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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2018 Intel Corporation
*/
#include <linux/random.h>
#include "gem/selftests/igt_gem_utils.h"
#include "gem/selftests/mock_context.h"
#include "gt/intel_gt.h"
#include "i915_selftest.h"
#include "igt_flush_test.h"
#include "mock_drm.h"
static int switch_to_context(struct drm_i915_private *i915,
struct i915_gem_context *ctx)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
for_each_engine(engine, i915, id) {
struct i915_request *rq;
rq = igt_request_alloc(ctx, engine);
if (IS_ERR(rq))
return PTR_ERR(rq);
i915_request_add(rq);
}
return 0;
}
static void trash_stolen(struct drm_i915_private *i915)
{
struct i915_ggtt *ggtt = &i915->ggtt;
const u64 slot = ggtt->error_capture.start;
const resource_size_t size = resource_size(&i915->dsm);
unsigned long page;
u32 prng = 0x12345678;
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 pm_prepare(struct drm_i915_private *i915)
{
i915_gem_suspend(i915);
return 0;
}
static void pm_suspend(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
i915_gem_suspend_gtt_mappings(i915);
i915_gem_suspend_late(i915);
}
}
static void pm_hibernate(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
i915_gem_suspend_gtt_mappings(i915);
i915_gem_freeze(i915);
i915_gem_freeze_late(i915);
}
}
static void 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) {
intel_gt_sanitize(&i915->gt, false);
i915_gem_sanitize(i915);
i915_gem_restore_gtt_mappings(i915);
i915_gem_restore_fences(&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 drm_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(i915, ctx);
if (err)
goto out;
err = pm_prepare(i915);
if (err)
goto out;
pm_suspend(i915);
/* Here be dragons! Note that with S3RST any S3 may become S4! */
simulate_hibernate(i915);
pm_resume(i915);
err = switch_to_context(i915, ctx);
out:
mock_file_free(i915, file);
return err;
}
static int igt_gem_hibernate(void *arg)
{
struct drm_i915_private *i915 = arg;
struct i915_gem_context *ctx;
struct drm_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(i915, ctx);
if (err)
goto out;
err = pm_prepare(i915);
if (err)
goto out;
pm_hibernate(i915);
/* Here be dragons! */
simulate_hibernate(i915);
pm_resume(i915);
err = switch_to_context(i915, ctx);
out:
mock_file_free(i915, file);
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),
};
if (intel_gt_is_wedged(&i915->gt))
return 0;
return i915_live_subtests(tests, i915);
}
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