Skip to main content

Browse the archive

https://github.com/torvalds/linux
17 May 2024, 11:00:25 UTC
Revision ebd0e0f503d0774407a63ebb5ec1a90bb54941f5 authored by Paul Burton on 19 August 2016, 17:18:27 UTC, committed by Ralf Baechle on 29 September 2016, 16:59:49 UTC 
MIPS: Configure FTLB after probing TLB sizes from config4
 
On some cores (proAptiv, P5600) we make use of the sizes of the TLBs
to determine the desired FTLB:VTLB write ratio. However set_ftlb_enable
& thus calculate_ftlb_probability is called before decode_config4. This
results in us calculating a probability based on zero sizes, and we end
up setting FTLBP=3 for a 3:1 FTLB:VTLB write ratio in all cases. This
will make abysmal use of the available FTLB resources in the affected
cores.

Fix this by configuring the FTLB probability after having decoded
config4. However we do need to have enabled the FTLB before that point
such that fields in config4 actually reflect that an FTLB is present. So
set_ftlb_enable is now called twice, with flags indicating that it
should configure the write probability only the second time.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: cf0a8aa0226d ("MIPS: cpu-probe: Set the FTLB probability bit on supported cores")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14022/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 72c70f0
History
Tip revision: ebd0e0f503d0774407a63ebb5ec1a90bb54941f5 authored by Paul Burton on 19 August 2016, 17:18:27 UTC
MIPS: Configure FTLB after probing TLB sizes from config4
Tip revision: ebd0e0f
File Mode Size
Documentation
arch
block
certs
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitignore -rw-r--r-- 1.3 KB
.mailmap -rw-r--r-- 7.3 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 95.5 KB
Kbuild -rw-r--r-- 2.8 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 363.9 KB
Makefile -rw-r--r-- 56.8 KB
README -rw-r--r-- 18.1 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

README

back to top