kernel/linux.git/drivers/pci/hotplug, branch v6.19.11

PCI: Add WQ_PERCPU to alloc_workqueue() users

2026-02-26T23:01:04+00:00

[ Upstream commit 78f5d0d5a23dd81106cbe999d9dcd522964a8f1a ] Currently work items enqueued by schedule_delayed_work() use "system_wq" (a per-CPU wq), while queue_delayed_work() uses WORK_CPU_UNBOUND (used when a CPU is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistency cannot be addressed without refactoring the API. alloc_workqueue() treats all queues as per-CPU by default, while unbound workqueues must opt-in via WQ_UNBOUND. This default is suboptimal: most workloads benefit from unbound queues, allowing the scheduler to place worker threads where they're needed and reducing noise when CPUs are isolated. This continues the effort to refactor workqueue APIs, which began with the introduction of new workqueues and a new alloc_workqueue() flag in: 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq") 930c2ea566af ("workqueue: Add new WQ_PERCPU flag") Add WQ_PERCPU to explicitly request alloc_workqueue() to be per-CPU when WQ_UNBOUND has not been specified. With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND), any alloc_workqueue() caller that doesn't explicitly specify WQ_UNBOUND must now use WQ_PERCPU. Once migration is complete, WQ_UNBOUND can be removed and unbound will become the implicit default. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari [bhelgaas: squash similar commits] Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/20251107142526.234685-1-marco.crivellari@suse.com Link: https://patch.msgid.link/20251107142835.237636-1-marco.crivellari@suse.com Link: https://patch.msgid.link/20251107143108.240025-1-marco.crivellari@suse.com Link: https://patch.msgid.link/20251107143335.242342-1-marco.crivellari@suse.com Link: https://patch.msgid.link/20251107143624.244978-1-marco.crivellari@suse.com Stable-dep-of: 03f336a869b3 ("PCI: endpoint: Add missing NULL check for alloc_workqueue()") Signed-off-by: Sasha Levin

s390: Remove KMSG_COMPONENT macro

2025-11-24T10:45:21+00:00

The KMSG_COMPONENT macro is a leftover of the s390 specific "kernel message catalog" which never made it upstream. Remove the macro in order to get rid of a pointless indirection. Replace all users with the string it defines. In almost all cases this leads to a simple replacement like this: - #define KMSG_COMPONENT "appldata" - #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + #define pr_fmt(fmt) "appldata: " fmt Except for some special cases this is just mechanical/scripted work. Acked-by: Thomas Richter Signed-off-by: Heiko Carstens

PCI: hotplug: Clean up spaces in messages

2025-08-11T20:01:50+00:00

Remove extraneous space before newline in messages. Signed-off-by: Colin Ian King [bhelgaas: squash into one patch, commit log] Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/20250731100017.2165781-1-colin.i.king@gmail.com Link: https://patch.msgid.link/20250731101036.2167812-1-colin.i.king@gmail.com

Merge tag 'powerpc-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2025-08-04T02:15:04+00:00

Pull powerpc fixes from Madhavan Srinivasan: - Fixes for several issues in the powernv PCI hotplug path - Fix htmldoc generation for htm.rst in toctree - Add jit support for load_acquire and store_release in ppc64 bpf jit Thanks to Bjorn Helgaas, Hari Bathini, Puranjay Mohan, Saket Kumar Bhaskar, Shawn Anastasio, Timothy Pearson, and Vishal Parmar * tag 'powerpc-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc64/bpf: Add jit support for load_acquire and store_release docs: powerpc: add htm.rst to toctree PCI: pnv_php: Enable third attention indicator state PCI: pnv_php: Fix surprise plug detection and recovery powerpc/eeh: Make EEH driver device hotplug safe powerpc/eeh: Export eeh_unfreeze_pe() PCI: pnv_php: Work around switches with broken presence detection PCI: pnv_php: Clean up allocated IRQs on unplug

Merge tag 'pci-v6.17-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

2025-08-01T20:59:07+00:00

Pull PCI updates from Bjorn Helgaas: "Enumeration: - Allow built-in drivers, not just modular drivers, to use async initial probing (Lukas Wunner) - Support Immediate Readiness even on devices with no PM Capability (Sean Christopherson) - Consolidate definition of PCIE_RESET_CONFIG_WAIT_MS (100ms), the required delay between a reset and sending config requests to a device (Niklas Cassel) - Add pci_is_display() to check for "Display" base class and use it in ALSA hda, vfio, vga_switcheroo, vt-d (Mario Limonciello) - Allow 'isolated PCI functions' (multi-function devices without a function 0) for LoongArch, similar to s390 and jailhouse (Huacai Chen) Power control: - Add ability to enable optional slot clock for cases where the PCIe host controller and the slot are supplied by different clocks (Marek Vasut) PCIe native device hotplug: - Fix runtime PM ref imbalance on Hot-Plug Capable ports caused by misinterpreting a config read failure after a device has been removed (Lukas Wunner) - Avoid creating a useless PCIe port service device for pciehp if the slot is handled by the ACPI hotplug driver (Lukas Wunner) - Ignore ACPI hotplug slots when calculating depth of pciehp hotplug ports (Lukas Wunner) Virtualization: - Save VF resizable BAR state and restore it after reset (Michał Winiarski) - Allow IOV resources (VF BARs) to be resized (Michał Winiarski) - Add pci_iov_vf_bar_set_size() so drivers can control VF BAR size (Michał Winiarski) Endpoint framework: - Add RC-to-EP doorbell support using platform MSI controller, including a test case (Frank Li) - Allow BAR assignment via configfs so platforms have flexibility in determining BAR usage (Jerome Brunet) Native PCIe controller drivers: - Convert amazon,al-alpine-v[23]-pcie, apm,xgene-pcie, axis,artpec6-pcie, marvell,armada-3700-pcie, st,spear1340-pcie to DT schema format (Rob Herring) - Use dev_fwnode() instead of of_fwnode_handle() to remove OF dependency in altera (fixes an unused variable), designware-host, mediatek, mediatek-gen3, mobiveil, plda, xilinx, xilinx-dma, xilinx-nwl (Jiri Slaby, Arnd Bergmann) - Convert aardvark, altera, brcmstb, designware-host, iproc, mediatek, mediatek-gen3, mobiveil, plda, rcar-host, vmd, xilinx, xilinx-dma, xilinx-nwl from using pci_msi_create_irq_domain() to using msi_create_parent_irq_domain() instead; this makes the interrupt controller per-PCI device, allows dynamic allocation of vectors after initialization, and allows support of IMS (Nam Cao) APM X-Gene PCIe controller driver: - Rewrite MSI handling to MSI CPU affinity, drop useless CPU hotplug bits, use device-managed memory allocations, and clean things up (Marc Zyngier) - Probe xgene-msi as a standard platform driver rather than a subsys_initcall (Marc Zyngier) Broadcom STB PCIe controller driver: - Add optional DT 'num-lanes' property and if present, use it to override the Maximum Link Width advertised in Link Capabilities (Jim Quinlan) Cadence PCIe controller driver: - Use PCIe Message routing types from the PCI core rather than defining private ones (Hans Zhang) Freescale i.MX6 PCIe controller driver: - Add IMX8MQ_EP third 64-bit BAR in epc_features (Richard Zhu) - Add IMX8MM_EP and IMX8MP_EP fixed 256-byte BAR 4 in epc_features (Richard Zhu) - Configure LUT for MSI/IOMMU in Endpoint mode so Root Complex can trigger doorbel on Endpoint (Frank Li) - Remove apps_reset (LTSSM_EN) from imx_pcie_{assert,deassert}_core_reset(), which fixes a hotplug regression on i.MX8MM (Richard Zhu) - Delay Endpoint link start until configfs 'start' written (Richard Zhu) Intel VMD host bridge driver: - Add Intel Panther Lake (PTL)-H/P/U Vendor ID (George D Sworo) Qualcomm PCIe controller driver: - Add DT binding and driver support for SA8255p, which supports ECAM for Configuration Space access (Mayank Rana) - Update DT binding and driver to describe PHYs and per-Root Port resets in a Root Port stanza and deprecate describing them in the host bridge; this makes it possible to support multiple Root Ports in the future (Krishna Chaitanya Chundru) - Add Qualcomm QCS615 to SM8150 DT binding (Ziyue Zhang) - Add Qualcomm QCS8300 to SA8775p DT binding (Ziyue Zhang) - Drop TBU and ref clocks from Qualcomm SM8150 and SC8180x DT bindings (Konrad Dybcio) - Document 'link_down' reset in Qualcomm SA8775P DT binding (Ziyue Zhang) - Add required PCIE_RESET_CONFIG_WAIT_MS delay after Link up IRQ (Niklas Cassel) Rockchip PCIe controller driver: - Drop unused PCIe Message routing and code definitions (Hans Zhang) - Remove several unused header includes (Hans Zhang) - Use standard PCIe config register definitions instead of rockchip-specific redefinitions (Geraldo Nascimento) - Set Target Link Speed to 5.0 GT/s before retraining so we have a chance to train at a higher speed (Geraldo Nascimento) Rockchip DesignWare PCIe controller driver: - Prevent race between link training and register update via DBI by inhibiting link training after hot reset and link down (Wilfred Mallawa) - Add required PCIE_RESET_CONFIG_WAIT_MS delay after Link up IRQ (Niklas Cassel) Sophgo PCIe controller driver: - Add DT binding and driver for Sophgo SG2044 PCIe controller driver in Root Complex mode (Inochi Amaoto) Synopsys DesignWare PCIe controller driver: - Add required PCIE_RESET_CONFIG_WAIT_MS after waiting for Link up on Ports that support > 5.0 GT/s. Slower Ports still rely on the not-quite-correct PCIE_LINK_WAIT_SLEEP_MS 90ms default delay while waiting for the Link (Niklas Cassel)" * tag 'pci-v6.17-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (116 commits) dt-bindings: PCI: qcom,pcie-sa8775p: Document 'link_down' reset dt-bindings: PCI: Remove 83xx-512x-pci.txt dt-bindings: PCI: Convert amazon,al-alpine-v[23]-pcie to DT schema dt-bindings: PCI: Convert marvell,armada-3700-pcie to DT schema dt-bindings: PCI: Convert apm,xgene-pcie to DT schema dt-bindings: PCI: Convert axis,artpec6-pcie to DT schema dt-bindings: PCI: Convert st,spear1340-pcie to DT schema PCI: Move is_pciehp check out of pciehp_is_native() PCI: pciehp: Use is_pciehp instead of is_hotplug_bridge PCI/portdrv: Use is_pciehp instead of is_hotplug_bridge PCI/ACPI: Fix runtime PM ref imbalance on Hot-Plug Capable ports selftests: pci_endpoint: Add doorbell test case misc: pci_endpoint_test: Add doorbell test case PCI: endpoint: pci-epf-test: Add doorbell test support PCI: endpoint: Add pci_epf_align_inbound_addr() helper for inbound address alignment PCI: endpoint: pci-ep-msi: Add checks for MSI parent and mutability PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller PCI: dwc: Add Sophgo SG2044 PCIe controller driver in Root Complex mode PCI: vmd: Switch to msi_create_parent_irq_domain() PCI: vmd: Convert to lock guards ...

Merge branch 'pci/misc'

2025-07-31T21:12:19+00:00

- Remove resolved hotplug TODO item (Guilherme Giacomo Simoes) - Fix typos (Bjorn Helgaas) * pci/misc: PCI: Fix typos PCI: hotplug: Remove TODO about unused .get_power(), .hardware_test()

PCI: pciehp: Use is_pciehp instead of is_hotplug_bridge

2025-07-29T16:45:39+00:00

The PCIe hotplug driver calculates the depth of a nested hotplug port by looking at the is_hotplug_bridge flag. The depth is used as lockdep class to tell hotplug ports apart. The is_hotplug_bridge flag encompasses ACPI slots handled by the ACPI hotplug driver, hence the calculated depth may be too high. Avoid by checking the is_pciehp flag instead. This glitch likely has no user-visible impact: ACPI slots typically only exist at the Root Port level, not in nested hotplug hierarchies. Also, CONFIG_LOCKDEP is usually only used by developers. So this is just for the sake of correctness. Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/59a097376a2bb493da9efd66fb196ae4b66f8a09.1752390102.git.lukas@wunner.de

PCI: pnv_php: Enable third attention indicator state

2025-07-26T07:39:20+00:00

The PCIe specification allows three attention indicator states, on, off, and blink. Enable all three states instead of basic on / off control. This changes the userspace API (writes to the sysfs "attention" file) to match the behavior of pciehp. Here's the comparison of previous and new indicator behavior: Value Previous New Behavior ----- -------- ------------------------ 0 off (reserved, so undefined) 1 on on 2 on blink 3 on off Signed-off-by: Timothy Pearson [bhelgaas: add specifics of behavior change] Signed-off-by: Bjorn Helgaas Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/1210309411.1359866.1752615582001.JavaMail.zimbra@raptorengineeringinc.com

PCI: pnv_php: Fix surprise plug detection and recovery

2025-07-26T07:39:15+00:00

The existing PowerNV hotplug code did not handle surprise plug events correctly, leading to a complete failure of the hotplug system after device removal and a required reboot to detect new devices. This comes down to two issues: 1) When a device is surprise removed, often the bridge upstream port will cause a PE freeze on the PHB. If this freeze is not cleared, the MSI interrupts from the bridge hotplug notification logic will not be received by the kernel, stalling all plug events on all slots associated with the PE. 2) When a device is removed from a slot, regardless of surprise or programmatic removal, the associated PHB/PE ls left frozen. If this freeze is not cleared via a fundamental reset, skiboot is unable to clear the freeze and cannot retrain / rescan the slot. This also requires a reboot to clear the freeze and redetect the device in the slot. Issue the appropriate unfreeze and rescan commands on hotplug events, and don't oops on hotplug if pci_bus_to_OF_node() returns NULL. Signed-off-by: Timothy Pearson [bhelgaas: tidy comments] Signed-off-by: Bjorn Helgaas Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/171044224.1359864.1752615546988.JavaMail.zimbra@raptorengineeringinc.com

PCI: pnv_php: Work around switches with broken presence detection

2025-07-26T07:37:42+00:00

The Microsemi Switchtec PM8533 PFX 48xG3 [11f8:8533] PCIe switch system was observed to incorrectly assert the Presence Detect Set bit in its capabilities when tested on a Raptor Computing Systems Blackbird system, resulting in the hot insert path never attempting a rescan of the bus and any downstream devices not being re-detected. Work around this by additionally checking whether the PCIe data link is active or not when performing presence detection on downstream switches' ports, similar to the pciehp_hpc.c driver. Signed-off-by: Shawn Anastasio Signed-off-by: Timothy Pearson Signed-off-by: Bjorn Helgaas Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/505981576.1359853.1752615415117.JavaMail.zimbra@raptorengineeringinc.com