[Intel-gfx] [PATCH i-g-t] i915/gem_mmap_gtt: Trim object size for ptracing

[Chris Wilson]

For verifying vm_ops.access we only need a page or two to check we both
advance across a page boundary and find the right offset within a page.
16MiB is overkill for the slow uncached reads through the slow ptrace
interface, so reduce the object size by a couple of orders of magnitude.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
 tests/i915/gem_mmap_gtt.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/tests/i915/gem_mmap_gtt.c b/tests/i915/gem_mmap_gtt.c
index 6637bba06..3cce19e9a 100644
--- a/tests/i915/gem_mmap_gtt.c
+++ b/tests/i915/gem_mmap_gtt.c
@@ -525,6 +525,7 @@ static void *memchr_inv(const void *s, int c, size_t n)
 static void
 test_ptrace(int fd)
 {
+       unsigned long sz = 16 * 4096;
        unsigned long AA, CC;
        unsigned long *gtt, *cpy;
        uint32_t bo;
@@ -533,16 +534,16 @@ test_ptrace(int fd)
        memset(&AA, 0xaa, sizeof(AA));
        memset(&CC, 0x55, sizeof(CC));
 
-       cpy = malloc(OBJECT_SIZE);
-       memset(cpy, AA, OBJECT_SIZE);
+       cpy = malloc(sz);
+       memset(cpy, AA, sz);
 
-       bo = gem_create(fd, OBJECT_SIZE);
-       gtt = mmap_bo(fd, bo, OBJECT_SIZE);
-       memset(gtt, CC, OBJECT_SIZE);
+       bo = gem_create(fd, sz);
+       gtt = mmap_bo(fd, bo, sz);
+       memset(gtt, CC, sz);
        gem_close(fd, bo);
 
-       igt_assert(!memchr_inv(gtt, CC, OBJECT_SIZE));
-       igt_assert(!memchr_inv(cpy, AA, OBJECT_SIZE));
+       igt_assert(!memchr_inv(gtt, CC, sz));
+       igt_assert(!memchr_inv(cpy, AA, sz));
 
        igt_fork(child, 1) {
                ptrace(PTRACE_TRACEME, 0, NULL, NULL);
@@ -553,7 +554,7 @@ test_ptrace(int fd)
        pid = wait(NULL);
 
        ptrace(PTRACE_ATTACH, pid, NULL, NULL);
-       for (int i = 0; i < OBJECT_SIZE / sizeof(long); i++) {
+       for (int i = 0; i < sz / sizeof(long); i++) {
                long ret;
 
                ret = ptrace(PTRACE_PEEKDATA, pid, gtt + i);
@@ -570,10 +571,10 @@ test_ptrace(int fd)
        igt_waitchildren();
 
        /* The contents of the two buffers should now be swapped */
-       igt_assert(!memchr_inv(gtt, AA, OBJECT_SIZE));
-       igt_assert(!memchr_inv(cpy, CC, OBJECT_SIZE));
+       igt_assert(!memchr_inv(gtt, AA, sz));
+       igt_assert(!memchr_inv(cpy, CC, sz));
 
-       munmap(gtt, OBJECT_SIZE);
+       munmap(gtt, sz);
        free(cpy);
 }
 
-- 
2.28.0

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