1 // SPDX-License-Identifier: GPL-2.0
3  * PCI Backend - Functions for creating a virtual configuration space for
7  *               restrict changes to certain PCI Configuration registers:
47 	const struct config_field *field = entry->field;  in DEFINE_PCI_CONFIG()
51 	switch (field->size) {  in DEFINE_PCI_CONFIG()
53 		if (field->u.b.read)  in DEFINE_PCI_CONFIG()
54 			ret = field->u.b.read(dev, offset, (u8 *) value,  in DEFINE_PCI_CONFIG()
55 					      entry->data);  in DEFINE_PCI_CONFIG()
58 		if (field->u.w.read)  in DEFINE_PCI_CONFIG()
59 			ret = field->u.w.read(dev, offset, (u16 *) value,  in DEFINE_PCI_CONFIG()
60 					      entry->data);  in DEFINE_PCI_CONFIG()
63 		if (field->u.dw.read)  in DEFINE_PCI_CONFIG()
64 			ret = field->u.dw.read(dev, offset, value, entry->data);  in DEFINE_PCI_CONFIG()
75 	const struct config_field *field = entry->field;  in conf_space_write()
77 	switch (field->size) {  in conf_space_write()
79 		if (field->u.b.write)  in conf_space_write()
80 			ret = field->u.b.write(dev, offset, (u8) value,  in conf_space_write()
81 					       entry->data);  in conf_space_write()
84 		if (field->u.w.write)  in conf_space_write()
85 			ret = field->u.w.write(dev, offset, (u16) value,  in conf_space_write()
86 					       entry->data);  in conf_space_write()
89 		if (field->u.dw.write)  in conf_space_write()
90 			ret = field->u.dw.write(dev, offset, value,  in conf_space_write()
91 						entry->data);  in conf_space_write()
109 	/* Validate request (no un-aligned requests) */  in valid_request()
122 		new_val_mask >>= (offset * -8);  in merge_value()
123 		new_val >>= (offset * -8);  in merge_value()
159 	dev_dbg(&dev->dev, "read %d bytes at 0x%x\n", size, offset);  in xen_pcibk_config_read()
179 	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {  in xen_pcibk_config_read()
180 		field = cfg_entry->field;  in xen_pcibk_config_read()
183 		field_end = OFFSET(cfg_entry) + field->size;  in xen_pcibk_config_read()
192 					    get_mask(field->size),  in xen_pcibk_config_read()
193 					    field_start - offset);  in xen_pcibk_config_read()
198 	dev_dbg(&dev->dev, "read %d bytes at 0x%x = %x\n", size, offset, value);  in xen_pcibk_config_read()
213 	dev_dbg(&dev->dev, "write request %d bytes at 0x%x = %x\n",  in xen_pcibk_config_write()
219 	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {  in xen_pcibk_config_write()
220 		field = cfg_entry->field;  in xen_pcibk_config_write()
223 		field_end = OFFSET(cfg_entry) + field->size;  in xen_pcibk_config_write()
232 					      offset - field_start);  in xen_pcibk_config_write()
249 		 * read-only. The permissive flag changes this behavior so  in xen_pcibk_config_write()
251 		 * This means that some fields may still be read-only because  in xen_pcibk_config_write()
254 		if (dev_data->permissive || xen_pcibk_permissive) {  in xen_pcibk_config_write()
269 		} else if (!dev_data->warned_on_write) {  in xen_pcibk_config_write()
270 			dev_data->warned_on_write = 1;  in xen_pcibk_config_write()
271 			dev_warn(&dev->dev, "Driver tried to write to a "  in xen_pcibk_config_write()
272 				 "read-only configuration space field at offset"  in xen_pcibk_config_write()
276 				 "2) report problems to the xen-devel "  in xen_pcibk_config_write()
292 	 * Do not trust dev->msi(x)_enabled here, as enabling could be done  in xen_pcibk_get_interrupt_type()
295 	if (dev->msi_cap) {  in xen_pcibk_get_interrupt_type()
297 				dev->msi_cap + PCI_MSI_FLAGS,  in xen_pcibk_get_interrupt_type()
304 	if (dev->msix_cap) {  in xen_pcibk_get_interrupt_type()
306 				dev->msix_cap + PCI_MSIX_FLAGS,  in xen_pcibk_get_interrupt_type()
315 	 * PCIe spec says device cannot use INTx if MSI/MSI-X is enabled,  in xen_pcibk_get_interrupt_type()
335 	dev_dbg(&dev->dev, "free-ing dynamically allocated virtual "  in xen_pcibk_config_free_dyn_fields()
336 			   "configuration space fields\n");  in xen_pcibk_config_free_dyn_fields()
340 	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {  in xen_pcibk_config_free_dyn_fields()
341 		field = cfg_entry->field;  in xen_pcibk_config_free_dyn_fields()
343 		if (field->clean) {  in xen_pcibk_config_free_dyn_fields()
344 			field->clean((struct config_field *)field);  in xen_pcibk_config_free_dyn_fields()
346 			kfree(cfg_entry->data);  in xen_pcibk_config_free_dyn_fields()
348 			list_del(&cfg_entry->list);  in xen_pcibk_config_free_dyn_fields()
361 	dev_dbg(&dev->dev, "resetting virtual configuration space\n");  in xen_pcibk_config_reset_dev()
365 	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {  in xen_pcibk_config_reset_dev()
366 		field = cfg_entry->field;  in xen_pcibk_config_reset_dev()
368 		if (field->reset)  in xen_pcibk_config_reset_dev()
369 			field->reset(dev, OFFSET(cfg_entry), cfg_entry->data);  in xen_pcibk_config_reset_dev()
379 	dev_dbg(&dev->dev, "free-ing virtual configuration space fields\n");  in xen_pcibk_config_free_dev()
383 	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {  in xen_pcibk_config_free_dev()
384 		list_del(&cfg_entry->list);  in xen_pcibk_config_free_dev()
386 		field = cfg_entry->field;  in xen_pcibk_config_free_dev()
388 		if (field->release)  in xen_pcibk_config_free_dev()
389 			field->release(dev, OFFSET(cfg_entry), cfg_entry->data);  in xen_pcibk_config_free_dev()
406 		err = -ENOMEM;  in xen_pcibk_config_add_field_offset()
410 	cfg_entry->data = NULL;  in xen_pcibk_config_add_field_offset()
411 	cfg_entry->field = field;  in xen_pcibk_config_add_field_offset()
412 	cfg_entry->base_offset = base_offset;  in xen_pcibk_config_add_field_offset()
419 	if (field->init) {  in xen_pcibk_config_add_field_offset()
420 		tmp = field->init(dev, OFFSET(cfg_entry));  in xen_pcibk_config_add_field_offset()
427 		cfg_entry->data = tmp;  in xen_pcibk_config_add_field_offset()
430 	dev_dbg(&dev->dev, "added config field at offset 0x%02x\n",  in xen_pcibk_config_add_field_offset()
432 	list_add_tail(&cfg_entry->list, &dev_data->config_fields);  in xen_pcibk_config_add_field_offset()
441 /* This sets up the device's virtual configuration space to keep track of
450 	dev_dbg(&dev->dev, "initializing virtual configuration space\n");  in xen_pcibk_config_init_dev()
452 	INIT_LIST_HEAD(&dev_data->config_fields);  in xen_pcibk_config_init_dev()