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POWERPC: Allow 32-bit hashed pgtable code to support 36-bit physical

Browse source 
This rearranges a bit of code, and adds support for
36-bit physical addressing for configs that use a
hashed page table.  The 36b physical support is not
enabled by default on any config - it must be
explicitly enabled via the config system.

This patch *only* expands the page table code to accomodate
large physical addresses on 32-bit systems and enables the
PHYS_64BIT config option for 86xx.  It does *not*
allow you to boot a board with more than about 3.5GB of
RAM - for that, SWIOTLB support is also required (and
coming soon).

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2008-09-24 11:01:24 -05:00 • committed by Kumar Gala
parent 9a62c05180
commit 4ee7084eb1
10 changed files with 109 additions and 33 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/include/asm/io.h
View file

@ -711,7 +711,7 @@ static inline void * phys_to_virt(unsigned long address)
/*
* Change "struct page" to physical address.
*/
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
#define page_to_phys(page) ((phys_addr_t)page_to_pfn(page) << PAGE_SHIFT)
/* We do NOT want virtual merging, it would put too much pressure on
* our iommu allocator. Instead, we want drivers to be smart enough

8
arch/powerpc/include/asm/page_32.h
View file

@ -13,10 +13,16 @@
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#endif
#ifdef CONFIG_PTE_64BIT
#define PTE_FLAGS_OFFSET 4 /* offset of PTE flags, in bytes */
#else
#define PTE_FLAGS_OFFSET 0
#endif
#ifndef __ASSEMBLY__
/*
* The basic type of a PTE - 64 bits for those CPUs with > 32 bit
* physical addressing. For now this just the IBM PPC440.
* physical addressing.
*/
#ifdef CONFIG_PTE_64BIT
typedef unsigned long long pte_basic_t;

17
arch/powerpc/include/asm/pgtable-ppc32.h
View file

@ -369,7 +369,12 @@ extern int icache_44x_need_flush;
#define _PAGE_RW 0x400 /* software: user write access allowed */
#define _PAGE_SPECIAL 0x800 /* software: Special page */
#ifdef CONFIG_PTE_64BIT
/* We never clear the high word of the pte */
#define _PTE_NONE_MASK (0xffffffff00000000ULL | _PAGE_HASHPTE)
#else
#define _PTE_NONE_MASK _PAGE_HASHPTE
#endif
#define _PMD_PRESENT 0
#define _PMD_PRESENT_MASK (PAGE_MASK)
@ -587,6 +592,10 @@ extern int flush_hash_pages(unsigned context, unsigned long va,
extern void add_hash_page(unsigned context, unsigned long va,
unsigned long pmdval);
/* Flush an entry from the TLB/hash table */
extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
unsigned long address);
/*
* Atomic PTE updates.
*
@ -665,9 +674,13 @@ static inline unsigned long long pte_update(pte_t *p,
static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
#if _PAGE_HASHPTE != 0
#if (_PAGE_HASHPTE != 0) && defined(CONFIG_SMP) && !defined(CONFIG_PTE_64BIT)
pte_update(ptep, ~_PAGE_HASHPTE, pte_val(pte) & ~_PAGE_HASHPTE);
#elif defined(CONFIG_PTE_64BIT) && defined(CONFIG_SMP)
#if _PAGE_HASHPTE != 0
if (pte_val(*ptep) & _PAGE_HASHPTE)
flush_hash_entry(mm, ptep, addr);
#endif
__asm__ __volatile__("\
stw%U0%X0 %2,%0\n\
eieio\n\
@ -675,7 +688,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
: "=m" (*ptep), "=m" (*((unsigned char *)ptep+4))
: "r" (pte) : "memory");
#else
*ptep = pte;
*ptep = (*ptep & _PAGE_HASHPTE) | (pte & ~_PAGE_HASHPTE);
#endif
}

1
arch/powerpc/kernel/asm-offsets.c
View file

@ -352,6 +352,7 @@ int main(void)
#endif
DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE);
DEFINE(PTE_SIZE, sizeof(pte_t));
#ifdef CONFIG_KVM
DEFINE(TLBE_BYTES, sizeof(struct tlbe));

4
arch/powerpc/kernel/head_32.S
View file

@ -369,13 +369,13 @@ i##n: \
DataAccess:
EXCEPTION_PROLOG
mfspr r10,SPRN_DSISR
stw r10,_DSISR(r11)
andis. r0,r10,0xa470 /* weird error? */
bne 1f /* if not, try to put a PTE */
mfspr r4,SPRN_DAR /* into the hash table */
rlwinm r3,r10,32-15,21,21 /* DSISR_STORE -> _PAGE_RW */
bl hash_page
1: stw r10,_DSISR(r11)
mr r5,r10
1: lwz r5,_DSISR(r11) /* get DSISR value */
mfspr r4,SPRN_DAR
EXC_XFER_EE_LITE(0x300, handle_page_fault)

2
arch/powerpc/kernel/head_fsl_booke.S
View file

@ -422,7 +422,6 @@ skpinv: addi r6,r6,1 /* Increment */
* r12 is pointer to the pte
*/
#ifdef CONFIG_PTE_64BIT
#define PTE_FLAGS_OFFSET 4
#define FIND_PTE \
rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
@ -431,7 +430,6 @@ skpinv: addi r6,r6,1 /* Increment */
rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
lwz r11, 4(r12); /* Get pte entry */
#else
#define PTE_FLAGS_OFFSET 0
#define FIND_PTE \
rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
lwz r11, 0(r11); /* Get L1 entry */ \

86
arch/powerpc/mm/hash_low_32.S
View file

@ -75,7 +75,7 @@ _GLOBAL(hash_page_sync)
* Returns to the caller if the access is illegal or there is no
* mapping for the address. Otherwise it places an appropriate PTE
* in the hash table and returns from the exception.
* Uses r0, r3 - r8, ctr, lr.
* Uses r0, r3 - r8, r10, ctr, lr.
*/
.text
_GLOBAL(hash_page)
@ -106,9 +106,15 @@ _GLOBAL(hash_page)
addi r5,r5,swapper_pg_dir@l /* kernel page table */
rlwimi r3,r9,32-12,29,29 /* MSR_PR -> _PAGE_USER */
112: add r5,r5,r7 /* convert to phys addr */
#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,12,20,29 /* insert top 10 bits of address */
lwz r8,0(r5) /* get pmd entry */
rlwinm. r8,r8,0,0,19 /* extract address of pte page */
#else
rlwinm r8,r4,13,19,29 /* Compute pgdir/pmd offset */
lwzx r8,r8,r5 /* Get L1 entry */
rlwinm. r8,r8,0,0,20 /* extract pt base address */
#endif
#ifdef CONFIG_SMP
beq- hash_page_out /* return if no mapping */
#else
@ -118,7 +124,11 @@ _GLOBAL(hash_page)
to the address following the rfi. */
beqlr-
#endif
#ifndef CONFIG_PTE_64BIT
rlwimi r8,r4,22,20,29 /* insert next 10 bits of address */
#else
rlwimi r8,r4,23,20,28 /* compute pte address */
#endif
rlwinm r0,r3,32-3,24,24 /* _PAGE_RW access -> _PAGE_DIRTY */
ori r0,r0,_PAGE_ACCESSED|_PAGE_HASHPTE
@ -127,9 +137,15 @@ _GLOBAL(hash_page)
* because almost always, there won't be a permission violation
* and there won't already be an HPTE, and thus we will have
* to update the PTE to set _PAGE_HASHPTE. -- paulus.
*
* If PTE_64BIT is set, the low word is the flags word; use that
* word for locking since it contains all the interesting bits.
*/
#if (PTE_FLAGS_OFFSET != 0)
addi r8,r8,PTE_FLAGS_OFFSET
#endif
retry:
lwarx r6,0,r8 /* get linux-style pte */
lwarx r6,0,r8 /* get linux-style pte, flag word */
andc. r5,r3,r6 /* check access & ~permission */
#ifdef CONFIG_SMP
bne- hash_page_out /* return if access not permitted */
@ -137,6 +153,15 @@ retry:
bnelr-
#endif
or r5,r0,r6 /* set accessed/dirty bits */
#ifdef CONFIG_PTE_64BIT
#ifdef CONFIG_SMP
subf r10,r6,r8 /* create false data dependency */
subi r10,r10,PTE_FLAGS_OFFSET
lwzx r10,r6,r10 /* Get upper PTE word */
#else
lwz r10,-PTE_FLAGS_OFFSET(r8)
#endif /* CONFIG_SMP */
#endif /* CONFIG_PTE_64BIT */
stwcx. r5,0,r8 /* attempt to update PTE */
bne- retry /* retry if someone got there first */
@ -203,9 +228,9 @@ _GLOBAL(add_hash_page)
* we can't take a hash table miss (assuming the code is
* covered by a BAT). -- paulus
*/
mfmsr r10
mfmsr r9
SYNC
rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */
rlwinm r0,r9,0,17,15 /* clear bit 16 (MSR_EE) */
rlwinm r0,r0,0,28,26 /* clear MSR_DR */
mtmsr r0
SYNC_601
@ -214,14 +239,14 @@ _GLOBAL(add_hash_page)
tophys(r7,0)
#ifdef CONFIG_SMP
addis r9,r7,mmu_hash_lock@ha
addi r9,r9,mmu_hash_lock@l
10: lwarx r0,0,r9 /* take the mmu_hash_lock */
addis r6,r7,mmu_hash_lock@ha
addi r6,r6,mmu_hash_lock@l
10: lwarx r0,0,r6 /* take the mmu_hash_lock */
cmpi 0,r0,0
bne- 11f
stwcx. r8,0,r9
stwcx. r8,0,r6
beq+ 12f
11: lwz r0,0(r9)
11: lwz r0,0(r6)
cmpi 0,r0,0
beq 10b
b 11b
@ -234,10 +259,24 @@ _GLOBAL(add_hash_page)
* HPTE, so we just unlock and return.
*/
mr r8,r5
#ifndef CONFIG_PTE_64BIT
rlwimi r8,r4,22,20,29
#else
rlwimi r8,r4,23,20,28
addi r8,r8,PTE_FLAGS_OFFSET
#endif
1: lwarx r6,0,r8
andi. r0,r6,_PAGE_HASHPTE
bne 9f /* if HASHPTE already set, done */
#ifdef CONFIG_PTE_64BIT
#ifdef CONFIG_SMP
subf r10,r6,r8 /* create false data dependency */
subi r10,r10,PTE_FLAGS_OFFSET
lwzx r10,r6,r10 /* Get upper PTE word */
#else
lwz r10,-PTE_FLAGS_OFFSET(r8)
#endif /* CONFIG_SMP */
#endif /* CONFIG_PTE_64BIT */
ori r5,r6,_PAGE_HASHPTE
stwcx. r5,0,r8
bne- 1b
@ -246,13 +285,15 @@ _GLOBAL(add_hash_page)
9:
#ifdef CONFIG_SMP
addis r6,r7,mmu_hash_lock@ha
addi r6,r6,mmu_hash_lock@l
eieio
li r0,0
stw r0,0(r9) /* clear mmu_hash_lock */
stw r0,0(r6) /* clear mmu_hash_lock */
#endif
/* reenable interrupts and DR */
mtmsr r10
mtmsr r9
SYNC_601
isync
@ -267,7 +308,8 @@ _GLOBAL(add_hash_page)
* r5 contains the linux PTE, r6 contains the old value of the
* linux PTE (before setting _PAGE_HASHPTE) and r7 contains the
* offset to be added to addresses (0 if the MMU is on,
* -KERNELBASE if it is off).
* -KERNELBASE if it is off). r10 contains the upper half of
* the PTE if CONFIG_PTE_64BIT.
* On SMP, the caller should have the mmu_hash_lock held.
* We assume that the caller has (or will) set the _PAGE_HASHPTE
* bit in the linux PTE in memory. The value passed in r6 should
@ -313,6 +355,11 @@ _GLOBAL(create_hpte)
BEGIN_FTR_SECTION
ori r8,r8,_PAGE_COHERENT /* set M (coherence required) */
END_FTR_SECTION_IFSET(CPU_FTR_NEED_COHERENT)
#ifdef CONFIG_PTE_64BIT
/* Put the XPN bits into the PTE */
rlwimi r8,r10,8,20,22
rlwimi r8,r10,2,29,29
#endif
/* Construct the high word of the PPC-style PTE (r5) */
rlwinm r5,r3,7,1,24 /* put VSID in 0x7fffff80 bits */
@ -499,14 +546,18 @@ _GLOBAL(flush_hash_pages)
isync
/* First find a PTE in the range that has _PAGE_HASHPTE set */
#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,22,20,29
1: lwz r0,0(r5)
#else
rlwimi r5,r4,23,20,28
#endif
1: lwz r0,PTE_FLAGS_OFFSET(r5)
cmpwi cr1,r6,1
andi. r0,r0,_PAGE_HASHPTE
bne 2f
ble cr1,19f
addi r4,r4,0x1000
addi r5,r5,4
addi r5,r5,PTE_SIZE
addi r6,r6,-1
b 1b
@ -545,7 +596,10 @@ _GLOBAL(flush_hash_pages)
* already clear, we're done (for this pte). If not,
* clear it (atomically) and proceed. -- paulus.
*/
33: lwarx r8,0,r5 /* fetch the pte */
#if (PTE_FLAGS_OFFSET != 0)
addi r5,r5,PTE_FLAGS_OFFSET
#endif
33: lwarx r8,0,r5 /* fetch the pte flags word */
andi. r0,r8,_PAGE_HASHPTE
beq 8f /* done if HASHPTE is already clear */
rlwinm r8,r8,0,31,29 /* clear HASHPTE bit */
@ -590,7 +644,7 @@ _GLOBAL(flush_hash_patch_B)
8: ble cr1,9f /* if all ptes checked */
81: addi r6,r6,-1
addi r5,r5,4 /* advance to next pte */
addi r5,r5,PTE_SIZE
addi r4,r4,0x1000
lwz r0,0(r5) /* check next pte */
cmpwi cr1,r6,1

4
arch/powerpc/mm/pgtable_32.c
View file

@ -73,7 +73,7 @@ extern unsigned long p_mapped_by_tlbcam(unsigned long pa);
#endif /* HAVE_TLBCAM */
#ifdef CONFIG_PTE_64BIT
/* 44x uses an 8kB pgdir because it has 8-byte Linux PTEs. */
/* Some processors use an 8kB pgdir because they have 8-byte Linux PTEs. */
#define PGDIR_ORDER 1
#else
#define PGDIR_ORDER 0
@ -288,7 +288,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
}
/*
* Map in all of physical memory starting at KERNELBASE.
* Map in a big chunk of physical memory starting at KERNELBASE.
*/
void __init mapin_ram(void)
{

1
arch/powerpc/mm/tlb_32.c
View file

@ -45,6 +45,7 @@ void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
flush_hash_pages(mm->context.id, addr, ptephys, 1);
}
}
EXPORT_SYMBOL(flush_hash_entry);
/*
* Called by ptep_set_access_flags, must flush on CPUs for which the

17
arch/powerpc/platforms/Kconfig.cputype
View file

@ -50,6 +50,7 @@ config 44x
select PPC_UDBG_16550
select 4xx_SOC
select PPC_PCI_CHOICE
select PHYS_64BIT
config E200
bool "Freescale e200"
@ -128,18 +129,20 @@ config FSL_EMB_PERFMON
config PTE_64BIT
bool
depends on 44x || E500
default y if 44x
default y if E500 && PHYS_64BIT
depends on 44x || E500 || PPC_86xx
default y if PHYS_64BIT
config PHYS_64BIT
bool 'Large physical address support' if E500
depends on 44x || E500
bool 'Large physical address support' if E500 || PPC_86xx
depends on (44x || E500 || PPC_86xx) && !PPC_83xx && !PPC_82xx
select RESOURCES_64BIT
default y if 44x
---help---
This option enables kernel support for larger than 32-bit physical
addresses. This features is not be available on all e500 cores.
addresses. This feature may not be available on all cores.
If you have more than 3.5GB of RAM or so, you also need to enable
SWIOTLB under Kernel Options for this to work. The actual number
is platform-dependent.
If in doubt, say N here.