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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
30edc14b KRW |
2 | /* |
3 | * PCI Backend - Handle special overlays for broken devices. | |
4 | * | |
5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
6 | * Author: Chris Bookholt <hap10@epoch.ncsc.mil> | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/pci.h> | |
11 | #include "pciback.h" | |
12 | #include "conf_space.h" | |
13 | #include "conf_space_quirks.h" | |
14 | ||
a92336a1 | 15 | LIST_HEAD(xen_pcibk_quirks); |
30edc14b KRW |
16 | static inline const struct pci_device_id * |
17 | match_one_device(const struct pci_device_id *id, const struct pci_dev *dev) | |
18 | { | |
19 | if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) && | |
20 | (id->device == PCI_ANY_ID || id->device == dev->device) && | |
21 | (id->subvendor == PCI_ANY_ID || | |
22 | id->subvendor == dev->subsystem_vendor) && | |
23 | (id->subdevice == PCI_ANY_ID || | |
24 | id->subdevice == dev->subsystem_device) && | |
25 | !((id->class ^ dev->class) & id->class_mask)) | |
26 | return id; | |
27 | return NULL; | |
28 | } | |
29 | ||
a92336a1 | 30 | static struct xen_pcibk_config_quirk *xen_pcibk_find_quirk(struct pci_dev *dev) |
30edc14b | 31 | { |
a92336a1 | 32 | struct xen_pcibk_config_quirk *tmp_quirk; |
30edc14b | 33 | |
a92336a1 | 34 | list_for_each_entry(tmp_quirk, &xen_pcibk_quirks, quirks_list) |
30edc14b KRW |
35 | if (match_one_device(&tmp_quirk->devid, dev) != NULL) |
36 | goto out; | |
37 | tmp_quirk = NULL; | |
a92336a1 | 38 | printk(KERN_DEBUG DRV_NAME |
402c5e15 | 39 | ": quirk didn't match any device known\n"); |
30edc14b KRW |
40 | out: |
41 | return tmp_quirk; | |
42 | } | |
43 | ||
a92336a1 | 44 | static inline void register_quirk(struct xen_pcibk_config_quirk *quirk) |
30edc14b | 45 | { |
a92336a1 | 46 | list_add_tail(&quirk->quirks_list, &xen_pcibk_quirks); |
30edc14b KRW |
47 | } |
48 | ||
a92336a1 | 49 | int xen_pcibk_field_is_dup(struct pci_dev *dev, unsigned int reg) |
30edc14b KRW |
50 | { |
51 | int ret = 0; | |
a92336a1 | 52 | struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev); |
30edc14b KRW |
53 | struct config_field_entry *cfg_entry; |
54 | ||
55 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { | |
56 | if (OFFSET(cfg_entry) == reg) { | |
57 | ret = 1; | |
58 | break; | |
59 | } | |
60 | } | |
61 | return ret; | |
62 | } | |
63 | ||
a92336a1 | 64 | int xen_pcibk_config_quirks_add_field(struct pci_dev *dev, struct config_field |
30edc14b KRW |
65 | *field) |
66 | { | |
67 | int err = 0; | |
68 | ||
69 | switch (field->size) { | |
70 | case 1: | |
a92336a1 KRW |
71 | field->u.b.read = xen_pcibk_read_config_byte; |
72 | field->u.b.write = xen_pcibk_write_config_byte; | |
30edc14b KRW |
73 | break; |
74 | case 2: | |
a92336a1 KRW |
75 | field->u.w.read = xen_pcibk_read_config_word; |
76 | field->u.w.write = xen_pcibk_write_config_word; | |
30edc14b KRW |
77 | break; |
78 | case 4: | |
a92336a1 KRW |
79 | field->u.dw.read = xen_pcibk_read_config_dword; |
80 | field->u.dw.write = xen_pcibk_write_config_dword; | |
30edc14b KRW |
81 | break; |
82 | default: | |
83 | err = -EINVAL; | |
84 | goto out; | |
85 | } | |
86 | ||
a92336a1 | 87 | xen_pcibk_config_add_field(dev, field); |
30edc14b KRW |
88 | |
89 | out: | |
90 | return err; | |
91 | } | |
92 | ||
a92336a1 | 93 | int xen_pcibk_config_quirks_init(struct pci_dev *dev) |
30edc14b | 94 | { |
a92336a1 | 95 | struct xen_pcibk_config_quirk *quirk; |
30edc14b KRW |
96 | int ret = 0; |
97 | ||
98 | quirk = kzalloc(sizeof(*quirk), GFP_ATOMIC); | |
99 | if (!quirk) { | |
100 | ret = -ENOMEM; | |
101 | goto out; | |
102 | } | |
103 | ||
104 | quirk->devid.vendor = dev->vendor; | |
105 | quirk->devid.device = dev->device; | |
106 | quirk->devid.subvendor = dev->subsystem_vendor; | |
107 | quirk->devid.subdevice = dev->subsystem_device; | |
108 | quirk->devid.class = 0; | |
109 | quirk->devid.class_mask = 0; | |
110 | quirk->devid.driver_data = 0UL; | |
111 | ||
112 | quirk->pdev = dev; | |
113 | ||
114 | register_quirk(quirk); | |
115 | out: | |
116 | return ret; | |
117 | } | |
118 | ||
a92336a1 | 119 | void xen_pcibk_config_field_free(struct config_field *field) |
30edc14b KRW |
120 | { |
121 | kfree(field); | |
122 | } | |
123 | ||
a92336a1 | 124 | int xen_pcibk_config_quirk_release(struct pci_dev *dev) |
30edc14b | 125 | { |
a92336a1 | 126 | struct xen_pcibk_config_quirk *quirk; |
30edc14b KRW |
127 | int ret = 0; |
128 | ||
a92336a1 | 129 | quirk = xen_pcibk_find_quirk(dev); |
30edc14b KRW |
130 | if (!quirk) { |
131 | ret = -ENXIO; | |
132 | goto out; | |
133 | } | |
134 | ||
135 | list_del(&quirk->quirks_list); | |
136 | kfree(quirk); | |
137 | ||
138 | out: | |
139 | return ret; | |
140 | } |