From patchwork Fri Sep 13 19:51:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13803995 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 94AE2FA3750 for ; Fri, 13 Sep 2024 19:51:39 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 16AAA10ED4E; Fri, 13 Sep 2024 19:51:39 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="eGgB881q"; dkim-atps=neutral Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) by gabe.freedesktop.org (Postfix) with ESMTPS id B3A9710ED4D; Fri, 13 Sep 2024 19:51:37 +0000 (UTC) Received: by mail-pl1-f170.google.com with SMTP id d9443c01a7336-2053a0bd0a6so26432985ad.3; Fri, 13 Sep 2024 12:51:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726257096; x=1726861896; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=CB8jZGjPjnOyT8KVsrlJmg/A4Cpb/kxqtggkRJsoV9U=; b=eGgB881qm/khZaBKlh2m7gGJcknj0QF0kxPgDWJHYwTorjRrzG2Qb3kyi671uog/iD Fgjz1v7QuchTnZw9eu6d7iTAS/aL7VTMW9sGys6zfrcu8mBaRa0HVm5lSHLiO5XzNOyk 1ecIdjc0Ip/mlK4t2Xn03Ec3igeLFoRrZ2qBEARq+4WmA2di87S/tpbl4EFV9Qma/7Kw r9dsSNH/215zjCkRVNE5T7ukoQ9gGLFhugDyDmcXcYN3HY36cAjCp567/zU/6FUZyMt4 z/C3FUyNNtJbwT4i1MF2qv7nAXJmL9XlSDtTWQi0XSKr9Kn6n/vBxBw1kgYvZV9zY/eR a5ug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726257096; x=1726861896; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=CB8jZGjPjnOyT8KVsrlJmg/A4Cpb/kxqtggkRJsoV9U=; b=OgvLVxFgclddBf3msmljc43tzvjyiZkkWvZ3iFjeZopggaNO4dPPfAbKLThdq4zOmT e0JkOi9gedxjTVddZqE9Fjyte3SmGLyLaJ2qMl7rmu+UpXhdidlGgIwrHXQ1a46AfvlL zqiS/J4S2+GuDv8V7Fqc1InlTj2EUc0VVYfgfJxyqRihszLH/cqSphCzRqL35ACXYLeT 3QTHmOHgJnTyD4BEE9MjkymqNnFkPK7Ndwi+4ChXVlvmd6CZju3/mwA5T9VigkntpbXi cECcSQaCIeMPQ2ZRmWjEjR5CSm5Rc0LkbKSFuH3OrlROllK94cwtlMApeHtMfz2YK6GP vcPA== X-Forwarded-Encrypted: i=1; AJvYcCU8wxiuDXfW0Q8XjE/wGNSOeRlffedEVPW1yW7t+e40o05RZs3quMNhDkj5KSEFl1TyExuM6ARo5sQ=@lists.freedesktop.org X-Gm-Message-State: AOJu0YwdJAVLw8wOGjuMtVb8ZOCR1sTWCDB0mVDuhDqYbyVC3R+BgEyf WJf+bKDOb5OFsfkO71HROInQF6ijxNwcGW4AajZCtGiSsSXs6Fxwz7G7eA== X-Google-Smtp-Source: AGHT+IF2m8yqpRXDRCpHC9T48pLfZDaKaeeZwKrb5xVVqT8J3uKIrDGq4EO2eV7HtkaI2gEwjhuChA== X-Received: by 2002:a17:902:f693:b0:205:68a4:b2d8 with SMTP id d9443c01a7336-2076e3155e9mr125176375ad.11.1726257096201; Fri, 13 Sep 2024 12:51:36 -0700 (PDT) Received: from localhost ([2a00:79e1:2e00:1301:12e9:d196:a1e9:ab67]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-207945daa86sm169925ad.61.2024.09.13.12.51.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Sep 2024 12:51:35 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Akhil P Oommen , Connor Abbott , Rob Clark , Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] drm/msm/a6xx+: Insert a fence wait before SMMU table update Date: Fri, 13 Sep 2024 12:51:31 -0700 Message-ID: <20240913195132.8282-1-robdclark@gmail.com> X-Mailer: git-send-email 2.46.0 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" From: Rob Clark The CP_SMMU_TABLE_UPDATE _should_ be waiting for idle, but on some devices (x1-85, possibly others), it seems to pass that barrier while there are still things in the event completion FIFO waiting to be written back to memory. Work around that by adding a fence wait before context switch. The CP_EVENT_WRITE that writes the fence is the last write from a submit, so seeing this value hit memory is a reliable indication that it is safe to proceed with the context switch. Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/63 Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index bcaec86ac67a..ba5b35502e6d 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -101,9 +101,10 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter, } static void a6xx_set_pagetable(struct a6xx_gpu *a6xx_gpu, - struct msm_ringbuffer *ring, struct msm_file_private *ctx) + struct msm_ringbuffer *ring, struct msm_gem_submit *submit) { bool sysprof = refcount_read(&a6xx_gpu->base.base.sysprof_active) > 1; + struct msm_file_private *ctx = submit->queue->ctx; struct adreno_gpu *adreno_gpu = &a6xx_gpu->base; phys_addr_t ttbr; u32 asid; @@ -115,6 +116,13 @@ static void a6xx_set_pagetable(struct a6xx_gpu *a6xx_gpu, if (msm_iommu_pagetable_params(ctx->aspace->mmu, &ttbr, &asid)) return; + /* Wait for previous submit to complete before continuing: */ + OUT_PKT7(ring, CP_WAIT_TIMESTAMP, 4); + OUT_RING(ring, 0); + OUT_RING(ring, lower_32_bits(rbmemptr(ring, fence))); + OUT_RING(ring, upper_32_bits(rbmemptr(ring, fence))); + OUT_RING(ring, submit->seqno - 1); + if (!sysprof) { if (!adreno_is_a7xx(adreno_gpu)) { /* Turn off protected mode to write to special registers */ @@ -193,7 +201,7 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit) struct msm_ringbuffer *ring = submit->ring; unsigned int i, ibs = 0; - a6xx_set_pagetable(a6xx_gpu, ring, submit->queue->ctx); + a6xx_set_pagetable(a6xx_gpu, ring, submit); get_stats_counter(ring, REG_A6XX_RBBM_PERFCTR_CP(0), rbmemptr_stats(ring, index, cpcycles_start)); @@ -283,7 +291,7 @@ static void a7xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit) OUT_PKT7(ring, CP_THREAD_CONTROL, 1); OUT_RING(ring, CP_THREAD_CONTROL_0_SYNC_THREADS | CP_SET_THREAD_BR); - a6xx_set_pagetable(a6xx_gpu, ring, submit->queue->ctx); + a6xx_set_pagetable(a6xx_gpu, ring, submit); get_stats_counter(ring, REG_A7XX_RBBM_PERFCTR_CP(0), rbmemptr_stats(ring, index, cpcycles_start));