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drm/i915/selftests: Fill all the drm_vma_manager holes

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To test mmap_offset_exhaustion, we first have to fill the entire vma
manager leaving a single page. Don't assume that the vma manager is not
already fragment, and fill all the holes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191111122706.28292-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-11-11 12:27:06 +00:00
parent 34485832cb
commit 1af65515e3
1 changed files with 41 additions and 14 deletions
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55
drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
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@ -607,28 +607,49 @@ static int igt_mmap_offset_exhaustion(void *arg)
struct drm_i915_private *i915 = arg;
struct drm_mm *mm = &i915->drm.vma_offset_manager->vm_addr_space_mm;
struct drm_i915_gem_object *obj;
struct drm_mm_node resv, *hole;
u64 hole_start, hole_end;
struct drm_mm_node *hole, *next;
int loop, err;
/* Disable background reaper */
disable_retire_worker(i915);
GEM_BUG_ON(!i915->gt.awake);
intel_gt_retire_requests(&i915->gt);
i915_gem_drain_freed_objects(i915);
/* Trim the device mmap space to only a page */
memset(&resv, 0, sizeof(resv));
drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
resv.start = hole_start;
resv.size = hole_end - hole_start - 1; /* PAGE_SIZE units */
mmap_offset_lock(i915);
err = drm_mm_reserve_node(mm, &resv);
mmap_offset_unlock(i915);
if (err) {
pr_err("Failed to trim VMA manager, err=%d\n", err);
mmap_offset_lock(i915);
loop = 1; /* PAGE_SIZE units */
list_for_each_entry_safe(hole, next, &mm->hole_stack, hole_stack) {
struct drm_mm_node *resv;
resv = kzalloc(sizeof(*resv), GFP_NOWAIT);
if (!resv) {
err = -ENOMEM;
goto out_park;
}
resv->start = drm_mm_hole_node_start(hole) + loop;
resv->size = hole->hole_size - loop;
resv->color = -1ul;
loop = 0;
if (!resv->size) {
kfree(resv);
continue;
}
pr_debug("Reserving hole [%llx + %llx]\n",
resv->start, resv->size);
err = drm_mm_reserve_node(mm, resv);
if (err) {
pr_err("Failed to trim VMA manager, err=%d\n", err);
kfree(resv);
goto out_park;
}
break;
}
GEM_BUG_ON(!list_is_singular(&mm->hole_stack));
mmap_offset_unlock(i915);
/* Just fits! */
if (!assert_mmap_offset(i915, PAGE_SIZE, 0)) {
@ -685,9 +706,15 @@ static int igt_mmap_offset_exhaustion(void *arg)
out:
mmap_offset_lock(i915);
drm_mm_remove_node(&resv);
mmap_offset_unlock(i915);
out_park:
drm_mm_for_each_node_safe(hole, next, mm) {
if (hole->color != -1ul)
continue;
drm_mm_remove_node(hole);
kfree(hole);
}
mmap_offset_unlock(i915);
restore_retire_worker(i915);
return err;
err_obj: