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ARC fixes for 4.4-rc1

Browse Source 
- A bunch of brown paper bag bugs (MAINTAINERS list email, SMP build failure)
 - cpu_relax() now compiler barrier for UP as well
 - Handling of userspace Bus Errors for ARCompact builds
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Merge tag 'arc-4.4-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC fixes from Vineet Gupta:
 "Found a couple of brown paper bag bugs with the prev pull request
  (including a SMP build breakage report from Guenter).  Since these are
  urgent I also decided to send over a bunch of other pending fixes
  which could have otherwise waited an rc or two.

  Summary:

   - A bunch of brown paper bag bugs (MAINTAINERS list email, SMP build
     failure)
   - cpu_relax() now compiler barrier for UP as well
   - handling of userspace Bus Errors for ARCompact builds"

* tag 'arc-4.4-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: Fix silly typo in MAINTAINERS file
  ARC: cpu_relax() to be compiler barrier even for UP
  ARC: use ASL assembler mnemonic
  ARC: [arcompact] Handle bus error from userspace as Interrupt not exception
  ARC: remove extraneous header include
  ARCv2: lib: memcpy: use local symbols
This commit is contained in:
Linus Torvalds 2015-11-14 09:09:37 -08:00
commit b3a0d9a232
8 changed files with 74 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
View File

@ -10300,7 +10300,7 @@ F: include/net/switchdev.h
SYNOPSYS ARC ARCHITECTURE
M: Vineet Gupta <vgupta@synopsys.com>
L: linux-snps-arc@lists.infraded.org
L: linux-snps-arc@lists.infradead.org
S: Supported
F: arch/arc/
F: Documentation/devicetree/bindings/arc/*

4
arch/arc/include/asm/processor.h
View File

@ -57,11 +57,7 @@ struct task_struct;
* A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
* get optimised away by gcc
*/
#ifdef CONFIG_SMP
#define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
#else
#define cpu_relax() do { } while (0)
#endif
#define cpu_relax_lowlatency() cpu_relax()

19
arch/arc/kernel/entry-arcv2.S
View File

@ -91,6 +91,25 @@ ENTRY(EV_DCError)
flag 1
END(EV_DCError)
; ---------------------------------------------
; Memory Error Exception Handler
; - Unlike ARCompact, handles Bus errors for both User/Kernel mode,
; Instruction fetch or Data access, under a single Exception Vector
; ---------------------------------------------
ENTRY(mem_service)
EXCEPTION_PROLOGUE
lr r0, [efa]
mov r1, sp
FAKE_RET_FROM_EXCPN
bl do_memory_error
b ret_from_exception
END(mem_service)
ENTRY(EV_Misaligned)
EXCEPTION_PROLOGUE

29
arch/arc/kernel/entry-compact.S
View File

@ -142,16 +142,12 @@ int1_saved_reg:
.zero 4
/* Each Interrupt level needs its own scratch */
#ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
ARCFP_DATA int2_saved_reg
.type int2_saved_reg, @object
.size int2_saved_reg, 4
int2_saved_reg:
.zero 4
#endif
; ---------------------------------------------
.section .text, "ax",@progbits
@ -215,6 +211,31 @@ END(handle_interrupt_level2)
#endif
; ---------------------------------------------
; User Mode Memory Bus Error Interrupt Handler
; (Kernel mode memory errors handled via seperate exception vectors)
; ---------------------------------------------
ENTRY(mem_service)
INTERRUPT_PROLOGUE 2
mov r0, ilink2
mov r1, sp
; User process needs to be killed with SIGBUS, but first need to get
; out of the L2 interrupt context (drop to pure kernel mode) and jump
; off to "C" code where SIGBUS in enqueued
lr r3, [status32]
bclr r3, r3, STATUS_A2_BIT
or r3, r3, (STATUS_E1_MASK|STATUS_E2_MASK)
sr r3, [status32_l2]
mov ilink2, 1f
rtie
1:
bl do_memory_error
b ret_from_exception
END(mem_service)
; ---------------------------------------------
; Level 1 ISR
; ---------------------------------------------

17
arch/arc/kernel/entry.S
View File

@ -92,23 +92,6 @@ ENTRY(instr_service)
b ret_from_exception
END(instr_service)
; ---------------------------------------------
; Memory Error Exception Handler
; ---------------------------------------------
ENTRY(mem_service)
EXCEPTION_PROLOGUE
lr r0, [efa]
mov r1, sp
FAKE_RET_FROM_EXCPN
bl do_memory_error
b ret_from_exception
END(mem_service)
; ---------------------------------------------
; Machine Check Exception Handler
; ---------------------------------------------

52
arch/arc/lib/memcpy-archs.S
View File

@ -50,26 +50,26 @@ ENTRY(memcpy)
;;; if size <= 8
cmp r2, 8
bls.d @smallchunk
bls.d @.Lsmallchunk
mov.f lp_count, r2
and.f r4, r0, 0x03
rsub lp_count, r4, 4
lpnz @aligndestination
lpnz @.Laligndestination
;; LOOP BEGIN
ldb.ab r5, [r1,1]
sub r2, r2, 1
stb.ab r5, [r3,1]
aligndestination:
.Laligndestination:
;;; Check the alignment of the source
and.f r4, r1, 0x03
bnz.d @sourceunaligned
bnz.d @.Lsourceunaligned
;;; CASE 0: Both source and destination are 32bit aligned
;;; Convert len to Dwords, unfold x4
lsr.f lp_count, r2, ZOLSHFT
lpnz @copy32_64bytes
lpnz @.Lcopy32_64bytes
;; LOOP START
LOADX (r6, r1)
PREFETCH_READ (r1)
@ -81,25 +81,25 @@ aligndestination:
STOREX (r8, r3)
STOREX (r10, r3)
STOREX (r4, r3)
copy32_64bytes:
.Lcopy32_64bytes:
and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes
smallchunk:
lpnz @copyremainingbytes
.Lsmallchunk:
lpnz @.Lcopyremainingbytes
;; LOOP START
ldb.ab r5, [r1,1]
stb.ab r5, [r3,1]
copyremainingbytes:
.Lcopyremainingbytes:
j [blink]
;;; END CASE 0
sourceunaligned:
.Lsourceunaligned:
cmp r4, 2
beq.d @unalignedOffby2
beq.d @.LunalignedOffby2
sub r2, r2, 1
bhi.d @unalignedOffby3
bhi.d @.LunalignedOffby3
ldb.ab r5, [r1, 1]
;;; CASE 1: The source is unaligned, off by 1
@ -114,7 +114,7 @@ sourceunaligned:
or r5, r5, r6
;; Both src and dst are aligned
lpnz @copy8bytes_1
lpnz @.Lcopy8bytes_1
;; LOOP START
ld.ab r6, [r1, 4]
prefetch [r1, 28] ;Prefetch the next read location
@ -131,7 +131,7 @@ sourceunaligned:
st.ab r7, [r3, 4]
st.ab r9, [r3, 4]
copy8bytes_1:
.Lcopy8bytes_1:
;; Write back the remaining 16bits
EXTRACT_1 (r6, r5, 16)
@ -141,14 +141,14 @@ copy8bytes_1:
stb.ab r5, [r3, 1]
and.f lp_count, r2, 0x07 ;Last 8bytes
lpnz @copybytewise_1
lpnz @.Lcopybytewise_1
;; LOOP START
ldb.ab r6, [r1,1]
stb.ab r6, [r3,1]
copybytewise_1:
.Lcopybytewise_1:
j [blink]
unalignedOffby2:
.LunalignedOffby2:
;;; CASE 2: The source is unaligned, off by 2
ldh.ab r5, [r1, 2]
sub r2, r2, 1
@ -159,7 +159,7 @@ unalignedOffby2:
#ifdef __BIG_ENDIAN__
asl.nz r5, r5, 16
#endif
lpnz @copy8bytes_2
lpnz @.Lcopy8bytes_2
;; LOOP START
ld.ab r6, [r1, 4]
prefetch [r1, 28] ;Prefetch the next read location
@ -176,7 +176,7 @@ unalignedOffby2:
st.ab r7, [r3, 4]
st.ab r9, [r3, 4]
copy8bytes_2:
.Lcopy8bytes_2:
#ifdef __BIG_ENDIAN__
lsr.nz r5, r5, 16
@ -184,14 +184,14 @@ copy8bytes_2:
sth.ab r5, [r3, 2]
and.f lp_count, r2, 0x07 ;Last 8bytes
lpnz @copybytewise_2
lpnz @.Lcopybytewise_2
;; LOOP START
ldb.ab r6, [r1,1]
stb.ab r6, [r3,1]
copybytewise_2:
.Lcopybytewise_2:
j [blink]
unalignedOffby3:
.LunalignedOffby3:
;;; CASE 3: The source is unaligned, off by 3
;;; Hence, I need to read 1byte for achieve the 32bit alignment
@ -201,7 +201,7 @@ unalignedOffby3:
#ifdef __BIG_ENDIAN__
asl.ne r5, r5, 24
#endif
lpnz @copy8bytes_3
lpnz @.Lcopy8bytes_3
;; LOOP START
ld.ab r6, [r1, 4]
prefetch [r1, 28] ;Prefetch the next read location
@ -218,7 +218,7 @@ unalignedOffby3:
st.ab r7, [r3, 4]
st.ab r9, [r3, 4]
copy8bytes_3:
.Lcopy8bytes_3:
#ifdef __BIG_ENDIAN__
lsr.nz r5, r5, 24
@ -226,11 +226,11 @@ copy8bytes_3:
stb.ab r5, [r3, 1]
and.f lp_count, r2, 0x07 ;Last 8bytes
lpnz @copybytewise_3
lpnz @.Lcopybytewise_3
;; LOOP START
ldb.ab r6, [r1,1]
stb.ab r6, [r3,1]
copybytewise_3:
.Lcopybytewise_3:
j [blink]
END(memcpy)

6
arch/arc/mm/tlbex.S
View File

@ -88,7 +88,7 @@ ex_saved_reg1:
#ifdef CONFIG_SMP
sr r0, [ARC_REG_SCRATCH_DATA0] ; freeup r0 to code with
GET_CPU_ID r0 ; get to per cpu scratch mem,
lsl r0, r0, L1_CACHE_SHIFT ; cache line wide per cpu
asl r0, r0, L1_CACHE_SHIFT ; cache line wide per cpu
add r0, @ex_saved_reg1, r0
#else
st r0, [@ex_saved_reg1]
@ -107,7 +107,7 @@ ex_saved_reg1:
.macro TLBMISS_RESTORE_REGS
#ifdef CONFIG_SMP
GET_CPU_ID r0 ; get to per cpu scratch mem
lsl r0, r0, L1_CACHE_SHIFT ; each is cache line wide
asl r0, r0, L1_CACHE_SHIFT ; each is cache line wide
add r0, @ex_saved_reg1, r0
ld_s r3, [r0,12]
ld_s r2, [r0, 8]
@ -256,7 +256,7 @@ ex_saved_reg1:
.macro CONV_PTE_TO_TLB
and r3, r0, PTE_BITS_RWX ; r w x
lsl r2, r3, 3 ; Kr Kw Kx 0 0 0 (GLOBAL, kernel only)
asl r2, r3, 3 ; Kr Kw Kx 0 0 0 (GLOBAL, kernel only)
and.f 0, r0, _PAGE_GLOBAL
or.z r2, r2, r3 ; Kr Kw Kx Ur Uw Ux (!GLOBAL, user page)

1
arch/arc/plat-sim/platform.c
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@ -10,7 +10,6 @@
#include <linux/init.h>
#include <asm/mach_desc.h>
#include <asm/mcip.h>
/*----------------------- Machine Descriptions ------------------------------
*