linux/drivers/pci/msi/legacy.c
Thomas Gleixner ae24e28fef PCI/MSI: Use msi_on_each_desc()
Use the new iterator functions which pave the way for dynamically extending
MSI-X vectors.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211206210748.142603657@linutronix.de
2021-12-16 22:22:18 +01:00

82 lines
1.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* PCI Message Signaled Interrupt (MSI).
*
* Legacy architecture specific setup and teardown mechanism.
*/
#include "msi.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;
msi_for_each_desc(desc, &dev->dev, MSI_DESC_NOTASSOCIATED) {
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;
msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED) {
for (i = 0; i < desc->nvec_used; i++)
arch_teardown_msi_irq(desc->irq + i);
}
}
static int pci_msi_setup_check_result(struct pci_dev *dev, int type, int ret)
{
struct msi_desc *desc;
int avail = 0;
if (type != PCI_CAP_ID_MSIX || ret >= 0)
return ret;
/* Scan the MSI descriptors for successfully allocated ones. */
msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED)
avail++;
return avail ? avail : ret;
}
int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int ret = arch_setup_msi_irqs(dev, nvec, type);
ret = pci_msi_setup_check_result(dev, type, ret);
if (!ret)
ret = msi_device_populate_sysfs(&dev->dev);
return ret;
}
void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
{
msi_device_destroy_sysfs(&dev->dev);
arch_teardown_msi_irqs(dev);
msi_free_msi_descs(&dev->dev);
}