drivers/xen/pciback/conf_space_quirks.c

   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
  14 LIST_HEAD(pciback_quirks);
  15
  16 struct pciback_config_quirk *pciback_find_quirk(struct pci_dev *dev)
  17 {
  18         struct pciback_config_quirk *tmp_quirk;
  19
  20         list_for_each_entry(tmp_quirk, &pciback_quirks, quirks_list)
  21             if (pci_match_id(&tmp_quirk->devid, dev))
  22                 goto out;
  23         tmp_quirk = NULL;
  24         printk(KERN_DEBUG
  25                "quirk didn't match any device pciback knows about\n");
  26       out:
  27         return tmp_quirk;
  28 }
  29
  30 static inline void register_quirk(struct pciback_config_quirk *quirk)
  31 {
  32         list_add_tail(&quirk->quirks_list, &pciback_quirks);
  33 }
  34
  35 int pciback_field_is_dup(struct pci_dev *dev, unsigned int reg)
  36 {
  37         int ret = 0;
  38         struct pciback_dev_data *dev_data = pci_get_drvdata(dev);
  39         struct config_field_entry *cfg_entry;
  40
  41         list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
  42                 if ( OFFSET(cfg_entry) == reg) {
  43                         ret = 1;
  44                         break;
  45                 }
  46         }
  47         return ret;
  48 }
  49
  50 int pciback_config_quirks_add_field(struct pci_dev *dev, struct config_field
  51                                     *field)
  52 {
  53         int err = 0;
  54
  55         switch (field->size) {
  56         case 1:
  57                 field->u.b.read = pciback_read_config_byte;
  58                 field->u.b.write = pciback_write_config_byte;
  59                 break;
  60         case 2:
  61                 field->u.w.read = pciback_read_config_word;
  62                 field->u.w.write = pciback_write_config_word;
  63                 break;
  64         case 4:
  65                 field->u.dw.read = pciback_read_config_dword;
  66                 field->u.dw.write = pciback_write_config_dword;
  67                 break;
  68         default:
  69                 err = -EINVAL;
  70                 goto out;
  71         }
  72
  73         pciback_config_add_field(dev, field);
  74
  75       out:
  76         return err;
  77 }
  78
  79 int pciback_config_quirks_init(struct pci_dev *dev)
  80 {
  81         struct pciback_config_quirk *quirk;
  82         int ret = 0;
  83
  84         quirk = kzalloc(sizeof(*quirk), GFP_ATOMIC);
  85         if (!quirk) {
  86                 ret = -ENOMEM;
  87                 goto out;
  88         }
  89
  90         quirk->devid.vendor = dev->vendor;
  91         quirk->devid.device = dev->device;
  92         quirk->devid.subvendor = dev->subsystem_vendor;
  93         quirk->devid.subdevice = dev->subsystem_device;
  94         quirk->devid.class = 0;
  95         quirk->devid.class_mask = 0;
  96         quirk->devid.driver_data = 0UL;
  97
  98         quirk->pdev = dev;
  99
 100         register_quirk(quirk);
 101       out:
 102         return ret;
 103 }
 104
 105 void pciback_config_field_free(struct config_field *field)
 106 {
 107         kfree(field);
 108 }
 109
 110 int pciback_config_quirk_release(struct pci_dev *dev)
 111 {
 112         struct pciback_config_quirk *quirk;
 113         int ret = 0;
 114
 115         quirk = pciback_find_quirk(dev);
 116         if (!quirk) {
 117                 ret = -ENXIO;
 118                 goto out;
 119         }
 120
 121         list_del(&quirk->quirks_list);
 122         kfree(quirk);
 123
 124       out:
 125         return ret;
 126 }