aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/xen/platform-pci.c
blob: 3454973dc3bbd6c4d2c32e037e6e51388cca6395 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/******************************************************************************
 * platform-pci.c
 *
 * Xen platform PCI device driver
 * Copyright (c) 2005, Intel Corporation.
 * Copyright (c) 2007, XenSource Inc.
 * Copyright (c) 2010, Citrix
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 */


#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>

#include <xen/platform_pci.h>
#include <xen/grant_table.h>
#include <xen/xenbus.h>
#include <xen/events.h>
#include <xen/hvm.h>
#include <xen/xen-ops.h>

#define DRV_NAME    "xen-platform-pci"

MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
MODULE_DESCRIPTION("Xen platform PCI device");
MODULE_LICENSE("GPL");

static unsigned long platform_mmio;
static unsigned long platform_mmio_alloc;
static unsigned long platform_mmiolen;
static uint64_t callback_via;

static unsigned long alloc_xen_mmio(unsigned long len)
{
	unsigned long addr;

	addr = platform_mmio + platform_mmio_alloc;
	platform_mmio_alloc += len;
	BUG_ON(platform_mmio_alloc > platform_mmiolen);

	return addr;
}

static uint64_t get_callback_via(struct pci_dev *pdev)
{
	u8 pin;
	int irq;

	irq = pdev->irq;
	if (irq < 16)
		return irq; /* ISA IRQ */

	pin = pdev->pin;

	/* We don't know the GSI. Specify the PCI INTx line instead. */
	return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
		((uint64_t)pci_domain_nr(pdev->bus) << 32) |
		((uint64_t)pdev->bus->number << 16) |
		((uint64_t)(pdev->devfn & 0xff) << 8) |
		((uint64_t)(pin - 1) & 3);
}

static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
{
	xen_hvm_evtchn_do_upcall();
	return IRQ_HANDLED;
}

static int xen_allocate_irq(struct pci_dev *pdev)
{
	return request_irq(pdev->irq, do_hvm_evtchn_intr,
			IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
			"xen-platform-pci", pdev);
}

static int platform_pci_resume(struct pci_dev *pdev)
{
	int err;
	if (xen_have_vector_callback)
		return 0;
	err = xen_set_callback_via(callback_via);
	if (err) {
		dev_err(&pdev->dev, "platform_pci_resume failure!\n");
		return err;
	}
	return 0;
}

static int platform_pci_init(struct pci_dev *pdev,
			     const struct pci_device_id *ent)
{
	int i, ret;
	long ioaddr;
	long mmio_addr, mmio_len;
	unsigned int max_nr_gframes;
	unsigned long grant_frames;

	if (!xen_domain())
		return -ENODEV;

	i = pci_enable_device(pdev);
	if (i)
		return i;

	ioaddr = pci_resource_start(pdev, 0);

	mmio_addr = pci_resource_start(pdev, 1);
	mmio_len = pci_resource_len(pdev, 1);

	if (mmio_addr == 0 || ioaddr == 0) {
		dev_err(&pdev->dev, "no resources found\n");
		ret = -ENOENT;
		goto pci_out;
	}

	ret = pci_request_region(pdev, 1, DRV_NAME);
	if (ret < 0)
		goto pci_out;

	ret = pci_request_region(pdev, 0, DRV_NAME);
	if (ret < 0)
		goto mem_out;

	platform_mmio = mmio_addr;
	platform_mmiolen = mmio_len;

	if (!xen_have_vector_callback) {
		ret = xen_allocate_irq(pdev);
		if (ret) {
			dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
			goto out;
		}
		callback_via = get_callback_via(pdev);
		ret = xen_set_callback_via(callback_via);
		if (ret) {
			dev_warn(&pdev->dev, "Unable to set the evtchn callback "
					 "err=%d\n", ret);
			goto out;
		}
	}

	max_nr_gframes = gnttab_max_grant_frames();
	grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
	ret = gnttab_setup_auto_xlat_frames(grant_frames);
	if (ret)
		goto out;
	ret = gnttab_init();
	if (ret)
		goto grant_out;
	xenbus_probe(NULL);
	return 0;
grant_out:
	gnttab_free_auto_xlat_frames();
out:
	pci_release_region(pdev, 0);
mem_out:
	pci_release_region(pdev, 1);
pci_out:
	pci_disable_device(pdev);
	return ret;
}

static struct pci_device_id platform_pci_tbl[] = {
	{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}
};

MODULE_DEVICE_TABLE(pci, platform_pci_tbl);

static struct pci_driver platform_driver = {
	.name =           DRV_NAME,
	.probe =          platform_pci_init,
	.id_table =       platform_pci_tbl,
#ifdef CONFIG_PM
	.resume_early =   platform_pci_resume,
#endif
};

static int __init platform_pci_module_init(void)
{
	return pci_register_driver(&platform_driver);
}

module_init(platform_pci_module_init);