1 // SPDX-License-Identifier: GPL-2.0
19  * pci_request_irq - allocate an interrupt line for a PCI device
21  * @nr:		device-relative interrupt vector index (0-based).
29  * @fmt:	Printf-like format string naming the handler
37 int pci_request_irq(struct pci_dev *dev, unsigned int nr, irq_handler_t handler,  in pci_request_irq()  argument
52 		return -ENOMEM;  in pci_request_irq()
54 	ret = request_threaded_irq(pci_irq_vector(dev, nr), handler, thread_fn,  in pci_request_irq()
63  * pci_free_irq - free an interrupt allocated with pci_request_irq
65  * @nr:		device-relative interrupt vector index (0-based).
76 void pci_free_irq(struct pci_dev *dev, unsigned int nr, void *dev_id)  in pci_free_irq()  argument
78 	kfree(free_irq(pci_irq_vector(dev, nr), dev_id));  in pci_free_irq()
83  * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
85  * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
88  * required by section 9.1 of the PCI-to-PCI bridge specification for devices
89  * behind bridges on add-in cards.  For devices with ARI enabled, the slot
97 	if (pci_ari_enabled(dev->bus))  in pci_swizzle_interrupt_pin()
100 		slot = PCI_SLOT(dev->devfn);  in pci_swizzle_interrupt_pin()
102 	return (((pin - 1) + slot) % 4) + 1;  in pci_swizzle_interrupt_pin()
109 	pin = dev->pin;  in pci_get_interrupt_pin()
111 		return -1;  in pci_get_interrupt_pin()
113 	while (!pci_is_root_bus(dev->bus)) {  in pci_get_interrupt_pin()
115 		dev = dev->bus->self;  in pci_get_interrupt_pin()
122  * pci_common_swizzle - swizzle INTx all the way to root bridge
126  * Perform INTx swizzling for a device.  This traverses through all PCI-to-PCI
133 	while (!pci_is_root_bus(dev->bus)) {  in pci_common_swizzle()
135 		dev = dev->bus->self;  in pci_common_swizzle()
138 	return PCI_SLOT(dev->devfn);  in pci_common_swizzle()
145 	u8 slot = -1;  in pci_assign_irq()
147 	struct pci_host_bridge *hbrg = pci_find_host_bridge(dev->bus);  in pci_assign_irq()
149 	if (!(hbrg->map_irq)) {  in pci_assign_irq()
158 	 * time the interrupt line passes through a PCI-PCI bridge we must  in pci_assign_irq()
168 		if (hbrg->swizzle_irq)  in pci_assign_irq()
169 			slot = (*(hbrg->swizzle_irq))(dev, &pin);  in pci_assign_irq()
175 		irq = (*(hbrg->map_irq))(dev, slot, pin);  in pci_assign_irq()
176 		if (irq == -1)  in pci_assign_irq()
179 	dev->irq = irq;  in pci_assign_irq()
181 	pci_dbg(dev, "assign IRQ: got %d\n", dev->irq);  in pci_assign_irq()
192 	struct pci_bus *bus = dev->bus;  in pci_check_and_set_intx_mask()
208 	bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword);  in pci_check_and_set_intx_mask()
227 		bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd);  in pci_check_and_set_intx_mask()
236  * pci_check_and_mask_intx - mask INTx on pending interrupt
249  * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
263  * pcibios_penalize_isa_irq - penalize an ISA IRQ
267  * Permits the platform to provide architecture-specific functionality when
268  * penalizing ISA IRQs. This is the default implementation. Architecture