On 4/12/2024 2:42 AM, Andi Shyti wrote:
From: Chris Wilson <chris.p.wilson@xxxxxxxxxxxxxxx>
Based on a test case developed by Lionel Landwerlin, this exercises
creation of partial mmaps using both direct methods of a partial mmap()
(where the mmap() only covers a portion of the object) and
munmap() to do the same.
Signed-off-by: Chris Wilson <chris.p.wilson@xxxxxxxxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
---
tests/intel/gem_mmap_offset.c | 84 +++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/tests/intel/gem_mmap_offset.c b/tests/intel/gem_mmap_offset.c
index 95d2158ca88f..0ba2f9591f85 100644
--- a/tests/intel/gem_mmap_offset.c
+++ b/tests/intel/gem_mmap_offset.c
@@ -56,6 +56,8 @@
* SUBTEST: isolation
* SUBTEST: oob-read
* SUBTEST: open-flood
+ * SUBTEST: partial-mmap
+ * SUBTEST: partial-unmap
* SUBTEST: perf
* SUBTEST: pf-nonblock
* SUBTEST: ptrace
@@ -874,6 +876,83 @@ static void blt_coherency(int i915)
igt_assert_f(compare_ok, "Problem with coherency, flush is too late\n");
}
+static void partial_mmap(int i915)
+{
+ uint32_t handle;
+
+ handle = gem_create(i915, SZ_2M);
+
+ for_each_mmap_offset_type(i915, t) {
+ struct drm_i915_gem_mmap_offset arg = {
+ .handle = handle,
+ .flags = t->type,
+ };
+ uint32_t *ptr;
+
+ if (mmap_offset_ioctl(i915, &arg))
+ continue;
+
+ ptr = mmap(0, SZ_4K, PROT_WRITE, MAP_SHARED, i915, arg.offset);
+ if (ptr == MAP_FAILED)
+ continue;
+
+ memset(ptr, 0xcc, SZ_4K);
+ munmap(ptr, SZ_4K);
+
+ ptr = mmap(0, SZ_4K, PROT_READ, MAP_SHARED, i915, arg.offset + SZ_2M - SZ_4K);
+ igt_assert(ptr != MAP_FAILED);
+
+ for (uint32_t i = 0; i < SZ_4K / sizeof(uint32_t); i++)
+ igt_assert_eq_u32(ptr[i], 0);
+
+ munmap(ptr, SZ_4K);
+ }
+
+ gem_close(i915, handle);
+}
+
+static void partial_unmap(int i915)
+{
+ uint32_t handle;
+
+ handle = gem_create(i915, SZ_2M);
+
+ for_each_mmap_offset_type(i915, t) {
+ uint8_t *ptr_a, *ptr_b;
+
+ /* mmap the same GEM BO twice */
+ ptr_a = __mmap_offset(i915, handle, 0, SZ_2M,
+ PROT_READ | PROT_WRITE,
+ t->type);
+ if (!ptr_a)
+ continue;
+
+ ptr_b = __mmap_offset(i915, handle, 0, SZ_2M,
+ PROT_READ | PROT_WRITE,
+ t->type);
+ if (!ptr_b)
+ continue;
+
+ /* unmap the first mapping but the last 4k */
+ munmap(ptr_a, SZ_2M - SZ_4K);
+
+ /* memset that remaining 4k with 0xcc */
+ memset(ptr_a + SZ_2M - SZ_4K, 0xcc, SZ_4K);
+
+ /* memset the first page of the 2Mb with 0xdd */
+ memset(ptr_b, 0xdd, SZ_4K);
+
+ for (uint32_t i = 0; i < SZ_4K; i++)
+ igt_assert_eq_u32(ptr_a[SZ_2M - SZ_4K + i], 0xcc);
+
+ munmap(ptr_a + SZ_2M - SZ_4K, SZ_4K);
+ memset(ptr_b, 0, SZ_2M);
Do we need this extra memset() ? Otherwise
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
+ munmap(ptr_b, SZ_2M);
+ }
+
+ gem_close(i915, handle);
+}
+
static int mmap_gtt_version(int i915)
{
int gtt_version = -1;
@@ -931,6 +1010,11 @@ igt_main
igt_subtest_f("open-flood")
open_flood(i915, 20);
+ igt_subtest_f("partial-mmap")
+ partial_mmap(i915);
+ igt_subtest_f("partial-unmap")
+ partial_unmap(i915);
+
igt_subtest_with_dynamic("clear") {
for_each_memory_region(r, i915) {
igt_dynamic_f("%s", r->name)
