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linux-stable-rt/include/asm-sparc64/tsb.h

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[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
#ifndef _SPARC64_TSB_H
#define _SPARC64_TSB_H
/* The sparc64 TSB is similar to the powerpc hashtables. It's a
* power-of-2 sized table of TAG/PTE pairs. The cpu precomputes
* pointers into this table for 8K and 64K page sizes, and also a
* comparison TAG based upon the virtual address and context which
* faults.
*
* TLB miss trap handler software does the actual lookup via something
* of the form:
*
* ldxa [%g0] ASI_{D,I}MMU_TSB_8KB_PTR, %g1
* ldxa [%g0] ASI_{D,I}MMU, %g6
* ldda [%g1] ASI_NUCLEUS_QUAD_LDD, %g4
* cmp %g4, %g6
* bne,pn %xcc, tsb_miss_{d,i}tlb
* mov FAULT_CODE_{D,I}TLB, %g3
* stxa %g5, [%g0] ASI_{D,I}TLB_DATA_IN
* retry
*
[SPARC64]: Add infrastructure for dynamic TSB sizing. This also cleans up tsb_context_switch(). The assembler routine is now __tsb_context_switch() and the former is an inline function that picks out the bits from the mm_struct and passes it into the assembler code as arguments. setup_tsb_parms() computes the locked TLB entry to map the TSB. Later when we support using the physical address quad load instructions of Cheetah+ and later, we'll simply use the physical address for the TSB register value and set the map virtual and PTE both to zero. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:31:20 +08:00
*
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
* Each 16-byte slot of the TSB is the 8-byte tag and then the 8-byte
* PTE. The TAG is of the same layout as the TLB TAG TARGET mmu
* register which is:
*
* -------------------------------------------------
* | - | CONTEXT | - | VADDR bits 63:22 |
* -------------------------------------------------
* 63 61 60 48 47 42 41 0
*
* Like the powerpc hashtables we need to use locking in order to
* synchronize while we update the entries. PTE updates need locking
* as well.
*
* We need to carefully choose a lock bits for the TSB entry. We
* choose to use bit 47 in the tag. Also, since we never map anything
* at page zero in context zero, we use zero as an invalid tag entry.
* When the lock bit is set, this forces a tag comparison failure.
*/
[SPARC64]: Fix incorrect TSB lock bit handling. The TSB_LOCK_BIT define is actually a special value shifted down by 32-bits for the assembler code macros. In C code, this isn't what we want. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:32:44 +08:00
#define TSB_TAG_LOCK_BIT 47
#define TSB_TAG_LOCK_HIGH (1 << (TSB_TAG_LOCK_BIT - 32))
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
#define TSB_MEMBAR membar #StoreStore
[SPARC64]: Access TSB with physical addresses when possible. This way we don't need to lock the TSB into the TLB. The trick is that every TSB load/store is registered into a special instruction patch section. The default uses virtual addresses, and the patch instructions use physical address load/stores. We can't do this on all chips because only cheetah+ and later have the physical variant of the atomic quad load. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-02 07:55:21 +08:00
/* Some cpus support physical address quad loads. We want to use
* those if possible so we don't need to hard-lock the TSB mapping
* into the TLB. We encode some instruction patching in order to
* support this.
*
* The kernel TSB is locked into the TLB by virtue of being in the
* kernel image, so we don't play these games for swapper_tsb access.
*/
#ifndef __ASSEMBLY__
struct tsb_phys_patch_entry {
unsigned int addr;
unsigned int insn;
};
extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
#endif
#define TSB_LOAD_QUAD(TSB, REG) \
661: ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
ldda [TSB] ASI_QUAD_LDD_PHYS, REG; \
.previous
#define TSB_LOAD_TAG_HIGH(TSB, REG) \
661: lduwa [TSB] ASI_N, REG; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
lduwa [TSB] ASI_PHYS_USE_EC, REG; \
.previous
#define TSB_LOAD_TAG(TSB, REG) \
661: ldxa [TSB] ASI_N, REG; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
ldxa [TSB] ASI_PHYS_USE_EC, REG; \
.previous
#define TSB_CAS_TAG_HIGH(TSB, REG1, REG2) \
661: casa [TSB] ASI_N, REG1, REG2; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
casa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \
.previous
#define TSB_CAS_TAG(TSB, REG1, REG2) \
661: casxa [TSB] ASI_N, REG1, REG2; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
casxa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \
.previous
#define TSB_STORE(ADDR, VAL) \
661: stxa VAL, [ADDR] ASI_N; \
.section .tsb_phys_patch, "ax"; \
.word 661b; \
stxa VAL, [ADDR] ASI_PHYS_USE_EC; \
.previous
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
#define TSB_LOCK_TAG(TSB, REG1, REG2) \
[SPARC64]: Access TSB with physical addresses when possible. This way we don't need to lock the TSB into the TLB. The trick is that every TSB load/store is registered into a special instruction patch section. The default uses virtual addresses, and the patch instructions use physical address load/stores. We can't do this on all chips because only cheetah+ and later have the physical variant of the atomic quad load. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-02 07:55:21 +08:00
99: TSB_LOAD_TAG_HIGH(TSB, REG1); \
sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\
andcc REG1, REG2, %g0; \
bne,pn %icc, 99b; \
nop; \
TSB_CAS_TAG_HIGH(TSB, REG1, REG2); \
cmp REG1, REG2; \
bne,pn %icc, 99b; \
nop; \
TSB_MEMBAR
#define TSB_WRITE(TSB, TTE, TAG) \
add TSB, 0x8, TSB; \
TSB_STORE(TSB, TTE); \
sub TSB, 0x8, TSB; \
TSB_MEMBAR; \
TSB_STORE(TSB, TAG);
#define KTSB_LOAD_QUAD(TSB, REG) \
ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG;
#define KTSB_STORE(ADDR, VAL) \
stxa VAL, [ADDR] ASI_N;
#define KTSB_LOCK_TAG(TSB, REG1, REG2) \
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
99: lduwa [TSB] ASI_N, REG1; \
[SPARC64]: Fix incorrect TSB lock bit handling. The TSB_LOCK_BIT define is actually a special value shifted down by 32-bits for the assembler code macros. In C code, this isn't what we want. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:32:44 +08:00
sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
andcc REG1, REG2, %g0; \
bne,pn %icc, 99b; \
nop; \
casa [TSB] ASI_N, REG1, REG2;\
cmp REG1, REG2; \
bne,pn %icc, 99b; \
nop; \
TSB_MEMBAR
[SPARC64]: Access TSB with physical addresses when possible. This way we don't need to lock the TSB into the TLB. The trick is that every TSB load/store is registered into a special instruction patch section. The default uses virtual addresses, and the patch instructions use physical address load/stores. We can't do this on all chips because only cheetah+ and later have the physical variant of the atomic quad load. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-02 07:55:21 +08:00
#define KTSB_WRITE(TSB, TTE, TAG) \
add TSB, 0x8, TSB; \
stxa TTE, [TSB] ASI_N; \
sub TSB, 0x8, TSB; \
TSB_MEMBAR; \
stxa TAG, [TSB] ASI_N;
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
/* Do a kernel page table walk. Leaves physical PTE pointer in
* REG1. Jumps to FAIL_LABEL on early page table walk termination.
* VADDR will not be clobbered, but REG2 will.
*/
#define KERN_PGTABLE_WALK(VADDR, REG1, REG2, FAIL_LABEL) \
sethi %hi(swapper_pg_dir), REG1; \
or REG1, %lo(swapper_pg_dir), REG1; \
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
andn REG2, 0x3, REG2; \
lduw [REG1 + REG2], REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;
/* Do a user page table walk in MMU globals. Leaves physical PTE
* pointer in REG1. Jumps to FAIL_LABEL on early page table walk
* termination. Physical base of page tables is in PHYS_PGD which
* will not be modified.
*
* VADDR will not be clobbered, but REG1 and REG2 will.
*/
#define USER_PGTABLE_WALK_TL1(VADDR, PHYS_PGD, REG1, REG2, FAIL_LABEL) \
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
andn REG2, 0x3, REG2; \
lduwa [PHYS_PGD + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;
/* Lookup a OBP mapping on VADDR in the prom_trans[] table at TL>0.
* If no entry is found, FAIL_LABEL will be branched to. On success
* the resulting PTE value will be left in REG1. VADDR is preserved
* by this routine.
*/
#define OBP_TRANS_LOOKUP(VADDR, REG1, REG2, REG3, FAIL_LABEL) \
sethi %hi(prom_trans), REG1; \
or REG1, %lo(prom_trans), REG1; \
97: ldx [REG1 + 0x00], REG2; \
brz,pn REG2, FAIL_LABEL; \
nop; \
ldx [REG1 + 0x08], REG3; \
add REG2, REG3, REG3; \
cmp REG2, VADDR; \
bgu,pt %xcc, 98f; \
cmp VADDR, REG3; \
bgeu,pt %xcc, 98f; \
ldx [REG1 + 0x10], REG3; \
sub VADDR, REG2, REG2; \
ba,pt %xcc, 99f; \
add REG3, REG2, REG1; \
98: ba,pt %xcc, 97b; \
add REG1, (3 * 8), REG1; \
99:
[SPARC64]: Increase swapper_tsb size to 32K. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:33:49 +08:00
/* We use a 32K TSB for the whole kernel, this allows to
* handle about 16MB of modules and vmalloc mappings without
* incurring many hash conflicts.
*/
#define KERNEL_TSB_SIZE_BYTES (32 * 1024)
#define KERNEL_TSB_NENTRIES \
(KERNEL_TSB_SIZE_BYTES / 16)
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
/* Do a kernel TSB lookup at tl>0 on VADDR+TAG, branch to OK_LABEL
* on TSB hit. REG1, REG2, REG3, and REG4 are used as temporaries
* and the found TTE will be left in REG1. REG3 and REG4 must
* be an even/odd pair of registers.
*
* VADDR and TAG will be preserved and not clobbered by this macro.
*/
#define KERN_TSB_LOOKUP_TL1(VADDR, TAG, REG1, REG2, REG3, REG4, OK_LABEL) \
sethi %hi(swapper_tsb), REG1; \
or REG1, %lo(swapper_tsb), REG1; \
[SPARC64]: Increase swapper_tsb size to 32K. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:33:49 +08:00
srlx VADDR, PAGE_SHIFT, REG2; \
and REG2, (KERNEL_TSB_NENTRIES - 1), REG2; \
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
sllx REG2, 4, REG2; \
add REG1, REG2, REG2; \
[SPARC64]: Access TSB with physical addresses when possible. This way we don't need to lock the TSB into the TLB. The trick is that every TSB load/store is registered into a special instruction patch section. The default uses virtual addresses, and the patch instructions use physical address load/stores. We can't do this on all chips because only cheetah+ and later have the physical variant of the atomic quad load. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-02 07:55:21 +08:00
KTSB_LOAD_QUAD(REG2, REG3); \
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 10:29:18 +08:00
cmp REG3, TAG; \
be,a,pt %xcc, OK_LABEL; \
mov REG4, REG1;
#endif /* !(_SPARC64_TSB_H) */