[Skiboot] [PATCH] v3 mambo: Advertise available RADIX page sizes

[Chris Smart]

OMG I'm still asleep. Expect a v4 with the inline comments removed...

-c

On Sun, Oct 02, 2016 at 09:07:28AM +1100, Chris Smart wrote:
>This adds a device tree entry which advertises additional support for 2M
>and 1G pages in a PAPR compliant manner. Without this, the kernel will
>default to only 4K and 64K page sizes.
>
>With this patch, 1G (0x40000000) pages for linear mapping will be used.
>This can be seen by when checking the output of "Mapping range" in the
>kernel log:
>
># dmesg |grep "Mapping range"
>Mapping range 0x0 - 0x100000000 with 0x40000000
>
>Without this patch, the kernel will use 64K (0x10000) instead:
>
># dmesg |grep "Mapping range"
>Mapping range 0x0 - 0x100000000 with 0x10000
>
>Signed-off-by: Chris Smart <chris at distroguy.com>
>---
>
>Changes since v2:
>- add signed off by
>
>external/mambo/skiboot.tcl | 14 ++++++++++++--
>1 file changed, 12 insertions(+), 2 deletions(-)
>
>diff --git a/external/mambo/skiboot.tcl b/external/mambo/skiboot.tcl
>index e9aea028edcc..a92bf336de9d 100644
>--- a/external/mambo/skiboot.tcl
>+++ b/external/mambo/skiboot.tcl
>@@ -205,8 +205,16 @@ for { set c 0 } { $c < $mconf(cpus) } { incr c } {
>    lappend reg 0x22 0x120 1 0x22 0x0003 ;# 16G seg 16G pages
>    mysim of addprop $cpu_node array "ibm,segment-page-sizes" reg
>
>-    set reg {}
>    if { $default_config == "P9" } {
>+        # Set actual page size encodings
>+        set reg {}
>+        lappend reg 0x0000000c # 4K pages
>+        lappend reg 0xa0000010 # 64K pages
>+        lappend reg 0x20000015 # 2M pages
>+        lappend reg 0x4000001e # 1G pages
>+        mysim of addprop $cpu_node array "ibm,processor-radix-AP-encodings" reg
>+
>+        set reg {}
>	# POWER9 PAPR defines upto bytes 62-63
>	# header + bytes 0-5
>	lappend reg 0x4000f63fc70080c0
>@@ -226,10 +234,12 @@ for { set c 0 } { $c < $mconf(cpus) } { incr c } {
>	lappend reg 0x8000800080008000
>	# bytes 62-69
>	lappend reg 0x8000000000000000
>+	mysim of addprop $cpu_node array64 "ibm,pa-features" reg
>    } else {
>+        set reg {}
>	lappend reg 0x6000f63fc70080c0
>+	mysim of addprop $cpu_node array64 "ibm,pa-features" reg
>    }
>-    mysim of addprop $cpu_node array64 "ibm,pa-features" reg
>
>    set irqreg [list]
>    for { set t 0 } { $t < $mconf(threads) } { incr t } {
>-- 
>2.9.3
>
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