* [PATCH RESEND 2/4] MIPS: Check TLB before handle_ri_rdhwr() for Loongson-3
2017-01-21 0:56 [PATCH RESEND 1/4] MIPS: Add MIPS_CPU_FTLB for Loongson-3A R2 Huacai Chen
@ 2017-01-21 0:56 ` Huacai Chen
2017-01-21 0:56 ` [PATCH RESEND 3/4] MIPS: Flush wrong invalid FTLB entry for huge page Huacai Chen
2017-01-21 0:56 ` [PATCH RESEND 4/4] MIPS: Ensure pmd_present() returns false after pmd_mknotpresent() Huacai Chen
2 siblings, 0 replies; 4+ messages in thread
From: Huacai Chen @ 2017-01-21 0:56 UTC (permalink / raw)
To: Ralf Baechle
Cc: John Crispin, Steven J . Hill, linux-mips, Fuxin Zhang,
Zhangjin Wu, Huacai Chen, stable, Rui Wang
Loongson-3's micro TLB (ITLB) is not strictly a subset of JTLB. That
means: when a JTLB entry is replaced by hardware, there may be an old
valid entry exists in ITLB. So, a TLB miss exception may occur while
handle_ri_rdhwr() is running because it try to access EPC's content.
However, handle_ri_rdhwr() doesn't clear EXL, which makes a TLB Refill
exception be treated as a TLB Invalid exception and tlbp may fail. In
this case, if FTLB (which is usually set-associative instead of set-
associative) is enabled, a tlbp failure will cause an invalid tlbwi,
which will hang the whole system.
This patch rename handle_ri_rdhwr_vivt to handle_ri_rdhwr_tlbp and use
it for Loongson-3. It try to solve the same problem described as below,
but more straightforwards.
https://patchwork.linux-mips.org/patch/12591/
I think Loongson-2 has the same problem, but it has no FTLB, so we just
keep it as is.
Cc: <stable@vger.kernel.org>
Cc: Rui Wang <wangr@lemote.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
---
arch/mips/kernel/genex.S | 4 ++--
arch/mips/kernel/traps.c | 17 +++++++++++++----
2 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index 0a7ba4b..3a98ef6 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -519,7 +519,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
BUILD_HANDLER reserved reserved sti verbose /* others */
.align 5
- LEAF(handle_ri_rdhwr_vivt)
+ LEAF(handle_ri_rdhwr_tlbp)
.set push
.set noat
.set noreorder
@@ -538,7 +538,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
.set pop
bltz k1, handle_ri /* slow path */
/* fall thru */
- END(handle_ri_rdhwr_vivt)
+ END(handle_ri_rdhwr_tlbp)
LEAF(handle_ri_rdhwr)
.set push
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index cb479be3..0ed01a3 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -82,7 +82,7 @@ extern asmlinkage void handle_dbe(void);
extern asmlinkage void handle_sys(void);
extern asmlinkage void handle_bp(void);
extern asmlinkage void handle_ri(void);
-extern asmlinkage void handle_ri_rdhwr_vivt(void);
+extern asmlinkage void handle_ri_rdhwr_tlbp(void);
extern asmlinkage void handle_ri_rdhwr(void);
extern asmlinkage void handle_cpu(void);
extern asmlinkage void handle_ov(void);
@@ -2407,9 +2407,18 @@ void __init trap_init(void)
set_except_vector(EXCCODE_SYS, handle_sys);
set_except_vector(EXCCODE_BP, handle_bp);
- set_except_vector(EXCCODE_RI, rdhwr_noopt ? handle_ri :
- (cpu_has_vtag_icache ?
- handle_ri_rdhwr_vivt : handle_ri_rdhwr));
+
+ if (rdhwr_noopt)
+ set_except_vector(EXCCODE_RI, handle_ri);
+ else {
+ if (cpu_has_vtag_icache)
+ set_except_vector(EXCCODE_RI, handle_ri_rdhwr_tlbp);
+ else if (current_cpu_type() == CPU_LOONGSON3)
+ set_except_vector(EXCCODE_RI, handle_ri_rdhwr_tlbp);
+ else
+ set_except_vector(EXCCODE_RI, handle_ri_rdhwr);
+ }
+
set_except_vector(EXCCODE_CPU, handle_cpu);
set_except_vector(EXCCODE_OV, handle_ov);
set_except_vector(EXCCODE_TR, handle_tr);
--
2.7.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH RESEND 3/4] MIPS: Flush wrong invalid FTLB entry for huge page
2017-01-21 0:56 [PATCH RESEND 1/4] MIPS: Add MIPS_CPU_FTLB for Loongson-3A R2 Huacai Chen
2017-01-21 0:56 ` [PATCH RESEND 2/4] MIPS: Check TLB before handle_ri_rdhwr() for Loongson-3 Huacai Chen
@ 2017-01-21 0:56 ` Huacai Chen
2017-01-21 0:56 ` [PATCH RESEND 4/4] MIPS: Ensure pmd_present() returns false after pmd_mknotpresent() Huacai Chen
2 siblings, 0 replies; 4+ messages in thread
From: Huacai Chen @ 2017-01-21 0:56 UTC (permalink / raw)
To: Ralf Baechle
Cc: John Crispin, Steven J . Hill, linux-mips, Fuxin Zhang,
Zhangjin Wu, Huacai Chen, stable, Rui Wang
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 3203 bytes --]
On VTLB+FTLB platforms (such as Loongson-3A R2), FTLB's pagesize is
usually configured the same as PAGE_SIZE. In such a case, Huge page
entry is not suitable to write in FTLB.
Unfortunately, when a huge page is created, its page table entries
haven't created immediately. Then the TLB refill handler will fetch an
invalid page table entry which has no "HUGE" bit, and this entry may be
written to FTLB. Since it is invalid, TLB load/store handler will then
use tlbwi to write the valid entry at the same place. However, the
valid entry is a huge page entry which isn't suitable for FTLB.
Our solution is to modify build_huge_handler_tail. Flush the invalid
old entry (whether it is in FTLB or VTLB, this is in order to reduce
branches) and use tlbwr to write the valid new entry.
Cc: stable@vger.kernel.org
Signed-off-by: Rui Wang <wangr@lemote.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
---
arch/mips/mm/tlbex.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 87eed65..aabc413 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -762,7 +762,8 @@ static void build_huge_update_entries(u32 **p, unsigned int pte,
static void build_huge_handler_tail(u32 **p, struct uasm_reloc **r,
struct uasm_label **l,
unsigned int pte,
- unsigned int ptr)
+ unsigned int ptr,
+ unsigned int flush)
{
#ifdef CONFIG_SMP
UASM_i_SC(p, pte, 0, ptr);
@@ -771,6 +772,22 @@ static void build_huge_handler_tail(u32 **p, struct uasm_reloc **r,
#else
UASM_i_SW(p, pte, 0, ptr);
#endif
+ if (cpu_has_ftlb && flush) {
+ BUG_ON(!cpu_has_tlbinv);
+
+ UASM_i_MFC0(p, ptr, C0_ENTRYHI);
+ uasm_i_ori(p, ptr, ptr, MIPS_ENTRYHI_EHINV);
+ UASM_i_MTC0(p, ptr, C0_ENTRYHI);
+ build_tlb_write_entry(p, l, r, tlb_indexed);
+
+ uasm_i_xori(p, ptr, ptr, MIPS_ENTRYHI_EHINV);
+ UASM_i_MTC0(p, ptr, C0_ENTRYHI);
+ build_huge_update_entries(p, pte, ptr);
+ build_huge_tlb_write_entry(p, l, r, pte, tlb_random, 0);
+
+ return;
+ }
+
build_huge_update_entries(p, pte, ptr);
build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed, 0);
}
@@ -2197,7 +2214,7 @@ static void build_r4000_tlb_load_handler(void)
uasm_l_tlbl_goaround2(&l, p);
}
uasm_i_ori(&p, wr.r1, wr.r1, (_PAGE_ACCESSED | _PAGE_VALID));
- build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
+ build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2, 1);
#endif
uasm_l_nopage_tlbl(&l, p);
@@ -2252,7 +2269,7 @@ static void build_r4000_tlb_store_handler(void)
build_tlb_probe_entry(&p);
uasm_i_ori(&p, wr.r1, wr.r1,
_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
- build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
+ build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2, 1);
#endif
uasm_l_nopage_tlbs(&l, p);
@@ -2308,7 +2325,7 @@ static void build_r4000_tlb_modify_handler(void)
build_tlb_probe_entry(&p);
uasm_i_ori(&p, wr.r1, wr.r1,
_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
- build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
+ build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2, 0);
#endif
uasm_l_nopage_tlbm(&l, p);
--
2.7.0
ÿÿÿÿÿ \x04
^ permalink raw reply related [flat|nested] 4+ messages in thread