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[SPARC64]: Initial sun4v TLB miss handling infrastructure.

Browse source 
Things are a little tricky because, unlike sun4u, we have
to:

1) do a hypervisor trap to do the TLB load.
2) do the TSB lookup calculations by hand

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-02-06 23:44:37 -08:00
parent 840aaef8db
commit d257d5da39
8 changed files with 349 additions and 18 deletions
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1
arch/sparc64/kernel/head.S
View file

@ -474,6 +474,7 @@ setup_tba:
sparc64_boot_end:
#include "systbls.S"
#include "sun4v_tlb_miss.S"
#include "ktlb.S"
#include "tsb.S"
#include "etrap.S"

12
arch/sparc64/kernel/ktlb.S
View file

@ -16,12 +16,16 @@
.text
.align 32
.globl kvmap_itlb
kvmap_itlb:
/* g6: TAG TARGET */
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_IMMU, %g4
/* sun4v_itlb_miss branches here with the missing virtual
* address already loaded into %g4
*/
kvmap_itlb_4v:
kvmap_itlb_nonlinear:
/* Catch kernel NULL pointer calls. */
sethi %hi(PAGE_SIZE), %g5
@ -94,11 +98,15 @@ kvmap_dtlb_obp:
nop
.align 32
.globl kvmap_dtlb
kvmap_dtlb:
/* %g6: TAG TARGET */
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_DMMU, %g4
/* sun4v_dtlb_miss branches here with the missing virtual
* address already loaded into %g4
*/
kvmap_dtlb_4v:
brgez,pn %g4, kvmap_dtlb_nonlinear
nop

219
arch/sparc64/kernel/sun4v_tlb_miss.S Normal file
View file

@ -0,0 +1,219 @@
/* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
*
* Copyright (C) 2006 <davem@davemloft.net>
*/
.text
.align 32
sun4v_itlb_miss:
/* Load CPU ID into %g3. */
mov SCRATCHPAD_CPUID, %g1
ldxa [%g1] ASI_SCRATCHPAD, %g3
/* Load UTSB reg into %g1. */
ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
/* Load &trap_block[smp_processor_id()] into %g2. */
sethi %hi(trap_block), %g2
or %g2, %lo(trap_block), %g2
sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
add %g2, %g3, %g2
/* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
* Branch if kernel TLB miss. The kernel TSB and user TSB miss
* code wants the missing virtual address in %g4, so that value
* cannot be modified through the entirety of this handler.
*/
ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_ADDR_OFFSET], %g4
ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_CTX_OFFSET], %g5
srlx %g4, 22, %g3
sllx %g5, 48, %g6
or %g6, %g3, %g6
brz,pn %g5, kvmap_itlb_4v
nop
/* Create TSB pointer. This is something like:
*
* index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
* tsb_base = tsb_reg & ~0x7UL;
*/
and %g1, 0x7, %g3
andn %g1, 0x7, %g1
mov 512, %g7
sllx %g7, %g3, %g7
sub %g7, 1, %g7
/* TSB index mask is in %g7, tsb base is in %g1. Compute
* the TSB entry pointer into %g1:
*
* tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
* tsb_ptr = tsb_base + (tsb_index * 16);
*/
srlx %g4, PAGE_SHIFT, %g3
and %g3, %g7, %g3
sllx %g3, 4, %g3
add %g1, %g3, %g1
/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
cmp %g2, %g6
sethi %hi(_PAGE_EXEC), %g7
bne,a,pn %xcc, tsb_miss_page_table_walk
mov FAULT_CODE_ITLB, %g3
andcc %g3, %g7, %g0
be,a,pn %xcc, tsb_do_fault
mov FAULT_CODE_ITLB, %g3
/* We have a valid entry, make hypervisor call to load
* I-TLB and return from trap.
*
* %g3: PTE
* %g4: vaddr
* %g6: TAG TARGET (only "CTX << 48" part matters)
*/
sun4v_itlb_load:
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
mov %g3, %o2 ! PTE
mov HV_MMU_IMMU, %o3 ! flags
ta HV_MMU_MAP_ADDR_TRAP
mov %g1, %o0 ! restore %o0
mov %g2, %o1 ! restore %o1
mov %g5, %o2 ! restore %o2
mov %g7, %o3 ! restore %o3
retry
sun4v_dtlb_miss:
/* Load CPU ID into %g3. */
mov SCRATCHPAD_CPUID, %g1
ldxa [%g1] ASI_SCRATCHPAD, %g3
/* Load UTSB reg into %g1. */
ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
/* Load &trap_block[smp_processor_id()] into %g2. */
sethi %hi(trap_block), %g2
or %g2, %lo(trap_block), %g2
sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
add %g2, %g3, %g2
/* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
* Branch if kernel TLB miss. The kernel TSB and user TSB miss
* code wants the missing virtual address in %g4, so that value
* cannot be modified through the entirety of this handler.
*/
ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g4
ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_CTX_OFFSET], %g5
srlx %g4, 22, %g3
sllx %g5, 48, %g6
or %g6, %g3, %g6
brz,pn %g5, kvmap_dtlb_4v
nop
/* Create TSB pointer. This is something like:
*
* index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
* tsb_base = tsb_reg & ~0x7UL;
*/
and %g1, 0x7, %g3
andn %g1, 0x7, %g1
mov 512, %g7
sllx %g7, %g3, %g7
sub %g7, 1, %g7
/* TSB index mask is in %g7, tsb base is in %g1. Compute
* the TSB entry pointer into %g1:
*
* tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
* tsb_ptr = tsb_base + (tsb_index * 16);
*/
srlx %g4, PAGE_SHIFT, %g3
and %g3, %g7, %g3
sllx %g3, 4, %g3
add %g1, %g3, %g1
/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
cmp %g2, %g6
bne,a,pn %xcc, tsb_miss_page_table_walk
mov FAULT_CODE_ITLB, %g3
/* We have a valid entry, make hypervisor call to load
* D-TLB and return from trap.
*
* %g3: PTE
* %g4: vaddr
* %g6: TAG TARGET (only "CTX << 48" part matters)
*/
sun4v_dtlb_load:
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
mov %g3, %o2 ! PTE
mov HV_MMU_DMMU, %o3 ! flags
ta HV_MMU_MAP_ADDR_TRAP
mov %g1, %o0 ! restore %o0
mov %g2, %o1 ! restore %o1
mov %g5, %o2 ! restore %o2
mov %g7, %o3 ! restore %o3
retry
sun4v_dtlb_prot:
/* Load CPU ID into %g3. */
mov SCRATCHPAD_CPUID, %g1
ldxa [%g1] ASI_SCRATCHPAD, %g3
/* Load &trap_block[smp_processor_id()] into %g2. */
sethi %hi(trap_block), %g2
or %g2, %lo(trap_block), %g2
sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
add %g2, %g3, %g2
ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g5
rdpr %tl, %g1
cmp %g1, 1
bgu,pn %xcc, winfix_trampoline
nop
ba,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
#define BRANCH_ALWAYS 0x10680000
#define NOP 0x01000000
#define SUN4V_DO_PATCH(OLD, NEW) \
sethi %hi(NEW), %g1; \
or %g1, %lo(NEW), %g1; \
sethi %hi(OLD), %g2; \
or %g2, %lo(OLD), %g2; \
sub %g1, %g2, %g1; \
sethi %hi(BRANCH_ALWAYS), %g3; \
srl %g1, 2, %g1; \
or %g3, %lo(BRANCH_ALWAYS), %g3; \
or %g3, %g1, %g3; \
stw %g3, [%g2]; \
sethi %hi(NOP), %g3; \
or %g3, %lo(NOP), %g3; \
stw %g3, [%g2 + 0x4]; \
flush %g2;
.globl sun4v_patch_tlb_handlers
.type sun4v_patch_tlb_handlers,#function
sun4v_patch_tlb_handlers:
SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
retl
nop
.size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers

89
arch/sparc64/kernel/tsb.S
View file

@ -18,30 +18,33 @@
* %g4: available temporary
* %g5: available temporary
* %g6: TAG TARGET
* %g7: physical address base of the linux page
* %g7: available temporary, will be loaded by us with
* the physical address base of the linux page
* tables for the current address space
*/
.globl tsb_miss_dtlb
tsb_miss_dtlb:
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_DMMU, %g4
ba,pt %xcc, tsb_miss_page_table_walk
nop
.globl tsb_miss_itlb
tsb_miss_itlb:
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_IMMU, %g4
ba,pt %xcc, tsb_miss_page_table_walk
nop
/* The sun4v TLB miss handlers jump directly here instead
* of tsb_miss_{d,i}tlb with the missing virtual address
* already loaded into %g4.
*/
tsb_miss_page_table_walk:
TRAP_LOAD_PGD_PHYS(%g7, %g5)
USER_PGTABLE_WALK_TL1(%g4, %g7, %g5, %g2, tsb_do_fault)
tsb_reload:
TSB_LOCK_TAG(%g1, %g2, %g4)
TSB_LOCK_TAG(%g1, %g2, %g7)
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
@ -52,9 +55,9 @@ tsb_reload:
* bother putting it into the TSB.
*/
srlx %g5, 32, %g2
sethi %hi(_PAGE_ALL_SZ_BITS >> 32), %g4
sethi %hi(_PAGE_ALL_SZ_BITS >> 32), %g7
and %g2, %g7, %g2
sethi %hi(_PAGE_SZBITS >> 32), %g7
and %g2, %g4, %g2
cmp %g2, %g7
bne,a,pn %xcc, tsb_tlb_reload
TSB_STORE(%g1, %g0)
@ -68,12 +71,54 @@ tsb_tlb_reload:
nop
tsb_dtlb_load:
stxa %g5, [%g0] ASI_DTLB_DATA_IN
661: stxa %g5, [%g0] ASI_DTLB_DATA_IN
retry
.section .gl_2insn_patch, "ax"
.word 661b
nop
nop
.previous
/* For sun4v the ASI_DTLB_DATA_IN store and the retry
* instruction get nop'd out and we get here to branch
* to the sun4v tlb load code. The registers are setup
* as follows:
*
* %g4: vaddr
* %g5: PTE
* %g6: TAG
*
* The sun4v TLB load wants the PTE in %g3 so we fix that
* up here.
*/
ba,pt %xcc, sun4v_dtlb_load
mov %g5, %g3
tsb_itlb_load:
stxa %g5, [%g0] ASI_ITLB_DATA_IN
661: stxa %g5, [%g0] ASI_ITLB_DATA_IN
retry
.section .gl_2insn_patch, "ax"
.word 661b
nop
nop
.previous
/* For sun4v the ASI_ITLB_DATA_IN store and the retry
* instruction get nop'd out and we get here to branch
* to the sun4v tlb load code. The registers are setup
* as follows:
*
* %g4: vaddr
* %g5: PTE
* %g6: TAG
*
* The sun4v TLB load wants the PTE in %g3 so we fix that
* up here.
*/
ba,pt %xcc, sun4v_itlb_load
mov %g5, %g3
/* No valid entry in the page tables, do full fault
* processing.
@ -95,10 +140,17 @@ tsb_do_fault:
nop
tsb_do_dtlb_fault:
rdpr %tl, %g4
cmp %g4, 1
mov TLB_TAG_ACCESS, %g4
rdpr %tl, %g3
cmp %g3, 1
661: mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_DMMU, %g5
.section .gl_2insn_patch, "ax"
.word 661b
mov %g4, %g5
nop
.previous
be,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_DTLB, %g4
ba,pt %xcc, winfix_trampoline
@ -196,12 +248,23 @@ __tsb_context_switch:
add %g2, %g1, %g2
stx %o0, [%g2 + TRAP_PER_CPU_PGD_PADDR]
mov TSB_REG, %g1
661: mov TSB_REG, %g1
stxa %o1, [%g1] ASI_DMMU
.section .gl_2insn_patch, "ax"
.word 661b
mov SCRATCHPAD_UTSBREG1, %g1
stxa %o1, [%g1] ASI_SCRATCHPAD
.previous
membar #Sync
stxa %o1, [%g1] ASI_IMMU
661: stxa %o1, [%g1] ASI_IMMU
membar #Sync
.section .gl_2insn_patch, "ax"
.word 661b
nop
nop
.previous
brz %o2, 9f
nop

3
arch/sparc64/kernel/vmlinux.lds.S
View file

@ -71,6 +71,9 @@ SECTIONS
__con_initcall_end = .;
SECURITY_INIT
. = ALIGN(4);
__tsb_ldquad_phys_patch = .;
.tsb_ldquad_phys_patch : { *(.tsb_ldquad_phys_patch) }
__tsb_ldquad_phys_patch_end = .;
__tsb_phys_patch = .;
.tsb_phys_patch : { *(.tsb_phys_patch) }
__tsb_phys_patch_end = .;

24
arch/sparc64/mm/init.c
View file

@ -1050,8 +1050,25 @@ unsigned long __init find_ecache_flush_span(unsigned long size)
static void __init tsb_phys_patch(void)
{
struct tsb_ldquad_phys_patch_entry *pquad;
struct tsb_phys_patch_entry *p;
pquad = &__tsb_ldquad_phys_patch;
while (pquad < &__tsb_ldquad_phys_patch_end) {
unsigned long addr = pquad->addr;
if (tlb_type == hypervisor)
*(unsigned int *) addr = pquad->sun4v_insn;
else
*(unsigned int *) addr = pquad->sun4u_insn;
wmb();
__asm__ __volatile__("flush %0"
: /* no outputs */
: "r" (addr));
pquad++;
}
p = &__tsb_phys_patch;
while (p < &__tsb_phys_patch_end) {
unsigned long addr = p->addr;
@ -1069,6 +1086,7 @@ static void __init tsb_phys_patch(void)
/* paging_init() sets up the page tables */
extern void cheetah_ecache_flush_init(void);
extern void sun4v_patch_tlb_handlers(void);
static unsigned long last_valid_pfn;
pgd_t swapper_pg_dir[2048];
@ -1078,9 +1096,13 @@ void __init paging_init(void)
unsigned long end_pfn, pages_avail, shift;
unsigned long real_end, i;
if (tlb_type == cheetah_plus)
if (tlb_type == cheetah_plus ||
tlb_type == hypervisor)
tsb_phys_patch();
if (tlb_type == hypervisor)
sun4v_patch_tlb_handlers();
/* Find available physical memory... */
read_obp_memory("available", &pavail[0], &pavail_ents);

8
include/asm-sparc64/cpudata.h
View file

@ -6,6 +6,8 @@
#ifndef _SPARC64_CPUDATA_H
#define _SPARC64_CPUDATA_H
#include <asm/hypervisor.h>
#ifndef __ASSEMBLY__
#include <linux/percpu.h>
@ -57,6 +59,9 @@ struct trap_per_cpu {
/* D-cache line 2 */
unsigned long __pad2[4];
/* Dcache lines 3 and 4 */
struct hv_fault_status fault_info;
} __attribute__((aligned(64)));
extern struct trap_per_cpu trap_block[NR_CPUS];
extern void init_cur_cpu_trap(void);
@ -88,8 +93,9 @@ extern struct gl_2insn_patch_entry __gl_2insn_patch, __gl_2insn_patch_end;
#define TRAP_PER_CPU_THREAD 0x00
#define TRAP_PER_CPU_PGD_PADDR 0x08
#define TRAP_PER_CPU_FAULT_INFO 0x20
#define TRAP_BLOCK_SZ_SHIFT 6
#define TRAP_BLOCK_SZ_SHIFT 7
#include <asm/scratchpad.h>

11
include/asm-sparc64/tsb.h
View file

@ -53,6 +53,14 @@
* kernel image, so we don't play these games for swapper_tsb access.
*/
#ifndef __ASSEMBLY__
struct tsb_ldquad_phys_patch_entry {
unsigned int addr;
unsigned int sun4u_insn;
unsigned int sun4v_insn;
};
extern struct tsb_ldquad_phys_patch_entry __tsb_ldquad_phys_patch,
__tsb_ldquad_phys_patch_end;
struct tsb_phys_patch_entry {
unsigned int addr;
unsigned int insn;
@ -61,9 +69,10 @@ 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"; \
.section .tsb_ldquad_phys_patch, "ax"; \
.word 661b; \
ldda [TSB] ASI_QUAD_LDD_PHYS, REG; \
ldda [TSB] ASI_QUAD_LDD_PHYS_4V, REG; \
.previous
#define TSB_LOAD_TAG_HIGH(TSB, REG) \