drivers/xen/pciback/conf_space_capability.c

   1 /*
   2  * PCI Backend - Handles the virtual fields found on the capability lists
   3  *               in the configuration space.
   4  *
   5  * Author: Ryan Wilson <hap9@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_capability.h"
  13
  14 static LIST_HEAD(capabilities);
  15
  16 static struct config_field caplist_header[] = {
  17         {
  18          .offset    = PCI_CAP_LIST_ID,
  19          .size      = 2, /* encompass PCI_CAP_LIST_ID & PCI_CAP_LIST_NEXT */
  20          .u.w.read  = pciback_read_config_word,
  21          .u.w.write = NULL,
  22         },
  23         {
  24          .size = 0,
  25         },
  26 };
  27
  28 static inline void register_capability(struct pciback_config_capability *cap)
  29 {
  30         list_add_tail(&cap->cap_list, &capabilities);
  31 }
  32
  33 int pciback_config_capability_add_fields(struct pci_dev *dev)
  34 {
  35         int err = 0;
  36         struct pciback_config_capability *cap;
  37         int cap_offset;
  38
  39         list_for_each_entry(cap, &capabilities, cap_list) {
  40                 cap_offset = pci_find_capability(dev, cap->capability);
  41                 if (cap_offset) {
  42                         dev_dbg(&dev->dev, "Found capability 0x%x at 0x%x\n",
  43                                 cap->capability, cap_offset);
  44
  45                         err = pciback_config_add_fields_offset(dev,
  46                                                                caplist_header,
  47                                                                cap_offset);
  48                         if (err)
  49                                 goto out;
  50                         err = pciback_config_add_fields_offset(dev,
  51                                                                cap->fields,
  52                                                                cap_offset);
  53                         if (err)
  54                                 goto out;
  55                 }
  56         }
  57
  58       out:
  59         return err;
  60 }
  61
  62 extern struct pciback_config_capability pciback_config_capability_vpd;
  63 extern struct pciback_config_capability pciback_config_capability_pm;
  64
  65 int pciback_config_capability_init(void)
  66 {
  67         register_capability(&pciback_config_capability_vpd);
  68         register_capability(&pciback_config_capability_pm);
  69
  70         return 0;
  71 }