From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v7 10/16] powerpc/8xx: Temporarily disable 16k pages and hugepages
Date: Wed, 28 Nov 2018 11:46:41 +0000 (UTC) [thread overview]
Message-ID: <3df3b7710a4c8aa7b0cd78f6b478cb98f9c73f64.1543405086.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1543405086.git.christophe.leroy@c-s.fr>
In preparation of making use of hardware assistance in TLB handlers,
this patch temporarily disables 16K pages and hugepages. The reason
is that when using HW assistance in 4K pages mode, the linux model
fit with the HW model for 4K pages and 8M pages.
However for 16K pages and 512K mode some additional work is needed
to get linux model fit with HW model.
For the 8M pages, they will naturaly come back when we switch to
HW assistance, without any additional handling.
In order to keep the following patch smaller, the removal of the
current special handling for 8M pages gets removed here as well.
Therefore the 4K pages mode will be implemented first and without
support for 512k hugepages. Then the 512k hugepages will be brought
back. And the 16K pages will be implemented in the following step.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/head_8xx.S | 74 +++---------------------------------------
arch/powerpc/mm/tlb_nohash.c | 6 ----
3 files changed, 6 insertions(+), 76 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8be31261aec8..ddfccdf004fe 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -689,7 +689,7 @@ config PPC_4K_PAGES
config PPC_16K_PAGES
bool "16k page size"
- depends on 44x || PPC_8xx
+ depends on 44x
config PPC_64K_PAGES
bool "64k page size"
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index c203defe49a4..01f58b1d9ae7 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -314,7 +314,7 @@ SystemCall:
InstructionTLBMiss:
mtspr SPRN_SPRG_SCRATCH0, r10
mtspr SPRN_SPRG_SCRATCH1, r11
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_HUGETLB_PAGE)
+#ifdef ITLB_MISS_KERNEL
mtspr SPRN_SPRG_SCRATCH2, r12
#endif
@@ -325,10 +325,8 @@ InstructionTLBMiss:
INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
/* Only modules will cause ITLB Misses as we always
* pin the first 8MB of kernel memory */
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_HUGETLB_PAGE)
- mfcr r12
-#endif
#ifdef ITLB_MISS_KERNEL
+ mfcr r12
#if defined(SIMPLE_KERNEL_ADDRESS) && defined(CONFIG_PIN_TLB_TEXT)
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
#else
@@ -360,15 +358,9 @@ InstructionTLBMiss:
/* Extract level 2 index */
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
-#ifdef CONFIG_HUGETLB_PAGE
- mtcr r11
- bt- 28, 10f /* bit 28 = Large page (8M) */
- bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
-#endif
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
lwz r10, 0(r10) /* Get the pte */
-4:
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_HUGETLB_PAGE)
+#ifdef ITLB_MISS_KERNEL
mtcr r12
#endif
/* Load the MI_TWC with the attributes for this "segment." */
@@ -393,7 +385,7 @@ InstructionTLBMiss:
/* Restore registers */
0: mfspr r10, SPRN_SPRG_SCRATCH0
mfspr r11, SPRN_SPRG_SCRATCH1
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_HUGETLB_PAGE)
+#ifdef ITLB_MISS_KERNEL
mfspr r12, SPRN_SPRG_SCRATCH2
#endif
rfi
@@ -406,35 +398,12 @@ InstructionTLBMiss:
stw r10, (itlb_miss_counter - PAGE_OFFSET)@l(0)
mfspr r10, SPRN_SPRG_SCRATCH0
mfspr r11, SPRN_SPRG_SCRATCH1
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_HUGETLB_PAGE)
+#ifdef ITLB_MISS_KERNEL
mfspr r12, SPRN_SPRG_SCRATCH2
#endif
rfi
#endif
-#ifdef CONFIG_HUGETLB_PAGE
-10: /* 8M pages */
-#ifdef CONFIG_PPC_16K_PAGES
- /* Extract level 2 index */
- rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
- /* Add level 2 base */
- rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
-#else
- /* Level 2 base */
- rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
-#endif
- lwz r10, 0(r10) /* Get the pte */
- b 4b
-
-20: /* 512k pages */
- /* Extract level 2 index */
- rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
- /* Add level 2 base */
- rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
- lwz r10, 0(r10) /* Get the pte */
- b 4b
-#endif
-
. = 0x1200
DataStoreTLBMiss:
mtspr SPRN_SPRG_SCRATCH0, r10
@@ -472,11 +441,6 @@ DataStoreTLBMiss:
*/
/* Extract level 2 index */
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
-#ifdef CONFIG_HUGETLB_PAGE
- mtcr r11
- bt- 28, 10f /* bit 28 = Large page (8M) */
- bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
-#endif
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
lwz r10, 0(r10) /* Get the pte */
4:
@@ -534,29 +498,6 @@ DataStoreTLBMiss:
rfi
#endif
-#ifdef CONFIG_HUGETLB_PAGE
-10: /* 8M pages */
- /* Extract level 2 index */
-#ifdef CONFIG_PPC_16K_PAGES
- rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
- /* Add level 2 base */
- rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
-#else
- /* Level 2 base */
- rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
-#endif
- lwz r10, 0(r10) /* Get the pte */
- b 4b
-
-20: /* 512k pages */
- /* Extract level 2 index */
- rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
- /* Add level 2 base */
- rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
- lwz r10, 0(r10) /* Get the pte */
- b 4b
-#endif
-
/* This is an instruction TLB error on the MPC8xx. This could be due
* to many reasons, such as executing guarded memory or illegal instruction
* addresses. There is nothing to do but handle a big time error fault.
@@ -773,12 +714,7 @@ FixupDAR:/* Entry point for dcbx workaround. */
/* concat physical page address(r11) and page offset(r10) */
200:
-#ifdef CONFIG_PPC_16K_PAGES
- rlwinm r11, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
- rlwimi r11, r10, 32 - (PAGE_SHIFT_8M - 2), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
-#else
rlwinm r11, r10, 0, ~HUGEPD_SHIFT_MASK
-#endif
lwz r11, 0(r11) /* Get the pte */
/* concat physical page address(r11) and page offset(r10) */
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index ae5d568e267f..4f79639e432f 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -97,12 +97,6 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
.shift = 14,
},
#endif
- [MMU_PAGE_512K] = {
- .shift = 19,
- },
- [MMU_PAGE_8M] = {
- .shift = 23,
- },
};
#else
struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
--
2.13.3
next prev parent reply other threads:[~2018-11-28 11:46 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 11:46 [PATCH v7 00/16] Implement use of HW assistance on TLB table walk on 8xx Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 01/16] powerpc/book3s32: Remove CONFIG_BOOKE dependent code Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 02/16] powerpc/8xx: Remove PTE_ATOMIC_UPDATES Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 03/16] powerpc/mm: Move pte_fragment_alloc() to a common location Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 04/16] powerpc/mm: Avoid useless lock with single page fragments Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 05/16] powerpc/mm: move platform specific mmu-xxx.h in platform directories Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 06/16] powerpc/mm: Move pgtable_t into platform headers Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 07/16] powerpc/mm: add helpers to get/set mm.context->pte_frag Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 08/16] powerpc/mm: Extend pte_fragment functionality to PPC32 Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 09/16] powerpc/8xx: Move SW perf counters in first 32kb of memory Christophe Leroy
2018-11-28 11:46 ` Christophe Leroy [this message]
2018-11-28 11:46 ` [PATCH v7 11/16] powerpc/mm: Use hardware assistance in TLB handlers on the 8xx Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 12/16] powerpc/mm: Enable 8M hugepage support with HW assistance " Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 13/16] powerpc/mm: Enable 512k " Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 14/16] powerpc/mm: reintroduce 16K pages with HW assistance on 8xx Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 15/16] powerpc/8xx: don't use r12/SPRN_SPRG_SCRATCH2 in TLB Miss handlers Christophe Leroy
2018-11-28 11:46 ` [PATCH v7 16/16] powerpc/8xx: regroup TLB handler routines Christophe Leroy
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