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From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: james.quinlan@broadcom.com,
	bcm-kernel-feedback-list@broadcom.com,
	Sudeep Holla <sudeep.holla@arm.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Jean Delvare <jdelvare@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	"open list:COMMON CLK FRAMEWORK" <linux-clk@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	"open list:CPU FREQUENCY SCALING FRAMEWORK" 
	<linux-pm@vger.kernel.org>,
	"open list:HARDWARE MONITORING" <linux-hwmon@vger.kernel.org>
Subject: Re: [PATCH RFC] firmware: arm_scmi: Allow for better protocol extensibility
Date: Thu, 23 May 2019 10:17:50 -0700	[thread overview]
Message-ID: <f9403e7e-1b87-dc46-dfc5-62227c659e7c@gmail.com> (raw)
In-Reply-To: <20190521200110.8309-1-f.fainelli@gmail.com>

On 5/21/19 1:01 PM, Florian Fainelli wrote:
> The SCMI specific allows implementors to define their custom protocols
> in the 0x80-0xFF space. The current scmi_handle structure requires us to
> extend the structure with a set of operations and associated private
> data in a way that is not quite scaling well.
> 
> Create a 255 bytes structure that contains an opaque pointer to a set of
> operations and private data and create two helper functions to retrieve
> those based on the protocol identifier. Several options were considered,
> like using a linked list but since we could be performance sensitive in
> some paths, using an array was faster and simpler.
> 
> Convert all call sites to use either scmi_protocol_get_ops() or
> scmi_protocol_get_info().
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

On second thought, what I really need is private storage to the scmi_dev
(the consumer side), and not so much the protocol (provider) side.
Therefore using dev_{set,get}_drvadata() against scmi_device::dev should
be working just fine, and if we are concerned about another part of the
SCMI stack making use of that storage, we can always extend struct
scmi_device with a private cookie.
-- 
Florian

  reply	other threads:[~2019-05-23 17:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21 20:01 Florian Fainelli
2019-05-23 17:17 ` Florian Fainelli [this message]
2019-05-24 14:19   ` Sudeep Holla

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