Exercise new API to probe that the userptr range is valid (backed by
struct pages and not pfn) or to populate the userptr upon creation (by
calling get_user_pages() on the range).
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
tests/gem_userptr_blits.c | 140 ++++++++++++++++++++++++++++++++++++++
1 file changed, 140 insertions(+)
diff --git a/tests/gem_userptr_blits.c b/tests/gem_userptr_blits.c
index 7e3b6ef38..0c2bdf5b2 100644
--- a/tests/gem_userptr_blits.c
+++ b/tests/gem_userptr_blits.c
@@ -557,6 +557,140 @@ static int test_invalid_gtt_mapping(int fd)
return 0;
}
+static void store_dword(int fd, uint32_t target,
+ uint32_t offset, uint32_t value)
+{
+ const int gen = intel_gen(intel_get_drm_devid(fd));
+ struct drm_i915_gem_exec_object2 obj[2];
+ struct drm_i915_gem_relocation_entry reloc;
+ struct drm_i915_gem_execbuffer2 execbuf;
+ uint32_t batch[16];
+ int i;
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ execbuf.buffers_ptr = to_user_pointer(obj);
+ execbuf.buffer_count = ARRAY_SIZE(obj);
+ execbuf.flags = 0;
+ if (gen < 6)
+ execbuf.flags |= I915_EXEC_SECURE;
+
+ memset(obj, 0, sizeof(obj));
+ obj[0].handle = target;
+ obj[1].handle = gem_create(fd, 4096);
+
+ memset(&reloc, 0, sizeof(reloc));
+ reloc.target_handle = obj[0].handle;
+ reloc.presumed_offset = 0;
+ reloc.offset = sizeof(uint32_t);
+ reloc.delta = offset;
+ reloc.read_domains = I915_GEM_DOMAIN_RENDER;
+ reloc.write_domain = I915_GEM_DOMAIN_RENDER;
+ obj[1].relocs_ptr = to_user_pointer(&reloc);
+ obj[1].relocation_count = 1;
+
+ i = 0;
+ batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
+ if (gen >= 8) {
+ batch[++i] = offset;
+ batch[++i] = 0;
+ } else if (gen >= 4) {
+ batch[++i] = 0;
+ batch[++i] = offset;
+ reloc.offset += sizeof(uint32_t);
+ } else {
+ batch[i]--;
+ batch[++i] = offset;
+ }
+ batch[++i] = value;
+ batch[++i] = MI_BATCH_BUFFER_END;
+ gem_write(fd, obj[1].handle, 0, batch, sizeof(batch));
+ gem_execbuf(fd, &execbuf);
+ gem_close(fd, obj[1].handle);
+}
+
+#define LOCAL_USERPTR_PROBE 0x2
+#define LOCAL_USERPTR_POPULATE 0x4
+static void test_probe(int fd, unsigned int flags)
+{
+#define N_PAGES 5
+ struct drm_i915_gem_mmap_gtt mmap_gtt;
+ uint32_t handle;
+
+ igt_require(__gem_userptr(fd,
+ (void *)-PAGE_SIZE, 2*PAGE_SIZE, 0,
+ flags, &handle) == -EFAULT);
+
+ /*
+ * We allocate 5 pages, and apply various combinations
+ * of unmap, remap-gtt to the pages. Then we try to
+ * create a userptr from the middle 3 pages and check
+ * if unexpectedly succeeds or fails.
+ */
+ memset(&mmap_gtt, 0, sizeof(mmap_gtt));
+ mmap_gtt.handle = gem_create(fd, PAGE_SIZE);
+ drmIoctl(fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &mmap_gtt);
+
+ for (unsigned long pass = 0; pass < 4 * 4 * 4 * 4 *4; pass++) {
+ int expected = 0;
+ void *ptr;
+
+ ptr = mmap(NULL, N_PAGES * PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS,
+ -1, 0);
+
+ for (int page = 0; page < N_PAGES; page++) {
+ int mode = (pass >> (2 * page)) & 3;
+ void *fixed = ptr + page * PAGE_SIZE;
+
+ switch (mode) {
+ default:
+ case 0:
+ break;
+
+ case 1:
+ munmap(fixed, PAGE_SIZE);
+ if (page >= 1 && page <= 3)
+ expected = -EFAULT;
+ break;
+
+ case 2:
+ fixed = mmap(fixed, PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_FIXED,
+ fd, mmap_gtt.offset);
+ igt_assert(fixed != MAP_FAILED);
+ if (page >= 1 && page <= 3)
+ expected = -EFAULT;
+ break;
+ }
+ }
+
+ errno = 0;
+ handle = 0;
+ igt_assert_eq(__gem_userptr(fd, ptr + PAGE_SIZE, 3*PAGE_SIZE,
+ 0, flags, &handle),
+ expected);
+ if (handle) {
+ for (int page = 0; page < 3; page++)
+ store_dword(fd, handle, page*4096, handle);
+
+ gem_sync(fd, handle);
+
+ for (int page = 1; page <= 3; page++)
+ igt_assert_eq(*(uint32_t *)(ptr + page*PAGE_SIZE),
+ handle);
+
+ gem_close(fd, handle);
+ }
+
+ munmap(ptr, N_PAGES * PAGE_SIZE);
+ }
+
+ gem_close(fd, mmap_gtt.handle);
+#undef N_PAGES
+}
+
#define PE_GTT_MAP 0x1
#define PE_BUSY 0x2
static void test_process_exit(int fd, int flags)
@@ -1464,6 +1598,12 @@ int main(int argc, char **argv)
igt_subtest("invalid-gtt-mapping")
test_invalid_gtt_mapping(fd);
+ igt_subtest("probe")
+ test_probe(fd, LOCAL_USERPTR_PROBE);
+
+ igt_subtest("populate")
+ test_probe(fd, LOCAL_USERPTR_POPULATE);
+
igt_subtest("forked-access")
test_forked_access(fd);
--
2.17.0
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