LXR linux/drivers/xen/xen-pciback/conf_space

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