mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 20:36:45 +07:00
47a650f279
Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
|
|
* drivers/pci/setup-irq.c
|
|
*
|
|
* Extruded from code written by
|
|
* Dave Rusling (david.rusling@reo.mts.dec.com)
|
|
* David Mosberger (davidm@cs.arizona.edu)
|
|
* David Miller (davem@redhat.com)
|
|
*
|
|
* Support routines for initializing a PCI subsystem.
|
|
*/
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/cache.h>
|
|
#include "pci.h"
|
|
|
|
void __weak pcibios_update_irq(struct pci_dev *dev, int irq)
|
|
{
|
|
dev_dbg(&dev->dev, "assigning IRQ %02d\n", irq);
|
|
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
|
|
}
|
|
|
|
void pci_assign_irq(struct pci_dev *dev)
|
|
{
|
|
u8 pin;
|
|
u8 slot = -1;
|
|
int irq = 0;
|
|
struct pci_host_bridge *hbrg = pci_find_host_bridge(dev->bus);
|
|
|
|
if (!(hbrg->map_irq)) {
|
|
dev_dbg(&dev->dev, "runtime IRQ mapping not provided by arch\n");
|
|
return;
|
|
}
|
|
|
|
/* If this device is not on the primary bus, we need to figure out
|
|
which interrupt pin it will come in on. We know which slot it
|
|
will come in on 'cos that slot is where the bridge is. Each
|
|
time the interrupt line passes through a PCI-PCI bridge we must
|
|
apply the swizzle function. */
|
|
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
|
|
/* Cope with illegal. */
|
|
if (pin > 4)
|
|
pin = 1;
|
|
|
|
if (pin) {
|
|
/* Follow the chain of bridges, swizzling as we go. */
|
|
if (hbrg->swizzle_irq)
|
|
slot = (*(hbrg->swizzle_irq))(dev, &pin);
|
|
|
|
/*
|
|
* If a swizzling function is not used map_irq must
|
|
* ignore slot
|
|
*/
|
|
irq = (*(hbrg->map_irq))(dev, slot, pin);
|
|
if (irq == -1)
|
|
irq = 0;
|
|
}
|
|
dev->irq = irq;
|
|
|
|
dev_dbg(&dev->dev, "assign IRQ: got %d\n", dev->irq);
|
|
|
|
/* Always tell the device, so the driver knows what is
|
|
the real IRQ to use; the device does not use it. */
|
|
pcibios_update_irq(dev, irq);
|
|
}
|
|
|
|
void pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
|
|
int (*map_irq)(const struct pci_dev *, u8, u8))
|
|
{
|
|
/*
|
|
* Implement pci_fixup_irqs() through pci_assign_irq().
|
|
* This code should be remove eventually, it is a wrapper
|
|
* around pci_assign_irq() interface to keep current
|
|
* pci_fixup_irqs() behaviour unchanged on architecture
|
|
* code still relying on its interface.
|
|
*/
|
|
struct pci_dev *dev = NULL;
|
|
struct pci_host_bridge *hbrg = NULL;
|
|
|
|
for_each_pci_dev(dev) {
|
|
hbrg = pci_find_host_bridge(dev->bus);
|
|
hbrg->swizzle_irq = swizzle;
|
|
hbrg->map_irq = map_irq;
|
|
pci_assign_irq(dev);
|
|
hbrg->swizzle_irq = NULL;
|
|
hbrg->map_irq = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_fixup_irqs);
|