lwn.git/arch/tile/kernel/pci.c, branch docs-next

arch: remove tile port

2018-03-16T09:56:03+00:00

The Tile architecture port was added by Chris Metcalf in 2010, and maintained until early 2018 when he orphaned it due to his departure from Mellanox, and nobody else stepped up to maintain it. The product line is still around in the form of the BlueField SoC, but no longer uses the Tile architecture. There are also still products for sale with Tile-GX SoCs, notably the Mikrotik CCR router family. The products all use old (linux-3.3) kernels with lots of patches and won't be upgraded by their manufacturers. There have been efforts to port both OpenWRT and Debian to these, but both projects have stalled and are very unlikely to be continued in the future. Given that we are reasonably sure that nobody is still using the port with an upstream kernel any more, it seems better to remove it now while the port is in a good shape than to let it bitrot for a few years first. Cc: Chris Metcalf Cc: John Paul Adrian Glaubitz Link: http://www.mellanox.com/page/npu_multicore_overview Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/ Signed-off-by: Arnd Bergmann

Merge branch 'pci/resource' into next

2017-09-07T18:24:19+00:00

* pci/resource: microblaze/PCI: Remove pcibios_setup_bus_{self/devices} dead code ARC: Remove empty kernel/pcibios.c PCI: Add a generic weak pcibios_align_resource() PCI: Add a generic weak pcibios_fixup_bus()

tile/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks

2017-08-03T21:28:56+00:00

The pci_fixup_irqs() function allocates IRQs for all PCI devices present in a system; those PCI devices possibly belong to different PCI bus trees (and possibly rooted at different host bridges) and may well be enabled (ie probed and bound to a driver) by the time pci_fixup_irqs() is called when probing a given host bridge driver. Furthermore, current kernel code relying on pci_fixup_irqs() to assign legacy PCI IRQs to devices does not work at all for hotplugged devices in that the code carrying out the IRQ fixup is called at host bridge driver probe time, which just cannot take into account devices hotplugged after the system has booted. The introduction of map/swizzle function hooks in struct pci_host_bridge allows us to define per-bridge map/swizzle functions that can be used at device probe time in PCI core code to allocate IRQs for a given device (through pci_assign_irq()). Convert PCI host bridge initialization code to the pci_scan_root_bus_bridge() API (that allows to pass a struct pci_host_bridge with initializedmap/swizzle pointers) and remove the pci_fixup_irqs() call from arch code. Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Cc: Chris Metcalf

PCI: Add a generic weak pcibios_align_resource()

2017-08-02T19:53:16+00:00

Multiple architectures define this as a trivial function, and I'm adding another one as part of the RISC-V port. Add a __weak version of pcibios_align_resource() and delete the now-obselete ones in a handful of ports. The only functional change should be that a handful of ports used to export pcibios_fixup_bus(). Only some architectures export this, so I just dropped it. Signed-off-by: Palmer Dabbelt Signed-off-by: Bjorn Helgaas

PCI: Add a generic weak pcibios_fixup_bus()

2017-08-02T19:43:38+00:00

Multiple architectures define this as an empty function, and I'm adding another one as part of the RISC-V port. Add a __weak version of pcibios_fixup_bus() and delete the now-obselete ones in a handful of ports. The only functional change should be that microblaze used to export pcibios_fixup_bus(). None of the other architectures exports this, so I just dropped it. Signed-off-by: Palmer Dabbelt Signed-off-by: Bjorn Helgaas

tile: use __ro_after_init instead of tile-specific __write_once

2016-12-16T20:32:29+00:00

The semantics of the old tile __write_once are the same as the newer generic __ro_after_init, so rename them all and get rid of the tile-specific version. This does not enable actual support for __ro_after_init, which had been dropped from the tile architecture before the initial upstreaming was done, since we had at that time switched to using 16MB huge pages to map the kernel. Signed-off-by: Chris Metcalf

PCI: Assign resources before drivers claim devices (pci_scan_root_bus())

2015-03-19T15:17:13+00:00

Previously, pci_scan_root_bus() created a root PCI bus, enumerated the devices on it, and called pci_bus_add_devices(), which made the devices available for drivers to claim them. Most callers assigned resources to devices after pci_scan_root_bus() returns, which may be after drivers have claimed the devices. This is incorrect; the PCI core should not change device resources while a driver is managing the device. Remove pci_bus_add_devices() from pci_scan_root_bus() and do it after any resource assignment in the callers. Note that ARM's pci_common_init_dev() already called pci_bus_add_devices() after pci_scan_root_bus(), so we only need to remove the first call: pci_common_init_dev pcibios_init_hw pci_scan_root_bus pci_bus_add_devices # first call pci_bus_assign_resources pci_bus_add_devices # second call [bhelgaas: changelog, drop "root_bus" var in alpha common_init_pci(), return failure earlier in mn10300, add "return" in x86 pcibios_scan_root(), return early if xtensa platform_pcibios_fixup() fails] Signed-off-by: Yijing Wang Signed-off-by: Bjorn Helgaas CC: Richard Henderson CC: Ivan Kokshaysky CC: Matt Turner CC: David Howells CC: Tony Luck CC: Michal Simek CC: Ralf Baechle CC: Koichi Yasutake CC: Sebastian Ott CC: "David S. Miller" CC: Chris Metcalf CC: Chris Zankel CC: Max Filippov CC: Thomas Gleixner

tile: use PCI define for Max_Read_Request_Size

2015-01-27T14:14:26+00:00

Replace a magic number with a PCI #define symbol. Signed-off-by: Rafał Miłecki Signed-off-by: Bjorn Helgaas Acked-by: Chris Metcalf

tile: Use the more common pr_warn instead of pr_warning

2014-11-11T20:51:42+00:00

And other message logging neatening. Other miscellanea: o coalesce formats o realign arguments o standardize a couple of macros o use __func__ instead of embedding the function name Signed-off-by: Joe Perches Signed-off-by: Chris Metcalf

arch/tile: remove unused variable 'devcap'

2014-04-04T17:11:40+00:00

Commit 503275bf37 removed the use of the variable but not the variable itself. Signed-off-by: Chris Metcalf