![Greg Kroah-Hartman](/assets/img/avatar_default.png)
This brings in the various 3.7-rc3 char fixes into char-misc-next. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
810 lines
22 KiB
C
810 lines
22 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/hyperv.h>
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#include "hyperv_vmbus.h"
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#define NUM_PAGES_SPANNED(addr, len) \
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((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
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/*
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* vmbus_setevent- Trigger an event notification on the specified
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* channel.
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*/
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static void vmbus_setevent(struct vmbus_channel *channel)
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{
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struct hv_monitor_page *monitorpage;
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if (channel->offermsg.monitor_allocated) {
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/* Each u32 represents 32 channels */
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sync_set_bit(channel->offermsg.child_relid & 31,
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(unsigned long *) vmbus_connection.send_int_page +
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(channel->offermsg.child_relid >> 5));
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monitorpage = vmbus_connection.monitor_pages;
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monitorpage++; /* Get the child to parent monitor page */
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sync_set_bit(channel->monitor_bit,
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(unsigned long *)&monitorpage->trigger_group
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[channel->monitor_grp].pending);
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} else {
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vmbus_set_event(channel->offermsg.child_relid);
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}
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}
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/*
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* vmbus_get_debug_info -Retrieve various channel debug info
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*/
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void vmbus_get_debug_info(struct vmbus_channel *channel,
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struct vmbus_channel_debug_info *debuginfo)
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{
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struct hv_monitor_page *monitorpage;
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u8 monitor_group = (u8)channel->offermsg.monitorid / 32;
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u8 monitor_offset = (u8)channel->offermsg.monitorid % 32;
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debuginfo->relid = channel->offermsg.child_relid;
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debuginfo->state = channel->state;
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memcpy(&debuginfo->interfacetype,
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&channel->offermsg.offer.if_type, sizeof(uuid_le));
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memcpy(&debuginfo->interface_instance,
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&channel->offermsg.offer.if_instance,
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sizeof(uuid_le));
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monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages;
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debuginfo->monitorid = channel->offermsg.monitorid;
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debuginfo->servermonitor_pending =
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monitorpage->trigger_group[monitor_group].pending;
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debuginfo->servermonitor_latency =
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monitorpage->latency[monitor_group][monitor_offset];
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debuginfo->servermonitor_connectionid =
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monitorpage->parameter[monitor_group]
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[monitor_offset].connectionid.u.id;
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monitorpage++;
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debuginfo->clientmonitor_pending =
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monitorpage->trigger_group[monitor_group].pending;
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debuginfo->clientmonitor_latency =
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monitorpage->latency[monitor_group][monitor_offset];
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debuginfo->clientmonitor_connectionid =
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monitorpage->parameter[monitor_group]
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[monitor_offset].connectionid.u.id;
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hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound);
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hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound);
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}
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/*
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* vmbus_open - Open the specified channel.
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*/
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int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
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u32 recv_ringbuffer_size, void *userdata, u32 userdatalen,
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void (*onchannelcallback)(void *context), void *context)
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{
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struct vmbus_channel_open_channel *open_msg;
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struct vmbus_channel_msginfo *open_info = NULL;
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void *in, *out;
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unsigned long flags;
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int ret, t, err = 0;
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newchannel->onchannel_callback = onchannelcallback;
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newchannel->channel_callback_context = context;
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/* Allocate the ring buffer */
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out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
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get_order(send_ringbuffer_size + recv_ringbuffer_size));
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if (!out)
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return -ENOMEM;
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in = (void *)((unsigned long)out + send_ringbuffer_size);
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newchannel->ringbuffer_pages = out;
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newchannel->ringbuffer_pagecount = (send_ringbuffer_size +
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recv_ringbuffer_size) >> PAGE_SHIFT;
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ret = hv_ringbuffer_init(
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&newchannel->outbound, out, send_ringbuffer_size);
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if (ret != 0) {
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err = ret;
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goto error0;
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}
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ret = hv_ringbuffer_init(
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&newchannel->inbound, in, recv_ringbuffer_size);
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if (ret != 0) {
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err = ret;
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goto error0;
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}
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/* Establish the gpadl for the ring buffer */
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newchannel->ringbuffer_gpadlhandle = 0;
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ret = vmbus_establish_gpadl(newchannel,
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newchannel->outbound.ring_buffer,
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send_ringbuffer_size +
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recv_ringbuffer_size,
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&newchannel->ringbuffer_gpadlhandle);
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if (ret != 0) {
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err = ret;
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goto error0;
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}
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/* Create and init the channel open message */
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open_info = kmalloc(sizeof(*open_info) +
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sizeof(struct vmbus_channel_open_channel),
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GFP_KERNEL);
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if (!open_info) {
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err = -ENOMEM;
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goto error0;
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}
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init_completion(&open_info->waitevent);
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open_msg = (struct vmbus_channel_open_channel *)open_info->msg;
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open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL;
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open_msg->openid = newchannel->offermsg.child_relid;
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open_msg->child_relid = newchannel->offermsg.child_relid;
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open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
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open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >>
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PAGE_SHIFT;
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open_msg->server_contextarea_gpadlhandle = 0;
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if (userdatalen > MAX_USER_DEFINED_BYTES) {
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err = -EINVAL;
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goto error0;
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}
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if (userdatalen)
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memcpy(open_msg->userdata, userdata, userdatalen);
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_add_tail(&open_info->msglistentry,
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&vmbus_connection.chn_msg_list);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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ret = vmbus_post_msg(open_msg,
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sizeof(struct vmbus_channel_open_channel));
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if (ret != 0)
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goto error1;
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t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ);
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if (t == 0) {
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err = -ETIMEDOUT;
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goto error1;
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}
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if (open_info->response.open_result.status)
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err = open_info->response.open_result.status;
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_del(&open_info->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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kfree(open_info);
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return err;
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error1:
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_del(&open_info->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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error0:
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free_pages((unsigned long)out,
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get_order(send_ringbuffer_size + recv_ringbuffer_size));
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kfree(open_info);
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return err;
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}
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EXPORT_SYMBOL_GPL(vmbus_open);
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/*
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* create_gpadl_header - Creates a gpadl for the specified buffer
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*/
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static int create_gpadl_header(void *kbuffer, u32 size,
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struct vmbus_channel_msginfo **msginfo,
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u32 *messagecount)
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{
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int i;
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int pagecount;
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unsigned long long pfn;
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struct vmbus_channel_gpadl_header *gpadl_header;
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struct vmbus_channel_gpadl_body *gpadl_body;
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struct vmbus_channel_msginfo *msgheader;
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struct vmbus_channel_msginfo *msgbody = NULL;
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u32 msgsize;
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int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
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pagecount = size >> PAGE_SHIFT;
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pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT;
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/* do we need a gpadl body msg */
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pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
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sizeof(struct vmbus_channel_gpadl_header) -
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sizeof(struct gpa_range);
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pfncount = pfnsize / sizeof(u64);
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if (pagecount > pfncount) {
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/* we need a gpadl body */
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/* fill in the header */
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msgsize = sizeof(struct vmbus_channel_msginfo) +
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sizeof(struct vmbus_channel_gpadl_header) +
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sizeof(struct gpa_range) + pfncount * sizeof(u64);
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msgheader = kzalloc(msgsize, GFP_KERNEL);
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if (!msgheader)
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goto nomem;
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INIT_LIST_HEAD(&msgheader->submsglist);
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msgheader->msgsize = msgsize;
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gpadl_header = (struct vmbus_channel_gpadl_header *)
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msgheader->msg;
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gpadl_header->rangecount = 1;
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gpadl_header->range_buflen = sizeof(struct gpa_range) +
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pagecount * sizeof(u64);
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gpadl_header->range[0].byte_offset = 0;
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gpadl_header->range[0].byte_count = size;
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for (i = 0; i < pfncount; i++)
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gpadl_header->range[0].pfn_array[i] = pfn+i;
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*msginfo = msgheader;
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*messagecount = 1;
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pfnsum = pfncount;
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pfnleft = pagecount - pfncount;
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/* how many pfns can we fit */
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pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
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sizeof(struct vmbus_channel_gpadl_body);
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pfncount = pfnsize / sizeof(u64);
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/* fill in the body */
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while (pfnleft) {
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if (pfnleft > pfncount)
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pfncurr = pfncount;
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else
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pfncurr = pfnleft;
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msgsize = sizeof(struct vmbus_channel_msginfo) +
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sizeof(struct vmbus_channel_gpadl_body) +
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pfncurr * sizeof(u64);
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msgbody = kzalloc(msgsize, GFP_KERNEL);
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if (!msgbody) {
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struct vmbus_channel_msginfo *pos = NULL;
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struct vmbus_channel_msginfo *tmp = NULL;
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/*
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* Free up all the allocated messages.
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*/
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list_for_each_entry_safe(pos, tmp,
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&msgheader->submsglist,
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msglistentry) {
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list_del(&pos->msglistentry);
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kfree(pos);
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}
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goto nomem;
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}
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msgbody->msgsize = msgsize;
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(*messagecount)++;
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gpadl_body =
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(struct vmbus_channel_gpadl_body *)msgbody->msg;
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/*
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* Gpadl is u32 and we are using a pointer which could
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* be 64-bit
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* This is governed by the guest/host protocol and
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* so the hypervisor gurantees that this is ok.
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*/
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for (i = 0; i < pfncurr; i++)
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gpadl_body->pfn[i] = pfn + pfnsum + i;
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/* add to msg header */
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list_add_tail(&msgbody->msglistentry,
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&msgheader->submsglist);
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pfnsum += pfncurr;
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pfnleft -= pfncurr;
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}
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} else {
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/* everything fits in a header */
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msgsize = sizeof(struct vmbus_channel_msginfo) +
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sizeof(struct vmbus_channel_gpadl_header) +
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sizeof(struct gpa_range) + pagecount * sizeof(u64);
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msgheader = kzalloc(msgsize, GFP_KERNEL);
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if (msgheader == NULL)
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goto nomem;
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msgheader->msgsize = msgsize;
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gpadl_header = (struct vmbus_channel_gpadl_header *)
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msgheader->msg;
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gpadl_header->rangecount = 1;
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gpadl_header->range_buflen = sizeof(struct gpa_range) +
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pagecount * sizeof(u64);
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gpadl_header->range[0].byte_offset = 0;
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gpadl_header->range[0].byte_count = size;
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for (i = 0; i < pagecount; i++)
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gpadl_header->range[0].pfn_array[i] = pfn+i;
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*msginfo = msgheader;
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*messagecount = 1;
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}
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return 0;
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nomem:
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kfree(msgheader);
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kfree(msgbody);
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return -ENOMEM;
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}
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/*
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* vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
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*
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* @channel: a channel
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* @kbuffer: from kmalloc
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* @size: page-size multiple
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* @gpadl_handle: some funky thing
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*/
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int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
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u32 size, u32 *gpadl_handle)
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{
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struct vmbus_channel_gpadl_header *gpadlmsg;
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struct vmbus_channel_gpadl_body *gpadl_body;
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struct vmbus_channel_msginfo *msginfo = NULL;
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struct vmbus_channel_msginfo *submsginfo;
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u32 msgcount;
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struct list_head *curr;
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u32 next_gpadl_handle;
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unsigned long flags;
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int ret = 0;
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int t;
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next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle);
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atomic_inc(&vmbus_connection.next_gpadl_handle);
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ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
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if (ret)
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return ret;
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init_completion(&msginfo->waitevent);
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gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
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gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
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gpadlmsg->child_relid = channel->offermsg.child_relid;
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gpadlmsg->gpadl = next_gpadl_handle;
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_add_tail(&msginfo->msglistentry,
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&vmbus_connection.chn_msg_list);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
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sizeof(*msginfo));
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if (ret != 0)
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goto cleanup;
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if (msgcount > 1) {
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list_for_each(curr, &msginfo->submsglist) {
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submsginfo = (struct vmbus_channel_msginfo *)curr;
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gpadl_body =
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(struct vmbus_channel_gpadl_body *)submsginfo->msg;
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gpadl_body->header.msgtype =
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CHANNELMSG_GPADL_BODY;
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gpadl_body->gpadl = next_gpadl_handle;
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ret = vmbus_post_msg(gpadl_body,
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submsginfo->msgsize -
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sizeof(*submsginfo));
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if (ret != 0)
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goto cleanup;
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}
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}
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t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
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BUG_ON(t == 0);
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/* At this point, we received the gpadl created msg */
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*gpadl_handle = gpadlmsg->gpadl;
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cleanup:
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_del(&msginfo->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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kfree(msginfo);
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return ret;
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}
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EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
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/*
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* vmbus_teardown_gpadl -Teardown the specified GPADL handle
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*/
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int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
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{
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struct vmbus_channel_gpadl_teardown *msg;
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struct vmbus_channel_msginfo *info;
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unsigned long flags;
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int ret, t;
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info = kmalloc(sizeof(*info) +
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sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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init_completion(&info->waitevent);
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msg = (struct vmbus_channel_gpadl_teardown *)info->msg;
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msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
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msg->child_relid = channel->offermsg.child_relid;
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msg->gpadl = gpadl_handle;
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_add_tail(&info->msglistentry,
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&vmbus_connection.chn_msg_list);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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ret = vmbus_post_msg(msg,
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sizeof(struct vmbus_channel_gpadl_teardown));
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BUG_ON(ret != 0);
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t = wait_for_completion_timeout(&info->waitevent, 5*HZ);
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BUG_ON(t == 0);
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/* Received a torndown response */
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
list_del(&info->msglistentry);
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
kfree(info);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
|
|
|
|
/*
|
|
* vmbus_close - Close the specified channel
|
|
*/
|
|
void vmbus_close(struct vmbus_channel *channel)
|
|
{
|
|
struct vmbus_channel_close_channel *msg;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
/* Stop callback and cancel the timer asap */
|
|
spin_lock_irqsave(&channel->inbound_lock, flags);
|
|
channel->onchannel_callback = NULL;
|
|
spin_unlock_irqrestore(&channel->inbound_lock, flags);
|
|
|
|
/* Send a closing message */
|
|
|
|
msg = &channel->close_msg.msg;
|
|
|
|
msg->header.msgtype = CHANNELMSG_CLOSECHANNEL;
|
|
msg->child_relid = channel->offermsg.child_relid;
|
|
|
|
ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel));
|
|
|
|
BUG_ON(ret != 0);
|
|
/* Tear down the gpadl for the channel's ring buffer */
|
|
if (channel->ringbuffer_gpadlhandle)
|
|
vmbus_teardown_gpadl(channel,
|
|
channel->ringbuffer_gpadlhandle);
|
|
|
|
/* Cleanup the ring buffers for this channel */
|
|
hv_ringbuffer_cleanup(&channel->outbound);
|
|
hv_ringbuffer_cleanup(&channel->inbound);
|
|
|
|
free_pages((unsigned long)channel->ringbuffer_pages,
|
|
get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
|
|
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_close);
|
|
|
|
/**
|
|
* vmbus_sendpacket() - Send the specified buffer on the given channel
|
|
* @channel: Pointer to vmbus_channel structure.
|
|
* @buffer: Pointer to the buffer you want to receive the data into.
|
|
* @bufferlen: Maximum size of what the the buffer will hold
|
|
* @requestid: Identifier of the request
|
|
* @type: Type of packet that is being send e.g. negotiate, time
|
|
* packet etc.
|
|
*
|
|
* Sends data in @buffer directly to hyper-v via the vmbus
|
|
* This will send the data unparsed to hyper-v.
|
|
*
|
|
* Mainly used by Hyper-V drivers.
|
|
*/
|
|
int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
|
|
u32 bufferlen, u64 requestid,
|
|
enum vmbus_packet_type type, u32 flags)
|
|
{
|
|
struct vmpacket_descriptor desc;
|
|
u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
|
|
u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
|
|
struct scatterlist bufferlist[3];
|
|
u64 aligned_data = 0;
|
|
int ret;
|
|
|
|
|
|
/* Setup the descriptor */
|
|
desc.type = type; /* VmbusPacketTypeDataInBand; */
|
|
desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
|
|
/* in 8-bytes granularity */
|
|
desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
|
|
desc.len8 = (u16)(packetlen_aligned >> 3);
|
|
desc.trans_id = requestid;
|
|
|
|
sg_init_table(bufferlist, 3);
|
|
sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor));
|
|
sg_set_buf(&bufferlist[1], buffer, bufferlen);
|
|
sg_set_buf(&bufferlist[2], &aligned_data,
|
|
packetlen_aligned - packetlen);
|
|
|
|
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
|
|
|
|
if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
|
|
vmbus_setevent(channel);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(vmbus_sendpacket);
|
|
|
|
/*
|
|
* vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
|
|
* packets using a GPADL Direct packet type.
|
|
*/
|
|
int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
|
|
struct hv_page_buffer pagebuffers[],
|
|
u32 pagecount, void *buffer, u32 bufferlen,
|
|
u64 requestid)
|
|
{
|
|
int ret;
|
|
int i;
|
|
struct vmbus_channel_packet_page_buffer desc;
|
|
u32 descsize;
|
|
u32 packetlen;
|
|
u32 packetlen_aligned;
|
|
struct scatterlist bufferlist[3];
|
|
u64 aligned_data = 0;
|
|
|
|
if (pagecount > MAX_PAGE_BUFFER_COUNT)
|
|
return -EINVAL;
|
|
|
|
|
|
/*
|
|
* Adjust the size down since vmbus_channel_packet_page_buffer is the
|
|
* largest size we support
|
|
*/
|
|
descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
|
|
((MAX_PAGE_BUFFER_COUNT - pagecount) *
|
|
sizeof(struct hv_page_buffer));
|
|
packetlen = descsize + bufferlen;
|
|
packetlen_aligned = ALIGN(packetlen, sizeof(u64));
|
|
|
|
/* Setup the descriptor */
|
|
desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
|
|
desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
|
|
desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
|
|
desc.length8 = (u16)(packetlen_aligned >> 3);
|
|
desc.transactionid = requestid;
|
|
desc.rangecount = pagecount;
|
|
|
|
for (i = 0; i < pagecount; i++) {
|
|
desc.range[i].len = pagebuffers[i].len;
|
|
desc.range[i].offset = pagebuffers[i].offset;
|
|
desc.range[i].pfn = pagebuffers[i].pfn;
|
|
}
|
|
|
|
sg_init_table(bufferlist, 3);
|
|
sg_set_buf(&bufferlist[0], &desc, descsize);
|
|
sg_set_buf(&bufferlist[1], buffer, bufferlen);
|
|
sg_set_buf(&bufferlist[2], &aligned_data,
|
|
packetlen_aligned - packetlen);
|
|
|
|
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
|
|
|
|
if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
|
|
vmbus_setevent(channel);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
|
|
|
|
/*
|
|
* vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
|
|
* using a GPADL Direct packet type.
|
|
*/
|
|
int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
|
|
struct hv_multipage_buffer *multi_pagebuffer,
|
|
void *buffer, u32 bufferlen, u64 requestid)
|
|
{
|
|
int ret;
|
|
struct vmbus_channel_packet_multipage_buffer desc;
|
|
u32 descsize;
|
|
u32 packetlen;
|
|
u32 packetlen_aligned;
|
|
struct scatterlist bufferlist[3];
|
|
u64 aligned_data = 0;
|
|
u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset,
|
|
multi_pagebuffer->len);
|
|
|
|
|
|
if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Adjust the size down since vmbus_channel_packet_multipage_buffer is
|
|
* the largest size we support
|
|
*/
|
|
descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) -
|
|
((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
|
|
sizeof(u64));
|
|
packetlen = descsize + bufferlen;
|
|
packetlen_aligned = ALIGN(packetlen, sizeof(u64));
|
|
|
|
|
|
/* Setup the descriptor */
|
|
desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
|
|
desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
|
|
desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
|
|
desc.length8 = (u16)(packetlen_aligned >> 3);
|
|
desc.transactionid = requestid;
|
|
desc.rangecount = 1;
|
|
|
|
desc.range.len = multi_pagebuffer->len;
|
|
desc.range.offset = multi_pagebuffer->offset;
|
|
|
|
memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array,
|
|
pfncount * sizeof(u64));
|
|
|
|
sg_init_table(bufferlist, 3);
|
|
sg_set_buf(&bufferlist[0], &desc, descsize);
|
|
sg_set_buf(&bufferlist[1], buffer, bufferlen);
|
|
sg_set_buf(&bufferlist[2], &aligned_data,
|
|
packetlen_aligned - packetlen);
|
|
|
|
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
|
|
|
|
if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
|
|
vmbus_setevent(channel);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
|
|
|
|
/**
|
|
* vmbus_recvpacket() - Retrieve the user packet on the specified channel
|
|
* @channel: Pointer to vmbus_channel structure.
|
|
* @buffer: Pointer to the buffer you want to receive the data into.
|
|
* @bufferlen: Maximum size of what the the buffer will hold
|
|
* @buffer_actual_len: The actual size of the data after it was received
|
|
* @requestid: Identifier of the request
|
|
*
|
|
* Receives directly from the hyper-v vmbus and puts the data it received
|
|
* into Buffer. This will receive the data unparsed from hyper-v.
|
|
*
|
|
* Mainly used by Hyper-V drivers.
|
|
*/
|
|
int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
|
|
u32 bufferlen, u32 *buffer_actual_len, u64 *requestid)
|
|
{
|
|
struct vmpacket_descriptor desc;
|
|
u32 packetlen;
|
|
u32 userlen;
|
|
int ret;
|
|
|
|
*buffer_actual_len = 0;
|
|
*requestid = 0;
|
|
|
|
|
|
ret = hv_ringbuffer_peek(&channel->inbound, &desc,
|
|
sizeof(struct vmpacket_descriptor));
|
|
if (ret != 0)
|
|
return 0;
|
|
|
|
packetlen = desc.len8 << 3;
|
|
userlen = packetlen - (desc.offset8 << 3);
|
|
|
|
*buffer_actual_len = userlen;
|
|
|
|
if (userlen > bufferlen) {
|
|
|
|
pr_err("Buffer too small - got %d needs %d\n",
|
|
bufferlen, userlen);
|
|
return -ETOOSMALL;
|
|
}
|
|
|
|
*requestid = desc.trans_id;
|
|
|
|
/* Copy over the packet to the user buffer */
|
|
ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen,
|
|
(desc.offset8 << 3));
|
|
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(vmbus_recvpacket);
|
|
|
|
/*
|
|
* vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
|
|
*/
|
|
int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
|
|
u32 bufferlen, u32 *buffer_actual_len,
|
|
u64 *requestid)
|
|
{
|
|
struct vmpacket_descriptor desc;
|
|
u32 packetlen;
|
|
u32 userlen;
|
|
int ret;
|
|
|
|
*buffer_actual_len = 0;
|
|
*requestid = 0;
|
|
|
|
|
|
ret = hv_ringbuffer_peek(&channel->inbound, &desc,
|
|
sizeof(struct vmpacket_descriptor));
|
|
if (ret != 0)
|
|
return 0;
|
|
|
|
|
|
packetlen = desc.len8 << 3;
|
|
userlen = packetlen - (desc.offset8 << 3);
|
|
|
|
*buffer_actual_len = packetlen;
|
|
|
|
if (packetlen > bufferlen) {
|
|
pr_err("Buffer too small - needed %d bytes but "
|
|
"got space for only %d bytes\n",
|
|
packetlen, bufferlen);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
*requestid = desc.trans_id;
|
|
|
|
/* Copy over the entire packet to the user buffer */
|
|
ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
|