diff options
Diffstat (limited to 'hw/usb/xen-usb.c')
| -rw-r--r-- | hw/usb/xen-usb.c | 1097 |
1 files changed, 1097 insertions, 0 deletions
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c new file mode 100644 index 000000000..0f7369e7e --- /dev/null +++ b/hw/usb/xen-usb.c @@ -0,0 +1,1097 @@ +/* + * xen paravirt usb device backend + * + * (c) Juergen Gross <jgross@suse.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; under version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + * + * Contributions after 2012-01-13 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. + */ + +#include "qemu/osdep.h" +#include <libusb.h> +#include <sys/user.h> + +#include "qemu/config-file.h" +#include "qemu/main-loop.h" +#include "qemu/option.h" +#include "hw/usb.h" +#include "hw/xen/xen-legacy-backend.h" +#include "monitor/qdev.h" +#include "qapi/error.h" +#include "qapi/qmp/qdict.h" +#include "qapi/qmp/qstring.h" + +#include "hw/xen/interface/io/usbif.h" + +/* + * Check for required support of usbif.h: USBIF_SHORT_NOT_OK was the last + * macro added we rely on. + */ +#ifdef USBIF_SHORT_NOT_OK + +#define TR(xendev, lvl, fmt, args...) \ + { \ + struct timeval tv; \ + \ + gettimeofday(&tv, NULL); \ + xen_pv_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt, \ + tv.tv_sec, tv.tv_usec, __func__, ##args); \ + } +#define TR_BUS(xendev, fmt, args...) TR(xendev, 2, fmt, ##args) +#define TR_REQ(xendev, fmt, args...) TR(xendev, 3, fmt, ##args) + +#define USBBACK_MAXPORTS USBIF_PIPE_PORT_MASK +#define USB_DEV_ADDR_SIZE (USBIF_PIPE_DEV_MASK + 1) + +/* USB wire protocol: structure describing control request parameter. */ +struct usbif_ctrlrequest { + uint8_t bRequestType; + uint8_t bRequest; + uint16_t wValue; + uint16_t wIndex; + uint16_t wLength; +}; + +struct usbback_info; +struct usbback_req; + +struct usbback_stub { + USBDevice *dev; + USBPort port; + unsigned int speed; + bool attached; + QTAILQ_HEAD(, usbback_req) submit_q; +}; + +struct usbback_req { + struct usbback_info *usbif; + struct usbback_stub *stub; + struct usbif_urb_request req; + USBPacket packet; + + unsigned int nr_buffer_segs; /* # of transfer_buffer segments */ + unsigned int nr_extra_segs; /* # of iso_frame_desc segments */ + + QTAILQ_ENTRY(usbback_req) q; + + void *buffer; + void *isoc_buffer; + struct libusb_transfer *xfer; + + bool cancelled; +}; + +struct usbback_hotplug { + QSIMPLEQ_ENTRY(usbback_hotplug) q; + unsigned port; +}; + +struct usbback_info { + struct XenLegacyDevice xendev; /* must be first */ + USBBus bus; + void *urb_sring; + void *conn_sring; + struct usbif_urb_back_ring urb_ring; + struct usbif_conn_back_ring conn_ring; + int num_ports; + int usb_ver; + bool ring_error; + QTAILQ_HEAD(, usbback_req) req_free_q; + QSIMPLEQ_HEAD(, usbback_hotplug) hotplug_q; + struct usbback_stub ports[USBBACK_MAXPORTS]; + struct usbback_stub *addr_table[USB_DEV_ADDR_SIZE]; + QEMUBH *bh; +}; + +static struct usbback_req *usbback_get_req(struct usbback_info *usbif) +{ + struct usbback_req *usbback_req; + + if (QTAILQ_EMPTY(&usbif->req_free_q)) { + usbback_req = g_new0(struct usbback_req, 1); + } else { + usbback_req = QTAILQ_FIRST(&usbif->req_free_q); + QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q); + } + return usbback_req; +} + +static void usbback_put_req(struct usbback_req *usbback_req) +{ + struct usbback_info *usbif; + + usbif = usbback_req->usbif; + memset(usbback_req, 0, sizeof(*usbback_req)); + QTAILQ_INSERT_HEAD(&usbif->req_free_q, usbback_req, q); +} + +static int usbback_gnttab_map(struct usbback_req *usbback_req) +{ + unsigned int nr_segs, i, prot; + uint32_t ref[USBIF_MAX_SEGMENTS_PER_REQUEST]; + struct usbback_info *usbif = usbback_req->usbif; + struct XenLegacyDevice *xendev = &usbif->xendev; + struct usbif_request_segment *seg; + void *addr; + + nr_segs = usbback_req->nr_buffer_segs + usbback_req->nr_extra_segs; + if (!nr_segs) { + return 0; + } + + if (nr_segs > USBIF_MAX_SEGMENTS_PER_REQUEST) { + xen_pv_printf(xendev, 0, "bad number of segments in request (%d)\n", + nr_segs); + return -EINVAL; + } + + for (i = 0; i < nr_segs; i++) { + if ((unsigned)usbback_req->req.seg[i].offset + + (unsigned)usbback_req->req.seg[i].length > XC_PAGE_SIZE) { + xen_pv_printf(xendev, 0, "segment crosses page boundary\n"); + return -EINVAL; + } + } + + if (usbback_req->nr_buffer_segs) { + prot = PROT_READ; + if (usbif_pipein(usbback_req->req.pipe)) { + prot |= PROT_WRITE; + } + for (i = 0; i < usbback_req->nr_buffer_segs; i++) { + ref[i] = usbback_req->req.seg[i].gref; + } + usbback_req->buffer = + xen_be_map_grant_refs(xendev, ref, usbback_req->nr_buffer_segs, + prot); + + if (!usbback_req->buffer) { + return -ENOMEM; + } + + for (i = 0; i < usbback_req->nr_buffer_segs; i++) { + seg = usbback_req->req.seg + i; + addr = usbback_req->buffer + i * XC_PAGE_SIZE + seg->offset; + qemu_iovec_add(&usbback_req->packet.iov, addr, seg->length); + } + } + + if (!usbif_pipeisoc(usbback_req->req.pipe)) { + return 0; + } + + /* + * Right now isoc requests are not supported. + * Prepare supporting those by doing the work needed on the guest + * interface side. + */ + + if (!usbback_req->nr_extra_segs) { + xen_pv_printf(xendev, 0, "iso request without descriptor segments\n"); + return -EINVAL; + } + + prot = PROT_READ | PROT_WRITE; + for (i = 0; i < usbback_req->nr_extra_segs; i++) { + ref[i] = usbback_req->req.seg[i + usbback_req->req.nr_buffer_segs].gref; + } + usbback_req->isoc_buffer = + xen_be_map_grant_refs(xendev, ref, usbback_req->nr_extra_segs, + prot); + + if (!usbback_req->isoc_buffer) { + return -ENOMEM; + } + + return 0; +} + +static int usbback_init_packet(struct usbback_req *usbback_req) +{ + struct XenLegacyDevice *xendev = &usbback_req->usbif->xendev; + USBPacket *packet = &usbback_req->packet; + USBDevice *dev = usbback_req->stub->dev; + USBEndpoint *ep; + unsigned int pid, ep_nr; + bool sok; + int ret = 0; + + qemu_iovec_init(&packet->iov, USBIF_MAX_SEGMENTS_PER_REQUEST); + pid = usbif_pipein(usbback_req->req.pipe) ? USB_TOKEN_IN : USB_TOKEN_OUT; + ep_nr = usbif_pipeendpoint(usbback_req->req.pipe); + sok = !!(usbback_req->req.transfer_flags & USBIF_SHORT_NOT_OK); + if (usbif_pipectrl(usbback_req->req.pipe)) { + ep_nr = 0; + sok = false; + } + ep = usb_ep_get(dev, pid, ep_nr); + usb_packet_setup(packet, pid, ep, 0, 1, sok, true); + + switch (usbif_pipetype(usbback_req->req.pipe)) { + case USBIF_PIPE_TYPE_ISOC: + TR_REQ(xendev, "iso transfer %s: buflen: %x, %d frames\n", + (pid == USB_TOKEN_IN) ? "in" : "out", + usbback_req->req.buffer_length, + usbback_req->req.u.isoc.nr_frame_desc_segs); + ret = -EINVAL; /* isoc not implemented yet */ + break; + + case USBIF_PIPE_TYPE_INT: + TR_REQ(xendev, "int transfer %s: buflen: %x\n", + (pid == USB_TOKEN_IN) ? "in" : "out", + usbback_req->req.buffer_length); + break; + + case USBIF_PIPE_TYPE_CTRL: + packet->parameter = *(uint64_t *)usbback_req->req.u.ctrl; + TR_REQ(xendev, "ctrl parameter: %"PRIx64", buflen: %x\n", + packet->parameter, + usbback_req->req.buffer_length); + break; + + case USBIF_PIPE_TYPE_BULK: + TR_REQ(xendev, "bulk transfer %s: buflen: %x\n", + (pid == USB_TOKEN_IN) ? "in" : "out", + usbback_req->req.buffer_length); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static void usbback_do_response(struct usbback_req *usbback_req, int32_t status, + int32_t actual_length, int32_t error_count) +{ + struct usbback_info *usbif; + struct usbif_urb_response *res; + struct XenLegacyDevice *xendev; + unsigned int notify; + + usbif = usbback_req->usbif; + xendev = &usbif->xendev; + + TR_REQ(xendev, "id %d, status %d, length %d, errcnt %d\n", + usbback_req->req.id, status, actual_length, error_count); + + if (usbback_req->packet.iov.iov) { + qemu_iovec_destroy(&usbback_req->packet.iov); + } + + if (usbback_req->buffer) { + xen_be_unmap_grant_refs(xendev, usbback_req->buffer, + usbback_req->nr_buffer_segs); + usbback_req->buffer = NULL; + } + + if (usbback_req->isoc_buffer) { + xen_be_unmap_grant_refs(xendev, usbback_req->isoc_buffer, + usbback_req->nr_extra_segs); + usbback_req->isoc_buffer = NULL; + } + + if (usbif->urb_sring) { + res = RING_GET_RESPONSE(&usbif->urb_ring, usbif->urb_ring.rsp_prod_pvt); + res->id = usbback_req->req.id; + res->status = status; + res->actual_length = actual_length; + res->error_count = error_count; + res->start_frame = 0; + usbif->urb_ring.rsp_prod_pvt++; + RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify); + + if (notify) { + xen_pv_send_notify(xendev); + } + } + + if (!usbback_req->cancelled) + usbback_put_req(usbback_req); +} + +static void usbback_do_response_ret(struct usbback_req *usbback_req, + int32_t status) +{ + usbback_do_response(usbback_req, status, 0, 0); +} + +static int32_t usbback_xlat_status(int status) +{ + switch (status) { + case USB_RET_SUCCESS: + return 0; + case USB_RET_NODEV: + return -ENODEV; + case USB_RET_STALL: + return -EPIPE; + case USB_RET_BABBLE: + return -EOVERFLOW; + case USB_RET_IOERROR: + return -EPROTO; + } + + return -ESHUTDOWN; +} + +static void usbback_packet_complete(struct usbback_req *usbback_req) +{ + USBPacket *packet = &usbback_req->packet; + int32_t status; + + QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); + + status = usbback_xlat_status(packet->status); + usbback_do_response(usbback_req, status, packet->actual_length, 0); +} + +static void usbback_set_address(struct usbback_info *usbif, + struct usbback_stub *stub, + unsigned int cur_addr, unsigned int new_addr) +{ + if (cur_addr) { + usbif->addr_table[cur_addr] = NULL; + } + if (new_addr) { + usbif->addr_table[new_addr] = stub; + } +} + +static void usbback_cancel_req(struct usbback_req *usbback_req) +{ + if (usb_packet_is_inflight(&usbback_req->packet)) { + usb_cancel_packet(&usbback_req->packet); + QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); + usbback_req->cancelled = true; + usbback_do_response_ret(usbback_req, -EPROTO); + } +} + +static void usbback_process_unlink_req(struct usbback_req *usbback_req) +{ + struct usbback_info *usbif; + struct usbback_req *unlink_req; + unsigned int id, devnum; + int ret; + + usbif = usbback_req->usbif; + ret = 0; + id = usbback_req->req.u.unlink.unlink_id; + TR_REQ(&usbif->xendev, "unlink id %d\n", id); + devnum = usbif_pipedevice(usbback_req->req.pipe); + if (unlikely(devnum == 0)) { + usbback_req->stub = usbif->ports + + usbif_pipeportnum(usbback_req->req.pipe) - 1; + if (unlikely(!usbback_req->stub)) { + ret = -ENODEV; + goto fail_response; + } + } else { + if (unlikely(!usbif->addr_table[devnum])) { + ret = -ENODEV; + goto fail_response; + } + usbback_req->stub = usbif->addr_table[devnum]; + } + + QTAILQ_FOREACH(unlink_req, &usbback_req->stub->submit_q, q) { + if (unlink_req->req.id == id) { + usbback_cancel_req(unlink_req); + break; + } + } + +fail_response: + usbback_do_response_ret(usbback_req, ret); +} + +/* + * Checks whether a request can be handled at once or should be forwarded + * to the usb framework. + * Return value is: + * 0 in case of usb framework is needed + * 1 in case of local handling (no error) + * The request response has been queued already if return value not 0. + */ +static int usbback_check_and_submit(struct usbback_req *usbback_req) +{ + struct usbback_info *usbif; + unsigned int devnum; + struct usbback_stub *stub; + struct usbif_ctrlrequest *ctrl; + int ret; + uint16_t wValue; + + usbif = usbback_req->usbif; + stub = NULL; + devnum = usbif_pipedevice(usbback_req->req.pipe); + ctrl = (struct usbif_ctrlrequest *)usbback_req->req.u.ctrl; + wValue = le16_to_cpu(ctrl->wValue); + + /* + * When the device is first connected or resetted, USB device has no + * address. In this initial state, following requests are sent to device + * address (#0), + * + * 1. GET_DESCRIPTOR (with Descriptor Type is "DEVICE") is sent, + * and OS knows what device is connected to. + * + * 2. SET_ADDRESS is sent, and then device has its address. + * + * In the next step, SET_CONFIGURATION is sent to addressed device, and + * then the device is finally ready to use. + */ + if (unlikely(devnum == 0)) { + stub = usbif->ports + usbif_pipeportnum(usbback_req->req.pipe) - 1; + if (!stub->dev || !stub->attached) { + ret = -ENODEV; + goto do_response; + } + + switch (ctrl->bRequest) { + case USB_REQ_GET_DESCRIPTOR: + /* + * GET_DESCRIPTOR request to device #0. + * through normal transfer. + */ + TR_REQ(&usbif->xendev, "devnum 0 GET_DESCRIPTOR\n"); + usbback_req->stub = stub; + return 0; + case USB_REQ_SET_ADDRESS: + /* + * SET_ADDRESS request to device #0. + * add attached device to addr_table. + */ + TR_REQ(&usbif->xendev, "devnum 0 SET_ADDRESS\n"); + usbback_set_address(usbif, stub, 0, wValue); + ret = 0; + break; + default: + ret = -EINVAL; + break; + } + goto do_response; + } + + if (unlikely(!usbif->addr_table[devnum])) { + ret = -ENODEV; + goto do_response; + } + usbback_req->stub = usbif->addr_table[devnum]; + + /* + * Check special request + */ + if (ctrl->bRequest != USB_REQ_SET_ADDRESS) { + return 0; + } + + /* + * SET_ADDRESS request to addressed device. + * change addr or remove from addr_table. + */ + usbback_set_address(usbif, usbback_req->stub, devnum, wValue); + ret = 0; + +do_response: + usbback_do_response_ret(usbback_req, ret); + return 1; +} + +static void usbback_dispatch(struct usbback_req *usbback_req) +{ + int ret; + unsigned int devnum; + struct usbback_info *usbif; + + usbif = usbback_req->usbif; + + TR_REQ(&usbif->xendev, "start req_id %d pipe %08x\n", usbback_req->req.id, + usbback_req->req.pipe); + + /* unlink request */ + if (unlikely(usbif_pipeunlink(usbback_req->req.pipe))) { + usbback_process_unlink_req(usbback_req); + return; + } + + if (usbif_pipectrl(usbback_req->req.pipe)) { + if (usbback_check_and_submit(usbback_req)) { + return; + } + } else { + devnum = usbif_pipedevice(usbback_req->req.pipe); + usbback_req->stub = usbif->addr_table[devnum]; + + if (!usbback_req->stub || !usbback_req->stub->attached) { + ret = -ENODEV; + goto fail_response; + } + } + + QTAILQ_INSERT_TAIL(&usbback_req->stub->submit_q, usbback_req, q); + + usbback_req->nr_buffer_segs = usbback_req->req.nr_buffer_segs; + usbback_req->nr_extra_segs = usbif_pipeisoc(usbback_req->req.pipe) ? + usbback_req->req.u.isoc.nr_frame_desc_segs : 0; + + ret = usbback_init_packet(usbback_req); + if (ret) { + xen_pv_printf(&usbif->xendev, 0, "invalid request\n"); + ret = -ESHUTDOWN; + goto fail_free_urb; + } + + ret = usbback_gnttab_map(usbback_req); + if (ret) { + xen_pv_printf(&usbif->xendev, 0, "invalid buffer, ret=%d\n", ret); + ret = -ESHUTDOWN; + goto fail_free_urb; + } + + usb_handle_packet(usbback_req->stub->dev, &usbback_req->packet); + if (usbback_req->packet.status != USB_RET_ASYNC) { + usbback_packet_complete(usbback_req); + } + return; + +fail_free_urb: + QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); + +fail_response: + usbback_do_response_ret(usbback_req, ret); +} + +static void usbback_hotplug_notify(struct usbback_info *usbif) +{ + struct usbif_conn_back_ring *ring = &usbif->conn_ring; + struct usbif_conn_request req; + struct usbif_conn_response *res; + struct usbback_hotplug *usb_hp; + unsigned int notify; + + if (!usbif->conn_sring) { + return; + } + + /* Check for full ring. */ + if ((RING_SIZE(ring) - ring->rsp_prod_pvt - ring->req_cons) == 0) { + xen_pv_send_notify(&usbif->xendev); + return; + } + + usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q); + QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q); + + RING_COPY_REQUEST(ring, ring->req_cons, &req); + ring->req_cons++; + ring->sring->req_event = ring->req_cons + 1; + + res = RING_GET_RESPONSE(ring, ring->rsp_prod_pvt); + res->id = req.id; + res->portnum = usb_hp->port; + res->speed = usbif->ports[usb_hp->port - 1].speed; + ring->rsp_prod_pvt++; + RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(ring, notify); + + if (notify) { + xen_pv_send_notify(&usbif->xendev); + } + + TR_BUS(&usbif->xendev, "hotplug port %d speed %d\n", usb_hp->port, + res->speed); + + g_free(usb_hp); + + if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { + qemu_bh_schedule(usbif->bh); + } +} + +static void usbback_bh(void *opaque) +{ + struct usbback_info *usbif; + struct usbif_urb_back_ring *urb_ring; + struct usbback_req *usbback_req; + RING_IDX rc, rp; + unsigned int more_to_do; + + usbif = opaque; + if (usbif->ring_error) { + return; + } + + if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { + usbback_hotplug_notify(usbif); + } + + urb_ring = &usbif->urb_ring; + rc = urb_ring->req_cons; + rp = urb_ring->sring->req_prod; + xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ + + if (RING_REQUEST_PROD_OVERFLOW(urb_ring, rp)) { + rc = urb_ring->rsp_prod_pvt; + xen_pv_printf(&usbif->xendev, 0, "domU provided bogus ring requests " + "(%#x - %#x = %u). Halting ring processing.\n", + rp, rc, rp - rc); + usbif->ring_error = true; + return; + } + + while (rc != rp) { + if (RING_REQUEST_CONS_OVERFLOW(urb_ring, rc)) { + break; + } + usbback_req = usbback_get_req(usbif); + + RING_COPY_REQUEST(urb_ring, rc, &usbback_req->req); + usbback_req->usbif = usbif; + + usbback_dispatch(usbback_req); + + urb_ring->req_cons = ++rc; + } + + RING_FINAL_CHECK_FOR_REQUESTS(urb_ring, more_to_do); + if (more_to_do) { + qemu_bh_schedule(usbif->bh); + } +} + +static void usbback_hotplug_enq(struct usbback_info *usbif, unsigned port) +{ + struct usbback_hotplug *usb_hp; + + usb_hp = g_new0(struct usbback_hotplug, 1); + usb_hp->port = port; + QSIMPLEQ_INSERT_TAIL(&usbif->hotplug_q, usb_hp, q); + usbback_hotplug_notify(usbif); +} + +static void usbback_portid_drain(struct usbback_info *usbif, unsigned port) +{ + struct usbback_req *req, *tmp; + bool sched = false; + + QTAILQ_FOREACH_SAFE(req, &usbif->ports[port - 1].submit_q, q, tmp) { + usbback_cancel_req(req); + sched = true; + } + + if (sched) { + qemu_bh_schedule(usbif->bh); + } +} + +static void usbback_portid_detach(struct usbback_info *usbif, unsigned port) +{ + if (!usbif->ports[port - 1].attached) { + return; + } + + usbif->ports[port - 1].speed = USBIF_SPEED_NONE; + usbif->ports[port - 1].attached = false; + usbback_portid_drain(usbif, port); + usbback_hotplug_enq(usbif, port); +} + +static void usbback_portid_remove(struct usbback_info *usbif, unsigned port) +{ + if (!usbif->ports[port - 1].dev) { + return; + } + + object_unparent(OBJECT(usbif->ports[port - 1].dev)); + usbif->ports[port - 1].dev = NULL; + usbback_portid_detach(usbif, port); + + TR_BUS(&usbif->xendev, "port %d removed\n", port); +} + +static void usbback_portid_add(struct usbback_info *usbif, unsigned port, + char *busid) +{ + unsigned speed; + char *portname; + Error *local_err = NULL; + QDict *qdict; + QemuOpts *opts; + char *tmp; + + if (usbif->ports[port - 1].dev) { + return; + } + + portname = strchr(busid, '-'); + if (!portname) { + xen_pv_printf(&usbif->xendev, 0, "device %s illegal specification\n", + busid); + return; + } + portname++; + + qdict = qdict_new(); + qdict_put_str(qdict, "driver", "usb-host"); + tmp = g_strdup_printf("%s.0", usbif->xendev.qdev.id); + qdict_put_str(qdict, "bus", tmp); + g_free(tmp); + tmp = g_strdup_printf("%s-%u", usbif->xendev.qdev.id, port); + qdict_put_str(qdict, "id", tmp); + g_free(tmp); + qdict_put_int(qdict, "port", port); + qdict_put_int(qdict, "hostbus", atoi(busid)); + qdict_put_str(qdict, "hostport", portname); + opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, + &error_abort); + usbif->ports[port - 1].dev = USB_DEVICE(qdev_device_add(opts, &local_err)); + if (!usbif->ports[port - 1].dev) { + qobject_unref(qdict); + xen_pv_printf(&usbif->xendev, 0, + "device %s could not be opened: %s\n", + busid, error_get_pretty(local_err)); + error_free(local_err); + return; + } + qobject_unref(qdict); + speed = usbif->ports[port - 1].dev->speed; + switch (speed) { + case USB_SPEED_LOW: + speed = USBIF_SPEED_LOW; + break; + case USB_SPEED_FULL: + speed = USBIF_SPEED_FULL; + break; + case USB_SPEED_HIGH: + speed = (usbif->usb_ver < USB_VER_USB20) ? + USBIF_SPEED_NONE : USBIF_SPEED_HIGH; + break; + default: + speed = USBIF_SPEED_NONE; + break; + } + if (speed == USBIF_SPEED_NONE) { + xen_pv_printf(&usbif->xendev, 0, "device %s wrong speed\n", busid); + object_unparent(OBJECT(usbif->ports[port - 1].dev)); + usbif->ports[port - 1].dev = NULL; + return; + } + usb_device_reset(usbif->ports[port - 1].dev); + usbif->ports[port - 1].speed = speed; + usbif->ports[port - 1].attached = true; + QTAILQ_INIT(&usbif->ports[port - 1].submit_q); + usbback_hotplug_enq(usbif, port); + + TR_BUS(&usbif->xendev, "port %d attached\n", port); +} + +static void usbback_process_port(struct usbback_info *usbif, unsigned port) +{ + char node[8]; + char *busid; + + snprintf(node, sizeof(node), "port/%d", port); + busid = xenstore_read_be_str(&usbif->xendev, node); + if (busid == NULL) { + xen_pv_printf(&usbif->xendev, 0, "xenstore_read %s failed\n", node); + return; + } + + /* Remove portid, if the port is not connected. */ + if (strlen(busid) == 0) { + usbback_portid_remove(usbif, port); + } else { + usbback_portid_add(usbif, port, busid); + } + + g_free(busid); +} + +static void usbback_disconnect(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + unsigned int i; + + TR_BUS(xendev, "start\n"); + + usbif = container_of(xendev, struct usbback_info, xendev); + + xen_pv_unbind_evtchn(xendev); + + if (usbif->urb_sring) { + xen_be_unmap_grant_ref(xendev, usbif->urb_sring); + usbif->urb_sring = NULL; + } + if (usbif->conn_sring) { + xen_be_unmap_grant_ref(xendev, usbif->conn_sring); + usbif->conn_sring = NULL; + } + + for (i = 0; i < usbif->num_ports; i++) { + if (usbif->ports[i].dev) { + usbback_portid_drain(usbif, i + 1); + } + } + + TR_BUS(xendev, "finished\n"); +} + +static int usbback_connect(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + struct usbif_urb_sring *urb_sring; + struct usbif_conn_sring *conn_sring; + int urb_ring_ref; + int conn_ring_ref; + unsigned int i, max_grants; + + TR_BUS(xendev, "start\n"); + + /* max_grants: for each request and for the rings (request and connect). */ + max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2; + xen_be_set_max_grant_refs(xendev, max_grants); + + usbif = container_of(xendev, struct usbback_info, xendev); + + if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) { + xen_pv_printf(xendev, 0, "error reading urb-ring-ref\n"); + return -1; + } + if (xenstore_read_fe_int(xendev, "conn-ring-ref", &conn_ring_ref)) { + xen_pv_printf(xendev, 0, "error reading conn-ring-ref\n"); + return -1; + } + if (xenstore_read_fe_int(xendev, "event-channel", &xendev->remote_port)) { + xen_pv_printf(xendev, 0, "error reading event-channel\n"); + return -1; + } + + usbif->urb_sring = xen_be_map_grant_ref(xendev, urb_ring_ref, + PROT_READ | PROT_WRITE); + usbif->conn_sring = xen_be_map_grant_ref(xendev, conn_ring_ref, + PROT_READ | PROT_WRITE); + if (!usbif->urb_sring || !usbif->conn_sring) { + xen_pv_printf(xendev, 0, "error mapping rings\n"); + usbback_disconnect(xendev); + return -1; + } + + urb_sring = usbif->urb_sring; + conn_sring = usbif->conn_sring; + BACK_RING_INIT(&usbif->urb_ring, urb_sring, XC_PAGE_SIZE); + BACK_RING_INIT(&usbif->conn_ring, conn_sring, XC_PAGE_SIZE); + + xen_be_bind_evtchn(xendev); + + xen_pv_printf(xendev, 1, "urb-ring-ref %d, conn-ring-ref %d, " + "remote port %d, local port %d\n", urb_ring_ref, + conn_ring_ref, xendev->remote_port, xendev->local_port); + + for (i = 1; i <= usbif->num_ports; i++) { + if (usbif->ports[i - 1].dev) { + usbback_hotplug_enq(usbif, i); + } + } + + return 0; +} + +static void usbback_backend_changed(struct XenLegacyDevice *xendev, + const char *node) +{ + struct usbback_info *usbif; + unsigned int i; + + TR_BUS(xendev, "path %s\n", node); + + usbif = container_of(xendev, struct usbback_info, xendev); + for (i = 1; i <= usbif->num_ports; i++) { + usbback_process_port(usbif, i); + } +} + +static int usbback_init(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + + TR_BUS(xendev, "start\n"); + + usbif = container_of(xendev, struct usbback_info, xendev); + + if (xenstore_read_be_int(xendev, "num-ports", &usbif->num_ports) || + usbif->num_ports < 1 || usbif->num_ports > USBBACK_MAXPORTS) { + xen_pv_printf(xendev, 0, "num-ports not readable or out of bounds\n"); + return -1; + } + if (xenstore_read_be_int(xendev, "usb-ver", &usbif->usb_ver) || + (usbif->usb_ver != USB_VER_USB11 && usbif->usb_ver != USB_VER_USB20)) { + xen_pv_printf(xendev, 0, "usb-ver not readable or out of bounds\n"); + return -1; + } + + usbback_backend_changed(xendev, "port"); + + TR_BUS(xendev, "finished\n"); + + return 0; +} + +static void xen_bus_attach(USBPort *port) +{ + struct usbback_info *usbif; + + usbif = port->opaque; + TR_BUS(&usbif->xendev, "\n"); + usbif->ports[port->index].attached = true; + usbback_hotplug_enq(usbif, port->index + 1); +} + +static void xen_bus_detach(USBPort *port) +{ + struct usbback_info *usbif; + + usbif = port->opaque; + TR_BUS(&usbif->xendev, "\n"); + usbback_portid_detach(usbif, port->index + 1); +} + +static void xen_bus_child_detach(USBPort *port, USBDevice *child) +{ + struct usbback_info *usbif; + + usbif = port->opaque; + TR_BUS(&usbif->xendev, "\n"); +} + +static void xen_bus_complete(USBPort *port, USBPacket *packet) +{ + struct usbback_req *usbback_req; + struct usbback_info *usbif; + + usbback_req = container_of(packet, struct usbback_req, packet); + if (usbback_req->cancelled) { + g_free(usbback_req); + return; + } + + usbif = usbback_req->usbif; + TR_REQ(&usbif->xendev, "\n"); + usbback_packet_complete(usbback_req); +} + +static USBPortOps xen_usb_port_ops = { + .attach = xen_bus_attach, + .detach = xen_bus_detach, + .child_detach = xen_bus_child_detach, + .complete = xen_bus_complete, +}; + +static USBBusOps xen_usb_bus_ops = { +}; + +static void usbback_alloc(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + USBPort *p; + unsigned int i; + + usbif = container_of(xendev, struct usbback_info, xendev); + + usb_bus_new(&usbif->bus, sizeof(usbif->bus), &xen_usb_bus_ops, + DEVICE(&xendev->qdev)); + for (i = 0; i < USBBACK_MAXPORTS; i++) { + p = &(usbif->ports[i].port); + usb_register_port(&usbif->bus, p, usbif, i, &xen_usb_port_ops, + USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL | + USB_SPEED_MASK_HIGH); + } + + QTAILQ_INIT(&usbif->req_free_q); + QSIMPLEQ_INIT(&usbif->hotplug_q); + usbif->bh = qemu_bh_new(usbback_bh, usbif); +} + +static int usbback_free(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + struct usbback_req *usbback_req; + struct usbback_hotplug *usb_hp; + unsigned int i; + + TR_BUS(xendev, "start\n"); + + usbback_disconnect(xendev); + usbif = container_of(xendev, struct usbback_info, xendev); + for (i = 1; i <= usbif->num_ports; i++) { + usbback_portid_remove(usbif, i); + } + + while (!QTAILQ_EMPTY(&usbif->req_free_q)) { + usbback_req = QTAILQ_FIRST(&usbif->req_free_q); + QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q); + g_free(usbback_req); + } + while (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { + usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q); + QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q); + g_free(usb_hp); + } + + qemu_bh_delete(usbif->bh); + + for (i = 0; i < USBBACK_MAXPORTS; i++) { + usb_unregister_port(&usbif->bus, &(usbif->ports[i].port)); + } + + usb_bus_release(&usbif->bus); + + TR_BUS(xendev, "finished\n"); + + return 0; +} + +static void usbback_event(struct XenLegacyDevice *xendev) +{ + struct usbback_info *usbif; + + usbif = container_of(xendev, struct usbback_info, xendev); + qemu_bh_schedule(usbif->bh); +} + +struct XenDevOps xen_usb_ops = { + .size = sizeof(struct usbback_info), + .flags = DEVOPS_FLAG_NEED_GNTDEV, + .init = usbback_init, + .alloc = usbback_alloc, + .free = usbback_free, + .backend_changed = usbback_backend_changed, + .initialise = usbback_connect, + .disconnect = usbback_disconnect, + .event = usbback_event, +}; + +#else /* USBIF_SHORT_NOT_OK */ + +static int usbback_not_supported(void) +{ + return -EINVAL; +} + +struct XenDevOps xen_usb_ops = { + .backend_register = usbback_not_supported, +}; + +#endif |