Contributors: 11
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Thomas Gleixner |
159 |
52.48% |
5 |
21.74% |
| Adrian Bunk |
37 |
12.21% |
1 |
4.35% |
| Michael Ellerman |
31 |
10.23% |
4 |
17.39% |
| Matthew Wilcox |
20 |
6.60% |
1 |
4.35% |
| Eric W. Biedermann |
19 |
6.27% |
5 |
21.74% |
| Thomas Petazzoni |
15 |
4.95% |
1 |
4.35% |
| Jiang Liu |
10 |
3.30% |
2 |
8.70% |
| Roland Dreier |
8 |
2.64% |
1 |
4.35% |
| Marc Zyngier |
2 |
0.66% |
1 |
4.35% |
| Björn Helgaas |
1 |
0.33% |
1 |
4.35% |
| Andrew Morton |
1 |
0.33% |
1 |
4.35% |
| Total |
303 |
|
23 |
|
// 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);
}