* [PATCH v2 1/6] powerpc/64s: move stack SLB pinning out of line from _switch
2023-05-15 4:45 [PATCH v2 0/6] powerpc: merge _switch in 32/64 Nicholas Piggin
@ 2023-05-15 4:45 ` Nicholas Piggin
2023-05-15 4:45 ` [PATCH v2 2/6] powerpc/64: Rearrange 64-bit _switch to prepare for 32/64 merge Nicholas Piggin
` (4 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Nicholas Piggin @ 2023-05-15 4:45 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
The large hunk of SLB pinning in _switch asm code makes it more
difficult to see everything else that's going on. Also the code
footprint of the increasingly less important path is likely to
take up icache footprint and fetch.
Move it out of line.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/entry_64.S | 113 ++++++++++++++++++---------------
1 file changed, 62 insertions(+), 51 deletions(-)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 1bf1121e17f1..2e02834c5824 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -105,6 +105,64 @@ flush_branch_caches:
.endr
blr
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+.balign 32
+/*
+ * New stack pointer in r8, old stack pointer in r1, must not clobber r3
+ */
+pin_stack_slb:
+BEGIN_FTR_SECTION
+ clrrdi r6,r8,28 /* get its ESID */
+ clrrdi r9,r1,28 /* get current sp ESID */
+FTR_SECTION_ELSE
+ clrrdi r6,r8,40 /* get its 1T ESID */
+ clrrdi r9,r1,40 /* get current sp 1T ESID */
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_1T_SEGMENT)
+ clrldi. r0,r6,2 /* is new ESID c00000000? */
+ cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
+ cror eq,4*cr1+eq,eq
+ beq 2f /* if yes, don't slbie it */
+
+ /* Bolt in the new stack SLB entry */
+ ld r7,KSP_VSID(r4) /* Get new stack's VSID */
+ oris r0,r6,(SLB_ESID_V)@h
+ ori r0,r0,(SLB_NUM_BOLTED-1)@l
+BEGIN_FTR_SECTION
+ li r9,MMU_SEGSIZE_1T /* insert B field */
+ oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h
+ rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0
+END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
+
+ /* Update the last bolted SLB. No write barriers are needed
+ * here, provided we only update the current CPU's SLB shadow
+ * buffer.
+ */
+ ld r9,PACA_SLBSHADOWPTR(r13)
+ li r12,0
+ std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
+ li r12,SLBSHADOW_STACKVSID
+ STDX_BE r7,r12,r9 /* Save VSID */
+ li r12,SLBSHADOW_STACKESID
+ STDX_BE r0,r12,r9 /* Save ESID */
+
+ /* No need to check for MMU_FTR_NO_SLBIE_B here, since when
+ * we have 1TB segments, the only CPUs known to have the errata
+ * only support less than 1TB of system memory and we'll never
+ * actually hit this code path.
+ */
+
+ isync
+ slbie r6
+BEGIN_FTR_SECTION
+ slbie r6 /* Workaround POWER5 < DD2.1 issue */
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
+ slbmte r7,r0
+ isync
+2: blr
+ .size pin_stack_slb,.-pin_stack_slb
+#endif /* CONFIG_PPC_64S_HASH_MMU */
+
#else
#define FLUSH_COUNT_CACHE
#endif /* CONFIG_PPC_BOOK3S_64 */
@@ -182,59 +240,12 @@ _GLOBAL(_switch)
#endif
ld r8,KSP(r4) /* new stack pointer */
+
#ifdef CONFIG_PPC_64S_HASH_MMU
BEGIN_MMU_FTR_SECTION
- b 2f
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX)
-BEGIN_FTR_SECTION
- clrrdi r6,r8,28 /* get its ESID */
- clrrdi r9,r1,28 /* get current sp ESID */
-FTR_SECTION_ELSE
- clrrdi r6,r8,40 /* get its 1T ESID */
- clrrdi r9,r1,40 /* get current sp 1T ESID */
-ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_1T_SEGMENT)
- clrldi. r0,r6,2 /* is new ESID c00000000? */
- cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
- cror eq,4*cr1+eq,eq
- beq 2f /* if yes, don't slbie it */
-
- /* Bolt in the new stack SLB entry */
- ld r7,KSP_VSID(r4) /* Get new stack's VSID */
- oris r0,r6,(SLB_ESID_V)@h
- ori r0,r0,(SLB_NUM_BOLTED-1)@l
-BEGIN_FTR_SECTION
- li r9,MMU_SEGSIZE_1T /* insert B field */
- oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h
- rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
-
- /* Update the last bolted SLB. No write barriers are needed
- * here, provided we only update the current CPU's SLB shadow
- * buffer.
- */
- ld r9,PACA_SLBSHADOWPTR(r13)
- li r12,0
- std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
- li r12,SLBSHADOW_STACKVSID
- STDX_BE r7,r12,r9 /* Save VSID */
- li r12,SLBSHADOW_STACKESID
- STDX_BE r0,r12,r9 /* Save ESID */
-
- /* No need to check for MMU_FTR_NO_SLBIE_B here, since when
- * we have 1TB segments, the only CPUs known to have the errata
- * only support less than 1TB of system memory and we'll never
- * actually hit this code path.
- */
-
- isync
- slbie r6
-BEGIN_FTR_SECTION
- slbie r6 /* Workaround POWER5 < DD2.1 issue */
-END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
- slbmte r7,r0
- isync
-2:
-#endif /* CONFIG_PPC_64S_HASH_MMU */
+ bl pin_stack_slb
+END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
+#endif
clrrdi r7, r8, THREAD_SHIFT /* base of new stack */
/* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
--
2.40.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v2 2/6] powerpc/64: Rearrange 64-bit _switch to prepare for 32/64 merge
2023-05-15 4:45 [PATCH v2 0/6] powerpc: merge _switch in 32/64 Nicholas Piggin
2023-05-15 4:45 ` [PATCH v2 1/6] powerpc/64s: move stack SLB pinning out of line from _switch Nicholas Piggin
@ 2023-05-15 4:45 ` Nicholas Piggin
2023-05-15 4:45 ` [PATCH v2 3/6] powerpc/32: Remove sync from _switch Nicholas Piggin
` (3 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Nicholas Piggin @ 2023-05-15 4:45 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
More some 64-bit specifics out from the function epilogue and rearrange
this to be a bit neater, use 32-bit mem ops for CR save/restore, and
change some register numbers.
---
arch/powerpc/kernel/entry_64.S | 38 ++++++++++++++++------------------
1 file changed, 18 insertions(+), 20 deletions(-)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2e02834c5824..7430bd020a2a 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -190,12 +190,13 @@ _GLOBAL(_switch)
mflr r0
std r0,16(r1)
stdu r1,-SWITCH_FRAME_SIZE(r1)
+ std r1,KSP(r3) /* Set old stack pointer */
/* r3-r13 are caller saved -- Cort */
SAVE_NVGPRS(r1)
std r0,_NIP(r1) /* Return to switch caller */
- mfcr r23
- std r23,_CCR(r1)
- std r1,KSP(r3) /* Set old stack pointer */
+ mfcr r0
+ stw r0,_CCR(r1)
+ ld r8,KSP(r4) /* Load new stack pointer */
kuap_check_amr r9, r10
@@ -232,14 +233,20 @@ _GLOBAL(_switch)
DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r6)
#endif
- addi r6,r4,-THREAD /* Convert THREAD to 'current' */
- std r6,PACACURRENT(r13) /* Set new 'current' */
+ addi r3,r3,-THREAD /* old thread -> task_struct for return value */
+ addi r6,r4,-THREAD /* new thread -> task_struct */
+ std r6,PACACURRENT(r13) /* Set new task_struct to 'current' */
#if defined(CONFIG_STACKPROTECTOR)
ld r6, TASK_CANARY(r6)
std r6, PACA_CANARY(r13)
#endif
-
- ld r8,KSP(r4) /* new stack pointer */
+ /* Set the new PACAKSAVE */
+ clrrdi r7, r8, THREAD_SHIFT /* base of new stack */
+ /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
+ because we don't need to leave the 288-byte ABI gap at the
+ top of the kernel stack. */
+ addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE
+ std r7,PACAKSAVE(r13)
#ifdef CONFIG_PPC_64S_HASH_MMU
BEGIN_MMU_FTR_SECTION
@@ -247,12 +254,6 @@ BEGIN_MMU_FTR_SECTION
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
#endif
- clrrdi r7, r8, THREAD_SHIFT /* base of new stack */
- /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
- because we don't need to leave the 288-byte ABI gap at the
- top of the kernel stack. */
- addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE
-
/*
* PMU interrupts in radix may come in here. They will use r1, not
* PACAKSAVE, so this stack switch will not cause a problem. They
@@ -262,18 +263,15 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
* active on the new CPU, will order those stores.
*/
mr r1,r8 /* start using new stack pointer */
- std r7,PACAKSAVE(r13)
- ld r6,_CCR(r1)
- mtcrf 0xFF,r6
+ lwz r0,_CCR(r1)
+ mtcrf 0xFF,r0
/* r3-r13 are destroyed -- Cort */
REST_NVGPRS(r1)
- /* convert old thread to its task_struct for return value */
- addi r3,r3,-THREAD
- ld r7,_NIP(r1) /* Return to _switch caller in new task */
- mtlr r7
+ ld r0,_NIP(r1) /* Return to _switch caller in new task */
+ mtlr r0
addi r1,r1,SWITCH_FRAME_SIZE
blr
--
2.40.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v2 5/6] powerpc: merge 32-bit and 64-bit _switch implementation
2023-05-15 4:45 [PATCH v2 0/6] powerpc: merge _switch in 32/64 Nicholas Piggin
` (3 preceding siblings ...)
2023-05-15 4:45 ` [PATCH v2 4/6] powerpc/32: Rearrange _switch to prepare for 32/64 merge Nicholas Piggin
@ 2023-05-15 4:45 ` Nicholas Piggin
2023-05-15 4:45 ` [PATCH v2 6/6] powerpc/64: Rename entry_64.S to prom_entry_64.S Nicholas Piggin
5 siblings, 0 replies; 9+ messages in thread
From: Nicholas Piggin @ 2023-05-15 4:45 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
The _switch stack frame setup are substantially the same, so are the
comments. The difference in how the stack and current are switched,
and other hardware and software housekeeping is done is moved into
macros.
Generated code should be unchanged.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/Makefile | 2 +-
arch/powerpc/kernel/entry_32.S | 52 -------
arch/powerpc/kernel/entry_64.S | 229 ---------------------------
arch/powerpc/kernel/switch.S | 274 +++++++++++++++++++++++++++++++++
4 files changed, 275 insertions(+), 282 deletions(-)
create mode 100644 arch/powerpc/kernel/switch.S
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 9bf2be123093..ec70a1748506 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -68,7 +68,7 @@ CFLAGS_REMOVE_syscall.o = -fstack-protector -fstack-protector-strong
CFLAGS_syscall.o += -fno-stack-protector
#endif
-obj-y := cputable.o syscalls.o \
+obj-y := cputable.o syscalls.o switch.o \
irq.o align.o signal_$(BITS).o pmc.o vdso.o \
process.o systbl.o idle.o \
signal.o sysfs.o cacheinfo.o time.o \
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 2d17b14bb9e5..fe27d41f9a3d 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -211,58 +211,6 @@ start_kernel_thread:
100: trap
EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,0
-
-/*
- * This routine switches between two different tasks. The process
- * state of one is saved on its kernel stack. Then the state
- * of the other is restored from its kernel stack. The memory
- * management hardware is updated to the second process's state.
- * Finally, we can return to the second process.
- * On entry, r3 points to the THREAD for the current task, r4
- * points to the THREAD for the new task.
- *
- * This routine is always called with interrupts disabled.
- *
- * Note: there are two ways to get to the "going out" portion
- * of this code; either by coming in via the entry (_switch)
- * or via "fork" which must set up an environment equivalent
- * to the "_switch" path. If you change this , you'll have to
- * change the fork code also.
- *
- * The code which creates the new task context is in 'copy_thread'
- * in arch/ppc/kernel/process.c
- */
-_GLOBAL(_switch)
- stwu r1,-SWITCH_FRAME_SIZE(r1)
- mflr r0
- stw r0,SWITCH_FRAME_SIZE+4(r1)
- stw r1,KSP(r3) /* Set old stack pointer */
- /* r3-r12 are caller saved -- Cort */
- SAVE_NVGPRS(r1)
- stw r0,_NIP(r1) /* Return to switch caller */
- mfcr r0
- stw r0,_CCR(r1)
-
- /* The sync for SMP migration is taken care of, see entry_64.S */
-
- tophys(r0,r4)
- mtspr SPRN_SPRG_THREAD,r0 /* Update current THREAD phys addr */
- lwz r1,KSP(r4) /* Load new stack pointer */
-
- /* save the old current 'last' for return value */
- mr r3,r2
- addi r2,r4,-THREAD /* Update current */
-
- lwz r0,_CCR(r1)
- mtcrf 0xFF,r0
- /* r3-r12 are destroyed -- Cort */
- REST_NVGPRS(r1)
-
- lwz r0,_NIP(r1) /* Return to _switch caller in new task */
- mtlr r0
- addi r1,r1,SWITCH_FRAME_SIZE
- blr
-
.globl fast_exception_return
fast_exception_return:
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 7430bd020a2a..f3d3885ee9fd 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -14,7 +14,6 @@
* code, and exception/interrupt return code for PowerPC.
*/
-#include <linux/objtool.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <asm/cache.h>
@@ -45,236 +44,8 @@
#include <asm/feature-fixups.h>
#include <asm/kup.h>
-/*
- * System calls.
- */
.section ".text"
-#ifdef CONFIG_PPC_BOOK3S_64
-
-#define FLUSH_COUNT_CACHE \
-1: nop; \
- patch_site 1b, patch__call_flush_branch_caches1; \
-1: nop; \
- patch_site 1b, patch__call_flush_branch_caches2; \
-1: nop; \
- patch_site 1b, patch__call_flush_branch_caches3
-
-.macro nops number
- .rept \number
- nop
- .endr
-.endm
-
-.balign 32
-.global flush_branch_caches
-flush_branch_caches:
- /* Save LR into r9 */
- mflr r9
-
- // Flush the link stack
- .rept 64
- ANNOTATE_INTRA_FUNCTION_CALL
- bl .+4
- .endr
- b 1f
- nops 6
-
- .balign 32
- /* Restore LR */
-1: mtlr r9
-
- // If we're just flushing the link stack, return here
-3: nop
- patch_site 3b patch__flush_link_stack_return
-
- li r9,0x7fff
- mtctr r9
-
- PPC_BCCTR_FLUSH
-
-2: nop
- patch_site 2b patch__flush_count_cache_return
-
- nops 3
-
- .rept 278
- .balign 32
- PPC_BCCTR_FLUSH
- nops 7
- .endr
-
- blr
-
-#ifdef CONFIG_PPC_64S_HASH_MMU
-.balign 32
-/*
- * New stack pointer in r8, old stack pointer in r1, must not clobber r3
- */
-pin_stack_slb:
-BEGIN_FTR_SECTION
- clrrdi r6,r8,28 /* get its ESID */
- clrrdi r9,r1,28 /* get current sp ESID */
-FTR_SECTION_ELSE
- clrrdi r6,r8,40 /* get its 1T ESID */
- clrrdi r9,r1,40 /* get current sp 1T ESID */
-ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_1T_SEGMENT)
- clrldi. r0,r6,2 /* is new ESID c00000000? */
- cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
- cror eq,4*cr1+eq,eq
- beq 2f /* if yes, don't slbie it */
-
- /* Bolt in the new stack SLB entry */
- ld r7,KSP_VSID(r4) /* Get new stack's VSID */
- oris r0,r6,(SLB_ESID_V)@h
- ori r0,r0,(SLB_NUM_BOLTED-1)@l
-BEGIN_FTR_SECTION
- li r9,MMU_SEGSIZE_1T /* insert B field */
- oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h
- rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
-
- /* Update the last bolted SLB. No write barriers are needed
- * here, provided we only update the current CPU's SLB shadow
- * buffer.
- */
- ld r9,PACA_SLBSHADOWPTR(r13)
- li r12,0
- std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
- li r12,SLBSHADOW_STACKVSID
- STDX_BE r7,r12,r9 /* Save VSID */
- li r12,SLBSHADOW_STACKESID
- STDX_BE r0,r12,r9 /* Save ESID */
-
- /* No need to check for MMU_FTR_NO_SLBIE_B here, since when
- * we have 1TB segments, the only CPUs known to have the errata
- * only support less than 1TB of system memory and we'll never
- * actually hit this code path.
- */
-
- isync
- slbie r6
-BEGIN_FTR_SECTION
- slbie r6 /* Workaround POWER5 < DD2.1 issue */
-END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
- slbmte r7,r0
- isync
-2: blr
- .size pin_stack_slb,.-pin_stack_slb
-#endif /* CONFIG_PPC_64S_HASH_MMU */
-
-#else
-#define FLUSH_COUNT_CACHE
-#endif /* CONFIG_PPC_BOOK3S_64 */
-
-/*
- * This routine switches between two different tasks. The process
- * state of one is saved on its kernel stack. Then the state
- * of the other is restored from its kernel stack. The memory
- * management hardware is updated to the second process's state.
- * Finally, we can return to the second process, via interrupt_return.
- * On entry, r3 points to the THREAD for the current task, r4
- * points to the THREAD for the new task.
- *
- * Note: there are two ways to get to the "going out" portion
- * of this code; either by coming in via the entry (_switch)
- * or via "fork" which must set up an environment equivalent
- * to the "_switch" path. If you change this you'll have to change
- * the fork code also.
- *
- * The code which creates the new task context is in 'copy_thread'
- * in arch/powerpc/kernel/process.c
- */
- .align 7
-_GLOBAL(_switch)
- mflr r0
- std r0,16(r1)
- stdu r1,-SWITCH_FRAME_SIZE(r1)
- std r1,KSP(r3) /* Set old stack pointer */
- /* r3-r13 are caller saved -- Cort */
- SAVE_NVGPRS(r1)
- std r0,_NIP(r1) /* Return to switch caller */
- mfcr r0
- stw r0,_CCR(r1)
- ld r8,KSP(r4) /* Load new stack pointer */
-
- kuap_check_amr r9, r10
-
- FLUSH_COUNT_CACHE /* Clobbers r9, ctr */
-
- /*
- * On SMP kernels, care must be taken because a task may be
- * scheduled off CPUx and on to CPUy. Memory ordering must be
- * considered.
- *
- * Cacheable stores on CPUx will be visible when the task is
- * scheduled on CPUy by virtue of the core scheduler barriers
- * (see "Notes on Program-Order guarantees on SMP systems." in
- * kernel/sched/core.c).
- *
- * Uncacheable stores in the case of involuntary preemption must
- * be taken care of. The smp_mb__after_spinlock() in __schedule()
- * is implemented as hwsync on powerpc, which orders MMIO too. So
- * long as there is an hwsync in the context switch path, it will
- * be executed on the source CPU after the task has performed
- * all MMIO ops on that CPU, and on the destination CPU before the
- * task performs any MMIO ops there.
- */
-
- /*
- * The kernel context switch path must contain a spin_lock,
- * which contains larx/stcx, which will clear any reservation
- * of the task being switched.
- */
-#ifdef CONFIG_PPC_BOOK3S
-/* Cancel all explict user streams as they will have no use after context
- * switch and will stop the HW from creating streams itself
- */
- DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r6)
-#endif
-
- addi r3,r3,-THREAD /* old thread -> task_struct for return value */
- addi r6,r4,-THREAD /* new thread -> task_struct */
- std r6,PACACURRENT(r13) /* Set new task_struct to 'current' */
-#if defined(CONFIG_STACKPROTECTOR)
- ld r6, TASK_CANARY(r6)
- std r6, PACA_CANARY(r13)
-#endif
- /* Set the new PACAKSAVE */
- clrrdi r7, r8, THREAD_SHIFT /* base of new stack */
- /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
- because we don't need to leave the 288-byte ABI gap at the
- top of the kernel stack. */
- addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE
- std r7,PACAKSAVE(r13)
-
-#ifdef CONFIG_PPC_64S_HASH_MMU
-BEGIN_MMU_FTR_SECTION
- bl pin_stack_slb
-END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
-#endif
-
- /*
- * PMU interrupts in radix may come in here. They will use r1, not
- * PACAKSAVE, so this stack switch will not cause a problem. They
- * will store to the process stack, which may then be migrated to
- * another CPU. However the rq lock release on this CPU paired with
- * the rq lock acquire on the new CPU before the stack becomes
- * active on the new CPU, will order those stores.
- */
- mr r1,r8 /* start using new stack pointer */
-
- lwz r0,_CCR(r1)
- mtcrf 0xFF,r0
-
- /* r3-r13 are destroyed -- Cort */
- REST_NVGPRS(r1)
-
- ld r0,_NIP(r1) /* Return to _switch caller in new task */
- mtlr r0
- addi r1,r1,SWITCH_FRAME_SIZE
- blr
-
_GLOBAL(enter_prom)
mflr r0
std r0,16(r1)
diff --git a/arch/powerpc/kernel/switch.S b/arch/powerpc/kernel/switch.S
new file mode 100644
index 000000000000..fae60dfa9e6e
--- /dev/null
+++ b/arch/powerpc/kernel/switch.S
@@ -0,0 +1,274 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include <linux/objtool.h>
+#include <asm/asm-offsets.h>
+#include <asm/code-patching-asm.h>
+#include <asm/kup.h>
+#include <asm/mmu.h>
+#include <asm/ppc_asm.h>
+#include <asm/thread_info.h>
+
+.section ".text","ax",@progbits
+
+#ifdef CONFIG_PPC_BOOK3S_64
+/*
+ * Cancel all explict user streams as they will have no use after context
+ * switch and will stop the HW from creating streams itself
+ */
+#define STOP_STREAMS \
+ DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r6)
+
+#define FLUSH_COUNT_CACHE \
+1: nop; \
+ patch_site 1b, patch__call_flush_branch_caches1; \
+1: nop; \
+ patch_site 1b, patch__call_flush_branch_caches2; \
+1: nop; \
+ patch_site 1b, patch__call_flush_branch_caches3
+
+.macro nops number
+ .rept \number
+ nop
+ .endr
+.endm
+
+.balign 32
+.global flush_branch_caches
+flush_branch_caches:
+ /* Save LR into r9 */
+ mflr r9
+
+ // Flush the link stack
+ .rept 64
+ ANNOTATE_INTRA_FUNCTION_CALL
+ bl .+4
+ .endr
+ b 1f
+ nops 6
+
+ .balign 32
+ /* Restore LR */
+1: mtlr r9
+
+ // If we're just flushing the link stack, return here
+3: nop
+ patch_site 3b patch__flush_link_stack_return
+
+ li r9,0x7fff
+ mtctr r9
+
+ PPC_BCCTR_FLUSH
+
+2: nop
+ patch_site 2b patch__flush_count_cache_return
+
+ nops 3
+
+ .rept 278
+ .balign 32
+ PPC_BCCTR_FLUSH
+ nops 7
+ .endr
+
+ blr
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+.balign 32
+/*
+ * New stack pointer in r8, old stack pointer in r1, must not clobber r3
+ */
+pin_stack_slb:
+BEGIN_FTR_SECTION
+ clrrdi r6,r8,28 /* get its ESID */
+ clrrdi r9,r1,28 /* get current sp ESID */
+FTR_SECTION_ELSE
+ clrrdi r6,r8,40 /* get its 1T ESID */
+ clrrdi r9,r1,40 /* get current sp 1T ESID */
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_1T_SEGMENT)
+ clrldi. r0,r6,2 /* is new ESID c00000000? */
+ cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
+ cror eq,4*cr1+eq,eq
+ beq 2f /* if yes, don't slbie it */
+
+ /* Bolt in the new stack SLB entry */
+ ld r7,KSP_VSID(r4) /* Get new stack's VSID */
+ oris r0,r6,(SLB_ESID_V)@h
+ ori r0,r0,(SLB_NUM_BOLTED-1)@l
+BEGIN_FTR_SECTION
+ li r9,MMU_SEGSIZE_1T /* insert B field */
+ oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h
+ rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0
+END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
+
+ /* Update the last bolted SLB. No write barriers are needed
+ * here, provided we only update the current CPU's SLB shadow
+ * buffer.
+ */
+ ld r9,PACA_SLBSHADOWPTR(r13)
+ li r12,0
+ std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
+ li r12,SLBSHADOW_STACKVSID
+ STDX_BE r7,r12,r9 /* Save VSID */
+ li r12,SLBSHADOW_STACKESID
+ STDX_BE r0,r12,r9 /* Save ESID */
+
+ /* No need to check for MMU_FTR_NO_SLBIE_B here, since when
+ * we have 1TB segments, the only CPUs known to have the errata
+ * only support less than 1TB of system memory and we'll never
+ * actually hit this code path.
+ */
+
+ isync
+ slbie r6
+BEGIN_FTR_SECTION
+ slbie r6 /* Workaround POWER5 < DD2.1 issue */
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
+ slbmte r7,r0
+ isync
+2: blr
+ .size pin_stack_slb,.-pin_stack_slb
+#endif /* CONFIG_PPC_64S_HASH_MMU */
+
+#else
+#define STOP_STREAMS
+#define FLUSH_COUNT_CACHE
+#endif /* CONFIG_PPC_BOOK3S_64 */
+
+/*
+ * do_switch_32/64 have the same calling convention as _switch, i.e., r3,r4
+ * are prev and next thread_struct, and returns prev task_struct.
+
+ * This switches the stack, current, and does other task switch housekeeping.
+ */
+.macro do_switch_32
+ tophys(r0,r4)
+ mtspr SPRN_SPRG_THREAD,r0 /* Update current THREAD phys addr */
+ lwz r1,KSP(r4) /* Load new stack pointer */
+
+ /* save the old current 'last' for return value */
+ mr r3,r2
+ addi r2,r4,-THREAD /* Update current */
+.endm
+
+.macro do_switch_64
+ ld r8,KSP(r4) /* Load new stack pointer */
+
+ kuap_check_amr r9, r10
+
+ FLUSH_COUNT_CACHE /* Clobbers r9, ctr */
+
+ STOP_STREAMS /* Clobbers r6 */
+
+ addi r3,r3,-THREAD /* old thread -> task_struct for return value */
+ addi r6,r4,-THREAD /* new thread -> task_struct */
+ std r6,PACACURRENT(r13) /* Set new task_struct to 'current' */
+#if defined(CONFIG_STACKPROTECTOR)
+ ld r6, TASK_CANARY(r6)
+ std r6, PACA_CANARY(r13)
+#endif
+ /* Set new PACAKSAVE */
+ clrrdi r7,r8,THREAD_SHIFT /* base of new stack */
+ addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE
+ std r7,PACAKSAVE(r13)
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+BEGIN_MMU_FTR_SECTION
+ bl pin_stack_slb
+END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
+#endif
+ /*
+ * PMU interrupts in radix may come in here. They will use r1, not
+ * PACAKSAVE, so this stack switch will not cause a problem. They
+ * will store to the process stack, which may then be migrated to
+ * another CPU. However the rq lock release on this CPU paired with
+ * the rq lock acquire on the new CPU before the stack becomes
+ * active on the new CPU, will order those stores.
+ */
+ mr r1,r8 /* start using new stack pointer */
+.endm
+
+/*
+ * This routine switches between two different tasks. The process
+ * state of one is saved on its kernel stack. Then the state
+ * of the other is restored from its kernel stack. The memory
+ * management hardware is updated to the second process's state.
+ * Finally, we can return to the second process.
+ * On entry, r3 points to the THREAD for the current task, r4
+ * points to the THREAD for the new task.
+ *
+ * This routine is always called with interrupts disabled.
+ *
+ * Note: there are two ways to get to the "going out" portion
+ * of this code; either by coming in via the entry (_switch)
+ * or via "fork" which must set up an environment equivalent
+ * to the "_switch" path. If you change this , you'll have to
+ * change the fork code also.
+ *
+ * The code which creates the new task context is in 'copy_thread'
+ * in arch/ppc/kernel/process.c
+ *
+ * Note: this uses SWITCH_FRAME_SIZE rather than USER_INT_FRAME_SIZE
+ * because we don't need to leave the redzone ABI gap at the top of
+ * the kernel stack.
+ */
+_GLOBAL(_switch)
+ /*
+ * GCC generated prologue for 32-bit follows stwu r1 ; mflr r0 ; stw r0
+ * whereas 64-bit follows mflr r0 ; std r0 ; stdu r1, so make this
+ * look consistent.
+ *
+ * Other hand-coded asm in the kernel is a mix. Could create a standard
+ * macro to create a stack frame and save LR.
+ */
+#ifdef CONFIG_PPC64
+ mflr r0
+ PPC_STL r0,LRSAVE(r1)
+ PPC_STLU r1,-SWITCH_FRAME_SIZE(r1)
+#else
+ PPC_STLU r1,-SWITCH_FRAME_SIZE(r1)
+ mflr r0
+ PPC_STL r0,SWITCH_FRAME_SIZE+LRSAVE(r1)
+#endif
+ PPC_STL r1,KSP(r3) /* Set old stack pointer */
+ SAVE_NVGPRS(r1) /* volatiles are caller-saved -- Cort */
+ PPC_STL r0,_NIP(r1) /* Return to switch caller */
+ mfcr r0
+ stw r0,_CCR(r1)
+
+ /*
+ * On SMP kernels, care must be taken because a task may be
+ * scheduled off CPUx and on to CPUy. Memory ordering must be
+ * considered.
+ *
+ * Cacheable stores on CPUx will be visible when the task is
+ * scheduled on CPUy by virtue of the core scheduler barriers
+ * (see "Notes on Program-Order guarantees on SMP systems." in
+ * kernel/sched/core.c).
+ *
+ * Uncacheable stores in the case of involuntary preemption must
+ * be taken care of. The smp_mb__after_spinlock() in __schedule()
+ * is implemented as hwsync on powerpc, which orders MMIO too. So
+ * long as there is an hwsync in the context switch path, it will
+ * be executed on the source CPU after the task has performed
+ * all MMIO ops on that CPU, and on the destination CPU before the
+ * task performs any MMIO ops there.
+ */
+
+ /*
+ * The kernel context switch path must contain a spin_lock,
+ * which contains larx/stcx, which will clear any reservation
+ * of the task being switched.
+ */
+
+#ifdef CONFIG_PPC32
+ do_switch_32
+#else
+ do_switch_64
+#endif
+
+ lwz r0,_CCR(r1)
+ mtcrf 0xFF,r0
+ REST_NVGPRS(r1) /* volatiles are destroyed -- Cort */
+ PPC_LL r0,_NIP(r1) /* Return to _switch caller in new task */
+ mtlr r0
+ addi r1,r1,SWITCH_FRAME_SIZE
+ blr
--
2.40.1
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