down") to prevent DMA
attacks when the kernel is locked down.
Add the same check to Alpha's pci_mmap_resource().
Fixes: eb627e1772 ("PCI: Lock down BAR access when the kernel is locked down")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-12-kwilczynski@kernel.org
Currently, pci_sysfs_init() and sysfs_initialized compile unconditionally,
even on platforms where static attribute groups handle all resource file
creation.
Place them behind a new HAVE_PCI_SYSFS_INIT macro, especially as the
late_initcall is only needed when:
- HAVE_PCI_LEGACY is set, to iterate buses and create legacy I/O and
memory files.
- Neither HAVE_PCI_MMAP nor ARCH_GENERIC_PCI_MMAP_RESOURCE is set, to
iterate devices and create resource files via the __weak
pci_create_resource_files() stub override (this is how the Alpha
architecture handles this currently).
On most systems both conditions are false and the entire late_initcall
compiles away.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-11-kwilczynski@kernel.org
On platforms with HAVE_PCI_MMAP or ARCH_GENERIC_PCI_MMAP_RESOURCE, resource
files are now handled by static attribute groups registered via
pci_dev_groups[].
Stub out the pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files(),
as the dynamic resource file creation is no longer needed.
Also, simplify pci_sysfs_init() on these platforms to only iterate buses
for legacy attributes creation, skipping the per-device loop.
Move the __weak stubs for pci_create_resource_files() and
pci_remove_resource_files() into the #else branch since only platforms
without HAVE_PCI_MMAP (such as Alpha architecture) still need them. Guard
the res_attr[] and res_attr_wc[] fields in struct pci_dev the same way.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-10-kwilczynski@kernel.org
Add a pci_warn() to __resource_resize_store(), so that BAR resize failures
are visible to the user, which can help troubleshoot any potential resource
resize issues.
While at it, rename the resource_resize_is_visible() to
resource_resize_attr_is_visible() along with the corresponding group
variable to align with the naming convention used by the resource attribute
groups.
Also, change the order of pci_dev_groups[] such that the resize group is
now located alongside the other resource groups.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-9-kwilczynski@kernel.org
Currently, the PCI resource files (resourceN, resourceN_wc) are dynamically
created by pci_create_sysfs_dev_files(), called from both
pci_bus_add_device() and the pci_sysfs_init() late_initcall, with only a
sysfs_initialized flag for synchronisation. This has caused warnings and
boot panics when both paths race on the same device, e.g.:
sysfs: cannot create duplicate filename '/devices/pci0000:3c/0000:3c:01.0/0000:3e:00.2/resource2'
This is especially likely on Devicetree-based platforms, where the PCI host
controllers are platform drivers that probe via the driver model, which can
happen during or after the late_initcall. As such, pci_bus_add_device()
and pci_sysfs_init() are more likely to overlap.
Convert to static const attributes with three attribute groups (I/O, UC,
WC), each with an .is_bin_visible() callback that checks resource flags,
BAR length, and non_mappable_bars. A .bin_size() callback provides
pci_resource_len() to the kernfs node for correct stat and lseek behaviour.
As part of this conversion:
- Rename pci_read_resource_io() and pci_write_resource_io() to
pci_read_resource() and pci_write_resource() since the callbacks are no
longer I/O-specific in the static attribute context.
- Update __resource_resize_store() to use sysfs_create_groups() and
sysfs_remove_groups(), which re-evaluates visibility and runs the
.bin_size() callback for the static resource attribute groups.
- Remove pci_create_resource_files(), pci_remove_resource_files(), and
pci_create_attr() which are no longer needed.
- Move the __weak stubs outside the #if guard so they remain available
for callers converted in subsequent commits.
Platforms that do not define the HAVE_PCI_MMAP macro or the
ARCH_GENERIC_PCI_MMAP_RESOURCE macro, such as Alpha architecture,
continue using their platform-specific resource file creation.
For reference, the dynamic creation dates back to the pre-Git era:
https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/drivers/pci/pci-sysfs.c?id=42298be0eeb5ae98453b3374c36161b05a46c5dc
The write-combine support was added in commit 45aec1ae72 ("x86: PAT
export resource_wc in pci sysfs").
Many other reports mentioned in the cover letter (first Link: below).
Link: https://lore.kernel.org/r/20260508043543.217179-1-kwilczynski@kernel.org/
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215515
Closes: https://github.com/openwrt/openwrt/issues/17143
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-8-kwilczynski@kernel.org
pci_proc_attach_device() creates procfs entries for PCI devices and is
called from pci_bus_add_device(). It lazily creates the per-bus procfs
directory (bus->procdir) via proc_mkdir() on first use, and returns early
if proc_initialized is not yet set.
On x86 with ACPI, PCI enumeration occurs at subsys_initcall, before
pci_proc_init() sets proc_initialized at device_initcall. The
for_each_pci_dev() loop in pci_proc_init() then creates procfs entries for
these already-enumerated devices, but runs without holding
pci_rescan_remove_lock.
On ARM64 with devicetree, PCI host bridges probe at device_initcall. With
async probing enabled, pci_bus_add_device() can run concurrently with
pci_proc_init(), and both may call pci_proc_attach_device() for the same
device or for different devices on the same bus. As pci_host_probe() holds
pci_rescan_remove_lock while pci_proc_init() does not, there is no
serialisation between the two paths.
When two threads concurrently call pci_proc_attach_device() for devices on
the same bus, both observe bus->procdir as NULL and both call proc_mkdir().
The proc filesystem serialises directory creation internally, so only one
caller succeeds. The other results in a warning like:
proc_dir_entry '000c:00/00.0' already registered
The caller receives NULL (duplicate entry) and unconditionally stores it to
bus->procdir, corrupting the valid pointer set by the first caller.
Serialise access to proc_initialized, proc_bus_pci_dir, bus->procdir and
dev->procent with a new mutex local to drivers/pci/proc.c, and store the
created entries to bus->procdir and dev->procent only on success, so a
failed creation can never overwrite a valid pointer.
Additionally, wrap the for_each_pci_dev() loop in pci_proc_init() with
pci_lock_rescan_remove() to serialise against concurrent PCI bus
operations, add an early return in pci_proc_attach_device() when
dev->procent is already set to make the function idempotent, and clear
bus->procdir in pci_proc_detach_bus() to prevent use of a dangling pointer
after proc_remove().
Reported-by: Shuan He <heshuan@bytedance.com>
Closes: https://lore.kernel.org/linux-pci/20250702155112.40124-2-heshuan@bytedance.com/
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20260611150543.511422-1-kwilczynski@kernel.org
PCIe controller present in Eliza SoC is backwards compatible with the
controller present in SM8550 SoC. Hence, add the compatible with SM8550
fallback.
Eliza requires 6 reg entries, 8 clocks and 9 interrupts, so add the
corresponding allOf constraints.
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260608-eliza-v3-2-9bdeb7434b28@oss.qualcomm.com
Document the Renesas RZ/V2N PCIe host controller, which is compatible with
the RZ/G3E PCIe IP and therefore uses it as a fallback compatible. The
only difference is that it uses device ID 0x003B.
Make the binding title generic to avoid extending the title for each new
SoC, and update the description to list the supported SoCs and their
capabilities.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260501102407.29462-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Add dma-coherent as an allowed property in the SG2042 PCIe host controller
binding. SG2042's PCIe Root Complexes are cache-coherent with the CPU.
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260331171248.973014-2-gaohan@iscas.ac.cn
pci_resource_alignment() calculates resource alignment and should not alter
its input structs. Make its input parameters const.
It requires making also pci_cardbus_resource_alignment() input const.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260429122617.7324-9-ilpo.jarvinen@linux.intel.com
pci_sriov_resource_alignment() inputs struct pci_dev which it should not
need to alter to calculate alignment.
Make pci_dev pci_sriov_resource_alignment() inputs const. It requires
making pci_iov_resource_size() input const as well.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260429122617.7324-8-ilpo.jarvinen@linux.intel.com
Convert input pci_dev for pseries_get_iov_fw_value() and pnv_iov_get() to
const to be able to convert pcibios_iov_resource_alignment() as well in an
upcoming change.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260429122617.7324-7-ilpo.jarvinen@linux.intel.com
