From f70575805708cabdedea7498aaa3f710fde4d920 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 03:29:01 +0000
Subject: [PATCH] add lvds1024*800
---
kernel/drivers/hv/hv_snapshot.c | 73 ++++++++++++++++++++++++++++--------
1 files changed, 57 insertions(+), 16 deletions(-)
diff --git a/kernel/drivers/hv/hv_snapshot.c b/kernel/drivers/hv/hv_snapshot.c
index 6831efd..783779e 100644
--- a/kernel/drivers/hv/hv_snapshot.c
+++ b/kernel/drivers/hv/hv_snapshot.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* An implementation of host initiated guest snapshot.
*
- *
* Copyright (C) 2013, Microsoft, Inc.
* Author : K. Y. Srinivasan <kys@microsoft.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for more
- * details.
- *
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -23,6 +12,7 @@
#include <linux/connector.h>
#include <linux/workqueue.h>
#include <linux/hyperv.h>
+#include <asm/hyperv-tlfs.h>
#include "hyperv_vmbus.h"
#include "hv_utils_transport.h"
@@ -90,7 +80,7 @@
{
/* Transaction is finished, reset the state here to avoid races. */
vss_transaction.state = HVUTIL_READY;
- hv_vss_onchannelcallback(channel);
+ tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event);
}
/*
@@ -308,7 +298,7 @@
if (vss_transaction.state > HVUTIL_READY)
return;
- vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen,
+ vmbus_recvpacket(channel, recv_buffer, HV_HYP_PAGE_SIZE * 2, &recvlen,
&requestid);
if (recvlen > 0) {
@@ -389,10 +379,61 @@
return 0;
}
+static void hv_vss_cancel_work(void)
+{
+ cancel_delayed_work_sync(&vss_timeout_work);
+ cancel_work_sync(&vss_handle_request_work);
+}
+
+int hv_vss_pre_suspend(void)
+{
+ struct vmbus_channel *channel = vss_transaction.recv_channel;
+ struct hv_vss_msg *vss_msg;
+
+ /*
+ * Fake a THAW message for the user space daemon in case the daemon
+ * has frozen the file systems. It doesn't matter if there is already
+ * a message pending to be delivered to the user space since we force
+ * vss_transaction.state to be HVUTIL_READY, so the user space daemon's
+ * write() will fail with EINVAL (see vss_on_msg()), and the daemon
+ * will reset the device by closing and re-opening it.
+ */
+ vss_msg = kzalloc(sizeof(*vss_msg), GFP_KERNEL);
+ if (!vss_msg)
+ return -ENOMEM;
+
+ tasklet_disable(&channel->callback_event);
+
+ vss_msg->vss_hdr.operation = VSS_OP_THAW;
+
+ /* Cancel any possible pending work. */
+ hv_vss_cancel_work();
+
+ /* We don't care about the return value. */
+ hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg), NULL);
+
+ kfree(vss_msg);
+
+ vss_transaction.state = HVUTIL_READY;
+
+ /* tasklet_enable() will be called in hv_vss_pre_resume(). */
+ return 0;
+}
+
+int hv_vss_pre_resume(void)
+{
+ struct vmbus_channel *channel = vss_transaction.recv_channel;
+
+ tasklet_enable(&channel->callback_event);
+
+ return 0;
+}
+
void hv_vss_deinit(void)
{
vss_transaction.state = HVUTIL_DEVICE_DYING;
- cancel_delayed_work_sync(&vss_timeout_work);
- cancel_work_sync(&vss_handle_request_work);
+
+ hv_vss_cancel_work();
+
hvutil_transport_destroy(hvt);
}
--
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