[v1] Drivers: hv: vmbus: Wait for offers and log missing offers

[PATCH 2/2] Drivers: hv: vmbus: Log on missing offers

Posted by Naman Jain 1 month, 1 week ago

From: John Starks <jostarks@microsoft.com>

When resuming from hibernation, log any channels that were present
before hibernation but now are gone.

Signed-off-by: John Starks <jostarks@microsoft.com>
Co-developed-by: Naman Jain <namjain@linux.microsoft.com>
Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
---
 drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index bd3fc41dc06b..1f56d138210e 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2462,6 +2462,7 @@ static int vmbus_bus_suspend(struct device *dev)
 
 static int vmbus_bus_resume(struct device *dev)
 {
+	struct vmbus_channel *channel;
 	struct vmbus_channel_msginfo *msginfo;
 	size_t msgsize;
 	int ret;
@@ -2494,6 +2495,21 @@ static int vmbus_bus_resume(struct device *dev)
 
 	vmbus_request_offers();
 
+	mutex_lock(&vmbus_connection.channel_mutex);
+	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+		if (channel->offermsg.child_relid != INVALID_RELID)
+			continue;
+
+		/* hvsock channels are not expected to be present. */
+		if (is_hvsock_channel(channel))
+			continue;
+
+		pr_err("channel %pUl/%pUl not present after resume.\n",
+			&channel->offermsg.offer.if_type,
+			&channel->offermsg.offer.if_instance);
+	}
+	mutex_unlock(&vmbus_connection.channel_mutex);
+
 	/* Reset the event for the next suspend. */
 	reinit_completion(&vmbus_connection.ready_for_suspend_event);
 
-- 
2.34.1

Re: [PATCH 2/2] Drivers: hv: vmbus: Log on missing offers

Posted by Saurabh Singh Sengar 1 month ago

On Fri, Oct 18, 2024 at 04:58:11AM -0700, Naman Jain wrote:
> From: John Starks <jostarks@microsoft.com>
> 
> When resuming from hibernation, log any channels that were present
> before hibernation but now are gone.
> 
> Signed-off-by: John Starks <jostarks@microsoft.com>
> Co-developed-by: Naman Jain <namjain@linux.microsoft.com>
> Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
> ---
>  drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index bd3fc41dc06b..1f56d138210e 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -2462,6 +2462,7 @@ static int vmbus_bus_suspend(struct device *dev)
>  
>  static int vmbus_bus_resume(struct device *dev)
>  {
> +	struct vmbus_channel *channel;
>  	struct vmbus_channel_msginfo *msginfo;
>  	size_t msgsize;
>  	int ret;
> @@ -2494,6 +2495,21 @@ static int vmbus_bus_resume(struct device *dev)
>  
>  	vmbus_request_offers();
>  
> +	mutex_lock(&vmbus_connection.channel_mutex);
> +	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
> +		if (channel->offermsg.child_relid != INVALID_RELID)
> +			continue;
> +
> +		/* hvsock channels are not expected to be present. */
> +		if (is_hvsock_channel(channel))
> +			continue;
> +
> +		pr_err("channel %pUl/%pUl not present after resume.\n",
> +			&channel->offermsg.offer.if_type,
> +			&channel->offermsg.offer.if_instance);

Do we want to put a TODO here, so as to do cleanup of these channels
like force rescind etc later ?

- Saurabh

Re: [PATCH 2/2] Drivers: hv: vmbus: Log on missing offers

Posted by Naman Jain 1 month ago


On 10/21/2024 9:56 AM, Saurabh Singh Sengar wrote:
> On Fri, Oct 18, 2024 at 04:58:11AM -0700, Naman Jain wrote:
>> From: John Starks <jostarks@microsoft.com>
>>
>> When resuming from hibernation, log any channels that were present
>> before hibernation but now are gone.
>>
>> Signed-off-by: John Starks <jostarks@microsoft.com>
>> Co-developed-by: Naman Jain <namjain@linux.microsoft.com>
>> Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
>> ---
>>   drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
>> index bd3fc41dc06b..1f56d138210e 100644
>> --- a/drivers/hv/vmbus_drv.c
>> +++ b/drivers/hv/vmbus_drv.c
>> @@ -2462,6 +2462,7 @@ static int vmbus_bus_suspend(struct device *dev)
>>   
>>   static int vmbus_bus_resume(struct device *dev)
>>   {
>> +	struct vmbus_channel *channel;
>>   	struct vmbus_channel_msginfo *msginfo;
>>   	size_t msgsize;
>>   	int ret;
>> @@ -2494,6 +2495,21 @@ static int vmbus_bus_resume(struct device *dev)
>>   
>>   	vmbus_request_offers();
>>   
>> +	mutex_lock(&vmbus_connection.channel_mutex);
>> +	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
>> +		if (channel->offermsg.child_relid != INVALID_RELID)
>> +			continue;
>> +
>> +		/* hvsock channels are not expected to be present. */
>> +		if (is_hvsock_channel(channel))
>> +			continue;
>> +
>> +		pr_err("channel %pUl/%pUl not present after resume.\n",
>> +			&channel->offermsg.offer.if_type,
>> +			&channel->offermsg.offer.if_instance);
> 
> Do we want to put a TODO here, so as to do cleanup of these channels
> like force rescind etc later ?
> 
> - Saurabh


Sure, we can put that.

Regards,
Naman

Re: [PATCH 2/2] Drivers: hv: vmbus: Log on missing offers

Posted by Easwar Hariharan 1 month ago

On 10/18/2024 4:58 AM, Naman Jain wrote:
> From: John Starks <jostarks@microsoft.com>
> 
> When resuming from hibernation, log any channels that were present
> before hibernation but now are gone.
> 
> Signed-off-by: John Starks <jostarks@microsoft.com>
> Co-developed-by: Naman Jain <namjain@linux.microsoft.com>
> Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
> ---
>  drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>

Looks good to me.

Reviewed-by: Easwar Hariharan <eahariha@linux.microsoft.com>