kernel/linux.git/drivers/pci/bus.c, branch linux-4.16.y

Merge branch 'pci/spdx' into next

2018-02-01T17:40:07+00:00

* pci/spdx: PCI: Add SPDX GPL-2.0+ to replace implicit GPL v2 or later statement PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate PCI: Add SPDX GPL-2.0 to replace COPYING boilerplate PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate PCI: Add SPDX GPL-2.0 when no license was specified

PCI: Add SPDX GPL-2.0 when no license was specified

2018-01-26T17:45:16+00:00

b24413180f56 ("License cleanup: add SPDX GPL-2.0 license identifier to files with no license") added SPDX GPL-2.0 to several PCI files that previously contained no license information. Add SPDX GPL-2.0 to all other PCI files that did not contain any license information and hence were under the default GPL version 2 license of the kernel. Signed-off-by: Bjorn Helgaas Reviewed-by: Greg Kroah-Hartman

PCI: Add wrappers for dev_printk()

2018-01-18T18:55:24+00:00

Add PCI-specific dev_printk() wrappers and use them to simplify the code slightly. No functional change intended. Signed-off-by: Frederick Lawler [bhelgaas: squash into one patch] Signed-off-by: Bjorn Helgaas

PCI: Autosense device removal in pci_bridge_d3_update()

2016-11-18T00:44:56+00:00

The algorithm to update the flag indicating whether a bridge may go to D3 makes a few optimizations based on whether the update was caused by the removal of a device on the one hand, versus the addition of a device or the change of its D3cold flags on the other hand. The information whether the update pertains to a removal is currently passed in by the caller, but the function may as well determine that itself by examining the device in question, thereby allowing for a considerable simplification and reduction of the code. Out of several options to determine removal, I've chosen the function device_is_registered() because it's cheap: It merely returns the dev->kobj.state_in_sysfs flag. That flag is set through device_add() when the root bus is scanned and cleared through device_remove(). The call to pci_bridge_d3_update() happens after each of these calls, respectively, so the ordering is correct. No functional change intended. Tested-by: Mika Westerberg Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Reviewed-by: Rafael J. Wysocki

Merge branches 'pci/demodularize-hosts' and 'pci/host-request-windows' into next

2016-08-01T17:23:57+00:00

* pci/demodularize-hosts: PCI: xgene: Make explicitly non-modular PCI: thunder-pem: Make explicitly non-modular PCI: thunder-ecam: Make explicitly non-modular PCI: tegra: Make explicitly non-modular PCI: rcar-gen2: Make explicitly non-modular PCI: rcar: Make explicitly non-modular PCI: mvebu: Make explicitly non-modular PCI: layerscape: Make explicitly non-modular PCI: keystone: Make explicitly non-modular PCI: hisi: Make explicitly non-modular PCI: generic: Make explicitly non-modular PCI: designware-plat: Make it explicitly non-modular PCI: artpec6: Make explicitly non-modular PCI: armada8k: Make explicitly non-modular PCI: artpec: Add PCI_MSI_IRQ_DOMAIN dependency PCI: artpec: Add Axis ARTPEC-6 PCIe controller driver PCI: Add DT binding for Axis ARTPEC-6 PCIe controller PCI: generic: Select IRQ_DOMAIN * pci/host-request-windows: PCI: versatile: Simplify host bridge window iteration PCI: versatile: Request host bridge window resources with core function PCI: tegra: Request host bridge window resources with core function PCI: tegra: Remove top-level resource from hierarchy PCI: rcar: Simplify host bridge window iteration PCI: rcar: Request host bridge window resources with core function PCI: rcar Gen2: Request host bridge window resources PCI: rcar: Drop gen2 dummy I/O port region ARM: Make PCI I/O space optional PCI: mvebu: Request host bridge window resources with core function PCI: generic: Simplify host bridge window iteration PCI: generic: Request host bridge window resources with core function PCI: altera: Simplify host bridge window iteration PCI: altera: Request host bridge window resources with core function PCI: xilinx-nwl: Use dev_printk() when possible PCI: xilinx-nwl: Request host bridge window resources PCI: xilinx-nwl: Free bridge resource list on failure PCI: xilinx: Request host bridge window resources PCI: xilinx: Free bridge resource list on failure PCI: xgene: Request host bridge window resources PCI: xgene: Free bridge resource list on failure PCI: iproc: Request host bridge window resources PCI: designware: Simplify host bridge window iteration PCI: designware: Request host bridge window resources PCI: designware: Free bridge resource list on failure PCI: Add devm_request_pci_bus_resources()

PCI: Put PCIe ports into D3 during suspend

2016-06-13T19:57:36+00:00

Currently the Linux PCI core does not touch power state of PCI bridges and PCIe ports when system suspend is entered. Leaving them in D0 consumes power unnecessarily and may prevent the CPU from entering deeper C-states. With recent PCIe hardware we can power down the ports to save power given that we take into account few restrictions: - The PCIe port hardware is recent enough, starting from 2015. - Devices connected to PCIe ports are effectively in D3cold once the port is transitioned to D3 (the config space is not accessible anymore and the link may be powered down). - Devices behind the PCIe port need to be allowed to transition to D3cold and back. There is a way both drivers and userspace can forbid this. - If the device behind the PCIe port is capable of waking the system it needs to be able to do so from D3cold. This patch adds a new flag to struct pci_device called 'bridge_d3'. This flag is set and cleared by the PCI core whenever there is a change in power management state of any of the devices behind the PCIe port. When system later on is suspended we only need to check this flag and if it is true transition the port to D3 otherwise we leave it in D0. Also provide override mechanism via command line parameter "pcie_port_pm=[off|force]" that can be used to disable or enable the feature regardless of the BIOS manufacturing date. Tested-by: Lukas Wunner Signed-off-by: Mika Westerberg Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki

PCI: Add devm_request_pci_bus_resources()

2016-06-06T20:25:51+00:00

Several host bridge drivers iterate through the list of bridge windows to request resources. Several others don't request the window resources at all. Add a devm_request_pci_bus_resources() interface to make it easier for drivers to request all the window resources. Export to GPL modules (from Arnd Bergmann ). Signed-off-by: Bjorn Helgaas

PCI: Do not treat EPROBE_DEFER as device attach failure

2016-05-02T18:49:11+00:00

Linux 4.5 introduced a behavioral change in device probing during the suspend process with commit 013c074f8642 ("PM / sleep: prohibit devices probing during suspend/hibernation"): It defers device probing during the entire suspend process, starting from the prepare phase and ending with the complete phase. A rule existed before that "we rely on subsystems not to do any probing once a device is suspended" but it is enforced only now (Alan Stern, https://lkml.org/lkml/2015/9/15/908). This resulted in a WARN splat if a PCI device (e.g., Thunderbolt) is plugged in while the system is asleep: Upon waking up, pciehp_resume() discovers new devices in the resume phase and immediately tries to bind them to a driver. Since probing is now deferred, device_attach() returns -EPROBE_DEFER, which provoked a WARN in pci_bus_add_device(). Linux 4.6-rc1 aggravates the situation with commit ab1a187bba5c ("PCI: Check device_attach() return value always"): If device_attach() returns a negative value, pci_bus_add_device() now removes the sysfs and procfs entries for the device and pci_bus_add_devices() subsequently locks up with a BUG. Even with the BUG fixed we're still in trouble because the device remains on the deferred probing list even though its sysfs and procfs entries are gone and its children won't be added. Fix by not interpreting -EPROBE_DEFER as failure. The device will be probed eventually (through device_unblock_probing() in dpm_complete()) and there is proper locking in place to avoid races (e.g., if devices are unplugged again und thus deleted from the system before deferred probing happens, I have tested this). Also, those functions which dereference dev->driver (e.g. pci_pm_*()) do contain proper NULL pointer checks. So it seems safe to ignore -EPROBE_DEFER. Fixes: ab1a187bba5c ("PCI: Check device_attach() return value always") Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki Cc: Grygorii Strashko Cc: Alan Stern

PCI: Fix BUG on device attach failure

2016-05-02T18:48:25+00:00

Previously when pci_bus_add_device() called device_attach() and it returned a negative value, we emitted a WARN but carried on. Commit ab1a187bba5c ("PCI: Check device_attach() return value always"), introduced in Linux 4.6-rc1, changed this to unwind all steps preceding device_attach() and to not set dev->is_added = 1. The latter leads to a BUG if pci_bus_add_device() was called from pci_bus_add_devices(). Fix by not recursing to a child bus if device_attach() failed for the bridge leading to it. This can be triggered by plugging in a PCI device (e.g. Thunderbolt) while the system is asleep. The system locks up when woken because device_attach() returns -EPROBE_DEFER. Fixes: ab1a187bba5c ("PCI: Check device_attach() return value always") Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki

Merge tag 'powerpc-4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2016-03-19T22:38:41+00:00

Pull powerpc updates from Michael Ellerman: "This was delayed a day or two by some build-breakage on old toolchains which we've now fixed. There's two PCI commits both acked by Bjorn. There's one commit to mm/hugepage.c which is (co)authored by Kirill. Highlights: - Restructure Linux PTE on Book3S/64 to Radix format from Paul Mackerras - Book3s 64 MMU cleanup in preparation for Radix MMU from Aneesh Kumar K.V - Add POWER9 cputable entry from Michael Neuling - FPU/Altivec/VSX save/restore optimisations from Cyril Bur - Add support for new ftrace ABI on ppc64le from Torsten Duwe Various cleanups & minor fixes from: - Adam Buchbinder, Andrew Donnellan, Balbir Singh, Christophe Leroy, Cyril Bur, Luis Henriques, Madhavan Srinivasan, Pan Xinhui, Russell Currey, Sukadev Bhattiprolu, Suraj Jitindar Singh. General: - atomics: Allow architectures to define their own __atomic_op_* helpers from Boqun Feng - Implement atomic{, 64}_*_return_* variants and acquire/release/ relaxed variants for (cmp)xchg from Boqun Feng - Add powernv_defconfig from Jeremy Kerr - Fix BUG_ON() reporting in real mode from Balbir Singh - Add xmon command to dump OPAL msglog from Andrew Donnellan - Add xmon command to dump process/task similar to ps(1) from Douglas Miller - Clean up memory hotplug failure paths from David Gibson pci/eeh: - Redesign SR-IOV on PowerNV to give absolute isolation between VFs from Wei Yang. - EEH Support for SRIOV VFs from Wei Yang and Gavin Shan. - PCI/IOV: Rename and export virtfn_{add, remove} from Wei Yang - PCI: Add pcibios_bus_add_device() weak function from Wei Yang - MAINTAINERS: Update EEH details and maintainership from Russell Currey cxl: - Support added to the CXL driver for running on both bare-metal and hypervisor systems, from Christophe Lombard and Frederic Barrat. - Ignore probes for virtual afu pci devices from Vaibhav Jain perf: - Export Power8 generic and cache events to sysfs from Sukadev Bhattiprolu - hv-24x7: Fix usage with chip events, display change in counter values, display domain indices in sysfs, eliminate domain suffix in event names, from Sukadev Bhattiprolu Freescale: - Updates from Scott: "Highlights include 8xx optimizations, 32-bit checksum optimizations, 86xx consolidation, e5500/e6500 cpu hotplug, more fman and other dt bits, and minor fixes/cleanup" * tag 'powerpc-4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (179 commits) powerpc: Fix unrecoverable SLB miss during restore_math() powerpc/8xx: Fix do_mtspr_cpu6() build on older compilers powerpc/rcpm: Fix build break when SMP=n powerpc/book3e-64: Use hardcoded mttmr opcode powerpc/fsl/dts: Add "jedec,spi-nor" flash compatible powerpc/T104xRDB: add tdm riser card node to device tree powerpc32: PAGE_EXEC required for inittext powerpc/mpc85xx: Add pcsphy nodes to FManV3 device tree powerpc/mpc85xx: Add MDIO bus muxing support to the board device tree(s) powerpc/86xx: Introduce and use common dtsi powerpc/86xx: Update device tree powerpc/86xx: Move dts files to fsl directory powerpc/86xx: Switch to kconfig fragments approach powerpc/86xx: Update defconfigs powerpc/86xx: Consolidate common platform code powerpc32: Remove one insn in mulhdu powerpc32: small optimisation in flush_icache_range() powerpc: Simplify test in __dma_sync() powerpc32: move xxxxx_dcache_range() functions inline powerpc32: Remove clear_pages() and define clear_page() inline ...