Messages in this thread | | | Date | Thu, 23 Apr 2020 17:12:50 +0200 | From | Daniel Lezcano <> | Subject | Re: [PATCH v6 04/10] PM / EM: add support for other devices than CPUs in Energy Model |
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On Fri, Apr 10, 2020 at 09:42:04AM +0100, Lukasz Luba wrote: > Add support for other devices that CPUs. The registration function > does not require a valid cpumask pointer and is ready to handle new > devices. Some of the internal structures has been reorganized in order to > keep consistent view (like removing per_cpu pd pointers). To track usage > of the Energy Model structures, they are protected with kref.
Why not add the energy model structure in the struct device directly?
For instance for the em_cpu_get() function, the cpu id allows to retrieve the cpu device and then from there, the energy model instead of browsing another list. The em_device life cycle will be tied to the struct device.
Then when the struct device and the em_device are connected, add the debugfs with a struct device list for those which are energy aware, so you end up with a structure:
struct em_device { struct device *dev; struct list_head em_dev_list; };
(a global single dentry for debugfs to do a recursive delete is enough).
Locks when inspecting and add/removal called from the struct device release function. So no need of an extra refcounting.
Does it make sense?
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