Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef LINUX_MSI_H
2#define LINUX_MSI_H
3
4#include <linux/list.h>
5
6struct msi_msg {
7 u32 address_lo; /* low 32 bits of msi message address */
8 u32 address_hi; /* high 32 bits of msi message address */
9 u32 data; /* 16 bits of msi message data */
10};
11
12/* Helper functions */
13struct irq_desc;
14extern void mask_msi_irq(unsigned int irq);
15extern void unmask_msi_irq(unsigned int irq);
16extern void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
17extern void get_cached_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
18extern void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
19extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
20extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
21extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
22
23struct msi_desc {
24 struct {
25 __u8 is_msix : 1;
26 __u8 multiple: 3; /* log2 number of messages */
27 __u8 maskbit : 1; /* mask-pending bit supported ? */
28 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
29 __u8 pos; /* Location of the msi capability */
30 __u16 entry_nr; /* specific enabled entry */
31 unsigned default_irq; /* default pre-assigned irq */
32 } msi_attrib;
33
34 u32 masked; /* mask bits */
35 unsigned int irq;
36 struct list_head list;
37
38 union {
39 void __iomem *mask_base;
40 u8 mask_pos;
41 };
42 struct pci_dev *dev;
43
44 /* Last set MSI message */
45 struct msi_msg msg;
46};
47
48/*
49 * The arch hook for setup up msi irqs
50 */
51int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
52void arch_teardown_msi_irq(unsigned int irq);
53extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
54extern void arch_teardown_msi_irqs(struct pci_dev *dev);
55extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
56
57
58#endif /* LINUX_MSI_H */