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authorDavid S. Miller <davem@sunset.davemloft.net>2006-02-18 02:01:02 (GMT)
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 09:13:34 (GMT)
commit8b234274418d6d79527c4ac3a72da446ca4cb35f (patch)
treeab4ab14fa7f1cab7889ecc2339f0261253a5d0e1
parent7adb37fe80d06cbd40de9b225b12a3a9ec40b6bb (diff)
downloadlinux-8b234274418d6d79527c4ac3a72da446ca4cb35f.tar.xz
[SPARC64]: More TLB/TSB handling fixes.
The SUN4V convention with non-shared TSBs is that the context bit of the TAG is clear. So we have to choose an "invalid" bit and initialize new TSBs appropriately. Otherwise a zero TAG looks "valid". Make sure, for the window fixup cases, that we use the right global registers and that we don't potentially trample on the live global registers in etrap/rtrap handling (%g2 and %g6) and that we put the missing virtual address properly in %g5. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--arch/sparc64/kernel/dtlb_miss.S4
-rw-r--r--arch/sparc64/kernel/itlb_miss.S12
-rw-r--r--arch/sparc64/kernel/ktlb.S14
-rw-r--r--arch/sparc64/kernel/sun4v_tlb_miss.S39
-rw-r--r--arch/sparc64/kernel/tsb.S17
-rw-r--r--arch/sparc64/mm/init.c4
-rw-r--r--arch/sparc64/mm/tsb.c25
-rw-r--r--include/asm-sparc64/tsb.h8
-rw-r--r--include/asm-sparc64/ttable.h12
9 files changed, 78 insertions, 57 deletions
diff --git a/arch/sparc64/kernel/dtlb_miss.S b/arch/sparc64/kernel/dtlb_miss.S
index 2ef6f6e..09a6a15 100644
--- a/arch/sparc64/kernel/dtlb_miss.S
+++ b/arch/sparc64/kernel/dtlb_miss.S
@@ -2,10 +2,10 @@
ldxa [%g0] ASI_DMMU_TSB_8KB_PTR, %g1 ! Get TSB 8K pointer
ldxa [%g0] ASI_DMMU, %g6 ! Get TAG TARGET
srlx %g6, 48, %g5 ! Get context
+ sllx %g6, 22, %g6 ! Zero out context
brz,pn %g5, kvmap_dtlb ! Context 0 processing
- nop ! Delay slot (fill me)
+ srlx %g6, 22, %g6 ! Delay slot
TSB_LOAD_QUAD(%g1, %g4) ! Load TSB entry
- nop ! Push branch to next I$ line
cmp %g4, %g6 ! Compare TAG
/* DTLB ** ICACHE line 2: TSB compare and TLB load */
diff --git a/arch/sparc64/kernel/itlb_miss.S b/arch/sparc64/kernel/itlb_miss.S
index 730caa4..6dfe396 100644
--- a/arch/sparc64/kernel/itlb_miss.S
+++ b/arch/sparc64/kernel/itlb_miss.S
@@ -2,25 +2,25 @@
ldxa [%g0] ASI_IMMU_TSB_8KB_PTR, %g1 ! Get TSB 8K pointer
ldxa [%g0] ASI_IMMU, %g6 ! Get TAG TARGET
srlx %g6, 48, %g5 ! Get context
+ sllx %g6, 22, %g6 ! Zero out context
brz,pn %g5, kvmap_itlb ! Context 0 processing
- nop ! Delay slot (fill me)
+ srlx %g6, 22, %g6 ! Delay slot
TSB_LOAD_QUAD(%g1, %g4) ! Load TSB entry
cmp %g4, %g6 ! Compare TAG
- sethi %hi(PAGE_EXEC), %g4 ! Setup exec check
/* ITLB ** ICACHE line 2: TSB compare and TLB load */
+ sethi %hi(PAGE_EXEC), %g4 ! Setup exec check
ldx [%g4 + %lo(PAGE_EXEC)], %g4
bne,pn %xcc, tsb_miss_itlb ! Miss
mov FAULT_CODE_ITLB, %g3
andcc %g5, %g4, %g0 ! Executable?
be,pn %xcc, tsb_do_fault
nop ! Delay slot, fill me
- stxa %g5, [%g0] ASI_ITLB_DATA_IN ! Load TLB
- retry ! Trap done
+ nop
/* ITLB ** ICACHE line 3: */
- nop
- nop
+ stxa %g5, [%g0] ASI_ITLB_DATA_IN ! Load TLB
+ retry ! Trap done
nop
nop
nop
diff --git a/arch/sparc64/kernel/ktlb.S b/arch/sparc64/kernel/ktlb.S
index 47dfd45..ac29da9 100644
--- a/arch/sparc64/kernel/ktlb.S
+++ b/arch/sparc64/kernel/ktlb.S
@@ -52,8 +52,10 @@ kvmap_itlb_vmalloc_addr:
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
+ mov 1, %g7
+ sllx %g7, TSB_TAG_INVALID_BIT, %g7
brgez,a,pn %g5, kvmap_itlb_longpath
- KTSB_STORE(%g1, %g0)
+ KTSB_STORE(%g1, %g7)
KTSB_WRITE(%g1, %g5, %g6)
@@ -146,8 +148,10 @@ kvmap_dtlb_vmalloc_addr:
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
+ mov 1, %g7
+ sllx %g7, TSB_TAG_INVALID_BIT, %g7
brgez,a,pn %g5, kvmap_dtlb_longpath
- KTSB_STORE(%g1, %g0)
+ KTSB_STORE(%g1, %g7)
KTSB_WRITE(%g1, %g5, %g6)
@@ -215,8 +219,8 @@ kvmap_dtlb_longpath:
wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
.section .sun4v_2insn_patch, "ax"
.word 661b
- nop
- nop
+ SET_GL(1)
+ ldxa [%g0] ASI_SCRATCHPAD, %g5
.previous
rdpr %tl, %g3
@@ -226,7 +230,7 @@ kvmap_dtlb_longpath:
ldxa [%g4] ASI_DMMU, %g5
.section .sun4v_2insn_patch, "ax"
.word 661b
- mov %g4, %g5
+ ldx [%g5 + HV_FAULT_D_ADDR_OFFSET], %g5
nop
.previous
diff --git a/arch/sparc64/kernel/sun4v_tlb_miss.S b/arch/sparc64/kernel/sun4v_tlb_miss.S
index 244d50d..57ccdae 100644
--- a/arch/sparc64/kernel/sun4v_tlb_miss.S
+++ b/arch/sparc64/kernel/sun4v_tlb_miss.S
@@ -16,15 +16,14 @@
ldx [BASE + HV_FAULT_D_ADDR_OFFSET], VADDR; \
ldx [BASE + HV_FAULT_D_CTX_OFFSET], CTX;
- /* DEST = (CTX << 48) | (VADDR >> 22)
+ /* DEST = (VADDR >> 22)
*
* Branch to ZERO_CTX_LABEL is context is zero.
*/
-#define COMPUTE_TAG_TARGET(DEST, VADDR, CTX, TMP, ZERO_CTX_LABEL) \
- srlx VADDR, 22, TMP; \
- sllx CTX, 48, DEST; \
+#define COMPUTE_TAG_TARGET(DEST, VADDR, CTX, ZERO_CTX_LABEL) \
+ srlx VADDR, 22, DEST; \
brz,pn CTX, ZERO_CTX_LABEL; \
- or DEST, TMP, DEST;
+ nop;
/* Create TSB pointer. This is something like:
*
@@ -53,7 +52,7 @@ sun4v_itlb_miss:
ldxa [%g1] ASI_SCRATCHPAD, %g1
LOAD_ITLB_INFO(%g2, %g4, %g5)
- COMPUTE_TAG_TARGET(%g6, %g4, %g5, %g3, kvmap_itlb_4v)
+ COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_itlb_4v)
COMPUTE_TSB_PTR(%g1, %g4, %g3, %g7)
/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
@@ -72,15 +71,15 @@ sun4v_itlb_miss:
*
* %g3: PTE
* %g4: vaddr
- * %g6: TAG TARGET (only "CTX << 48" part matters)
*/
sun4v_itlb_load:
+ ldxa [%g0] ASI_SCRATCHPAD, %g6
mov %o0, %g1 ! save %o0
mov %o1, %g2 ! save %o1
mov %o2, %g5 ! save %o2
mov %o3, %g7 ! save %o3
mov %g4, %o0 ! vaddr
- srlx %g6, 48, %o1 ! ctx
+ ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1 ! ctx
mov %g3, %o2 ! PTE
mov HV_MMU_IMMU, %o3 ! flags
ta HV_MMU_MAP_ADDR_TRAP
@@ -101,7 +100,7 @@ sun4v_dtlb_miss:
ldxa [%g1] ASI_SCRATCHPAD, %g1
LOAD_DTLB_INFO(%g2, %g4, %g5)
- COMPUTE_TAG_TARGET(%g6, %g4, %g5, %g3, kvmap_dtlb_4v)
+ COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_dtlb_4v)
COMPUTE_TSB_PTR(%g1, %g4, %g3, %g7)
/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
@@ -115,15 +114,15 @@ sun4v_dtlb_miss:
*
* %g3: PTE
* %g4: vaddr
- * %g6: TAG TARGET (only "CTX << 48" part matters)
*/
sun4v_dtlb_load:
+ ldxa [%g0] ASI_SCRATCHPAD, %g6
mov %o0, %g1 ! save %o0
mov %o1, %g2 ! save %o1
mov %o2, %g5 ! save %o2
mov %o3, %g7 ! save %o3
mov %g4, %o0 ! vaddr
- srlx %g6, 48, %o1 ! ctx
+ ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1 ! ctx
mov %g3, %o2 ! PTE
mov HV_MMU_DMMU, %o3 ! flags
ta HV_MMU_MAP_ADDR_TRAP
@@ -136,16 +135,18 @@ sun4v_dtlb_load:
retry
sun4v_dtlb_prot:
+ SET_GL(1)
+
/* Load MMU Miss base into %g2. */
- ldxa [%g0] ASI_SCRATCHPAD, %g2
+ ldxa [%g0] ASI_SCRATCHPAD, %g5
- ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g5
+ ldx [%g5 + HV_FAULT_D_ADDR_OFFSET], %g5
rdpr %tl, %g1
cmp %g1, 1
- bgu,pn %xcc, winfix_trampoline
+ bgu,pn %xcc, winfix_trampoline
nop
- ba,pt %xcc, sparc64_realfault_common
- mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
+ ba,pt %xcc, sparc64_realfault_common
+ mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
/* Called from trap table with TAG TARGET placed into
* %g6, SCRATCHPAD_UTSBREG1 contents in %g1, and
@@ -189,7 +190,8 @@ sun4v_itlb_error:
sethi %hi(sun4v_err_itlb_vaddr), %g1
stx %g4, [%g1 + %lo(sun4v_err_itlb_vaddr)]
sethi %hi(sun4v_err_itlb_ctx), %g1
- srlx %g6, 48, %o1 ! ctx
+ ldxa [%g0] ASI_SCRATCHPAD, %g6
+ ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1
stx %o1, [%g1 + %lo(sun4v_err_itlb_ctx)]
sethi %hi(sun4v_err_itlb_pte), %g1
stx %g3, [%g1 + %lo(sun4v_err_itlb_pte)]
@@ -214,7 +216,8 @@ sun4v_dtlb_error:
sethi %hi(sun4v_err_dtlb_vaddr), %g1
stx %g4, [%g1 + %lo(sun4v_err_dtlb_vaddr)]
sethi %hi(sun4v_err_dtlb_ctx), %g1
- srlx %g6, 48, %o1 ! ctx
+ ldxa [%g0] ASI_SCRATCHPAD, %g6
+ ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1
stx %o1, [%g1 + %lo(sun4v_err_dtlb_ctx)]
sethi %hi(sun4v_err_dtlb_pte), %g1
stx %g3, [%g1 + %lo(sun4v_err_dtlb_pte)]
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
index a17259c..cc225c0 100644
--- a/arch/sparc64/kernel/tsb.S
+++ b/arch/sparc64/kernel/tsb.S
@@ -36,7 +36,7 @@ tsb_miss_itlb:
/* At this point we have:
* %g4 -- missing virtual address
* %g1 -- TSB entry address
- * %g6 -- TAG TARGET ((vaddr >> 22) | (ctx << 48))
+ * %g6 -- TAG TARGET (vaddr >> 22)
*/
tsb_miss_page_table_walk:
TRAP_LOAD_PGD_PHYS(%g7, %g5)
@@ -50,8 +50,10 @@ tsb_reload:
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
+ mov 1, %g7
+ sllx %g7, TSB_TAG_INVALID_BIT, %g7
brgez,a,pn %g5, tsb_do_fault
- TSB_STORE(%g1, %g0)
+ TSB_STORE(%g1, %g7)
/* If it is larger than the base page size, don't
* bother putting it into the TSB.
@@ -62,8 +64,10 @@ tsb_reload:
sethi %hi(_PAGE_SZBITS), %g7
ldx [%g7 + %lo(_PAGE_SZBITS)], %g7
cmp %g2, %g7
+ mov 1, %g7
+ sllx %g7, TSB_TAG_INVALID_BIT, %g7
bne,a,pn %xcc, tsb_tlb_reload
- TSB_STORE(%g1, %g0)
+ TSB_STORE(%g1, %g7)
TSB_WRITE(%g1, %g5, %g6)
@@ -136,7 +140,7 @@ tsb_do_fault:
.section .sun4v_2insn_patch, "ax"
.word 661b
SET_GL(1)
- ldxa [%g0] ASI_SCRATCHPAD, %g2
+ ldxa [%g0] ASI_SCRATCHPAD, %g4
.previous
bne,pn %xcc, tsb_do_itlb_fault
@@ -150,7 +154,7 @@ tsb_do_dtlb_fault:
ldxa [%g4] ASI_DMMU, %g5
.section .sun4v_2insn_patch, "ax"
.word 661b
- ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g5
+ ldx [%g4 + HV_FAULT_D_ADDR_OFFSET], %g5
nop
.previous
@@ -217,8 +221,9 @@ tsb_flush:
bne,pn %icc, 1b
membar #LoadLoad
cmp %g1, %o1
+ mov 1, %o3
bne,pt %xcc, 2f
- clr %o3
+ sllx %o3, TSB_TAG_INVALID_BIT, %o3
TSB_CAS_TAG(%o0, %g1, %o3)
cmp %g1, %o3
bne,pn %xcc, 1b
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index bd9e320..aa2aec6 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -296,7 +296,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t p
tsb = &mm->context.tsb[(address >> PAGE_SHIFT) &
(mm->context.tsb_nentries - 1UL)];
- tag = (address >> 22UL) | CTX_HWBITS(mm->context) << 48UL;
+ tag = (address >> 22UL);
tsb_insert(tsb, tag, pte_val(pte));
}
}
@@ -1110,6 +1110,8 @@ void __init paging_init(void)
kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
+ memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
+
if (tlb_type == hypervisor)
sun4v_pgprot_init();
else
diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 3c1ff05..353cb06 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -20,9 +20,9 @@ static inline unsigned long tsb_hash(unsigned long vaddr, unsigned long nentries
return vaddr & (nentries - 1);
}
-static inline int tag_compare(unsigned long tag, unsigned long vaddr, unsigned long context)
+static inline int tag_compare(unsigned long tag, unsigned long vaddr)
{
- return (tag == ((vaddr >> 22) | (context << 48)));
+ return (tag == (vaddr >> 22));
}
/* TSB flushes need only occur on the processor initiating the address
@@ -38,8 +38,8 @@ void flush_tsb_kernel_range(unsigned long start, unsigned long end)
unsigned long hash = tsb_hash(v, KERNEL_TSB_NENTRIES);
struct tsb *ent = &swapper_tsb[hash];
- if (tag_compare(ent->tag, v, 0)) {
- ent->tag = 0UL;
+ if (tag_compare(ent->tag, v)) {
+ ent->tag = (1UL << TSB_TAG_INVALID_BIT);
membar_storeload_storestore();
}
}
@@ -50,14 +50,9 @@ void flush_tsb_user(struct mmu_gather *mp)
struct mm_struct *mm = mp->mm;
struct tsb *tsb = mm->context.tsb;
unsigned long nentries = mm->context.tsb_nentries;
- unsigned long ctx, base;
+ unsigned long base;
int i;
- if (unlikely(!CTX_VALID(mm->context)))
- return;
-
- ctx = CTX_HWBITS(mm->context);
-
if (tlb_type == cheetah_plus || tlb_type == hypervisor)
base = __pa(tsb);
else
@@ -71,7 +66,7 @@ void flush_tsb_user(struct mmu_gather *mp)
hash = tsb_hash(v, nentries);
ent = base + (hash * sizeof(struct tsb));
- tag = (v >> 22UL) | (ctx << 48UL);
+ tag = (v >> 22UL);
tsb_flush(ent, tag);
}
@@ -243,7 +238,8 @@ static void copy_tsb(struct tsb *old_tsb, unsigned long old_size,
"i" (ASI_NUCLEUS_QUAD_LDD));
}
- if (!tag || (tag & (1UL << TSB_TAG_LOCK_BIT)))
+ if (tag & ((1UL << TSB_TAG_LOCK_BIT) |
+ (1UL << TSB_TAG_INVALID_BIT)))
continue;
/* We only put base page size PTEs into the TSB,
@@ -315,10 +311,13 @@ void tsb_grow(struct mm_struct *mm, unsigned long rss, gfp_t gfp_flags)
break;
}
- page = alloc_pages(gfp_flags | __GFP_ZERO, get_order(size));
+ page = alloc_pages(gfp_flags, get_order(size));
if (unlikely(!page))
return;
+ /* Mark all tags as invalid. */
+ memset(page_address(page), 0x40, size);
+
if (size == max_tsb_size)
mm->context.tsb_rss_limit = ~0UL;
else
diff --git a/include/asm-sparc64/tsb.h b/include/asm-sparc64/tsb.h
index 7f3abc3..6e67680 100644
--- a/include/asm-sparc64/tsb.h
+++ b/include/asm-sparc64/tsb.h
@@ -12,6 +12,8 @@
*
* ldxa [%g0] ASI_{D,I}MMU_TSB_8KB_PTR, %g1
* ldxa [%g0] ASI_{D,I}MMU, %g6
+ * sllx %g6, 22, %g6
+ * srlx %g6, 22, %g6
* ldda [%g1] ASI_NUCLEUS_QUAD_LDD, %g4
* cmp %g4, %g6
* bne,pn %xcc, tsb_miss_{d,i}tlb
@@ -29,6 +31,9 @@
* -------------------------------------------------
* 63 61 60 48 47 42 41 0
*
+ * But actually, since we use per-mm TSB's, we zero out the CONTEXT
+ * field.
+ *
* Like the powerpc hashtables we need to use locking in order to
* synchronize while we update the entries. PTE updates need locking
* as well.
@@ -42,6 +47,9 @@
#define TSB_TAG_LOCK_BIT 47
#define TSB_TAG_LOCK_HIGH (1 << (TSB_TAG_LOCK_BIT - 32))
+#define TSB_TAG_INVALID_BIT 46
+#define TSB_TAG_INVALID_HIGH (1 << (TSB_TAG_INVALID_BIT - 32))
+
#define TSB_MEMBAR membar #StoreStore
/* Some cpus support physical address quad loads. We want to use
diff --git a/include/asm-sparc64/ttable.h b/include/asm-sparc64/ttable.h
index 9e28b24..2d5e3c4 100644
--- a/include/asm-sparc64/ttable.h
+++ b/include/asm-sparc64/ttable.h
@@ -184,20 +184,20 @@
ldxa [%g0] ASI_SCRATCHPAD, %g2; \
ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4; \
ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5; \
- srlx %g4, 22, %g7; \
- sllx %g5, 48, %g6; \
+ srlx %g4, 22, %g6; \
ba,pt %xcc, sun4v_itsb_miss; \
- or %g6, %g7, %g6; \
+ nop; \
+ nop; \
nop;
#define SUN4V_DTSB_MISS \
ldxa [%g0] ASI_SCRATCHPAD, %g2; \
ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4; \
ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5; \
- srlx %g4, 22, %g7; \
- sllx %g5, 48, %g6; \
+ srlx %g4, 22, %g6; \
ba,pt %xcc, sun4v_dtsb_miss; \
- or %g6, %g7, %g6; \
+ nop; \
+ nop; \
nop;
/* Before touching these macros, you owe it to yourself to go and