/*- * Copyright (c) 2009-2012,2016 Microsoft Corp. * Copyright (c) 2012 NetApp Inc. * Copyright (c) 2012 Citrix Inc. * All rights reserved. * * 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. */ /* * VM Bus Driver Implementation */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "acpi_if.h" struct vmbus_msghc { struct hypercall_postmsg_in *mh_inprm; struct hypercall_postmsg_in mh_inprm_save; struct hyperv_dma mh_inprm_dma; struct vmbus_message *mh_resp; struct vmbus_message mh_resp0; }; struct vmbus_msghc_ctx { struct vmbus_msghc *mhc_free; struct mtx mhc_free_lock; uint32_t mhc_flags; struct vmbus_msghc *mhc_active; struct mtx mhc_active_lock; }; #define VMBUS_MSGHC_CTXF_DESTROY 0x0001 static int vmbus_init(struct vmbus_softc *); static int vmbus_connect(struct vmbus_softc *, uint32_t); static int vmbus_req_channels(struct vmbus_softc *sc); static void vmbus_disconnect(struct vmbus_softc *); static int vmbus_scan(struct vmbus_softc *); static void vmbus_scan_wait(struct vmbus_softc *); static void vmbus_scan_newdev(struct vmbus_softc *); static int vmbus_sysctl_version(SYSCTL_HANDLER_ARGS); static struct vmbus_msghc_ctx *vmbus_msghc_ctx_create(bus_dma_tag_t); static void vmbus_msghc_ctx_destroy( struct vmbus_msghc_ctx *); static void vmbus_msghc_ctx_free(struct vmbus_msghc_ctx *); static struct vmbus_msghc *vmbus_msghc_alloc(bus_dma_tag_t); static void vmbus_msghc_free(struct vmbus_msghc *); static struct vmbus_msghc *vmbus_msghc_get1(struct vmbus_msghc_ctx *, uint32_t); struct vmbus_softc *vmbus_sc; extern inthand_t IDTVEC(vmbus_isr); static const uint32_t vmbus_version[] = { HV_VMBUS_VERSION_WIN8_1, HV_VMBUS_VERSION_WIN8, HV_VMBUS_VERSION_WIN7, HV_VMBUS_VERSION_WS2008 }; static struct vmbus_msghc * vmbus_msghc_alloc(bus_dma_tag_t parent_dtag) { struct vmbus_msghc *mh; mh = malloc(sizeof(*mh), M_DEVBUF, M_WAITOK | M_ZERO); mh->mh_inprm = hyperv_dmamem_alloc(parent_dtag, HYPERCALL_POSTMSGIN_ALIGN, 0, HYPERCALL_POSTMSGIN_SIZE, &mh->mh_inprm_dma, BUS_DMA_WAITOK); if (mh->mh_inprm == NULL) { free(mh, M_DEVBUF); return NULL; } return mh; } static void vmbus_msghc_free(struct vmbus_msghc *mh) { hyperv_dmamem_free(&mh->mh_inprm_dma, mh->mh_inprm); free(mh, M_DEVBUF); } static void vmbus_msghc_ctx_free(struct vmbus_msghc_ctx *mhc) { KASSERT(mhc->mhc_active == NULL, ("still have active msg hypercall")); KASSERT(mhc->mhc_free == NULL, ("still have hypercall msg")); mtx_destroy(&mhc->mhc_free_lock); mtx_destroy(&mhc->mhc_active_lock); free(mhc, M_DEVBUF); } static struct vmbus_msghc_ctx * vmbus_msghc_ctx_create(bus_dma_tag_t parent_dtag) { struct vmbus_msghc_ctx *mhc; mhc = malloc(sizeof(*mhc), M_DEVBUF, M_WAITOK | M_ZERO); mtx_init(&mhc->mhc_free_lock, "vmbus msghc free", NULL, MTX_DEF); mtx_init(&mhc->mhc_active_lock, "vmbus msghc act", NULL, MTX_DEF); mhc->mhc_free = vmbus_msghc_alloc(parent_dtag); if (mhc->mhc_free == NULL) { vmbus_msghc_ctx_free(mhc); return NULL; } return mhc; } static struct vmbus_msghc * vmbus_msghc_get1(struct vmbus_msghc_ctx *mhc, uint32_t dtor_flag) { struct vmbus_msghc *mh; mtx_lock(&mhc->mhc_free_lock); while ((mhc->mhc_flags & dtor_flag) == 0 && mhc->mhc_free == NULL) { mtx_sleep(&mhc->mhc_free, &mhc->mhc_free_lock, 0, "gmsghc", 0); } if (mhc->mhc_flags & dtor_flag) { /* Being destroyed */ mh = NULL; } else { mh = mhc->mhc_free; KASSERT(mh != NULL, ("no free hypercall msg")); KASSERT(mh->mh_resp == NULL, ("hypercall msg has pending response")); mhc->mhc_free = NULL; } mtx_unlock(&mhc->mhc_free_lock); return mh; } void vmbus_msghc_reset(struct vmbus_msghc *mh, size_t dsize) { struct hypercall_postmsg_in *inprm; if (dsize > HYPERCALL_POSTMSGIN_DSIZE_MAX) panic("invalid data size %zu", dsize); inprm = mh->mh_inprm; memset(inprm, 0, HYPERCALL_POSTMSGIN_SIZE); inprm->hc_connid = VMBUS_CONNID_MESSAGE; inprm->hc_msgtype = HYPERV_MSGTYPE_CHANNEL; inprm->hc_dsize = dsize; } struct vmbus_msghc * vmbus_msghc_get(struct vmbus_softc *sc, size_t dsize) { struct vmbus_msghc *mh; if (dsize > HYPERCALL_POSTMSGIN_DSIZE_MAX) panic("invalid data size %zu", dsize); mh = vmbus_msghc_get1(sc->vmbus_msg_hc, VMBUS_MSGHC_CTXF_DESTROY); if (mh == NULL) return NULL; vmbus_msghc_reset(mh, dsize); return mh; } void vmbus_msghc_put(struct vmbus_softc *sc, struct vmbus_msghc *mh) { struct vmbus_msghc_ctx *mhc = sc->vmbus_msg_hc; KASSERT(mhc->mhc_active == NULL, ("msg hypercall is active")); mh->mh_resp = NULL; mtx_lock(&mhc->mhc_free_lock); KASSERT(mhc->mhc_free == NULL, ("has free hypercall msg")); mhc->mhc_free = mh; mtx_unlock(&mhc->mhc_free_lock); wakeup(&mhc->mhc_free); } void * vmbus_msghc_dataptr(struct vmbus_msghc *mh) { return mh->mh_inprm->hc_data; } static void vmbus_msghc_ctx_destroy(struct vmbus_msghc_ctx *mhc) { struct vmbus_msghc *mh; mtx_lock(&mhc->mhc_free_lock); mhc->mhc_flags |= VMBUS_MSGHC_CTXF_DESTROY; mtx_unlock(&mhc->mhc_free_lock); wakeup(&mhc->mhc_free); mh = vmbus_msghc_get1(mhc, 0); if (mh == NULL) panic("can't get msghc"); vmbus_msghc_free(mh); vmbus_msghc_ctx_free(mhc); } int vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) { sbintime_t time = SBT_1MS; int i; /* * Save the input parameter so that we could restore the input * parameter if the Hypercall failed. * * XXX * Is this really necessary?! i.e. Will the Hypercall ever * overwrite the input parameter? */ memcpy(&mh->mh_inprm_save, mh->mh_inprm, HYPERCALL_POSTMSGIN_SIZE); /* * In order to cope with transient failures, e.g. insufficient * resources on host side, we retry the post message Hypercall * several times. 20 retries seem sufficient. */ #define HC_RETRY_MAX 20 for (i = 0; i < HC_RETRY_MAX; ++i) { uint64_t status; status = hypercall_post_message(mh->mh_inprm_dma.hv_paddr); if (status == HYPERCALL_STATUS_SUCCESS) return 0; pause_sbt("hcpmsg", time, 0, C_HARDCLOCK); if (time < SBT_1S * 2) time *= 2; /* Restore input parameter and try again */ memcpy(mh->mh_inprm, &mh->mh_inprm_save, HYPERCALL_POSTMSGIN_SIZE); } #undef HC_RETRY_MAX return EIO; } int vmbus_msghc_exec(struct vmbus_softc *sc, struct vmbus_msghc *mh) { struct vmbus_msghc_ctx *mhc = sc->vmbus_msg_hc; int error; KASSERT(mh->mh_resp == NULL, ("hypercall msg has pending response")); mtx_lock(&mhc->mhc_active_lock); KASSERT(mhc->mhc_active == NULL, ("pending active msg hypercall")); mhc->mhc_active = mh; mtx_unlock(&mhc->mhc_active_lock); error = vmbus_msghc_exec_noresult(mh); if (error) { mtx_lock(&mhc->mhc_active_lock); KASSERT(mhc->mhc_active == mh, ("msghc mismatch")); mhc->mhc_active = NULL; mtx_unlock(&mhc->mhc_active_lock); } return error; } const struct vmbus_message * vmbus_msghc_wait_result(struct vmbus_softc *sc, struct vmbus_msghc *mh) { struct vmbus_msghc_ctx *mhc = sc->vmbus_msg_hc; mtx_lock(&mhc->mhc_active_lock); KASSERT(mhc->mhc_active == mh, ("msghc mismatch")); while (mh->mh_resp == NULL) { mtx_sleep(&mhc->mhc_active, &mhc->mhc_active_lock, 0, "wmsghc", 0); } mhc->mhc_active = NULL; mtx_unlock(&mhc->mhc_active_lock); return mh->mh_resp; } void vmbus_msghc_wakeup(struct vmbus_softc *sc, const struct vmbus_message *msg) { struct vmbus_msghc_ctx *mhc = sc->vmbus_msg_hc; struct vmbus_msghc *mh; mtx_lock(&mhc->mhc_active_lock); mh = mhc->mhc_active; KASSERT(mh != NULL, ("no pending msg hypercall")); memcpy(&mh->mh_resp0, msg, sizeof(mh->mh_resp0)); mh->mh_resp = &mh->mh_resp0; mtx_unlock(&mhc->mhc_active_lock); wakeup(&mhc->mhc_active); } static int vmbus_connect(struct vmbus_softc *sc, uint32_t version) { struct vmbus_chanmsg_connect *req; const struct vmbus_message *msg; struct vmbus_msghc *mh; int error, done = 0; mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) return ENXIO; req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CONNECT; req->chm_ver = version; req->chm_evtflags = sc->vmbus_evtflags_dma.hv_paddr; req->chm_mnf1 = sc->vmbus_mnf1_dma.hv_paddr; req->chm_mnf2 = sc->vmbus_mnf2_dma.hv_paddr; error = vmbus_msghc_exec(sc, mh); if (error) { vmbus_msghc_put(sc, mh); return error; } msg = vmbus_msghc_wait_result(sc, mh); done = ((const struct vmbus_chanmsg_connect_resp *) msg->msg_data)->chm_done; vmbus_msghc_put(sc, mh); return (done ? 0 : EOPNOTSUPP); } static int vmbus_init(struct vmbus_softc *sc) { int i; for (i = 0; i < nitems(vmbus_version); ++i) { int error; error = vmbus_connect(sc, vmbus_version[i]); if (!error) { hv_vmbus_protocal_version = vmbus_version[i]; device_printf(sc->vmbus_dev, "version %u.%u\n", (hv_vmbus_protocal_version >> 16), (hv_vmbus_protocal_version & 0xffff)); return 0; } } return ENXIO; } static void vmbus_disconnect(struct vmbus_softc *sc) { struct vmbus_chanmsg_disconnect *req; struct vmbus_msghc *mh; int error; mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) { device_printf(sc->vmbus_dev, "can not get msg hypercall for disconnect\n"); return; } req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_DISCONNECT; error = vmbus_msghc_exec_noresult(mh); vmbus_msghc_put(sc, mh); if (error) { device_printf(sc->vmbus_dev, "disconnect msg hypercall failed\n"); } } static int vmbus_req_channels(struct vmbus_softc *sc) { struct vmbus_chanmsg_chrequest *req; struct vmbus_msghc *mh; int error; mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) return ENXIO; req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHREQUEST; error = vmbus_msghc_exec_noresult(mh); vmbus_msghc_put(sc, mh); return error; } void vmbus_scan_newchan(struct vmbus_softc *sc) { mtx_lock(&sc->vmbus_scan_lock); if ((sc->vmbus_scan_chcnt & VMBUS_SCAN_CHCNT_DONE) == 0) sc->vmbus_scan_chcnt++; mtx_unlock(&sc->vmbus_scan_lock); } void vmbus_scan_done(struct vmbus_softc *sc) { mtx_lock(&sc->vmbus_scan_lock); sc->vmbus_scan_chcnt |= VMBUS_SCAN_CHCNT_DONE; mtx_unlock(&sc->vmbus_scan_lock); wakeup(&sc->vmbus_scan_chcnt); } static void vmbus_scan_newdev(struct vmbus_softc *sc) { mtx_lock(&sc->vmbus_scan_lock); sc->vmbus_scan_devcnt++; mtx_unlock(&sc->vmbus_scan_lock); wakeup(&sc->vmbus_scan_devcnt); } static void vmbus_scan_wait(struct vmbus_softc *sc) { uint32_t chancnt; mtx_lock(&sc->vmbus_scan_lock); while ((sc->vmbus_scan_chcnt & VMBUS_SCAN_CHCNT_DONE) == 0) { mtx_sleep(&sc->vmbus_scan_chcnt, &sc->vmbus_scan_lock, 0, "waitch", 0); } chancnt = sc->vmbus_scan_chcnt & ~VMBUS_SCAN_CHCNT_DONE; while (sc->vmbus_scan_devcnt != chancnt) { mtx_sleep(&sc->vmbus_scan_devcnt, &sc->vmbus_scan_lock, 0, "waitdev", 0); } mtx_unlock(&sc->vmbus_scan_lock); } static int vmbus_scan(struct vmbus_softc *sc) { int error; /* * Start vmbus scanning. */ error = vmbus_req_channels(sc); if (error) { device_printf(sc->vmbus_dev, "channel request failed: %d\n", error); return error; } /* * Wait for all devices are added to vmbus. */ vmbus_scan_wait(sc); /* * Identify, probe and attach. */ bus_generic_probe(sc->vmbus_dev); bus_generic_attach(sc->vmbus_dev); if (bootverbose) { device_printf(sc->vmbus_dev, "device scan, probe and attach " "done\n"); } return 0; } static void vmbus_msg_task(void *xsc, int pending __unused) { struct vmbus_softc *sc = xsc; volatile struct vmbus_message *msg; msg = VMBUS_PCPU_GET(sc, message, curcpu) + VMBUS_SINT_MESSAGE; for (;;) { if (msg->msg_type == HYPERV_MSGTYPE_NONE) { /* No message */ break; } else if (msg->msg_type == HYPERV_MSGTYPE_CHANNEL) { /* Channel message */ vmbus_chan_msgproc(sc, __DEVOLATILE(const struct vmbus_message *, msg)); } msg->msg_type = HYPERV_MSGTYPE_NONE; /* * Make sure the write to msg_type (i.e. set to * HYPERV_MSGTYPE_NONE) happens before we read the * msg_flags and EOMing. Otherwise, the EOMing will * not deliver any more messages since there is no * empty slot * * NOTE: * mb() is used here, since atomic_thread_fence_seq_cst() * will become compiler fence on UP kernel. */ mb(); if (msg->msg_flags & VMBUS_MSGFLAG_PENDING) { /* * This will cause message queue rescan to possibly * deliver another msg from the hypervisor */ wrmsr(MSR_HV_EOM, 0); } } } static __inline int vmbus_handle_intr1(struct vmbus_softc *sc, struct trapframe *frame, int cpu) { volatile struct vmbus_message *msg; struct vmbus_message *msg_base; msg_base = VMBUS_PCPU_GET(sc, message, cpu); /* * Check event timer. * * TODO: move this to independent IDT vector. */ msg = msg_base + VMBUS_SINT_TIMER; if (msg->msg_type == HYPERV_MSGTYPE_TIMER_EXPIRED) { msg->msg_type = HYPERV_MSGTYPE_NONE; vmbus_et_intr(frame); /* * Make sure the write to msg_type (i.e. set to * HYPERV_MSGTYPE_NONE) happens before we read the * msg_flags and EOMing. Otherwise, the EOMing will * not deliver any more messages since there is no * empty slot * * NOTE: * mb() is used here, since atomic_thread_fence_seq_cst() * will become compiler fence on UP kernel. */ mb(); if (msg->msg_flags & VMBUS_MSGFLAG_PENDING) { /* * This will cause message queue rescan to possibly * deliver another msg from the hypervisor */ wrmsr(MSR_HV_EOM, 0); } } /* * Check events. Hot path for network and storage I/O data; high rate. * * NOTE: * As recommended by the Windows guest fellows, we check events before * checking messages. */ sc->vmbus_event_proc(sc, cpu); /* * Check messages. Mainly management stuffs; ultra low rate. */ msg = msg_base + VMBUS_SINT_MESSAGE; if (__predict_false(msg->msg_type != HYPERV_MSGTYPE_NONE)) { taskqueue_enqueue(VMBUS_PCPU_GET(sc, message_tq, cpu), VMBUS_PCPU_PTR(sc, message_task, cpu)); } return (FILTER_HANDLED); } void vmbus_handle_intr(struct trapframe *trap_frame) { struct vmbus_softc *sc = vmbus_get_softc(); int cpu = curcpu; /* * Disable preemption. */ critical_enter(); /* * Do a little interrupt counting. */ (*VMBUS_PCPU_GET(sc, intr_cnt, cpu))++; vmbus_handle_intr1(sc, trap_frame, cpu); /* * Enable preemption. */ critical_exit(); } static void vmbus_synic_setup(void *xsc) { struct vmbus_softc *sc = xsc; int cpu = curcpu; uint64_t val, orig; uint32_t sint; if (hyperv_features & CPUID_HV_MSR_VP_INDEX) { /* * Save virtual processor id. */ VMBUS_PCPU_GET(sc, vcpuid, cpu) = rdmsr(MSR_HV_VP_INDEX); } else { /* * XXX * Virtual processoor id is only used by a pretty broken * channel selection code from storvsc. It's nothing * critical even if CPUID_HV_MSR_VP_INDEX is not set; keep * moving on. */ VMBUS_PCPU_GET(sc, vcpuid, cpu) = cpu; } /* * Setup the SynIC message. */ orig = rdmsr(MSR_HV_SIMP); val = MSR_HV_SIMP_ENABLE | (orig & MSR_HV_SIMP_RSVD_MASK) | ((VMBUS_PCPU_GET(sc, message_dma.hv_paddr, cpu) >> PAGE_SHIFT) << MSR_HV_SIMP_PGSHIFT); wrmsr(MSR_HV_SIMP, val); /* * Setup the SynIC event flags. */ orig = rdmsr(MSR_HV_SIEFP); val = MSR_HV_SIEFP_ENABLE | (orig & MSR_HV_SIEFP_RSVD_MASK) | ((VMBUS_PCPU_GET(sc, event_flags_dma.hv_paddr, cpu) >> PAGE_SHIFT) << MSR_HV_SIEFP_PGSHIFT); wrmsr(MSR_HV_SIEFP, val); /* * Configure and unmask SINT for message and event flags. */ sint = MSR_HV_SINT0 + VMBUS_SINT_MESSAGE; orig = rdmsr(sint); val = sc->vmbus_idtvec | MSR_HV_SINT_AUTOEOI | (orig & MSR_HV_SINT_RSVD_MASK); wrmsr(sint, val); /* * Configure and unmask SINT for timer. */ sint = MSR_HV_SINT0 + VMBUS_SINT_TIMER; orig = rdmsr(sint); val = sc->vmbus_idtvec | MSR_HV_SINT_AUTOEOI | (orig & MSR_HV_SINT_RSVD_MASK); wrmsr(sint, val); /* * All done; enable SynIC. */ orig = rdmsr(MSR_HV_SCONTROL); val = MSR_HV_SCTRL_ENABLE | (orig & MSR_HV_SCTRL_RSVD_MASK); wrmsr(MSR_HV_SCONTROL, val); } static void vmbus_synic_teardown(void *arg) { uint64_t orig; uint32_t sint; /* * Disable SynIC. */ orig = rdmsr(MSR_HV_SCONTROL); wrmsr(MSR_HV_SCONTROL, (orig & MSR_HV_SCTRL_RSVD_MASK)); /* * Mask message and event flags SINT. */ sint = MSR_HV_SINT0 + VMBUS_SINT_MESSAGE; orig = rdmsr(sint); wrmsr(sint, orig | MSR_HV_SINT_MASKED); /* * Mask timer SINT. */ sint = MSR_HV_SINT0 + VMBUS_SINT_TIMER; orig = rdmsr(sint); wrmsr(sint, orig | MSR_HV_SINT_MASKED); /* * Teardown SynIC message. */ orig = rdmsr(MSR_HV_SIMP); wrmsr(MSR_HV_SIMP, (orig & MSR_HV_SIMP_RSVD_MASK)); /* * Teardown SynIC event flags. */ orig = rdmsr(MSR_HV_SIEFP); wrmsr(MSR_HV_SIEFP, (orig & MSR_HV_SIEFP_RSVD_MASK)); } static int vmbus_dma_alloc(struct vmbus_softc *sc) { bus_dma_tag_t parent_dtag; uint8_t *evtflags; int cpu; parent_dtag = bus_get_dma_tag(sc->vmbus_dev); CPU_FOREACH(cpu) { void *ptr; /* * Per-cpu messages and event flags. */ ptr = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, PAGE_SIZE, VMBUS_PCPU_PTR(sc, message_dma, cpu), BUS_DMA_WAITOK | BUS_DMA_ZERO); if (ptr == NULL) return ENOMEM; VMBUS_PCPU_GET(sc, message, cpu) = ptr; ptr = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, PAGE_SIZE, VMBUS_PCPU_PTR(sc, event_flags_dma, cpu), BUS_DMA_WAITOK | BUS_DMA_ZERO); if (ptr == NULL) return ENOMEM; VMBUS_PCPU_GET(sc, event_flags, cpu) = ptr; } evtflags = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, PAGE_SIZE, &sc->vmbus_evtflags_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); if (evtflags == NULL) return ENOMEM; sc->vmbus_rx_evtflags = (u_long *)evtflags; sc->vmbus_tx_evtflags = (u_long *)(evtflags + (PAGE_SIZE / 2)); sc->vmbus_evtflags = evtflags; sc->vmbus_mnf1 = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, PAGE_SIZE, &sc->vmbus_mnf1_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); if (sc->vmbus_mnf1 == NULL) return ENOMEM; sc->vmbus_mnf2 = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, PAGE_SIZE, &sc->vmbus_mnf2_dma, BUS_DMA_WAITOK | BUS_DMA_ZERO); if (sc->vmbus_mnf2 == NULL) return ENOMEM; return 0; } static void vmbus_dma_free(struct vmbus_softc *sc) { int cpu; if (sc->vmbus_evtflags != NULL) { hyperv_dmamem_free(&sc->vmbus_evtflags_dma, sc->vmbus_evtflags); sc->vmbus_evtflags = NULL; sc->vmbus_rx_evtflags = NULL; sc->vmbus_tx_evtflags = NULL; } if (sc->vmbus_mnf1 != NULL) { hyperv_dmamem_free(&sc->vmbus_mnf1_dma, sc->vmbus_mnf1); sc->vmbus_mnf1 = NULL; } if (sc->vmbus_mnf2 != NULL) { hyperv_dmamem_free(&sc->vmbus_mnf2_dma, sc->vmbus_mnf2); sc->vmbus_mnf2 = NULL; } CPU_FOREACH(cpu) { if (VMBUS_PCPU_GET(sc, message, cpu) != NULL) { hyperv_dmamem_free( VMBUS_PCPU_PTR(sc, message_dma, cpu), VMBUS_PCPU_GET(sc, message, cpu)); VMBUS_PCPU_GET(sc, message, cpu) = NULL; } if (VMBUS_PCPU_GET(sc, event_flags, cpu) != NULL) { hyperv_dmamem_free( VMBUS_PCPU_PTR(sc, event_flags_dma, cpu), VMBUS_PCPU_GET(sc, event_flags, cpu)); VMBUS_PCPU_GET(sc, event_flags, cpu) = NULL; } } } static int vmbus_intr_setup(struct vmbus_softc *sc) { int cpu; CPU_FOREACH(cpu) { char buf[MAXCOMLEN + 1]; cpuset_t cpu_mask; /* Allocate an interrupt counter for Hyper-V interrupt */ snprintf(buf, sizeof(buf), "cpu%d:hyperv", cpu); intrcnt_add(buf, VMBUS_PCPU_PTR(sc, intr_cnt, cpu)); /* * Setup taskqueue to handle events. Task will be per- * channel. */ VMBUS_PCPU_GET(sc, event_tq, cpu) = taskqueue_create_fast( "hyperv event", M_WAITOK, taskqueue_thread_enqueue, VMBUS_PCPU_PTR(sc, event_tq, cpu)); CPU_SETOF(cpu, &cpu_mask); taskqueue_start_threads_cpuset( VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET, &cpu_mask, "hvevent%d", cpu); /* * Setup tasks and taskqueues to handle messages. */ VMBUS_PCPU_GET(sc, message_tq, cpu) = taskqueue_create_fast( "hyperv msg", M_WAITOK, taskqueue_thread_enqueue, VMBUS_PCPU_PTR(sc, message_tq, cpu)); CPU_SETOF(cpu, &cpu_mask); taskqueue_start_threads_cpuset( VMBUS_PCPU_PTR(sc, message_tq, cpu), 1, PI_NET, &cpu_mask, "hvmsg%d", cpu); TASK_INIT(VMBUS_PCPU_PTR(sc, message_task, cpu), 0, vmbus_msg_task, sc); } /* * All Hyper-V ISR required resources are setup, now let's find a * free IDT vector for Hyper-V ISR and set it up. */ sc->vmbus_idtvec = lapic_ipi_alloc(IDTVEC(vmbus_isr)); if (sc->vmbus_idtvec < 0) { device_printf(sc->vmbus_dev, "cannot find free IDT vector\n"); return ENXIO; } if(bootverbose) { device_printf(sc->vmbus_dev, "vmbus IDT vector %d\n", sc->vmbus_idtvec); } return 0; } static void vmbus_intr_teardown(struct vmbus_softc *sc) { int cpu; if (sc->vmbus_idtvec >= 0) { lapic_ipi_free(sc->vmbus_idtvec); sc->vmbus_idtvec = -1; } CPU_FOREACH(cpu) { if (VMBUS_PCPU_GET(sc, event_tq, cpu) != NULL) { taskqueue_free(VMBUS_PCPU_GET(sc, event_tq, cpu)); VMBUS_PCPU_GET(sc, event_tq, cpu) = NULL; } if (VMBUS_PCPU_GET(sc, message_tq, cpu) != NULL) { taskqueue_drain(VMBUS_PCPU_GET(sc, message_tq, cpu), VMBUS_PCPU_PTR(sc, message_task, cpu)); taskqueue_free(VMBUS_PCPU_GET(sc, message_tq, cpu)); VMBUS_PCPU_GET(sc, message_tq, cpu) = NULL; } } } static int vmbus_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) { struct hv_device *child_dev_ctx = device_get_ivars(child); switch (index) { case HV_VMBUS_IVAR_TYPE: *result = (uintptr_t)&child_dev_ctx->class_id; return (0); case HV_VMBUS_IVAR_INSTANCE: *result = (uintptr_t)&child_dev_ctx->device_id; return (0); case HV_VMBUS_IVAR_DEVCTX: *result = (uintptr_t)child_dev_ctx; return (0); case HV_VMBUS_IVAR_NODE: *result = (uintptr_t)child_dev_ctx->device; return (0); } return (ENOENT); } static int vmbus_write_ivar(device_t dev, device_t child, int index, uintptr_t value) { switch (index) { case HV_VMBUS_IVAR_TYPE: case HV_VMBUS_IVAR_INSTANCE: case HV_VMBUS_IVAR_DEVCTX: case HV_VMBUS_IVAR_NODE: /* read-only */ return (EINVAL); } return (ENOENT); } static int vmbus_child_pnpinfo_str(device_t dev, device_t child, char *buf, size_t buflen) { struct hv_device *dev_ctx = device_get_ivars(child); char guidbuf[HYPERV_GUID_STRLEN]; if (dev_ctx == NULL) return (0); strlcat(buf, "classid=", buflen); hyperv_guid2str(&dev_ctx->class_id, guidbuf, sizeof(guidbuf)); strlcat(buf, guidbuf, buflen); strlcat(buf, " deviceid=", buflen); hyperv_guid2str(&dev_ctx->device_id, guidbuf, sizeof(guidbuf)); strlcat(buf, guidbuf, buflen); return (0); } struct hv_device * hv_vmbus_child_device_create(hv_guid type, hv_guid instance, hv_vmbus_channel *channel) { hv_device *child_dev; /* * Allocate the new child device */ child_dev = malloc(sizeof(hv_device), M_DEVBUF, M_WAITOK | M_ZERO); child_dev->channel = channel; memcpy(&child_dev->class_id, &type, sizeof(hv_guid)); memcpy(&child_dev->device_id, &instance, sizeof(hv_guid)); return (child_dev); } void hv_vmbus_child_device_register(struct vmbus_softc *sc, struct hv_device *child_dev) { device_t child, parent; parent = sc->vmbus_dev; if (bootverbose) { char name[HYPERV_GUID_STRLEN]; hyperv_guid2str(&child_dev->class_id, name, sizeof(name)); device_printf(parent, "add device, classid: %s\n", name); } child = device_add_child(parent, NULL, -1); child_dev->device = child; device_set_ivars(child, child_dev); /* New device was added to vmbus */ vmbus_scan_newdev(sc); } int hv_vmbus_child_device_unregister(struct hv_device *child_dev) { int ret = 0; /* * XXXKYS: Ensure that this is the opposite of * device_add_child() */ mtx_lock(&Giant); ret = device_delete_child(vmbus_get_device(), child_dev->device); mtx_unlock(&Giant); return(ret); } static int vmbus_sysctl_version(SYSCTL_HANDLER_ARGS) { char verstr[16]; snprintf(verstr, sizeof(verstr), "%u.%u", hv_vmbus_protocal_version >> 16, hv_vmbus_protocal_version & 0xffff); return sysctl_handle_string(oidp, verstr, sizeof(verstr), req); } static int vmbus_probe(device_t dev) { char *id[] = { "VMBUS", NULL }; if (ACPI_ID_PROBE(device_get_parent(dev), dev, id) == NULL || device_get_unit(dev) != 0 || vm_guest != VM_GUEST_HV || (hyperv_features & CPUID_HV_MSR_SYNIC) == 0) return (ENXIO); device_set_desc(dev, "Hyper-V Vmbus"); return (BUS_PROBE_DEFAULT); } /** * @brief Main vmbus driver initialization routine. * * Here, we * - initialize the vmbus driver context * - setup various driver entry points * - invoke the vmbus hv main init routine * - get the irq resource * - invoke the vmbus to add the vmbus root device * - setup the vmbus root device * - retrieve the channel offers */ static int vmbus_doattach(struct vmbus_softc *sc) { struct sysctl_oid_list *child; struct sysctl_ctx_list *ctx; int ret; if (sc->vmbus_flags & VMBUS_FLAG_ATTACHED) return (0); sc->vmbus_flags |= VMBUS_FLAG_ATTACHED; mtx_init(&sc->vmbus_scan_lock, "vmbus scan", NULL, MTX_DEF); /* * Create context for "post message" Hypercalls */ sc->vmbus_msg_hc = vmbus_msghc_ctx_create( bus_get_dma_tag(sc->vmbus_dev)); if (sc->vmbus_msg_hc == NULL) { ret = ENXIO; goto cleanup; } /* * Allocate DMA stuffs. */ ret = vmbus_dma_alloc(sc); if (ret != 0) goto cleanup; /* * Setup interrupt. */ ret = vmbus_intr_setup(sc); if (ret != 0) goto cleanup; /* * Setup SynIC. */ if (bootverbose) device_printf(sc->vmbus_dev, "smp_started = %d\n", smp_started); smp_rendezvous(NULL, vmbus_synic_setup, NULL, sc); sc->vmbus_flags |= VMBUS_FLAG_SYNIC; /* * Connect to VMBus in the root partition */ ret = hv_vmbus_connect(sc); if (ret != 0) goto cleanup; ret = vmbus_init(sc); if (ret != 0) goto cleanup; if (hv_vmbus_protocal_version == HV_VMBUS_VERSION_WS2008 || hv_vmbus_protocal_version == HV_VMBUS_VERSION_WIN7) sc->vmbus_event_proc = vmbus_event_proc_compat; else sc->vmbus_event_proc = vmbus_event_proc; ret = vmbus_scan(sc); if (ret != 0) goto cleanup; ctx = device_get_sysctl_ctx(sc->vmbus_dev); child = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->vmbus_dev)); SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "version", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, vmbus_sysctl_version, "A", "vmbus version"); return (ret); cleanup: vmbus_intr_teardown(sc); vmbus_dma_free(sc); if (sc->vmbus_msg_hc != NULL) { vmbus_msghc_ctx_destroy(sc->vmbus_msg_hc); sc->vmbus_msg_hc = NULL; } mtx_destroy(&sc->vmbus_scan_lock); return (ret); } static void vmbus_event_proc_dummy(struct vmbus_softc *sc __unused, int cpu __unused) { } static int vmbus_attach(device_t dev) { vmbus_sc = device_get_softc(dev); vmbus_sc->vmbus_dev = dev; vmbus_sc->vmbus_idtvec = -1; /* * Event processing logic will be configured: * - After the vmbus protocol version negotiation. * - Before we request channel offers. */ vmbus_sc->vmbus_event_proc = vmbus_event_proc_dummy; #ifndef EARLY_AP_STARTUP /* * If the system has already booted and thread * scheduling is possible indicated by the global * cold set to zero, we just call the driver * initialization directly. */ if (!cold) #endif vmbus_doattach(vmbus_sc); return (0); } static void vmbus_sysinit(void *arg __unused) { struct vmbus_softc *sc = vmbus_get_softc(); if (vm_guest != VM_GUEST_HV || sc == NULL) return; #ifndef EARLY_AP_STARTUP /* * If the system has already booted and thread * scheduling is possible, as indicated by the * global cold set to zero, we just call the driver * initialization directly. */ if (!cold) #endif vmbus_doattach(sc); } static int vmbus_detach(device_t dev) { struct vmbus_softc *sc = device_get_softc(dev); hv_vmbus_release_unattached_channels(); vmbus_disconnect(sc); hv_vmbus_disconnect(); if (sc->vmbus_flags & VMBUS_FLAG_SYNIC) { sc->vmbus_flags &= ~VMBUS_FLAG_SYNIC; smp_rendezvous(NULL, vmbus_synic_teardown, NULL, NULL); } vmbus_intr_teardown(sc); vmbus_dma_free(sc); if (sc->vmbus_msg_hc != NULL) { vmbus_msghc_ctx_destroy(sc->vmbus_msg_hc); sc->vmbus_msg_hc = NULL; } mtx_destroy(&sc->vmbus_scan_lock); return (0); } static device_method_t vmbus_methods[] = { /* Device interface */ DEVMETHOD(device_probe, vmbus_probe), DEVMETHOD(device_attach, vmbus_attach), DEVMETHOD(device_detach, vmbus_detach), DEVMETHOD(device_shutdown, bus_generic_shutdown), DEVMETHOD(device_suspend, bus_generic_suspend), DEVMETHOD(device_resume, bus_generic_resume), /* Bus interface */ DEVMETHOD(bus_add_child, bus_generic_add_child), DEVMETHOD(bus_print_child, bus_generic_print_child), DEVMETHOD(bus_read_ivar, vmbus_read_ivar), DEVMETHOD(bus_write_ivar, vmbus_write_ivar), DEVMETHOD(bus_child_pnpinfo_str, vmbus_child_pnpinfo_str), DEVMETHOD_END }; static driver_t vmbus_driver = { "vmbus", vmbus_methods, sizeof(struct vmbus_softc) }; static devclass_t vmbus_devclass; DRIVER_MODULE(vmbus, acpi, vmbus_driver, vmbus_devclass, NULL, NULL); MODULE_DEPEND(vmbus, acpi, 1, 1, 1); MODULE_VERSION(vmbus, 1); #ifndef EARLY_AP_STARTUP /* * NOTE: * We have to start as the last step of SI_SUB_SMP, i.e. after SMP is * initialized. */ SYSINIT(vmbus_initialize, SI_SUB_SMP, SI_ORDER_ANY, vmbus_sysinit, NULL); #endif