From patchwork Mon Oct 31 22:54:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 620268 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 0B277FA3741 for ; Mon, 31 Oct 2022 22:54:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229637AbiJaWyN (ORCPT ); Mon, 31 Oct 2022 18:54:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229920AbiJaWyM (ORCPT ); Mon, 31 Oct 2022 18:54:12 -0400 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07A2B13DD0; Mon, 31 Oct 2022 15:54:11 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id h193so3237511pgc.10; Mon, 31 Oct 2022 15:54:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=RiVXEvEzqUG+Z4LGnvslCa6bZT/BrJ9oTtksveCxmNM=; b=E2u7Itjt5rlL5oPtdrvjXaT8jUjC1BpZHzJNkPsRKyeuvtdKcahIvEGH7N+g+KuuRl VKGMtebR1fbRx0X/ZGYCVj0K+obNBIdYrqZTDVkU3KvinZPxNhuPVCtHiPw2nuNTaZ4M rkW/suo0u5Lu1JEYAsewsIcxitAo/AkmRazDwHzM4TkYuds1rHWpphg1y6bp8qPZmhrC BP9rVFfkfZeRueLvLObewS7kNqdWVlv+kyzNh1jDHz3Y6c3MF8Q6MR+97psgSufFfxOE rNOR9oW0eXUmaMJoCTDbrGIr8wgVnEX8gJZAmjIfUGjV3VBdKNPcv85K56C+YeDpGLbV viNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=RiVXEvEzqUG+Z4LGnvslCa6bZT/BrJ9oTtksveCxmNM=; b=aNSwUp6da1x89W468nZNMEWV9zq+PHHSxKR0b04wPOlHa3+u/EzCG9k6z5teKMcjeV mP4ULntsc4SuX49+9sao1+DW648BwrziiSxNRgDZ0kJyyvk/ccLhMKe7jap8pDBMHN8I l9z9MpOXXv3gOibQ1U4WhBoaXRDY8nSP9Pw0zncC7tnyz5Dpf5qDYJybiwxHllbl/o5U BASS9+GUnWX0ooz0XeRD/RRTG3Rg7HhtpFk1C9vaqKi7X2BcrtIY6iCzNPE9jVVpQGj9 UM5KcQY6+tG7yEK0rRWUM2R+5hoGnnY2yTqaqcZKitufIXKPBIF49aL+jHJsuryvSbMI t+bw== X-Gm-Message-State: ACrzQf1hguoazOdMbJP7+Bvdn/AaBashcfwgGnhLBuOUzRihnO08DoHb tVX8XCWFMytPdWzzO3GA3lKpc8mayFE= X-Google-Smtp-Source: AMsMyM60J9LUoOFuV/UcqeY/BNTtBDPyBHOcnTH5UogjcyU8U6HEhocEoYxoxQ+SM2hfNaIpvPottw== X-Received: by 2002:a65:6bd3:0:b0:42b:9117:b9d1 with SMTP id e19-20020a656bd3000000b0042b9117b9d1mr14578565pgw.238.1667256850337; Mon, 31 Oct 2022 15:54:10 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:2703:3c72:eb1a:cffd]) by smtp.gmail.com with ESMTPSA id b6-20020a170903228600b001869d71228bsm4937216plh.170.2022.10.31.15.54.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 15:54:09 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , David Airlie , Daniel Vetter , Akhil P Oommen , Chia-I Wu , Konrad Dybcio , Douglas Anderson , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/2] drm/msm: Hangcheck progress detection Date: Mon, 31 Oct 2022 15:54:07 -0700 Message-Id: <20221031225414.1280169-3-robdclark@gmail.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221031225414.1280169-1-robdclark@gmail.com> References: <20221031225414.1280169-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark If the hangcheck timer expires, check if the fw's position in the cmdstream has advanced (changed) since last timer expiration, and allow it up to three additional "extensions" to it's alotted time. The intention is to continue to catch "shader stuck in a loop" type hangs quickly, but allow more time for things that are actually making forward progress. Because we need to sample the CP state twice to detect if there has not been progress, this also cuts the the timer's duration in half. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 34 +++++++++++++++++++++++++++ drivers/gpu/drm/msm/msm_drv.h | 8 ++++++- drivers/gpu/drm/msm/msm_gpu.c | 20 +++++++++++++++- drivers/gpu/drm/msm/msm_gpu.h | 5 +++- drivers/gpu/drm/msm/msm_ringbuffer.h | 24 +++++++++++++++++++ 5 files changed, 88 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index 1ff605c18ee6..3b8fb7a11dff 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -1843,6 +1843,39 @@ static uint32_t a6xx_get_rptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring) return ring->memptrs->rptr = gpu_read(gpu, REG_A6XX_CP_RB_RPTR); } +static bool a6xx_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring) +{ + struct msm_cp_state cp_state = { + .ib1_base = gpu_read64(gpu, REG_A6XX_CP_IB1_BASE), + .ib2_base = gpu_read64(gpu, REG_A6XX_CP_IB2_BASE), + .ib1_rem = gpu_read(gpu, REG_A6XX_CP_IB1_REM_SIZE), + .ib2_rem = gpu_read(gpu, REG_A6XX_CP_IB2_REM_SIZE), + }; + bool progress; + + /* + * Adjust the remaining data to account for what has already been + * fetched from memory, but not yet consumed by the SQE. + * + * This is not *technically* correct, the amount buffered could + * exceed the IB size due to hw prefetching ahead, but: + * + * (1) We aren't trying to find the exact position, just whether + * progress has been made + * (2) The CP_REG_TO_MEM at the end of a submit should be enough + * to prevent prefetching into an unrelated submit. (And + * either way, at some point the ROQ will be full.) + */ + cp_state.ib1_rem += gpu_read(gpu, REG_A6XX_CP_CSQ_IB1_STAT) >> 16; + cp_state.ib2_rem += gpu_read(gpu, REG_A6XX_CP_CSQ_IB1_STAT) >> 16; + + progress = !!memcmp(&cp_state, &ring->last_cp_state, sizeof(cp_state)); + + ring->last_cp_state = cp_state; + + return progress; +} + static u32 a618_get_speed_bin(u32 fuse) { if (fuse == 0) @@ -1961,6 +1994,7 @@ static const struct adreno_gpu_funcs funcs = { .create_address_space = a6xx_create_address_space, .create_private_address_space = a6xx_create_private_address_space, .get_rptr = a6xx_get_rptr, + .progress = a6xx_progress, }, .get_timestamp = a6xx_get_timestamp, }; diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index efcd7260f428..970a1a0ab34f 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -226,7 +226,13 @@ struct msm_drm_private { struct drm_atomic_state *pm_state; - /* For hang detection, in ms */ + /** + * hangcheck_period: For hang detection, in ms + * + * Note that in practice, a submit/job will get at least two hangcheck + * periods, due to checking for progress being implemented as simply + * "have the CP position registers changed since last time?" + */ unsigned int hangcheck_period; /** diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index 3dffee54a951..136f5977b0bf 100644 --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -500,6 +500,21 @@ static void hangcheck_timer_reset(struct msm_gpu *gpu) round_jiffies_up(jiffies + msecs_to_jiffies(priv->hangcheck_period))); } +static bool made_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring) +{ + if (ring->hangcheck_progress_retries >= DRM_MSM_HANGCHECK_PROGRESS_RETRIES) + return false; + + if (!gpu->funcs->progress) + return false; + + if (!gpu->funcs->progress(gpu, ring)) + return false; + + ring->hangcheck_progress_retries++; + return true; +} + static void hangcheck_handler(struct timer_list *t) { struct msm_gpu *gpu = from_timer(gpu, t, hangcheck_timer); @@ -511,9 +526,12 @@ static void hangcheck_handler(struct timer_list *t) if (fence != ring->hangcheck_fence) { /* some progress has been made.. ya! */ ring->hangcheck_fence = fence; - } else if (fence_before(fence, ring->fctx->last_fence)) { + ring->hangcheck_progress_retries = 0; + } else if (fence_before(fence, ring->fctx->last_fence) && + !made_progress(gpu, ring)) { /* no progress and not done.. hung! */ ring->hangcheck_fence = fence; + ring->hangcheck_progress_retries = 0; DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n", gpu->name, ring->id); DRM_DEV_ERROR(dev->dev, "%s: completed fence: %u\n", diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index 585fd9c8d45a..d8f355e9f0b2 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -78,6 +78,8 @@ struct msm_gpu_funcs { struct msm_gem_address_space *(*create_private_address_space) (struct msm_gpu *gpu); uint32_t (*get_rptr)(struct msm_gpu *gpu, struct msm_ringbuffer *ring); + + bool (*progress)(struct msm_gpu *gpu, struct msm_ringbuffer *ring); }; /* Additional state for iommu faults: */ @@ -236,7 +238,8 @@ struct msm_gpu { */ #define DRM_MSM_INACTIVE_PERIOD 66 /* in ms (roughly four frames) */ -#define DRM_MSM_HANGCHECK_DEFAULT_PERIOD 500 /* in ms */ +#define DRM_MSM_HANGCHECK_DEFAULT_PERIOD 250 /* in ms */ +#define DRM_MSM_HANGCHECK_PROGRESS_RETRIES 3 struct timer_list hangcheck_timer; /* Fault info for most recent iova fault: */ diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h index 2a5045abe46e..e3d33bae3380 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.h +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h @@ -35,6 +35,11 @@ struct msm_rbmemptrs { volatile u64 ttbr0; }; +struct msm_cp_state { + uint64_t ib1_base, ib2_base; + uint32_t ib1_rem, ib2_rem; +}; + struct msm_ringbuffer { struct msm_gpu *gpu; int id; @@ -64,6 +69,25 @@ struct msm_ringbuffer { uint64_t memptrs_iova; struct msm_fence_context *fctx; + /** + * hangcheck_progress_retries: + * + * The number of extra hangcheck duration cycles that we have given + * due to it appearing that the GPU is making forward progress. + * + * If the GPU appears to be making progress (ie. the CP has advanced + * in the command stream, we'll allow up to DRM_MSM_HANGCHECK_PROGRESS_RETRIES + * expirations of the hangcheck timer before killing the job. In other + * words we'll let the submit run for up to + * DRM_MSM_HANGCHECK_DEFAULT_PERIOD * DRM_MSM_HANGCHECK_PROGRESS_RETRIES + */ + int hangcheck_progress_retries; + + /** + * last_cp_state: The state of the CP at the last call to gpu->progress() + */ + struct msm_cp_state last_cp_state; + /* * preempt_lock protects preemption and serializes wptr updates against * preemption. Can be aquired from irq context.