diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus')
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus.c | 233 | ||||
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus_var.h | 2 | ||||
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus_xact.c | 313 |
3 files changed, 357 insertions, 191 deletions
diff --git a/sys/dev/hyperv/vmbus/vmbus.c b/sys/dev/hyperv/vmbus/vmbus.c index 27e72fe..d6c47ba 100644 --- a/sys/dev/hyperv/vmbus/vmbus.c +++ b/sys/dev/hyperv/vmbus/vmbus.c @@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$"); #include <contrib/dev/acpica/include/acpi.h> #include <dev/hyperv/include/hyperv.h> +#include <dev/hyperv/include/vmbus_xact.h> #include <dev/hyperv/vmbus/hyperv_reg.h> #include <dev/hyperv/vmbus/hyperv_var.h> #include <dev/hyperv/vmbus/vmbus_reg.h> @@ -64,25 +65,10 @@ __FBSDID("$FreeBSD$"); #define VMBUS_GPADL_START 0xe1e10 struct vmbus_msghc { - struct hypercall_postmsg_in *mh_inprm; + struct vmbus_xact *mh_xact; 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_probe(device_t); static int vmbus_attach(device_t); static int vmbus_detach(device_t); @@ -118,15 +104,6 @@ static int vmbus_doattach(struct vmbus_softc *); static void vmbus_event_proc_dummy(struct vmbus_softc *, int); -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); - static struct vmbus_softc *vmbus_sc; extern inthand_t IDTVEC(rsvd), IDTVEC(vmbus_isr); @@ -184,85 +161,6 @@ vmbus_get_softc(void) return vmbus_sc; } -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_PARAM_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) { @@ -271,7 +169,7 @@ vmbus_msghc_reset(struct vmbus_msghc *mh, size_t dsize) if (dsize > HYPERCALL_POSTMSGIN_DSIZE_MAX) panic("invalid data size %zu", dsize); - inprm = mh->mh_inprm; + inprm = vmbus_xact_req_data(mh->mh_xact); memset(inprm, 0, HYPERCALL_POSTMSGIN_SIZE); inprm->hc_connid = VMBUS_CONNID_MESSAGE; inprm->hc_msgtype = HYPERV_MSGTYPE_CHANNEL; @@ -282,63 +180,50 @@ struct vmbus_msghc * vmbus_msghc_get(struct vmbus_softc *sc, size_t dsize) { struct vmbus_msghc *mh; + struct vmbus_xact *xact; 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; + xact = vmbus_xact_get(sc->vmbus_xc, + dsize + __offsetof(struct hypercall_postmsg_in, hc_data[0])); + if (xact == NULL) + return (NULL); + + mh = vmbus_xact_priv(xact, sizeof(*mh)); + mh->mh_xact = xact; vmbus_msghc_reset(mh, dsize); - return mh; + return (mh); } void -vmbus_msghc_put(struct vmbus_softc *sc, struct vmbus_msghc *mh) +vmbus_msghc_put(struct vmbus_softc *sc __unused, 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); + vmbus_xact_put(mh->mh_xact); } 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"); + struct hypercall_postmsg_in *inprm; - vmbus_msghc_free(mh); - vmbus_msghc_ctx_free(mhc); + inprm = vmbus_xact_req_data(mh->mh_xact); + return (inprm->hc_data); } int vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) { sbintime_t time = SBT_1MS; + struct hypercall_postmsg_in *inprm; + bus_addr_t inprm_paddr; int i; + inprm = vmbus_xact_req_data(mh->mh_xact); + inprm_paddr = vmbus_xact_req_paddr(mh->mh_xact); + /* * Save the input parameter so that we could restore the input * parameter if the Hypercall failed. @@ -347,7 +232,7 @@ vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) * 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); + memcpy(&mh->mh_inprm_save, inprm, HYPERCALL_POSTMSGIN_SIZE); /* * In order to cope with transient failures, e.g. insufficient @@ -359,7 +244,7 @@ vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) for (i = 0; i < HC_RETRY_MAX; ++i) { uint64_t status; - status = hypercall_post_message(mh->mh_inprm_dma.hv_paddr); + status = hypercall_post_message(inprm_paddr); if (status == HYPERCALL_STATUS_SUCCESS) return 0; @@ -368,8 +253,7 @@ vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) time *= 2; /* Restore input parameter and try again */ - memcpy(mh->mh_inprm, &mh->mh_inprm_save, - HYPERCALL_POSTMSGIN_SIZE); + memcpy(inprm, &mh->mh_inprm_save, HYPERCALL_POSTMSGIN_SIZE); } #undef HC_RETRY_MAX @@ -378,62 +262,30 @@ vmbus_msghc_exec_noresult(struct vmbus_msghc *mh) } int -vmbus_msghc_exec(struct vmbus_softc *sc, struct vmbus_msghc *mh) +vmbus_msghc_exec(struct vmbus_softc *sc __unused, 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); - + vmbus_xact_activate(mh->mh_xact); 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); - } + if (error) + vmbus_xact_deactivate(mh->mh_xact); return error; } const struct vmbus_message * -vmbus_msghc_wait_result(struct vmbus_softc *sc, struct vmbus_msghc *mh) +vmbus_msghc_wait_result(struct vmbus_softc *sc __unused, 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; + size_t resp_len; - mtx_unlock(&mhc->mhc_active_lock); - - return mh->mh_resp; + return (vmbus_xact_wait(mh->mh_xact, &resp_len)); } 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); + vmbus_xact_ctx_wakeup(sc->vmbus_xc, msg, sizeof(*msg)); } uint32_t @@ -1269,9 +1121,10 @@ vmbus_doattach(struct vmbus_softc *sc) /* * 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) { + sc->vmbus_xc = vmbus_xact_ctx_create(bus_get_dma_tag(sc->vmbus_dev), + HYPERCALL_POSTMSGIN_SIZE, VMBUS_MSG_SIZE, + sizeof(struct vmbus_msghc)); + if (sc->vmbus_xc == NULL) { ret = ENXIO; goto cleanup; } @@ -1326,9 +1179,9 @@ vmbus_doattach(struct vmbus_softc *sc) 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; + if (sc->vmbus_xc != NULL) { + vmbus_xact_ctx_destroy(sc->vmbus_xc); + sc->vmbus_xc = NULL; } free(sc->vmbus_chmap, M_DEVBUF); mtx_destroy(&sc->vmbus_scan_lock); @@ -1384,9 +1237,9 @@ vmbus_detach(device_t dev) 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; + if (sc->vmbus_xc != NULL) { + vmbus_xact_ctx_destroy(sc->vmbus_xc); + sc->vmbus_xc = NULL; } free(sc->vmbus_chmap, M_DEVBUF); diff --git a/sys/dev/hyperv/vmbus/vmbus_var.h b/sys/dev/hyperv/vmbus/vmbus_var.h index c278c15..47d9004 100644 --- a/sys/dev/hyperv/vmbus/vmbus_var.h +++ b/sys/dev/hyperv/vmbus/vmbus_var.h @@ -86,7 +86,7 @@ struct vmbus_softc { u_long *vmbus_rx_evtflags; /* compat evtflgs from host */ struct vmbus_channel **vmbus_chmap; - struct vmbus_msghc_ctx *vmbus_msg_hc; + struct vmbus_xact_ctx *vmbus_xc; struct vmbus_pcpu_data vmbus_pcpu[MAXCPU]; /* diff --git a/sys/dev/hyperv/vmbus/vmbus_xact.c b/sys/dev/hyperv/vmbus/vmbus_xact.c new file mode 100644 index 0000000..642c165 --- /dev/null +++ b/sys/dev/hyperv/vmbus/vmbus_xact.c @@ -0,0 +1,313 @@ +/*- + * Copyright (c) 2016 Microsoft Corp. + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/systm.h> + +#include <dev/hyperv/include/hyperv_busdma.h> +#include <dev/hyperv/include/vmbus_xact.h> + +struct vmbus_xact { + struct vmbus_xact_ctx *x_ctx; + void *x_priv; + + void *x_req; + struct hyperv_dma x_req_dma; + + const void *x_resp; + size_t x_resp_len; + void *x_resp0; +}; + +struct vmbus_xact_ctx { + uint32_t xc_flags; + size_t xc_req_size; + size_t xc_resp_size; + size_t xc_priv_size; + + struct vmbus_xact *xc_free; + struct mtx xc_free_lock; + + struct vmbus_xact *xc_active; + struct mtx xc_active_lock; +}; + +#define VMBUS_XACT_CTXF_DESTROY 0x0001 + +static struct vmbus_xact *vmbus_xact_alloc(struct vmbus_xact_ctx *, + bus_dma_tag_t); +static void vmbus_xact_free(struct vmbus_xact *); +static struct vmbus_xact *vmbus_xact_get1(struct vmbus_xact_ctx *, + uint32_t); + +static struct vmbus_xact * +vmbus_xact_alloc(struct vmbus_xact_ctx *ctx, bus_dma_tag_t parent_dtag) +{ + struct vmbus_xact *xact; + + xact = malloc(sizeof(*xact), M_DEVBUF, M_WAITOK | M_ZERO); + xact->x_ctx = ctx; + + /* XXX assume that page aligned is enough */ + xact->x_req = hyperv_dmamem_alloc(parent_dtag, PAGE_SIZE, 0, + ctx->xc_req_size, &xact->x_req_dma, BUS_DMA_WAITOK); + if (xact->x_req == NULL) { + free(xact, M_DEVBUF); + return (NULL); + } + if (ctx->xc_priv_size != 0) + xact->x_priv = malloc(ctx->xc_priv_size, M_DEVBUF, M_WAITOK); + xact->x_resp0 = malloc(ctx->xc_resp_size, M_DEVBUF, M_WAITOK); + + return (xact); +} + +static void +vmbus_xact_free(struct vmbus_xact *xact) +{ + + hyperv_dmamem_free(&xact->x_req_dma, xact->x_req); + free(xact->x_resp0, M_DEVBUF); + if (xact->x_priv != NULL) + free(xact->x_priv, M_DEVBUF); + free(xact, M_DEVBUF); +} + +static struct vmbus_xact * +vmbus_xact_get1(struct vmbus_xact_ctx *ctx, uint32_t dtor_flag) +{ + struct vmbus_xact *xact; + + mtx_lock(&ctx->xc_free_lock); + + while ((ctx->xc_flags & dtor_flag) == 0 && ctx->xc_free == NULL) + mtx_sleep(&ctx->xc_free, &ctx->xc_free_lock, 0, "gxact", 0); + if (ctx->xc_flags & dtor_flag) { + /* Being destroyed */ + xact = NULL; + } else { + xact = ctx->xc_free; + KASSERT(xact != NULL, ("no free xact")); + KASSERT(xact->x_resp == NULL, ("xact has pending response")); + ctx->xc_free = NULL; + } + + mtx_unlock(&ctx->xc_free_lock); + + return (xact); +} + +struct vmbus_xact_ctx * +vmbus_xact_ctx_create(bus_dma_tag_t dtag, size_t req_size, size_t resp_size, + size_t priv_size) +{ + struct vmbus_xact_ctx *ctx; + + ctx = malloc(sizeof(*ctx), M_DEVBUF, M_WAITOK | M_ZERO); + ctx->xc_req_size = req_size; + ctx->xc_resp_size = resp_size; + ctx->xc_priv_size = priv_size; + + ctx->xc_free = vmbus_xact_alloc(ctx, dtag); + if (ctx->xc_free == NULL) { + free(ctx, M_DEVBUF); + return (NULL); + } + + mtx_init(&ctx->xc_free_lock, "vmbus xact free", NULL, MTX_DEF); + mtx_init(&ctx->xc_active_lock, "vmbus xact active", NULL, MTX_DEF); + + return (ctx); +} + +void +vmbus_xact_ctx_destroy(struct vmbus_xact_ctx *ctx) +{ + struct vmbus_xact *xact; + + mtx_lock(&ctx->xc_free_lock); + ctx->xc_flags |= VMBUS_XACT_CTXF_DESTROY; + mtx_unlock(&ctx->xc_free_lock); + wakeup(&ctx->xc_free); + + xact = vmbus_xact_get1(ctx, 0); + if (xact == NULL) + panic("can't get xact"); + + vmbus_xact_free(xact); + mtx_destroy(&ctx->xc_free_lock); + mtx_destroy(&ctx->xc_active_lock); + free(ctx, M_DEVBUF); +} + +struct vmbus_xact * +vmbus_xact_get(struct vmbus_xact_ctx *ctx, size_t req_len) +{ + struct vmbus_xact *xact; + + if (req_len > ctx->xc_req_size) + panic("invalid request size %zu", req_len); + + xact = vmbus_xact_get1(ctx, VMBUS_XACT_CTXF_DESTROY); + if (xact == NULL) + return (NULL); + + memset(xact->x_req, 0, req_len); + return (xact); +} + +void +vmbus_xact_put(struct vmbus_xact *xact) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + + KASSERT(ctx->xc_active == NULL, ("pending active xact")); + xact->x_resp = NULL; + + mtx_lock(&ctx->xc_free_lock); + KASSERT(ctx->xc_free == NULL, ("has free xact")); + ctx->xc_free = xact; + mtx_unlock(&ctx->xc_free_lock); + wakeup(&ctx->xc_free); +} + +void * +vmbus_xact_req_data(const struct vmbus_xact *xact) +{ + + return (xact->x_req); +} + +bus_addr_t +vmbus_xact_req_paddr(const struct vmbus_xact *xact) +{ + + return (xact->x_req_dma.hv_paddr); +} + +void * +vmbus_xact_priv(const struct vmbus_xact *xact, size_t priv_len) +{ + + if (priv_len > xact->x_ctx->xc_priv_size) + panic("invalid priv size %zu", priv_len); + return (xact->x_priv); +} + +void +vmbus_xact_activate(struct vmbus_xact *xact) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + + KASSERT(xact->x_resp == NULL, ("xact has pending response")); + + mtx_lock(&ctx->xc_active_lock); + KASSERT(ctx->xc_active == NULL, ("pending active xact")); + ctx->xc_active = xact; + mtx_unlock(&ctx->xc_active_lock); +} + +void +vmbus_xact_deactivate(struct vmbus_xact *xact) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + + mtx_lock(&ctx->xc_active_lock); + KASSERT(ctx->xc_active == xact, ("xact mismatch")); + ctx->xc_active = NULL; + mtx_unlock(&ctx->xc_active_lock); +} + +const void * +vmbus_xact_wait(struct vmbus_xact *xact, size_t *resp_len) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + const void *resp; + + mtx_lock(&ctx->xc_active_lock); + + KASSERT(ctx->xc_active == xact, ("xact mismatch")); + while (xact->x_resp == NULL) { + mtx_sleep(&ctx->xc_active, &ctx->xc_active_lock, 0, + "wxact", 0); + } + ctx->xc_active = NULL; + + resp = xact->x_resp; + *resp_len = xact->x_resp_len; + + mtx_unlock(&ctx->xc_active_lock); + + return (resp); +} + +static void +vmbus_xact_save_resp(struct vmbus_xact *xact, const void *data, size_t dlen) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + size_t cplen = dlen; + + mtx_assert(&ctx->xc_active_lock, MA_OWNED); + + if (cplen > ctx->xc_resp_size) { + printf("vmbus: xact response truncated %zu -> %zu\n", + cplen, ctx->xc_resp_size); + cplen = ctx->xc_resp_size; + } + + KASSERT(ctx->xc_active == xact, ("xact mismatch")); + memcpy(xact->x_resp0, data, cplen); + xact->x_resp_len = cplen; + xact->x_resp = xact->x_resp0; +} + +void +vmbus_xact_wakeup(struct vmbus_xact *xact, const void *data, size_t dlen) +{ + struct vmbus_xact_ctx *ctx = xact->x_ctx; + + mtx_lock(&ctx->xc_active_lock); + vmbus_xact_save_resp(xact, data, dlen); + mtx_unlock(&ctx->xc_active_lock); + wakeup(&ctx->xc_active); +} + +void +vmbus_xact_ctx_wakeup(struct vmbus_xact_ctx *ctx, const void *data, size_t dlen) +{ + mtx_lock(&ctx->xc_active_lock); + KASSERT(ctx->xc_active != NULL, ("no pending xact")); + vmbus_xact_save_resp(ctx->xc_active, data, dlen); + mtx_unlock(&ctx->xc_active_lock); + wakeup(&ctx->xc_active); +} |
