1 // SPDX-License-Identifier: GPL-2.0
3  * PCI Backend - Handles the virtual fields found on the capability lists
26 	 .offset    = PCI_CAP_LIST_ID,
36 	list_add_tail(&cap->cap_list, &capabilities);  in register_capability()
46 		cap_offset = pci_find_capability(dev, cap->capability);  in xen_pcibk_config_capability_add_fields()
48 			dev_dbg(&dev->dev, "Found capability 0x%x at 0x%x\n",  in xen_pcibk_config_capability_add_fields()
49 				cap->capability, cap_offset);  in xen_pcibk_config_capability_add_fields()
57 							       cap->fields,  in xen_pcibk_config_capability_add_fields()
68 static int vpd_address_write(struct pci_dev *dev, int offset, u16 value,  in vpd_address_write()  argument
75 		return pci_write_config_word(dev, offset, value);  in vpd_address_write()
80 	 .offset    = PCI_VPD_ADDR,
86 	 .offset     = PCI_VPD_DATA,
94 static int pm_caps_read(struct pci_dev *dev, int offset, u16 *value,  in pm_caps_read()  argument
100 	err = pci_read_config_word(dev, offset, &real_value);  in pm_caps_read()
111  * Can't allow driver domain to enable PMEs - they're shared */
114 static int pm_ctrl_write(struct pci_dev *dev, int offset, u16 new_value,  in pm_ctrl_write()  argument
121 	err = pci_read_config_word(dev, offset, &old_value);  in pm_ctrl_write()
130 		err = pci_write_config_word(dev, offset, new_value);  in pm_ctrl_write()
136 	dev_dbg(&dev->dev, "set power state to %x\n", new_state);  in pm_ctrl_write()
148 static void *pm_ctrl_init(struct pci_dev *dev, int offset)  in pm_ctrl_init()  argument
153 	err = pci_read_config_word(dev, offset, &value);  in pm_ctrl_init()
159 		err = pci_write_config_word(dev, offset, value);  in pm_ctrl_init()
168 		.offset     = PCI_PM_PMC,
173 		.offset     = PCI_PM_CTRL,
180 		.offset     = PCI_PM_PPB_EXTENSIONS,
185 		.offset     = PCI_PM_DATA_REGISTER,
193 	u16          enable_bit;   /* bit for enabling MSI/MSI-X */
206 static void *msi_field_init(struct pci_dev *dev, int offset)  in msi_field_init()  argument
211 static void *msix_field_init(struct pci_dev *dev, int offset)  in msix_field_init()  argument
216 static int msi_msix_flags_write(struct pci_dev *dev, int offset, u16 new_value,  in msi_msix_flags_write()  argument
224 	if (xen_pcibk_permissive || dev_data->permissive)  in msi_msix_flags_write()
227 	err = pci_read_config_word(dev, offset, &old_value);  in msi_msix_flags_write()
234 	if (!dev_data->allow_interrupt_control ||  in msi_msix_flags_write()
235 	    (new_value ^ old_value) & ~field_config->allowed_bits)  in msi_msix_flags_write()
238 	if (new_value & field_config->enable_bit) {  in msi_msix_flags_write()
241 		 * allow enabling MSI(-X) while INTx is still active to please Linuxes  in msi_msix_flags_write()
242 		 * MSI(-X) startup sequence. It is safe to do, as according to PCI  in msi_msix_flags_write()
243 		 * spec, device with enabled MSI(-X) shouldn't use INTx.  in msi_msix_flags_write()
249 		    int_type == field_config->int_type)  in msi_msix_flags_write()
255 	return pci_write_config_word(dev, offset, new_value);  in msi_msix_flags_write()
260 		.offset    = PCI_MSIX_FLAGS,
271 		.offset    = PCI_MSI_FLAGS,