linux-kernel - Re: [PATCH] ARM: qcom: Fix SCM interface for big-endian kernels

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Date:	Tue, 23 Sep 2014 13:31:41 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Kumar Gala <galak@...eaurora.org>
CC:	David Brown <davidb@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: qcom: Fix SCM interface for big-endian kernels

On 09/23/14 10:45, Kumar Gala wrote:
> On Sep 23, 2014, at 12:42 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>
>> On 09/23/14 09:47, Kumar Gala wrote:
>>> On Sep 22, 2014, at 5:36 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>>>
>>>> The secure environment only runs in little-endian mode, so any
>>>> buffers shared with the secure environment should have their
>>>> contents converted to little-endian. We also mark such elements
>>>> with __le32 to allow sparse to catch such problems.
>>>>
>>>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
>>>> ---
>>>> drivers/soc/qcom/scm-boot.c |  8 ++++----
>>>> drivers/soc/qcom/scm.c      | 34 ++++++++++++++++++----------------
>>>> 2 files changed, 22 insertions(+), 20 deletions(-)
>>>>
>>>> diff --git a/drivers/soc/qcom/scm-boot.c b/drivers/soc/qcom/scm-boot.c
>>>> index 60ff7b482141..3e4d77b371c6 100644
>>>> --- a/drivers/soc/qcom/scm-boot.c
>>>> +++ b/drivers/soc/qcom/scm-boot.c
>>>> @@ -27,12 +27,12 @@
>>>> int scm_set_boot_addr(phys_addr_t addr, int flags)
>>>> {
>>>> 	struct {
>>>> -		unsigned int flags;
>>>> -		phys_addr_t  addr;
>>>> +		__le32 flags;
>>>> +		__le32 addr;
>>> Hmm, was phys_addr_t wrong here before?  I ask because don’t we support LPAE on some systems?
>> Yes it was wrong. It is exactly 32 bits wide.
> So we should probably have a patch to fix the interface scm_set_boot_addr() to take a u32 addr instead of a phys_addr_t
>

Sure I can send a patch for that too.

-- 
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