tests/misc: Add a store/dcbz test

We have a bug where an store near a dcbz can cause the dcbz to only zero
8 bytes. Add a test case for this.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
icbi-issue
Anton Blanchard 3 years ago committed by Anton Blanchard
parent 00259458c7
commit 2d142a6c01

@ -215,3 +215,45 @@ test_icbi:
nop
addi %r3,%r3,1
blr

.global test_dcbz_near_store
test_dcbz_near_store:
li %r0,-1
addi %r10,%r1,-64
# cacheline align stack pointer
srdi %r10,%r10,6
sldi %r10,%r10,6

std %r0,0(%r10)
std %r0,8(%r10)
std %r0,16(%r10)
std %r0,24(%r10)
std %r0,32(%r10)
std %r0,40(%r10)
std %r0,48(%r10)
std %r0,56(%r10)

li %r3,0xa5
# Store to same cacheline as dcbz, although it doesn't seem
# necessary to hit the issue.
std %r3,0(%r10)
dcbz 0,%r10

ld %r0,0(%r10)
ld %r3,8(%r10)
ld %r4,16(%r10)
ld %r5,24(%r10)
ld %r6,32(%r10)
ld %r7,40(%r10)
ld %r8,48(%r10)
ld %r9,56(%r10)

or %r3,%r3,%r0
or %r3,%r3,%r4
or %r3,%r3,%r5
or %r3,%r3,%r6
or %r3,%r3,%r7
or %r3,%r3,%r8
or %r3,%r3,%r9

blr

@ -17,6 +17,7 @@ extern long test_mtpvr(void);
extern long test_bdnzl(void);
extern long test_loadhitstore(void);
extern long test_icbi(void);
extern long test_dcbz_near_store(void);

// i < 100
void print_test_number(int i)
@ -82,5 +83,12 @@ int main(void)
} else
puts(PASS);

print_test_number(8);
if (test_dcbz_near_store() != 0) {
fail = 1;
puts(FAIL);
} else
puts(PASS);

return fail;
}

Binary file not shown.

@ -5,3 +5,4 @@ Test 04:PASS
Test 05:PASS
Test 06:PASS
Test 07:PASS
Test 08:PASS

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