drivers/xen/xen-pciback/conf_space_quirks.c

Source file repositories/reference/linux-study-clean/drivers/xen/xen-pciback/conf_space_quirks.c

File Facts

System
Linux kernel
Corpus path
drivers/xen/xen-pciback/conf_space_quirks.c
Extension
.c
Size
3194 bytes
Lines
143
Domain
Driver Families
Bucket
drivers/xen
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (OFFSET(cfg_entry) == reg) {
			ret = 1;
			break;
		}
	}
	return ret;
}

int xen_pcibk_config_quirks_add_field(struct pci_dev *dev, struct config_field
				    *field)
{
	int err = 0;

	switch (field->size) {
	case 1:
		field->u.b.read = xen_pcibk_read_config_byte;
		field->u.b.write = xen_pcibk_write_config_byte;
		break;
	case 2:
		field->u.w.read = xen_pcibk_read_config_word;
		field->u.w.write = xen_pcibk_write_config_word;
		break;
	case 4:
		field->u.dw.read = xen_pcibk_read_config_dword;
		field->u.dw.write = xen_pcibk_write_config_dword;
		break;
	default:
		err = -EINVAL;
		goto out;
	}

	xen_pcibk_config_add_field(dev, field);

out:
	return err;
}

int xen_pcibk_config_quirks_init(struct pci_dev *dev)
{
	struct xen_pcibk_config_quirk *quirk;
	int ret = 0;

	quirk = kzalloc_obj(*quirk);
	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 xen_pcibk_config_field_free(struct config_field *field)
{
	kfree(field);
}

int xen_pcibk_config_quirk_release(struct pci_dev *dev)
{
	struct xen_pcibk_config_quirk *quirk;
	int ret = 0;

	quirk = xen_pcibk_find_quirk(dev);
	if (!quirk) {
		ret = -ENXIO;
		goto out;
	}

	list_del(&quirk->quirks_list);
	kfree(quirk);

out:
	return ret;
}

Annotation

Implementation Notes