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PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it

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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>
This commit is contained in:
Matthew Minter 2017-06-28 15:14:02 -05:00 committed by Bjorn Helgaas
parent 3aa8a41e0b
commit 47a650f279
2 changed files with 36 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/pci/setup-irq.c
View File

@ -15,6 +15,7 @@
#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)
{
@ -22,12 +23,17 @@ void __weak pcibios_update_irq(struct pci_dev *dev, int irq)
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}
static void pdev_fixup_irq(struct pci_dev *dev,
u8 (*swizzle)(struct pci_dev *, u8 *),
int (*map_irq)(const struct pci_dev *, u8, u8))
void pci_assign_irq(struct pci_dev *dev)
{
u8 pin, slot;
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
@ -40,17 +46,22 @@ static void pdev_fixup_irq(struct pci_dev *dev,
if (pin > 4)
pin = 1;
if (pin != 0) {
if (pin) {
/* Follow the chain of bridges, swizzling as we go. */
slot = (*swizzle)(dev, &pin);
if (hbrg->swizzle_irq)
slot = (*(hbrg->swizzle_irq))(dev, &pin);
irq = (*map_irq)(dev, slot, 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, "fixup irq: got %d\n", dev->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. */
@ -60,9 +71,23 @@ static void pdev_fixup_irq(struct pci_dev *dev,
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)
pdev_fixup_irq(dev, swizzle, map_irq);
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);

1
include/linux/pci.h
View File

@ -1147,6 +1147,7 @@ void pdev_enable_device(struct pci_dev *);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
int (*)(const struct pci_dev *, u8, u8));
void pci_assign_irq(struct pci_dev *dev);
struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res);
#define HAVE_PCI_REQ_REGIONS 2
int __must_check pci_request_regions(struct pci_dev *, const char *);