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sys/dev/hyperv/vmbus/vmbus_xact.c
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/*- | |||||
* 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_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; | |||||
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 | |||||
howard0su_gmail.com: Suggest to put FLAGS into the name to make it more explicit. | |||||
sepherosa_gmail.comAuthorUnsubmitted Not Done Inline ActionsIt's also a common practice to use YYY'F', if the macro name is getting too long. sepherosa_gmail.com: It's also a common practice to use YYY'F', if the macro name is getting too long. | |||||
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; | |||||
howard0su_gmail.comUnsubmitted Not Done Inline Actionsthis can be moved after dma alloc. howard0su_gmail.com: this can be moved after dma alloc. | |||||
sepherosa_gmail.comAuthorUnsubmitted Not Done Inline ActionsI don't see why it matters. sepherosa_gmail.com: I don't see why it matters. | |||||
/* 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); | |||||
} | |||||
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); | |||||
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) | |||||
{ | |||||
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_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_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); | |||||
} | |||||
void | |||||
vmbus_xact_wakeup(struct vmbus_xact *xact, const void *data, size_t dlen) | |||||
{ | |||||
struct vmbus_xact_ctx *ctx = xact->x_ctx; | |||||
size_t cplen = dlen; | |||||
if (cplen > ctx->xc_resp_size) { | |||||
printf("vmbus: xact response truncated %zu -> %zu\n", | |||||
cplen, ctx->xc_resp_size); | |||||
cplen = ctx->xc_resp_size; | |||||
} | |||||
mtx_lock(&ctx->xc_active_lock); | |||||
KASSERT(ctx->xc_active == xact, ("xact mismatch")); | |||||
memcpy(xact->x_resp0, data, cplen); | |||||
howard0su_gmail.comUnsubmitted Not Done Inline Actionscan we make resp0 as a stack variable? howard0su_gmail.com: can we make resp0 as a stack variable? | |||||
sepherosa_gmail.comAuthorUnsubmitted Not Done Inline ActionsNo, you can't. These API do not assume response size. sepherosa_gmail.com: No, you can't. These API do not assume response size. | |||||
xact->x_resp_len = cplen; | |||||
xact->x_resp = xact->x_resp0; | |||||
mtx_unlock(&ctx->xc_active_lock); | |||||
wakeup(&ctx->xc_active); | |||||
} |
Suggest to put FLAGS into the name to make it more explicit.