[PATCH v2 18/28] sparc32: Drop run-time patching of ASI instructions
From: Sam Ravnborg via B4 Relay
Date: Sat Mar 09 2024 - 13:21:32 EST
From: Sam Ravnborg <sam@xxxxxxxxxxxx>
With only LEON supported there is no need to run-time patch
the instructions to match ASI.
Move a few functions back to C with inline asm, now that
run-time patching is not needed.
Deleted a few functions that turns out not to be used rather
than re-implement them in C.
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
---
arch/sparc/include/asm/asmmacro.h | 22 -----------
arch/sparc/include/asm/pgtsrmmu.h | 28 ++++++-------
arch/sparc/include/asm/sections.h | 3 --
arch/sparc/kernel/entry.S | 7 +---
arch/sparc/kernel/etrap_32.S | 15 +++----
arch/sparc/kernel/rtrap_32.S | 18 +++------
arch/sparc/kernel/vmlinux.lds.S | 5 ---
arch/sparc/kernel/wof.S | 18 +++------
arch/sparc/kernel/wuf.S | 21 ++++------
arch/sparc/mm/Makefile | 1 -
arch/sparc/mm/srmmu_access.S | 83 ---------------------------------------
11 files changed, 40 insertions(+), 181 deletions(-)
diff --git a/arch/sparc/include/asm/asmmacro.h b/arch/sparc/include/asm/asmmacro.h
index 49aaf6f3bc55..d5782dbc7810 100644
--- a/arch/sparc/include/asm/asmmacro.h
+++ b/arch/sparc/include/asm/asmmacro.h
@@ -21,26 +21,4 @@
/* All traps low-level code here must end with this macro. */
#define RESTORE_ALL b ret_trap_entry; clr %l6;
-/* Support for run-time patching of single instructions.
- * This is used to handle the differences in the ASI for
- * MMUREGS for LEON and SUN.
- *
- * Sample:
- * LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0
- * SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0
- * PI == Patch Instruction
- *
- * For LEON we will use the first variant,
- * and for all other we will use the SUN variant.
- * The order is important.
- */
-#define LEON_PI(...) \
-662: __VA_ARGS__
-
-#define SUN_PI_(...) \
- .section .leon_1insn_patch, "ax"; \
- .word 662b; \
- __VA_ARGS__; \
- .previous
-
#endif /* !(_SPARC_ASMMACRO_H) */
diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h
index 7cb5cbc83211..69c28ff3c4c4 100644
--- a/arch/sparc/include/asm/pgtsrmmu.h
+++ b/arch/sparc/include/asm/pgtsrmmu.h
@@ -107,22 +107,22 @@ extern void *srmmu_nocache_pool;
#define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
#define __nocache_fix(VADDR) ((__typeof__(VADDR))__va(__nocache_pa(VADDR)))
-/* Accessing the MMU control register. */
-unsigned int srmmu_get_mmureg(void);
-void srmmu_set_mmureg(unsigned long regval);
-void srmmu_set_ctable_ptr(unsigned long paddr);
-void srmmu_set_context(int context);
-int srmmu_get_context(void);
-unsigned int srmmu_get_fstatus(void);
-unsigned int srmmu_get_faddr(void);
-
-/* This is guaranteed on all SRMMU's. */
-static inline void srmmu_flush_whole_tlb(void)
+static inline void srmmu_set_ctable_ptr(unsigned long paddr)
{
- __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
- "r" (0x400), /* Flush entire TLB!! */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
+ paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
+ asm volatile("sta %0, [%1] %2\n\t" : : "r" (paddr), "r" (SRMMU_CTXTBL_PTR), "i" (ASI_LEON_MMUREGS) : "memory");
+}
+static inline void srmmu_set_context(int context)
+{
+ asm volatile("sta %0, [%1] %2\n\t" : : "r" (context), "r" (SRMMU_CTX_REG), "i" (ASI_LEON_MMUREGS) : "memory");
+}
+
+static inline int srmmu_get_context(void)
+{
+ register int retval;
+ asm volatile("lda [%1] %2, %0\n\t" : "=r" (retval) : "r" (SRMMU_CTX_REG), "i" (ASI_LEON_MMUREGS));
+ return retval;
}
#endif /* !(__ASSEMBLY__) */
diff --git a/arch/sparc/include/asm/sections.h b/arch/sparc/include/asm/sections.h
index 08f833453ab3..e9d28148850b 100644
--- a/arch/sparc/include/asm/sections.h
+++ b/arch/sparc/include/asm/sections.h
@@ -8,7 +8,4 @@
/* sparc entry point */
extern char _start[];
-extern char __leon_1insn_patch[];
-extern char __leon_1insn_patch_end[];
-
#endif
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index f158cbca3e62..18c67b4fb017 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -469,11 +469,8 @@ srmmu_fault:
mov 0x400, %l5
mov 0x300, %l4
-LEON_PI(lda [%l5] ASI_LEON_MMUREGS, %l6) ! read sfar first
-SUN_PI_(lda [%l5] ASI_M_MMUREGS, %l6) ! read sfar first
-
-LEON_PI(lda [%l4] ASI_LEON_MMUREGS, %l5) ! read sfsr last
-SUN_PI_(lda [%l4] ASI_M_MMUREGS, %l5) ! read sfsr last
+ lda [%l5] ASI_LEON_MMUREGS, %l6 ! read sfar first
+ lda [%l4] ASI_LEON_MMUREGS, %l5 ! read sfsr last
andn %l6, 0xfff, %l6
srl %l5, 6, %l5 ! and encode all info into l7
diff --git a/arch/sparc/kernel/etrap_32.S b/arch/sparc/kernel/etrap_32.S
index 9f243f918619..bb222459f097 100644
--- a/arch/sparc/kernel/etrap_32.S
+++ b/arch/sparc/kernel/etrap_32.S
@@ -235,8 +235,7 @@ tsetup_srmmu_stackchk:
cmp %glob_tmp, %sp
bleu,a 1f
-LEON_PI( lda [%g0] ASI_LEON_MMUREGS, %glob_tmp) ! read MMU control
-SUN_PI_( lda [%g0] ASI_M_MMUREGS, %glob_tmp) ! read MMU control
+ lda [%g0] ASI_LEON_MMUREGS, %glob_tmp ! read MMU control
trap_setup_user_stack_is_bolixed:
/* From user/kernel into invalid window w/bad user
@@ -251,24 +250,20 @@ trap_setup_user_stack_is_bolixed:
1:
/* Clear the fault status and turn on the no_fault bit. */
or %glob_tmp, 0x2, %glob_tmp ! or in no_fault bit
-LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS) ! set it
-SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS) ! set it
+ sta %glob_tmp, [%g0] ASI_LEON_MMUREGS ! set it
/* Dump the registers and cross fingers. */
STORE_WINDOW(sp)
/* Clear the no_fault bit and check the status. */
andn %glob_tmp, 0x2, %glob_tmp
-LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS)
-SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS)
+ sta %glob_tmp, [%g0] ASI_LEON_MMUREGS
mov AC_M_SFAR, %glob_tmp
-LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %g0)
-SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %g0)
+ lda [%glob_tmp] ASI_LEON_MMUREGS, %g0
mov AC_M_SFSR, %glob_tmp
-LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp)! save away status of winstore
-SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %glob_tmp) ! save away status of winstore
+ lda [%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp ! save away status of winstore
andcc %glob_tmp, 0x2, %g0 ! did we fault?
bne trap_setup_user_stack_is_bolixed ! failure
diff --git a/arch/sparc/kernel/rtrap_32.S b/arch/sparc/kernel/rtrap_32.S
index 8931fe266346..a232b367c219 100644
--- a/arch/sparc/kernel/rtrap_32.S
+++ b/arch/sparc/kernel/rtrap_32.S
@@ -232,14 +232,11 @@ srmmu_rett_stackchk:
cmp %g1, %fp
bleu ret_trap_user_stack_is_bolixed
mov AC_M_SFSR, %g1
-LEON_PI(lda [%g1] ASI_LEON_MMUREGS, %g0)
-SUN_PI_(lda [%g1] ASI_M_MMUREGS, %g0)
+ lda [%g1] ASI_LEON_MMUREGS, %g0
-LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %g1)
-SUN_PI_(lda [%g0] ASI_M_MMUREGS, %g1)
+ lda [%g0] ASI_LEON_MMUREGS, %g1
or %g1, 0x2, %g1
-LEON_PI(sta %g1, [%g0] ASI_LEON_MMUREGS)
-SUN_PI_(sta %g1, [%g0] ASI_M_MMUREGS)
+ sta %g1, [%g0] ASI_LEON_MMUREGS
restore %g0, %g0, %g0
@@ -248,16 +245,13 @@ SUN_PI_(sta %g1, [%g0] ASI_M_MMUREGS)
save %g0, %g0, %g0
andn %g1, 0x2, %g1
-LEON_PI(sta %g1, [%g0] ASI_LEON_MMUREGS)
-SUN_PI_(sta %g1, [%g0] ASI_M_MMUREGS)
+ sta %g1, [%g0] ASI_LEON_MMUREGS
mov AC_M_SFAR, %g2
-LEON_PI(lda [%g2] ASI_LEON_MMUREGS, %g2)
-SUN_PI_(lda [%g2] ASI_M_MMUREGS, %g2)
+ lda [%g2] ASI_LEON_MMUREGS, %g2
mov AC_M_SFSR, %g1
-LEON_PI(lda [%g1] ASI_LEON_MMUREGS, %g1)
-SUN_PI_(lda [%g1] ASI_M_MMUREGS, %g1)
+ lda [%g1] ASI_LEON_MMUREGS, %g1
andcc %g1, 0x2, %g0
be ret_trap_userwins_ok
nop
diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
index d317a843f7ea..1cc4d3e79321 100644
--- a/arch/sparc/kernel/vmlinux.lds.S
+++ b/arch/sparc/kernel/vmlinux.lds.S
@@ -113,11 +113,6 @@ SECTIONS
*(.sun4v_2insn_patch)
__sun4v_2insn_patch_end = .;
}
- .leon_1insn_patch : {
- __leon_1insn_patch = .;
- *(.leon_1insn_patch)
- __leon_1insn_patch_end = .;
- }
.swapper_tsb_phys_patch : {
__swapper_tsb_phys_patch = .;
*(.swapper_tsb_phys_patch)
diff --git a/arch/sparc/kernel/wof.S b/arch/sparc/kernel/wof.S
index 96a3a112423a..fe4cfd4abcd2 100644
--- a/arch/sparc/kernel/wof.S
+++ b/arch/sparc/kernel/wof.S
@@ -333,30 +333,24 @@ spwin_srmmu_stackchk:
mov AC_M_SFSR, %glob_tmp
/* Clear the fault status and turn on the no_fault bit. */
-LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %g0) ! eat SFSR
-SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %g0) ! eat SFSR
+ lda [%glob_tmp] ASI_LEON_MMUREGS, %g0 ! eat SFSR
-LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %glob_tmp) ! read MMU control
-SUN_PI_(lda [%g0] ASI_M_MMUREGS, %glob_tmp) ! read MMU control
+ lda [%g0] ASI_LEON_MMUREGS, %glob_tmp ! read MMU control
or %glob_tmp, 0x2, %glob_tmp ! or in no_fault bit
-LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS) ! set it
-SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS) ! set it
+ sta %glob_tmp, [%g0] ASI_LEON_MMUREGS ! set it
/* Dump the registers and cross fingers. */
STORE_WINDOW(sp)
/* Clear the no_fault bit and check the status. */
andn %glob_tmp, 0x2, %glob_tmp
-LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS)
-SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS)
+ sta %glob_tmp, [%g0] ASI_LEON_MMUREGS
mov AC_M_SFAR, %glob_tmp
-LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %g0)
-SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %g0)
+ lda [%glob_tmp] ASI_LEON_MMUREGS, %g0
mov AC_M_SFSR, %glob_tmp
-LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp)
-SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %glob_tmp)
+ lda [%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp
andcc %glob_tmp, 0x2, %g0 ! did we fault?
be,a spwin_finish_up + 0x4 ! cool beans, success
restore %g0, %g0, %g0
diff --git a/arch/sparc/kernel/wuf.S b/arch/sparc/kernel/wuf.S
index 1a4ca490e9c2..4c52b69d4b7a 100644
--- a/arch/sparc/kernel/wuf.S
+++ b/arch/sparc/kernel/wuf.S
@@ -255,19 +255,16 @@ srmmu_fwin_stackchk:
mov AC_M_SFSR, %l4
cmp %l5, %sp
bleu fwin_user_stack_is_bolixed
-LEON_PI( lda [%l4] ASI_LEON_MMUREGS, %g0) ! clear fault status
-SUN_PI_( lda [%l4] ASI_M_MMUREGS, %g0) ! clear fault status
+ lda [%l4] ASI_LEON_MMUREGS, %g0 ! clear fault status
/* The technique is, turn off faults on this processor,
* just let the load rip, then check the sfsr to see if
* a fault did occur. Then we turn on fault traps again
* and branch conditionally based upon what happened.
*/
-LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %l5) ! read mmu-ctrl reg
-SUN_PI_(lda [%g0] ASI_M_MMUREGS, %l5) ! read mmu-ctrl reg
+ lda [%g0] ASI_LEON_MMUREGS, %l5 ! read mmu-ctrl reg
or %l5, 0x2, %l5 ! turn on no-fault bit
-LEON_PI(sta %l5, [%g0] ASI_LEON_MMUREGS) ! store it
-SUN_PI_(sta %l5, [%g0] ASI_M_MMUREGS) ! store it
+ sta %l5, [%g0] ASI_LEON_MMUREGS ! store it
/* Cross fingers and go for it. */
LOAD_WINDOW(sp)
@@ -279,19 +276,15 @@ SUN_PI_(sta %l5, [%g0] ASI_M_MMUREGS) ! store it
/* LOCATION: Window 'T' */
-LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %twin_tmp1) ! load mmu-ctrl again
-SUN_PI_(lda [%g0] ASI_M_MMUREGS, %twin_tmp1) ! load mmu-ctrl again
+ lda [%g0] ASI_LEON_MMUREGS, %twin_tmp1 ! load mmu-ctrl again
andn %twin_tmp1, 0x2, %twin_tmp1 ! clear no-fault bit
-LEON_PI(sta %twin_tmp1, [%g0] ASI_LEON_MMUREGS) ! store it
-SUN_PI_(sta %twin_tmp1, [%g0] ASI_M_MMUREGS) ! store it
+ sta %twin_tmp1, [%g0] ASI_LEON_MMUREGS ! store it
mov AC_M_SFAR, %twin_tmp2
-LEON_PI(lda [%twin_tmp2] ASI_LEON_MMUREGS, %g0) ! read fault address
-SUN_PI_(lda [%twin_tmp2] ASI_M_MMUREGS, %g0) ! read fault address
+ lda [%twin_tmp2] ASI_LEON_MMUREGS, %g0 ! read fault address
mov AC_M_SFSR, %twin_tmp2
-LEON_PI(lda [%twin_tmp2] ASI_LEON_MMUREGS, %twin_tmp2) ! read fault status
-SUN_PI_(lda [%twin_tmp2] ASI_M_MMUREGS, %twin_tmp2) ! read fault status
+ lda [%twin_tmp2] ASI_LEON_MMUREGS, %twin_tmp2 ! read fault status
andcc %twin_tmp2, 0x2, %g0 ! did fault occur?
bne 1f ! yep, cleanup
diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
index 7b3ff6dd382e..f0560eea2958 100644
--- a/arch/sparc/mm/Makefile
+++ b/arch/sparc/mm/Makefile
@@ -8,7 +8,6 @@ obj-$(CONFIG_SPARC64) += ultra.o tlb.o tsb.o
obj-y += fault_$(BITS).o
obj-y += init_$(BITS).o
obj-$(CONFIG_SPARC32) += srmmu.o iommu.o io-unit.o
-obj-$(CONFIG_SPARC32) += srmmu_access.o
obj-$(CONFIG_SPARC32) += leon_mm.o
# Only used by sparc64
diff --git a/arch/sparc/mm/srmmu_access.S b/arch/sparc/mm/srmmu_access.S
deleted file mode 100644
index d8d2e644a5ca..000000000000
--- a/arch/sparc/mm/srmmu_access.S
+++ /dev/null
@@ -1,83 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Assembler variants of srmmu access functions.
- * Implemented in assembler to allow run-time patching.
- * LEON uses a different ASI for MMUREGS than SUN.
- *
- * The leon_1insn_patch infrastructure is used
- * for the run-time patching.
- */
-
-#include <linux/linkage.h>
-
-#include <asm/asmmacro.h>
-#include <asm/pgtsrmmu.h>
-#include <asm/asi.h>
-
-/* unsigned int srmmu_get_mmureg(void) */
-ENTRY(srmmu_get_mmureg)
-LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0)
-SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0)
- retl
- nop
-ENDPROC(srmmu_get_mmureg)
-
-/* void srmmu_set_mmureg(unsigned long regval) */
-ENTRY(srmmu_set_mmureg)
-LEON_PI(sta %o0, [%g0] ASI_LEON_MMUREGS)
-SUN_PI_(sta %o0, [%g0] ASI_M_MMUREGS)
- retl
- nop
-ENDPROC(srmmu_set_mmureg)
-
-/* void srmmu_set_ctable_ptr(unsigned long paddr) */
-ENTRY(srmmu_set_ctable_ptr)
- /* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */
- srl %o0, 4, %g1
- and %g1, SRMMU_CTX_PMASK, %g1
-
- mov SRMMU_CTXTBL_PTR, %g2
-LEON_PI(sta %g1, [%g2] ASI_LEON_MMUREGS)
-SUN_PI_(sta %g1, [%g2] ASI_M_MMUREGS)
- retl
- nop
-ENDPROC(srmmu_set_ctable_ptr)
-
-
-/* void srmmu_set_context(int context) */
-ENTRY(srmmu_set_context)
- mov SRMMU_CTX_REG, %g1
-LEON_PI(sta %o0, [%g1] ASI_LEON_MMUREGS)
-SUN_PI_(sta %o0, [%g1] ASI_M_MMUREGS)
- retl
- nop
-ENDPROC(srmmu_set_context)
-
-
-/* int srmmu_get_context(void) */
-ENTRY(srmmu_get_context)
- mov SRMMU_CTX_REG, %o0
-LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
-SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
- retl
- nop
-ENDPROC(srmmu_get_context)
-
-
-/* unsigned int srmmu_get_fstatus(void) */
-ENTRY(srmmu_get_fstatus)
- mov SRMMU_FAULT_STATUS, %o0
-LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
-SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
- retl
- nop
-ENDPROC(srmmu_get_fstatus)
-
-
-/* unsigned int srmmu_get_faddr(void) */
-ENTRY(srmmu_get_faddr)
- mov SRMMU_FAULT_ADDR, %o0
-LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
-SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
- retl
- nop
-ENDPROC(srmmu_get_faddr)
--
2.34.1