From mboxrd@z Thu Jan  1 00:00:00 1970
From: catalin.marinas@arm.com (Catalin Marinas)
Date: Tue, 6 May 2014 10:58:53 +0100
Subject: [PATCH V2] arm64: mm: Create gigabyte kernel logical mappings
 where possible
In-Reply-To: <1399043829-9036-1-git-send-email-steve.capper@linaro.org>
References: <1399043829-9036-1-git-send-email-steve.capper@linaro.org>
Message-ID: <20140506095850.GA23957@arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, May 02, 2014 at 04:17:09PM +0100, Steve Capper wrote:
> We have the capability to map 1GB level 1 blocks when using a 4K
> granule.
> 
> This patch adjusts the create_mapping logic s.t. when mapping physical
> memory on boot, we attempt to use a 1GB block if both the VA and PA
> start and end are 1GB aligned. This both reduces the levels of lookup
> required to resolve a kernel logical address, as well as reduces TLB
> pressure on cores that support 1GB TLB entries.
> 
> Signed-off-by: Steve Capper <steve.capper@linaro.org>

I think you need to patch kern_addr_valid as well for this (we recently
pushed a patch to detect pmd block mappings).

-- 
Catalin