* [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian
@ 2013-12-17 22:29 Anton Blanchard
2013-12-18 10:15 ` Anton Blanchard
0 siblings, 1 reply; 5+ messages in thread
From: Anton Blanchard @ 2013-12-17 22:29 UTC (permalink / raw)
To: benh, paulus, paulmck; +Cc: linuxppc-dev
From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
The powerpc 64-bit __copy_tofrom_user() function uses shifts to handle
unaligned invocations. However, these shifts were designed for
big-endian systems: On little-endian systems, they must shift in the
opposite direction.
This commit relies on the C preprocessor to insert the correct shifts
into the assembly code.
[ This is a rare but nasty LE issue. Most of the time we use the POWER7
optimised __copy_tofrom_user_power7 loop, but when it hits an exception
we fall back to the base __copy_tofrom_user loop. - Anton ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
---
diff --git a/arch/powerpc/lib/copyuser_64.S b/arch/powerpc/lib/copyuser_64.S
index d73a590..596a285 100644
--- a/arch/powerpc/lib/copyuser_64.S
+++ b/arch/powerpc/lib/copyuser_64.S
@@ -9,6 +9,14 @@
#include <asm/processor.h>
#include <asm/ppc_asm.h>
+#ifdef __BIG_ENDIAN__
+#define sLd sld /* Shift towards low-numbered address. */
+#define sHd srd /* Shift towards high-numbered address. */
+#else
+#define sLd srd /* Shift towards low-numbered address. */
+#define sHd sld /* Shift towards high-numbered address. */
+#endif
+
.align 7
_GLOBAL(__copy_tofrom_user)
BEGIN_FTR_SECTION
@@ -118,10 +126,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
24: ld r9,0(r4) /* 3+2n loads, 2+2n stores */
25: ld r0,8(r4)
- sld r6,r9,r10
+ sLd r6,r9,r10
26: ldu r9,16(r4)
- srd r7,r0,r11
- sld r8,r0,r10
+ sHd r7,r0,r11
+ sLd r8,r0,r10
or r7,r7,r6
blt cr6,79f
27: ld r0,8(r4)
@@ -129,35 +137,35 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
28: ld r0,0(r4) /* 4+2n loads, 3+2n stores */
29: ldu r9,8(r4)
- sld r8,r0,r10
+ sLd r8,r0,r10
addi r3,r3,-8
blt cr6,5f
30: ld r0,8(r4)
- srd r12,r9,r11
- sld r6,r9,r10
+ sHd r12,r9,r11
+ sLd r6,r9,r10
31: ldu r9,16(r4)
or r12,r8,r12
- srd r7,r0,r11
- sld r8,r0,r10
+ sHd r7,r0,r11
+ sLd r8,r0,r10
addi r3,r3,16
beq cr6,78f
1: or r7,r7,r6
32: ld r0,8(r4)
76: std r12,8(r3)
-2: srd r12,r9,r11
- sld r6,r9,r10
+2: sHd r12,r9,r11
+ sLd r6,r9,r10
33: ldu r9,16(r4)
or r12,r8,r12
77: stdu r7,16(r3)
- srd r7,r0,r11
- sld r8,r0,r10
+ sHd r7,r0,r11
+ sLd r8,r0,r10
bdnz 1b
78: std r12,8(r3)
or r7,r7,r6
79: std r7,16(r3)
-5: srd r12,r9,r11
+5: sHd r12,r9,r11
or r12,r8,r12
80: std r12,24(r3)
bne 6f
@@ -165,23 +173,38 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
blr
6: cmpwi cr1,r5,8
addi r3,r3,32
- sld r9,r9,r10
+ sLd r9,r9,r10
ble cr1,7f
34: ld r0,8(r4)
- srd r7,r0,r11
+ sHd r7,r0,r11
or r9,r7,r9
7:
bf cr7*4+1,1f
+#ifdef __BIG_ENDIAN__
rotldi r9,r9,32
+#endif
94: stw r9,0(r3)
+#ifdef __LITTLE_ENDIAN__
+ rotrdi r9,r9,32
+#endif
addi r3,r3,4
1: bf cr7*4+2,2f
+#ifdef __BIG_ENDIAN__
rotldi r9,r9,16
+#endif
95: sth r9,0(r3)
+#ifdef __LITTLE_ENDIAN__
+ rotrdi r9,r9,16
+#endif
addi r3,r3,2
2: bf cr7*4+3,3f
+#ifdef __BIG_ENDIAN__
rotldi r9,r9,8
+#endif
96: stb r9,0(r3)
+#ifdef __LITTLE_ENDIAN__
+ rotrdi r9,r9,8
+#endif
3: li r3,0
blr
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian
2013-12-17 22:29 [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian Anton Blanchard
@ 2013-12-18 10:15 ` Anton Blanchard
2013-12-19 13:17 ` Michael Ellerman
0 siblings, 1 reply; 5+ messages in thread
From: Anton Blanchard @ 2013-12-18 10:15 UTC (permalink / raw)
To: benh, paulus, paulmck; +Cc: linuxppc-dev
Hi,
> [ This is a rare but nasty LE issue. Most of the time we use the
> POWER7 optimised __copy_tofrom_user_power7 loop, but when it hits an
> exception we fall back to the base __copy_tofrom_user loop. - Anton ]
To try and catch any screw ups in our ppc64 memcpy and copy_tofrom_user
loops, I wrote a quick test:
http://ozlabs.org/~anton/junkcode/validate_kernel_copyloops.tar.gz
"make check" runs through all source and destination alignments for a
range of sizes. It verifies the data was copied correctly and the
redzone before and after were untouched.
It tests:
copyuser_64
copyuser_power7
memcpy_64
memcpy_power7
memcpy_64 is currently unused on LE, but I added Paul McKenney's LE
fixes regardless. copyuser_64 has the same LE fix (posted yesterday).
All loops pass the test on both LE and BE.
Anton
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian
2013-12-18 10:15 ` Anton Blanchard
@ 2013-12-19 13:17 ` Michael Ellerman
2013-12-24 1:02 ` Anton Blanchard
0 siblings, 1 reply; 5+ messages in thread
From: Michael Ellerman @ 2013-12-19 13:17 UTC (permalink / raw)
To: Anton Blanchard; +Cc: paulmck, paulus, linuxppc-dev
On Wed, 2013-12-18 at 21:15 +1100, Anton Blanchard wrote:
> Hi,
>
> > [ This is a rare but nasty LE issue. Most of the time we use the
> > POWER7 optimised __copy_tofrom_user_power7 loop, but when it hits an
> > exception we fall back to the base __copy_tofrom_user loop. - Anton ]
>
> To try and catch any screw ups in our ppc64 memcpy and copy_tofrom_user
> loops, I wrote a quick test:
>
> http://ozlabs.org/~anton/junkcode/validate_kernel_copyloops.tar.gz
Nice! How's this look?
cheers
selftests: Import Anton's memcpy / copy_tofrom_user tests
Turn Anton's memcpy / copy_tofrom_user test into something that can
live in tools/testing/selftests.
It requires one turd in arch/powerpc/lib/memcpy_64.S, but it's pretty
harmless IMHO.
We are sailing very close to the wind with the feature macros. We define
them to nothing, which currently means we get a few extra nops and
include the unaligned calls.
---
arch/powerpc/lib/memcpy_64.S | 2 +
tools/testing/selftests/powerpc/Makefile | 2 +-
tools/testing/selftests/powerpc/copyloops/Makefile | 29 +++++++
.../selftests/powerpc/copyloops/asm/ppc_asm.h | 86 +++++++++++++++++++
.../selftests/powerpc/copyloops/asm/processor.h | 0
.../selftests/powerpc/copyloops/copyuser_64.S | 1 +
.../selftests/powerpc/copyloops/copyuser_power7.S | 1 +
.../selftests/powerpc/copyloops/memcpy_64.S | 1 +
.../selftests/powerpc/copyloops/memcpy_power7.S | 1 +
.../testing/selftests/powerpc/copyloops/validate.c | 99 ++++++++++++++++++++++
tools/testing/selftests/powerpc/utils.h | 3 +
11 files changed, 224 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/copyloops/Makefile
create mode 100644 tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h
create mode 100644 tools/testing/selftests/powerpc/copyloops/asm/processor.h
create mode 120000 tools/testing/selftests/powerpc/copyloops/copyuser_64.S
create mode 120000 tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
create mode 120000 tools/testing/selftests/powerpc/copyloops/memcpy_64.S
create mode 120000 tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
create mode 100644 tools/testing/selftests/powerpc/copyloops/validate.c
diff --git a/arch/powerpc/lib/memcpy_64.S b/arch/powerpc/lib/memcpy_64.S
index d2bbbc8..72ad055 100644
--- a/arch/powerpc/lib/memcpy_64.S
+++ b/arch/powerpc/lib/memcpy_64.S
@@ -14,7 +14,9 @@ _GLOBAL(memcpy)
BEGIN_FTR_SECTION
std r3,48(r1) /* save destination pointer for return value */
FTR_SECTION_ELSE
+#ifndef SELFTEST
b memcpy_power7
+#endif
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
PPC_MTOCRF(0x01,r5)
cmpldi cr1,r5,16
diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index bd24ae5..316194f 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR
export CC CFLAGS
-TARGETS = pmu
+TARGETS = pmu copyloops
endif
diff --git a/tools/testing/selftests/powerpc/copyloops/Makefile b/tools/testing/selftests/powerpc/copyloops/Makefile
new file mode 100644
index 0000000..6f2d3be
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/Makefile
@@ -0,0 +1,29 @@
+# The loops are all 64-bit code
+CFLAGS += -m64
+CFLAGS += -I$(CURDIR)
+CFLAGS += -D SELFTEST
+
+# Use our CFLAGS for the implicit .S rule
+ASFLAGS = $(CFLAGS)
+
+PROGS := copyuser_64 copyuser_power7 memcpy_64 memcpy_power7
+EXTRA_SOURCES := validate.c ../harness.c
+
+all: $(PROGS)
+
+copyuser_64: CPPFLAGS += -D COPY_LOOP=test___copy_tofrom_user_base
+copyuser_power7: CPPFLAGS += -D COPY_LOOP=test___copy_tofrom_user_power7
+memcpy_64: CPPFLAGS += -D COPY_LOOP=test_memcpy
+memcpy_power7: CPPFLAGS += -D COPY_LOOP=test_memcpy_power7
+
+$(PROGS): $(EXTRA_SOURCES)
+
+run_tests: all
+ @-for PROG in $(PROGS); do \
+ ./$$PROG; \
+ done;
+
+clean:
+ rm -f $(PROGS) *.o
+
+.PHONY: all run_tests clean
diff --git a/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h b/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h
new file mode 100644
index 0000000..ccd9c84
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h
@@ -0,0 +1,86 @@
+#include <ppc-asm.h>
+
+#define CONFIG_ALTIVEC
+
+#define r1 1
+
+#define vr0 0
+#define vr1 1
+#define vr2 2
+#define vr3 3
+#define vr4 4
+#define vr5 5
+#define vr6 6
+#define vr7 7
+#define vr8 8
+#define vr9 9
+#define vr10 10
+#define vr11 11
+#define vr12 12
+#define vr13 13
+#define vr14 14
+#define vr15 15
+#define vr16 16
+#define vr17 17
+#define vr18 18
+#define vr19 19
+#define vr20 20
+#define vr21 21
+#define vr22 22
+#define vr23 23
+#define vr24 24
+#define vr25 25
+#define vr26 26
+#define vr27 27
+#define vr28 28
+#define vr29 29
+#define vr30 30
+#define vr31 31
+
+#define R14 r14
+#define R15 r15
+#define R16 r16
+#define R17 r17
+#define R18 r18
+#define R19 r19
+#define R20 r20
+#define R21 r21
+#define R22 r22
+
+#define STACKFRAMESIZE 256
+#define STK_PARAM(i) (48 + ((i)-3)*8)
+#define STK_REG(i) (112 + ((i)-14)*8)
+
+#define _GLOBAL(A) FUNC_START(test_ ## A)
+
+#define PPC_MTOCRF(A, B) mtocrf A, B
+
+FUNC_START(enter_vmx_usercopy)
+ li r3,1
+ blr
+
+FUNC_START(exit_vmx_usercopy)
+ li r3,0
+ blr
+
+FUNC_START(enter_vmx_copy)
+ li r3,1
+ blr
+
+FUNC_START(exit_vmx_copy)
+ blr
+
+FUNC_START(memcpy_power7)
+ blr
+
+FUNC_START(__copy_tofrom_user_power7)
+ blr
+
+FUNC_START(__copy_tofrom_user_base)
+ blr
+
+#define BEGIN_FTR_SECTION
+#define FTR_SECTION_ELSE
+#define ALT_FTR_SECTION_END_IFCLR(x)
+#define ALT_FTR_SECTION_END(x, y)
+#define END_FTR_SECTION_IFCLR(x)
diff --git a/tools/testing/selftests/powerpc/copyloops/asm/processor.h b/tools/testing/selftests/powerpc/copyloops/asm/processor.h
new file mode 100644
index 0000000..e69de29
diff --git a/tools/testing/selftests/powerpc/copyloops/copyuser_64.S b/tools/testing/selftests/powerpc/copyloops/copyuser_64.S
new file mode 120000
index 0000000..f1c418a
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/copyuser_64.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/copyuser_64.S
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S b/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
new file mode 120000
index 0000000..4786895
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/copyuser_power7.S
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/copyloops/memcpy_64.S b/tools/testing/selftests/powerpc/copyloops/memcpy_64.S
new file mode 120000
index 0000000..cce33fb
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/memcpy_64.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/memcpy_64.S
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S b/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
new file mode 120000
index 0000000..0d6fbfa
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/memcpy_power7.S
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/copyloops/validate.c b/tools/testing/selftests/powerpc/copyloops/validate.c
new file mode 100644
index 0000000..1750ff5
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/validate.c
@@ -0,0 +1,99 @@
+#include <malloc.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include "../utils.h"
+
+#define MAX_LEN 8192
+#define MAX_OFFSET 16
+#define MIN_REDZONE 128
+#define BUFLEN (MAX_LEN+MAX_OFFSET+2*MIN_REDZONE)
+#define POISON 0xa5
+
+unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
+
+static void do_one(char *src, char *dst, unsigned long src_off,
+ unsigned long dst_off, unsigned long len, void *redzone,
+ void *fill)
+{
+ char *srcp, *dstp;
+ unsigned long ret;
+ unsigned long i;
+
+ srcp = src + MIN_REDZONE + src_off;
+ dstp = dst + MIN_REDZONE + dst_off;
+
+ memset(src, POISON, BUFLEN);
+ memset(dst, POISON, BUFLEN);
+ memcpy(srcp, fill, len);
+
+ ret = COPY_LOOP(dstp, srcp, len);
+ if (ret && ret != (unsigned long)dstp) {
+ printf("(%p,%p,%ld) returned %ld\n", dstp, srcp, len, ret);
+ abort();
+ }
+
+ if (memcmp(dstp, srcp, len)) {
+ printf("(%p,%p,%ld) miscompare\n", dstp, srcp, len);
+ printf("src: ");
+ for (i = 0; i < len; i++)
+ printf("%02x ", srcp[i]);
+ printf("\ndst: ");
+ for (i = 0; i < len; i++)
+ printf("%02x ", dstp[i]);
+ printf("\n");
+ abort();
+ }
+
+ if (memcmp(dst, redzone, dstp - dst)) {
+ printf("(%p,%p,%ld) redzone before corrupted\n",
+ dstp, srcp, len);
+ abort();
+ }
+
+ if (memcmp(dstp+len, redzone, dst+BUFLEN-(dstp+len))) {
+ printf("(%p,%p,%ld) redzone after corrupted\n",
+ dstp, srcp, len);
+ abort();
+ }
+}
+
+int test_copy_loop(void)
+{
+ char *src, *dst, *redzone, *fill;
+ unsigned long len, src_off, dst_off;
+ unsigned long i;
+
+ src = memalign(BUFLEN, BUFLEN);
+ dst = memalign(BUFLEN, BUFLEN);
+ redzone = malloc(BUFLEN);
+ fill = malloc(BUFLEN);
+
+ if (!src || !dst || !redzone || !fill) {
+ fprintf(stderr, "malloc failed\n");
+ exit(1);
+ }
+
+ memset(redzone, POISON, BUFLEN);
+
+ /* Fill with sequential bytes */
+ for (i = 0; i < BUFLEN; i++)
+ fill[i] = i & 0xff;
+
+ for (len = 1; len < MAX_LEN; len++) {
+ for (src_off = 0; src_off < MAX_OFFSET; src_off++) {
+ for (dst_off = 0; dst_off < MAX_OFFSET; dst_off++) {
+ do_one(src, dst, src_off, dst_off, len,
+ redzone, fill);
+ }
+ }
+ }
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(test_copy_loop, str(COPY_LOOP));
+}
diff --git a/tools/testing/selftests/powerpc/utils.h b/tools/testing/selftests/powerpc/utils.h
index 5851c4b..0de0644 100644
--- a/tools/testing/selftests/powerpc/utils.h
+++ b/tools/testing/selftests/powerpc/utils.h
@@ -31,4 +31,7 @@ do { \
} \
} while (0)
+#define _str(s) #s
+#define str(s) _str(s)
+
#endif /* _SELFTESTS_POWERPC_UTILS_H */
--
1.8.3.2
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian
2013-12-19 13:17 ` Michael Ellerman
@ 2013-12-24 1:02 ` Anton Blanchard
2013-12-24 3:34 ` Michael Ellerman
0 siblings, 1 reply; 5+ messages in thread
From: Anton Blanchard @ 2013-12-24 1:02 UTC (permalink / raw)
To: Michael Ellerman; +Cc: paulmck, paulus, linuxppc-dev
Hi Michael,
> > To try and catch any screw ups in our ppc64 memcpy and
> > copy_tofrom_user loops, I wrote a quick test:
> >
> > http://ozlabs.org/~anton/junkcode/validate_kernel_copyloops.tar.gz
>
> Nice! How's this look?
Love it!
At the moment my other copy_to/from_user tests run against the kernel
(testing we copy all data right up to a page fault and that we return
the correct number of bytes not copied etc). A small signal handler
that walks the exception entries and branches to the handler should be
all it takes to do it completely in userspace.
Anton
>
> cheers
>
>
> selftests: Import Anton's memcpy / copy_tofrom_user tests
>
> Turn Anton's memcpy / copy_tofrom_user test into something that can
> live in tools/testing/selftests.
>
> It requires one turd in arch/powerpc/lib/memcpy_64.S, but it's pretty
> harmless IMHO.
>
> We are sailing very close to the wind with the feature macros. We
> define them to nothing, which currently means we get a few extra nops
> and include the unaligned calls.
>
> ---
> arch/powerpc/lib/memcpy_64.S | 2 +
> tools/testing/selftests/powerpc/Makefile | 2 +-
> tools/testing/selftests/powerpc/copyloops/Makefile | 29 +++++++
> .../selftests/powerpc/copyloops/asm/ppc_asm.h | 86
> +++++++++++++++++++ .../selftests/powerpc/copyloops/asm/processor.h
> | 0 .../selftests/powerpc/copyloops/copyuser_64.S | 1 +
> .../selftests/powerpc/copyloops/copyuser_power7.S | 1 +
> .../selftests/powerpc/copyloops/memcpy_64.S | 1 +
> .../selftests/powerpc/copyloops/memcpy_power7.S | 1 +
> .../testing/selftests/powerpc/copyloops/validate.c | 99
> ++++++++++++++++++++++
> tools/testing/selftests/powerpc/utils.h | 3 + 11 files
> changed, 224 insertions(+), 1 deletion(-) create mode 100644
> tools/testing/selftests/powerpc/copyloops/Makefile create mode 100644
> tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h create mode
> 100644 tools/testing/selftests/powerpc/copyloops/asm/processor.h
> create mode 120000
> tools/testing/selftests/powerpc/copyloops/copyuser_64.S create mode
> 120000 tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
> create mode 120000
> tools/testing/selftests/powerpc/copyloops/memcpy_64.S create mode
> 120000 tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
> create mode 100644
> tools/testing/selftests/powerpc/copyloops/validate.c
>
> diff --git a/arch/powerpc/lib/memcpy_64.S
> b/arch/powerpc/lib/memcpy_64.S index d2bbbc8..72ad055 100644
> --- a/arch/powerpc/lib/memcpy_64.S
> +++ b/arch/powerpc/lib/memcpy_64.S
> @@ -14,7 +14,9 @@ _GLOBAL(memcpy)
> BEGIN_FTR_SECTION
> std r3,48(r1) /* save destination pointer for
> return value */ FTR_SECTION_ELSE
> +#ifndef SELFTEST
> b memcpy_power7
> +#endif
> ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
> PPC_MTOCRF(0x01,r5)
> cmpldi cr1,r5,16
> diff --git a/tools/testing/selftests/powerpc/Makefile
> b/tools/testing/selftests/powerpc/Makefile index bd24ae5..316194f
> 100644 --- a/tools/testing/selftests/powerpc/Makefile
> +++ b/tools/testing/selftests/powerpc/Makefile
> @@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror
> -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR
> export CC CFLAGS
>
> -TARGETS = pmu
> +TARGETS = pmu copyloops
>
> endif
>
> diff --git a/tools/testing/selftests/powerpc/copyloops/Makefile
> b/tools/testing/selftests/powerpc/copyloops/Makefile new file mode
> 100644 index 0000000..6f2d3be
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/Makefile
> @@ -0,0 +1,29 @@
> +# The loops are all 64-bit code
> +CFLAGS += -m64
> +CFLAGS += -I$(CURDIR)
> +CFLAGS += -D SELFTEST
> +
> +# Use our CFLAGS for the implicit .S rule
> +ASFLAGS = $(CFLAGS)
> +
> +PROGS := copyuser_64 copyuser_power7 memcpy_64 memcpy_power7
> +EXTRA_SOURCES := validate.c ../harness.c
> +
> +all: $(PROGS)
> +
> +copyuser_64: CPPFLAGS += -D
> COPY_LOOP=test___copy_tofrom_user_base +copyuser_power7: CPPFLAGS +=
> -D COPY_LOOP=test___copy_tofrom_user_power7 +memcpy_64:
> CPPFLAGS += -D COPY_LOOP=test_memcpy +memcpy_power7: CPPFLAGS += -D
> COPY_LOOP=test_memcpy_power7 +
> +$(PROGS): $(EXTRA_SOURCES)
> +
> +run_tests: all
> + @-for PROG in $(PROGS); do \
> + ./$$PROG; \
> + done;
> +
> +clean:
> + rm -f $(PROGS) *.o
> +
> +.PHONY: all run_tests clean
> diff --git a/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h
> b/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h new file
> mode 100644 index 0000000..ccd9c84
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h
> @@ -0,0 +1,86 @@
> +#include <ppc-asm.h>
> +
> +#define CONFIG_ALTIVEC
> +
> +#define r1 1
> +
> +#define vr0 0
> +#define vr1 1
> +#define vr2 2
> +#define vr3 3
> +#define vr4 4
> +#define vr5 5
> +#define vr6 6
> +#define vr7 7
> +#define vr8 8
> +#define vr9 9
> +#define vr10 10
> +#define vr11 11
> +#define vr12 12
> +#define vr13 13
> +#define vr14 14
> +#define vr15 15
> +#define vr16 16
> +#define vr17 17
> +#define vr18 18
> +#define vr19 19
> +#define vr20 20
> +#define vr21 21
> +#define vr22 22
> +#define vr23 23
> +#define vr24 24
> +#define vr25 25
> +#define vr26 26
> +#define vr27 27
> +#define vr28 28
> +#define vr29 29
> +#define vr30 30
> +#define vr31 31
> +
> +#define R14 r14
> +#define R15 r15
> +#define R16 r16
> +#define R17 r17
> +#define R18 r18
> +#define R19 r19
> +#define R20 r20
> +#define R21 r21
> +#define R22 r22
> +
> +#define STACKFRAMESIZE 256
> +#define STK_PARAM(i) (48 + ((i)-3)*8)
> +#define STK_REG(i) (112 + ((i)-14)*8)
> +
> +#define _GLOBAL(A) FUNC_START(test_ ## A)
> +
> +#define PPC_MTOCRF(A, B) mtocrf A, B
> +
> +FUNC_START(enter_vmx_usercopy)
> + li r3,1
> + blr
> +
> +FUNC_START(exit_vmx_usercopy)
> + li r3,0
> + blr
> +
> +FUNC_START(enter_vmx_copy)
> + li r3,1
> + blr
> +
> +FUNC_START(exit_vmx_copy)
> + blr
> +
> +FUNC_START(memcpy_power7)
> + blr
> +
> +FUNC_START(__copy_tofrom_user_power7)
> + blr
> +
> +FUNC_START(__copy_tofrom_user_base)
> + blr
> +
> +#define BEGIN_FTR_SECTION
> +#define FTR_SECTION_ELSE
> +#define ALT_FTR_SECTION_END_IFCLR(x)
> +#define ALT_FTR_SECTION_END(x, y)
> +#define END_FTR_SECTION_IFCLR(x)
> diff --git
> a/tools/testing/selftests/powerpc/copyloops/asm/processor.h
> b/tools/testing/selftests/powerpc/copyloops/asm/processor.h new file
> mode 100644 index 0000000..e69de29 diff --git
> a/tools/testing/selftests/powerpc/copyloops/copyuser_64.S
> b/tools/testing/selftests/powerpc/copyloops/copyuser_64.S new file
> mode 120000 index 0000000..f1c418a --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/copyuser_64.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/copyuser_64.S
> \ No newline at end of file
> diff --git
> a/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
> b/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S new
> file mode 120000 index 0000000..4786895 --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/copyuser_power7.S
> \ No newline at end of file
> diff --git a/tools/testing/selftests/powerpc/copyloops/memcpy_64.S
> b/tools/testing/selftests/powerpc/copyloops/memcpy_64.S new file mode
> 120000 index 0000000..cce33fb
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/memcpy_64.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/memcpy_64.S
> \ No newline at end of file
> diff --git
> a/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
> b/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S new file
> mode 120000 index 0000000..0d6fbfa --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/memcpy_power7.S
> \ No newline at end of file
> diff --git a/tools/testing/selftests/powerpc/copyloops/validate.c
> b/tools/testing/selftests/powerpc/copyloops/validate.c new file mode
> 100644 index 0000000..1750ff5
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/copyloops/validate.c
> @@ -0,0 +1,99 @@
> +#include <malloc.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <stdbool.h>
> +
> +#include "../utils.h"
> +
> +#define MAX_LEN 8192
> +#define MAX_OFFSET 16
> +#define MIN_REDZONE 128
> +#define BUFLEN (MAX_LEN+MAX_OFFSET+2*MIN_REDZONE)
> +#define POISON 0xa5
> +
> +unsigned long COPY_LOOP(void *to, const void *from, unsigned long
> size); +
> +static void do_one(char *src, char *dst, unsigned long src_off,
> + unsigned long dst_off, unsigned long len, void
> *redzone,
> + void *fill)
> +{
> + char *srcp, *dstp;
> + unsigned long ret;
> + unsigned long i;
> +
> + srcp = src + MIN_REDZONE + src_off;
> + dstp = dst + MIN_REDZONE + dst_off;
> +
> + memset(src, POISON, BUFLEN);
> + memset(dst, POISON, BUFLEN);
> + memcpy(srcp, fill, len);
> +
> + ret = COPY_LOOP(dstp, srcp, len);
> + if (ret && ret != (unsigned long)dstp) {
> + printf("(%p,%p,%ld) returned %ld\n", dstp, srcp,
> len, ret);
> + abort();
> + }
> +
> + if (memcmp(dstp, srcp, len)) {
> + printf("(%p,%p,%ld) miscompare\n", dstp, srcp, len);
> + printf("src: ");
> + for (i = 0; i < len; i++)
> + printf("%02x ", srcp[i]);
> + printf("\ndst: ");
> + for (i = 0; i < len; i++)
> + printf("%02x ", dstp[i]);
> + printf("\n");
> + abort();
> + }
> +
> + if (memcmp(dst, redzone, dstp - dst)) {
> + printf("(%p,%p,%ld) redzone before corrupted\n",
> + dstp, srcp, len);
> + abort();
> + }
> +
> + if (memcmp(dstp+len, redzone, dst+BUFLEN-(dstp+len))) {
> + printf("(%p,%p,%ld) redzone after corrupted\n",
> + dstp, srcp, len);
> + abort();
> + }
> +}
> +
> +int test_copy_loop(void)
> +{
> + char *src, *dst, *redzone, *fill;
> + unsigned long len, src_off, dst_off;
> + unsigned long i;
> +
> + src = memalign(BUFLEN, BUFLEN);
> + dst = memalign(BUFLEN, BUFLEN);
> + redzone = malloc(BUFLEN);
> + fill = malloc(BUFLEN);
> +
> + if (!src || !dst || !redzone || !fill) {
> + fprintf(stderr, "malloc failed\n");
> + exit(1);
> + }
> +
> + memset(redzone, POISON, BUFLEN);
> +
> + /* Fill with sequential bytes */
> + for (i = 0; i < BUFLEN; i++)
> + fill[i] = i & 0xff;
> +
> + for (len = 1; len < MAX_LEN; len++) {
> + for (src_off = 0; src_off < MAX_OFFSET; src_off++) {
> + for (dst_off = 0; dst_off < MAX_OFFSET;
> dst_off++) {
> + do_one(src, dst, src_off, dst_off,
> len,
> + redzone, fill);
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +int main(void)
> +{
> + return test_harness(test_copy_loop, str(COPY_LOOP));
> +}
> diff --git a/tools/testing/selftests/powerpc/utils.h
> b/tools/testing/selftests/powerpc/utils.h index 5851c4b..0de0644
> 100644 --- a/tools/testing/selftests/powerpc/utils.h
> +++ b/tools/testing/selftests/powerpc/utils.h
> @@ -31,4 +31,7 @@ do
> {
> \ } \ } while
> (0)
> +#define _str(s) #s
> +#define str(s) _str(s)
> +
> #endif /* _SELFTESTS_POWERPC_UTILS_H */
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian
2013-12-24 1:02 ` Anton Blanchard
@ 2013-12-24 3:34 ` Michael Ellerman
0 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2013-12-24 3:34 UTC (permalink / raw)
To: Anton Blanchard; +Cc: paulmck, paulus, linuxppc-dev
On Tue, 2013-12-24 at 12:02 +1100, Anton Blanchard wrote:
> Hi Michael,
>
> > > To try and catch any screw ups in our ppc64 memcpy and
> > > copy_tofrom_user loops, I wrote a quick test:
> > >
> > > http://ozlabs.org/~anton/junkcode/validate_kernel_copyloops.tar.gz
> >
> > Nice! How's this look?
>
> Love it!
Cool, I'll add your Signed-off-by and resubmit.
> At the moment my other copy_to/from_user tests run against the kernel
> (testing we copy all data right up to a page fault and that we return
> the correct number of bytes not copied etc). A small signal handler
> that walks the exception entries and branches to the handler should be
> all it takes to do it completely in userspace.
That'd be nice. Are they in your junkcode? I couldn't spot them at a glance.
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-12-24 3:34 UTC | newest]
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2013-12-17 22:29 [PATCH] powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian Anton Blanchard
2013-12-18 10:15 ` Anton Blanchard
2013-12-19 13:17 ` Michael Ellerman
2013-12-24 1:02 ` Anton Blanchard
2013-12-24 3:34 ` Michael Ellerman
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