From patchwork Tue Sep 27 15:50:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tobias Jakobi X-Patchwork-Id: 9352131 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DE4DE6077B for ; Tue, 27 Sep 2016 15:51:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CFDF5291F2 for ; Tue, 27 Sep 2016 15:51:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C4E182928A; Tue, 27 Sep 2016 15:51:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5856C291F2 for ; Tue, 27 Sep 2016 15:51:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933907AbcI0Pvj (ORCPT ); Tue, 27 Sep 2016 11:51:39 -0400 Received: from smtp.math.uni-bielefeld.de ([129.70.45.10]:40850 "EHLO smtp.math.uni-bielefeld.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934109AbcI0Pvj (ORCPT ); Tue, 27 Sep 2016 11:51:39 -0400 Received: from chidori.dhcp.uni-bielefeld.de (unknown [10.68.161.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (Client did not present a certificate) by smtp.math.uni-bielefeld.de (Postfix) with ESMTPSA id 7EC055F61A; Tue, 27 Sep 2016 17:51:35 +0200 (CEST) From: Tobias Jakobi To: linux-samsung-soc@vger.kernel.org Cc: dri-devel@lists.freedesktop.org, m.szyprowski@samsung.com, inki.dae@samsung.com, Tobias Jakobi Subject: [PATCH 2/6] drm/exynos: g2d: move PM management to runqueue worker Date: Tue, 27 Sep 2016 17:50:07 +0200 Message-Id: <1474991411-2937-3-git-send-email-tjakobi@math.uni-bielefeld.de> X-Mailer: git-send-email 2.7.3 In-Reply-To: <1474991411-2937-1-git-send-email-tjakobi@math.uni-bielefeld.de> References: <1474991411-2937-1-git-send-email-tjakobi@math.uni-bielefeld.de> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Do all pm_runtime_{get,put}() calls in the runqueue worker. Also keep track of the engine's idle/busy state. Signed-off-by: Tobias Jakobi --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 78 +++++++++++++++++++++++---------- 1 file changed, 56 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 4bf00f5..eda385a 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -138,6 +138,18 @@ enum g2d_reg_type { MAX_REG_TYPE_NR }; +enum g2d_flag_bits { + /* + * If set, suspends the runqueue worker after the currently + * processed node is finished. + */ + G2D_BIT_SUSPEND_RUNQUEUE, + /* + * If set, indicates that the engine is currently busy. + */ + G2D_BIT_ENGINE_BUSY, +}; + /* cmdlist data structure */ struct g2d_cmdlist { u32 head; @@ -226,7 +238,7 @@ struct g2d_data { struct workqueue_struct *g2d_workq; struct work_struct runqueue_work; struct exynos_drm_subdrv subdrv; - bool suspended; + unsigned long flags; /* cmdlist */ struct g2d_cmdlist_node *cmdlist_node; @@ -803,12 +815,8 @@ static void g2d_dma_start(struct g2d_data *g2d, struct g2d_cmdlist_node *node = list_first_entry(&runqueue_node->run_cmdlist, struct g2d_cmdlist_node, list); - int ret; - - ret = pm_runtime_get_sync(g2d->dev); - if (ret < 0) - return; + set_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags); writel_relaxed(node->dma_addr, g2d->regs + G2D_DMA_SFR_BASE_ADDR); writel_relaxed(G2D_DMA_START, g2d->regs + G2D_DMA_COMMAND); } @@ -858,18 +866,37 @@ static void g2d_runqueue_worker(struct work_struct *work) { struct g2d_data *g2d = container_of(work, struct g2d_data, runqueue_work); + struct g2d_runqueue_node *runqueue_node; + + /* + * The engine is busy and the completion of the current node is going + * to poke the runqueue worker, so nothing to do here. + */ + if (test_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags)) + return; mutex_lock(&g2d->runqueue_mutex); - pm_runtime_put_sync(g2d->dev); - complete(&g2d->runqueue_node->complete); - if (g2d->runqueue_node->async) - g2d_free_runqueue_node(g2d, g2d->runqueue_node); + runqueue_node = g2d->runqueue_node; + g2d->runqueue_node = NULL; + + if (runqueue_node) { + pm_runtime_put(g2d->dev); + + complete(&runqueue_node->complete); + if (runqueue_node->async) + g2d_free_runqueue_node(g2d, runqueue_node); + } + + if (!test_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags)) { + g2d->runqueue_node = g2d_get_runqueue_node(g2d); + + if (g2d->runqueue_node) { + pm_runtime_get_sync(g2d->dev); + g2d_dma_start(g2d, g2d->runqueue_node); + } + } - if (g2d->suspended) - g2d->runqueue_node = NULL; - else - g2d_exec_runqueue(g2d); mutex_unlock(&g2d->runqueue_mutex); } @@ -918,8 +945,10 @@ static irqreturn_t g2d_irq_handler(int irq, void *dev_id) } } - if (pending & G2D_INTP_ACMD_FIN) + if (pending & G2D_INTP_ACMD_FIN) { + clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags); queue_work(g2d->g2d_workq, &g2d->runqueue_work); + } return IRQ_HANDLED; } @@ -1259,10 +1288,11 @@ int exynos_g2d_exec_ioctl(struct drm_device *drm_dev, void *data, runqueue_node->pid = current->pid; runqueue_node->filp = file; list_add_tail(&runqueue_node->list, &g2d->runqueue); - if (!g2d->runqueue_node) - g2d_exec_runqueue(g2d); mutex_unlock(&g2d->runqueue_mutex); + /* Let the runqueue know that there is work to do. */ + queue_work(g2d->g2d_workq, &g2d->runqueue_work); + if (runqueue_node->async) goto out; @@ -1400,6 +1430,8 @@ static int g2d_probe(struct platform_device *pdev) } pm_runtime_enable(dev); + clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags); + clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -1458,6 +1490,9 @@ static int g2d_remove(struct platform_device *pdev) { struct g2d_data *g2d = platform_get_drvdata(pdev); + /* Suspend runqueue operation. */ + set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags); + cancel_work_sync(&g2d->runqueue_work); exynos_drm_subdrv_unregister(&g2d->subdrv); @@ -1480,9 +1515,8 @@ static int g2d_suspend(struct device *dev) { struct g2d_data *g2d = dev_get_drvdata(dev); - mutex_lock(&g2d->runqueue_mutex); - g2d->suspended = true; - mutex_unlock(&g2d->runqueue_mutex); + /* Suspend runqueue operation. */ + set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags); while (g2d->runqueue_node) /* FIXME: good range? */ @@ -1497,8 +1531,8 @@ static int g2d_resume(struct device *dev) { struct g2d_data *g2d = dev_get_drvdata(dev); - g2d->suspended = false; - g2d_exec_runqueue(g2d); + clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags); + queue_work(g2d->g2d_workq, &g2d->runqueue_work); return 0; }