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freebsd-dev/sys/dev/hyperv/vmbus/hv_channel.c
Sepherosa Ziehau 008024f2b8 hyperv/vmbus: Reduce the # of event loops by recording event flag count 
Use vmbus softc to save vmbus per-cpu data.  More stuffs will be moved
into vmbus softc.

MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D6403
2016-05-18 03:19:53 +00:00

1031 lines
28 KiB
C
Raw Blame History

/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <dev/hyperv/vmbus/hv_vmbus_priv.h>
#include <dev/hyperv/vmbus/vmbus_var.h>
static int vmbus_channel_create_gpadl_header(
/* must be phys and virt contiguous*/
void* contig_buffer,
/* page-size multiple */
uint32_t size,
hv_vmbus_channel_msg_info** msg_info,
uint32_t* message_count);
static void vmbus_channel_set_event(hv_vmbus_channel* channel);
static void VmbusProcessChannelEvent(void* channel, int pending);
/**
* @brief Trigger an event notification on the specified channel
*/
static void
vmbus_channel_set_event(hv_vmbus_channel *channel)
{
hv_vmbus_monitor_page *monitor_page;
if (channel->offer_msg.monitor_allocated) {
/* Each uint32_t represents 32 channels */
synch_set_bit((channel->offer_msg.child_rel_id & 31),
((uint32_t *)hv_vmbus_g_connection.send_interrupt_page
+ ((channel->offer_msg.child_rel_id >> 5))));
monitor_page = (hv_vmbus_monitor_page *)
hv_vmbus_g_connection.monitor_page_2;
synch_set_bit(channel->monitor_bit,
(uint32_t *)&monitor_page->
trigger_group[channel->monitor_group].u.pending);
} else {
hv_vmbus_set_event(channel);
}
}
static int
vmbus_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS)
{
struct hv_vmbus_channel *chan = arg1;
int alloc = 0;
if (chan->offer_msg.monitor_allocated)
alloc = 1;
return sysctl_handle_int(oidp, &alloc, 0, req);
}
static void
vmbus_channel_sysctl_create(hv_vmbus_channel* channel)
{
device_t dev;
struct sysctl_oid *devch_sysctl;
struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl;
struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl;
struct sysctl_ctx_list *ctx;
uint32_t ch_id;
uint16_t sub_ch_id;
char name[16];
hv_vmbus_channel* primary_ch = channel->primary_channel;
if (primary_ch == NULL) {
dev = channel->device->device;
ch_id = channel->offer_msg.child_rel_id;
} else {
dev = primary_ch->device->device;
ch_id = primary_ch->offer_msg.child_rel_id;
sub_ch_id = channel->offer_msg.offer.sub_channel_index;
}
ctx = device_get_sysctl_ctx(dev);
/* This creates dev.DEVNAME.DEVUNIT.channel tree */
devch_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
/* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */
snprintf(name, sizeof(name), "%d", ch_id);
devch_id_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(devch_sysctl),
OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
if (primary_ch != NULL) {
devch_sub_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(devch_id_sysctl),
OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
snprintf(name, sizeof(name), "%d", sub_ch_id);
devch_id_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(devch_sub_sysctl),
OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl),
OID_AUTO, "chanid", CTLFLAG_RD,
&channel->offer_msg.child_rel_id, 0, "channel id");
}
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO,
"cpu", CTLFLAG_RD, &channel->target_cpu, 0, "owner CPU id");
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO,
"monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
channel, 0, vmbus_channel_sysctl_monalloc, "I",
"is monitor allocated to this channel");
devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(devch_id_sysctl),
OID_AUTO,
"in",
CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(devch_id_sysctl),
OID_AUTO,
"out",
CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
hv_ring_buffer_stat(ctx,
SYSCTL_CHILDREN(devch_id_in_sysctl),
&(channel->inbound),
"inbound ring buffer stats");
hv_ring_buffer_stat(ctx,
SYSCTL_CHILDREN(devch_id_out_sysctl),
&(channel->outbound),
"outbound ring buffer stats");
}
/**
* @brief Open the specified channel
*/
int
hv_vmbus_channel_open(
hv_vmbus_channel* new_channel,
uint32_t send_ring_buffer_size,
uint32_t recv_ring_buffer_size,
void* user_data,
uint32_t user_data_len,
hv_vmbus_pfn_channel_callback pfn_on_channel_callback,
void* context)
{
int ret = 0;
void *in, *out;
hv_vmbus_channel_open_channel* open_msg;
hv_vmbus_channel_msg_info* open_info;
mtx_lock(&new_channel->sc_lock);
if (new_channel->state == HV_CHANNEL_OPEN_STATE) {
new_channel->state = HV_CHANNEL_OPENING_STATE;
} else {
mtx_unlock(&new_channel->sc_lock);
if(bootverbose)
printf("VMBUS: Trying to open channel <%p> which in "
"%d state.\n", new_channel, new_channel->state);
return (EINVAL);
}
mtx_unlock(&new_channel->sc_lock);
new_channel->on_channel_callback = pfn_on_channel_callback;
new_channel->channel_callback_context = context;
vmbus_on_channel_open(new_channel);
new_channel->rxq = hv_vmbus_g_context.hv_event_queue[new_channel->target_cpu];
TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel);
/* Allocate the ring buffer */
out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size),
M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
KASSERT(out != NULL,
("Error VMBUS: contigmalloc failed to allocate Ring Buffer!"));
if (out == NULL)
return (ENOMEM);
in = ((uint8_t *) out + send_ring_buffer_size);
new_channel->ring_buffer_pages = out;
new_channel->ring_buffer_page_count = (send_ring_buffer_size +
recv_ring_buffer_size) >> PAGE_SHIFT;
new_channel->ring_buffer_size = send_ring_buffer_size +
recv_ring_buffer_size;
hv_vmbus_ring_buffer_init(
&new_channel->outbound,
out,
send_ring_buffer_size);
hv_vmbus_ring_buffer_init(
&new_channel->inbound,
in,
recv_ring_buffer_size);
/* Create sysctl tree for this channel */
vmbus_channel_sysctl_create(new_channel);
/**
* Establish the gpadl for the ring buffer
*/
new_channel->ring_buffer_gpadl_handle = 0;
ret = hv_vmbus_channel_establish_gpadl(new_channel,
new_channel->outbound.ring_buffer,
send_ring_buffer_size + recv_ring_buffer_size,
&new_channel->ring_buffer_gpadl_handle);
/**
* Create and init the channel open message
*/
open_info = (hv_vmbus_channel_msg_info*) malloc(
sizeof(hv_vmbus_channel_msg_info) +
sizeof(hv_vmbus_channel_open_channel),
M_DEVBUF,
M_NOWAIT);
KASSERT(open_info != NULL,
("Error VMBUS: malloc failed to allocate Open Channel message!"));
if (open_info == NULL)
return (ENOMEM);
sema_init(&open_info->wait_sema, 0, "Open Info Sema");
open_msg = (hv_vmbus_channel_open_channel*) open_info->msg;
open_msg->header.message_type = HV_CHANNEL_MESSAGE_OPEN_CHANNEL;
open_msg->open_id = new_channel->offer_msg.child_rel_id;
open_msg->child_rel_id = new_channel->offer_msg.child_rel_id;
open_msg->ring_buffer_gpadl_handle =
new_channel->ring_buffer_gpadl_handle;
open_msg->downstream_ring_buffer_page_offset = send_ring_buffer_size
>> PAGE_SHIFT;
open_msg->target_vcpu = new_channel->target_vcpu;
if (user_data_len)
memcpy(open_msg->user_data, user_data, user_data_len);
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_INSERT_TAIL(
&hv_vmbus_g_connection.channel_msg_anchor,
open_info,
msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
ret = hv_vmbus_post_message(
open_msg, sizeof(hv_vmbus_channel_open_channel));
if (ret != 0)
goto cleanup;
ret = sema_timedwait(&open_info->wait_sema, 5 * hz); /* KYS 5 seconds */
if (ret) {
if(bootverbose)
printf("VMBUS: channel <%p> open timeout.\n", new_channel);
goto cleanup;
}
if (open_info->response.open_result.status == 0) {
new_channel->state = HV_CHANNEL_OPENED_STATE;
if(bootverbose)
printf("VMBUS: channel <%p> open success.\n", new_channel);
} else {
if(bootverbose)
printf("Error VMBUS: channel <%p> open failed - %d!\n",
new_channel, open_info->response.open_result.status);
}
cleanup:
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_REMOVE(
&hv_vmbus_g_connection.channel_msg_anchor,
open_info,
msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
sema_destroy(&open_info->wait_sema);
free(open_info, M_DEVBUF);
return (ret);
}
/**
* @brief Create a gpadl for the specified buffer
*/
static int
vmbus_channel_create_gpadl_header(
void* contig_buffer,
uint32_t size, /* page-size multiple */
hv_vmbus_channel_msg_info** msg_info,
uint32_t* message_count)
{
int i;
int page_count;
unsigned long long pfn;
uint32_t msg_size;
hv_vmbus_channel_gpadl_header* gpa_header;
hv_vmbus_channel_gpadl_body* gpadl_body;
hv_vmbus_channel_msg_info* msg_header;
hv_vmbus_channel_msg_info* msg_body;
int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize;
page_count = size >> PAGE_SHIFT;
pfn = hv_get_phys_addr(contig_buffer) >> PAGE_SHIFT;
/*do we need a gpadl body msg */
pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE
- sizeof(hv_vmbus_channel_gpadl_header)
- sizeof(hv_gpa_range);
pfnCount = pfnSize / sizeof(uint64_t);
if (page_count > pfnCount) { /* if(we need a gpadl body) */
/* fill in the header */
msg_size = sizeof(hv_vmbus_channel_msg_info)
+ sizeof(hv_vmbus_channel_gpadl_header)
+ sizeof(hv_gpa_range)
+ pfnCount * sizeof(uint64_t);
msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO);
KASSERT(
msg_header != NULL,
("Error VMBUS: malloc failed to allocate Gpadl Message!"));
if (msg_header == NULL)
return (ENOMEM);
TAILQ_INIT(&msg_header->sub_msg_list_anchor);
msg_header->message_size = msg_size;
gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg;
gpa_header->range_count = 1;
gpa_header->range_buf_len = sizeof(hv_gpa_range)
+ page_count * sizeof(uint64_t);
gpa_header->range[0].byte_offset = 0;
gpa_header->range[0].byte_count = size;
for (i = 0; i < pfnCount; i++) {
gpa_header->range[0].pfn_array[i] = pfn + i;
}
*msg_info = msg_header;
*message_count = 1;
pfnSum = pfnCount;
pfnLeft = page_count - pfnCount;
/*
* figure out how many pfns we can fit
*/
pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE
- sizeof(hv_vmbus_channel_gpadl_body);
pfnCount = pfnSize / sizeof(uint64_t);
/*
* fill in the body
*/
while (pfnLeft) {
if (pfnLeft > pfnCount) {
pfnCurr = pfnCount;
} else {
pfnCurr = pfnLeft;
}
msg_size = sizeof(hv_vmbus_channel_msg_info) +
sizeof(hv_vmbus_channel_gpadl_body) +
pfnCurr * sizeof(uint64_t);
msg_body = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO);
KASSERT(
msg_body != NULL,
("Error VMBUS: malloc failed to allocate Gpadl msg_body!"));
if (msg_body == NULL)
return (ENOMEM);
msg_body->message_size = msg_size;
(*message_count)++;
gpadl_body =
(hv_vmbus_channel_gpadl_body*) msg_body->msg;
/*
* gpadl_body->gpadl = kbuffer;
*/
for (i = 0; i < pfnCurr; i++) {
gpadl_body->pfn[i] = pfn + pfnSum + i;
}
TAILQ_INSERT_TAIL(
&msg_header->sub_msg_list_anchor,
msg_body,
msg_list_entry);
pfnSum += pfnCurr;
pfnLeft -= pfnCurr;
}
} else { /* else everything fits in a header */
msg_size = sizeof(hv_vmbus_channel_msg_info) +
sizeof(hv_vmbus_channel_gpadl_header) +
sizeof(hv_gpa_range) +
page_count * sizeof(uint64_t);
msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO);
KASSERT(
msg_header != NULL,
("Error VMBUS: malloc failed to allocate Gpadl Message!"));
if (msg_header == NULL)
return (ENOMEM);
msg_header->message_size = msg_size;
gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg;
gpa_header->range_count = 1;
gpa_header->range_buf_len = sizeof(hv_gpa_range) +
page_count * sizeof(uint64_t);
gpa_header->range[0].byte_offset = 0;
gpa_header->range[0].byte_count = size;
for (i = 0; i < page_count; i++) {
gpa_header->range[0].pfn_array[i] = pfn + i;
}
*msg_info = msg_header;
*message_count = 1;
}
return (0);
}
/**
* @brief Establish a GPADL for the specified buffer
*/
int
hv_vmbus_channel_establish_gpadl(
hv_vmbus_channel* channel,
void* contig_buffer,
uint32_t size, /* page-size multiple */
uint32_t* gpadl_handle)
{
int ret = 0;
hv_vmbus_channel_gpadl_header* gpadl_msg;
hv_vmbus_channel_gpadl_body* gpadl_body;
hv_vmbus_channel_msg_info* msg_info;
hv_vmbus_channel_msg_info* sub_msg_info;
uint32_t msg_count;
hv_vmbus_channel_msg_info* curr;
uint32_t next_gpadl_handle;
next_gpadl_handle = atomic_fetchadd_int(
&hv_vmbus_g_connection.next_gpadl_handle, 1);
ret = vmbus_channel_create_gpadl_header(
contig_buffer, size, &msg_info, &msg_count);
if(ret != 0) {
/*
* XXX
* We can _not_ even revert the above incremental,
* if multiple GPADL establishments are running
* parallelly, decrement the global next_gpadl_handle
* is calling for _big_ trouble. A better solution
* is to have a 0-based GPADL id bitmap ...
*/
return ret;
}
sema_init(&msg_info->wait_sema, 0, "Open Info Sema");
gpadl_msg = (hv_vmbus_channel_gpadl_header*) msg_info->msg;
gpadl_msg->header.message_type = HV_CHANNEL_MESSAGEL_GPADL_HEADER;
gpadl_msg->child_rel_id = channel->offer_msg.child_rel_id;
gpadl_msg->gpadl = next_gpadl_handle;
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_INSERT_TAIL(
&hv_vmbus_g_connection.channel_msg_anchor,
msg_info,
msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
ret = hv_vmbus_post_message(
gpadl_msg,
msg_info->message_size -
(uint32_t) sizeof(hv_vmbus_channel_msg_info));
if (ret != 0)
goto cleanup;
if (msg_count > 1) {
TAILQ_FOREACH(curr,
&msg_info->sub_msg_list_anchor, msg_list_entry) {
sub_msg_info = curr;
gpadl_body =
(hv_vmbus_channel_gpadl_body*) sub_msg_info->msg;
gpadl_body->header.message_type =
HV_CHANNEL_MESSAGE_GPADL_BODY;
gpadl_body->gpadl = next_gpadl_handle;
ret = hv_vmbus_post_message(
gpadl_body,
sub_msg_info->message_size
- (uint32_t) sizeof(hv_vmbus_channel_msg_info));
/* if (the post message failed) give up and clean up */
if(ret != 0)
goto cleanup;
}
}
ret = sema_timedwait(&msg_info->wait_sema, 5 * hz); /* KYS 5 seconds*/
if (ret != 0)
goto cleanup;
*gpadl_handle = gpadl_msg->gpadl;
cleanup:
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor,
msg_info, msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
sema_destroy(&msg_info->wait_sema);
free(msg_info, M_DEVBUF);
return (ret);
}
/**
* @brief Teardown the specified GPADL handle
*/
int
hv_vmbus_channel_teardown_gpdal(
hv_vmbus_channel* channel,
uint32_t gpadl_handle)
{
int ret = 0;
hv_vmbus_channel_gpadl_teardown* msg;
hv_vmbus_channel_msg_info* info;
info = (hv_vmbus_channel_msg_info *)
malloc( sizeof(hv_vmbus_channel_msg_info) +
sizeof(hv_vmbus_channel_gpadl_teardown),
M_DEVBUF, M_NOWAIT);
KASSERT(info != NULL,
("Error VMBUS: malloc failed to allocate Gpadl Teardown Msg!"));
if (info == NULL) {
ret = ENOMEM;
goto cleanup;
}
sema_init(&info->wait_sema, 0, "Open Info Sema");
msg = (hv_vmbus_channel_gpadl_teardown*) info->msg;
msg->header.message_type = HV_CHANNEL_MESSAGE_GPADL_TEARDOWN;
msg->child_rel_id = channel->offer_msg.child_rel_id;
msg->gpadl = gpadl_handle;
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_INSERT_TAIL(&hv_vmbus_g_connection.channel_msg_anchor,
info, msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
ret = hv_vmbus_post_message(msg,
sizeof(hv_vmbus_channel_gpadl_teardown));
if (ret != 0)
goto cleanup;
ret = sema_timedwait(&info->wait_sema, 5 * hz); /* KYS 5 seconds */
cleanup:
/*
* Received a torndown response
*/
mtx_lock(&hv_vmbus_g_connection.channel_msg_lock);
TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor,
info, msg_list_entry);
mtx_unlock(&hv_vmbus_g_connection.channel_msg_lock);
sema_destroy(&info->wait_sema);
free(info, M_DEVBUF);
return (ret);
}
static void
hv_vmbus_channel_close_internal(hv_vmbus_channel *channel)
{
int ret = 0;
struct taskqueue *rxq = channel->rxq;
hv_vmbus_channel_close_channel* msg;
hv_vmbus_channel_msg_info* info;
channel->state = HV_CHANNEL_OPEN_STATE;
/*
* set rxq to NULL to avoid more requests be scheduled
*/
channel->rxq = NULL;
taskqueue_drain(rxq, &channel->channel_task);
channel->on_channel_callback = NULL;
/**
* Send a closing message
*/
info = (hv_vmbus_channel_msg_info *)
malloc( sizeof(hv_vmbus_channel_msg_info) +
sizeof(hv_vmbus_channel_close_channel),
M_DEVBUF, M_NOWAIT);
KASSERT(info != NULL, ("VMBUS: malloc failed hv_vmbus_channel_close!"));
if(info == NULL)
return;
msg = (hv_vmbus_channel_close_channel*) info->msg;
msg->header.message_type = HV_CHANNEL_MESSAGE_CLOSE_CHANNEL;
msg->child_rel_id = channel->offer_msg.child_rel_id;
ret = hv_vmbus_post_message(
msg, sizeof(hv_vmbus_channel_close_channel));
/* Tear down the gpadl for the channel's ring buffer */
if (channel->ring_buffer_gpadl_handle) {
hv_vmbus_channel_teardown_gpdal(channel,
channel->ring_buffer_gpadl_handle);
}
/* TODO: Send a msg to release the childRelId */
/* cleanup the ring buffers for this channel */
hv_ring_buffer_cleanup(&channel->outbound);
hv_ring_buffer_cleanup(&channel->inbound);
contigfree(channel->ring_buffer_pages, channel->ring_buffer_size,
M_DEVBUF);
free(info, M_DEVBUF);
}
/**
* @brief Close the specified channel
*/
void
hv_vmbus_channel_close(hv_vmbus_channel *channel)
{
hv_vmbus_channel* sub_channel;
if (channel->primary_channel != NULL) {
/*
* We only close multi-channels when the primary is
* closed.
*/
return;
}
/*
* Close all multi-channels first.
*/
TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor,
sc_list_entry) {
if (sub_channel->state != HV_CHANNEL_OPENED_STATE)
continue;
hv_vmbus_channel_close_internal(sub_channel);
}
/*
* Then close the primary channel.
*/
hv_vmbus_channel_close_internal(channel);
}
/**
* @brief Send the specified buffer on the given channel
*/
int
hv_vmbus_channel_send_packet(
hv_vmbus_channel* channel,
void* buffer,
uint32_t buffer_len,
uint64_t request_id,
hv_vmbus_packet_type type,
uint32_t flags)
{
int ret = 0;
hv_vm_packet_descriptor desc;
uint32_t packet_len;
uint64_t aligned_data;
uint32_t packet_len_aligned;
boolean_t need_sig;
hv_vmbus_sg_buffer_list buffer_list[3];
packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len;
packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t));
aligned_data = 0;
/* Setup the descriptor */
desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */
desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */
/* in 8-bytes granularity */
desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3;
desc.length8 = (uint16_t) (packet_len_aligned >> 3);
desc.transaction_id = request_id;
buffer_list[0].data = &desc;
buffer_list[0].length = sizeof(hv_vm_packet_descriptor);
buffer_list[1].data = buffer;
buffer_list[1].length = buffer_len;
buffer_list[2].data = &aligned_data;
buffer_list[2].length = packet_len_aligned - packet_len;
ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3,
&need_sig);
/* TODO: We should determine if this is optional */
if (ret == 0 && need_sig) {
vmbus_channel_set_event(channel);
}
return (ret);
}
/**
* @brief Send a range of single-page buffer packets using
* a GPADL Direct packet type
*/
int
hv_vmbus_channel_send_packet_pagebuffer(
hv_vmbus_channel* channel,
hv_vmbus_page_buffer page_buffers[],
uint32_t page_count,
void* buffer,
uint32_t buffer_len,
uint64_t request_id)
{
int ret = 0;
boolean_t need_sig;
uint32_t packet_len;
uint32_t page_buflen;
uint32_t packetLen_aligned;
hv_vmbus_sg_buffer_list buffer_list[4];
hv_vmbus_channel_packet_page_buffer desc;
uint32_t descSize;
uint64_t alignedData = 0;
if (page_count > HV_MAX_PAGE_BUFFER_COUNT)
return (EINVAL);
/*
* Adjust the size down since hv_vmbus_channel_packet_page_buffer
* is the largest size we support
*/
descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range);
page_buflen = sizeof(hv_vmbus_page_buffer) * page_count;
packet_len = descSize + page_buflen + buffer_len;
packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t));
/* Setup the descriptor */
desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT;
desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
/* in 8-bytes granularity */
desc.data_offset8 = (descSize + page_buflen) >> 3;
desc.length8 = (uint16_t) (packetLen_aligned >> 3);
desc.transaction_id = request_id;
desc.range_count = page_count;
buffer_list[0].data = &desc;
buffer_list[0].length = descSize;
buffer_list[1].data = page_buffers;
buffer_list[1].length = page_buflen;
buffer_list[2].data = buffer;
buffer_list[2].length = buffer_len;
buffer_list[3].data = &alignedData;
buffer_list[3].length = packetLen_aligned - packet_len;
ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4,
&need_sig);
/* TODO: We should determine if this is optional */
if (ret == 0 && need_sig) {
vmbus_channel_set_event(channel);
}
return (ret);
}
/**
* @brief Send a multi-page buffer packet using a GPADL Direct packet type
*/
int
hv_vmbus_channel_send_packet_multipagebuffer(
hv_vmbus_channel* channel,
hv_vmbus_multipage_buffer* multi_page_buffer,
void* buffer,
uint32_t buffer_len,
uint64_t request_id)
{
int ret = 0;
uint32_t desc_size;
boolean_t need_sig;
uint32_t packet_len;
uint32_t packet_len_aligned;
uint32_t pfn_count;
uint64_t aligned_data = 0;
hv_vmbus_sg_buffer_list buffer_list[3];
hv_vmbus_channel_packet_multipage_buffer desc;
pfn_count =
HV_NUM_PAGES_SPANNED(
multi_page_buffer->offset,
multi_page_buffer->length);
if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT))
return (EINVAL);
/*
* Adjust the size down since hv_vmbus_channel_packet_multipage_buffer
* is the largest size we support
*/
desc_size =
sizeof(hv_vmbus_channel_packet_multipage_buffer) -
((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) *
sizeof(uint64_t));
packet_len = desc_size + buffer_len;
packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t));
/*
* Setup the descriptor
*/
desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT;
desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */
desc.length8 = (uint16_t) (packet_len_aligned >> 3);
desc.transaction_id = request_id;
desc.range_count = 1;
desc.range.length = multi_page_buffer->length;
desc.range.offset = multi_page_buffer->offset;
memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array,
pfn_count * sizeof(uint64_t));
buffer_list[0].data = &desc;
buffer_list[0].length = desc_size;
buffer_list[1].data = buffer;
buffer_list[1].length = buffer_len;
buffer_list[2].data = &aligned_data;
buffer_list[2].length = packet_len_aligned - packet_len;
ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3,
&need_sig);
/* TODO: We should determine if this is optional */
if (ret == 0 && need_sig) {
vmbus_channel_set_event(channel);
}
return (ret);
}
/**
* @brief Retrieve the user packet on the specified channel
*/
int
hv_vmbus_channel_recv_packet(
hv_vmbus_channel* channel,
void* Buffer,
uint32_t buffer_len,
uint32_t* buffer_actual_len,
uint64_t* request_id)
{
int ret;
uint32_t user_len;
uint32_t packet_len;
hv_vm_packet_descriptor desc;
*buffer_actual_len = 0;
*request_id = 0;
ret = hv_ring_buffer_peek(&channel->inbound, &desc,
sizeof(hv_vm_packet_descriptor));
if (ret != 0)
return (0);
packet_len = desc.length8 << 3;
user_len = packet_len - (desc.data_offset8 << 3);
*buffer_actual_len = user_len;
if (user_len > buffer_len)
return (EINVAL);
*request_id = desc.transaction_id;
/* Copy over the packet to the user buffer */
ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len,
(desc.data_offset8 << 3));
return (0);
}
/**
* @brief Retrieve the raw packet on the specified channel
*/
int
hv_vmbus_channel_recv_packet_raw(
hv_vmbus_channel* channel,
void* buffer,
uint32_t buffer_len,
uint32_t* buffer_actual_len,
uint64_t* request_id)
{
int ret;
uint32_t packetLen;
hv_vm_packet_descriptor desc;
*buffer_actual_len = 0;
*request_id = 0;
ret = hv_ring_buffer_peek(
&channel->inbound, &desc,
sizeof(hv_vm_packet_descriptor));
if (ret != 0)
return (0);
packetLen = desc.length8 << 3;
*buffer_actual_len = packetLen;
if (packetLen > buffer_len)
return (ENOBUFS);
*request_id = desc.transaction_id;
/* Copy over the entire packet to the user buffer */
ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0);
return (0);
}
/**
* Process a channel event notification
*/
static void
VmbusProcessChannelEvent(void* context, int pending)
{
void* arg;
uint32_t bytes_to_read;
hv_vmbus_channel* channel = (hv_vmbus_channel*)context;
boolean_t is_batched_reading;
/**
* Find the channel based on this relid and invokes
* the channel callback to process the event
*/
if (channel == NULL) {
return;
}
/**
* To deal with the race condition where we might
* receive a packet while the relevant driver is
* being unloaded, dispatch the callback while
* holding the channel lock. The unloading driver
* will acquire the same channel lock to set the
* callback to NULL. This closes the window.
*/
if (channel->on_channel_callback != NULL) {
arg = channel->channel_callback_context;
is_batched_reading = channel->batched_reading;
/*
* Optimize host to guest signaling by ensuring:
* 1. While reading the channel, we disable interrupts from
* host.
* 2. Ensure that we process all posted messages from the host
* before returning from this callback.
* 3. Once we return, enable signaling from the host. Once this
* state is set we check to see if additional packets are
* available to read. In this case we repeat the process.
*/
do {
if (is_batched_reading)
hv_ring_buffer_read_begin(&channel->inbound);
channel->on_channel_callback(arg);
if (is_batched_reading)
bytes_to_read =
hv_ring_buffer_read_end(&channel->inbound);
else
bytes_to_read = 0;
} while (is_batched_reading && (bytes_to_read != 0));
}
}
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