1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
58 #include <machine/xen-os.h>
60 #include <machine/hypervisor-ifs.h>
65 #include <machine/xen-public/memory.h>
66 #include <machine/xen-public/io/pciif.h>
69 #include <dev/pci/pcivar.h>
82 #define INVALID_EVTCHN    (-1)
106 	int domain;  member
111 /* Allocate a PCI device structure */
118 	err = sscanf(xdev->nodename, "device/pci/%d", &unit);  in alloc_pdev()
121 			err = -EINVAL;  in alloc_pdev()
122 		xenbus_dev_fatal(pdev->xdev, err, "Error scanning pci device instance number");  in alloc_pdev()
128 		err = -ENOMEM;  in alloc_pdev()
132 	pdev->unit = unit;  in alloc_pdev()
133 	pdev->xdev = xdev;  in alloc_pdev()
134 	pdev->ref_cnt = 1;  in alloc_pdev()
136 	pdev->sh_info = (struct xen_pci_sharedinfo *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT);  in alloc_pdev()
137 	if (pdev->sh_info == NULL) {  in alloc_pdev()
140 		err = -ENOMEM;  in alloc_pdev()
144 	pdev->sh_info->flags = 0;  in alloc_pdev()
146 	xdev->data = pdev;  in alloc_pdev()
148 	mtx_init(&pdev->sh_info_lock, "info_lock", "pci shared dev info lock", MTX_DEF);  in alloc_pdev()
150 	pdev->evtchn = INVALID_EVTCHN;  in alloc_pdev()
151 	pdev->gnt_ref = INVALID_GRANT_REF;  in alloc_pdev()
165 	pdev->ref_cnt++;  in get_pdev()
172 	if (--pdev->ref_cnt > 0)  in put_pdev()
175 	DPRINTF("freeing pdev @ 0x%p (ref_cnt=%d)\n", pdev, pdev->ref_cnt);  in put_pdev()
177 	if (pdev->evtchn != INVALID_EVTCHN)  in put_pdev()
178 		xenbus_free_evtchn(pdev->xdev, pdev->evtchn);  in put_pdev()
180 	if (pdev->gnt_ref != INVALID_GRANT_REF)  in put_pdev()
181 		gnttab_end_foreign_access(pdev->gnt_ref, 0, (void *)pdev->sh_info);  in put_pdev()
183 	pdev->xdev->data = NULL;  in put_pdev()
195 	err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));  in pcifront_publish_info()
201 	pdev->gnt_ref = err;  in pcifront_publish_info()
203 	err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);  in pcifront_publish_info()
210 		xenbus_dev_fatal(pdev->xdev, err,  in pcifront_publish_info()
216 	err = xenbus_printf(trans, pdev->xdev->nodename,  in pcifront_publish_info()
217 						"pci-op-ref", "%u", pdev->gnt_ref);  in pcifront_publish_info()
219 		err = xenbus_printf(trans, pdev->xdev->nodename,  in pcifront_publish_info()
220 							"event-channel", "%u", pdev->evtchn);  in pcifront_publish_info()
222 		err = xenbus_printf(trans, pdev->xdev->nodename,  in pcifront_publish_info()
225 		err = xenbus_switch_state(pdev->xdev, trans,  in pcifront_publish_info()
230 		xenbus_dev_fatal(pdev->xdev, err,  in pcifront_publish_info()
235 		if (err == -EAGAIN)  in pcifront_publish_info()
238 			xenbus_dev_fatal(pdev->xdev, err,  in pcifront_publish_info()
259 		return -1;  in pcifront_connect()
263 	pdev->ndev = BUS_ADD_CHILD(nexus, 0, "xpcife", pdev->unit);  in pcifront_connect()
264 	if (!pdev->ndev) {  in pcifront_connect()
265 		WPRINTF("could not create xpcife%d!\n", pdev->unit);  in pcifront_connect()
266 		return -EFAULT;  in pcifront_connect()
269 	device_set_ivars(pdev->ndev, pdev);  in pcifront_connect()
272 	xenbus_switch_state(pdev->xdev, NULL, XenbusStateConnected);  in pcifront_connect()
274 	printf("pcifront: connected to %s\n", pdev->xdev->nodename);  in pcifront_connect()
277 	device_probe_and_attach(pdev->ndev);  in pcifront_connect()
290 	prev_state = xenbus_read_driver_state(pdev->xdev->nodename);  in pcifront_disconnect()
293 		err = xenbus_switch_state(pdev->xdev, NULL, XenbusStateClosing);  in pcifront_disconnect()
295 			/* TODO - need to detach the newbus devices */  in pcifront_disconnect()
323 /* Remove the xenbus PCI device */
327 	DPRINTF("removing xenbus device node (%s)\n", xdev->nodename);  in pcifront_remove()
328 	if (xdev->data)  in pcifront_remove()
329 		put_pdev(xdev->data);  in pcifront_remove()
338 	struct pcifront_device *pdev = xdev->data;  in pcifront_backend_changed()
342 		DPRINTF("backend closing (%s)\n", xdev->nodename);  in pcifront_backend_changed()
347 		DPRINTF("backend closed (%s)\n", xdev->nodename);  in pcifront_backend_changed()
352 		DPRINTF("backend connected (%s)\n", xdev->nodename);  in pcifront_backend_changed()
361 /* Process PCI operation */
366 	struct xen_pci_op *active_op = &pdev->sh_info->op;  in do_pci_op()
367 	evtchn_port_t port = pdev->evtchn;  in do_pci_op()
370 	mtx_lock(&pdev->sh_info_lock);  in do_pci_op()
376 	set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);  in do_pci_op()
385 	       (_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags)) {  in do_pci_op()
393 				  (unsigned long *)&pdev->sh_info->flags);  in do_pci_op()
401 	err = op->err;  in do_pci_op()
403 	mtx_unlock(&pdev->sh_info_lock);  in do_pci_op()
410 	{ "pci" },
426 	if ((xen_start_info->flags & SIF_INITDOMAIN))  in pcifront_init()
442 	DPRINTF("xpcife probe (unit=%d)\n", pdev->unit);  in SYSINIT()
454 	unsigned int domain, bus;  in xpcife_attach()  local
456 	DPRINTF("xpcife attach (unit=%d)\n", pdev->unit);  in xpcife_attach()
458 	err = xenbus_scanf(NULL, pdev->xdev->otherend,  in xpcife_attach()
462 			err = -EINVAL;  in xpcife_attach()
463 		xenbus_dev_fatal(pdev->xdev, err,  in xpcife_attach()
464 						 "Error reading number of PCI roots");  in xpcife_attach()
472 		len = snprintf(str, sizeof(str), "root-%d", i);  in xpcife_attach()
473 		if (unlikely(len >= (sizeof(str) - 1))) {  in xpcife_attach()
474 			err = -ENOMEM;  in xpcife_attach()
478 		err = xenbus_scanf(NULL, pdev->xdev->otherend, str,  in xpcife_attach()
479 						   "%x:%x", &domain, &bus);  in xpcife_attach()
482 				err = -EINVAL;  in xpcife_attach()
483 			xenbus_dev_fatal(pdev->xdev, err,  in xpcife_attach()
484 							 "Error reading PCI root %d", i);  in xpcife_attach()
488 		if (domain != pdev->xdev->otherend_id) {  in xpcife_attach()
489 			err = -EINVAL;  in xpcife_attach()
490 			xenbus_dev_fatal(pdev->xdev, err,  in xpcife_attach()
491 							 "Domain mismatch %d != %d", domain, pdev->xdev->otherend_id);  in xpcife_attach()
497 			err = -ENOMEM;  in xpcife_attach()
498 			xenbus_dev_fatal(pdev->xdev, err,  in xpcife_attach()
547 	sc->domain = pdev->xdev->otherend_id;  in xpcib_probe()
548 	sc->bus = device_get_unit(dev);  in xpcib_probe()
549 	sc->pdev = pdev;  in xpcib_probe()
560 	DPRINTF("xpcib attach (bus=%d)\n", sc->bus);  in xpcib_attach()
562 	device_add_child(dev, "pci", DEVICE_UNIT_ANY);  in xpcib_attach()
573 		*result = sc->bus;  in xpcib_read_ivar()
596 		.domain = sc->domain,  in xpcib_read_config()
597 		.bus    = sc->bus,  in xpcib_read_config()
604 	err = do_pci_op(sc->pdev, &op);  in xpcib_read_config()
623 		.domain = sc->domain,  in xpcib_write_config()
624 		.bus    = sc->bus,  in xpcib_write_config()
632 	err = do_pci_op(sc->pdev, &op);  in xpcib_write_config()
642 	pcicfgregs *cfg = &dinfo->cfg;  in xpcib_route_interrupt()
644 	DPRINTF("route intr (pin=%d, line=%d)\n", pin, cfg->intline);  in xpcib_route_interrupt()
646 	return cfg->intline;  in xpcib_route_interrupt()
685  * c-set-style: "BSD"
686  * c-basic-offset: 4
687  * tab-width: 4
688  * indent-tabs-mode: t