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Code Issues Releases Wiki Activity

PCI/MSI: Split out !IRQDOMAIN code

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Split out the non irqdomain code into its own file.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211206210224.763574089@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:27:51 +01:00
parent 54324c2f3d
commit a01e09ef12
3 changed files with 55 additions and 48 deletions
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5
drivers/pci/msi/Makefile
View file

@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the PCI/MSI
obj-$(CONFIG_PCI) += pcidev_msi.o
obj-$(CONFIG_PCI_MSI) += msi.o
obj-$(CONFIG_PCI) += pcidev_msi.o
obj-$(CONFIG_PCI_MSI) += msi.o
obj-$(CONFIG_PCI_MSI_ARCH_FALLBACKS) += legacy.o

52
drivers/pci/msi/legacy.c Normal file
View file

@ -0,0 +1,52 @@
// SPDX-License-Identifier: GPL-2.0
/*
* PCI Message Signaled Interrupt (MSI).
*
* Legacy architecture specific setup and teardown mechanism.
*/
#include <linux/msi.h>
#include <linux/pci.h>
/* Arch hooks */
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
return -EINVAL;
}
void __weak arch_teardown_msi_irq(unsigned int irq)
{
}
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct msi_desc *desc;
int ret;
/*
* If an architecture wants to support multiple MSI, it needs to
* override arch_setup_msi_irqs()
*/
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
for_each_pci_msi_entry(desc, dev) {
ret = arch_setup_msi_irq(dev, desc);
if (ret)
return ret < 0 ? ret : -ENOSPC;
}
return 0;
}
void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
{
struct msi_desc *desc;
int i;
for_each_pci_msi_entry(desc, dev) {
if (desc->irq) {
for (i = 0; i < desc->nvec_used; i++)
arch_teardown_msi_irq(desc->irq + i);
}
}
}

46
drivers/pci/msi/msi.c
View file

@ -50,52 +50,6 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
#endif
#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
/* Arch hooks */
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
return -EINVAL;
}
void __weak arch_teardown_msi_irq(unsigned int irq)
{
}
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct msi_desc *entry;
int ret;
/*
* If an architecture wants to support multiple MSI, it needs to
* override arch_setup_msi_irqs()
*/
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
for_each_pci_msi_entry(entry, dev) {
ret = arch_setup_msi_irq(dev, entry);
if (ret < 0)
return ret;
if (ret > 0)
return -ENOSPC;
}
return 0;
}
void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
{
int i;
struct msi_desc *entry;
for_each_pci_msi_entry(entry, dev)
if (entry->irq)
for (i = 0; i < entry->nvec_used; i++)
arch_teardown_msi_irq(entry->irq + i);
}
#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
/*
* PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
* mask all MSI interrupts by clearing the MSI enable bit does not work