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powerpc/8xx: Always pin kernel text TLB

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There is no big poing in not pinning kernel text anymore, as now
we can keep pinned TLB even with things like DEBUG_PAGEALLOC.

Remove CONFIG_PIN_TLB_TEXT, making it always right.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Drop ifdef around mmu_pin_tlb() to fix build errors]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/203b89de491e1379f1677a2685211b7c32adfff0.1606231483.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-11-24 15:24:55 +00:00 committed by Michael Ellerman
parent 613df979da
commit bccc58986a
4 changed files with 5 additions and 30 deletions
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3
arch/powerpc/Kconfig
View File

@ -808,8 +808,7 @@ config DATA_SHIFT_BOOL
bool "Set custom data alignment"
depends on ADVANCED_OPTIONS
depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
(!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
help
This option allows you to set the kernel data alignment. When
RAM is mapped by blocks, the alignment needs to fit the size and

22
arch/powerpc/kernel/head_8xx.S
View File

@ -42,15 +42,6 @@
#endif
.endm
/*
* We need an ITLB miss handler for kernel addresses if:
* - Either we have modules
* - Or we have not pinned the first 8M
*/
#if defined(CONFIG_MODULES) || !defined(CONFIG_PIN_TLB_TEXT)
#define ITLB_MISS_KERNEL 1
#endif
/*
* Value for the bits that have fixed value in RPN entries.
* Also used for tagging DAR for DTLBerror.
@ -209,12 +200,12 @@ InstructionTLBMiss:
mfspr r10, SPRN_SRR0 /* Get effective address of fault */
INVALIDATE_ADJACENT_PAGES_CPU15(r10)
mtspr SPRN_MD_EPN, r10
#ifdef ITLB_MISS_KERNEL
#ifdef CONFIG_MODULES
mfcr r11
compare_to_kernel_boundary r10, r10
#endif
mfspr r10, SPRN_M_TWB /* Get level 1 table */
#ifdef ITLB_MISS_KERNEL
#ifdef CONFIG_MODULES
blt+ 3f
rlwinm r10, r10, 0, 20, 31
oris r10, r10, (swapper_pg_dir - PAGE_OFFSET)@ha
@ -618,10 +609,6 @@ start_here:
lis r0, (MD_TWAM | MD_RSV4I)@h
mtspr SPRN_MD_CTR, r0
#endif
#ifndef CONFIG_PIN_TLB_TEXT
li r0, 0
mtspr SPRN_MI_CTR, r0
#endif
#if !defined(CONFIG_PIN_TLB_DATA) && !defined(CONFIG_PIN_TLB_IMMR)
lis r0, MD_TWAM@h
mtspr SPRN_MD_CTR, r0
@ -717,7 +704,6 @@ initial_mmu:
mtspr SPRN_DER, r8
blr
#ifdef CONFIG_PIN_TLB
_GLOBAL(mmu_pin_tlb)
lis r9, (1f - PAGE_OFFSET)@h
ori r9, r9, (1f - PAGE_OFFSET)@l
@ -739,7 +725,6 @@ _GLOBAL(mmu_pin_tlb)
mtspr SPRN_MD_CTR, r6
tlbia
#ifdef CONFIG_PIN_TLB_TEXT
LOAD_REG_IMMEDIATE(r5, 28 << 8)
LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET)
LOAD_REG_IMMEDIATE(r7, MI_SVALID | MI_PS8MEG | _PMD_ACCESSED)
@ -760,7 +745,7 @@ _GLOBAL(mmu_pin_tlb)
bdnzt lt, 2b
lis r0, MI_RSV4I@h
mtspr SPRN_MI_CTR, r0
#endif
LOAD_REG_IMMEDIATE(r5, 28 << 8 | MD_TWAM)
#ifdef CONFIG_PIN_TLB_DATA
LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET)
@ -818,7 +803,6 @@ _GLOBAL(mmu_pin_tlb)
mtspr SPRN_SRR1, r10
mtspr SPRN_SRR0, r11
rfi
#endif /* CONFIG_PIN_TLB */
/*
* We put a few things here that have to be page-aligned.

3
arch/powerpc/mm/nohash/8xx.c
View File

@ -186,8 +186,7 @@ void mmu_mark_initmem_nx(void)
mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, false);
mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false);
if (IS_ENABLED(CONFIG_PIN_TLB_TEXT))
mmu_pin_tlb(block_mapped_ram, false);
mmu_pin_tlb(block_mapped_ram, false);
}
#ifdef CONFIG_STRICT_KERNEL_RWX

7
arch/powerpc/platforms/8xx/Kconfig
View File

@ -194,13 +194,6 @@ config PIN_TLB_IMMR
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
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