Commit | Line | Data |
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b5401a96 AN |
1 | /* |
2 | * Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux | |
3 | * x86 PCI core to support the Xen PCI Frontend | |
4 | * | |
5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
6 | */ | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/pci.h> | |
10 | #include <linux/acpi.h> | |
11 | ||
12 | #include <linux/io.h> | |
13 | #include <asm/pci_x86.h> | |
14 | ||
15 | #include <asm/xen/hypervisor.h> | |
16 | ||
17 | #include <xen/events.h> | |
18 | #include <asm/xen/pci.h> | |
19 | ||
42a1de56 SS |
20 | #ifdef CONFIG_ACPI |
21 | static int xen_hvm_register_pirq(u32 gsi, int triggering) | |
22 | { | |
23 | int rc, irq; | |
24 | struct physdev_map_pirq map_irq; | |
25 | int shareable = 0; | |
26 | char *name; | |
27 | ||
28 | if (!xen_hvm_domain()) | |
29 | return -1; | |
30 | ||
31 | map_irq.domid = DOMID_SELF; | |
32 | map_irq.type = MAP_PIRQ_TYPE_GSI; | |
33 | map_irq.index = gsi; | |
34 | map_irq.pirq = -1; | |
35 | ||
36 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); | |
37 | if (rc) { | |
38 | printk(KERN_WARNING "xen map irq failed %d\n", rc); | |
39 | return -1; | |
40 | } | |
41 | ||
42 | if (triggering == ACPI_EDGE_SENSITIVE) { | |
43 | shareable = 0; | |
44 | name = "ioapic-edge"; | |
45 | } else { | |
46 | shareable = 1; | |
47 | name = "ioapic-level"; | |
48 | } | |
49 | ||
50 | irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name); | |
51 | ||
52 | printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq); | |
53 | ||
54 | return irq; | |
55 | } | |
90f6881e JF |
56 | |
57 | static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi, | |
58 | int trigger, int polarity) | |
59 | { | |
60 | return xen_hvm_register_pirq(gsi, trigger); | |
61 | } | |
42a1de56 SS |
62 | #endif |
63 | ||
b5401a96 AN |
64 | #if defined(CONFIG_PCI_MSI) |
65 | #include <linux/msi.h> | |
66 | ||
67 | struct xen_pci_frontend_ops *xen_pci_frontend; | |
68 | EXPORT_SYMBOL_GPL(xen_pci_frontend); | |
69 | ||
70 | /* | |
71 | * For MSI interrupts we have to use drivers/xen/event.s functions to | |
72 | * allocate an irq_desc and setup the right */ | |
73 | ||
74 | ||
75 | static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) | |
76 | { | |
77 | int irq, ret, i; | |
78 | struct msi_desc *msidesc; | |
79 | int *v; | |
80 | ||
81 | v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL); | |
82 | if (!v) | |
83 | return -ENOMEM; | |
84 | ||
85 | if (!xen_initial_domain()) { | |
86 | if (type == PCI_CAP_ID_MSIX) | |
87 | ret = xen_pci_frontend_enable_msix(dev, &v, nvec); | |
88 | else | |
89 | ret = xen_pci_frontend_enable_msi(dev, &v); | |
90 | if (ret) | |
91 | goto error; | |
92 | } | |
93 | i = 0; | |
94 | list_for_each_entry(msidesc, &dev->msi_list, list) { | |
95 | irq = xen_allocate_pirq(v[i], 0, /* not sharable */ | |
96 | (type == PCI_CAP_ID_MSIX) ? | |
97 | "pcifront-msi-x" : "pcifront-msi"); | |
98 | if (irq < 0) | |
99 | return -1; | |
100 | ||
101 | ret = set_irq_msi(irq, msidesc); | |
102 | if (ret) | |
103 | goto error_while; | |
104 | i++; | |
105 | } | |
106 | kfree(v); | |
107 | return 0; | |
108 | ||
109 | error_while: | |
110 | unbind_from_irqhandler(irq, NULL); | |
111 | error: | |
112 | if (ret == -ENODEV) | |
113 | dev_err(&dev->dev, "Xen PCI frontend has not registered" \ | |
114 | " MSI/MSI-X support!\n"); | |
115 | ||
116 | kfree(v); | |
117 | return ret; | |
118 | } | |
119 | ||
120 | static void xen_teardown_msi_irqs(struct pci_dev *dev) | |
121 | { | |
122 | /* Only do this when were are in non-privileged mode.*/ | |
123 | if (!xen_initial_domain()) { | |
124 | struct msi_desc *msidesc; | |
125 | ||
126 | msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); | |
127 | if (msidesc->msi_attrib.is_msix) | |
128 | xen_pci_frontend_disable_msix(dev); | |
129 | else | |
130 | xen_pci_frontend_disable_msi(dev); | |
131 | } | |
132 | ||
133 | } | |
134 | ||
135 | static void xen_teardown_msi_irq(unsigned int irq) | |
136 | { | |
137 | xen_destroy_irq(irq); | |
138 | } | |
139 | #endif | |
140 | ||
141 | static int xen_pcifront_enable_irq(struct pci_dev *dev) | |
142 | { | |
143 | int rc; | |
144 | int share = 1; | |
145 | ||
146 | dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq); | |
147 | ||
148 | if (dev->irq < 0) | |
149 | return -EINVAL; | |
150 | ||
151 | if (dev->irq < NR_IRQS_LEGACY) | |
152 | share = 0; | |
153 | ||
154 | rc = xen_allocate_pirq(dev->irq, share, "pcifront"); | |
155 | if (rc < 0) { | |
156 | dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n", | |
157 | dev->irq, rc); | |
158 | return rc; | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
163 | int __init pci_xen_init(void) | |
164 | { | |
165 | if (!xen_pv_domain() || xen_initial_domain()) | |
166 | return -ENODEV; | |
167 | ||
168 | printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n"); | |
169 | ||
170 | pcibios_set_cache_line_size(); | |
171 | ||
172 | pcibios_enable_irq = xen_pcifront_enable_irq; | |
173 | pcibios_disable_irq = NULL; | |
174 | ||
175 | #ifdef CONFIG_ACPI | |
176 | /* Keep ACPI out of the picture */ | |
177 | acpi_noirq = 1; | |
178 | #endif | |
179 | ||
b5401a96 AN |
180 | #ifdef CONFIG_PCI_MSI |
181 | x86_msi.setup_msi_irqs = xen_setup_msi_irqs; | |
182 | x86_msi.teardown_msi_irq = xen_teardown_msi_irq; | |
183 | x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs; | |
184 | #endif | |
185 | return 0; | |
186 | } |