From mboxrd@z Thu Jan  1 00:00:00 1970
From: santosh.shilimkar@oracle.com (santosh shilimkar)
Date: Tue, 30 Jun 2015 07:50:45 -0700
Subject: [PATCH] ARM: psci: boot_secondary: replace __pa with virt_to_idmap
In-Reply-To: <1435661062-4127-1-git-send-email-grygorii.strashko@ti.com>
References: <1435661062-4127-1-git-send-email-grygorii.strashko@ti.com>
Message-ID: <5592ACC5.4010500@oracle.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 6/30/2015 3:44 AM, Grygorii Strashko wrote:
> On some PAE systems (e.g. TI Keystone), memory is above the 32-bit
> addressable limit, and the interconnect provides an aliased view of
> parts of physical memory in the 32-bit addressable space. This alias
> is strictly for boot time usage, and is not otherwise usable because
> of coherency limitations.
>
> On such systems, the idmap mechanism has to be used to pass correct
> boot address of secondary CPU to FW.
> virt_to_idmap() will fall-back to existing virt_to_phys() macro if
> such conversation is not required.
>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Nicolas Pitre <nico@linaro.org>
> Cc: Santosh Shilimkar <ssantosh@kernel.org>
> Cc: Vitaly Andrianov <vitalya@ti.com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
> ---
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>

>   arch/arm/kernel/psci_smp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c
> index 28a1db4..244aadd 100644
> --- a/arch/arm/kernel/psci_smp.c
> +++ b/arch/arm/kernel/psci_smp.c
> @@ -51,7 +51,7 @@ static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
>   {
>   	if (psci_ops.cpu_on)
>   		return psci_ops.cpu_on(cpu_logical_map(cpu),
> -				       __pa(secondary_startup));
> +					virt_to_idmap(&secondary_startup));
>   	return -ENODEV;
>   }
>
>