[PATCH v2] qcom: scm: Add qcom_scm_set_warm_boot_addr function

[Lina Iyer]

On Fri, Feb 27 2015 at 14:33 -0700, Kumar Gala wrote:
>
>On Feb 27, 2015, at 2:47 PM, Lina Iyer <lina.iyer at linaro.org> wrote:
>
>> A core can be powered down for cpuidle or when it is hotplugged off. In
>> either case, the warmboot return address would be different. Allow
>> setting the warmboot address for a specific cpu, optimize and write to
>> the firmware, if the address is different than the previously set
>> address.
>>
>> Export qcom_scm_set_warm_boot_addr function move the warm boot flags to
>> implementation.
>>
>> Signed-off-by: Lina Iyer <lina.iyer at linaro.org>
>> ---
>> drivers/firmware/qcom_scm.c | 36 ++++++++++++++++++++++++++++++++++++
>> include/linux/qcom_scm.h    |  5 +----
>> 2 files changed, 37 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
>> index 6e7a72b..19133ca 100644
>> --- a/drivers/firmware/qcom_scm.c
>> +++ b/drivers/firmware/qcom_scm.c
>> @@ -34,6 +34,23 @@
>> #define QCOM_SCM_ERROR		-1
>> #define QCOM_SCM_INTERRUPTED	1
>>
>> +#define QCOM_SCM_FLAG_WARMBOOT_CPU0	0x04
>> +#define QCOM_SCM_FLAG_WARMBOOT_CPU1	0x02
>> +#define QCOM_SCM_FLAG_WARMBOOT_CPU2	0x10
>> +#define QCOM_SCM_FLAG_WARMBOOT_CPU3	0x40
>> +
>> +struct scm_warmboot {
>> +	int flag;
>> +	void *entry;
>> +};
>> +
>> +static struct scm_warmboot scm_flags[] = {
>> +	{ .flag = QCOM_SCM_FLAG_WARMBOOT_CPU0 },
>> +	{ .flag = QCOM_SCM_FLAG_WARMBOOT_CPU1 },
>> +	{ .flag = QCOM_SCM_FLAG_WARMBOOT_CPU2 },
>> +	{ .flag = QCOM_SCM_FLAG_WARMBOOT_CPU3 },
>> +};
>> +
>> static DEFINE_MUTEX(qcom_scm_lock);
>>
>> /**
>> @@ -342,3 +359,22 @@ int qcom_scm_set_boot_addr(u32 addr, int flags)
>> 			&cmd, sizeof(cmd), NULL, 0);
>> }
>> EXPORT_SYMBOL(qcom_scm_set_boot_addr);
>> +
>
>Since you are adding a new interface, can you add Kdoc style comment header.  I need to do this for the other interfaces as well.

OK.

>
>> +int qcom_scm_set_warm_boot_addr(void *entry, int cpu)
>
>I’d really like to see if we could make the set_boot_addr and set_warm_boot_addr have the same interfaces.

I am working on making the interfaces similar. There is some check in
the platsmp.c that uses the cold boot flag array to determine the
present cpus. Do you think, we can ignore that check over there? If that
can be done, I will change the interface for cold boot too.
>
>> +{
>> +	int ret;
>> +
>> +	/*
>> +	 * Reassign only if we are switching from hotplug entry point
>> +	 * to cpuidle entry point or vice versa.
>> +	 */
>> +	if (entry == scm_flags[cpu].entry)
>> +		return 0;
>> +
>> +	ret = qcom_scm_set_boot_addr(virt_to_phys(entry), scm_flags[cpu].flag);
>> +	if (!ret)
>> +		scm_flags[cpu].entry  = entry;
>> +
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
>> diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
>> index 6bb84cf..fc5aae4 100644
>> --- a/include/linux/qcom_scm.h
>> +++ b/include/linux/qcom_scm.h
>> @@ -15,12 +15,9 @@
>> #define QCOM_SCM_FLAG_COLDBOOT_CPU1		0x01
>> #define QCOM_SCM_FLAG_COLDBOOT_CPU2		0x08
>> #define QCOM_SCM_FLAG_COLDBOOT_CPU3		0x20
>> -#define QCOM_SCM_FLAG_WARMBOOT_CPU0		0x04
>> -#define QCOM_SCM_FLAG_WARMBOOT_CPU1		0x02
>> -#define QCOM_SCM_FLAG_WARMBOOT_CPU2		0x10
>> -#define QCOM_SCM_FLAG_WARMBOOT_CPU3		0x40
>>
>> extern int qcom_scm_set_boot_addr(u32 addr, int flags);
>> +extern int qcom_scm_set_warm_boot_addr(void *entry, int cpu);
>>
>> #define QCOM_SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF))
>>
>> --
>> 2.1.0
>>
>> --
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>
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