Commit 89ff7250 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Michael Ellerman

powerpc/mm: Convert __hash_page_64K to C

Convert from asm to C
Acked-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 227fdbee
......@@ -40,7 +40,8 @@
#define _PAGE_COMBO_VALID (_PAGE_F_GIX | _PAGE_F_SECOND)
/* PTE flags to conserve for HPTE identification */
#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_COMBO)
#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_F_SECOND | \
_PAGE_F_GIX | _PAGE_HASHPTE | _PAGE_COMBO)
/* Shift to put page number into pte.
*
......
......@@ -229,3 +229,133 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
*ptep = __pte(new_pte & ~_PAGE_BUSY);
return 0;
}
int __hash_page_64K(unsigned long ea, unsigned long access,
unsigned long vsid, pte_t *ptep, unsigned long trap,
unsigned long flags, int ssize)
{
unsigned long hpte_group;
unsigned long rflags, pa;
unsigned long old_pte, new_pte;
unsigned long vpn, hash, slot;
unsigned long shift = mmu_psize_defs[MMU_PAGE_64K].shift;
/*
* atomically mark the linux large page PTE busy and dirty
*/
do {
pte_t pte = READ_ONCE(*ptep);
old_pte = pte_val(pte);
/* If PTE busy, retry the access */
if (unlikely(old_pte & _PAGE_BUSY))
return 0;
/* If PTE permissions don't match, take page fault */
if (unlikely(access & ~old_pte))
return 1;
/*
* Check if PTE has the cache-inhibit bit set
* If so, bail out and refault as a 4k page
*/
if (!mmu_has_feature(MMU_FTR_CI_LARGE_PAGE) &&
unlikely(old_pte & _PAGE_NO_CACHE))
return 0;
/*
* Try to lock the PTE, add ACCESSED and DIRTY if it was
* a write access. Since this is 4K insert of 64K page size
* also add _PAGE_COMBO
*/
new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
if (access & _PAGE_RW)
new_pte |= _PAGE_DIRTY;
} while (old_pte != __cmpxchg_u64((unsigned long *)ptep,
old_pte, new_pte));
/*
* PP bits. _PAGE_USER is already PP bit 0x2, so we only
* need to add in 0x1 if it's a read-only user page
*/
rflags = new_pte & _PAGE_USER;
if ((new_pte & _PAGE_USER) && !((new_pte & _PAGE_RW) &&
(new_pte & _PAGE_DIRTY)))
rflags |= 0x1;
/*
* _PAGE_EXEC -> HW_NO_EXEC since it's inverted
*/
rflags |= ((new_pte & _PAGE_EXEC) ? 0 : HPTE_R_N);
/*
* Always add C and Memory coherence bit
*/
rflags |= HPTE_R_C | HPTE_R_M;
/*
* Add in WIMG bits
*/
rflags |= (new_pte & (_PAGE_WRITETHRU | _PAGE_NO_CACHE |
_PAGE_COHERENT | _PAGE_GUARDED));
if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
vpn = hpt_vpn(ea, vsid, ssize);
if (unlikely(old_pte & _PAGE_HASHPTE)) {
/*
* There MIGHT be an HPTE for this pte
*/
hash = hpt_hash(vpn, shift, ssize);
if (old_pte & _PAGE_F_SECOND)
hash = ~hash;
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
slot += (old_pte & _PAGE_F_GIX) >> _PAGE_F_GIX_SHIFT;
if (ppc_md.hpte_updatepp(slot, rflags, vpn, MMU_PAGE_64K,
MMU_PAGE_64K, ssize, flags) == -1)
old_pte &= ~_PAGE_HPTEFLAGS;
}
if (likely(!(old_pte & _PAGE_HASHPTE))) {
pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT;
hash = hpt_hash(vpn, shift, ssize);
repeat:
hpte_group = ((hash & htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;
/* Insert into the hash table, primary slot */
slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, 0,
MMU_PAGE_64K, MMU_PAGE_64K, ssize);
/*
* Primary is full, try the secondary
*/
if (unlikely(slot == -1)) {
hpte_group = ((~hash & htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;
slot = ppc_md.hpte_insert(hpte_group, vpn, pa,
rflags, HPTE_V_SECONDARY,
MMU_PAGE_64K, MMU_PAGE_64K, ssize);
if (slot == -1) {
if (mftb() & 0x1)
hpte_group = ((hash & htab_hash_mask) *
HPTES_PER_GROUP) & ~0x7UL;
ppc_md.hpte_remove(hpte_group);
/*
* FIXME!! Should be try the group from which we removed ?
*/
goto repeat;
}
}
/*
* Hypervisor failure. Restore old pmd and return -1
* similar to __hash_page_*
*/
if (unlikely(slot == -2)) {
*ptep = __pte(old_pte);
hash_failure_debug(ea, access, vsid, trap, ssize,
MMU_PAGE_64K, MMU_PAGE_64K, old_pte);
return -1;
}
new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE;
new_pte |= (slot << _PAGE_F_GIX_SHIFT) & (_PAGE_F_SECOND | _PAGE_F_GIX);
}
*ptep = __pte(new_pte & ~_PAGE_BUSY);
return 0;
}
......@@ -328,292 +328,4 @@ htab_pte_insert_failure:
li r3,-1
b htab_bail
#else /* CONFIG_PPC_64K_PAGES */
/*****************************************************************************
* *
* 64K SW & 64K HW in a 64K segment pages implementation *
* *
*****************************************************************************/
_GLOBAL(__hash_page_64K)
mflr r0
std r0,16(r1)
stdu r1,-STACKFRAMESIZE(r1)
/* Save all params that we need after a function call */
std r6,STK_PARAM(R6)(r1)
std r8,STK_PARAM(R8)(r1)
std r9,STK_PARAM(R9)(r1)
/* Save non-volatile registers.
* r31 will hold "old PTE"
* r30 is "new PTE"
* r29 is vpn
* r28 is a hash value
* r27 is hashtab mask (maybe dynamic patched instead ?)
*/
std r27,STK_REG(R27)(r1)
std r28,STK_REG(R28)(r1)
std r29,STK_REG(R29)(r1)
std r30,STK_REG(R30)(r1)
std r31,STK_REG(R31)(r1)
/* Step 1:
*
* Check permissions, atomically mark the linux PTE busy
* and hashed.
*/
1:
ldarx r31,0,r6
/* Check access rights (access & ~(pte_val(*ptep))) */
andc. r0,r4,r31
bne- ht64_wrong_access
/* Check if PTE is busy */
andi. r0,r31,_PAGE_BUSY
/* If so, just bail out and refault if needed. Someone else
* is changing this PTE anyway and might hash it.
*/
bne- ht64_bail_ok
BEGIN_FTR_SECTION
/* Check if PTE has the cache-inhibit bit set */
andi. r0,r31,_PAGE_NO_CACHE
/* If so, bail out and refault as a 4k page */
bne- ht64_bail_ok
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_CI_LARGE_PAGE)
/* Prepare new PTE value (turn access RW into DIRTY, then
* add BUSY and ACCESSED)
*/
rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
or r30,r30,r31
ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED
/* Write the linux PTE atomically (setting busy) */
stdcx. r30,0,r6
bne- 1b
isync
/* Step 2:
*
* Insert/Update the HPTE in the hash table. At this point,
* r4 (access) is re-useable, we use it for the new HPTE flags
*/
BEGIN_FTR_SECTION
cmpdi r9,0 /* check segment size */
bne 3f
END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
/* Calc vpn and put it in r29 */
sldi r29,r5,SID_SHIFT - VPN_SHIFT
rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT - VPN_SHIFT)
or r29,r28,r29
/* Calculate hash value for primary slot and store it in r28
* r3 = va, r5 = vsid
* r0 = (va >> 16) & ((1ul << (28 - 16)) -1)
*/
rldicl r0,r3,64-16,52
xor r28,r5,r0 /* hash */
b 4f
3: /* Calc vpn and put it in r29 */
sldi r29,r5,SID_SHIFT_1T - VPN_SHIFT
rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT_1T - VPN_SHIFT)
or r29,r28,r29
/*
* calculate hash value for primary slot and
* store it in r28 for 1T segment
* r3 = va, r5 = vsid
*/
sldi r28,r5,25 /* vsid << 25 */
/* r0 = (va >> 16) & ((1ul << (40 - 16)) -1) */
rldicl r0,r3,64-16,40
xor r28,r28,r5 /* vsid ^ ( vsid << 25) */
xor r28,r28,r0 /* hash */
/* Convert linux PTE bits into HW equivalents */
4: andi. r3,r30,0x1fe /* Get basic set of flags */
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
andc r0,r30,r0 /* r0 = pte & ~r0 */
rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */
/*
* Always add "C" bit for perf. Memory coherence is always enabled
*/
ori r3,r3,HPTE_R_C | HPTE_R_M
/* We eventually do the icache sync here (maybe inline that
* code rather than call a C function...)
*/
BEGIN_FTR_SECTION
mr r4,r30
mr r5,r7
bl hash_page_do_lazy_icache
END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
/* At this point, r3 contains new PP bits, save them in
* place of "access" in the param area (sic)
*/
std r3,STK_PARAM(R4)(r1)
/* Get htab_hash_mask */
ld r4,htab_hash_mask@got(2)
ld r27,0(r4) /* htab_hash_mask -> r27 */
/* Check if we may already be in the hashtable, in this case, we
* go to out-of-line code to try to modify the HPTE
*/
rldicl. r0,r31,64-12,48
bne ht64_modify_pte
ht64_insert_pte:
/* Clear hpte bits in new pte (we also clear BUSY btw) and
* add _PAGE_HPTE_SUB0
*/
lis r0,_PAGE_HPTEFLAGS@h
ori r0,r0,_PAGE_HPTEFLAGS@l
andc r30,r30,r0
ori r30,r30,_PAGE_HASHPTE
/* Phyical address in r5 */
rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
sldi r5,r5,PAGE_SHIFT
/* Calculate primary group hash */
and r0,r28,r27
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
/* Call ppc_md.hpte_insert */
ld r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
mr r4,r29 /* Retrieve vpn */
li r7,0 /* !bolted, !secondary */
li r8,MMU_PAGE_64K
li r9,MMU_PAGE_64K /* actual page size */
ld r10,STK_PARAM(R9)(r1) /* segment size */
.globl ht64_call_hpte_insert1
ht64_call_hpte_insert1:
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
bge ht64_pte_insert_ok /* Insertion successful */
cmpdi 0,r3,-2 /* Critical failure */
beq- ht64_pte_insert_failure
/* Now try secondary slot */
/* Phyical address in r5 */
rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
sldi r5,r5,PAGE_SHIFT
/* Calculate secondary group hash */
andc r0,r27,r28
rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */
/* Call ppc_md.hpte_insert */
ld r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
mr r4,r29 /* Retrieve vpn */
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
li r8,MMU_PAGE_64K
li r9,MMU_PAGE_64K /* actual page size */
ld r10,STK_PARAM(R9)(r1) /* segment size */
.globl ht64_call_hpte_insert2
ht64_call_hpte_insert2:
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
bge+ ht64_pte_insert_ok /* Insertion successful */
cmpdi 0,r3,-2 /* Critical failure */
beq- ht64_pte_insert_failure
/* Both are full, we need to evict something */
mftb r0
/* Pick a random group based on TB */
andi. r0,r0,1
mr r5,r28
bne 2f
not r5,r5
2: and r0,r5,r27
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
/* Call ppc_md.hpte_remove */
.globl ht64_call_hpte_remove
ht64_call_hpte_remove:
bl . /* patched by htab_finish_init() */
/* Try all again */
b ht64_insert_pte
ht64_bail_ok:
li r3,0
b ht64_bail
ht64_pte_insert_ok:
/* Insert slot number & secondary bit in PTE */
rldimi r30,r3,12,63-15
/* Write out the PTE with a normal write
* (maybe add eieio may be good still ?)
*/
ht64_write_out_pte:
ld r6,STK_PARAM(R6)(r1)
std r30,0(r6)
li r3, 0
ht64_bail:
ld r27,STK_REG(R27)(r1)
ld r28,STK_REG(R28)(r1)
ld r29,STK_REG(R29)(r1)
ld r30,STK_REG(R30)(r1)
ld r31,STK_REG(R31)(r1)
addi r1,r1,STACKFRAMESIZE
ld r0,16(r1)
mtlr r0
blr
ht64_modify_pte:
/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
mr r4,r3
rlwinm r3,r31,32-12,29,31
/* Secondary group ? if yes, get a inverted hash value */
mr r5,r28
andi. r0,r31,_PAGE_F_SECOND
beq 1f
not r5,r5
1:
/* Calculate proper slot value for ppc_md.hpte_updatepp */
and r0,r5,r27
rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */
add r3,r0,r3 /* add slot idx */
/* Call ppc_md.hpte_updatepp */
mr r5,r29 /* vpn */
li r6,MMU_PAGE_64K /* base page size */
li r7,MMU_PAGE_64K /* actual page size */
ld r8,STK_PARAM(R9)(r1) /* segment size */
ld r9,STK_PARAM(R8)(r1) /* get "flags" param */
.globl ht64_call_hpte_updatepp
ht64_call_hpte_updatepp:
bl . /* patched by htab_finish_init() */
/* if we failed because typically the HPTE wasn't really here
* we try an insertion.
*/
cmpdi 0,r3,-1
beq- ht64_insert_pte
/* Clear the BUSY bit and Write out the PTE */
li r0,_PAGE_BUSY
andc r30,r30,r0
b ht64_write_out_pte
ht64_wrong_access:
/* Bail out clearing reservation */
stdcx. r31,0,r6
li r3,1
b ht64_bail
ht64_pte_insert_failure:
/* Bail out restoring old PTE */
ld r6,STK_PARAM(R6)(r1)
std r31,0(r6)
li r3,-1
b ht64_bail
#endif /* CONFIG_PPC_64K_PAGES */
#endif
......@@ -633,28 +633,11 @@ extern u32 htab_call_hpte_insert1[];
extern u32 htab_call_hpte_insert2[];
extern u32 htab_call_hpte_remove[];
extern u32 htab_call_hpte_updatepp[];
extern u32 ht64_call_hpte_insert1[];
extern u32 ht64_call_hpte_insert2[];
extern u32 ht64_call_hpte_remove[];
extern u32 ht64_call_hpte_updatepp[];
static void __init htab_finish_init(void)
{
#ifdef CONFIG_PPC_64K_PAGES
patch_branch(ht64_call_hpte_insert1,
ppc_function_entry(ppc_md.hpte_insert),
BRANCH_SET_LINK);
patch_branch(ht64_call_hpte_insert2,
ppc_function_entry(ppc_md.hpte_insert),
BRANCH_SET_LINK);
patch_branch(ht64_call_hpte_remove,
ppc_function_entry(ppc_md.hpte_remove),
BRANCH_SET_LINK);
patch_branch(ht64_call_hpte_updatepp,
ppc_function_entry(ppc_md.hpte_updatepp),
BRANCH_SET_LINK);
#else /* !CONFIG_PPC_64K_PAGES */
#ifdef CONFIG_PPC_4K_PAGES
patch_branch(htab_call_hpte_insert1,
ppc_function_entry(ppc_md.hpte_insert),
BRANCH_SET_LINK);
......
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