From patchwork Mon Feb 21 12:11:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matthew Auld X-Patchwork-Id: 12753535 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 F2ACFC433EF for ; Mon, 21 Feb 2022 12:11:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 53EBF10E319; Mon, 21 Feb 2022 12:11:18 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 40D9510E319; Mon, 21 Feb 2022 12:11:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645445477; x=1676981477; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=WuuxcEgNUssxUyppX8vjuZ2LlUrVbih3sy4lyc9P8xs=; b=cZl81DOLeFQGIXMWuTd6mYltGuJMPq2jC3F2o7sxup59+jSFzPcC9beF +xnc0H187xtRoKwwMR/C6cH5q1hHrLVNjgXvtKQK0f5ipUtL+uqmydfXa ZA1Jvka1gAuxxToGSFhDkixIGVDetHCOD+WxK1UDXgblRdwVN+KtZFbLE 2QcqYbnNAehfjoBy0DlR76w0J7CukGVTnftwai8SyThjrRGr01F8vt0Ib WEISwr0kos8saEVDS3A+14QC5i/P3f4MuZnrvoAjpr74j1midYwXOhNCy MBpvvxcFUl4FkkAd3YtPej4WFTdJucBVO9gF+B9CfnBq93YKe7XTtPSsn g==; X-IronPort-AV: E=McAfee;i="6200,9189,10264"; a="232117941" X-IronPort-AV: E=Sophos;i="5.88,385,1635231600"; d="scan'208";a="232117941" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Feb 2022 04:11:16 -0800 X-IronPort-AV: E=Sophos;i="5.88,385,1635231600"; d="scan'208";a="507615498" Received: from joeyegax-mobl.ger.corp.intel.com (HELO mwauld-desk1.intel.com) ([10.252.23.97]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Feb 2022 04:11:15 -0800 From: Matthew Auld To: intel-gfx@lists.freedesktop.org Date: Mon, 21 Feb 2022 12:11:03 +0000 Message-Id: <20220221121103.2473831-1-matthew.auld@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2] drm/i915/ttm: fixup the mock_bo X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , =?utf-8?q?Christian_K=C3=B6nig?= , dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" When running the mock selftests we currently blow up with: <6> [299.836278] i915: Running i915_gem_huge_page_mock_selftests/igt_mock_memory_region_huge_pages <1> [299.836356] BUG: kernel NULL pointer dereference, address: 00000000000000c8 <1> [299.836361] #PF: supervisor read access in kernel mode <1> [299.836364] #PF: error_code(0x0000) - not-present page <6> [299.836367] PGD 0 P4D 0 <4> [299.836369] Oops: 0000 [#1] PREEMPT SMP NOPTI <4> [299.836372] CPU: 1 PID: 1429 Comm: i915_selftest Tainted: G U 5.17.0-rc4-CI-CI_DRM_11227+ #1 <4> [299.836376] Hardware name: Intel(R) Client Systems NUC11TNHi5/NUC11TNBi5, BIOS TNTGL357.0042.2020.1221.1743 12/21/2020 <4> [299.836380] RIP: 0010:ttm_resource_init+0x57/0x90 [ttm] <4> [299.836392] RSP: 0018:ffffc90001e4f680 EFLAGS: 00010203 <4> [299.836395] RAX: 0000000000000000 RBX: ffffc90001e4f708 RCX: 0000000000000000 <4> [299.836398] RDX: ffff888116172528 RSI: ffffc90001e4f6f8 RDI: 0000000000000000 <4> [299.836401] RBP: ffffc90001e4f6f8 R08: 00000000000001b0 R09: ffff888116172528 <4> [299.836403] R10: 0000000000000001 R11: 00000000a4cb2e51 R12: ffffc90001e4fa90 <4> [299.836406] R13: ffff888116172528 R14: ffff888130d7f4b0 R15: ffff888130d7f400 <4> [299.836409] FS: 00007ff241684500(0000) GS:ffff88849fe80000(0000) knlGS:0000000000000000 <4> [299.836412] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4> [299.836416] CR2: 00000000000000c8 CR3: 0000000107b80001 CR4: 0000000000770ee0 <4> [299.836418] PKRU: 55555554 <4> [299.836420] Call Trace: <4> [299.836422] <4> [299.836423] i915_ttm_buddy_man_alloc+0x68/0x240 [i915] ttm_resource_init() now needs to access the bo->bdev, and also wants to store the bo reference. Try to keep both working. The mock_bo is a hack so we can interface directly with the ttm managers alloc() and free() hooks for our mock testing, without invoking other TTM features like eviction, moves, etc. v2: make sure we only touch res->bo if the alloc() returns successfully Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5123 Fixes: 0e05fc49c358 ("drm/ttm: add common accounting to the resource mgr v3") Signed-off-by: Matthew Auld Cc: Christian König Cc: Thomas Hellström Acked-by: Christian König Reviewed-by: Thomas Hellström --- drivers/gpu/drm/i915/intel_region_ttm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c index f2b888c16958..7dea07c579aa 100644 --- a/drivers/gpu/drm/i915/intel_region_ttm.c +++ b/drivers/gpu/drm/i915/intel_region_ttm.c @@ -200,11 +200,14 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem, int ret; mock_bo.base.size = size; + mock_bo.bdev = &mem->i915->bdev; place.flags = flags; ret = man->func->alloc(man, &mock_bo, &place, &res); if (ret == -ENOSPC) ret = -ENXIO; + if (!ret) + res->bo = NULL; /* Rather blow up, then some uaf */ return ret ? ERR_PTR(ret) : res; } @@ -219,6 +222,11 @@ void intel_region_ttm_resource_free(struct intel_memory_region *mem, struct ttm_resource *res) { struct ttm_resource_manager *man = mem->region_private; + struct ttm_buffer_object mock_bo = {}; + + mock_bo.base.size = res->num_pages << PAGE_SHIFT; + mock_bo.bdev = &mem->i915->bdev; + res->bo = &mock_bo; man->func->free(man, res); }