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aefa5688c0
upatepp can get called for a nohpte fault when we find from the linux
page table that the translation was hashed before. In that case
we are sure that there is no existing translation, hence we could
avoid doing tlbie.
We could possibly race with a parallel fault filling the TLB. But
that should be ok because updatepp is only ever relaxing permissions.
We also look at linux pte permission bits when filling hash pte
permission bits. We also hold the linux pte busy bits while
inserting/updating a hashpte entry, hence a paralle update of
linux pte is not possible. On the other hand mprotect involves
ptep_modify_prot_start which cause a hpte invalidate and not updatepp.
Performance number:
We use randbox_access_bench written by Anton.
Kernel with THP disabled and smaller hash page table size.
86.60% random_access_b [kernel.kallsyms] [k] .native_hpte_updatepp
2.10% random_access_b random_access_bench [.] doit
1.99% random_access_b [kernel.kallsyms] [k] .do_raw_spin_lock
1.85% random_access_b [kernel.kallsyms] [k] .native_hpte_insert
1.26% random_access_b [kernel.kallsyms] [k] .native_flush_hash_range
1.18% random_access_b [kernel.kallsyms] [k] .__delay
0.69% random_access_b [kernel.kallsyms] [k] .native_hpte_remove
0.37% random_access_b [kernel.kallsyms] [k] .clear_user_page
0.34% random_access_b [kernel.kallsyms] [k] .__hash_page_64K
0.32% random_access_b [kernel.kallsyms] [k] fast_exception_return
0.30% random_access_b [kernel.kallsyms] [k] .hash_page_mm
With Fix:
27.54% random_access_b random_access_bench [.] doit
22.90% random_access_b [kernel.kallsyms] [k] .native_hpte_insert
5.76% random_access_b [kernel.kallsyms] [k] .native_hpte_remove
5.20% random_access_b [kernel.kallsyms] [k] fast_exception_return
5.12% random_access_b [kernel.kallsyms] [k] .__hash_page_64K
4.80% random_access_b [kernel.kallsyms] [k] .hash_page_mm
3.31% random_access_b [kernel.kallsyms] [k] data_access_common
1.84% random_access_b [kernel.kallsyms] [k] .trace_hardirqs_on_caller
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
1004 lines
26 KiB
ArmAsm
1004 lines
26 KiB
ArmAsm
/*
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* ppc64 MMU hashtable management routines
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*
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* (c) Copyright IBM Corp. 2003, 2005
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*
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* Maintained by: Benjamin Herrenschmidt
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* <benh@kernel.crashing.org>
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*
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* This file is covered by the GNU Public Licence v2 as
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* described in the kernel's COPYING file.
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*/
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#include <asm/reg.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/types.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cputable.h>
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.text
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/*
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* Stackframe:
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*
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* +-> Back chain (SP + 256)
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* | General register save area (SP + 112)
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* | Parameter save area (SP + 48)
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* | TOC save area (SP + 40)
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* | link editor doubleword (SP + 32)
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* | compiler doubleword (SP + 24)
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* | LR save area (SP + 16)
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* | CR save area (SP + 8)
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* SP ---> +-- Back chain (SP + 0)
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*/
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#ifndef CONFIG_PPC_64K_PAGES
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/*****************************************************************************
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* *
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* 4K SW & 4K HW pages implementation *
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* *
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*****************************************************************************/
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/*
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* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
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* pte_t *ptep, unsigned long trap, unsigned long flags,
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* int ssize)
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*
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* Adds a 4K page to the hash table in a segment of 4K pages only
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*/
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_GLOBAL(__hash_page_4K)
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mflr r0
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std r0,16(r1)
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stdu r1,-STACKFRAMESIZE(r1)
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/* Save all params that we need after a function call */
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std r6,STK_PARAM(R6)(r1)
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std r8,STK_PARAM(R8)(r1)
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std r9,STK_PARAM(R9)(r1)
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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* r29 is vpn
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* r28 is a hash value
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* r27 is hashtab mask (maybe dynamic patched instead ?)
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*/
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std r27,STK_REG(R27)(r1)
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std r28,STK_REG(R28)(r1)
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std r29,STK_REG(R29)(r1)
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std r30,STK_REG(R30)(r1)
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std r31,STK_REG(R31)(r1)
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/* Step 1:
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*
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* Check permissions, atomically mark the linux PTE busy
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* and hashed.
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*/
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1:
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ldarx r31,0,r6
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/* Check access rights (access & ~(pte_val(*ptep))) */
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andc. r0,r4,r31
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bne- htab_wrong_access
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/* Check if PTE is busy */
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andi. r0,r31,_PAGE_BUSY
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/* If so, just bail out and refault if needed. Someone else
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* is changing this PTE anyway and might hash it.
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*/
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bne- htab_bail_ok
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/* Prepare new PTE value (turn access RW into DIRTY, then
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* add BUSY,HASHPTE and ACCESSED)
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*/
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rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
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or r30,r30,r31
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ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED | _PAGE_HASHPTE
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/* Write the linux PTE atomically (setting busy) */
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stdcx. r30,0,r6
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bne- 1b
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isync
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/* Step 2:
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*
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* Insert/Update the HPTE in the hash table. At this point,
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* r4 (access) is re-useable, we use it for the new HPTE flags
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*/
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BEGIN_FTR_SECTION
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cmpdi r9,0 /* check segment size */
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bne 3f
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END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
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/* Calc vpn and put it in r29 */
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sldi r29,r5,SID_SHIFT - VPN_SHIFT
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rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT - VPN_SHIFT)
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or r29,r28,r29
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/*
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* Calculate hash value for primary slot and store it in r28
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* r3 = va, r5 = vsid
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* r0 = (va >> 12) & ((1ul << (28 - 12)) -1)
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*/
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rldicl r0,r3,64-12,48
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xor r28,r5,r0 /* hash */
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b 4f
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3: /* Calc vpn and put it in r29 */
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sldi r29,r5,SID_SHIFT_1T - VPN_SHIFT
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rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT_1T - VPN_SHIFT)
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or r29,r28,r29
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/*
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* calculate hash value for primary slot and
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* store it in r28 for 1T segment
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* r3 = va, r5 = vsid
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*/
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sldi r28,r5,25 /* vsid << 25 */
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/* r0 = (va >> 12) & ((1ul << (40 - 12)) -1) */
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rldicl r0,r3,64-12,36
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xor r28,r28,r5 /* vsid ^ ( vsid << 25) */
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xor r28,r28,r0 /* hash */
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/* Convert linux PTE bits into HW equivalents */
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4: andi. r3,r30,0x1fe /* Get basic set of flags */
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xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
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rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
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rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
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and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
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andc r0,r30,r0 /* r0 = pte & ~r0 */
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rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */
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/*
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* Always add "C" bit for perf. Memory coherence is always enabled
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*/
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ori r3,r3,HPTE_R_C | HPTE_R_M
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/* We eventually do the icache sync here (maybe inline that
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* code rather than call a C function...)
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*/
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BEGIN_FTR_SECTION
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mr r4,r30
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mr r5,r7
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bl hash_page_do_lazy_icache
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END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
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/* At this point, r3 contains new PP bits, save them in
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* place of "access" in the param area (sic)
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*/
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std r3,STK_PARAM(R4)(r1)
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/* Get htab_hash_mask */
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ld r4,htab_hash_mask@got(2)
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ld r27,0(r4) /* htab_hash_mask -> r27 */
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/* Check if we may already be in the hashtable, in this case, we
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* go to out-of-line code to try to modify the HPTE
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*/
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andi. r0,r31,_PAGE_HASHPTE
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bne htab_modify_pte
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htab_insert_pte:
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/* Clear hpte bits in new pte (we also clear BUSY btw) and
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* add _PAGE_HASHPTE
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*/
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lis r0,_PAGE_HPTEFLAGS@h
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ori r0,r0,_PAGE_HPTEFLAGS@l
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andc r30,r30,r0
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ori r30,r30,_PAGE_HASHPTE
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/* physical address r5 */
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rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
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sldi r5,r5,PAGE_SHIFT
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/* Calculate primary group hash */
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and r0,r28,r27
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rldicr r3,r0,3,63-3 /* r3 = (hash & mask) << 3 */
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/* Call ppc_md.hpte_insert */
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ld r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
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mr r4,r29 /* Retrieve vpn */
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li r7,0 /* !bolted, !secondary */
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li r8,MMU_PAGE_4K /* page size */
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li r9,MMU_PAGE_4K /* actual page size */
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ld r10,STK_PARAM(R9)(r1) /* segment size */
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.globl htab_call_hpte_insert1
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htab_call_hpte_insert1:
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bl . /* Patched by htab_finish_init() */
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cmpdi 0,r3,0
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bge htab_pte_insert_ok /* Insertion successful */
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cmpdi 0,r3,-2 /* Critical failure */
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beq- htab_pte_insert_failure
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/* Now try secondary slot */
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/* physical address r5 */
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rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
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sldi r5,r5,PAGE_SHIFT
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/* Calculate secondary group hash */
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andc r0,r27,r28
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rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */
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/* Call ppc_md.hpte_insert */
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ld r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
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mr r4,r29 /* Retrieve vpn */
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li r7,HPTE_V_SECONDARY /* !bolted, secondary */
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li r8,MMU_PAGE_4K /* page size */
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li r9,MMU_PAGE_4K /* actual page size */
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ld r10,STK_PARAM(R9)(r1) /* segment size */
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.globl htab_call_hpte_insert2
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htab_call_hpte_insert2:
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bl . /* Patched by htab_finish_init() */
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cmpdi 0,r3,0
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bge+ htab_pte_insert_ok /* Insertion successful */
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cmpdi 0,r3,-2 /* Critical failure */
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beq- htab_pte_insert_failure
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/* Both are full, we need to evict something */
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mftb r0
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/* Pick a random group based on TB */
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andi. r0,r0,1
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mr r5,r28
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bne 2f
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not r5,r5
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2: and r0,r5,r27
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rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
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/* Call ppc_md.hpte_remove */
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.globl htab_call_hpte_remove
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htab_call_hpte_remove:
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bl . /* Patched by htab_finish_init() */
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/* Try all again */
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b htab_insert_pte
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htab_bail_ok:
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li r3,0
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b htab_bail
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htab_pte_insert_ok:
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/* Insert slot number & secondary bit in PTE */
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rldimi r30,r3,12,63-15
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/* Write out the PTE with a normal write
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* (maybe add eieio may be good still ?)
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*/
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htab_write_out_pte:
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ld r6,STK_PARAM(R6)(r1)
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std r30,0(r6)
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li r3, 0
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htab_bail:
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ld r27,STK_REG(R27)(r1)
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ld r28,STK_REG(R28)(r1)
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ld r29,STK_REG(R29)(r1)
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ld r30,STK_REG(R30)(r1)
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ld r31,STK_REG(R31)(r1)
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addi r1,r1,STACKFRAMESIZE
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ld r0,16(r1)
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mtlr r0
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blr
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htab_modify_pte:
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/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
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mr r4,r3
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rlwinm r3,r31,32-12,29,31
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/* Secondary group ? if yes, get a inverted hash value */
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mr r5,r28
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andi. r0,r31,_PAGE_SECONDARY
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beq 1f
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not r5,r5
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1:
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/* Calculate proper slot value for ppc_md.hpte_updatepp */
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and r0,r5,r27
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rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */
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add r3,r0,r3 /* add slot idx */
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/* Call ppc_md.hpte_updatepp */
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mr r5,r29 /* vpn */
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li r6,MMU_PAGE_4K /* base page size */
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li r7,MMU_PAGE_4K /* actual page size */
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ld r8,STK_PARAM(R9)(r1) /* segment size */
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ld r9,STK_PARAM(R8)(r1) /* get "flags" param */
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.globl htab_call_hpte_updatepp
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htab_call_hpte_updatepp:
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bl . /* Patched by htab_finish_init() */
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/* if we failed because typically the HPTE wasn't really here
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* we try an insertion.
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*/
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cmpdi 0,r3,-1
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beq- htab_insert_pte
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/* Clear the BUSY bit and Write out the PTE */
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li r0,_PAGE_BUSY
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andc r30,r30,r0
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b htab_write_out_pte
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htab_wrong_access:
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/* Bail out clearing reservation */
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stdcx. r31,0,r6
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li r3,1
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b htab_bail
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htab_pte_insert_failure:
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/* Bail out restoring old PTE */
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ld r6,STK_PARAM(R6)(r1)
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std r31,0(r6)
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li r3,-1
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b htab_bail
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#else /* CONFIG_PPC_64K_PAGES */
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/*****************************************************************************
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* *
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* 64K SW & 4K or 64K HW in a 4K segment pages implementation *
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* *
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*****************************************************************************/
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/* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
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* pte_t *ptep, unsigned long trap, unsigned local flags,
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* int ssize, int subpg_prot)
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*/
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/*
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* For now, we do NOT implement Admixed pages
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*/
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_GLOBAL(__hash_page_4K)
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mflr r0
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std r0,16(r1)
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stdu r1,-STACKFRAMESIZE(r1)
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/* Save all params that we need after a function call */
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std r6,STK_PARAM(R6)(r1)
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std r8,STK_PARAM(R8)(r1)
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std r9,STK_PARAM(R9)(r1)
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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* r29 is vpn
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* r28 is a hash value
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* r27 is hashtab mask (maybe dynamic patched instead ?)
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* r26 is the hidx mask
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* r25 is the index in combo page
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*/
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std r25,STK_REG(R25)(r1)
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std r26,STK_REG(R26)(r1)
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std r27,STK_REG(R27)(r1)
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std r28,STK_REG(R28)(r1)
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std r29,STK_REG(R29)(r1)
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std r30,STK_REG(R30)(r1)
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std r31,STK_REG(R31)(r1)
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/* Step 1:
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*
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* Check permissions, atomically mark the linux PTE busy
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* and hashed.
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*/
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1:
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ldarx r31,0,r6
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/* Check access rights (access & ~(pte_val(*ptep))) */
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andc. r0,r4,r31
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bne- htab_wrong_access
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/* Check if PTE is busy */
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andi. r0,r31,_PAGE_BUSY
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/* If so, just bail out and refault if needed. Someone else
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* is changing this PTE anyway and might hash it.
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*/
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bne- htab_bail_ok
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/* Prepare new PTE value (turn access RW into DIRTY, then
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* add BUSY and ACCESSED)
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*/
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rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
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or r30,r30,r31
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ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED
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oris r30,r30,_PAGE_COMBO@h
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/* Write the linux PTE atomically (setting busy) */
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stdcx. r30,0,r6
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bne- 1b
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isync
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/* Step 2:
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*
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* Insert/Update the HPTE in the hash table. At this point,
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* r4 (access) is re-useable, we use it for the new HPTE flags
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*/
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/* Load the hidx index */
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rldicl r25,r3,64-12,60
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BEGIN_FTR_SECTION
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cmpdi r9,0 /* check segment size */
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bne 3f
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END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
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/* Calc vpn and put it in r29 */
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sldi r29,r5,SID_SHIFT - VPN_SHIFT
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/*
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* clrldi r3,r3,64 - SID_SHIFT --> ea & 0xfffffff
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* srdi r28,r3,VPN_SHIFT
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*/
|
|
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 >> 12) & ((1ul << (28 - 12)) -1)
|
|
*/
|
|
rldicl r0,r3,64-12,48
|
|
xor r28,r5,r0 /* hash */
|
|
b 4f
|
|
|
|
3: /* Calc vpn and put it in r29 */
|
|
sldi r29,r5,SID_SHIFT_1T - VPN_SHIFT
|
|
/*
|
|
* clrldi r3,r3,64 - SID_SHIFT_1T --> ea & 0xffffffffff
|
|
* srdi r28,r3,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 >> 12) & ((1ul << (40 - 12)) -1) */
|
|
rldicl r0,r3,64-12,36
|
|
xor r28,r28,r5 /* vsid ^ ( vsid << 25) */
|
|
xor r28,r28,r0 /* hash */
|
|
|
|
/* Convert linux PTE bits into HW equivalents */
|
|
4:
|
|
#ifdef CONFIG_PPC_SUBPAGE_PROT
|
|
andc r10,r30,r10
|
|
andi. r3,r10,0x1fe /* Get basic set of flags */
|
|
rlwinm r0,r10,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
|
|
#else
|
|
andi. r3,r30,0x1fe /* Get basic set of flags */
|
|
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
|
|
#endif
|
|
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
|
|
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,r3,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. We look for
|
|
* the bit at (1 >> (index + 32))
|
|
*/
|
|
rldicl. r0,r31,64-12,48
|
|
li r26,0 /* Default hidx */
|
|
beq htab_insert_pte
|
|
|
|
/*
|
|
* Check if the pte was already inserted into the hash table
|
|
* as a 64k HW page, and invalidate the 64k HPTE if so.
|
|
*/
|
|
andis. r0,r31,_PAGE_COMBO@h
|
|
beq htab_inval_old_hpte
|
|
|
|
ld r6,STK_PARAM(R6)(r1)
|
|
ori r26,r6,PTE_PAGE_HIDX_OFFSET /* Load the hidx mask. */
|
|
ld r26,0(r26)
|
|
addi r5,r25,36 /* Check actual HPTE_SUB bit, this */
|
|
rldcr. r0,r31,r5,0 /* must match pgtable.h definition */
|
|
bne htab_modify_pte
|
|
|
|
htab_insert_pte:
|
|
/* real page number in r5, PTE RPN value + index */
|
|
andis. r0,r31,_PAGE_4K_PFN@h
|
|
srdi r5,r31,PTE_RPN_SHIFT
|
|
bne- htab_special_pfn
|
|
sldi r5,r5,PAGE_FACTOR
|
|
add r5,r5,r25
|
|
htab_special_pfn:
|
|
sldi r5,r5,HW_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_4K /* page size */
|
|
li r9,MMU_PAGE_4K /* actual page size */
|
|
ld r10,STK_PARAM(R9)(r1) /* segment size */
|
|
.globl htab_call_hpte_insert1
|
|
htab_call_hpte_insert1:
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge htab_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- htab_pte_insert_failure
|
|
|
|
/* Now try secondary slot */
|
|
|
|
/* real page number in r5, PTE RPN value + index */
|
|
andis. r0,r31,_PAGE_4K_PFN@h
|
|
srdi r5,r31,PTE_RPN_SHIFT
|
|
bne- 3f
|
|
sldi r5,r5,PAGE_FACTOR
|
|
add r5,r5,r25
|
|
3: sldi r5,r5,HW_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_4K /* page size */
|
|
li r9,MMU_PAGE_4K /* actual page size */
|
|
ld r10,STK_PARAM(R9)(r1) /* segment size */
|
|
.globl htab_call_hpte_insert2
|
|
htab_call_hpte_insert2:
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge+ htab_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- htab_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 htab_call_hpte_remove
|
|
htab_call_hpte_remove:
|
|
bl . /* patched by htab_finish_init() */
|
|
|
|
/* Try all again */
|
|
b htab_insert_pte
|
|
|
|
/*
|
|
* Call out to C code to invalidate an 64k HW HPTE that is
|
|
* useless now that the segment has been switched to 4k pages.
|
|
*/
|
|
htab_inval_old_hpte:
|
|
mr r3,r29 /* vpn */
|
|
mr r4,r31 /* PTE.pte */
|
|
li r5,0 /* PTE.hidx */
|
|
li r6,MMU_PAGE_64K /* psize */
|
|
ld r7,STK_PARAM(R9)(r1) /* ssize */
|
|
ld r8,STK_PARAM(R8)(r1) /* flags */
|
|
bl flush_hash_page
|
|
/* Clear out _PAGE_HPTE_SUB bits in the new linux PTE */
|
|
lis r0,_PAGE_HPTE_SUB@h
|
|
ori r0,r0,_PAGE_HPTE_SUB@l
|
|
andc r30,r30,r0
|
|
b htab_insert_pte
|
|
|
|
htab_bail_ok:
|
|
li r3,0
|
|
b htab_bail
|
|
|
|
htab_pte_insert_ok:
|
|
/* Insert slot number & secondary bit in PTE second half,
|
|
* clear _PAGE_BUSY and set approriate HPTE slot bit
|
|
*/
|
|
ld r6,STK_PARAM(R6)(r1)
|
|
li r0,_PAGE_BUSY
|
|
andc r30,r30,r0
|
|
/* HPTE SUB bit */
|
|
li r0,1
|
|
subfic r5,r25,27 /* Must match bit position in */
|
|
sld r0,r0,r5 /* pgtable.h */
|
|
or r30,r30,r0
|
|
/* hindx */
|
|
sldi r5,r25,2
|
|
sld r3,r3,r5
|
|
li r4,0xf
|
|
sld r4,r4,r5
|
|
andc r26,r26,r4
|
|
or r26,r26,r3
|
|
ori r5,r6,PTE_PAGE_HIDX_OFFSET
|
|
std r26,0(r5)
|
|
lwsync
|
|
std r30,0(r6)
|
|
li r3, 0
|
|
htab_bail:
|
|
ld r25,STK_REG(R25)(r1)
|
|
ld r26,STK_REG(R26)(r1)
|
|
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
|
|
|
|
htab_modify_pte:
|
|
/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
|
|
mr r4,r3
|
|
sldi r5,r25,2
|
|
srd r3,r26,r5
|
|
|
|
/* Secondary group ? if yes, get a inverted hash value */
|
|
mr r5,r28
|
|
andi. r0,r3,0x8 /* page secondary ? */
|
|
beq 1f
|
|
not r5,r5
|
|
1: andi. r3,r3,0x7 /* extract idx alone */
|
|
|
|
/* 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_4K /* base page size */
|
|
li r7,MMU_PAGE_4K /* actual page size */
|
|
ld r8,STK_PARAM(R9)(r1) /* segment size */
|
|
ld r9,STK_PARAM(R8)(r1) /* get "flags" param */
|
|
.globl htab_call_hpte_updatepp
|
|
htab_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- htab_insert_pte
|
|
|
|
/* Clear the BUSY bit and Write out the PTE */
|
|
li r0,_PAGE_BUSY
|
|
andc r30,r30,r0
|
|
ld r6,STK_PARAM(R6)(r1)
|
|
std r30,0(r6)
|
|
li r3,0
|
|
b htab_bail
|
|
|
|
htab_wrong_access:
|
|
/* Bail out clearing reservation */
|
|
stdcx. r31,0,r6
|
|
li r3,1
|
|
b htab_bail
|
|
|
|
htab_pte_insert_failure:
|
|
/* Bail out restoring old PTE */
|
|
ld r6,STK_PARAM(R6)(r1)
|
|
std r31,0(r6)
|
|
li r3,-1
|
|
b htab_bail
|
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
#ifdef CONFIG_PPC_HAS_HASH_64K
|
|
|
|
/*****************************************************************************
|
|
* *
|
|
* 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
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
oris r30,r30,_PAGE_HPTE_SUB0@h
|
|
#else
|
|
ori r30,r30,_PAGE_HASHPTE
|
|
#endif
|
|
/* 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_HAS_HASH_64K */
|
|
|
|
|
|
/*****************************************************************************
|
|
* *
|
|
* Huge pages implementation is in hugetlbpage.c *
|
|
* *
|
|
*****************************************************************************/
|