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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include "igt.h"
#include "igt_kmod.h"
#include "i915/gem_create.h"
#include "i915/gem.h"
/**
* TEST: gem lmem evict
* Description: Force tiny lmem size for easily testing eviction scenarios.
* Category: Core
* Mega feature: General Core features
* Sub-category: Memory management tests
* Functionality: local memory eviction
* Feature: local_memory
* Test category: GEM_Legacy
*
* SUBTEST: dontneed-evict-race
* Description: Regression test to verify that madvise will sync against busy dma-resv object for lmem
*/
IGT_TEST_DESCRIPTION("Force tiny lmem size for easily testing eviction scenarios.");
#define PAGE_SIZE 4096
static uint32_t batch_create_size(int fd, uint64_t size)
{
const uint32_t bbe = MI_BATCH_BUFFER_END;
uint32_t handle;
handle = gem_create(fd, size);
gem_write(fd, handle, 0, &bbe, sizeof(bbe));
return handle;
}
static int upload(int fd, uint32_t handle)
{
struct drm_i915_gem_exec_object2 exec[2] = {};
struct drm_i915_gem_execbuffer2 execbuf = {
.buffers_ptr = to_user_pointer(&exec),
.buffer_count = 2,
};
exec[0].handle = handle;
exec[0].flags = EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
exec[1].handle = batch_create_size(fd, PAGE_SIZE);
exec[1].flags = EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
gem_execbuf(fd, &execbuf);
return 0;
}
static void test_dontneed_evict_race(int fd,
struct gem_memory_region *region)
{
const uint64_t size = region->size >> 1;
uint64_t ahnd = get_reloc_ahnd(fd, 0);
uint32_t handle1;
igt_spin_t *spin;
handle1 = gem_create_in_memory_region_list(fd, size, 0,
®ion->ci, 1);
spin = igt_spin_new(fd,
.ahnd = ahnd,
.dependency = handle1);
igt_fork(child, 1) {
uint32_t handle2;
fd = drm_reopen_driver(fd);
handle2 = gem_create_in_memory_region_list(fd,
size, 0,
®ion->ci, 1);
/*
* The actual move when evicting will be pipelined
* behind the spinner, so can't fire until the spinner
* is killed.
*/
upload(fd, handle2);
gem_close(fd, handle2);
}
sleep(2); /* Give eviction time to find handle1 */
igt_spin_end(spin);
gem_madvise(fd, handle1, I915_MADV_DONTNEED);
igt_waitchildren();
igt_spin_free(fd, spin);
gem_close(fd, handle1);
}
igt_main
{
struct drm_i915_query_memory_regions *regions;
int i915 = -1;
igt_fixture {
char *tmp;
if (igt_kmod_is_loaded("i915")) {
i915 = __drm_open_driver(DRIVER_INTEL);
igt_require_fd(i915);
igt_require_gem(i915);
igt_require(gem_has_lmem(i915));
drm_close_driver(i915);
}
igt_i915_driver_unload();
/*
* To avoid running of ring space and stalling during evicting
* (while holding the dma-resv lock), we need to use a smaller
* lmem size, such we can easliy trigger eviction without
* needing to wait for more ring space. The point of the test is
* to mark the object as DONTNEED which has an in-progress
* pipilined unbind/move, which also requires grabbing the
* dma-resv lock.
*/
igt_assert_eq(igt_i915_driver_load("lmem_size=128"), 0);
i915 = __drm_open_driver(DRIVER_INTEL);
igt_require_fd(i915);
igt_require_gem(i915);
igt_require(gem_has_lmem(i915));
tmp = __igt_params_get(i915, "lmem_size");
igt_skip_on(!tmp);
free(tmp);
regions = gem_get_query_memory_regions(i915);
igt_require(regions);
}
igt_describe("Regression test to verify that madvise will sync against busy dma-resv object for lmem");
igt_subtest("dontneed-evict-race") {
for_each_memory_region(r, i915) {
if (r->ci.memory_class == I915_MEMORY_CLASS_DEVICE) {
test_dontneed_evict_race(i915, r);
break;
}
}
}
igt_fixture {
drm_close_driver(i915);
igt_i915_driver_unload();
}
}
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