1 // SPDX-License-Identifier: GPL-2.0
20 #include <linux/pci.h>
33 /* zpci_bus_prepare_device - Prepare a zPCI function for scanning
36  * The PCI resources for the function are set up and added to its zbus and the
38  * a PCI bus created. If an error occurs the zPCI function is not enabled.
52 	if (!zdev->has_resources) {  in zpci_bus_prepare_device()
55 			if (zdev->bars[i].res)  in zpci_bus_prepare_device()
56 				pci_bus_add_resource(zdev->zbus->bus, zdev->bars[i].res);  in zpci_bus_prepare_device()
63 /* zpci_bus_scan_device - Scan a single device adding it to the PCI core
66  * Scans the PCI function making it available to the common PCI code.
79 	pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);  in zpci_bus_scan_device()
81 		return -ENODEV;  in zpci_bus_scan_device()
90 /* zpci_bus_remove_device - Removes the given zdev from the PCI core
91  * @zdev: the zdev to be removed from the PCI core
96  * API but is removed from the common code PCI bus, making it
101 	struct zpci_bus *zbus = zdev->zbus;  in zpci_bus_remove_device()
104 	if (!zdev->zbus->bus)  in zpci_bus_remove_device()
107 	pdev = pci_get_slot(zbus->bus, zdev->devfn);  in zpci_bus_remove_device()
110 			pdev->error_state = pci_channel_io_perm_failure;  in zpci_bus_remove_device()
111 		if (pdev->is_virtfn) {  in zpci_bus_remove_device()
112 			zpci_iov_remove_virtfn(pdev, zdev->vfn);  in zpci_bus_remove_device()
123 /* zpci_bus_scan_bus - Scan all configured zPCI functions on the bus
126  * Enables and scans all PCI functions on the bus making them available to the
127  * common PCI code. If a PCI function fails to be initialized an error will be
138 		zdev = zbus->function[devfn];  in zpci_bus_scan_bus()
139 		if (zdev && zdev->state == ZPCI_FN_STATE_CONFIGURED) {  in zpci_bus_scan_bus()
142 				ret = -EIO;  in zpci_bus_scan_bus()
147 	pci_scan_child_bus(zbus->bus);  in zpci_bus_scan_bus()
148 	pci_bus_add_devices(zbus->bus);  in zpci_bus_scan_bus()
154 /* zpci_bus_scan_busses - Scan all registered busses
173 	return !s390_pci_no_rid && zdev->rid_available &&  in zpci_bus_is_multifunction_root()
174 		!zdev->vfn;  in zpci_bus_is_multifunction_root()
177 /* zpci_bus_create_pci_bus - Create the PCI bus associated with this zbus
179  * @fr: PCI root function that will determine the bus's domain, and bus speed
180  * @ops: the pci operations
182  * The PCI function @fr determines the domain (its UID), multifunction property
190 	int domain;  in zpci_bus_create_pci_bus()  local
192 	domain = zpci_alloc_domain((u16)fr->uid);  in zpci_bus_create_pci_bus()
193 	if (domain < 0)  in zpci_bus_create_pci_bus()
194 		return domain;  in zpci_bus_create_pci_bus()
196 	zbus->domain_nr = domain;  in zpci_bus_create_pci_bus()
197 	zbus->multifunction = zpci_bus_is_multifunction_root(fr);  in zpci_bus_create_pci_bus()
198 	zbus->max_bus_speed = fr->max_bus_speed;  in zpci_bus_create_pci_bus()
201 	 * Note that the zbus->resources are taken over and zbus->resources  in zpci_bus_create_pci_bus()
204 	bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, ops, zbus, &zbus->resources);  in zpci_bus_create_pci_bus()
206 		zpci_free_domain(zbus->domain_nr);  in zpci_bus_create_pci_bus()
207 		return -EFAULT;  in zpci_bus_create_pci_bus()
210 	zbus->bus = bus;  in zpci_bus_create_pci_bus()
219 	if (zbus->bus) {  in zpci_bus_release()
221 		pci_stop_root_bus(zbus->bus);  in zpci_bus_release()
223 		zpci_free_domain(zbus->domain_nr);  in zpci_bus_release()
224 		pci_free_resource_list(&zbus->resources);  in zpci_bus_release()
226 		pci_remove_root_bus(zbus->bus);  in zpci_bus_release()
231 	list_del(&zbus->bus_next);  in zpci_bus_release()
238 	kref_put(&zbus->kref, zpci_bus_release);  in zpci_bus_put()
247 		if (!zbus->multifunction)  in zpci_bus_get()
249 		if (topo_is_tid == zbus->topo_is_tid && topo == zbus->topo) {  in zpci_bus_get()
250 			kref_get(&zbus->kref);  in zpci_bus_get()
268 	zbus->topo = topo;  in zpci_bus_alloc()
269 	zbus->topo_is_tid = topo_is_tid;  in zpci_bus_alloc()
270 	INIT_LIST_HEAD(&zbus->bus_next);  in zpci_bus_alloc()
272 	list_add_tail(&zbus->bus_next, &zbus_list);  in zpci_bus_alloc()
275 	kref_init(&zbus->kref);  in zpci_bus_alloc()
276 	INIT_LIST_HEAD(&zbus->resources);  in zpci_bus_alloc()
278 	zbus->bus_resource.start = 0;  in zpci_bus_alloc()
279 	zbus->bus_resource.end = ZPCI_BUS_NR;  in zpci_bus_alloc()
280 	zbus->bus_resource.flags = IORESOURCE_BUS;  in zpci_bus_alloc()
281 	pci_add_resource(&zbus->resources, &zbus->bus_resource);  in zpci_bus_alloc()
291 	 * With pdev->no_vf_scan the common PCI probing code does not  in pcibios_bus_add_device()
294 	if (zdev->vfn) {  in pcibios_bus_add_device()
295 		zpci_iov_setup_virtfn(zdev->zbus, pdev, zdev->vfn);  in pcibios_bus_add_device()
296 		pdev->no_command_memory = 1;  in pcibios_bus_add_device()
302 	int rc = -EINVAL;  in zpci_bus_add_device()
304 	if (zbus->multifunction) {  in zpci_bus_add_device()
305 		if (!zdev->rid_available) {  in zpci_bus_add_device()
309 		zdev->devfn = zdev->rid & ZPCI_RID_MASK_DEVFN;  in zpci_bus_add_device()
312 	if (zbus->function[zdev->devfn]) {  in zpci_bus_add_device()
313 		pr_err("devfn %04x is already assigned\n", zdev->devfn);  in zpci_bus_add_device()
316 	zdev->zbus = zbus;  in zpci_bus_add_device()
317 	zbus->function[zdev->devfn] = zdev;  in zpci_bus_add_device()
323 	zdev->has_hp_slot = 1;  in zpci_bus_add_device()
328 	zbus->function[zdev->devfn] = NULL;  in zpci_bus_add_device()
329 	zdev->zbus = NULL;  in zpci_bus_add_device()
330 	zpci_nb_devices--;  in zpci_bus_add_device()
347 	bool topo_is_tid = zdev->tid_avail;  in zpci_bus_device_register()
349 	int topo, rc = -EBADF;  in zpci_bus_device_register()
352 		pr_warn("Adding PCI function %08x failed because the configured limit of %d is reached\n",  in zpci_bus_device_register()
353 			zdev->fid, ZPCI_NR_DEVICES);  in zpci_bus_device_register()
354 		return -ENOSPC;  in zpci_bus_device_register()
357 	topo = topo_is_tid ? zdev->tid : zdev->pchid;  in zpci_bus_device_register()
360 	 * An isolated VF gets its own domain/bus even if there exists  in zpci_bus_device_register()
361 	 * a matching domain/bus already  in zpci_bus_device_register()
371 			return -ENOMEM;  in zpci_bus_device_register()
374 	if (!zbus->bus) {  in zpci_bus_device_register()
375 		/* The UID of the first PCI function registered with a zpci_bus  in zpci_bus_device_register()
376 		 * is used as the domain number for that bus. Currently there  in zpci_bus_device_register()
377 		 * is exactly one zpci_bus per domain.  in zpci_bus_device_register()
391 	pr_err("Adding PCI function %08x failed\n", zdev->fid);  in zpci_bus_device_register()
398 	struct zpci_bus *zbus = zdev->zbus;  in zpci_bus_device_unregister()
400 	zpci_nb_devices--;  in zpci_bus_device_unregister()
401 	zbus->function[zdev->devfn] = NULL;  in zpci_bus_device_unregister()