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diff --git a/sys/amd64/conf/NOTES b/sys/amd64/conf/NOTES
--- a/sys/amd64/conf/NOTES
+++ b/sys/amd64/conf/NOTES
@@ -501,6 +501,7 @@
# Microsoft Hyper-V enhancement support
device hyperv # HyperV drivers
+device hvhid # HyperV HID device
# Xen HVM Guest Optimizations
options XENHVM # Xen HVM kernel infrastructure
diff --git a/sys/conf/files.x86 b/sys/conf/files.x86
--- a/sys/conf/files.x86
+++ b/sys/conf/files.x86
@@ -115,6 +115,7 @@
dev/hwpmc/hwpmc_tsc.c optional hwpmc
dev/hwpmc/hwpmc_x86.c optional hwpmc
dev/hyperv/hvsock/hv_sock.c optional hyperv
+dev/hyperv/input/hv_hid.c optional hyperv hvhid
dev/hyperv/input/hv_kbd.c optional hyperv
dev/hyperv/input/hv_kbdc.c optional hyperv
dev/hyperv/pcib/vmbus_pcib.c optional hyperv pci
diff --git a/sys/dev/hid/hidbus.c b/sys/dev/hid/hidbus.c
--- a/sys/dev/hid/hidbus.c
+++ b/sys/dev/hid/hidbus.c
@@ -924,5 +924,6 @@
MODULE_DEPEND(hidbus, hid, 1, 1, 1);
MODULE_VERSION(hidbus, 1);
+DRIVER_MODULE(hidbus, hvhid, hidbus_driver, 0, 0);
DRIVER_MODULE(hidbus, iichid, hidbus_driver, 0, 0);
DRIVER_MODULE(hidbus, usbhid, hidbus_driver, 0, 0);
diff --git a/sys/dev/hyperv/input/hv_hid.c b/sys/dev/hyperv/input/hv_hid.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/hyperv/input/hv_hid.c
@@ -0,0 +1,564 @@
+/*-
+ * Copyright (c) 2017 Microsoft Corp.
+ * Copyright (c) 2023 Yuri <yuri@aetern.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cdefs.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+
+#include <dev/evdev/input.h>
+
+#include <dev/hid/hid.h>
+
+#include <dev/hyperv/include/hyperv.h>
+#include <dev/hyperv/include/vmbus_xact.h>
+#include <dev/hyperv/utilities/hv_utilreg.h>
+#include <dev/hyperv/utilities/vmbus_icreg.h>
+#include <dev/hyperv/utilities/vmbus_icvar.h>
+
+#include "hid_if.h"
+#include "vmbus_if.h"
+
+#define HV_HID_VER_MAJOR 2
+#define HV_HID_VER_MINOR 0
+#define HV_HID_VER (HV_HID_VER_MINOR | (HV_HID_VER_MAJOR) << 16)
+
+#define HV_BUFSIZ (4 * PAGE_SIZE)
+#define HV_HID_RINGBUFF_SEND_SZ (10 * PAGE_SIZE)
+#define HV_HID_RINGBUFF_RECV_SZ (10 * PAGE_SIZE)
+
+typedef struct {
+ device_t dev;
+ struct mtx mtx;
+ /* vmbus */
+ struct vmbus_channel *hs_chan;
+ struct vmbus_xact_ctx *hs_xact_ctx;
+ uint8_t *buf;
+ int buflen;
+ /* hid */
+ struct hid_device_info hdi;
+ hid_intr_t *intr;
+ bool intr_on;
+ void *intr_ctx;
+ uint8_t *rdesc;
+} hv_hid_sc;
+
+typedef enum {
+ SH_PROTO_REQ,
+ SH_PROTO_RESP,
+ SH_DEVINFO,
+ SH_DEVINFO_ACK,
+ SH_INPUT_REPORT,
+} sh_msg_type;
+
+typedef struct {
+ sh_msg_type type;
+ uint32_t size;
+} __packed sh_msg_hdr;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ char data[];
+} __packed sh_msg;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ uint32_t ver;
+} __packed sh_proto_req;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ uint32_t ver;
+ uint32_t app;
+} __packed sh_proto_resp;
+
+typedef struct {
+ u_int size;
+ u_short vendor;
+ u_short product;
+ u_short version;
+ u_short reserved[11];
+} __packed sh_devinfo;
+
+/* Copied from linux/hid.h */
+typedef struct {
+ uint8_t bDescriptorType;
+ uint16_t wDescriptorLength;
+} __packed sh_hcdesc;
+
+typedef struct {
+ uint8_t bLength;
+ uint8_t bDescriptorType;
+ uint16_t bcdHID;
+ uint8_t bCountryCode;
+ uint8_t bNumDescriptors;
+ sh_hcdesc hcdesc[1];
+} __packed sh_hdesc;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ sh_devinfo devinfo;
+ sh_hdesc hdesc;
+} __packed sh_devinfo_resp;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ uint8_t rsvd;
+} __packed sh_devinfo_ack;
+
+typedef struct {
+ sh_msg_hdr hdr;
+ char buffer[];
+} __packed sh_input_report;
+
+typedef enum {
+ HV_HID_MSG_INVALID,
+ HV_HID_MSG_DATA,
+} hv_hid_msg_type;
+
+typedef struct {
+ hv_hid_msg_type type;
+ uint32_t size;
+ char data[];
+} hv_hid_pmsg;
+
+typedef struct {
+ hv_hid_msg_type type;
+ uint32_t size;
+ union {
+ sh_msg msg;
+ sh_proto_req req;
+ sh_proto_resp resp;
+ sh_devinfo_resp dresp;
+ sh_devinfo_ack ack;
+ sh_input_report irep;
+ };
+} hv_hid_msg;
+
+#define HV_HID_REQ_SZ (sizeof(hv_hid_pmsg) + sizeof(sh_proto_req))
+#define HV_HID_RESP_SZ (sizeof(hv_hid_pmsg) + sizeof(sh_proto_resp))
+#define HV_HID_ACK_SZ (sizeof(hv_hid_pmsg) + sizeof(sh_devinfo_ack))
+
+/* Somewhat arbitrary, enough to get the devinfo response */
+#define HV_HID_REQ_MAX 256
+#define HV_HID_RESP_MAX 256
+
+static const struct vmbus_ic_desc vmbus_hid_descs[] = {
+ {
+ .ic_guid = { .hv_guid = {
+ 0x9e, 0xb6, 0xa8, 0xcf, 0x4a, 0x5b, 0xc0, 0x4c,
+ 0xb9, 0x8b, 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a} },
+ .ic_desc = "Hyper-V HID device"
+ },
+ VMBUS_IC_DESC_END
+};
+
+/* TODO: add GUID support to devmatch(8) to export vmbus_hid_descs directly */
+const struct {
+ char *guid;
+} vmbus_hid_descs_pnp[] = {{ "cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a" }};
+
+static int hv_hid_attach(device_t dev);
+static int hv_hid_detach(device_t dev);
+
+static int
+hv_hid_connect_vsp(hv_hid_sc *sc)
+{
+ struct vmbus_xact *xact;
+ hv_hid_msg *req;
+ const hv_hid_msg *resp;
+ size_t resplen;
+ int ret;
+
+ xact = vmbus_xact_get(sc->hs_xact_ctx, HV_HID_REQ_SZ);
+ if (xact == NULL) {
+ device_printf(sc->dev, "no xact for init");
+ return (ENODEV);
+ }
+ req = vmbus_xact_req_data(xact);
+ req->type = HV_HID_MSG_DATA;
+ req->size = sizeof(sh_proto_req);
+ req->req.hdr.type = SH_PROTO_REQ;
+ req->req.hdr.size = sizeof(u_int);
+ req->req.ver = HV_HID_VER;
+
+ vmbus_xact_activate(xact);
+ ret = vmbus_chan_send(sc->hs_chan,
+ VMBUS_CHANPKT_TYPE_INBAND,
+ VMBUS_CHANPKT_FLAG_RC,
+ req, HV_HID_REQ_SZ, (uint64_t)(uintptr_t)xact);
+ if (ret != 0) {
+ device_printf(sc->dev, "failed to send proto req\n");
+ vmbus_xact_deactivate(xact);
+ return (ret);
+ }
+ resp = vmbus_chan_xact_wait(sc->hs_chan, xact, &resplen, true);
+ if (resplen != HV_HID_RESP_SZ || !resp->resp.app) {
+ device_printf(sc->dev, "proto req failed\n");
+ ret = ENODEV;
+ }
+
+ vmbus_xact_put(xact);
+ return (ret);
+}
+
+static void
+hv_hid_receive(hv_hid_sc *sc, struct vmbus_chanpkt_hdr *pkt)
+{
+ const hv_hid_msg *msg;
+ sh_msg_type msg_type;
+ uint32_t msg_len;
+ void *rdesc;
+
+ msg = VMBUS_CHANPKT_CONST_DATA(pkt);
+ msg_len = VMBUS_CHANPKT_DATALEN(pkt);
+
+ if (msg->type != HV_HID_MSG_DATA)
+ return;
+
+ if (msg_len <= sizeof(hv_hid_pmsg)) {
+ device_printf(sc->dev, "invalid packet length\n");
+ return;
+ }
+ msg_type = msg->msg.hdr.type;
+ switch (msg_type) {
+ case SH_PROTO_RESP: {
+ struct vmbus_xact_ctx *xact_ctx;
+
+ xact_ctx = sc->hs_xact_ctx;
+ if (xact_ctx != NULL) {
+ vmbus_xact_ctx_wakeup(xact_ctx,
+ VMBUS_CHANPKT_CONST_DATA(pkt),
+ VMBUS_CHANPKT_DATALEN(pkt));
+ }
+ break;
+ }
+ case SH_DEVINFO: {
+ struct vmbus_xact *xact;
+ struct hid_device_info *hdi;
+ hv_hid_msg ack;
+ const sh_devinfo *devinfo;
+ const sh_hdesc *hdesc;
+
+ /* Send ack */
+ ack.type = HV_HID_MSG_DATA;
+ ack.size = sizeof(sh_devinfo_ack);
+ ack.ack.hdr.type = SH_DEVINFO_ACK;
+ ack.ack.hdr.size = 1;
+ ack.ack.rsvd = 0;
+
+ xact = vmbus_xact_get(sc->hs_xact_ctx, HV_HID_ACK_SZ);
+ if (xact == NULL)
+ break;
+ vmbus_xact_activate(xact);
+ (void) vmbus_chan_send(sc->hs_chan, VMBUS_CHANPKT_TYPE_INBAND,
+ 0, &ack, HV_HID_ACK_SZ, (uint64_t)(uintptr_t)xact);
+ vmbus_xact_deactivate(xact);
+ vmbus_xact_put(xact);
+
+ /* Check for resume from hibernation */
+ if (sc->rdesc != NULL)
+ break;
+
+ /* Parse devinfo response */
+ devinfo = &msg->dresp.devinfo;
+ hdesc = &msg->dresp.hdesc;
+ if (hdesc->bLength == 0)
+ break;
+ hdi = &sc->hdi;
+ memset(hdi, 0, sizeof(*hdi));
+ hdi->rdescsize = le16toh(hdesc->hcdesc[0].wDescriptorLength);
+ if (hdi->rdescsize == 0)
+ break;
+ strlcpy(hdi->name, "Hyper-V", sizeof(hdi->name));
+ hdi->idBus = BUS_VIRTUAL;
+ hdi->idVendor = le16toh(devinfo->vendor);
+ hdi->idProduct = le16toh(devinfo->product);
+ hdi->idVersion = le16toh(devinfo->version);
+ /* Save rdesc copy */
+ rdesc = malloc(hdi->rdescsize, M_DEVBUF, M_WAITOK | M_ZERO);
+ memcpy(rdesc, (const uint8_t *)hdesc + hdesc->bLength,
+ hdi->rdescsize);
+ mtx_lock(&sc->mtx);
+ sc->rdesc = rdesc;
+ wakeup(sc);
+ mtx_unlock(&sc->mtx);
+ break;
+ }
+ case SH_INPUT_REPORT: {
+ mtx_lock(&sc->mtx);
+ if (sc->intr != NULL && sc->intr_on)
+ sc->intr(sc->intr_ctx,
+ __DECONST(void *, msg->irep.buffer),
+ msg->irep.hdr.size);
+ mtx_unlock(&sc->mtx);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static void
+hv_hid_read_channel(struct vmbus_channel *channel, void *ctx)
+{
+ hv_hid_sc *sc;
+ uint8_t *buf;
+ int buflen;
+ int ret;
+
+ sc = ctx;
+ buf = sc->buf;
+ buflen = sc->buflen;
+ for (;;) {
+ struct vmbus_chanpkt_hdr *pkt;
+ int rcvd;
+
+ pkt = (struct vmbus_chanpkt_hdr *)buf;
+ rcvd = buflen;
+ ret = vmbus_chan_recv_pkt(channel, pkt, &rcvd);
+ if (__predict_false(ret == ENOBUFS)) {
+ buflen = sc->buflen * 2;
+ while (buflen < rcvd)
+ buflen *= 2;
+ buf = malloc(buflen, M_DEVBUF, M_WAITOK | M_ZERO);
+ device_printf(sc->dev, "expand recvbuf %d -> %d\n",
+ sc->buflen, buflen);
+ free(sc->buf, M_DEVBUF);
+ sc->buf = buf;
+ sc->buflen = buflen;
+ continue;
+ } else if (__predict_false(ret == EAGAIN)) {
+ /* No more channel packets; done! */
+ break;
+ }
+ KASSERT(ret == 0, ("vmbus_chan_recv_pkt failed: %d", ret));
+
+ switch (pkt->cph_type) {
+ case VMBUS_CHANPKT_TYPE_COMP:
+ case VMBUS_CHANPKT_TYPE_RXBUF:
+ device_printf(sc->dev, "unhandled event: %d\n",
+ pkt->cph_type);
+ break;
+ case VMBUS_CHANPKT_TYPE_INBAND:
+ hv_hid_receive(sc, pkt);
+ break;
+ default:
+ device_printf(sc->dev, "unknown event: %d\n",
+ pkt->cph_type);
+ break;
+ }
+ }
+}
+
+static int
+hv_hid_probe(device_t dev)
+{
+ device_t bus;
+ const struct vmbus_ic_desc *d;
+
+ if (resource_disabled(device_get_name(dev), 0))
+ return (ENXIO);
+
+ bus = device_get_parent(dev);
+ for (d = vmbus_hid_descs; d->ic_desc != NULL; ++d) {
+ if (VMBUS_PROBE_GUID(bus, dev, &d->ic_guid) == 0) {
+ device_set_desc(dev, d->ic_desc);
+ return (BUS_PROBE_DEFAULT);
+ }
+ }
+
+ return (ENXIO);
+}
+
+static int
+hv_hid_attach(device_t dev)
+{
+ device_t child;
+ hv_hid_sc *sc;
+ int ret;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+ mtx_init(&sc->mtx, "hvhid lock", NULL, MTX_DEF);
+ sc->hs_chan = vmbus_get_channel(dev);
+ sc->hs_xact_ctx = vmbus_xact_ctx_create(bus_get_dma_tag(dev),
+ HV_HID_REQ_MAX, HV_HID_RESP_MAX, 0);
+ if (sc->hs_xact_ctx == NULL) {
+ ret = ENOMEM;
+ goto out;
+ }
+ sc->buflen = HV_BUFSIZ;
+ sc->buf = malloc(sc->buflen, M_DEVBUF, M_WAITOK | M_ZERO);
+ vmbus_chan_set_readbatch(sc->hs_chan, false);
+ ret = vmbus_chan_open(sc->hs_chan, HV_HID_RINGBUFF_SEND_SZ,
+ HV_HID_RINGBUFF_RECV_SZ, NULL, 0, hv_hid_read_channel, sc);
+ if (ret != 0)
+ goto out;
+ ret = hv_hid_connect_vsp(sc);
+ if (ret != 0)
+ goto out;
+
+ /* Wait until we have devinfo (or arbitrary timeout of 3s) */
+ mtx_lock(&sc->mtx);
+ if (sc->rdesc == NULL)
+ ret = mtx_sleep(sc, &sc->mtx, 0, "hvhid", hz * 3);
+ mtx_unlock(&sc->mtx);
+ if (ret != 0) {
+ ret = ENODEV;
+ goto out;
+ }
+ child = device_add_child(sc->dev, "hidbus", -1);
+ if (child == NULL) {
+ device_printf(sc->dev, "failed to add hidbus\n");
+ ret = ENOMEM;
+ goto out;
+ }
+ device_set_ivars(child, &sc->hdi);
+ ret = bus_generic_attach(dev);
+ if (ret != 0)
+ device_printf(sc->dev, "failed to attach hidbus\n");
+out:
+ if (ret != 0)
+ hv_hid_detach(dev);
+ return (ret);
+}
+
+static int
+hv_hid_detach(device_t dev)
+{
+ hv_hid_sc *sc;
+ int ret;
+
+ sc = device_get_softc(dev);
+ ret = device_delete_children(dev);
+ if (ret != 0)
+ return (ret);
+ if (sc->hs_xact_ctx != NULL)
+ vmbus_xact_ctx_destroy(sc->hs_xact_ctx);
+ vmbus_chan_close(vmbus_get_channel(dev));
+ free(sc->buf, M_DEVBUF);
+ free(sc->rdesc, M_DEVBUF);
+ mtx_destroy(&sc->mtx);
+
+ return (0);
+}
+
+static void
+hv_hid_intr_setup(device_t dev, hid_intr_t intr, void *ctx,
+ struct hid_rdesc_info *rdesc)
+{
+ hv_hid_sc *sc;
+
+ if (intr == NULL)
+ return;
+
+ sc = device_get_softc(dev);
+ sc->intr = intr;
+ sc->intr_on = false;
+ sc->intr_ctx = ctx;
+ rdesc->rdsize = rdesc->isize;
+}
+
+static void
+hv_hid_intr_unsetup(device_t dev)
+{
+ hv_hid_sc *sc;
+
+ sc = device_get_softc(dev);
+ sc->intr = NULL;
+ sc->intr_on = false;
+ sc->intr_ctx = NULL;
+}
+
+static int
+hv_hid_intr_start(device_t dev)
+{
+ hv_hid_sc *sc;
+
+ sc = device_get_softc(dev);
+ mtx_lock(&sc->mtx);
+ sc->intr_on = true;
+ mtx_unlock(&sc->mtx);
+ return (0);
+}
+
+static int
+hv_hid_intr_stop(device_t dev)
+{
+ hv_hid_sc *sc;
+
+ sc = device_get_softc(dev);
+ mtx_lock(&sc->mtx);
+ sc->intr_on = false;
+ mtx_unlock(&sc->mtx);
+ return (0);
+}
+
+static int
+hv_hid_get_rdesc(device_t dev, void *buf, hid_size_t len)
+{
+ hv_hid_sc *sc;
+
+ sc = device_get_softc(dev);
+ if (len < sc->hdi.rdescsize)
+ return (EMSGSIZE);
+ memcpy(buf, sc->rdesc, len);
+ return (0);
+}
+
+static device_method_t hv_hid_methods[] = {
+ DEVMETHOD(device_probe, hv_hid_probe),
+ DEVMETHOD(device_attach, hv_hid_attach),
+ DEVMETHOD(device_detach, hv_hid_detach),
+
+ DEVMETHOD(hid_intr_setup, hv_hid_intr_setup),
+ DEVMETHOD(hid_intr_unsetup, hv_hid_intr_unsetup),
+ DEVMETHOD(hid_intr_start, hv_hid_intr_start),
+ DEVMETHOD(hid_intr_stop, hv_hid_intr_stop),
+
+ DEVMETHOD(hid_get_rdesc, hv_hid_get_rdesc),
+ DEVMETHOD_END,
+};
+
+static driver_t hv_hid_driver = {
+ .name = "hvhid",
+ .methods = hv_hid_methods,
+ .size = sizeof(hv_hid_sc),
+};
+
+DRIVER_MODULE(hv_hid, vmbus, hv_hid_driver, NULL, NULL);
+MODULE_VERSION(hv_hid, 1);
+MODULE_DEPEND(hv_hid, hidbus, 1, 1, 1);
+MODULE_DEPEND(hv_hid, hms, 1, 1, 1);
+MODULE_DEPEND(hv_hid, vmbus, 1, 1, 1);
+MODULE_PNP_INFO("Z:classid", vmbus, hv_hid, vmbus_hid_descs_pnp,
+ nitems(vmbus_hid_descs_pnp));
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES
--- a/sys/i386/conf/NOTES
+++ b/sys/i386/conf/NOTES
@@ -703,6 +703,7 @@
options HYPERV
device hyperv # HyperV drivers
+device hvhid # HyperV HID device
#####################################################################
diff --git a/sys/modules/hyperv/Makefile b/sys/modules/hyperv/Makefile
--- a/sys/modules/hyperv/Makefile
+++ b/sys/modules/hyperv/Makefile
@@ -1,5 +1,5 @@
# $FreeBSD$
-SUBDIR = vmbus netvsc storvsc utilities hvsock
+SUBDIR = vmbus netvsc storvsc utilities hvsock hid
.include <bsd.subdir.mk>
diff --git a/sys/modules/hyperv/hid/Makefile b/sys/modules/hyperv/hid/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/hyperv/hid/Makefile
@@ -0,0 +1,12 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/dev/hyperv/input
+
+KMOD= hv_hid
+SRCS= hv_hid.c
+SRCS+= bus_if.h device_if.h hid_if.h vmbus_if.h
+
+CFLAGS+= -I${SRCTOP}/sys/dev/hyperv/include \
+ -I${SRCTOP}/sys/dev/hyperv/vmbus
+
+.include <bsd.kmod.mk>

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