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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10454C6FD1D for ; Mon, 20 Mar 2023 14:45:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231916AbjCTOpz (ORCPT ); Mon, 20 Mar 2023 10:45:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231987AbjCTOpG (ORCPT ); Mon, 20 Mar 2023 10:45:06 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D06FECA1E; Mon, 20 Mar 2023 07:44:48 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id gp15-20020a17090adf0f00b0023d1bbd9f9eso16772440pjb.0; Mon, 20 Mar 2023 07:44:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679323487; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=weYL3fqvUQCe/MGsBiphMuUm7IiUfAgwOkX0hsG5azI=; b=XoB4+mM4oASSRnco8nkZwARRG9zcXJcuiyLTtkB1/Em3LEQ2A1GcFBX4c9QpNQQF1j NODZTXwBb1ZsRgqzzncmT68xS+JsVOMXu4/yL4tqZacnngCN5gnrIyIgLpg67GCQaWu2 3RGsxmBtiA8aCU5oOdtb6AigAsxMRRyYT/P3Xh3WrVDvz6jvLttylpc7USgWWQ44GVqe rYzg55l+AaLbimu//o2q7VRZZJ2UA2rlR+D7WRutg8GbWIEPrBcIPRitI3OqhFoohqaA 20Pha7DZD60SGbvPicWbg+l+r5k+WAzhnRYWrhfrBafJ9eHbu4hwWd94ZwQX/0whZg/7 88jA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679323487; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=weYL3fqvUQCe/MGsBiphMuUm7IiUfAgwOkX0hsG5azI=; b=4SU08Y7DjTy3Hb9zVvuTKqLxJNA1kKe3NBIh8EW3M7yWFGFxSyvv9LSJqlSZnsw2Ma u9ecKaMa4RsrSkF0xwRPfaXIhzB8o738x+IoxG418NJ0iV6H+G000/Qy8XLF564F8F5k rZcfEU3puAxbiKe3/rYjqBBsKNPNl1w/oL1rno52+5oHCCOHHGdGVcvvNQ8T7is65qsr r5JWdydfTatPMCzzwLQoCbNws34vJ9DR+coGfaVGpjvpd3mbchvQLoXS43ECAjubx1N8 /9edCEaa1bAZqpI6jgbfk6vllktxLKFzEYXjmsxd9+VaK6/ZJLUS86+hP6MrTOEwntr+ S8Lw== X-Gm-Message-State: AO0yUKUfUmMwyAowKOjglmlPB9/pXIOyYJTY0uwhF9TVv9chD3SttSJW qw/ivGhFtuG2DVJOXuh7A/s= X-Google-Smtp-Source: AK7set/q6mxFL2SNpoyCJqlGoIsp6zXx5THF6Tar0/8ALnqXrSzyWxWyrmITe8Cih+IgIxzET11mjA== X-Received: by 2002:a17:902:d2ca:b0:19d:1c6e:d31e with SMTP id n10-20020a170902d2ca00b0019d1c6ed31emr21226848plc.60.1679323487099; Mon, 20 Mar 2023 07:44:47 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:61b:48ed:72ab:435b]) by smtp.gmail.com with ESMTPSA id g7-20020a170902934700b0019d397b0f18sm6777259plp.214.2023.03.20.07.44.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Mar 2023 07:44:46 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Daniel Vetter , freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Rob Clark , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , David Airlie , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK), linaro-mm-sig@lists.linaro.org (moderated list:DMA BUFFER SHARING FRAMEWORK) Subject: [PATCH v2 09/23] drm/msm/gem: Avoid obj lock in job_run() Date: Mon, 20 Mar 2023 07:43:31 -0700 Message-Id: <20230320144356.803762-10-robdclark@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230320144356.803762-1-robdclark@gmail.com> References: <20230320144356.803762-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rob Clark Now that everything that controls which LRU an obj lives in *except* the backing pages is protected by the LRU lock, add a special path to unpin in the job_run() path, we we are assured that we already have backing pages and will not be racing against eviction (because the GEM object's dma_resv contains the fence that will be signaled when the submit/job completes). Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_gem.c | 44 +++++++++++++++++++++++----- drivers/gpu/drm/msm/msm_gem.h | 1 + drivers/gpu/drm/msm/msm_ringbuffer.c | 4 +-- 3 files changed, 39 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index d0ac3e704b66..9628e8d8dd02 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -61,18 +61,14 @@ static void sync_for_cpu(struct msm_gem_object *msm_obj) dma_unmap_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0); } -static void update_lru_locked(struct drm_gem_object *obj) +static void update_lru_active(struct drm_gem_object *obj) { struct msm_drm_private *priv = obj->dev->dev_private; struct msm_gem_object *msm_obj = to_msm_bo(obj); - msm_gem_assert_locked(&msm_obj->base); - - if (!msm_obj->pages) { - GEM_WARN_ON(msm_obj->pin_count); + GEM_WARN_ON(!msm_obj->pages); - drm_gem_lru_move_tail_locked(&priv->lru.unbacked, obj); - } else if (msm_obj->pin_count) { + if (msm_obj->pin_count) { drm_gem_lru_move_tail_locked(&priv->lru.pinned, obj); } else if (msm_obj->madv == MSM_MADV_WILLNEED) { drm_gem_lru_move_tail_locked(&priv->lru.willneed, obj); @@ -83,6 +79,22 @@ static void update_lru_locked(struct drm_gem_object *obj) } } +static void update_lru_locked(struct drm_gem_object *obj) +{ + struct msm_drm_private *priv = obj->dev->dev_private; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + msm_gem_assert_locked(&msm_obj->base); + + if (!msm_obj->pages) { + GEM_WARN_ON(msm_obj->pin_count); + + drm_gem_lru_move_tail_locked(&priv->lru.unbacked, obj); + } else { + update_lru_active(obj); + } +} + static void update_lru(struct drm_gem_object *obj) { struct msm_drm_private *priv = obj->dev->dev_private; @@ -489,6 +501,24 @@ void msm_gem_unpin_locked(struct drm_gem_object *obj) mutex_unlock(&priv->lru.lock); } +/* Special unpin path for use in fence-signaling path, avoiding the need + * to hold the obj lock by only depending on things that a protected by + * the LRU lock. In particular we know that that we already have backing + * and and that the object's dma_resv has the fence for the current + * submit/job which will prevent us racing against page eviction. + */ +void msm_gem_unpin_active(struct drm_gem_object *obj) +{ + struct msm_drm_private *priv = obj->dev->dev_private; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + mutex_lock(&priv->lru.lock); + msm_obj->pin_count--; + GEM_WARN_ON(msm_obj->pin_count < 0); + update_lru_active(obj); + mutex_unlock(&priv->lru.lock); +} + struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj, struct msm_gem_address_space *aspace) { diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h index 0057e8e8fa13..2bd6846c83a9 100644 --- a/drivers/gpu/drm/msm/msm_gem.h +++ b/drivers/gpu/drm/msm/msm_gem.h @@ -128,6 +128,7 @@ struct msm_gem_object { uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj); int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct msm_gem_vma *vma); void msm_gem_unpin_locked(struct drm_gem_object *obj); +void msm_gem_unpin_active(struct drm_gem_object *obj); struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj, struct msm_gem_address_space *aspace); int msm_gem_get_iova(struct drm_gem_object *obj, diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c index 31b4fbf96c36..b60199184409 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.c +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c @@ -24,9 +24,7 @@ static struct dma_fence *msm_job_run(struct drm_sched_job *job) struct drm_gem_object *obj = &submit->bos[i].obj->base; msm_gem_vma_unpin_fenced(submit->bos[i].vma, fctx); - msm_gem_lock(obj); - msm_gem_unpin_locked(obj); - msm_gem_unlock(obj); + msm_gem_unpin_active(obj); submit->bos[i].flags &= ~(BO_VMA_PINNED | BO_OBJ_PINNED); } -- 2.39.2