From patchwork Mon Feb 29 21:16:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dave Gordon X-Patchwork-Id: 8458281 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 75683C0553 for ; Mon, 29 Feb 2016 21:16:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 716B6201F2 for ; Mon, 29 Feb 2016 21:16:51 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 71C6A201C8 for ; Mon, 29 Feb 2016 21:16:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3B9126E37D; Mon, 29 Feb 2016 21:16:47 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 5E3A86E37D; Mon, 29 Feb 2016 21:16:44 +0000 (UTC) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 29 Feb 2016 13:16:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,521,1449561600"; d="scan'208";a="923744020" Received: from dsgordon-linux2.isw.intel.com ([10.102.226.88]) by orsmga002.jf.intel.com with ESMTP; 29 Feb 2016 13:16:43 -0800 From: Dave Gordon To: intel-gfx@lists.freedesktop.org Subject: [PATCH v6 2/7] drm: add parameter-order checking to drm memory allocators Date: Mon, 29 Feb 2016 21:16:07 +0000 Message-Id: <1456780572-19196-3-git-send-email-david.s.gordon@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1456780572-19196-1-git-send-email-david.s.gordon@intel.com> References: <1456780572-19196-1-git-send-email-david.s.gordon@intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Cc: Dave Gordon , dri-devel@lists.freedesktop.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 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" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP After the recent addition of drm_malloc_gfp(), it was noticed that some callers of these functions has swapped the parameters in the call - it's supposed to be 'number of members' and 'sizeof(element)', but a few callers had got the size first and the count second. This isn't otherwise detected because they're both type 'size_t', and the implementation at present just multiplies them anyway, so the result is still right. But some future implementation might treat them differently (e.g. allowing 0 elements but not zero size), so let's add some compile-time checks and complain if the second (size) parameter isn't a sizeof() expression, or at least a compile-time constant. This patch also fixes those callers where the order was wrong. v6: removed duplicate BUILD_BUG_ON_MSG(); avoided renaming functions by shadowing them with #defines and then calling the function (non-recursively!) from inside the #define [Chris Wilson] Signed-off-by: Dave Gordon Cc: Chris Wilson Cc: Ville Syrjälä Cc: dri- Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 2 +- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 8 ++++---- include/drm/drm_mem_util.h | 27 ++++++++++++++++++++++++--- 3 files changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c index 1aba01a..9ae4a71 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c @@ -340,7 +340,7 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data, */ bos = drm_malloc_ab(args->nr_bos, sizeof(*bos)); relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs)); - stream = drm_malloc_ab(1, args->stream_size); + stream = drm_malloc_ab(args->stream_size, sizeof(*stream)); cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8, args->nr_bos); if (!bos || !relocs || !stream || !cmdbuf) { diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index f734b3c..1a136d9 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1686,8 +1686,8 @@ static bool only_mappable_for_reloc(unsigned int flags) } /* Copy in the exec list from userland */ - exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count); - exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count); + exec_list = drm_malloc_ab(args->buffer_count, sizeof(*exec_list)); + exec2_list = drm_malloc_ab(args->buffer_count, sizeof(*exec2_list)); if (exec_list == NULL || exec2_list == NULL) { DRM_DEBUG("Failed to allocate exec list for %d buffers\n", args->buffer_count); @@ -1775,8 +1775,8 @@ static bool only_mappable_for_reloc(unsigned int flags) return -EINVAL; } - exec2_list = drm_malloc_gfp(sizeof(*exec2_list), - args->buffer_count, + exec2_list = drm_malloc_gfp(args->buffer_count, + sizeof(*exec2_list), GFP_TEMPORARY); if (exec2_list == NULL) { DRM_DEBUG("Failed to allocate exec list for %d buffers\n", diff --git a/include/drm/drm_mem_util.h b/include/drm/drm_mem_util.h index 741ce75..5b0111c 100644 --- a/include/drm/drm_mem_util.h +++ b/include/drm/drm_mem_util.h @@ -29,7 +29,7 @@ #include -static __inline__ void *drm_calloc_large(size_t nmemb, size_t size) +static __inline__ void *drm_calloc_large(size_t nmemb, const size_t size) { if (size != 0 && nmemb > SIZE_MAX / size) return NULL; @@ -41,8 +41,15 @@ static __inline__ void *drm_calloc_large(size_t nmemb, size_t size) GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); } +#define drm_calloc_large(nmemb, size) \ +({ \ + BUILD_BUG_ON_MSG(!__builtin_constant_p(size), \ + "Non-constant 'size' - check argument ordering?"); \ + (drm_calloc_large)(nmemb, size); \ +}) + /* Modeled after cairo's malloc_ab, it's like calloc but without the zeroing. */ -static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size) +static __inline__ void *drm_malloc_ab(size_t nmemb, const size_t size) { if (size != 0 && nmemb > SIZE_MAX / size) return NULL; @@ -54,7 +61,14 @@ static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size) GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); } -static __inline__ void *drm_malloc_gfp(size_t nmemb, size_t size, gfp_t gfp) +#define drm_malloc_ab(nmemb, size) \ +({ \ + BUILD_BUG_ON_MSG(!__builtin_constant_p(size), \ + "Non-constant 'size' - check argument ordering?"); \ + (drm_malloc_ab)(nmemb, size); \ +}) + +static __inline__ void *drm_malloc_gfp(size_t nmemb, const size_t size, gfp_t gfp) { if (size != 0 && nmemb > SIZE_MAX / size) return NULL; @@ -73,6 +87,13 @@ static __inline__ void *drm_malloc_gfp(size_t nmemb, size_t size, gfp_t gfp) gfp | __GFP_HIGHMEM, PAGE_KERNEL); } +#define drm_malloc_gfp(nmemb, size, gfp) \ +({ \ + BUILD_BUG_ON_MSG(!__builtin_constant_p(size), \ + "Non-constant 'size' - check argument ordering?"); \ + (drm_malloc_gfp)(nmemb, size, gfp); \ +}) + static __inline void drm_free_large(void *ptr) { kvfree(ptr);