From patchwork Tue May 12 12:05:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dafna Hirschfeld X-Patchwork-Id: 11543047 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 265D015E6 for ; Tue, 12 May 2020 12:06:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 178D32078A for ; Tue, 12 May 2020 12:06:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729595AbgELMGL (ORCPT ); Tue, 12 May 2020 08:06:11 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:35096 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729207AbgELMGK (ORCPT ); Tue, 12 May 2020 08:06:10 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: dafna) with ESMTPSA id C64F32A20C6 From: Dafna Hirschfeld To: linux-media@vger.kernel.org Cc: dafna.hirschfeld@collabora.com, helen.koike@collabora.com, ezequiel@collabora.com, hverkuil@xs4all.nl, kernel@collabora.com, dafna3@gmail.com, sakari.ailus@linux.intel.com, linux-rockchip@lists.infradead.org, mchehab@kernel.org, laurent.pinchart@ideasonboard.com Subject: [PATCH 4/5] media: staging: rkisp1: stats: replace locks wq_lock, irq_lock with one lock Date: Tue, 12 May 2020 14:05:21 +0200 Message-Id: <20200512120522.25960-5-dafna.hirschfeld@collabora.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200512120522.25960-1-dafna.hirschfeld@collabora.com> References: <20200512120522.25960-1-dafna.hirschfeld@collabora.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch removes two locks in the rkisp1_stats struct: - The mutex 'wq_lock' that is used to protect the buffers list 'stat' - The spin_lock 'irq_lock' that is used to protect the variable 'is_streaming' It replaces them with one spin_lock 'stats_lock' that protects both the buffers list and the 'is_streaming' variable. Signed-off-by: Dafna Hirschfeld --- drivers/staging/media/rkisp1/rkisp1-common.h | 5 ++-- drivers/staging/media/rkisp1/rkisp1-stats.c | 27 ++++++++++---------- 2 files changed, 15 insertions(+), 17 deletions(-) diff --git a/drivers/staging/media/rkisp1/rkisp1-common.h b/drivers/staging/media/rkisp1/rkisp1-common.h index c0ab16c6b3db..c635bb0a7727 100644 --- a/drivers/staging/media/rkisp1/rkisp1-common.h +++ b/drivers/staging/media/rkisp1/rkisp1-common.h @@ -178,7 +178,7 @@ struct rkisp1_capture { /* * struct rkisp1_stats - ISP Statistics device * - * @irq_lock: buffer queue lock + * @stats_lock: locks the buffer list 'stat' and 'is_streaming' * @stat: stats buffer list * @readout_wq: workqueue for statistics information read */ @@ -186,13 +186,12 @@ struct rkisp1_stats { struct rkisp1_vdev_node vnode; struct rkisp1_device *rkisp1; - spinlock_t irq_lock; + spinlock_t stats_lock; /* locks 'is_streaming', and 'stats' */ struct list_head stat; struct v4l2_format vdev_fmt; bool is_streaming; struct workqueue_struct *readout_wq; - struct mutex wq_lock; }; /* diff --git a/drivers/staging/media/rkisp1/rkisp1-stats.c b/drivers/staging/media/rkisp1/rkisp1-stats.c index 5578fdeb8a18..e6fb2c5f3b3e 100644 --- a/drivers/staging/media/rkisp1/rkisp1-stats.c +++ b/drivers/staging/media/rkisp1/rkisp1-stats.c @@ -130,12 +130,13 @@ static void rkisp1_stats_vb2_buf_queue(struct vb2_buffer *vb) container_of(vbuf, struct rkisp1_buffer, vb); struct vb2_queue *vq = vb->vb2_queue; struct rkisp1_stats *stats_dev = vq->drv_priv; + unsigned long flags; stats_buf->vaddr[0] = vb2_plane_vaddr(vb, 0); - mutex_lock(&stats_dev->wq_lock); + spin_lock_irqsave(&stats_dev->stats_lock, flags); list_add_tail(&stats_buf->queue, &stats_dev->stat); - mutex_unlock(&stats_dev->wq_lock); + spin_unlock_irqrestore(&stats_dev->stats_lock, flags); } static int rkisp1_stats_vb2_buf_prepare(struct vb2_buffer *vb) @@ -156,13 +157,13 @@ static void rkisp1_stats_vb2_stop_streaming(struct vb2_queue *vq) unsigned int i; /* Make sure no new work queued in isr before draining wq */ - spin_lock_irqsave(&stats->irq_lock, flags); + spin_lock_irqsave(&stats->stats_lock, flags); stats->is_streaming = false; - spin_unlock_irqrestore(&stats->irq_lock, flags); + spin_unlock_irqrestore(&stats->stats_lock, flags); drain_workqueue(stats->readout_wq); - mutex_lock(&stats->wq_lock); + spin_lock_irqsave(&stats->stats_lock, flags); for (i = 0; i < RKISP1_ISP_STATS_REQ_BUFS_MAX; i++) { if (list_empty(&stats->stat)) break; @@ -171,7 +172,7 @@ static void rkisp1_stats_vb2_stop_streaming(struct vb2_queue *vq) list_del(&buf->queue); vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); } - mutex_unlock(&stats->wq_lock); + spin_unlock_irqrestore(&stats->stats_lock, flags); } static int @@ -333,6 +334,7 @@ rkisp1_stats_send_measurement(struct rkisp1_stats *stats, unsigned int frame_sequence = atomic_read(&stats->rkisp1->isp.frame_sequence); u64 timestamp = ktime_get_ns(); + unsigned long flags; if (frame_sequence != meas_work->frame_id) { dev_warn(stats->rkisp1->dev, @@ -341,14 +343,14 @@ rkisp1_stats_send_measurement(struct rkisp1_stats *stats, frame_sequence = meas_work->frame_id; } - mutex_lock(&stats->wq_lock); + spin_lock_irqsave(&stats->stats_lock, flags); /* get one empty buffer */ if (!list_empty(&stats->stat)) { cur_buf = list_first_entry(&stats->stat, struct rkisp1_buffer, queue); list_del(&cur_buf->queue); } - mutex_unlock(&stats->wq_lock); + spin_unlock_irqrestore(&stats->stats_lock, flags); if (!cur_buf) return; @@ -406,7 +408,7 @@ void rkisp1_stats_isr(struct rkisp1_stats *stats, u32 isp_ris) unsigned long flags; u32 val; - spin_lock_irqsave(&stats->irq_lock, flags); + spin_lock_irqsave(&stats->stats_lock, flags); val = RKISP1_STATS_MEAS_MASK; rkisp1_write(rkisp1, val, RKISP1_CIF_ISP_ICR); @@ -436,7 +438,7 @@ void rkisp1_stats_isr(struct rkisp1_stats *stats, u32 isp_ris) } unlock: - spin_unlock_irqrestore(&stats->irq_lock, flags); + spin_unlock_irqrestore(&stats->stats_lock, flags); } static void rkisp1_init_stats(struct rkisp1_stats *stats) @@ -456,10 +458,9 @@ int rkisp1_stats_register(struct rkisp1_stats *stats, int ret; stats->rkisp1 = rkisp1; - mutex_init(&stats->wq_lock); mutex_init(&node->vlock); INIT_LIST_HEAD(&stats->stat); - spin_lock_init(&stats->irq_lock); + spin_lock_init(&stats->stats_lock); strscpy(vdev->name, RKISP1_STATS_DEV_NAME, sizeof(vdev->name)); @@ -506,7 +507,6 @@ int rkisp1_stats_register(struct rkisp1_stats *stats, err_release_queue: vb2_queue_release(vdev->queue); mutex_destroy(&node->vlock); - mutex_destroy(&stats->wq_lock); return ret; } @@ -520,5 +520,4 @@ void rkisp1_stats_unregister(struct rkisp1_stats *stats) media_entity_cleanup(&vdev->entity); vb2_queue_release(vdev->queue); mutex_destroy(&node->vlock); - mutex_destroy(&stats->wq_lock); }