From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, James Clarke <jrtc27@jrtc27.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.4 26/37] sparc64: Handle extremely large kernel TLB range flushes more gracefully.
Date: Sat, 19 Nov 2016 10:20:42 +0100 [thread overview]
Message-ID: <20161119092011.322902551@linuxfoundation.org> (raw)
In-Reply-To: <20161119092010.016555184@linuxfoundation.org>
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: "David S. Miller" <davem@davemloft.net>
[ Upstream commit a74ad5e660a9ee1d071665e7e8ad822784a2dc7f ]
When the vmalloc area gets fragmented, and because the firmware
mapping area sits between where modules live and the vmalloc area, we
can sometimes receive requests for enormous kernel TLB range flushes.
When this happens the cpu just spins flushing billions of pages and
this triggers the NMI watchdog and other problems.
We took care of this on the TSB side by doing a linear scan of the
table once we pass a certain threshold.
Do something similar for the TLB flush, however we are limited by
the TLB flush facilities provided by the different chip variants.
First of all we use an (mostly arbitrary) cut-off of 256K which is
about 32 pages. This can be tuned in the future.
The huge range code path for each chip works as follows:
1) On spitfire we flush all non-locked TLB entries using diagnostic
acceses.
2) On cheetah we use the "flush all" TLB flush.
3) On sun4v/hypervisor we do a TLB context flush on context 0, which
unlike previous chips does not remove "permanent" or locked
entries.
We could probably do something better on spitfire, such as limiting
the flush to kernel TLB entries or even doing range comparisons.
However that probably isn't worth it since those chips are old and
the TLB only had 64 entries.
Reported-by: James Clarke <jrtc27@jrtc27.com>
Tested-by: James Clarke <jrtc27@jrtc27.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/sparc/mm/ultra.S | 283 ++++++++++++++++++++++++++++++++++++++++----------
1 file changed, 228 insertions(+), 55 deletions(-)
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -113,12 +113,14 @@ __flush_tlb_pending: /* 27 insns */
.align 32
.globl __flush_tlb_kernel_range
-__flush_tlb_kernel_range: /* 19 insns */
+__flush_tlb_kernel_range: /* 31 insns */
/* %o0=start, %o1=end */
cmp %o0, %o1
be,pn %xcc, 2f
+ sub %o1, %o0, %o3
+ srlx %o3, 18, %o4
+ brnz,pn %o4, __spitfire_flush_tlb_kernel_range_slow
sethi %hi(PAGE_SIZE), %o4
- sub %o1, %o0, %o3
sub %o3, %o4, %o3
or %o0, 0x20, %o0 ! Nucleus
1: stxa %g0, [%o0 + %o3] ASI_DMMU_DEMAP
@@ -134,6 +136,38 @@ __flush_tlb_kernel_range: /* 19 insns */
nop
nop
nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+__spitfire_flush_tlb_kernel_range_slow:
+ mov 63 * 8, %o4
+1: ldxa [%o4] ASI_ITLB_DATA_ACCESS, %o3
+ andcc %o3, 0x40, %g0 /* _PAGE_L_4U */
+ bne,pn %xcc, 2f
+ mov TLB_TAG_ACCESS, %o3
+ stxa %g0, [%o3] ASI_IMMU
+ stxa %g0, [%o4] ASI_ITLB_DATA_ACCESS
+ membar #Sync
+2: ldxa [%o4] ASI_DTLB_DATA_ACCESS, %o3
+ andcc %o3, 0x40, %g0
+ bne,pn %xcc, 2f
+ mov TLB_TAG_ACCESS, %o3
+ stxa %g0, [%o3] ASI_DMMU
+ stxa %g0, [%o4] ASI_DTLB_DATA_ACCESS
+ membar #Sync
+2: sub %o4, 8, %o4
+ brgez,pt %o4, 1b
+ nop
+ retl
+ nop
__spitfire_flush_tlb_mm_slow:
rdpr %pstate, %g1
@@ -288,6 +322,40 @@ __cheetah_flush_tlb_pending: /* 27 insns
retl
wrpr %g7, 0x0, %pstate
+__cheetah_flush_tlb_kernel_range: /* 31 insns */
+ /* %o0=start, %o1=end */
+ cmp %o0, %o1
+ be,pn %xcc, 2f
+ sub %o1, %o0, %o3
+ srlx %o3, 18, %o4
+ brnz,pn %o4, 3f
+ sethi %hi(PAGE_SIZE), %o4
+ sub %o3, %o4, %o3
+ or %o0, 0x20, %o0 ! Nucleus
+1: stxa %g0, [%o0 + %o3] ASI_DMMU_DEMAP
+ stxa %g0, [%o0 + %o3] ASI_IMMU_DEMAP
+ membar #Sync
+ brnz,pt %o3, 1b
+ sub %o3, %o4, %o3
+2: sethi %hi(KERNBASE), %o3
+ flush %o3
+ retl
+ nop
+3: mov 0x80, %o4
+ stxa %g0, [%o4] ASI_DMMU_DEMAP
+ membar #Sync
+ stxa %g0, [%o4] ASI_IMMU_DEMAP
+ membar #Sync
+ retl
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
#ifdef DCACHE_ALIASING_POSSIBLE
__cheetah_flush_dcache_page: /* 11 insns */
sethi %hi(PAGE_OFFSET), %g1
@@ -388,13 +456,15 @@ __hypervisor_flush_tlb_pending: /* 27 in
nop
nop
-__hypervisor_flush_tlb_kernel_range: /* 19 insns */
+__hypervisor_flush_tlb_kernel_range: /* 31 insns */
/* %o0=start, %o1=end */
cmp %o0, %o1
be,pn %xcc, 2f
- sethi %hi(PAGE_SIZE), %g3
- mov %o0, %g1
- sub %o1, %g1, %g2
+ sub %o1, %o0, %g2
+ srlx %g2, 18, %g3
+ brnz,pn %g3, 4f
+ mov %o0, %g1
+ sethi %hi(PAGE_SIZE), %g3
sub %g2, %g3, %g2
1: add %g1, %g2, %o0 /* ARG0: virtual address */
mov 0, %o1 /* ARG1: mmu context */
@@ -409,6 +479,16 @@ __hypervisor_flush_tlb_kernel_range: /*
3: sethi %hi(__hypervisor_tlb_tl0_error), %o2
jmpl %o2 + %lo(__hypervisor_tlb_tl0_error), %g0
nop
+4: mov 0, %o0 /* ARG0: CPU lists unimplemented */
+ mov 0, %o1 /* ARG1: CPU lists unimplemented */
+ mov 0, %o2 /* ARG2: mmu context == nucleus */
+ mov HV_MMU_ALL, %o3 /* ARG3: flags */
+ mov HV_FAST_MMU_DEMAP_CTX, %o5
+ ta HV_FAST_TRAP
+ brnz,pn %o0, 3b
+ mov HV_FAST_MMU_DEMAP_CTX, %o1
+ retl
+ nop
#ifdef DCACHE_ALIASING_POSSIBLE
/* XXX Niagara and friends have an 8K cache, so no aliasing is
@@ -431,43 +511,6 @@ tlb_patch_one:
retl
nop
- .globl cheetah_patch_cachetlbops
-cheetah_patch_cachetlbops:
- save %sp, -128, %sp
-
- sethi %hi(__flush_tlb_mm), %o0
- or %o0, %lo(__flush_tlb_mm), %o0
- sethi %hi(__cheetah_flush_tlb_mm), %o1
- or %o1, %lo(__cheetah_flush_tlb_mm), %o1
- call tlb_patch_one
- mov 19, %o2
-
- sethi %hi(__flush_tlb_page), %o0
- or %o0, %lo(__flush_tlb_page), %o0
- sethi %hi(__cheetah_flush_tlb_page), %o1
- or %o1, %lo(__cheetah_flush_tlb_page), %o1
- call tlb_patch_one
- mov 22, %o2
-
- sethi %hi(__flush_tlb_pending), %o0
- or %o0, %lo(__flush_tlb_pending), %o0
- sethi %hi(__cheetah_flush_tlb_pending), %o1
- or %o1, %lo(__cheetah_flush_tlb_pending), %o1
- call tlb_patch_one
- mov 27, %o2
-
-#ifdef DCACHE_ALIASING_POSSIBLE
- sethi %hi(__flush_dcache_page), %o0
- or %o0, %lo(__flush_dcache_page), %o0
- sethi %hi(__cheetah_flush_dcache_page), %o1
- or %o1, %lo(__cheetah_flush_dcache_page), %o1
- call tlb_patch_one
- mov 11, %o2
-#endif /* DCACHE_ALIASING_POSSIBLE */
-
- ret
- restore
-
#ifdef CONFIG_SMP
/* These are all called by the slaves of a cross call, at
* trap level 1, with interrupts fully disabled.
@@ -535,13 +578,15 @@ xcall_flush_tlb_page: /* 20 insns */
nop
.globl xcall_flush_tlb_kernel_range
-xcall_flush_tlb_kernel_range: /* 28 insns */
+xcall_flush_tlb_kernel_range: /* 44 insns */
sethi %hi(PAGE_SIZE - 1), %g2
or %g2, %lo(PAGE_SIZE - 1), %g2
andn %g1, %g2, %g1
andn %g7, %g2, %g7
sub %g7, %g1, %g3
- add %g2, 1, %g2
+ srlx %g3, 18, %g2
+ brnz,pn %g2, 2f
+ add %g2, 1, %g2
sub %g3, %g2, %g3
or %g1, 0x20, %g1 ! Nucleus
1: stxa %g0, [%g1 + %g3] ASI_DMMU_DEMAP
@@ -550,11 +595,25 @@ xcall_flush_tlb_kernel_range: /* 28 insn
brnz,pt %g3, 1b
sub %g3, %g2, %g3
retry
- nop
- nop
- nop
- nop
- nop
+2: mov 63 * 8, %g1
+1: ldxa [%g1] ASI_ITLB_DATA_ACCESS, %g2
+ andcc %g2, 0x40, %g0 /* _PAGE_L_4U */
+ bne,pn %xcc, 2f
+ mov TLB_TAG_ACCESS, %g2
+ stxa %g0, [%g2] ASI_IMMU
+ stxa %g0, [%g1] ASI_ITLB_DATA_ACCESS
+ membar #Sync
+2: ldxa [%g1] ASI_DTLB_DATA_ACCESS, %g2
+ andcc %g2, 0x40, %g0
+ bne,pn %xcc, 2f
+ mov TLB_TAG_ACCESS, %g2
+ stxa %g0, [%g2] ASI_DMMU
+ stxa %g0, [%g1] ASI_DTLB_DATA_ACCESS
+ membar #Sync
+2: sub %g1, 8, %g1
+ brgez,pt %g1, 1b
+ nop
+ retry
nop
nop
nop
@@ -683,6 +742,52 @@ xcall_fetch_glob_pmu_n4:
retry
+__cheetah_xcall_flush_tlb_kernel_range: /* 44 insns */
+ sethi %hi(PAGE_SIZE - 1), %g2
+ or %g2, %lo(PAGE_SIZE - 1), %g2
+ andn %g1, %g2, %g1
+ andn %g7, %g2, %g7
+ sub %g7, %g1, %g3
+ srlx %g3, 18, %g2
+ brnz,pn %g2, 2f
+ add %g2, 1, %g2
+ sub %g3, %g2, %g3
+ or %g1, 0x20, %g1 ! Nucleus
+1: stxa %g0, [%g1 + %g3] ASI_DMMU_DEMAP
+ stxa %g0, [%g1 + %g3] ASI_IMMU_DEMAP
+ membar #Sync
+ brnz,pt %g3, 1b
+ sub %g3, %g2, %g3
+ retry
+2: mov 0x80, %g2
+ stxa %g0, [%g2] ASI_DMMU_DEMAP
+ membar #Sync
+ stxa %g0, [%g2] ASI_IMMU_DEMAP
+ membar #Sync
+ retry
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
#ifdef DCACHE_ALIASING_POSSIBLE
.align 32
.globl xcall_flush_dcache_page_cheetah
@@ -798,18 +903,20 @@ __hypervisor_xcall_flush_tlb_page: /* 20
nop
.globl __hypervisor_xcall_flush_tlb_kernel_range
-__hypervisor_xcall_flush_tlb_kernel_range: /* 28 insns */
+__hypervisor_xcall_flush_tlb_kernel_range: /* 44 insns */
/* %g1=start, %g7=end, g2,g3,g4,g5,g6=scratch */
sethi %hi(PAGE_SIZE - 1), %g2
or %g2, %lo(PAGE_SIZE - 1), %g2
andn %g1, %g2, %g1
andn %g7, %g2, %g7
sub %g7, %g1, %g3
+ srlx %g3, 18, %g7
add %g2, 1, %g2
sub %g3, %g2, %g3
mov %o0, %g2
mov %o1, %g4
- mov %o2, %g7
+ brnz,pn %g7, 2f
+ mov %o2, %g7
1: add %g1, %g3, %o0 /* ARG0: virtual address */
mov 0, %o1 /* ARG1: mmu context */
mov HV_MMU_ALL, %o2 /* ARG2: flags */
@@ -820,7 +927,7 @@ __hypervisor_xcall_flush_tlb_kernel_rang
sethi %hi(PAGE_SIZE), %o2
brnz,pt %g3, 1b
sub %g3, %o2, %g3
- mov %g2, %o0
+5: mov %g2, %o0
mov %g4, %o1
mov %g7, %o2
membar #Sync
@@ -828,6 +935,20 @@ __hypervisor_xcall_flush_tlb_kernel_rang
1: sethi %hi(__hypervisor_tlb_xcall_error), %g4
jmpl %g4 + %lo(__hypervisor_tlb_xcall_error), %g0
nop
+2: mov %o3, %g1
+ mov %o5, %g3
+ mov 0, %o0 /* ARG0: CPU lists unimplemented */
+ mov 0, %o1 /* ARG1: CPU lists unimplemented */
+ mov 0, %o2 /* ARG2: mmu context == nucleus */
+ mov HV_MMU_ALL, %o3 /* ARG3: flags */
+ mov HV_FAST_MMU_DEMAP_CTX, %o5
+ ta HV_FAST_TRAP
+ mov %g1, %o3
+ brz,pt %o0, 5b
+ mov %g3, %o5
+ mov HV_FAST_MMU_DEMAP_CTX, %g6
+ ba,pt %xcc, 1b
+ clr %g5
/* These just get rescheduled to PIL vectors. */
.globl xcall_call_function
@@ -864,6 +985,58 @@ xcall_kgdb_capture:
#endif /* CONFIG_SMP */
+ .globl cheetah_patch_cachetlbops
+cheetah_patch_cachetlbops:
+ save %sp, -128, %sp
+
+ sethi %hi(__flush_tlb_mm), %o0
+ or %o0, %lo(__flush_tlb_mm), %o0
+ sethi %hi(__cheetah_flush_tlb_mm), %o1
+ or %o1, %lo(__cheetah_flush_tlb_mm), %o1
+ call tlb_patch_one
+ mov 19, %o2
+
+ sethi %hi(__flush_tlb_page), %o0
+ or %o0, %lo(__flush_tlb_page), %o0
+ sethi %hi(__cheetah_flush_tlb_page), %o1
+ or %o1, %lo(__cheetah_flush_tlb_page), %o1
+ call tlb_patch_one
+ mov 22, %o2
+
+ sethi %hi(__flush_tlb_pending), %o0
+ or %o0, %lo(__flush_tlb_pending), %o0
+ sethi %hi(__cheetah_flush_tlb_pending), %o1
+ or %o1, %lo(__cheetah_flush_tlb_pending), %o1
+ call tlb_patch_one
+ mov 27, %o2
+
+ sethi %hi(__flush_tlb_kernel_range), %o0
+ or %o0, %lo(__flush_tlb_kernel_range), %o0
+ sethi %hi(__cheetah_flush_tlb_kernel_range), %o1
+ or %o1, %lo(__cheetah_flush_tlb_kernel_range), %o1
+ call tlb_patch_one
+ mov 31, %o2
+
+#ifdef DCACHE_ALIASING_POSSIBLE
+ sethi %hi(__flush_dcache_page), %o0
+ or %o0, %lo(__flush_dcache_page), %o0
+ sethi %hi(__cheetah_flush_dcache_page), %o1
+ or %o1, %lo(__cheetah_flush_dcache_page), %o1
+ call tlb_patch_one
+ mov 11, %o2
+#endif /* DCACHE_ALIASING_POSSIBLE */
+
+#ifdef CONFIG_SMP
+ sethi %hi(xcall_flush_tlb_kernel_range), %o0
+ or %o0, %lo(xcall_flush_tlb_kernel_range), %o0
+ sethi %hi(__cheetah_xcall_flush_tlb_kernel_range), %o1
+ or %o1, %lo(__cheetah_xcall_flush_tlb_kernel_range), %o1
+ call tlb_patch_one
+ mov 44, %o2
+#endif /* CONFIG_SMP */
+
+ ret
+ restore
.globl hypervisor_patch_cachetlbops
hypervisor_patch_cachetlbops:
@@ -895,7 +1068,7 @@ hypervisor_patch_cachetlbops:
sethi %hi(__hypervisor_flush_tlb_kernel_range), %o1
or %o1, %lo(__hypervisor_flush_tlb_kernel_range), %o1
call tlb_patch_one
- mov 19, %o2
+ mov 31, %o2
#ifdef DCACHE_ALIASING_POSSIBLE
sethi %hi(__flush_dcache_page), %o0
@@ -926,7 +1099,7 @@ hypervisor_patch_cachetlbops:
sethi %hi(__hypervisor_xcall_flush_tlb_kernel_range), %o1
or %o1, %lo(__hypervisor_xcall_flush_tlb_kernel_range), %o1
call tlb_patch_one
- mov 28, %o2
+ mov 44, %o2
#endif /* CONFIG_SMP */
ret
next prev parent reply other threads:[~2016-11-19 9:22 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161119092048epcas3p1db29198af4c10269f85a6b2169f469d8@epcas3p1.samsung.com>
2016-11-19 9:20 ` [PATCH 4.4 00/37] 4.4.34-stable review Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 01/37] dctcp: avoid bogus doubling of cwnd after loss Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 02/37] net: clear sk_err_soft in sk_clone_lock() Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 04/37] bgmac: stop clearing DMA receive control register right after it is set Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 05/37] ip6_tunnel: Clear IP6CB in ip6tunnel_xmit() Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 07/37] dccp: do not send reset to already closed sockets Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 08/37] dccp: fix out of bound access in dccp_v4_err() Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 09/37] ipv6: dccp: fix out of bound access in dccp_v6_err() Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 10/37] ipv6: dccp: add missing bind_conflict to dccp_ipv6_mapped Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 11/37] sctp: assign assoc_id earlier in __sctp_connect Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 12/37] fib_trie: Correct /proc/net/route off by one error Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 14/37] net: __skb_flow_dissect() must cap its return value Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 15/37] ipv4: use new_gw for redirect neigh lookup Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 16/37] tcp: take care of truncations done by sk_filter() Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 17/37] tty: Prevent ldisc drivers from re-using stale tty fields Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 18/37] sparc: Dont leak context bits into thread->fault_address Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 19/37] sparc: serial: sunhv: fix a double lock bug Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 20/37] sparc64 mm: Fix base TSB sizing when hugetlb pages are used Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 21/37] sparc: Handle negative offsets in arch_jump_label_transform Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 22/37] sparc64: Handle extremely large kernel TSB range flushes sanely Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 23/37] sparc64: Fix illegal relative branches in hypervisor patched TLB code Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 24/37] sparc64: Fix instruction count in comment for __hypervisor_flush_tlb_pending Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 25/37] sparc64: Fix illegal relative branches in hypervisor patched TLB cross-call code Greg Kroah-Hartman
2016-11-19 9:20 ` Greg Kroah-Hartman [this message]
2016-11-19 9:20 ` [PATCH 4.4 27/37] sparc64: Delete __ret_efault Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 28/37] sparc64: Prepare to move to more saner user copy exception handling Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 29/37] sparc64: Convert copy_in_user to accurate exception reporting Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 30/37] sparc64: Convert GENcopy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 31/37] sparc64: Convert U1copy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 32/37] sparc64: Convert NG4copy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 33/37] sparc64: Convert NGcopy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 34/37] sparc64: Convert NG2copy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 35/37] sparc64: Convert U3copy_{from,to}_user " Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 36/37] sparc64: Delete now unused user copy assembler helpers Greg Kroah-Hartman
2016-11-19 9:20 ` [PATCH 4.4 37/37] sparc64: Delete now unused user copy fixup functions Greg Kroah-Hartman
2016-11-19 16:20 ` [PATCH 4.4 00/37] 4.4.34-stable review Guenter Roeck
2016-11-21 16:32 ` Shuah Khan
2016-11-21 16:49 ` Greg Kroah-Hartman
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for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).