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drm/i915/selftests: mock test io_size

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Check that mappable vs non-mappable matches our expectations.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220225145502.331818-7-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2022-02-25 14:55:02 +00:00
parent f199bf5510
commit 2d45f66887
1 changed files with 143 additions and 0 deletions
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143
drivers/gpu/drm/i915/selftests/intel_memory_region.c
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@ -17,6 +17,7 @@
#include "gem/i915_gem_context.h"
#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "gem/i915_gem_ttm.h"
#include "gem/selftests/igt_gem_utils.h"
#include "gem/selftests/mock_context.h"
#include "gt/intel_engine_pm.h"
@ -512,6 +513,147 @@ out_put:
return err;
}
static u64 igt_object_mappable_total(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mr = obj->mm.region;
struct i915_ttm_buddy_resource *bman_res =
to_ttm_buddy_resource(obj->mm.res);
struct drm_buddy *mm = bman_res->mm;
struct drm_buddy_block *block;
u64 total;
total = 0;
list_for_each_entry(block, &bman_res->blocks, link) {
u64 start = drm_buddy_block_offset(block);
u64 end = start + drm_buddy_block_size(mm, block);
if (start < mr->io_size)
total += min_t(u64, end, mr->io_size) - start;
}
return total;
}
static int igt_mock_io_size(void *arg)
{
struct intel_memory_region *mr = arg;
struct drm_i915_private *i915 = mr->i915;
struct drm_i915_gem_object *obj;
u64 mappable_theft_total;
u64 io_size;
u64 total;
u64 ps;
u64 rem;
u64 size;
I915_RND_STATE(prng);
LIST_HEAD(objects);
int err = 0;
ps = SZ_4K;
if (i915_prandom_u64_state(&prng) & 1)
ps = SZ_64K; /* For something like DG2 */
div64_u64_rem(i915_prandom_u64_state(&prng), SZ_8G, &total);
total = round_down(total, ps);
total = max_t(u64, total, SZ_1G);
div64_u64_rem(i915_prandom_u64_state(&prng), total - ps, &io_size);
io_size = round_down(io_size, ps);
io_size = max_t(u64, io_size, SZ_256M); /* 256M seems to be the common lower limit */
pr_info("%s with ps=%llx, io_size=%llx, total=%llx\n",
__func__, ps, io_size, total);
mr = mock_region_create(i915, 0, total, ps, 0, io_size);
if (IS_ERR(mr)) {
err = PTR_ERR(mr);
goto out_err;
}
mappable_theft_total = 0;
rem = total - io_size;
do {
div64_u64_rem(i915_prandom_u64_state(&prng), rem, &size);
size = round_down(size, ps);
size = max(size, ps);
obj = igt_object_create(mr, &objects, size,
I915_BO_ALLOC_GPU_ONLY);
if (IS_ERR(obj)) {
pr_err("%s TOPDOWN failed with rem=%llx, size=%llx\n",
__func__, rem, size);
err = PTR_ERR(obj);
goto out_close;
}
mappable_theft_total += igt_object_mappable_total(obj);
rem -= size;
} while (rem);
pr_info("%s mappable theft=(%lluMiB/%lluMiB), total=%lluMiB\n",
__func__,
(u64)mappable_theft_total >> 20,
(u64)io_size >> 20,
(u64)total >> 20);
/*
* Even if we allocate all of the non-mappable portion, we should still
* be able to dip into the mappable portion.
*/
obj = igt_object_create(mr, &objects, io_size,
I915_BO_ALLOC_GPU_ONLY);
if (IS_ERR(obj)) {
pr_err("%s allocation unexpectedly failed\n", __func__);
err = PTR_ERR(obj);
goto out_close;
}
close_objects(mr, &objects);
rem = io_size;
do {
div64_u64_rem(i915_prandom_u64_state(&prng), rem, &size);
size = round_down(size, ps);
size = max(size, ps);
obj = igt_object_create(mr, &objects, size, 0);
if (IS_ERR(obj)) {
pr_err("%s MAPPABLE failed with rem=%llx, size=%llx\n",
__func__, rem, size);
err = PTR_ERR(obj);
goto out_close;
}
if (igt_object_mappable_total(obj) != size) {
pr_err("%s allocation is not mappable(size=%llx)\n",
__func__, size);
err = -EINVAL;
goto out_close;
}
rem -= size;
} while (rem);
/*
* We assume CPU access is required by default, which should result in a
* failure here, even though the non-mappable portion is free.
*/
obj = igt_object_create(mr, &objects, ps, 0);
if (!IS_ERR(obj)) {
pr_err("%s allocation unexpectedly succeeded\n", __func__);
err = -EINVAL;
goto out_close;
}
out_close:
close_objects(mr, &objects);
intel_memory_region_destroy(mr);
out_err:
if (err == -ENOMEM)
err = 0;
return err;
}
static int igt_gpu_write_dw(struct intel_context *ce,
struct i915_vma *vma,
u32 dword,
@ -1179,6 +1321,7 @@ int intel_memory_region_mock_selftests(void)
SUBTEST(igt_mock_contiguous),
SUBTEST(igt_mock_splintered_region),
SUBTEST(igt_mock_max_segment),
SUBTEST(igt_mock_io_size),
};
struct intel_memory_region *mem;
struct drm_i915_private *i915;