[PATCH v10 08/26] gunyah: rsc_mgr: Add resource manager RPC core

[Elliot Berman]

On 2/15/2023 10:43 PM, Greg Kroah-Hartman wrote:
> On Tue, Feb 14, 2023 at 01:23:25PM -0800, Elliot Berman wrote:
>> +struct gh_rm {
>> +	struct device *dev;
> 
> What device does this point to?
> 

The platform device.

>> +	struct gunyah_resource tx_ghrsc, rx_ghrsc;
>> +	struct gh_msgq msgq;
>> +	struct mbox_client msgq_client;
>> +	struct gh_rm_connection *active_rx_connection;
>> +	int last_tx_ret;
>> +
>> +	struct idr call_idr;
>> +	struct mutex call_idr_lock;
>> +
>> +	struct kmem_cache *cache;
>> +	struct mutex send_lock;
>> +	struct blocking_notifier_head nh;
>> +};
> 
> This obviously is the "device" that your system works on, so what are
> the lifetime rules of it?  Why isn't is just a real 'struct device' in
> the system instead of a random memory blob with a pointer to a device?
> 
> What controls the lifetime of this structure and where is the reference
> counting logic for it?
> 

The lifetime of the structure is bound by the platform device that above 
struct device *dev points to. get_gh_rm and put_gh_rm increments the 
device ref counter and ensures lifetime of the struct is also extended.

> And why no documentation for this core structure?
> 

Sure, I will add.

> thanks,
> 
> greg k-h