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drm/i915: Test exhaustion of the mmap space

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An unlikely error condition that we can simulate by stealing most of
the range before trying to insert new objects.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-20-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-02-13 17:15:31 +00:00
parent 48d8981720
commit 3d81d589d6
1 changed files with 138 additions and 0 deletions
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138
drivers/gpu/drm/i915/selftests/i915_gem_object.c
View File

@ -25,6 +25,7 @@
#include "../i915_selftest.h"
#include "mock_gem_device.h"
#include "huge_gem_object.h"
static int igt_gem_object(void *arg)
{
@ -432,6 +433,142 @@ out:
return err;
}
static int make_obj_busy(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct drm_i915_gem_request *rq;
struct i915_vma *vma;
int err;
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma))
return PTR_ERR(vma);
err = i915_vma_pin(vma, 0, 0, PIN_USER);
if (err)
return err;
rq = i915_gem_request_alloc(i915->engine[RCS], i915->kernel_context);
if (IS_ERR(rq)) {
i915_vma_unpin(vma);
return PTR_ERR(rq);
}
i915_vma_move_to_active(vma, rq, 0);
i915_add_request(rq);
i915_gem_object_set_active_reference(obj);
i915_vma_unpin(vma);
return 0;
}
static bool assert_mmap_offset(struct drm_i915_private *i915,
unsigned long size,
int expected)
{
struct drm_i915_gem_object *obj;
int err;
obj = i915_gem_object_create_internal(i915, size);
if (IS_ERR(obj))
return PTR_ERR(obj);
err = i915_gem_object_create_mmap_offset(obj);
i915_gem_object_put(obj);
return err == expected;
}
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;
int loop, err;
/* 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 */
err = drm_mm_reserve_node(mm, &resv);
if (err) {
pr_err("Failed to trim VMA manager, err=%d\n", err);
return err;
}
break;
}
/* Just fits! */
if (!assert_mmap_offset(i915, PAGE_SIZE, 0)) {
pr_err("Unable to insert object into single page hole\n");
err = -EINVAL;
goto out;
}
/* Too large */
if (!assert_mmap_offset(i915, 2*PAGE_SIZE, -ENOSPC)) {
pr_err("Unexpectedly succeeded in inserting too large object into single page hole\n");
err = -EINVAL;
goto out;
}
/* Fill the hole, further allocation attempts should then fail */
obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto out;
}
err = i915_gem_object_create_mmap_offset(obj);
if (err) {
pr_err("Unable to insert object into reclaimed hole\n");
goto err_obj;
}
if (!assert_mmap_offset(i915, PAGE_SIZE, -ENOSPC)) {
pr_err("Unexpectedly succeeded in inserting object into no holes!\n");
err = -EINVAL;
goto err_obj;
}
i915_gem_object_put(obj);
/* Now fill with busy dead objects that we expect to reap */
for (loop = 0; loop < 3; loop++) {
obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto out;
}
mutex_lock(&i915->drm.struct_mutex);
err = make_obj_busy(obj);
mutex_unlock(&i915->drm.struct_mutex);
if (err) {
pr_err("[loop %d] Failed to busy the object\n", loop);
goto err_obj;
}
GEM_BUG_ON(!i915_gem_object_is_active(obj));
err = i915_gem_object_create_mmap_offset(obj);
if (err) {
pr_err("[loop %d] i915_gem_object_create_mmap_offset failed with err=%d\n",
loop, err);
goto out;
}
}
out:
drm_mm_remove_node(&resv);
return err;
err_obj:
i915_gem_object_put(obj);
goto out;
}
int i915_gem_object_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
@ -456,6 +593,7 @@ int i915_gem_object_live_selftests(struct drm_i915_private *i915)
static const struct i915_subtest tests[] = {
SUBTEST(igt_gem_huge),
SUBTEST(igt_partial_tiling),
SUBTEST(igt_mmap_offset_exhaustion),
};
return i915_subtests(tests, i915);