From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 207A21D0953; Wed, 2 Oct 2024 14:33:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727879614; cv=none; b=KWYqQHIvxggM2O+yZ1X4E97UGRmqpmL4ZndQnGZSOwLQPnZypNuJWocVpVsWag2tZ30mcdaKO/DhrCnfrTAUo6tD3LrfEFPyo6RDPUp2zn1xK1w69WO/SJKIQr15kyBbwH82FTzfhC7EIirJxJh7apF+oZox8dTPEVxnlS5ZANA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727879614; c=relaxed/simple; bh=zwbx6C2IchAZCjtKaj0aeTORDrsJb1OLME26vq1wvRA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tkYBTbf4XSrxGxQZC8836Z0w3gtssQNHIBo83bquBvY20WPXq1meHypGVqkl3JELnzTa/J5uLMoZ3FKg0lbnqLsatl9z0HBSXCIcerE+1Pw/KM1Rm2Cp9dGDLpXyRV3dSsAdFgWFTEgVYrgHuu39Cj5tLO7akgEd+Ml1WYJZiaw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UZQ9bC1K; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UZQ9bC1K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DD1AC4CEC2; Wed, 2 Oct 2024 14:33:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727879614; bh=zwbx6C2IchAZCjtKaj0aeTORDrsJb1OLME26vq1wvRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UZQ9bC1K1UxR0K1th/wHCiWFZvZi80anBlHSmgF3/nakHdsYZ/NMBvhWN8/+d+a0/ i9CKrWeUuXuF76E56kTV0JDahI3Ia73RBa4lJnGSs0UaAXHe6xqsvgBHkck+YiTU/G jrKAeg+uo96jEF8guA1a6AS246QpoDR6/XsXO/vQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vladimir Lypak , Rob Clark , Sasha Levin Subject: [PATCH 6.6 162/538] drm/msm/a5xx: workaround early ring-buffer emptiness check Date: Wed, 2 Oct 2024 14:56:41 +0200 Message-ID: <20241002125758.648894713@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002125751.964700919@linuxfoundation.org> References: <20241002125751.964700919@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vladimir Lypak [ Upstream commit a30f9f65b5ac82d4390548c32ed9c7f05de7ddf5 ] There is another cause for soft lock-up of GPU in empty ring-buffer: race between GPU executing last commands and CPU checking ring for emptiness. On GPU side IRQ for retire is triggered by CACHE_FLUSH_TS event and RPTR shadow (which is used to check ring emptiness) is updated a bit later from CP_CONTEXT_SWITCH_YIELD. Thus if GPU is executing its last commands slow enough or we check that ring too fast we will miss a chance to trigger switch to lower priority ring because current ring isn't empty just yet. This can escalate to lock-up situation described in previous patch. To work-around this issue we keep track of last submit sequence number for each ring and compare it with one written to memptrs from GPU during execution of CACHE_FLUSH_TS event. Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets") Signed-off-by: Vladimir Lypak Patchwork: https://patchwork.freedesktop.org/patch/612047/ Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 ++++ drivers/gpu/drm/msm/adreno/a5xx_gpu.h | 1 + drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 4 ++++ 3 files changed, 9 insertions(+) diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c index 14d3a3e78a9db..8c2758a18a19c 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c @@ -65,6 +65,8 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring, static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit) { + struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); + struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu); struct msm_ringbuffer *ring = submit->ring; struct drm_gem_object *obj; uint32_t *ptr, dwords; @@ -109,6 +111,7 @@ static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit } } + a5xx_gpu->last_seqno[ring->id] = submit->seqno; a5xx_flush(gpu, ring, true); a5xx_preempt_trigger(gpu); @@ -210,6 +213,7 @@ static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit) /* Write the fence to the scratch register */ OUT_PKT4(ring, REG_A5XX_CP_SCRATCH_REG(2), 1); OUT_RING(ring, submit->seqno); + a5xx_gpu->last_seqno[ring->id] = submit->seqno; /* * Execute a CACHE_FLUSH_TS event. This will ensure that the diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h index b4d06ca3e499d..9c0d701fe4b85 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h @@ -34,6 +34,7 @@ struct a5xx_gpu { struct drm_gem_object *preempt_counters_bo[MSM_GPU_MAX_RINGS]; struct a5xx_preempt_record *preempt[MSM_GPU_MAX_RINGS]; uint64_t preempt_iova[MSM_GPU_MAX_RINGS]; + uint32_t last_seqno[MSM_GPU_MAX_RINGS]; atomic_t preempt_state; spinlock_t preempt_start_lock; diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c index c65b34a4a8cc2..0469fea550108 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c @@ -55,6 +55,8 @@ static inline void update_wptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring) /* Return the highest priority ringbuffer with something in it */ static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu) { + struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); + struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu); unsigned long flags; int i; @@ -64,6 +66,8 @@ static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu) spin_lock_irqsave(&ring->preempt_lock, flags); empty = (get_wptr(ring) == gpu->funcs->get_rptr(gpu, ring)); + if (!empty && ring == a5xx_gpu->cur_ring) + empty = ring->memptrs->fence == a5xx_gpu->last_seqno[i]; spin_unlock_irqrestore(&ring->preempt_lock, flags); if (!empty) -- 2.43.0