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irq_remapping.h
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1 /*
2  * Copyright (C) 2012 Advanced Micro Devices, Inc.
3  * Author: Joerg Roedel <[email protected]>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 as published
7  * by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * This header file contains stuff that is shared between different interrupt
19  * remapping drivers but with no need to be visible outside of the IOMMU layer.
20  */
21 
22 #ifndef __IRQ_REMAPPING_H
23 #define __IRQ_REMAPPING_H
24 
25 #ifdef CONFIG_IRQ_REMAP
26 
27 struct IO_APIC_route_entry;
28 struct io_apic_irq_attr;
29 struct irq_data;
30 struct cpumask;
31 struct pci_dev;
32 struct msi_msg;
33 
34 extern int disable_irq_remap;
35 extern int disable_sourceid_checking;
36 extern int no_x2apic_optout;
37 
38 struct irq_remap_ops {
39  /* Check whether Interrupt Remapping is supported */
40  int (*supported)(void);
41 
42  /* Initializes hardware and makes it ready for remapping interrupts */
43  int (*prepare)(void);
44 
45  /* Enables the remapping hardware */
46  int (*enable)(void);
47 
48  /* Disables the remapping hardware */
49  void (*disable)(void);
50 
51  /* Reenables the remapping hardware */
52  int (*reenable)(int);
53 
54  /* Enable fault handling */
55  int (*enable_faulting)(void);
56 
57  /* IO-APIC setup routine */
58  int (*setup_ioapic_entry)(int irq, struct IO_APIC_route_entry *,
59  unsigned int, int,
60  struct io_apic_irq_attr *);
61 
62  /* Set the CPU affinity of a remapped interrupt */
63  int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
64  bool force);
65 
66  /* Free an IRQ */
67  int (*free_irq)(int);
68 
69  /* Create MSI msg to use for interrupt remapping */
70  void (*compose_msi_msg)(struct pci_dev *,
71  unsigned int, unsigned int,
72  struct msi_msg *, u8);
73 
74  /* Allocate remapping resources for MSI */
75  int (*msi_alloc_irq)(struct pci_dev *, int, int);
76 
77  /* Setup the remapped MSI irq */
78  int (*msi_setup_irq)(struct pci_dev *, unsigned int, int, int);
79 
80  /* Setup interrupt remapping for an HPET MSI */
81  int (*setup_hpet_msi)(unsigned int, unsigned int);
82 };
83 
84 extern struct irq_remap_ops intel_irq_remap_ops;
85 extern struct irq_remap_ops amd_iommu_irq_ops;
86 
87 #else /* CONFIG_IRQ_REMAP */
88 
89 #define irq_remapping_enabled 0
90 #define disable_irq_remap 1
91 
92 #endif /* CONFIG_IRQ_REMAP */
93 
94 #endif /* __IRQ_REMAPPING_H */
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