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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/pci/setup-irq.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/pci/setup-irq.c')
-rw-r--r-- | kernel/drivers/pci/setup-irq.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/kernel/drivers/pci/setup-irq.c b/kernel/drivers/pci/setup-irq.c new file mode 100644 index 000000000..95c225be4 --- /dev/null +++ b/kernel/drivers/pci/setup-irq.c @@ -0,0 +1,68 @@ +/* + * 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> + +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); +} + +static void pdev_fixup_irq(struct pci_dev *dev, + u8 (*swizzle)(struct pci_dev *, u8 *), + int (*map_irq)(const struct pci_dev *, u8, u8)) +{ + u8 pin, slot; + int irq = 0; + + /* 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 != 0) { + /* Follow the chain of bridges, swizzling as we go. */ + slot = (*swizzle)(dev, &pin); + + irq = (*map_irq)(dev, slot, pin); + if (irq == -1) + irq = 0; + } + dev->irq = irq; + + dev_dbg(&dev->dev, "fixup 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)) +{ + struct pci_dev *dev = NULL; + + for_each_pci_dev(dev) + pdev_fixup_irq(dev, swizzle, map_irq); +} +EXPORT_SYMBOL_GPL(pci_fixup_irqs); |