diff options
Diffstat (limited to 'drivers/staging/hv/channel.c')
| -rw-r--r-- | drivers/staging/hv/channel.c | 1057 |
1 files changed, 0 insertions, 1057 deletions
diff --git a/drivers/staging/hv/channel.c b/drivers/staging/hv/channel.c deleted file mode 100644 index 26ebc77f22b..00000000000 --- a/drivers/staging/hv/channel.c +++ /dev/null @@ -1,1057 +0,0 @@ -/* - * Copyright (c) 2009, Microsoft Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 Temple - * Place - Suite 330, Boston, MA 02111-1307 USA. - * - * Authors: - * Haiyang Zhang <haiyangz@microsoft.com> - * Hank Janssen <hjanssen@microsoft.com> - */ -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/module.h> -#include "osd.h" -#include "logging.h" -#include "vmbus_private.h" - -/* Internal routines */ -static int create_gpadl_header( - void *kbuffer, /* must be phys and virt contiguous */ - u32 size, /* page-size multiple */ - struct vmbus_channel_msginfo **msginfo, - u32 *messagecount); -static void dump_vmbus_channel(struct vmbus_channel *channel); -static void vmbus_setevent(struct vmbus_channel *channel); - - -#if 0 -static void DumpMonitorPage(struct hv_monitor_page *MonitorPage) -{ - int i = 0; - int j = 0; - - DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d", - MonitorPage, MonitorPage->TriggerState); - - for (i = 0; i < 4; i++) - DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i, - MonitorPage->TriggerGroup[i].AsUINT64); - - for (i = 0; i < 4; i++) { - for (j = 0; j < 32; j++) { - DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j, - MonitorPage->Latency[i][j]); - } - } - for (i = 0; i < 4; i++) { - for (j = 0; j < 32; j++) { - DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j, - MonitorPage->Parameter[i][j].ConnectionId.Asu32); - DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j, - MonitorPage->Parameter[i][j].FlagNumber); - } - } -} -#endif - -/* - * vmbus_setevent- Trigger an event notification on the specified - * channel. - */ -static void vmbus_setevent(struct vmbus_channel *channel) -{ - struct hv_monitor_page *monitorpage; - - if (channel->OfferMsg.MonitorAllocated) { - /* Each u32 represents 32 channels */ - set_bit(channel->OfferMsg.ChildRelId & 31, - (unsigned long *) gVmbusConnection.SendInterruptPage + - (channel->OfferMsg.ChildRelId >> 5)); - - monitorpage = gVmbusConnection.MonitorPages; - monitorpage++; /* Get the child to parent monitor page */ - - set_bit(channel->MonitorBit, - (unsigned long *)&monitorpage->TriggerGroup - [channel->MonitorGroup].Pending); - - } else { - VmbusSetEvent(channel->OfferMsg.ChildRelId); - } -} - -#if 0 -static void VmbusChannelClearEvent(struct vmbus_channel *channel) -{ - struct hv_monitor_page *monitorPage; - - if (Channel->OfferMsg.MonitorAllocated) { - /* Each u32 represents 32 channels */ - clear_bit(Channel->OfferMsg.ChildRelId & 31, - (unsigned long *)gVmbusConnection.SendInterruptPage + - (Channel->OfferMsg.ChildRelId >> 5)); - - monitorPage = - (struct hv_monitor_page *)gVmbusConnection.MonitorPages; - monitorPage++; /* Get the child to parent monitor page */ - - clear_bit(Channel->MonitorBit, - (unsigned long *)&monitorPage->TriggerGroup - [Channel->MonitorGroup].Pending); - } -} - -#endif -/* - * vmbus_get_debug_info -Retrieve various channel debug info - */ -void vmbus_get_debug_info(struct vmbus_channel *channel, - struct vmbus_channel_debug_info *debuginfo) -{ - struct hv_monitor_page *monitorpage; - u8 monitor_group = (u8)channel->OfferMsg.MonitorId / 32; - u8 monitor_offset = (u8)channel->OfferMsg.MonitorId % 32; - /* u32 monitorBit = 1 << monitorOffset; */ - - debuginfo->RelId = channel->OfferMsg.ChildRelId; - debuginfo->State = channel->State; - memcpy(&debuginfo->InterfaceType, - &channel->OfferMsg.Offer.InterfaceType, sizeof(struct hv_guid)); - memcpy(&debuginfo->InterfaceInstance, - &channel->OfferMsg.Offer.InterfaceInstance, - sizeof(struct hv_guid)); - - monitorpage = (struct hv_monitor_page *)gVmbusConnection.MonitorPages; - - debuginfo->MonitorId = channel->OfferMsg.MonitorId; - - debuginfo->ServerMonitorPending = - monitorpage->TriggerGroup[monitor_group].Pending; - debuginfo->ServerMonitorLatency = - monitorpage->Latency[monitor_group][monitor_offset]; - debuginfo->ServerMonitorConnectionId = - monitorpage->Parameter[monitor_group] - [monitor_offset].ConnectionId.u.Id; - - monitorpage++; - - debuginfo->ClientMonitorPending = - monitorpage->TriggerGroup[monitor_group].Pending; - debuginfo->ClientMonitorLatency = - monitorpage->Latency[monitor_group][monitor_offset]; - debuginfo->ClientMonitorConnectionId = - monitorpage->Parameter[monitor_group] - [monitor_offset].ConnectionId.u.Id; - - RingBufferGetDebugInfo(&channel->Inbound, &debuginfo->Inbound); - RingBufferGetDebugInfo(&channel->Outbound, &debuginfo->Outbound); -} - -/* - * vmbus_open - Open the specified channel. - */ -int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, - u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, - void (*onchannelcallback)(void *context), void *context) -{ - struct vmbus_channel_open_channel *openMsg; - struct vmbus_channel_msginfo *openInfo = NULL; - void *in, *out; - unsigned long flags; - int ret, err = 0; - - /* Aligned to page size */ - /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */ - /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */ - - newchannel->OnChannelCallback = onchannelcallback; - newchannel->ChannelCallbackContext = context; - - /* Allocate the ring buffer */ - out = osd_PageAlloc((send_ringbuffer_size + recv_ringbuffer_size) - >> PAGE_SHIFT); - if (!out) - return -ENOMEM; - - /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */ - - in = (void *)((unsigned long)out + send_ringbuffer_size); - - newchannel->RingBufferPages = out; - newchannel->RingBufferPageCount = (send_ringbuffer_size + - recv_ringbuffer_size) >> PAGE_SHIFT; - - ret = RingBufferInit(&newchannel->Outbound, out, send_ringbuffer_size); - if (ret != 0) { - err = ret; - goto errorout; - } - - ret = RingBufferInit(&newchannel->Inbound, in, recv_ringbuffer_size); - if (ret != 0) { - err = ret; - goto errorout; - } - - - /* Establish the gpadl for the ring buffer */ - DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...", - newchannel); - - newchannel->RingBufferGpadlHandle = 0; - - ret = vmbus_establish_gpadl(newchannel, - newchannel->Outbound.RingBuffer, - send_ringbuffer_size + - recv_ringbuffer_size, - &newchannel->RingBufferGpadlHandle); - - if (ret != 0) { - err = ret; - goto errorout; - } - - DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p " - "size %d recv ring %p size %d, downstreamoffset %d>", - newchannel, newchannel->OfferMsg.ChildRelId, - newchannel->RingBufferGpadlHandle, - newchannel->Outbound.RingBuffer, - newchannel->Outbound.RingSize, - newchannel->Inbound.RingBuffer, - newchannel->Inbound.RingSize, - send_ringbuffer_size); - - /* Create and init the channel open message */ - openInfo = kmalloc(sizeof(*openInfo) + - sizeof(struct vmbus_channel_open_channel), - GFP_KERNEL); - if (!openInfo) { - err = -ENOMEM; - goto errorout; - } - - openInfo->WaitEvent = osd_WaitEventCreate(); - if (!openInfo->WaitEvent) { - err = -ENOMEM; - goto errorout; - } - - openMsg = (struct vmbus_channel_open_channel *)openInfo->Msg; - openMsg->Header.MessageType = ChannelMessageOpenChannel; - openMsg->OpenId = newchannel->OfferMsg.ChildRelId; /* FIXME */ - openMsg->ChildRelId = newchannel->OfferMsg.ChildRelId; - openMsg->RingBufferGpadlHandle = newchannel->RingBufferGpadlHandle; - openMsg->DownstreamRingBufferPageOffset = send_ringbuffer_size >> - PAGE_SHIFT; - openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */ - - if (userdatalen > MAX_USER_DEFINED_BYTES) { - err = -EINVAL; - goto errorout; - } - - if (userdatalen) - memcpy(openMsg->UserData, userdata, userdatalen); - - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_add_tail(&openInfo->MsgListEntry, - &gVmbusConnection.ChannelMsgList); - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - - DPRINT_DBG(VMBUS, "Sending channel open msg..."); - - ret = VmbusPostMessage(openMsg, - sizeof(struct vmbus_channel_open_channel)); - if (ret != 0) { - DPRINT_ERR(VMBUS, "unable to open channel - %d", ret); - goto Cleanup; - } - - /* FIXME: Need to time-out here */ - osd_WaitEventWait(openInfo->WaitEvent); - - if (openInfo->Response.OpenResult.Status == 0) - DPRINT_INFO(VMBUS, "channel <%p> open success!!", newchannel); - else - DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!", - newchannel, openInfo->Response.OpenResult.Status); - -Cleanup: - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_del(&openInfo->MsgListEntry); - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - - kfree(openInfo->WaitEvent); - kfree(openInfo); - return 0; - -errorout: - RingBufferCleanup(&newchannel->Outbound); - RingBufferCleanup(&newchannel->Inbound); - osd_PageFree(out, (send_ringbuffer_size + recv_ringbuffer_size) - >> PAGE_SHIFT); - kfree(openInfo); - return err; -} -EXPORT_SYMBOL_GPL(vmbus_open); - -/* - * dump_gpadl_body - Dump the gpadl body message to the console for - * debugging purposes. - */ -static void dump_gpadl_body(struct vmbus_channel_gpadl_body *gpadl, u32 len) -{ - int i; - int pfncount; - - pfncount = (len - sizeof(struct vmbus_channel_gpadl_body)) / - sizeof(u64); - DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", len, pfncount); - - for (i = 0; i < pfncount; i++) - DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu", - i, gpadl->Pfn[i]); -} - -/* - * dump_gpadl_header - Dump the gpadl header message to the console for - * debugging purposes. - */ -static void dump_gpadl_header(struct vmbus_channel_gpadl_header *gpadl) -{ - int i, j; - int pagecount; - - DPRINT_DBG(VMBUS, - "gpadl header - relid %d, range count %d, range buflen %d", - gpadl->ChildRelId, gpadl->RangeCount, gpadl->RangeBufLen); - for (i = 0; i < gpadl->RangeCount; i++) { - pagecount = gpadl->Range[i].ByteCount >> PAGE_SHIFT; - pagecount = (pagecount > 26) ? 26 : pagecount; - - DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d " - "page count %d", i, gpadl->Range[i].ByteCount, - gpadl->Range[i].ByteOffset, pagecount); - - for (j = 0; j < pagecount; j++) - DPRINT_DBG(VMBUS, "%d) pfn %llu", j, - gpadl->Range[i].PfnArray[j]); - } -} - -/* - * create_gpadl_header - Creates a gpadl for the specified buffer - */ -static int create_gpadl_header(void *kbuffer, u32 size, - struct vmbus_channel_msginfo **msginfo, - u32 *messagecount) -{ - int i; - int pagecount; - unsigned long long pfn; - struct vmbus_channel_gpadl_header *gpadl_header; - struct vmbus_channel_gpadl_body *gpadl_body; - struct vmbus_channel_msginfo *msgheader; - struct vmbus_channel_msginfo *msgbody = NULL; - u32 msgsize; - - int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; - - /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */ - /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */ - - pagecount = size >> PAGE_SHIFT; - pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; - - /* do we need a gpadl body msg */ - pfnsize = MAX_SIZE_CHANNEL_MESSAGE - - sizeof(struct vmbus_channel_gpadl_header) - - sizeof(struct gpa_range); - pfncount = pfnsize / sizeof(u64); - - if (pagecount > pfncount) { - /* we need a gpadl body */ - /* fill in the header */ - msgsize = sizeof(struct vmbus_channel_msginfo) + - sizeof(struct vmbus_channel_gpadl_header) + - sizeof(struct gpa_range) + pfncount * sizeof(u64); - msgheader = kzalloc(msgsize, GFP_KERNEL); - if (!msgheader) - goto nomem; - - INIT_LIST_HEAD(&msgheader->SubMsgList); - msgheader->MessageSize = msgsize; - - gpadl_header = (struct vmbus_channel_gpadl_header *) - msgheader->Msg; - gpadl_header->RangeCount = 1; - gpadl_header->RangeBufLen = sizeof(struct gpa_range) + - pagecount * sizeof(u64); - gpadl_header->Range[0].ByteOffset = 0; - gpadl_header->Range[0].ByteCount = size; - for (i = 0; i < pfncount; i++) - gpadl_header->Range[0].PfnArray[i] = pfn+i; - *msginfo = msgheader; - *messagecount = 1; - - pfnsum = pfncount; - pfnleft = pagecount - pfncount; - - /* how many pfns can we fit */ - pfnsize = MAX_SIZE_CHANNEL_MESSAGE - - sizeof(struct vmbus_channel_gpadl_body); - pfncount = pfnsize / sizeof(u64); - - /* fill in the body */ - while (pfnleft) { - if (pfnleft > pfncount) - pfncurr = pfncount; - else - pfncurr = pfnleft; - - msgsize = sizeof(struct vmbus_channel_msginfo) + - sizeof(struct vmbus_channel_gpadl_body) + - pfncurr * sizeof(u64); - msgbody = kzalloc(msgsize, GFP_KERNEL); - /* FIXME: we probably need to more if this fails */ - if (!msgbody) - goto nomem; - msgbody->MessageSize = msgsize; - (*messagecount)++; - gpadl_body = - (struct vmbus_channel_gpadl_body *)msgbody->Msg; - - /* - * FIXME: - * Gpadl is u32 and we are using a pointer which could - * be 64-bit - */ - /* gpadl_body->Gpadl = kbuffer; */ - for (i = 0; i < pfncurr; i++) - gpadl_body->Pfn[i] = pfn + pfnsum + i; - - /* add to msg header */ - list_add_tail(&msgbody->MsgListEntry, - &msgheader->SubMsgList); - pfnsum += pfncurr; - pfnleft -= pfncurr; - } - } else { - /* everything fits in a header */ - msgsize = sizeof(struct vmbus_channel_msginfo) + - sizeof(struct vmbus_channel_gpadl_header) + - sizeof(struct gpa_range) + pagecount * sizeof(u64); - msgheader = kzalloc(msgsize, GFP_KERNEL); - if (msgheader == NULL) - goto nomem; - msgheader->MessageSize = msgsize; - - gpadl_header = (struct vmbus_channel_gpadl_header *) - msgheader->Msg; - gpadl_header->RangeCount = 1; - gpadl_header->RangeBufLen = sizeof(struct gpa_range) + - pagecount * sizeof(u64); - gpadl_header->Range[0].ByteOffset = 0; - gpadl_header->Range[0].ByteCount = size; - for (i = 0; i < pagecount; i++) - gpadl_header->Range[0].PfnArray[i] = pfn+i; - - *msginfo = msgheader; - *messagecount = 1; - } - - return 0; -nomem: - kfree(msgheader); - kfree(msgbody); - return -ENOMEM; -} - -/* - * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer - * - * @channel: a channel - * @kbuffer: from kmalloc - * @size: page-size multiple - * @gpadl_handle: some funky thing - */ -int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, - u32 size, u32 *gpadl_handle) -{ - struct vmbus_channel_gpadl_header *gpadlmsg; - struct vmbus_channel_gpadl_body *gpadl_body; - /* struct vmbus_channel_gpadl_created *gpadlCreated; */ - struct vmbus_channel_msginfo *msginfo = NULL; - struct vmbus_channel_msginfo *submsginfo; - u32 msgcount; - struct list_head *curr; - u32 next_gpadl_handle; - unsigned long flags; - int ret = 0; - - next_gpadl_handle = atomic_read(&gVmbusConnection.NextGpadlHandle); - atomic_inc(&gVmbusConnection.NextGpadlHandle); - - ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); - if (ret) - return ret; - - msginfo->WaitEvent = osd_WaitEventCreate(); - if (!msginfo->WaitEvent) { - ret = -ENOMEM; - goto Cleanup; - } - - gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->Msg; - gpadlmsg->Header.MessageType = ChannelMessageGpadlHeader; - gpadlmsg->ChildRelId = channel->OfferMsg.ChildRelId; - gpadlmsg->Gpadl = next_gpadl_handle; - - dump_gpadl_header(gpadlmsg); - - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_add_tail(&msginfo->MsgListEntry, - &gVmbusConnection.ChannelMsgList); - - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d", - kbuffer, size, msgcount); - - DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd", - msginfo->MessageSize - sizeof(*msginfo)); - - ret = VmbusPostMessage(gpadlmsg, msginfo->MessageSize - - sizeof(*msginfo)); - if (ret != 0) { - DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret); - goto Cleanup; - } - - if (msgcount > 1) { - list_for_each(curr, &msginfo->SubMsgList) { - - /* FIXME: should this use list_entry() instead ? */ - submsginfo = (struct vmbus_channel_msginfo *)curr; - gpadl_body = - (struct vmbus_channel_gpadl_body *)submsginfo->Msg; - - gpadl_body->Header.MessageType = - ChannelMessageGpadlBody; - gpadl_body->Gpadl = next_gpadl_handle; - - DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd", - submsginfo->MessageSize - - sizeof(*submsginfo)); - - dump_gpadl_body(gpadl_body, submsginfo->MessageSize - - sizeof(*submsginfo)); - ret = VmbusPostMessage(gpadl_body, - submsginfo->MessageSize - - sizeof(*submsginfo)); - if (ret != 0) - goto Cleanup; - - } - } - osd_WaitEventWait(msginfo->WaitEvent); - - /* At this point, we received the gpadl created msg */ - DPRINT_DBG(VMBUS, "Received GPADL created " - "(relid %d, status %d handle %x)", - channel->OfferMsg.ChildRelId, - msginfo->Response.GpadlCreated.CreationStatus, - gpadlmsg->Gpadl); - - *gpadl_handle = gpadlmsg->Gpadl; - -Cleanup: - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_del(&msginfo->MsgListEntry); - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - - kfree(msginfo->WaitEvent); - kfree(msginfo); - return ret; -} -EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); - -/* - * vmbus_teardown_gpadl -Teardown the specified GPADL handle - */ -int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) -{ - struct vmbus_channel_gpadl_teardown *msg; - struct vmbus_channel_msginfo *info; - unsigned long flags; - int ret; - - /* ASSERT(gpadl_handle != 0); */ - - info = kmalloc(sizeof(*info) + - sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); - if (!info) - return -ENOMEM; - - info->WaitEvent = osd_WaitEventCreate(); - if (!info->WaitEvent) { - kfree(info); - return -ENOMEM; - } - - msg = (struct vmbus_channel_gpadl_teardown *)info->Msg; - - msg->Header.MessageType = ChannelMessageGpadlTeardown; - msg->ChildRelId = channel->OfferMsg.ChildRelId; - msg->Gpadl = gpadl_handle; - - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_add_tail(&info->MsgListEntry, - &gVmbusConnection.ChannelMsgList); - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - - ret = VmbusPostMessage(msg, - sizeof(struct vmbus_channel_gpadl_teardown)); - if (ret != 0) { - /* TODO: */ - /* something... */ - } - - osd_WaitEventWait(info->WaitEvent); - - /* Received a torndown response */ - spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); - list_del(&info->MsgListEntry); - spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); - - kfree(info->WaitEvent); - 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; - struct vmbus_channel_msginfo *info; - unsigned long flags; - int ret; - - /* Stop callback and cancel the timer asap */ - channel->OnChannelCallback = NULL; - del_timer_sync(&channel->poll_timer); - - /* Send a closing message */ - info = kmalloc(sizeof(*info) + - sizeof(struct vmbus_channel_close_channel), GFP_KERNEL); - /* FIXME: can't do anything other than return here because the - * function is void */ - if (!info) - return; - - /* info->waitEvent = osd_WaitEventCreate(); */ - - msg = (struct vmbus_channel_close_channel *)info->Msg; - msg->Header.MessageType = ChannelMessageCloseChannel; - msg->ChildRelId = channel->OfferMsg.ChildRelId; - - ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel)); - if (ret != 0) { - /* TODO: */ - /* something... */ - } - - /* Tear down the gpadl for the channel's ring buffer */ - if (channel->RingBufferGpadlHandle) - vmbus_teardown_gpadl(channel, - channel->RingBufferGpadlHandle); - - /* TODO: Send a msg to release the childRelId */ - - /* Cleanup the ring buffers for this channel */ - RingBufferCleanup(&channel->Outbound); - RingBufferCleanup(&channel->Inbound); - - osd_PageFree(channel->RingBufferPages, channel->RingBufferPageCount); - - kfree(info); - - /* - * If we are closing the channel during an error path in - * opening the channel, don't free the channel since the - * caller will free the channel - */ - - if (channel->State == CHANNEL_OPEN_STATE) { - spin_lock_irqsave(&gVmbusConnection.channel_lock, flags); - list_del(&channel->ListEntry); - spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags); - - free_channel(channel); - } -} -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_UP(packetlen, sizeof(u64)); - struct scatterlist bufferlist[3]; - u64 aligned_data = 0; - int ret; - - DPRINT_DBG(VMBUS, "channel %p buffer %p len %d", - channel, buffer, bufferlen); - - dump_vmbus_channel(channel); - - /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ - - /* Setup the descriptor */ - desc.Type = type; /* VmbusPacketTypeDataInBand; */ - desc.Flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ - /* in 8-bytes granularity */ - desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3; - desc.Length8 = (u16)(packetlen_aligned >> 3); - desc.TransactionId = 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 = RingBufferWrite(&channel->Outbound, bufferlist, 3); - - /* TODO: We should determine if this is optional */ - if (ret == 0 && !GetRingBufferInterruptMask(&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; - - dump_vmbus_channel(channel); - - /* - * 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_UP(packetlen, sizeof(u64)); - - /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ - - /* Setup the descriptor */ - desc.type = VmbusPacketTypeDataUsingGpaDirect; - 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].Length = pagebuffers[i].Length; - 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 = RingBufferWrite(&channel->Outbound, bufferlist, 3); - - /* TODO: We should determine if this is optional */ - if (ret == 0 && !GetRingBufferInterruptMask(&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->Length); - - dump_vmbus_channel(channel); - - DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u", - multi_pagebuffer->Offset, - multi_pagebuffer->Length, pfncount); - - 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_UP(packetlen, sizeof(u64)); - - /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ - - /* Setup the descriptor */ - desc.type = VmbusPacketTypeDataUsingGpaDirect; - 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.Length = multi_pagebuffer->Length; - desc.range.Offset = multi_pagebuffer->Offset; - - memcpy(desc.range.PfnArray, multi_pagebuffer->PfnArray, - 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 = RingBufferWrite(&channel->Outbound, bufferlist, 3); - - /* TODO: We should determine if this is optional */ - if (ret == 0 && !GetRingBufferInterruptMask(&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; - unsigned long flags; - - *buffer_actual_len = 0; - *requestid = 0; - - spin_lock_irqsave(&channel->inbound_lock, flags); - - ret = RingBufferPeek(&channel->Inbound, &desc, - sizeof(struct vmpacket_descriptor)); - if (ret != 0) { - spin_unlock_irqrestore(&channel->inbound_lock, flags); - - /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ - return 0; - } - - /* VmbusChannelClearEvent(Channel); */ - - packetlen = desc.Length8 << 3; - userlen = packetlen - (desc.DataOffset8 << 3); - /* ASSERT(userLen > 0); */ - - DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " - "flag %d tid %llx pktlen %d datalen %d> ", - channel, channel->OfferMsg.ChildRelId, desc.Type, - desc.Flags, desc.TransactionId, packetlen, userlen); - - *buffer_actual_len = userlen; - - if (userlen > bufferlen) { - spin_unlock_irqrestore(&channel->inbound_lock, flags); - - DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d", - bufferlen, userlen); - return -1; - } - - *requestid = desc.TransactionId; - - /* Copy over the packet to the user buffer */ - ret = RingBufferRead(&channel->Inbound, buffer, userlen, - (desc.DataOffset8 << 3)); - - spin_unlock_irqrestore(&channel->inbound_lock, flags); - - 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; - unsigned long flags; - - *buffer_actual_len = 0; - *requestid = 0; - - spin_lock_irqsave(&channel->inbound_lock, flags); - - ret = RingBufferPeek(&channel->Inbound, &desc, - sizeof(struct vmpacket_descriptor)); - if (ret != 0) { - spin_unlock_irqrestore(&channel->inbound_lock, flags); - - /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ - return 0; - } - - /* VmbusChannelClearEvent(Channel); */ - - packetlen = desc.Length8 << 3; - userlen = packetlen - (desc.DataOffset8 << 3); - - DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " - "flag %d tid %llx pktlen %d datalen %d> ", - channel, channel->OfferMsg.ChildRelId, desc.Type, - desc.Flags, desc.TransactionId, packetlen, userlen); - - *buffer_actual_len = packetlen; - - if (packetlen > bufferlen) { - spin_unlock_irqrestore(&channel->inbound_lock, flags); - - DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but " - "got space for only %d bytes", packetlen, bufferlen); - return -2; - } - - *requestid = desc.TransactionId; - - /* Copy over the entire packet to the user buffer */ - ret = RingBufferRead(&channel->Inbound, buffer, packetlen, 0); - - spin_unlock_irqrestore(&channel->inbound_lock, flags); - return 0; -} -EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); - -/* - * vmbus_onchannel_event - Channel event callback - */ -void vmbus_onchannel_event(struct vmbus_channel *channel) -{ - dump_vmbus_channel(channel); - /* ASSERT(Channel->OnChannelCallback); */ - - channel->OnChannelCallback(channel->ChannelCallbackContext); - - mod_timer(&channel->poll_timer, jiffies + usecs_to_jiffies(100)); -} - -/* - * vmbus_ontimer - Timer event callback - */ -void vmbus_ontimer(unsigned long data) -{ - struct vmbus_channel *channel = (struct vmbus_channel *)data; - - if (channel->OnChannelCallback) - channel->OnChannelCallback(channel->ChannelCallbackContext); -} - -/* - * dump_vmbus_channel- Dump vmbus channel info to the console - */ -static void dump_vmbus_channel(struct vmbus_channel *channel) -{ - DPRINT_DBG(VMBUS, "Channel (%d)", channel->OfferMsg.ChildRelId); - DumpRingInfo(&channel->Outbound, "Outbound "); - DumpRingInfo(&channel->Inbound, "Inbound "); -} |