[PATCH 2/2] powerpc/85xx: describe the PAMU topology in the device tree
scottwood at freescale.com
Thu Jan 24 09:15:19 EST 2013
On 01/23/2013 11:27:29 AM, Gala Kumar-B11780 wrote:
> On Jan 17, 2013, at 4:34 PM, Timur Tabi wrote:
> > From: Timur Tabi <timur at freescale.com>
> > The PAMU caches use the LIODNs to determine which cache lines hold
> > entries for the corresponding LIODs. The LIODNs must therefore be
> > carefully assigned to avoid cache thrashing -- two active LIODs with
> > LIODNs that put them in the same cache line.
> > Currently, LIODNs are statically assigned by U-Boot, but this has
> > limitations. LIODNs are assigned even for devices that may be
> > or unused by the kernel. Static assignments also do not allow for
> > drivers which may know which LIODs can be used simultaneously. In
> > other words, we really should assign LIODNs dynamically in Linux.
> > To do that, we need to describe the PAMU device and cache
> topologies in
> > the device trees.
> > Signed-off-by: Timur Tabi <timur at freescale.com>
> > ---
> > .../devicetree/bindings/powerpc/fsl/guts.txt | 14 ++-
> > .../devicetree/bindings/powerpc/fsl/pamu.txt | 142
> > arch/powerpc/boot/dts/fsl/p2041si-post.dtsi | 87
> > arch/powerpc/boot/dts/fsl/p3041si-post.dtsi | 87
> > arch/powerpc/boot/dts/fsl/p4080si-post.dtsi | 68 +++++++++-
> > arch/powerpc/boot/dts/fsl/p5020si-post.dtsi | 92
> > arch/powerpc/boot/dts/fsl/p5040si-post.dtsi | 92
> > 7 files changed, 533 insertions(+), 49 deletions(-)
> > create mode 100644
> Scott, Stuart, does this have your guys Ack?
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