From patchwork Wed Sep 4 09:58:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 13790293 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 EC8DE1CEEA2 for ; Wed, 4 Sep 2024 09:58:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725443937; cv=none; b=swf/Gi4rf29lA5xIhx/vC4JGYSfn0oZOZeRmqN35EueDZX4kSqr5VNhhD4PMXnwXaniJzaMFgBwgPaMdElPV7fhdSi7ZBmj2wvP8KprJYXeBS0ehfxr1g4M12QkHvLEo0UqmjnIr3ewHlddLBHAcC+gfVaBxBOx+fFHCrarK9ic= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725443937; c=relaxed/simple; bh=FJ2Fo9DL1043gErlcSskU8TfqjfFGx+kZXzxQbfqQbI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=KZ1dYLrJ1ttyB0vp247N2fwJEp9Y4GAiz7pmetcvyvX4+WwgxTVJf8K0BBnei+Me+sIFv+lR/dtDssiF1liGtf/Q+2n3rt/7h0fg7AU84fdWAhLRBGwUX9HLkCHx7juj5/wd51rdPGK3QOxMHZqEMCiga5OmCuRscImUTUPuD2I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=jY+qpoQc; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="jY+qpoQc" Received: from ideasonboard.com (93-61-96-190.ip145.fastwebnet.it [93.61.96.190]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 715772E3; Wed, 4 Sep 2024 11:57:41 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725443861; bh=FJ2Fo9DL1043gErlcSskU8TfqjfFGx+kZXzxQbfqQbI=; h=From:To:Cc:Subject:Date:From; b=jY+qpoQcGzBlHCxASWQpy5A8racF378F3MuiNFMHyVlLEPWdd9/QA/HwVk1iaSdZK BCi59wFe8NgsI/yKoPBtq0q3erxo2Yud5N38WuRgU+5/mYOobD61/IL4BkgwFlL6QT P7JEfPEzkWEvMpVs5Df6tEEuOX+S1qwW3epY7nJA= From: Jacopo Mondi To: Naushir Patuck , Nick Hollinghurst , David Plowman , Dave Stevenson , Laurent Pinchart Cc: Jacopo Mondi , linux-media@vger.kernel.org Subject: [PATCH v5 0/4] media: pisp-be: Split jobs creation and scheduling Date: Wed, 4 Sep 2024 11:58:31 +0200 Message-ID: <20240904095836.344833-1-jacopo.mondi@ideasonboard.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 v4->v5: - Use appropriate locking constructs: - spin_lock_irq() for pispbe_prepare_job() called from non irq context - spin_lock_irqsave() for pispbe_schedule() called from irq context - Remove hw_lock from ready_queue accesses in stop_streaming and start_streaming - Fix trivial indentation mistake in 4/4 v3->v4: - Expand commit message in 2/4 to explain why removing validation in schedule() is safe - Drop ready_lock spinlock - Use non _irqsave version of safe_guard(spinlock - Support !CONFIG_PM in 4/4 by calling the enable/disable routines directly and adjust pm_runtime usage as suggested by Laurent v2->v3: - Mark pispbe_runtime_resume() as __maybe_unused - Add fixes tags where appropriate v1->v2: - Add two patches to address Laurent's comments separately - use scoped_guard() when possible - Add patch to fix runtime_pm imbalance Currently the 'pispbe_schedule()' function does two things: 1) Tries to assemble a job by inspecting all the video node queues to make sure all the required buffers are available 2) Submit the job to the hardware The pispbe_schedule() function is called at: - video device start_streaming() time - video device qbuf() time - irq handler As assembling a job requires inspecting all queues, it is a rather time consuming operation which is better not run in IRQ context. To avoid executing the time consuming job creation in interrupt context, split the job creation and job scheduling in two distinct operations. When a well-formed job is created, append it to the newly introduced 'pispbe->job_queue' where it will be dequeued from by the scheduling routine. At start_streaming() and qbuf() time immediately try to schedule a job if one has been created as the irq handler routine is only called when a job has completed, and we can't solely rely on it for scheduling new jobs. Jacopo Mondi (4): media: pisp_be: Drop reference to non-existing function media: pisp_be: Remove config validation from schedule() media: pisp_be: Split jobs creation and scheduling media: pisp_be: Fix pm_runtime underrun in probe .../platform/raspberrypi/pisp_be/pisp_be.c | 202 +++++++++--------- 1 file changed, 96 insertions(+), 106 deletions(-) --- 2.46.0