| /* |
| * 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(pciback_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; |
| } |
| |
| struct pciback_config_quirk *pciback_find_quirk(struct pci_dev *dev) |
| { |
| struct pciback_config_quirk *tmp_quirk; |
| |
| list_for_each_entry(tmp_quirk, &pciback_quirks, quirks_list) |
| if (match_one_device(&tmp_quirk->devid, dev) != NULL) |
| goto out; |
| tmp_quirk = NULL; |
| printk(KERN_DEBUG |
| "quirk didn't match any device pciback knows about\n"); |
| out: |
| return tmp_quirk; |
| } |
| |
| static inline void register_quirk(struct pciback_config_quirk *quirk) |
| { |
| list_add_tail(&quirk->quirks_list, &pciback_quirks); |
| } |
| |
| int pciback_field_is_dup(struct pci_dev *dev, unsigned int reg) |
| { |
| int ret = 0; |
| struct pciback_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 pciback_config_quirks_add_field(struct pci_dev *dev, struct config_field |
| *field) |
| { |
| int err = 0; |
| |
| switch (field->size) { |
| case 1: |
| field->u.b.read = pciback_read_config_byte; |
| field->u.b.write = pciback_write_config_byte; |
| break; |
| case 2: |
| field->u.w.read = pciback_read_config_word; |
| field->u.w.write = pciback_write_config_word; |
| break; |
| case 4: |
| field->u.dw.read = pciback_read_config_dword; |
| field->u.dw.write = pciback_write_config_dword; |
| break; |
| default: |
| err = -EINVAL; |
| goto out; |
| } |
| |
| pciback_config_add_field(dev, field); |
| |
| out: |
| return err; |
| } |
| |
| int pciback_config_quirks_init(struct pci_dev *dev) |
| { |
| struct pciback_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 pciback_config_field_free(struct config_field *field) |
| { |
| kfree(field); |
| } |
| |
| int pciback_config_quirk_release(struct pci_dev *dev) |
| { |
| struct pciback_config_quirk *quirk; |
| int ret = 0; |
| |
| quirk = pciback_find_quirk(dev); |
| if (!quirk) { |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| list_del(&quirk->quirks_list); |
| kfree(quirk); |
| |
| out: |
| return ret; |
| } |