From patchwork Thu Oct 14 17:20:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12559109 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E73FC433F5 for ; Thu, 14 Oct 2021 17:47:54 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 3C87460F11 for ; Thu, 14 Oct 2021 17:47:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3C87460F11 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 34C456E88E; Thu, 14 Oct 2021 17:47:48 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6928F6E817; Thu, 14 Oct 2021 17:47:44 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10137"; a="291231650" X-IronPort-AV: E=Sophos;i="5.85,373,1624345200"; d="scan'208";a="291231650" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2021 10:25:04 -0700 X-IronPort-AV: E=Sophos;i="5.85,373,1624345200"; d="scan'208";a="481360479" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2021 10:25:01 -0700 From: Matthew Brost To: , Cc: Subject: [PATCH 21/25] drm/i915/guc: Handle errors in multi-lrc requests Date: Thu, 14 Oct 2021 10:20:01 -0700 Message-Id: <20211014172005.27155-22-matthew.brost@intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211014172005.27155-1-matthew.brost@intel.com> References: <20211014172005.27155-1-matthew.brost@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" If an error occurs in the front end when multi-lrc requests are getting generated we need to skip these in the backend but we still need to emit the breadcrumbs seqno. An issues arises because with multi-lrc breadcrumbs there is a handshake between the parent and children to make forward progress. If all the requests are not present this handshake doesn't work. To work around this, if multi-lrc request has an error we skip the handshake but still emit the breadcrumbs seqno. v2: (John Harrison) - Add comment explaining the skipping of the handshake logic - Fix typos in the commit message v3: (John Harrison) - Fix up some comments about the math to NOP the ring Signed-off-by: Matthew Brost Reviewed-by: John Harrison --- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 69 ++++++++++++++++++- 1 file changed, 66 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 361fab2cae99..d7710debcd47 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -4070,8 +4070,8 @@ static int emit_bb_start_child_no_preempt_mid_batch(struct i915_request *rq, } static u32 * -emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, - u32 *cs) +__emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs) { struct intel_context *ce = rq->context; u8 i; @@ -4099,6 +4099,45 @@ emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, get_children_go_addr(ce), 0); + return cs; +} + +/* + * If this true, a submission of multi-lrc requests had an error and the + * requests need to be skipped. The front end (execuf IOCTL) should've called + * i915_request_skip which squashes the BB but we still need to emit the fini + * breadrcrumbs seqno write. At this point we don't know how many of the + * requests in the multi-lrc submission were generated so we can't do the + * handshake between the parent and children (e.g. if 4 requests should be + * generated but 2nd hit an error only 1 would be seen by the GuC backend). + * Simply skip the handshake, but still emit the breadcrumbd seqno, if an error + * has occurred on any of the requests in submission / relationship. + */ +static inline bool skip_handshake(struct i915_request *rq) +{ + return test_bit(I915_FENCE_FLAG_SKIP_PARALLEL, &rq->fence.flags); +} + +static u32 * +emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs) +{ + struct intel_context *ce = rq->context; + + GEM_BUG_ON(!intel_context_is_parent(ce)); + + if (unlikely(skip_handshake(rq))) { + /* + * NOP everything in __emit_fini_breadcrumb_parent_no_preempt_mid_batch, + * the -6 comes from the length of the emits below. + */ + memset(cs, 0, sizeof(u32) * + (ce->engine->emit_fini_breadcrumb_dw - 6)); + cs += ce->engine->emit_fini_breadcrumb_dw - 6; + } else { + cs = __emit_fini_breadcrumb_parent_no_preempt_mid_batch(rq, cs); + } + /* Emit fini breadcrumb */ cs = gen8_emit_ggtt_write(cs, rq->fence.seqno, @@ -4115,7 +4154,8 @@ emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, } static u32 * -emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, u32 *cs) +__emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs) { struct intel_context *ce = rq->context; struct intel_context *parent = intel_context_to_parent(ce); @@ -4142,6 +4182,29 @@ emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, u32 *cs *cs++ = get_children_go_addr(parent); *cs++ = 0; + return cs; +} + +static u32 * +emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs) +{ + struct intel_context *ce = rq->context; + + GEM_BUG_ON(!intel_context_is_child(ce)); + + if (unlikely(skip_handshake(rq))) { + /* + * NOP everything in __emit_fini_breadcrumb_child_no_preempt_mid_batch, + * the -6 comes from the length of the emits below. + */ + memset(cs, 0, sizeof(u32) * + (ce->engine->emit_fini_breadcrumb_dw - 6)); + cs += ce->engine->emit_fini_breadcrumb_dw - 6; + } else { + cs = __emit_fini_breadcrumb_child_no_preempt_mid_batch(rq, cs); + } + /* Emit fini breadcrumb */ cs = gen8_emit_ggtt_write(cs, rq->fence.seqno,