summaryrefslogtreecommitdiffstats
path: root/drivers/xen/xen-pciback/conf_space_quirks.c
blob: 89d9744ece613759757fc5bd880b656376b6357c (plain)
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
// SPDX-License-Identifier: GPL-2.0
/*
 * PCI Backend - Handle special overlays for broken devices.
 *
 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
 * Author: Chris Bookholt <hap10@epoch.ncsc.mil>
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include "pciback.h"
#include "conf_space.h"
#include "conf_space_quirks.h"

LIST_HEAD(xen_pcibk_quirks);
static inline const struct pci_device_id *
match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
{
	if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
	    (id->device == PCI_ANY_ID || id->device == dev->device) &&
	    (id->subvendor == PCI_ANY_ID ||
				id->subvendor == dev->subsystem_vendor) &&
	    (id->subdevice == PCI_ANY_ID ||
				id->subdevice == dev->subsystem_device) &&
	    !((id->class ^ dev->class) & id->class_mask))
		return id;
	return NULL;
}

static struct xen_pcibk_config_quirk *xen_pcibk_find_quirk(struct pci_dev *dev)
{
	struct xen_pcibk_config_quirk *tmp_quirk;

	list_for_each_entry(tmp_quirk, &xen_pcibk_quirks, quirks_list)
		if (match_one_device(&tmp_quirk->devid, dev) != NULL)
			goto out;
	tmp_quirk = NULL;
	printk(KERN_DEBUG DRV_NAME
	       ": quirk didn't match any device known\n");
out:
	return tmp_quirk;
}

static inline void register_quirk(struct xen_pcibk_config_quirk *quirk)
{
	list_add_tail(&quirk->quirks_list, &xen_pcibk_quirks);
}

int xen_pcibk_field_is_dup(struct pci_dev *dev, unsigned int reg)
{
	int ret = 0;
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	struct config_field_entry *cfg_entry;

	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
		if (OFFSET(cfg_entry) == reg) {
			ret = 1;
			break;
		}
	}
	return ret;
}

int xen_pcibk_config_quirks_add_field(struct pci_dev *dev, struct config_field
				    *field)
{
	int err = 0;

	switch (field->size) {
	case 1:
		field->u.b.read = xen_pcibk_read_config_byte;
		field->u.b.write = xen_pcibk_write_config_byte;
		break;
	case 2:
		field->u.w.read = xen_pcibk_read_config_word;
		field->u.w.write = xen_pcibk_write_config_word;
		break;
	case 4:
		field->u.dw.read = xen_pcibk_read_config_dword;
		field->u.dw.write = xen_pcibk_write_config_dword;
		break;
	default:
		err = -EINVAL;
		goto out;
	}

	xen_pcibk_config_add_field(dev, field);

out:
	return err;
}

int xen_pcibk_config_quirks_init(struct pci_dev *dev)
{
	struct xen_pcibk_config_quirk *quirk;
	int ret = 0;

	quirk = kzalloc(sizeof(*quirk), GFP_ATOMIC);
	if (!quirk) {
		ret = -ENOMEM;
		goto out;
	}

	quirk->devid.vendor = dev->vendor;
	quirk->devid.device = dev->device;
	quirk->devid.subvendor = dev->subsystem_vendor;
	quirk->devid.subdevice = dev->subsystem_device;
	quirk->devid.class = 0;
	quirk->devid.class_mask = 0;
	quirk->devid.driver_data = 0UL;

	quirk->pdev = dev;

	register_quirk(quirk);
out:
	return ret;
}

void xen_pcibk_config_field_free(struct config_field *field)
{
	kfree(field);
}

int xen_pcibk_config_quirk_release(struct pci_dev *dev)
{
	struct xen_pcibk_config_quirk *quirk;
	int ret = 0;

	quirk = xen_pcibk_find_quirk(dev);
	if (!quirk) {
		ret = -ENXIO;
		goto out;
	}

	list_del(&quirk->quirks_list);
	kfree(quirk);

out:
	return ret;
}