Commit 1f4c66e8 authored by Michael Ellerman's avatar Michael Ellerman

powerpc/mm: Remove long disabled SLB code

We have a bunch of SLB related code in the tree which is there to handle
dynamic VSIDs - but currently it's all disabled at compile time. The
comments say "Keep that around for when we re-implement dynamic VSIDs".

But that was over 10 years ago (commit 3c726f8d ("[PATCH] ppc64:
support 64k pages")). The chance that it would still work unchanged is
minimal, and in the meantime it's confusing to folks browsing/grepping
the code. If we ever want to re-instate it, it's in the git history.
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Acked-by: default avatarBalbir Singh <bsingharora@gmail.com>
parent f8a25db4
...@@ -209,11 +209,6 @@ data_access_slb_pSeries: ...@@ -209,11 +209,6 @@ data_access_slb_pSeries:
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
std r3,PACA_EXSLB+EX_R3(r13) std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR mfspr r3,SPRN_DAR
#ifdef __DISABLED__
/* Keep that around for when we re-implement dynamic VSIDs */
cmpdi r3,0
bge slb_miss_user_pseries
#endif /* __DISABLED__ */
mfspr r12,SPRN_SRR1 mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE #ifndef CONFIG_RELOCATABLE
b slb_miss_realmode b slb_miss_realmode
...@@ -240,11 +235,6 @@ instruction_access_slb_pSeries: ...@@ -240,11 +235,6 @@ instruction_access_slb_pSeries:
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480)
std r3,PACA_EXSLB+EX_R3(r13) std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
#ifdef __DISABLED__
/* Keep that around for when we re-implement dynamic VSIDs */
cmpdi r3,0
bge slb_miss_user_pseries
#endif /* __DISABLED__ */
mfspr r12,SPRN_SRR1 mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE #ifndef CONFIG_RELOCATABLE
b slb_miss_realmode b slb_miss_realmode
...@@ -709,34 +699,6 @@ system_reset_fwnmi: ...@@ -709,34 +699,6 @@ system_reset_fwnmi:
#endif /* CONFIG_PPC_PSERIES */ #endif /* CONFIG_PPC_PSERIES */
#ifdef __DISABLED__
/*
* This is used for when the SLB miss handler has to go virtual,
* which doesn't happen for now anymore but will once we re-implement
* dynamic VSIDs for shared page tables
*/
slb_miss_user_pseries:
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
GET_SCRATCH0(r10)
ld r11,PACA_EXSLB+EX_R9(r13)
ld r12,PACA_EXSLB+EX_R3(r13)
std r10,PACA_EXGEN+EX_R13(r13)
std r11,PACA_EXGEN+EX_R9(r13)
std r12,PACA_EXGEN+EX_R3(r13)
clrrdi r12,r13,32
mfmsr r10
mfspr r11,SRR0 /* save SRR0 */
ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
ori r10,r10,MSR_IR|MSR_DR|MSR_RI
mtspr SRR0,r12
mfspr r12,SRR1 /* and SRR1 */
mtspr SRR1,r10
rfid
b . /* prevent spec. execution */
#endif /* __DISABLED__ */
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
kvmppc_skip_interrupt: kvmppc_skip_interrupt:
/* /*
...@@ -1012,70 +974,6 @@ instruction_access_common: ...@@ -1012,70 +974,6 @@ instruction_access_common:
STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception) STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
/*
* Here is the common SLB miss user that is used when going to virtual
* mode for SLB misses, that is currently not used
*/
#ifdef __DISABLED__
.align 7
.globl slb_miss_user_common
slb_miss_user_common:
mflr r10
std r3,PACA_EXGEN+EX_DAR(r13)
stw r9,PACA_EXGEN+EX_CCR(r13)
std r10,PACA_EXGEN+EX_LR(r13)
std r11,PACA_EXGEN+EX_SRR0(r13)
bl slb_allocate_user
ld r10,PACA_EXGEN+EX_LR(r13)
ld r3,PACA_EXGEN+EX_R3(r13)
lwz r9,PACA_EXGEN+EX_CCR(r13)
ld r11,PACA_EXGEN+EX_SRR0(r13)
mtlr r10
beq- slb_miss_fault
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
beq- unrecov_user_slb
mfmsr r10
.machine push
.machine "power4"
mtcrf 0x80,r9
.machine pop
clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
mtmsrd r10,1
mtspr SRR0,r11
mtspr SRR1,r12
ld r9,PACA_EXGEN+EX_R9(r13)
ld r10,PACA_EXGEN+EX_R10(r13)
ld r11,PACA_EXGEN+EX_R11(r13)
ld r12,PACA_EXGEN+EX_R12(r13)
ld r13,PACA_EXGEN+EX_R13(r13)
rfid
b .
slb_miss_fault:
EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
ld r4,PACA_EXGEN+EX_DAR(r13)
li r5,0
std r4,_DAR(r1)
std r5,_DSISR(r1)
b handle_page_fault
unrecov_user_slb:
EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
RECONCILE_IRQ_STATE(r10, r11)
bl save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl unrecoverable_exception
b 1b
#endif /* __DISABLED__ */
/* /*
* Machine check is different because we use a different * Machine check is different because we use a different
* save area: PACA_EXMC instead of PACA_EXGEN. * save area: PACA_EXMC instead of PACA_EXGEN.
......
...@@ -32,7 +32,6 @@ enum slb_index { ...@@ -32,7 +32,6 @@ enum slb_index {
}; };
extern void slb_allocate_realmode(unsigned long ea); extern void slb_allocate_realmode(unsigned long ea);
extern void slb_allocate_user(unsigned long ea);
static void slb_allocate(unsigned long ea) static void slb_allocate(unsigned long ea)
{ {
......
...@@ -179,56 +179,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT) ...@@ -179,56 +179,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
li r11,SLB_VSID_USER /* flags don't much matter */ li r11,SLB_VSID_USER /* flags don't much matter */
b slb_finish_load b slb_finish_load
#ifdef __DISABLED__
/* void slb_allocate_user(unsigned long ea);
*
* Create an SLB entry for the given EA (user or kernel).
* r3 = faulting address, r13 = PACA
* r9, r10, r11 are clobbered by this function
* No other registers are examined or changed.
*
* It is called with translation enabled in order to be able to walk the
* page tables. This is not currently used.
*/
_GLOBAL(slb_allocate_user)
/* r3 = faulting address */
srdi r10,r3,28 /* get esid */
crset 4*cr7+lt /* set "user" flag for later */
/* check if we fit in the range covered by the pagetables*/
srdi. r9,r3,PGTABLE_EADDR_SIZE
crnot 4*cr0+eq,4*cr0+eq
beqlr
/* now we need to get to the page tables in order to get the page
* size encoding from the PMD. In the future, we'll be able to deal
* with 1T segments too by getting the encoding from the PGD instead
*/
ld r9,PACAPGDIR(r13)
cmpldi cr0,r9,0
beqlr
rlwinm r11,r10,8,25,28
ldx r9,r9,r11 /* get pgd_t */
cmpldi cr0,r9,0
beqlr
rlwinm r11,r10,3,17,28
ldx r9,r9,r11 /* get pmd_t */
cmpldi cr0,r9,0
beqlr
/* build vsid flags */
andi. r11,r9,SLB_VSID_LLP
ori r11,r11,SLB_VSID_USER
/* get context to calculate proto-VSID */
ld r9,PACACONTEXTID(r13)
/* fall through slb_finish_load */
#endif /* __DISABLED__ */
/* /*
* Finish loading of an SLB entry and return * Finish loading of an SLB entry and return
* *
......
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