From patchwork Mon Aug 19 08:34:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 13768074 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 65C39C54722 for ; Mon, 19 Aug 2024 08:35:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C933910E1FE; Mon, 19 Aug 2024 08:35:15 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="geZ9080b"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id D622810E1FE; Mon, 19 Aug 2024 08:35:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724056512; x=1755592512; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=hr4iF3ejgvbaraReaQTKXIYPqicqSTkSR/bXb2WsSYw=; b=geZ9080b24wFXoizQ0AJDT/KvYo0til+ebYB/DJ+MXyLauYqltDr7+qL ZE67qn6JMC6wglZ3uaJZgdykYRua6Jc1/Bymg25aSRuTOWcGNC9VNwzlz HUDFIAxiykZfr1mzEdermC/KjBOES9hDN9r2d5s3slafmc8/bZfD+buaK Cf0b460PreY1n0floNKuYM5n2k4hxSk30SoKqTQdZ18X/BJMYW0xbyggu o7cSWbcOOmpVB8f3vBp4dfJZMY9hRD5CT/lAgRBA5ZQAif1p4YYjz1WO6 KP/t+p4540w+w7NPW2/bRXySWs7HScOfkVSBR3N4u8EhZfHpJA7DhiRpe w==; X-CSE-ConnectionGUID: IHOr/TNiQvavEWDmrFnyYw== X-CSE-MsgGUID: uK9q60EPQ62lNwgBCHlcfg== X-IronPort-AV: E=McAfee;i="6700,10204,11168"; a="32958477" X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="32958477" 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 01:35:12 -0700 X-CSE-ConnectionGUID: sHOrctzySya/JwyMC/u8yg== X-CSE-MsgGUID: tNGzBK44Q2qZ1ZKMIDt6zA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="59962267" 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 01:35:10 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-xe@lists.freedesktop.org Cc: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , =?utf-8?q?Christian_K=C3=B6nig?= , Somalapuram Amaranath , Matthew Brost , dri-devel@lists.freedesktop.org, Paulo Zanoni Subject: [PATCH v9 3/6] drm/ttm: Use fault-injection to test error paths Date: Mon, 19 Aug 2024 10:34:46 +0200 Message-ID: <20240819083449.56701-4-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" Use fault-injection to test partial TTM swapout and interrupted swapin. Return -EINTR for swapin to test the callers ability to handle and restart the swapin, and on swapout perform a partial swapout to test that the swapin and release_shrunken functionality. v8: - Use the core fault-injection system. v9: - Fix compliation failure for !CONFIG_FAULT_INJECTION Cc: Christian König Cc: Somalapuram Amaranath Cc: Matthew Brost Cc: Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost #v7 --- drivers/gpu/drm/ttm/ttm_pool.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index 0d224cd9f8eb..b2718aef2edf 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -48,6 +48,13 @@ #include "ttm_module.h" +#ifdef CONFIG_FAULT_INJECTION +#include +static DECLARE_FAULT_ATTR(backup_fault_inject); +#else +#define should_fail(...) false +#endif + /** * struct ttm_pool_dma - Helper object for coherent DMA mappings * @@ -431,6 +438,7 @@ static int ttm_pool_restore_tt(struct ttm_pool_tt_restore *restore, struct ttm_backup *backup, struct ttm_operation_ctx *ctx) { + static unsigned long __maybe_unused swappedin; unsigned int i, nr = 1 << restore->order; int ret = 0; @@ -446,6 +454,12 @@ static int ttm_pool_restore_tt(struct ttm_pool_tt_restore *restore, if (handle == 0) continue; + if (IS_ENABLED(CONFIG_FAULT_INJECTION) && ctx->interruptible && + should_fail(&backup_fault_inject, 1)) { + ret = -EINTR; + break; + } + ret = backup->ops->copy_backed_up_page (backup, restore->first_page[i], handle, ctx->interruptible); @@ -889,7 +903,14 @@ long ttm_pool_backup_tt(struct ttm_pool *pool, struct ttm_tt *ttm, alloc_gfp = GFP_KERNEL | __GFP_HIGH | __GFP_NOWARN | __GFP_RETRY_MAYFAIL; - for (i = 0; i < ttm->num_pages; ++i) { + num_pages = ttm->num_pages; + + /* Pretend doing fault injection by shrinking only half of the pages. */ + + if (IS_ENABLED(CONFIG_FAULT_INJECTION) && should_fail(&backup_fault_inject, 1)) + num_pages = DIV_ROUND_UP(num_pages, 2); + + for (i = 0; i < num_pages; ++i) { page = ttm->pages[i]; if (unlikely(!page)) continue; @@ -1178,6 +1199,10 @@ int ttm_pool_mgr_init(unsigned long num_pages) &ttm_pool_debugfs_globals_fops); debugfs_create_file("page_pool_shrink", 0400, ttm_debugfs_root, NULL, &ttm_pool_debugfs_shrink_fops); +#ifdef CONFIG_FAULT_INJECTION + fault_create_debugfs_attr("backup_fault_inject", ttm_debugfs_root, + &backup_fault_inject); +#endif #endif mm_shrinker = shrinker_alloc(0, "drm-ttm_pool");