From 04c81c7293df875ca6a46e2c9a272c7ec72e5145 Mon Sep 17 00:00:00 2001 From: Lorenzo Pieralisi Date: Mon, 31 Jul 2017 17:37:53 +0100 Subject: [PATCH] MIPS: PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks 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 initialized map/swizzle pointers) and remove the pci_fixup_irqs() call from arch code. Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Cc: Ralf Baechle Cc: Paul Burton --- arch/mips/pci/pci-legacy.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c index 71d62f818d77..fc7726088103 100644 --- a/arch/mips/pci/pci-legacy.c +++ b/arch/mips/pci/pci-legacy.c @@ -78,6 +78,12 @@ static void pcibios_scanbus(struct pci_controller *hose) static int need_domain_info; LIST_HEAD(resources); struct pci_bus *bus; + struct pci_host_bridge *bridge; + int ret; + + bridge = pci_alloc_host_bridge(0); + if (!bridge) + return; if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY)) next_busno = (*hose->get_busno)(); @@ -87,14 +93,20 @@ static void pcibios_scanbus(struct pci_controller *hose) pci_add_resource_offset(&resources, hose->io_resource, hose->io_offset); pci_add_resource(&resources, hose->busn_resource); - bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose, - &resources); - if (!bus) { - pci_free_resource_list(&resources); + list_splice_init(&resources, &bridge->windows); + bridge->dev.parent = NULL; + bridge->sysdata = hose; + bridge->busnr = next_busno; + bridge->ops = hose->pci_ops; + bridge->swizzle_irq = pci_common_swizzle; + bridge->map_irq = pcibios_map_irq; + ret = pci_scan_root_bus_bridge(bridge); + if (ret) { + pci_free_host_bridge(bridge); return; } - hose->bus = bus; + hose->bus = bus = bridge->bus; need_domain_info = need_domain_info || pci_domain_nr(bus); set_pci_need_domain_info(hose, need_domain_info); @@ -224,8 +236,6 @@ static int __init pcibios_init(void) list_for_each_entry(hose, &controllers, list) pcibios_scanbus(hose); - pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq); - pci_initialized = 1; return 0; -- 2.20.1