From patchwork Mon Jul 1 15:17:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nirmoy Das X-Patchwork-Id: 13718321 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 95973C3065F for ; Mon, 1 Jul 2024 15:32:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0422910E471; Mon, 1 Jul 2024 15:32:50 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="dHD98ZVA"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0410210E46D; Mon, 1 Jul 2024 15:32:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1719847969; x=1751383969; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xVL+wcmayVrZfgSrFL0JdS8HmgNZ5w1ywa4tgvPa3qM=; b=dHD98ZVABCys+Bzx8emK6PA+Qk2mHIVDbS3uXcbwvps0Tq/2ulY/1Kx7 5QU8puf8yhQ81yED9NgV/w7whZ/5T/osZFKkUOM1u3w3HQKKDvW3FuABa K33yKB/50qsadMZ4woLEvMkAiugOAijVrTm7xmgKc2isGa+3RYvV49fSS /Yu5LlDJ1VgMotgc1/nIw2jz9fZWmUtCQEXjd91bWy7S2JFn7IF0IuNQr phgPobXR8DYR04EemXmsoZdYf6qfKadyeEFkLZt5d25U/MhV7Hg0F7XlE 0pPaLDBSlZPNm4O8ONOH4eEiGCFPSN8LqLycqQ2WWsM0O3rG6FgmwwqTD A==; X-CSE-ConnectionGUID: mhf0SutgRgyZwoHv9As41Q== X-CSE-MsgGUID: gt4dCvB9SK6RksIaQWbqqQ== X-IronPort-AV: E=McAfee;i="6700,10204,11120"; a="34527125" X-IronPort-AV: E=Sophos;i="6.09,176,1716274800"; d="scan'208";a="34527125" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2024 08:32:48 -0700 X-CSE-ConnectionGUID: j239LkcRSf2xdjEYXEUpqw== X-CSE-MsgGUID: HVgVCdPKTtaSUWVVdBCSgA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,176,1716274800"; d="scan'208";a="49912463" Received: from nirmoyda-desk.igk.intel.com ([10.102.138.190]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2024 08:32:46 -0700 From: Nirmoy Das To: dri-devel@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, Nirmoy Das , Himal Prasad Ghimiray , Matthew Auld , =?utf-8?q?Thomas_Hellstr=C3=B6m?= Subject: [PATCH v4 4/4] drm/xe/lnl: Offload system clear page activity to GPU Date: Mon, 1 Jul 2024 17:17:38 +0200 Message-ID: <20240701151738.6749-4-nirmoy.das@intel.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240701151738.6749-1-nirmoy.das@intel.com> References: <20240701151738.6749-1-nirmoy.das@intel.com> MIME-Version: 1.0 Organization: Intel Deutschland GmbH, Registered Address: Am Campeon 10, 85579 Neubiberg, Germany, Commercial Register: Amtsgericht Muenchen HRB 186928 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On LNL because of flat CCS, driver creates a migrate job to clear CCS meta data. Extend that to also clear system pages using GPU. Inform TTM to allocate pages without __GFP_ZERO to avoid double page clearing by clearing out TTM_TT_FLAG_ZERO_ALLOC flag and set TTM_TT_FLAG_CLEARED_ON_FREE while freeing to skip ttm pool's clearn-on-free as XE now takes care of clearing pages. If a bo is in system placement and there is a cpu map then for such BO gpu clear will be avoided as there is no dma mapping for such BO. To test the patch, created a small test that tries to submit a job after binding various sizes of buffer which shows good gains for larger buffer. For lower buffer sizes, the result is not very reliable as the results vary a lot. With the patch sudo ~/igt-gpu-tools/build/tests/xe_exec_store --run basic-store-benchmark IGT-Version: 1.28-g2ed908c0b (x86_64) (Linux: 6.10.0-rc2-xe+ x86_64) Using IGT_SRANDOM=1719237905 for randomisation Opened device: /dev/dri/card0 Starting subtest: basic-store-benchmark Starting dynamic subtest: WC Dynamic subtest WC: SUCCESS (0.000s) Time taken for size SZ_4K: 9493 us Time taken for size SZ_2M: 5503 us Time taken for size SZ_64M: 13016 us Time taken for size SZ_128M: 29464 us Time taken for size SZ_256M: 38408 us Time taken for size SZ_1G: 148758 us Starting dynamic subtest: WB Dynamic subtest WB: SUCCESS (0.000s) Time taken for size SZ_4K: 3889 us Time taken for size SZ_2M: 6091 us Time taken for size SZ_64M: 20920 us Time taken for size SZ_128M: 32394 us Time taken for size SZ_256M: 61710 us Time taken for size SZ_1G: 215437 us Subtest basic-store-benchmark: SUCCESS (0.589s) With the patch: sudo ~/igt-gpu-tools/build/tests/xe_exec_store --run basic-store-benchmark IGT-Version: 1.28-g2ed908c0b (x86_64) (Linux: 6.10.0-rc2-xe+ x86_64) Using IGT_SRANDOM=1719238062 for randomisation Opened device: /dev/dri/card0 Starting subtest: basic-store-benchmark Starting dynamic subtest: WC Dynamic subtest WC: SUCCESS (0.000s) Time taken for size SZ_4K: 11803 us Time taken for size SZ_2M: 4237 us Time taken for size SZ_64M: 8649 us Time taken for size SZ_128M: 14682 us Time taken for size SZ_256M: 22156 us Time taken for size SZ_1G: 74457 us Starting dynamic subtest: WB Dynamic subtest WB: SUCCESS (0.000s) Time taken for size SZ_4K: 5129 us Time taken for size SZ_2M: 12563 us Time taken for size SZ_64M: 14860 us Time taken for size SZ_128M: 26064 us Time taken for size SZ_256M: 47167 us Time taken for size SZ_1G: 170304 us Subtest basic-store-benchmark: SUCCESS (0.417s) With the patch and init_on_alloc=0 sudo ~/igt-gpu-tools/build/tests/xe_exec_store --run basic-store-benchmark IGT-Version: 1.28-g2ed908c0b (x86_64) (Linux: 6.10.0-rc2-xe+ x86_64) Using IGT_SRANDOM=1719238219 for randomisation Opened device: /dev/dri/card0 Starting subtest: basic-store-benchmark Starting dynamic subtest: WC Dynamic subtest WC: SUCCESS (0.000s) Time taken for size SZ_4K: 4803 us Time taken for size SZ_2M: 9212 us Time taken for size SZ_64M: 9643 us Time taken for size SZ_128M: 13479 us Time taken for size SZ_256M: 22429 us Time taken for size SZ_1G: 83110 us Starting dynamic subtest: WB Dynamic subtest WB: SUCCESS (0.000s) Time taken for size SZ_4K: 4003 us Time taken for size SZ_2M: 4443 us Time taken for size SZ_64M: 12960 us Time taken for size SZ_128M: 13741 us Time taken for size SZ_256M: 26841 us Time taken for size SZ_1G: 84746 us Subtest basic-store-benchmark: SUCCESS (0.290s) v2: Handle regression on dgfx(Himal) Update commit message as no ttm API changes needed. v3: Fix Kunit test. v4: handle data leak on cpu mmap(Thomas) Cc: Himal Prasad Ghimiray Cc: Matthew Auld Cc: "Thomas Hellström" Signed-off-by: Nirmoy Das --- drivers/gpu/drm/xe/xe_bo.c | 25 ++++++++++++++++++++++++- drivers/gpu/drm/xe/xe_device.c | 7 +++++++ drivers/gpu/drm/xe/xe_device_types.h | 2 ++ 3 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c index 4d6315d2ae9a..b76a44fcf3b1 100644 --- a/drivers/gpu/drm/xe/xe_bo.c +++ b/drivers/gpu/drm/xe/xe_bo.c @@ -387,6 +387,13 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo, caching = ttm_uncached; } + /* If the device can support gpu clear pages then set proper ttm + * flag. Zeroed pages are only required for ttm_bo_type_device so + * unwanted data is leaked to userspace. + */ + if (ttm_bo->type == ttm_bo_type_device && xe->mem.gpu_page_clear) + page_flags |= TTM_TT_FLAG_CLEARED_ON_FREE; + err = ttm_tt_init(&tt->ttm, &bo->ttm, page_flags, caching, extra_pages); if (err) { kfree(tt); @@ -408,6 +415,10 @@ static int xe_ttm_tt_populate(struct ttm_device *ttm_dev, struct ttm_tt *tt, if (tt->page_flags & TTM_TT_FLAG_EXTERNAL) return 0; + /* Clear TTM_TT_FLAG_ZERO_ALLOC when GPU is set to clear pages */ + if (tt->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE) + tt->page_flags &= ~TTM_TT_FLAG_ZERO_ALLOC; + err = ttm_pool_alloc(&ttm_dev->pool, tt, ctx); if (err) return err; @@ -653,6 +664,14 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, int ret = 0; + /* + * Clear TTM_TT_FLAG_CLEARED_ON_FREE on bo creation path when + * moving to system as the bo doesn't dma_mapping. + */ + if (!old_mem && ttm && !ttm_tt_is_populated(ttm)) { + ttm->page_flags &= ~TTM_TT_FLAG_CLEARED_ON_FREE; + } + /* Bo creation path, moving to system or TT. */ if ((!old_mem && ttm) && !handle_system_ccs) { if (new_mem->mem_type == XE_PL_TT) @@ -676,7 +695,8 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, (!mem_type_is_vram(old_mem_type) && !tt_has_data); needs_clear = (ttm && ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC) || - (!ttm && ttm_bo->type == ttm_bo_type_device); + (!ttm && ttm_bo->type == ttm_bo_type_device) || + (ttm && ttm->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE); if (new_mem->mem_type == XE_PL_TT) { ret = xe_tt_map_sg(ttm); @@ -790,6 +810,9 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, handle_system_ccs; bool clear_bo_data = mem_type_is_vram(new_mem->mem_type); + if (ttm && (ttm->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE)) + clear_bo_data |= true; + fence = xe_migrate_clear(migrate, bo, new_mem, clear_bo_data, clear_ccs); } diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c index cfda7cb5df2c..293579e35c2e 100644 --- a/drivers/gpu/drm/xe/xe_device.c +++ b/drivers/gpu/drm/xe/xe_device.c @@ -636,6 +636,13 @@ int xe_device_probe(struct xe_device *xe) if (err) goto err; + /** + * On iGFX device with flat CCS, we clear CCS metadata, let's extend that + * and use GPU to clear pages as well. + */ + if (xe_device_has_flat_ccs(xe) && !IS_DGFX(xe)) + xe->mem.gpu_page_clear = true; + err = xe_vram_probe(xe); if (err) goto err; diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h index c37be471d11c..ece68c6f3668 100644 --- a/drivers/gpu/drm/xe/xe_device_types.h +++ b/drivers/gpu/drm/xe/xe_device_types.h @@ -325,6 +325,8 @@ struct xe_device { struct xe_mem_region vram; /** @mem.sys_mgr: system TTM manager */ struct ttm_resource_manager sys_mgr; + /** @gpu_page_clear: clear pages offloaded to GPU */ + bool gpu_page_clear; } mem; /** @sriov: device level virtualization data */