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25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/module.h>
28#include <linux/pci.h>
29
30#include <xen/platform_pci.h>
31#include <xen/grant_table.h>
32#include <xen/xenbus.h>
33#include <xen/events.h>
34#include <xen/hvm.h>
35#include <xen/xen-ops.h>
36
37#define DRV_NAME "xen-platform-pci"
38
39MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
40MODULE_DESCRIPTION("Xen platform PCI device");
41MODULE_LICENSE("GPL");
42
43static unsigned long platform_mmio;
44static unsigned long platform_mmio_alloc;
45static unsigned long platform_mmiolen;
46static uint64_t callback_via;
47
48static unsigned long alloc_xen_mmio(unsigned long len)
49{
50 unsigned long addr;
51
52 addr = platform_mmio + platform_mmio_alloc;
53 platform_mmio_alloc += len;
54 BUG_ON(platform_mmio_alloc > platform_mmiolen);
55
56 return addr;
57}
58
59static uint64_t get_callback_via(struct pci_dev *pdev)
60{
61 u8 pin;
62 int irq;
63
64 irq = pdev->irq;
65 if (irq < 16)
66 return irq;
67
68 pin = pdev->pin;
69
70
71 return ((uint64_t)0x01 << 56) |
72 ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
73 ((uint64_t)pdev->bus->number << 16) |
74 ((uint64_t)(pdev->devfn & 0xff) << 8) |
75 ((uint64_t)(pin - 1) & 3);
76}
77
78static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
79{
80 xen_hvm_evtchn_do_upcall();
81 return IRQ_HANDLED;
82}
83
84static int xen_allocate_irq(struct pci_dev *pdev)
85{
86 return request_irq(pdev->irq, do_hvm_evtchn_intr,
87 IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
88 "xen-platform-pci", pdev);
89}
90
91static int platform_pci_resume(struct pci_dev *pdev)
92{
93 int err;
94 if (xen_have_vector_callback)
95 return 0;
96 err = xen_set_callback_via(callback_via);
97 if (err) {
98 dev_err(&pdev->dev, "platform_pci_resume failure!\n");
99 return err;
100 }
101 return 0;
102}
103
104static int platform_pci_init(struct pci_dev *pdev,
105 const struct pci_device_id *ent)
106{
107 int i, ret;
108 long ioaddr;
109 long mmio_addr, mmio_len;
110 unsigned int max_nr_gframes;
111 unsigned long grant_frames;
112
113 if (!xen_domain())
114 return -ENODEV;
115
116 i = pci_enable_device(pdev);
117 if (i)
118 return i;
119
120 ioaddr = pci_resource_start(pdev, 0);
121
122 mmio_addr = pci_resource_start(pdev, 1);
123 mmio_len = pci_resource_len(pdev, 1);
124
125 if (mmio_addr == 0 || ioaddr == 0) {
126 dev_err(&pdev->dev, "no resources found\n");
127 ret = -ENOENT;
128 goto pci_out;
129 }
130
131 ret = pci_request_region(pdev, 1, DRV_NAME);
132 if (ret < 0)
133 goto pci_out;
134
135 ret = pci_request_region(pdev, 0, DRV_NAME);
136 if (ret < 0)
137 goto mem_out;
138
139 platform_mmio = mmio_addr;
140 platform_mmiolen = mmio_len;
141
142 if (!xen_have_vector_callback) {
143 ret = xen_allocate_irq(pdev);
144 if (ret) {
145 dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
146 goto out;
147 }
148 callback_via = get_callback_via(pdev);
149 ret = xen_set_callback_via(callback_via);
150 if (ret) {
151 dev_warn(&pdev->dev, "Unable to set the evtchn callback "
152 "err=%d\n", ret);
153 goto out;
154 }
155 }
156
157 max_nr_gframes = gnttab_max_grant_frames();
158 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
159 ret = gnttab_setup_auto_xlat_frames(grant_frames);
160 if (ret)
161 goto out;
162 ret = gnttab_init();
163 if (ret)
164 goto grant_out;
165 xenbus_probe(NULL);
166 return 0;
167grant_out:
168 gnttab_free_auto_xlat_frames();
169out:
170 pci_release_region(pdev, 0);
171mem_out:
172 pci_release_region(pdev, 1);
173pci_out:
174 pci_disable_device(pdev);
175 return ret;
176}
177
178static struct pci_device_id platform_pci_tbl[] = {
179 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
180 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
181 {0,}
182};
183
184MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
185
186static struct pci_driver platform_driver = {
187 .name = DRV_NAME,
188 .probe = platform_pci_init,
189 .id_table = platform_pci_tbl,
190#ifdef CONFIG_PM
191 .resume_early = platform_pci_resume,
192#endif
193};
194
195static int __init platform_pci_module_init(void)
196{
197 return pci_register_driver(&platform_driver);
198}
199
200module_init(platform_pci_module_init);
201
