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authorDavid Daney <ddaney@caviumnetworks.com>2010-12-20 15:54:50 -0800
committerRalf Baechle <ralf@linux-mips.org>2011-01-18 19:30:23 +0100
commitcc33ae437975416a1b78f99e2715e91ab643526a (patch)
tree958e4165ddcd45bf6ba9c498fa8f736dcbcbe770
parentafc7c9864a2d1b0c398425aac84b8a095c8dfa7c (diff)
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MIPS: Use BBIT instructions in TLB handlers
If the CPU supports BBIT0 and BBIT1, use them in TLB handlers as they are more efficient than an AND followed by an branch and then restoring the clobbered register. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1873/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/mm/tlbex.c119
1 files changed, 90 insertions, 29 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 0bb4c3b..883cf76 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -65,6 +65,18 @@ static inline int __maybe_unused r10000_llsc_war(void)
return R10000_LLSC_WAR;
}
+static int use_bbit_insns(void)
+{
+ switch (current_cpu_type()) {
+ case CPU_CAVIUM_OCTEON:
+ case CPU_CAVIUM_OCTEON_PLUS:
+ case CPU_CAVIUM_OCTEON2:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
/*
* Found by experiment: At least some revisions of the 4kc throw under
* some circumstances a machine check exception, triggered by invalid
@@ -511,8 +523,12 @@ build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp,
unsigned int pmd, int lid)
{
UASM_i_LW(p, tmp, 0, pmd);
- uasm_i_andi(p, tmp, tmp, _PAGE_HUGE);
- uasm_il_bnez(p, r, tmp, lid);
+ if (use_bbit_insns()) {
+ uasm_il_bbit1(p, r, tmp, ilog2(_PAGE_HUGE), lid);
+ } else {
+ uasm_i_andi(p, tmp, tmp, _PAGE_HUGE);
+ uasm_il_bnez(p, r, tmp, lid);
+ }
}
static __cpuinit void build_huge_update_entries(u32 **p,
@@ -1187,14 +1203,20 @@ build_pte_present(u32 **p, struct uasm_reloc **r,
unsigned int pte, unsigned int ptr, enum label_id lid)
{
if (kernel_uses_smartmips_rixi) {
- uasm_i_andi(p, pte, pte, _PAGE_PRESENT);
- uasm_il_beqz(p, r, pte, lid);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
+ uasm_i_nop(p);
+ } else {
+ uasm_i_andi(p, pte, pte, _PAGE_PRESENT);
+ uasm_il_beqz(p, r, pte, lid);
+ iPTE_LW(p, pte, ptr);
+ }
} else {
uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
uasm_il_bnez(p, r, pte, lid);
+ iPTE_LW(p, pte, ptr);
}
- iPTE_LW(p, pte, ptr);
}
/* Make PTE valid, store result in PTR. */
@@ -1215,10 +1237,17 @@ static void __cpuinit
build_pte_writable(u32 **p, struct uasm_reloc **r,
unsigned int pte, unsigned int ptr, enum label_id lid)
{
- uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
- uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
- uasm_il_bnez(p, r, pte, lid);
- iPTE_LW(p, pte, ptr);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
+ uasm_i_nop(p);
+ uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid);
+ uasm_i_nop(p);
+ } else {
+ uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
+ uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
+ uasm_il_bnez(p, r, pte, lid);
+ iPTE_LW(p, pte, ptr);
+ }
}
/* Make PTE writable, update software status bits as well, then store
@@ -1242,9 +1271,14 @@ static void __cpuinit
build_pte_modifiable(u32 **p, struct uasm_reloc **r,
unsigned int pte, unsigned int ptr, enum label_id lid)
{
- uasm_i_andi(p, pte, pte, _PAGE_WRITE);
- uasm_il_beqz(p, r, pte, lid);
- iPTE_LW(p, pte, ptr);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid);
+ uasm_i_nop(p);
+ } else {
+ uasm_i_andi(p, pte, pte, _PAGE_WRITE);
+ uasm_il_beqz(p, r, pte, lid);
+ iPTE_LW(p, pte, ptr);
+ }
}
#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
@@ -1491,14 +1525,23 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
* If the page is not _PAGE_VALID, RI or XI could not
* have triggered it. Skip the expensive test..
*/
- uasm_i_andi(&p, K0, K0, _PAGE_VALID);
- uasm_il_beqz(&p, &r, K0, label_tlbl_goaround1);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(&p, &r, K0, ilog2(_PAGE_VALID),
+ label_tlbl_goaround1);
+ } else {
+ uasm_i_andi(&p, K0, K0, _PAGE_VALID);
+ uasm_il_beqz(&p, &r, K0, label_tlbl_goaround1);
+ }
uasm_i_nop(&p);
uasm_i_tlbr(&p);
/* Examine entrylo 0 or 1 based on ptr. */
- uasm_i_andi(&p, K0, K1, sizeof(pte_t));
- uasm_i_beqz(&p, K0, 8);
+ if (use_bbit_insns()) {
+ uasm_i_bbit0(&p, K1, ilog2(sizeof(pte_t)), 8);
+ } else {
+ uasm_i_andi(&p, K0, K1, sizeof(pte_t));
+ uasm_i_beqz(&p, K0, 8);
+ }
UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/
UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */
@@ -1506,12 +1549,18 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
* If the entryLo (now in K0) is valid (bit 1), RI or
* XI must have triggered it.
*/
- uasm_i_andi(&p, K0, K0, 2);
- uasm_il_bnez(&p, &r, K0, label_nopage_tlbl);
-
- uasm_l_tlbl_goaround1(&l, p);
- /* Reload the PTE value */
- iPTE_LW(&p, K0, K1);
+ if (use_bbit_insns()) {
+ uasm_il_bbit1(&p, &r, K0, 1, label_nopage_tlbl);
+ /* Reload the PTE value */
+ iPTE_LW(&p, K0, K1);
+ uasm_l_tlbl_goaround1(&l, p);
+ } else {
+ uasm_i_andi(&p, K0, K0, 2);
+ uasm_il_bnez(&p, &r, K0, label_nopage_tlbl);
+ uasm_l_tlbl_goaround1(&l, p);
+ /* Reload the PTE value */
+ iPTE_LW(&p, K0, K1);
+ }
}
build_make_valid(&p, &r, K0, K1);
build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
@@ -1531,23 +1580,35 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
* If the page is not _PAGE_VALID, RI or XI could not
* have triggered it. Skip the expensive test..
*/
- uasm_i_andi(&p, K0, K0, _PAGE_VALID);
- uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(&p, &r, K0, ilog2(_PAGE_VALID),
+ label_tlbl_goaround2);
+ } else {
+ uasm_i_andi(&p, K0, K0, _PAGE_VALID);
+ uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
+ }
uasm_i_nop(&p);
uasm_i_tlbr(&p);
/* Examine entrylo 0 or 1 based on ptr. */
- uasm_i_andi(&p, K0, K1, sizeof(pte_t));
- uasm_i_beqz(&p, K0, 8);
-
+ if (use_bbit_insns()) {
+ uasm_i_bbit0(&p, K1, ilog2(sizeof(pte_t)), 8);
+ } else {
+ uasm_i_andi(&p, K0, K1, sizeof(pte_t));
+ uasm_i_beqz(&p, K0, 8);
+ }
UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/
UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */
/*
* If the entryLo (now in K0) is valid (bit 1), RI or
* XI must have triggered it.
*/
- uasm_i_andi(&p, K0, K0, 2);
- uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
+ if (use_bbit_insns()) {
+ uasm_il_bbit0(&p, &r, K0, 1, label_tlbl_goaround2);
+ } else {
+ uasm_i_andi(&p, K0, K0, 2);
+ uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
+ }
/* Reload the PTE value */
iPTE_LW(&p, K0, K1);