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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2018 Intel Corporation
*/
#include <linux/random.h>
#include "gem/i915_gem_internal.h"
#include "gem/i915_gem_pm.h"
#include "gem/selftests/igt_gem_utils.h"
#include "gem/selftests/mock_context.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_pm.h"
#include "i915_selftest.h"
#include "igt_flush_test.h"
#include "mock_drm.h"
static int switch_to_context(struct i915_gem_context *ctx)
{
struct i915_gem_engines_iter it;
struct intel_context *ce;
int err = 0;
for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
struct i915_request *rq;
rq = intel_context_create_request(ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
break;
}
i915_request_add(rq);
}
i915_gem_context_unlock_engines(ctx);
return err;
}
static void trash_stolen(struct drm_i915_private *i915)
{
struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
const u64 slot = ggtt->error_capture.start;
const resource_size_t size = resource_size(&i915->dsm);
unsigned long page;
u32 prng = 0x12345678;
/* XXX: fsck. needs some more thought... */
if (!i915_ggtt_has_aperture(ggtt))
return;
for (page = 0; page < size; page += PAGE_SIZE) {
const dma_addr_t dma = i915->dsm.start + page;
u32 __iomem *s;
int x;
ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) {
prng = next_pseudo_random32(prng);
iowrite32(prng, &s[x]);
}
io_mapping_unmap_atomic(s);
}
ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
}
static void simulate_hibernate(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
/*
* As a final sting in the tail, invalidate stolen. Under a real S4,
* stolen is lost and needs to be refilled on resume. However, under
* CI we merely do S4-device testing (as full S4 is too unreliable
* for automated testing across a cluster), so to simulate the effect
* of stolen being trashed across S4, we trash it ourselves.
*/
trash_stolen(i915);
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
}
static int igt_pm_prepare(struct drm_i915_private *i915)
{
i915_gem_suspend(i915);
return 0;
}
static void igt_pm_suspend(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
i915_ggtt_suspend(to_gt(i915)->ggtt);
i915_gem_suspend_late(i915);
}
}
static void igt_pm_hibernate(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
i915_ggtt_suspend(to_gt(i915)->ggtt);
i915_gem_freeze(i915);
i915_gem_freeze_late(i915);
}
}
static void igt_pm_resume(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
/*
* Both suspend and hibernate follow the same wakeup path and assume
* that runtime-pm just works.
*/
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
i915_ggtt_resume(to_gt(i915)->ggtt);
i915_gem_resume(i915);
}
}
static int igt_gem_suspend(void *arg)
{
struct drm_i915_private *i915 = arg;
struct i915_gem_context *ctx;
struct file *file;
int err;
file = mock_file(i915);
if (IS_ERR(file))
return PTR_ERR(file);
err = -ENOMEM;
ctx = live_context(i915, file);
if (!IS_ERR(ctx))
err = switch_to_context(ctx);
if (err)
goto out;
err = igt_pm_prepare(i915);
if (err)
goto out;
igt_pm_suspend(i915);
/* Here be dragons! Note that with S3RST any S3 may become S4! */
simulate_hibernate(i915);
igt_pm_resume(i915);
err = switch_to_context(ctx);
out:
fput(file);
return err;
}
static int igt_gem_hibernate(void *arg)
{
struct drm_i915_private *i915 = arg;
struct i915_gem_context *ctx;
struct file *file;
int err;
file = mock_file(i915);
if (IS_ERR(file))
return PTR_ERR(file);
err = -ENOMEM;
ctx = live_context(i915, file);
if (!IS_ERR(ctx))
err = switch_to_context(ctx);
if (err)
goto out;
err = igt_pm_prepare(i915);
if (err)
goto out;
igt_pm_hibernate(i915);
/* Here be dragons! */
simulate_hibernate(i915);
igt_pm_resume(i915);
err = switch_to_context(ctx);
out:
fput(file);
return err;
}
static int igt_gem_ww_ctx(void *arg)
{
struct drm_i915_private *i915 = arg;
struct drm_i915_gem_object *obj, *obj2;
struct i915_gem_ww_ctx ww;
int err = 0;
obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
obj2 = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj2)) {
err = PTR_ERR(obj2);
goto put1;
}
i915_gem_ww_ctx_init(&ww, true);
retry:
/* Lock the objects, twice for good measure (-EALREADY handling) */
err = i915_gem_object_lock(obj, &ww);
if (!err)
err = i915_gem_object_lock_interruptible(obj, &ww);
if (!err)
err = i915_gem_object_lock_interruptible(obj2, &ww);
if (!err)
err = i915_gem_object_lock(obj2, &ww);
if (err == -EDEADLK) {
err = i915_gem_ww_ctx_backoff(&ww);
if (!err)
goto retry;
}
i915_gem_ww_ctx_fini(&ww);
i915_gem_object_put(obj2);
put1:
i915_gem_object_put(obj);
return err;
}
int i915_gem_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_gem_suspend),
SUBTEST(igt_gem_hibernate),
SUBTEST(igt_gem_ww_ctx),
};
if (intel_gt_is_wedged(to_gt(i915)))
return 0;
return i915_live_subtests(tests, i915);
}
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