141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI Backend - Handle special overlays for broken devices.
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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* Author: Chris Bookholt <hap10@epoch.ncsc.mil>
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include "pciback.h"
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#include "conf_space.h"
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#include "conf_space_quirks.h"
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LIST_HEAD(xen_pcibk_quirks);
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static inline const struct pci_device_id *
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match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
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{
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if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
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(id->device == PCI_ANY_ID || id->device == dev->device) &&
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(id->subvendor == PCI_ANY_ID ||
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id->subvendor == dev->subsystem_vendor) &&
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(id->subdevice == PCI_ANY_ID ||
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id->subdevice == dev->subsystem_device) &&
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!((id->class ^ dev->class) & id->class_mask))
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return id;
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return NULL;
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}
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static struct xen_pcibk_config_quirk *xen_pcibk_find_quirk(struct pci_dev *dev)
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{
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struct xen_pcibk_config_quirk *tmp_quirk;
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list_for_each_entry(tmp_quirk, &xen_pcibk_quirks, quirks_list)
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if (match_one_device(&tmp_quirk->devid, dev) != NULL)
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goto out;
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tmp_quirk = NULL;
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printk(KERN_DEBUG DRV_NAME
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": quirk didn't match any device known\n");
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out:
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return tmp_quirk;
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}
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static inline void register_quirk(struct xen_pcibk_config_quirk *quirk)
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{
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list_add_tail(&quirk->quirks_list, &xen_pcibk_quirks);
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}
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int xen_pcibk_field_is_dup(struct pci_dev *dev, unsigned int reg)
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{
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int ret = 0;
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struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
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struct config_field_entry *cfg_entry;
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list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
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if (OFFSET(cfg_entry) == reg) {
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ret = 1;
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break;
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}
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}
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return ret;
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}
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int xen_pcibk_config_quirks_add_field(struct pci_dev *dev, struct config_field
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*field)
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{
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int err = 0;
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switch (field->size) {
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case 1:
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field->u.b.read = xen_pcibk_read_config_byte;
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field->u.b.write = xen_pcibk_write_config_byte;
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break;
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case 2:
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field->u.w.read = xen_pcibk_read_config_word;
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field->u.w.write = xen_pcibk_write_config_word;
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break;
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case 4:
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field->u.dw.read = xen_pcibk_read_config_dword;
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field->u.dw.write = xen_pcibk_write_config_dword;
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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xen_pcibk_config_add_field(dev, field);
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out:
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return err;
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}
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int xen_pcibk_config_quirks_init(struct pci_dev *dev)
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{
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struct xen_pcibk_config_quirk *quirk;
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int ret = 0;
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quirk = kzalloc(sizeof(*quirk), GFP_KERNEL);
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if (!quirk) {
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ret = -ENOMEM;
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goto out;
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}
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quirk->devid.vendor = dev->vendor;
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quirk->devid.device = dev->device;
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quirk->devid.subvendor = dev->subsystem_vendor;
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quirk->devid.subdevice = dev->subsystem_device;
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quirk->devid.class = 0;
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quirk->devid.class_mask = 0;
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quirk->devid.driver_data = 0UL;
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quirk->pdev = dev;
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register_quirk(quirk);
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out:
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return ret;
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}
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void xen_pcibk_config_field_free(struct config_field *field)
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{
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kfree(field);
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}
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int xen_pcibk_config_quirk_release(struct pci_dev *dev)
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{
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struct xen_pcibk_config_quirk *quirk;
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int ret = 0;
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quirk = xen_pcibk_find_quirk(dev);
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if (!quirk) {
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ret = -ENXIO;
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goto out;
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}
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list_del(&quirk->quirks_list);
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kfree(quirk);
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out:
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return ret;
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}
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