linux-kernel - Re: [UPDATED] [PATCH 3/5] arm-cci: Get rid of secure transactions for PMU driver

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Message-ID: <550B0CF6.8070205@arm.com>
Date:	Thu, 19 Mar 2015 17:52:54 +0000
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	Sudeep Holla <Sudeep.Holla@....com>,
	Mark Rutland <Mark.Rutland@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Nicolas Pitre <nico@...aro.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Olof Johansson <olof@...om.net>,
	Pawel Moll <Pawel.Moll@....com>,
	Punit Agrawal <Punit.Agrawal@....com>,
	Will Deacon <Will.Deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [UPDATED] [PATCH 3/5] arm-cci: Get rid of secure transactions
 for PMU driver

On 19/03/15 17:38, Sudeep Holla wrote:
>
>
> On 19/03/15 17:32, Mark Rutland wrote:
>> One more thing:
>>
>>> @@ -883,7 +894,11 @@ static inline const struct cci_pmu_model *get_cci_model(struct platform_device *
>>>    							pdev->dev.of_node);
>>>    	if (!match)
>>>    		return NULL;
>>> +	if (match->data)
>>> +		return match->data;
>>>
>>> +	dev_warn(&pdev->dev, "DEPRECATED compatible property,"
>>> +			 "requires secure access to CCI registers");
>>>    	return probe_cci_model(pdev);
>>>    }
>>
>> Before the probe, could we please have:
>>
>> 	if (!IS_ENABLED(CONFIG_ARM))
>> 		return -EINVAL;
>>
>> On arm64 we require a model-specific string, and we shouldn't go
>> touching secure-only registers.
>>
>
> IIUC platform_has_secure_cci_access always return false for ARM64
> preventing any secure access. No ?
>
Yes, you are right. The check has been abstracted away with the 
platform_has_secure_cci_access().

Cheers
Suzuki


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