From bccf90d6e063d278b9ddc78dd266d0adef29886c Mon Sep 17 00:00:00 2001 From: Palmer Dabbelt Date: Fri, 23 Jun 2017 18:50:42 -0700 Subject: PCI: Add a generic weak pcibios_fixup_bus() 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 --- arch/tile/kernel/pci.c | 8 -------- arch/tile/kernel/pci_gx.c | 5 ----- 2 files changed, 13 deletions(-) (limited to 'arch/tile') diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c index bc6656b5708b..3113d4d5c329 100644 --- a/arch/tile/kernel/pci.c +++ b/arch/tile/kernel/pci.c @@ -369,14 +369,6 @@ int __init pcibios_init(void) } subsys_initcall(pcibios_init); -/* - * No bus fixups needed. - */ -void pcibios_fixup_bus(struct pci_bus *bus) -{ - /* Nothing needs to be done. */ -} - void pcibios_set_master(struct pci_dev *dev) { /* No special bus mastering setup handling. */ diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c index b554a68eea1b..b89172b592cc 100644 --- a/arch/tile/kernel/pci_gx.c +++ b/arch/tile/kernel/pci_gx.c @@ -1038,11 +1038,6 @@ alloc_mem_map_failed: } subsys_initcall(pcibios_init); -/* No bus fixups needed. */ -void pcibios_fixup_bus(struct pci_bus *bus) -{ -} - /* Process any "pci=" kernel boot arguments. */ char *__init pcibios_setup(char *str) { -- cgit From ecf677c8dcaa7bf13eee31b4d9e4639d559984ad Mon Sep 17 00:00:00 2001 From: Palmer Dabbelt Date: Wed, 2 Aug 2017 14:44:50 -0500 Subject: PCI: Add a generic weak pcibios_align_resource() 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 --- arch/tile/kernel/pci.c | 10 ---------- arch/tile/kernel/pci_gx.c | 9 --------- 2 files changed, 19 deletions(-) (limited to 'arch/tile') diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c index 3113d4d5c329..8999a20ed9d1 100644 --- a/arch/tile/kernel/pci.c +++ b/arch/tile/kernel/pci.c @@ -66,16 +66,6 @@ static int pci_scan_flags[TILE_NUM_PCIE]; static struct pci_ops tile_cfg_ops; -/* - * We don't need to worry about the alignment of resources. - */ -resource_size_t pcibios_align_resource(void *data, const struct resource *res, - resource_size_t size, resource_size_t align) -{ - return res->start; -} -EXPORT_SYMBOL(pcibios_align_resource); - /* * Open a FD to the hypervisor PCI device. * diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c index b89172b592cc..0a7642184a9a 100644 --- a/arch/tile/kernel/pci_gx.c +++ b/arch/tile/kernel/pci_gx.c @@ -108,15 +108,6 @@ static struct pci_ops tile_cfg_ops; /* Mask of CPUs that should receive PCIe interrupts. */ static struct cpumask intr_cpus_map; -/* We don't need to worry about the alignment of resources. */ -resource_size_t pcibios_align_resource(void *data, const struct resource *res, - resource_size_t size, - resource_size_t align) -{ - return res->start; -} -EXPORT_SYMBOL(pcibios_align_resource); - /* * Pick a CPU to receive and handle the PCIe interrupts, based on the IRQ #. * For now, we simply send interrupts to non-dataplane CPUs. -- cgit From 98611dd735b472c23cc1e8cca90a997393a3a955 Mon Sep 17 00:00:00 2001 From: Lorenzo Pieralisi Date: Mon, 31 Jul 2017 17:37:54 +0100 Subject: tile/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 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 --- arch/tile/kernel/pci.c | 21 ++++++++++++++++----- arch/tile/kernel/pci_gx.c | 21 ++++++++++++++++----- 2 files changed, 32 insertions(+), 10 deletions(-) (limited to 'arch/tile') diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c index bc6656b5708b..884826157765 100644 --- a/arch/tile/kernel/pci.c +++ b/arch/tile/kernel/pci.c @@ -274,6 +274,7 @@ static void fixup_read_and_payload_sizes(void) */ int __init pcibios_init(void) { + struct pci_host_bridge *bridge; int i; pr_info("PCI: Probing PCI hardware\n"); @@ -306,16 +307,26 @@ int __init pcibios_init(void) pci_add_resource(&resources, &ioport_resource); pci_add_resource(&resources, &iomem_resource); - bus = pci_scan_root_bus(NULL, 0, controller->ops, - controller, &resources); + + bridge = pci_alloc_host_bridge(0); + if (!bridge) + break; + + list_splice_init(&resources, &bridge->windows); + bridge->dev.parent = NULL; + bridge->sysdata = controller; + bridge->busnr = 0; + bridge->ops = controller->ops; + bridge->swizzle_irq = pci_common_swizzle; + bridge->map_irq = tile_map_irq; + + pci_scan_root_bus_bridge(bridge); + bus = bridge->bus; controller->root_bus = bus; controller->last_busno = bus->busn_res.end; } } - /* Do machine dependent PCI interrupt routing */ - pci_fixup_irqs(pci_common_swizzle, tile_map_irq); - /* * This comes from the generic Linux PCI driver. * diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c index b554a68eea1b..e68317083ac7 100644 --- a/arch/tile/kernel/pci_gx.c +++ b/arch/tile/kernel/pci_gx.c @@ -669,6 +669,7 @@ int __init pcibios_init(void) resource_size_t offset; LIST_HEAD(resources); int next_busno; + struct pci_host_bridge *bridge; int i; tile_pci_init(); @@ -881,15 +882,25 @@ int __init pcibios_init(void) controller->mem_offset); pci_add_resource(&resources, &controller->io_space); controller->first_busno = next_busno; - bus = pci_scan_root_bus(NULL, next_busno, controller->ops, - controller, &resources); + + bridge = pci_alloc_host_bridge(0); + if (!bridge) + break; + + list_splice_init(&resources, &bridge->windows); + bridge->dev.parent = NULL; + bridge->sysdata = controller; + bridge->busnr = next_busno; + bridge->ops = controller->ops; + bridge->swizzle_irq = pci_common_swizzle; + bridge->map_irq = tile_map_irq; + + pci_scan_root_bus_bridge(bridge); + bus = bridge->bus; controller->root_bus = bus; next_busno = bus->busn_res.end + 1; } - /* Do machine dependent PCI interrupt routing */ - pci_fixup_irqs(pci_common_swizzle, tile_map_irq); - /* * This comes from the generic Linux PCI driver. * -- cgit