From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 10D3EE8384D for ; Tue, 17 Feb 2026 02:35:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A73E910E422; Tue, 17 Feb 2026 02:35:50 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="UxBh2tii"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4E29C10E15A for ; Tue, 17 Feb 2026 02:35:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1771295748; x=1802831748; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7XavFGUsepuJ5HodPegiY3re+pvLNsNXpQNvkPenEo4=; b=UxBh2tiioBUBepD7PlPuzEoi/jKDUWvalGKJuQ9y7NT47EBTUaXdGIv2 dwI0alZOFUCevxe+V/MzLz8W/xsdEZM5/FgvBNebeyTtiJiReb9pjKPhL zKHIB2Hfn6vkhjVix1V3Q+bBx5BNl95Qb8IUKE+y2SzOpj4YxzWSHaAA4 +FSdd01eithns+kLb78tcx4EqJlKJH4qhZhLZRWaOv1GYPcWWtNo6ccT0 0ABR4JmEZ0tByIL7JPgd8ryFbvxFsR37WoOvEIwsYn9AMP4scfs3VXF5U gqJetd0Ye+F9dRKLxqwydgpYf43hkofQlJsxUkYkKK/acyl4Zkrm5QNIi Q==; X-CSE-ConnectionGUID: oCDfefKgSFab/OUyv+GvoQ== X-CSE-MsgGUID: knXIQU6vS6SIuzkhil4sMA== X-IronPort-AV: E=McAfee;i="6800,10657,11703"; a="72358375" X-IronPort-AV: E=Sophos;i="6.21,295,1763452800"; d="scan'208";a="72358375" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2026 18:35:47 -0800 X-CSE-ConnectionGUID: jDTm/xzDTHCXjoAvo6Jozw== X-CSE-MsgGUID: 01ES9M1QQtOSfJLdPStPfQ== X-ExtLoop1: 1 Received: from varungup-desk.iind.intel.com ([10.190.238.71]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2026 18:34:39 -0800 From: Arvind Yadav To: igt-dev@lists.freedesktop.org Cc: matthew.brost@intel.com, himal.prasad.ghimiray@intel.com, thomas.hellstrom@linux.intel.com, nishit.sharma@intel.com, pravalika.gurram@intel.com Subject: [PATCH i-g-t v3 3/8] tests/intel/xe_madvise: Add dontneed-before-mmap subtest Date: Tue, 17 Feb 2026 08:04:14 +0530 Message-ID: <20260217023423.2632617-4-arvind.yadav@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260217023423.2632617-1-arvind.yadav@intel.com> References: <20260217023423.2632617-1-arvind.yadav@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: igt-dev@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development mailing list for IGT GPU Tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" This test validates kernel behavior when mapping a BO that was already marked as purgeable and purged before mmap. After purging the BO under memory pressure, the test attempts to mmap and access it. The kernel should trigger SIGBUS or SIGSEGV when accessing the purged mapping, confirming that purged memory is properly invalidated. Cc: Nishit Sharma Cc: Pravalika Gurram Cc: Matthew Brost Cc: Thomas Hellström Cc: Himal Prasad Ghimiray Signed-off-by: Arvind Yadav --- tests/intel/xe_madvise.c | 219 +++++++++++++++++++++++++++++++++++++++ tests/meson.build | 1 + 2 files changed, 220 insertions(+) create mode 100644 tests/intel/xe_madvise.c diff --git a/tests/intel/xe_madvise.c b/tests/intel/xe_madvise.c new file mode 100644 index 000000000..7dbe70f42 --- /dev/null +++ b/tests/intel/xe_madvise.c @@ -0,0 +1,219 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2025 Intel Corporation + */ + +/** + * TEST: Validate purgeable BO madvise functionality + * Category: Core + * Mega feature: General Core features + * Sub-category: Memory management tests + * Functionality: madvise, purgeable + */ + +#include "igt.h" +#include "xe_drm.h" + +#include "xe/xe_ioctl.h" +#include "xe/xe_query.h" + +/* Purgeable test constants */ +#define PURGEABLE_ADDR 0x1a0000 +#define PURGEABLE_BO_SIZE 4096 + +/** + * trigger_memory_pressure - Fill VRAM + 25% to force purgeable reclaim + * @fd: DRM file descriptor + * @vm: VM handle (unused, kept for API compatibility) + * + * Allocates BOs in a temporary VM until VRAM is overcommitted, + * forcing the kernel to purge DONTNEED-marked BOs. + */ +static void trigger_memory_pressure(int fd, uint32_t vm) +{ + uint64_t vram_size, overpressure; + const uint64_t chunk = 8ull << 20; /* 8 MiB */ + int max_objs, n = 0; + uint32_t *handles; + uint64_t total; + void *p; + uint32_t handle, temp_vm; + + /* Use a separate VM so pressure BOs don't affect the test VM */ + temp_vm = xe_vm_create(fd, 0, 0); + + vram_size = xe_visible_vram_size(fd, 0); + /* Scale overpressure to 25% of VRAM, minimum 64MB */ + overpressure = vram_size / 4; + if (overpressure < (64 << 20)) + overpressure = 64 << 20; + + max_objs = (vram_size + overpressure) / chunk + 1; + handles = malloc(max_objs * sizeof(*handles)); + igt_assert(handles); + + total = 0; + while (total < vram_size + overpressure && n < max_objs) { + handle = xe_bo_create(fd, temp_vm, chunk, + vram_if_possible(fd, 0), + DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM); + handles[n++] = handle; + total += chunk; + + p = xe_bo_map(fd, handle, chunk); + igt_assert(p != MAP_FAILED); + + /* Fault in all pages so they actually consume VRAM */ + memset(p, 0xCD, chunk); + munmap(p, chunk); + } + + /* Allow shrinker time to process pressure */ + usleep(100000); + + for (int i = 0; i < n; i++) + gem_close(fd, handles[i]); + + free(handles); + + xe_vm_destroy(fd, temp_vm); +} + +static jmp_buf jmp; + +__noreturn static void sigtrap(int sig) +{ + siglongjmp(jmp, sig); +} + +/** + * purgeable_mark_and_verify_purged - Mark DONTNEED, pressure, check purged + * @fd: DRM file descriptor + * @vm: VM handle + * @addr: Virtual address of the BO + * @size: Size of the BO + * + * Returns true if the BO was purged under memory pressure. + */ +static bool purgeable_mark_and_verify_purged(int fd, uint32_t vm, uint64_t addr, size_t size) +{ + uint32_t retained; + + /* Mark as DONTNEED */ + retained = xe_vm_madvise_purgeable(fd, vm, addr, size, + DRM_XE_VMA_PURGEABLE_STATE_DONTNEED); + if (retained != 1) + return false; + + /* Trigger memory pressure */ + trigger_memory_pressure(fd, vm); + + /* Verify purged */ + retained = xe_vm_madvise_purgeable(fd, vm, addr, size, + DRM_XE_VMA_PURGEABLE_STATE_WILLNEED); + return retained == 0; +} + +/** + * purgeable_setup_simple_bo - Setup VM and bind a single BO + * @fd: DRM file descriptor + * @vm: Output VM handle + * @bo: Output BO handle + * @addr: Virtual address to bind at + * @size: Size of the BO + * @use_scratch: Whether to use scratch page flag + * + * Helper to create VM, BO, and bind it at the specified address. + */ +static void purgeable_setup_simple_bo(int fd, uint32_t *vm, uint32_t *bo, + uint64_t addr, size_t size, bool use_scratch) +{ + struct drm_xe_sync sync = { + .type = DRM_XE_SYNC_TYPE_USER_FENCE, + .flags = DRM_XE_SYNC_FLAG_SIGNAL, + .timeline_value = 1, + }; + uint64_t sync_val = 0; + + *vm = xe_vm_create(fd, use_scratch ? DRM_XE_VM_CREATE_FLAG_SCRATCH_PAGE : 0, 0); + *bo = xe_bo_create(fd, *vm, size, vram_if_possible(fd, 0), + DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM); + + sync.addr = to_user_pointer(&sync_val); + xe_vm_bind_async(fd, *vm, 0, *bo, 0, addr, size, &sync, 1); + xe_wait_ufence(fd, &sync_val, 1, 0, NSEC_PER_SEC); +} + +/** + * SUBTEST: dontneed-before-mmap + * Description: Mark BO as DONTNEED before mmap, verify mmap fails or SIGBUS on access + * Test category: functionality test + */ +static void test_dontneed_before_mmap(int fd, struct drm_xe_engine_class_instance *hwe) +{ + uint32_t bo, vm; + uint64_t addr = PURGEABLE_ADDR; + size_t bo_size = PURGEABLE_BO_SIZE; + void *map; + + purgeable_setup_simple_bo(fd, &vm, &bo, addr, bo_size, false); + if (!purgeable_mark_and_verify_purged(fd, vm, addr, bo_size)) + igt_skip("Unable to induce purge on this platform/config"); + + /* mmap the purged BO - access should trigger SIGBUS */ + map = xe_bo_map(fd, bo, bo_size); + + { + sighandler_t old_sigsegv, old_sigbus; + char *ptr = (char *)map; + int sig; + + old_sigsegv = signal(SIGSEGV, (__sighandler_t)sigtrap); + old_sigbus = signal(SIGBUS, (__sighandler_t)sigtrap); + + sig = sigsetjmp(jmp, SIGBUS | SIGSEGV); + switch (sig) { + case SIGBUS: + case SIGSEGV: + /* Expected - purged BO access failed */ + break; + case 0: + *ptr = 0; + __attribute__ ((fallthrough)); + default: + igt_assert_f(false, + "Access to purged mmap should trigger SIGBUS, got sig=%d\n", + sig); + break; + } + + signal(SIGBUS, old_sigbus); + signal(SIGSEGV, old_sigsegv); + munmap(map, bo_size); + } + + gem_close(fd, bo); + xe_vm_destroy(fd, vm); +} + +int igt_main() +{ + struct drm_xe_engine_class_instance *hwe; + int fd; + + igt_fixture() { + fd = drm_open_driver(DRIVER_XE); + xe_device_get(fd); + } + + igt_subtest("dontneed-before-mmap") + xe_for_each_engine(fd, hwe) { + test_dontneed_before_mmap(fd, hwe); + break; + } + + igt_fixture() { + xe_device_put(fd); + drm_close_driver(fd); + } +} diff --git a/tests/meson.build b/tests/meson.build index 0ad728b87..9d41d7de6 100644 --- a/tests/meson.build +++ b/tests/meson.build @@ -313,6 +313,7 @@ intel_xe_progs = [ 'xe_huc_copy', 'xe_intel_bb', 'xe_live_ktest', + 'xe_madvise', 'xe_media_fill', 'xe_mmap', 'xe_module_load', -- 2.43.0