From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id A07906E0A5 for ; Fri, 8 Oct 2021 06:54:49 +0000 (UTC) From: =?UTF-8?q?Zbigniew=20Kempczy=C5=84ski?= Date: Fri, 8 Oct 2021 08:54:26 +0200 Message-Id: <20211008065432.15482-2-zbigniew.kempczynski@intel.com> In-Reply-To: <20211008065432.15482-1-zbigniew.kempczynski@intel.com> References: <20211008065432.15482-1-zbigniew.kempczynski@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Subject: [igt-dev] [PATCH i-g-t 1/7] lib/gem_submission: Add kernel exec object alignment capability List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" To: igt-dev@lists.freedesktop.org Cc: =?UTF-8?q?Zbigniew=20Kempczy=C5=84ski?= , Petri Latvala , Ashutosh Dixit List-ID: With newer gens passing non-zero alignment will be forbidden. Add check which detects kernel supports it or not. Signed-off-by: Zbigniew Kempczyński Cc: Petri Latvala Cc: Ashutosh Dixit --- lib/i915/gem_submission.c | 32 ++++++++++++++++++++++++++++++++ lib/i915/gem_submission.h | 1 + 2 files changed, 33 insertions(+) diff --git a/lib/i915/gem_submission.c b/lib/i915/gem_submission.c index f1af4f97c..459ee21f9 100644 --- a/lib/i915/gem_submission.c +++ b/lib/i915/gem_submission.c @@ -472,3 +472,35 @@ bool gem_has_relocations(int i915) return has_relocs; } + +/** + * gem_allows_passing_alignment + * @fd: opened i915 drm file descriptor + * + * Check does i915 driver allows passing alignment in exec object to + * handle in kernel and adjust object offset accordingly. + * + * Returns: true if kernel supports setting offset to be aligned, otherwise + * false. + */ +bool gem_allows_passing_alignment(int fd) +{ + struct drm_i915_gem_exec_object2 obj = { + .handle = gem_create(fd, 4096), + }; + struct drm_i915_gem_execbuffer2 execbuf = { + .buffers_ptr = to_user_pointer(&obj), + .buffer_count = 1, + }; + bool ret; + const uint32_t bbe = MI_BATCH_BUFFER_END; + + gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe)); + gem_execbuf(fd, &execbuf); + + obj.alignment = 0x2000; + ret = __gem_execbuf(fd, &execbuf) == 0; + gem_close(fd, obj.handle); + + return ret; +} diff --git a/lib/i915/gem_submission.h b/lib/i915/gem_submission.h index 9b3e2a4e5..9f1ee8125 100644 --- a/lib/i915/gem_submission.h +++ b/lib/i915/gem_submission.h @@ -55,5 +55,6 @@ unsigned int gem_submission_measure(int i915, const intel_ctx_cfg_t *cfg, void gem_test_all_engines(int fd); bool gem_has_relocations(int fd); +bool gem_allows_passing_alignment(int fd); #endif /* GEM_SUBMISSION_H */ -- 2.26.0