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| author | John David Anglin <dave.anglin@bell.net> | 2019-04-13 02:12:04 +0300 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2019-05-04 00:47:40 +0300 |
| commit | 6c63ef80014b60ab13bee7e683d0a95521bb7fdd (patch) | |
| tree | 2b9908266692c3aba234f39350df1e3f1650dd1d /arch/parisc | |
| parent | dbdf0760990583649bfaca75fd98f76afd5f3905 (diff) | |
| download | linux-6c63ef80014b60ab13bee7e683d0a95521bb7fdd.tar.xz | |
parisc: Remove lock code to serialize TLB operations in pacache.S
TLB operations only need to be serialized on machines with the Merced
(Stretch) bus. The only machines in this category are L and N class, and
they require a 64-bit PA 2.0 kernel. On these machines, we use local TLB
purges in the tmpalias routines.
We don't need to serialize TLB purges on all other machines. Thus, the
lock/unlock code can be removed when CONFIG_PA20 is not defined.
Further, when CONFIG_PA20 is not defined, alternative patching converts
the TLB purges to local purges when PA 2.0 hardware has been detected.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Tested-By: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/kernel/pacache.S | 43 |
1 files changed, 0 insertions, 43 deletions
diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S index 187f032c9dd8..4e4e8eb25874 100644 --- a/arch/parisc/kernel/pacache.S +++ b/arch/parisc/kernel/pacache.S @@ -311,39 +311,6 @@ fdsync: nop ENDPROC_CFI(flush_data_cache_local) -/* Macros to serialize TLB purge operations on SMP. */ - - .macro tlb_lock la,flags,tmp -#ifdef CONFIG_SMP -98: -#if __PA_LDCW_ALIGNMENT > 4 - load32 pa_tlb_lock + __PA_LDCW_ALIGNMENT-1, \la - depi 0,31,__PA_LDCW_ALIGN_ORDER, \la -#else - load32 pa_tlb_lock, \la -#endif - rsm PSW_SM_I,\flags -1: LDCW 0(\la),\tmp - cmpib,<>,n 0,\tmp,3f -2: ldw 0(\la),\tmp - cmpb,<> %r0,\tmp,1b - nop - b,n 2b -3: -99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP) -#endif - .endm - - .macro tlb_unlock la,flags,tmp -#ifdef CONFIG_SMP -98: ldi 1,\tmp - sync - stw \tmp,0(\la) - mtsm \flags -99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP) -#endif - .endm - /* Clear page using kernel mapping. */ ENTRY_CFI(clear_page_asm) @@ -601,10 +568,8 @@ ENTRY_CFI(copy_user_page_asm) pdtlb,l %r0(%r28) pdtlb,l %r0(%r29) #else - tlb_lock %r20,%r21,%r22 0: pdtlb %r0(%r28) 1: pdtlb %r0(%r29) - tlb_unlock %r20,%r21,%r22 ALTERNATIVE(0b, 0b+4, ALT_COND_NO_SMP, INSN_PxTLB) ALTERNATIVE(1b, 1b+4, ALT_COND_NO_SMP, INSN_PxTLB) #endif @@ -743,9 +708,7 @@ ENTRY_CFI(clear_user_page_asm) #ifdef CONFIG_PA20 pdtlb,l %r0(%r28) #else - tlb_lock %r20,%r21,%r22 0: pdtlb %r0(%r28) - tlb_unlock %r20,%r21,%r22 ALTERNATIVE(0b, 0b+4, ALT_COND_NO_SMP, INSN_PxTLB) #endif @@ -821,9 +784,7 @@ ENTRY_CFI(flush_dcache_page_asm) #ifdef CONFIG_PA20 pdtlb,l %r0(%r28) #else - tlb_lock %r20,%r21,%r22 0: pdtlb %r0(%r28) - tlb_unlock %r20,%r21,%r22 ALTERNATIVE(0b, 0b+4, ALT_COND_NO_SMP, INSN_PxTLB) #endif @@ -882,9 +843,7 @@ ENTRY_CFI(purge_dcache_page_asm) #ifdef CONFIG_PA20 pdtlb,l %r0(%r28) #else - tlb_lock %r20,%r21,%r22 0: pdtlb %r0(%r28) - tlb_unlock %r20,%r21,%r22 ALTERNATIVE(0b, 0b+4, ALT_COND_NO_SMP, INSN_PxTLB) #endif @@ -948,10 +907,8 @@ ENTRY_CFI(flush_icache_page_asm) 1: pitlb,l %r0(%sr4,%r28) ALTERNATIVE(1b, 1b+4, ALT_COND_NO_SPLIT_TLB, INSN_NOP) #else - tlb_lock %r20,%r21,%r22 0: pdtlb %r0(%r28) 1: pitlb %r0(%sr4,%r28) - tlb_unlock %r20,%r21,%r22 ALTERNATIVE(0b, 0b+4, ALT_COND_NO_SMP, INSN_PxTLB) ALTERNATIVE(1b, 1b+4, ALT_COND_NO_SMP, INSN_PxTLB) ALTERNATIVE(1b, 1b+4, ALT_COND_NO_SPLIT_TLB, INSN_NOP) |