Re: [PATCH i-g-t v6 7/9] tests/intel/xe_madvise: Add dontneed-after-exec subtest

Sharma, Nishit
2026-04-07T14:52:13Z

On 3/25/2026 6:14 PM, Arvind Yadav wrote:
> This test verifies that memory can be marked purgeable and reclaimed
> after successful GPU execution. The test first executes a batch that
> writes to a data BO and verifies the result. It then marks the BO as
> DONTNEED, triggers memory pressure to purge it, and attempts a second
> execution. The second execution may fail or succeed with scratch
> rebind, validating that the kernel correctly handles purged BOs in
> GPU submissions.
>
> v4:
> - Added proper resource cleanup before calling igt_skip(). (Nishit)
> - Added assertion for xe_bo_map. (Nishit)
> - Now using sync[0] consistently. (Nishit)
> - Added clarifying comment. (Nishit)
>
> Cc: Nishit Sharma <nishit.sharma@intel.com>
> Cc: Matthew Brost <matthew.brost@intel.com>
> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
> Reviewed-by: Pravalika Gurram <pravalika.gurram@intel.com>
> Signed-off-by: Arvind Yadav <arvind.yadav@intel.com>
> ---
> tests/intel/xe_madvise.c | 108 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 108 insertions(+)
>
> diff --git a/tests/intel/xe_madvise.c b/tests/intel/xe_madvise.c
> index d126db9ed..28ea81442 100644
> --- a/tests/intel/xe_madvise.c
> +++ b/tests/intel/xe_madvise.c
> @@ -16,6 +16,7 @@
>
> #include "xe/xe_ioctl.h"
> #include "xe/xe_query.h"
> +#include "lib/igt_syncobj.h"
>
> static bool xe_has_purgeable_support(int fd)
> {
> @@ -444,6 +445,107 @@ static void test_dontneed_before_exec(int fd, struct drm_xe_engine_class_instanc
> xe_vm_destroy(fd, vm);
> }
>
> +/**
> + * SUBTEST: dontneed-after-exec
> + * Description: Mark BO as DONTNEED after GPU exec, verify memory becomes inaccessible
> + * Test category: functionality test
> + */
> +static void test_dontneed_after_exec(int fd, struct drm_xe_engine_class_instance *hwe)
> +{
> + uint32_t vm, exec_queue, bo, batch_bo, bind_engine;
> + uint64_t data_addr = PURGEABLE_ADDR;
> + uint64_t batch_addr = PURGEABLE_BATCH_ADDR;
> + size_t data_size = PURGEABLE_BO_SIZE;
> + size_t batch_size = PURGEABLE_BO_SIZE;
> + struct drm_xe_sync sync[2] = {
> + { .type = DRM_XE_SYNC_TYPE_USER_FENCE,
> + .flags = DRM_XE_SYNC_FLAG_SIGNAL,
> + .timeline_value = PURGEABLE_FENCE_VAL },
> + { .type = DRM_XE_SYNC_TYPE_SYNCOBJ,
> + .flags = DRM_XE_SYNC_FLAG_SIGNAL },
> + };
> + struct drm_xe_exec exec = {
> + .num_batch_buffer = 1,
> + .num_syncs = 2,
> + .syncs = to_user_pointer(sync),
> + };
> + uint32_t *data, *batch;
> + uint32_t syncobj;
> + int b, ret;
> +
> + purgeable_setup_batch_and_data(fd, &vm, &bind_engine, &batch_bo,
> + &bo, &batch, &data, batch_addr,
> + data_addr, batch_size, data_size);
> + memset(data, 0, data_size);
> +
> + syncobj = syncobj_create(fd, 0);
> +
> + /* Prepare batch to write to data BO */
> + b = 0;
> + batch[b++] = MI_STORE_DWORD_IMM_GEN4;
> + batch[b++] = data_addr;
> + batch[b++] = data_addr >> 32;
> + batch[b++] = 0xfeed0001;
> + batch[b++] = MI_BATCH_BUFFER_END;
> +
> + exec_queue = xe_exec_queue_create(fd, vm, hwe, 0);
> + exec.exec_queue_id = exec_queue;
> + exec.address = batch_addr;
> +
> + /* Use only syncobj for exec (not USER_FENCE) */
> + sync[0].type = DRM_XE_SYNC_TYPE_SYNCOBJ;
> + sync[0].flags = DRM_XE_SYNC_FLAG_SIGNAL;
> + sync[0].handle = syncobj;
> + exec.num_syncs = 1;
> + exec.syncs = to_user_pointer(&sync[0]);
> +
> + ret = __xe_exec(fd, &exec);
> + igt_assert_eq(ret, 0);
> +
> + igt_assert(syncobj_wait(fd, &syncobj, 1, INT64_MAX, 0, NULL));
> + munmap(data, data_size);
> + data = xe_bo_map(fd, bo, data_size);
> + igt_assert(data != MAP_FAILED);
> + igt_assert_eq(data[0], 0xfeed0001);
> +
> + if (!purgeable_mark_and_verify_purged(fd, vm, data_addr, data_size)) {
> + munmap(data, data_size);
> + munmap(batch, batch_size);
> + gem_close(fd, bo);
> + gem_close(fd, batch_bo);
> + syncobj_destroy(fd, syncobj);
> + xe_exec_queue_destroy(fd, bind_engine);
> + xe_exec_queue_destroy(fd, exec_queue);
> + xe_vm_destroy(fd, vm);
> + igt_skip("Unable to induce purge on this platform/config");
> + }
> +
> + /* Prepare second batch (different value) */
> + b = 0;
> + batch[b++] = MI_STORE_DWORD_IMM_GEN4;
> + batch[b++] = data_addr;
> + batch[b++] = data_addr >> 32;
> + batch[b++] = 0xfeed0002;
> + batch[b++] = MI_BATCH_BUFFER_END;
> +
> + /*
> + * Second exec with purged BO - may succeed (scratch rebind) or fail.
> + * Either is valid, so don't check results.
> + */
> + ret = __xe_exec(fd, &exec);
> + if (ret == 0)
> + syncobj_wait(fd, &syncobj, 1, INT64_MAX, 0, NULL);
> +
> + munmap(data, data_size);
> + munmap(batch, batch_size);
> + gem_close(fd, bo);
> + gem_close(fd, batch_bo);
> + syncobj_destroy(fd, syncobj);
> + xe_exec_queue_destroy(fd, bind_engine);
> + xe_exec_queue_destroy(fd, exec_queue);
> + xe_vm_destroy(fd, vm);
> +}
> +
> int igt_main()
> {
> struct drm_xe_engine_class_instance *hwe;
> @@ -480,6 +582,12 @@ int igt_main()
> break;
> }
>
> + igt_subtest("dontneed-after-exec")
> + xe_for_each_engine(fd, hwe) {
> + test_dontneed_after_exec(fd, hwe);
> + break;
> + }
> +
> igt_fixture() {
> xe_device_put(fd);
> drm_close_driver(fd);

LGTM:

Reviewed-by: Nishit Sharma <nishit.sharma@intel.com>