From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EC7EC11F68 for ; Wed, 30 Jun 2021 06:28:24 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 2BAA861D0B for ; Wed, 30 Jun 2021 06:28:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2BAA861D0B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 91FD56E933; Wed, 30 Jun 2021 06:28:18 +0000 (UTC) Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9794A6E92F for ; Wed, 30 Jun 2021 06:28:06 +0000 (UTC) Received: from localhost.localdomain (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id D4A761F431AF; Wed, 30 Jun 2021 07:28:04 +0100 (BST) From: Boris Brezillon To: dri-devel@lists.freedesktop.org Subject: [PATCH v6 08/16] drm/panfrost: Use a threaded IRQ for job interrupts Date: Wed, 30 Jun 2021 08:27:43 +0200 Message-Id: <20210630062751.2832545-9-boris.brezillon@collabora.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210630062751.2832545-1-boris.brezillon@collabora.com> References: <20210630062751.2832545-1-boris.brezillon@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: , Cc: Tomeu Vizoso , Steven Price , Rob Herring , Alyssa Rosenzweig , Boris Brezillon , Robin Murphy Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This should avoid switching to interrupt context when the GPU is under heavy use. v3: * Don't take the job_lock in panfrost_job_handle_irq() Signed-off-by: Boris Brezillon Acked-by: Alyssa Rosenzweig Reviewed-by: Steven Price --- drivers/gpu/drm/panfrost/panfrost_job.c | 53 ++++++++++++++++++------- 1 file changed, 38 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index 12285a285765..6149e4c7133f 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -459,19 +459,12 @@ static const struct drm_sched_backend_ops panfrost_sched_ops = { .free_job = panfrost_job_free }; -static irqreturn_t panfrost_job_irq_handler(int irq, void *data) +static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status) { - struct panfrost_device *pfdev = data; - u32 status = job_read(pfdev, JOB_INT_STAT); int j; dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status); - if (!status) - return IRQ_NONE; - - pm_runtime_mark_last_busy(pfdev->dev); - for (j = 0; status; j++) { u32 mask = MK_JS_MASK(j); @@ -508,7 +501,6 @@ static irqreturn_t panfrost_job_irq_handler(int irq, void *data) if (status & JOB_INT_MASK_DONE(j)) { struct panfrost_job *job; - spin_lock(&pfdev->js->job_lock); job = pfdev->jobs[j]; /* Only NULL if job timeout occurred */ if (job) { @@ -520,21 +512,49 @@ static irqreturn_t panfrost_job_irq_handler(int irq, void *data) dma_fence_signal_locked(job->done_fence); pm_runtime_put_autosuspend(pfdev->dev); } - spin_unlock(&pfdev->js->job_lock); } status &= ~mask; } +} +static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data) +{ + struct panfrost_device *pfdev = data; + u32 status = job_read(pfdev, JOB_INT_RAWSTAT); + + while (status) { + pm_runtime_mark_last_busy(pfdev->dev); + + spin_lock(&pfdev->js->job_lock); + panfrost_job_handle_irq(pfdev, status); + spin_unlock(&pfdev->js->job_lock); + status = job_read(pfdev, JOB_INT_RAWSTAT); + } + + job_write(pfdev, JOB_INT_MASK, + GENMASK(16 + NUM_JOB_SLOTS - 1, 16) | + GENMASK(NUM_JOB_SLOTS - 1, 0)); return IRQ_HANDLED; } +static irqreturn_t panfrost_job_irq_handler(int irq, void *data) +{ + struct panfrost_device *pfdev = data; + u32 status = job_read(pfdev, JOB_INT_STAT); + + if (!status) + return IRQ_NONE; + + job_write(pfdev, JOB_INT_MASK, 0); + return IRQ_WAKE_THREAD; +} + static void panfrost_reset(struct work_struct *work) { struct panfrost_device *pfdev = container_of(work, struct panfrost_device, reset.work); - unsigned long flags; unsigned int i; bool cookie; @@ -564,7 +584,7 @@ static void panfrost_reset(struct work_struct *work) /* All timers have been stopped, we can safely reset the pending state. */ atomic_set(&pfdev->reset.pending, 0); - spin_lock_irqsave(&pfdev->js->job_lock, flags); + spin_lock(&pfdev->js->job_lock); for (i = 0; i < NUM_JOB_SLOTS; i++) { if (pfdev->jobs[i]) { pm_runtime_put_noidle(pfdev->dev); @@ -572,7 +592,7 @@ static void panfrost_reset(struct work_struct *work) pfdev->jobs[i] = NULL; } } - spin_unlock_irqrestore(&pfdev->js->job_lock, flags); + spin_unlock(&pfdev->js->job_lock); panfrost_device_reset(pfdev); @@ -599,8 +619,11 @@ int panfrost_job_init(struct panfrost_device *pfdev) if (irq <= 0) return -ENODEV; - ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler, - IRQF_SHARED, KBUILD_MODNAME "-job", pfdev); + ret = devm_request_threaded_irq(pfdev->dev, irq, + panfrost_job_irq_handler, + panfrost_job_irq_handler_thread, + IRQF_SHARED, KBUILD_MODNAME "-job", + pfdev); if (ret) { dev_err(pfdev->dev, "failed to request job irq"); return ret; -- 2.31.1