leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

powerpc/8xx: Move PPC_PIN_TLB options into 8xx Kconfig

Browse Source 
PPC_PIN_TLB options are dedicated to the 8xx, move them into
the 8xx Kconfig.

While we are at it, add some text to explain what it does.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1ece39fac6312e1d14e6a67b3f9d9f9f91990a7b.1589866984.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-19 05:49:12 +00:00 committed by Michael Ellerman
parent 555904d07e
commit 5d4656696c
2 changed files with 41 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/powerpc/Kconfig
View File

@ -1227,26 +1227,6 @@ config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000" if PPC_8xx
default "0xc0000000"
config PIN_TLB
bool "Pinned Kernel TLBs (860 ONLY)"
depends on ADVANCED_OPTIONS && PPC_8xx && \
!DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
config PIN_TLB_DATA
bool "Pinned TLB for DATA"
depends on PIN_TLB
default y
config PIN_TLB_IMMR
bool "Pinned TLB for IMMR"
depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
default y
config PIN_TLB_TEXT
bool "Pinned TLB for TEXT"
depends on PIN_TLB
default y
endmenu
if PPC64

41
arch/powerpc/platforms/8xx/Kconfig
View File

@ -162,4 +162,45 @@ config UCODE_PATCH
default y
depends on !NO_UCODE_PATCH
menu "8xx advanced setup"
depends on PPC_8xx
config PIN_TLB
bool "Pinned Kernel TLBs"
depends on ADVANCED_OPTIONS && !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
help
On the 8xx, we have 32 instruction TLBs and 32 data TLBs. In each
table 4 TLBs can be pinned.
It reduces the amount of usable TLBs to 28 (ie by 12%). That's the
reason why we make it selectable.
This option does nothing, it just activate the selection of what
to pin.
config PIN_TLB_DATA
bool "Pinned TLB for DATA"
depends on PIN_TLB
default y
help
This pins the first 32 Mbytes of memory with 8M pages.
config PIN_TLB_IMMR
bool "Pinned TLB for IMMR"
depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
default y
help
This pins the IMMR area with a 512kbytes page. In case
CONFIG_PIN_TLB_DATA is also selected, it will reduce
CONFIG_PIN_TLB_DATA to 24 Mbytes.
config PIN_TLB_TEXT
bool "Pinned TLB for TEXT"
depends on PIN_TLB
default y
help
This pins kernel text with 8M pages.
endmenu
endmenu