bridge: fix a possible use after free
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / xen / platform-pci.c
blob319dd0a94d5135389ff7f932ef68872f0936f5e0
1 /******************************************************************************
2 * platform-pci.c
4 * Xen platform PCI device driver
5 * Copyright (c) 2005, Intel Corporation.
6 * Copyright (c) 2007, XenSource Inc.
7 * Copyright (c) 2010, Citrix
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License,
11 * version 2, as published by the Free Software Foundation.
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
20 * Place - Suite 330, Boston, MA 02111-1307 USA.
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
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>
37 #define DRV_NAME "xen-platform-pci"
39 MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
40 MODULE_DESCRIPTION("Xen platform PCI device");
41 MODULE_LICENSE("GPL");
43 static unsigned long platform_mmio;
44 static unsigned long platform_mmio_alloc;
45 static unsigned long platform_mmiolen;
46 static uint64_t callback_via;
48 unsigned long alloc_xen_mmio(unsigned long len)
50 unsigned long addr;
52 addr = platform_mmio + platform_mmio_alloc;
53 platform_mmio_alloc += len;
54 BUG_ON(platform_mmio_alloc > platform_mmiolen);
56 return addr;
59 static uint64_t get_callback_via(struct pci_dev *pdev)
61 u8 pin;
62 int irq;
64 irq = pdev->irq;
65 if (irq < 16)
66 return irq; /* ISA IRQ */
68 pin = pdev->pin;
70 /* We don't know the GSI. Specify the PCI INTx line instead. */
71 return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
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);
78 static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
80 xen_hvm_evtchn_do_upcall();
81 return IRQ_HANDLED;
84 static int xen_allocate_irq(struct pci_dev *pdev)
86 return request_irq(pdev->irq, do_hvm_evtchn_intr,
87 IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
88 "xen-platform-pci", pdev);
91 static int platform_pci_resume(struct pci_dev *pdev)
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;
101 return 0;
104 static int __devinit platform_pci_init(struct pci_dev *pdev,
105 const struct pci_device_id *ent)
107 int i, ret;
108 long ioaddr;
109 long mmio_addr, mmio_len;
110 unsigned int max_nr_gframes;
112 i = pci_enable_device(pdev);
113 if (i)
114 return i;
116 ioaddr = pci_resource_start(pdev, 0);
118 mmio_addr = pci_resource_start(pdev, 1);
119 mmio_len = pci_resource_len(pdev, 1);
121 if (mmio_addr == 0 || ioaddr == 0) {
122 dev_err(&pdev->dev, "no resources found\n");
123 ret = -ENOENT;
124 goto pci_out;
127 ret = pci_request_region(pdev, 1, DRV_NAME);
128 if (ret < 0)
129 goto pci_out;
131 ret = pci_request_region(pdev, 0, DRV_NAME);
132 if (ret < 0)
133 goto mem_out;
135 platform_mmio = mmio_addr;
136 platform_mmiolen = mmio_len;
138 if (!xen_have_vector_callback) {
139 ret = xen_allocate_irq(pdev);
140 if (ret) {
141 dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
142 goto out;
144 callback_via = get_callback_via(pdev);
145 ret = xen_set_callback_via(callback_via);
146 if (ret) {
147 dev_warn(&pdev->dev, "Unable to set the evtchn callback "
148 "err=%d\n", ret);
149 goto out;
153 max_nr_gframes = gnttab_max_grant_frames();
154 xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
155 ret = gnttab_init();
156 if (ret)
157 goto out;
158 xenbus_probe(NULL);
159 return 0;
161 out:
162 pci_release_region(pdev, 0);
163 mem_out:
164 pci_release_region(pdev, 1);
165 pci_out:
166 pci_disable_device(pdev);
167 return ret;
170 static struct pci_device_id platform_pci_tbl[] __devinitdata = {
171 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
172 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
173 {0,}
176 MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
178 static struct pci_driver platform_driver = {
179 .name = DRV_NAME,
180 .probe = platform_pci_init,
181 .id_table = platform_pci_tbl,
182 #ifdef CONFIG_PM
183 .resume_early = platform_pci_resume,
184 #endif
187 static int __init platform_pci_module_init(void)
189 /* no unplug has been done, IGNORE hasn't been specified: just
190 * return now */
191 if (!xen_platform_pci_unplug)
192 return -ENODEV;
194 return pci_register_driver(&platform_driver);
197 module_init(platform_pci_module_init);