1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// 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);
}
|
