From patchwork Mon Aug 19 08:34:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Hellstr=C3=B6m?= X-Patchwork-Id: 13768075 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 70334C5472C for ; Mon, 19 Aug 2024 08:35:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A64D510E201; Mon, 19 Aug 2024 08:35:16 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="STxuV7FE"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 11F3310E1FE; Mon, 19 Aug 2024 08:35:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724056514; x=1755592514; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TGZF/qxfwNIUwT6g6yBbTppuED0Uixq0VmCK9Zhau3s=; b=STxuV7FEdpLUWVmS29029+PGs6tapbKozq9/oLZ/9MM5bLqvezI7XJNO A7d+R0u6vBycLjnzV0fnQorLCId8L1tkgEWmFu5D9C3F7/YX0Y3b+ObsP Y82sBpoKfQEMKLM+om68ewgsFF1E9rF+bqk8bjKE5QdK7weiU6ZTLt6hW ueW2Pr4i3cJEApg48bynD00oYbTHMyjpTvO8Z07AbWUB3I2x84ZcQ2xTt BaT8IzpIkfChlM8my8P1BNp76EHKNG07nnoMSyfk6Z9f7ndVoVmiPOOFg F2DjnSe2W/sBT21mZbCcZVPjiupTueMV1HZZGdXOwJaK5XBWDhXKul047 w==; X-CSE-ConnectionGUID: T2O+uy/AQvamUEK40/lWbA== X-CSE-MsgGUID: qWEVfxqyRJeQuPhfsLaANw== X-IronPort-AV: E=McAfee;i="6700,10204,11168"; a="32958491" X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="32958491" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2024 01:35:14 -0700 X-CSE-ConnectionGUID: YOPXeawZSjiksxzjhRPNOw== X-CSE-MsgGUID: mOkEmyLURmKmEFqVDb1elQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="59962282" Received: from oandoniu-mobl3.ger.corp.intel.com (HELO fedora..) ([10.245.244.132]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2024 01:35:12 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-xe@lists.freedesktop.org Cc: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Matthew Brost , Somalapuram Amaranath , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Paulo Zanoni , dri-devel@lists.freedesktop.org Subject: [PATCH v9 4/6] drm/ttm: Add a shrinker helper and export the LRU walker for driver use Date: Mon, 19 Aug 2024 10:34:47 +0200 Message-ID: <20240819083449.56701-5-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240819083449.56701-1-thomas.hellstrom@linux.intel.com> References: <20240819083449.56701-1-thomas.hellstrom@linux.intel.com> MIME-Version: 1.0 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" Following the design direction communicated here: https://lore.kernel.org/linux-mm/b7491378-defd-4f1c-31e2-29e4c77e2d67@amd.com/T/#ma918844aa8a6efe8768fdcda0c6590d5c93850c9 Export the LRU walker for driver shrinker use and add a bo shrinker helper for initial use by the xe driver. v8: - Split out from another patch. - Use a struct for bool arguments to increase readability (Matt Brost). - Unmap user-space cpu-mappings before shrinking pages. - Explain non-fatal error codes (Matt Brost) Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost --- drivers/gpu/drm/ttm/ttm_bo_util.c | 65 +++++++++++++++++++++++++++++++ include/drm/ttm/ttm_bo.h | 17 ++++++++ 2 files changed, 82 insertions(+) diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 3c07f4712d5c..3490e3347de9 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -919,3 +919,68 @@ s64 ttm_lru_walk_for_evict(struct ttm_lru_walk *walk, struct ttm_device *bdev, return progress; } +EXPORT_SYMBOL(ttm_lru_walk_for_evict); + +/** + * ttm_bo_try_shrink - LRU walk helper to shrink a ttm buffer object. + * @walk: The struct xe_ttm_lru_walk that describes the walk. + * @bo: The buffer object. + * @flags: Flags governing the shrinking behaviour. + * + * The function uses the ttm_tt_back_up functionality to back up or + * purge a struct ttm_tt. If the bo is not in system, it's first + * moved there, unless @flags.allow_move is false. + * + * Return: The number of pages shrunken or purged, or + * negative error code on failure. + */ +long ttm_bo_try_shrink(struct ttm_lru_walk *walk, struct ttm_buffer_object *bo, + const struct ttm_bo_shrink_flags flags) +{ + static const struct ttm_place sys_placement_flags = { + .fpfn = 0, + .lpfn = 0, + .mem_type = TTM_PL_SYSTEM, + .flags = 0, + }; + static struct ttm_placement sys_placement = { + .num_placement = 1, + .placement = &sys_placement_flags, + }; + struct ttm_operation_ctx *ctx = walk->ctx; + struct ttm_tt *tt = bo->ttm; + long lret; + + dma_resv_assert_held(bo->base.resv); + + if (!tt || !ttm_tt_is_populated(tt)) + return 0; + + if (flags.allow_move && bo->resource->mem_type != TTM_PL_SYSTEM) { + int ret = ttm_bo_validate(bo, &sys_placement, ctx); + + /* Consider -ENOMEM and -ENOSPC non-fatal. */ + if (ret) { + if (ret == -ENOMEM || ret == -ENOSPC) + ret = -EBUSY; + return ret; + } + } + + ttm_bo_unmap_virtual(bo); + lret = ttm_bo_wait_ctx(bo, ctx); + if (lret < 0) { + if (lret == -ERESTARTSYS) + return lret; + return 0; + } + + lret = ttm_tt_backup(bo->bdev, tt, (struct ttm_backup_flags) + {.purge = flags.purge, + .writeback = flags.writeback}); + if (lret < 0 && lret != -EINTR) + return 0; + + return lret; +} +EXPORT_SYMBOL(ttm_bo_try_shrink); diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h index d1a732d56259..479ada85cea1 100644 --- a/include/drm/ttm/ttm_bo.h +++ b/include/drm/ttm/ttm_bo.h @@ -229,6 +229,23 @@ struct ttm_lru_walk { s64 ttm_lru_walk_for_evict(struct ttm_lru_walk *walk, struct ttm_device *bdev, struct ttm_resource_manager *man, s64 target); +/** + * struct ttm_bo_shrink_flags - flags to govern the bo shrinking behaviour + * @purge: Purge the content rather than backing it up. + * @writeback: Attempt to immediately write content to swap space. + * @allow_move: Allow moving to system before shrinking. This is typically + * not desired for zombie- or ghost objects (with zombie object meaning + * objects with a zero gem object refcount) + */ +struct ttm_bo_shrink_flags { + u32 purge : 1; + u32 writeback : 1; + u32 allow_move : 1; +}; + +long ttm_bo_try_shrink(struct ttm_lru_walk *walk, struct ttm_buffer_object *bo, + const struct ttm_bo_shrink_flags flags); + /** * ttm_bo_get - reference a struct ttm_buffer_object *