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Message-Id: <4c54997edd3548fa54717915e7c6ebaf60f208c0.1622712515.git.christophe.leroy@csgroup.eu>
Date: Thu, 3 Jun 2021 09:29:02 +0000 (UTC)
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3 1/6] powerpc/nohash: Refactor update of BDI2000 pointers in
switch_mmu_context()
Instead of duplicating the update of BDI2000 pointers in
set_context(), do it directly from switch_mmu_context().
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v3: Do it only for nohash platforms, book3s/32 will have its own as part of converting switch_mmu_context() to C.
---
arch/powerpc/kernel/head_40x.S | 14 --------------
arch/powerpc/kernel/head_44x.S | 16 ----------------
arch/powerpc/kernel/head_8xx.S | 7 -------
arch/powerpc/kernel/head_book3s_32.S | 6 ------
arch/powerpc/kernel/head_fsl_booke.S | 16 ----------------
arch/powerpc/mm/nohash/8xx.c | 6 ------
arch/powerpc/mm/nohash/mmu_context.c | 8 ++++++++
arch/powerpc/mm/nohash/tlb_low.S | 8 --------
8 files changed, 8 insertions(+), 73 deletions(-)
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index e1360b88b6cb..7ef1bbc23bed 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -703,14 +703,6 @@ _GLOBAL(abort)
mtspr SPRN_DBCR0,r13
_GLOBAL(set_context)
-
-#ifdef CONFIG_BDI_SWITCH
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is the second parameter.
- */
- lis r5, abatron_pteptrs@ha
- stw r4, abatron_pteptrs@l + 0x4(r5)
-#endif
sync
mtspr SPRN_PID,r3
isync /* Need an isync to flush shadow */
@@ -731,9 +723,3 @@ EXPORT_SYMBOL(empty_zero_page)
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
-
-/* Room for two PTE pointers, usually the kernel and current user pointers
- * to their respective root page table.
- */
-abatron_pteptrs:
- .space 8
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 5c106ac36626..57509d90e409 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -781,15 +781,6 @@ _GLOBAL(__fixup_440A_mcheck)
blr
_GLOBAL(set_context)
-
-#ifdef CONFIG_BDI_SWITCH
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is the second parameter.
- */
- lis r5, abatron_pteptrs@h
- ori r5, r5, abatron_pteptrs@l
- stw r4, 0x4(r5)
-#endif
mtspr SPRN_PID,r3
isync /* Force context change */
blr
@@ -1259,13 +1250,6 @@ EXPORT_SYMBOL(empty_zero_page)
swapper_pg_dir:
.space PGD_TABLE_SIZE
-/*
- * Room for two PTE pointers, usually the kernel and current user pointers
- * to their respective root page table.
- */
-abatron_pteptrs:
- .space 8
-
#ifdef CONFIG_SMP
.align 12
temp_boot_stack:
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 7d445e4342c0..817df9fe7fb3 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -804,10 +804,3 @@ EXPORT_SYMBOL(empty_zero_page)
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
-
-/* Room for two PTE table pointers, usually the kernel and current user
- * pointer to their respective root page table (pgdir).
- */
- .globl abatron_pteptrs
-abatron_pteptrs:
- .space 8
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 326262030279..32c27dac9b80 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -1282,9 +1282,3 @@ EXPORT_SYMBOL(empty_zero_page)
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
-
-/* Room for two PTE pointers, usually the kernel and current user pointers
- * to their respective root page table.
- */
-abatron_pteptrs:
- .space 8
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index a1a5c3f10dc4..590f34cc5bb2 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -986,15 +986,6 @@ _GLOBAL(abort)
isync
_GLOBAL(set_context)
-
-#ifdef CONFIG_BDI_SWITCH
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is the second parameter.
- */
- lis r5, abatron_pteptrs@h
- ori r5, r5, abatron_pteptrs@l
- stw r4, 0x4(r5)
-#endif
mtspr SPRN_PID,r3
isync /* Force context change */
blr
@@ -1242,10 +1233,3 @@ EXPORT_SYMBOL(empty_zero_page)
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
-
-/*
- * Room for two PTE pointers, usually the kernel and current user pointers
- * to their respective root page table.
- */
-abatron_pteptrs:
- .space 8
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c
index 71bfdbedacee..f749acba5473 100644
--- a/arch/powerpc/mm/nohash/8xx.c
+++ b/arch/powerpc/mm/nohash/8xx.c
@@ -224,12 +224,6 @@ void set_context(unsigned long id, pgd_t *pgd)
{
s16 offset = (s16)(__pa(swapper_pg_dir));
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is passed as second argument.
- */
- if (IS_ENABLED(CONFIG_BDI_SWITCH))
- abatron_pteptrs[1] = pgd;
-
/* Register M_TWB will contain base address of level 1 table minus the
* lower part of the kernel PGDIR base address, so that all accesses to
* level 1 table are done relative to lower part of kernel PGDIR base
diff --git a/arch/powerpc/mm/nohash/mmu_context.c b/arch/powerpc/mm/nohash/mmu_context.c
index aac81c9f84a5..eae48635a9ac 100644
--- a/arch/powerpc/mm/nohash/mmu_context.c
+++ b/arch/powerpc/mm/nohash/mmu_context.c
@@ -50,6 +50,12 @@
#include <mm/mmu_decl.h>
+/*
+ * Room for two PTE table pointers, usually the kernel and current user
+ * pointer to their respective root page table (pgdir).
+ */
+void *abatron_pteptrs[2];
+
/*
* The MPC8xx has only 16 contexts. We rotate through them on each task switch.
* A better way would be to keep track of tasks that own contexts, and implement
@@ -357,6 +363,8 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
/* Flick the MMU and release lock */
pr_hardcont(" -> %d\n", id);
+ if (IS_ENABLED(CONFIG_BDI_SWITCH))
+ abatron_pteptrs[1] = next->pgd;
set_context(id, next->pgd);
raw_spin_unlock(&context_lock);
}
diff --git a/arch/powerpc/mm/nohash/tlb_low.S b/arch/powerpc/mm/nohash/tlb_low.S
index 68797e072f55..b3d0f0127828 100644
--- a/arch/powerpc/mm/nohash/tlb_low.S
+++ b/arch/powerpc/mm/nohash/tlb_low.S
@@ -362,14 +362,6 @@ _GLOBAL(_tlbivax_bcast)
blr
_GLOBAL(set_context)
-#ifdef CONFIG_BDI_SWITCH
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is the second parameter.
- */
- lis r5, abatron_pteptrs@h
- ori r5, r5, abatron_pteptrs@l
- stw r4, 0x4(r5)
-#endif
mtspr SPRN_PID,r3
isync /* Force context change */
blr
--
2.25.0
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