From patchwork Wed Feb 20 21:03:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Anholt X-Patchwork-Id: 10822729 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B710D6C2 for ; Wed, 20 Feb 2019 21:04:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A4989287C2 for ; Wed, 20 Feb 2019 21:04:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 98FA52C118; Wed, 20 Feb 2019 21:04:06 +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=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 29A95287C2 for ; Wed, 20 Feb 2019 21:04:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 063FC8932D; Wed, 20 Feb 2019 21:04:05 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from anholt.net (anholt.net [50.246.234.109]) by gabe.freedesktop.org (Postfix) with ESMTP id 932D489319 for ; Wed, 20 Feb 2019 21:04:00 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id 67DC310A2D1A; Wed, 20 Feb 2019 13:04:00 -0800 (PST) X-Virus-Scanned: Debian amavisd-new at anholt.net Received: from anholt.net ([127.0.0.1]) by localhost (kingsolver.anholt.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id ccMDZ6pZAjhx; Wed, 20 Feb 2019 13:03:57 -0800 (PST) Received: from eliezer.anholt.net (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id 2993710A2D22; Wed, 20 Feb 2019 13:03:46 -0800 (PST) Received: by eliezer.anholt.net (Postfix, from userid 1000) id AA42E2FE4651; Wed, 20 Feb 2019 13:03:43 -0800 (PST) From: Eric Anholt To: dri-devel@lists.freedesktop.org Subject: [PATCH 6/7] drm/vc4: Add helpers for pm get/put. Date: Wed, 20 Feb 2019 13:03:42 -0800 Message-Id: <20190220210343.28157-6-eric@anholt.net> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190220210343.28157-1-eric@anholt.net> References: <20190220210343.28157-1-eric@anholt.net> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Kocialkowski , Maxime Ripard , linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP This makes sure the vc4_reset doesn't hit an obscure race with the GET_PARAM ioctl, fixes a decrement outside of the lock, and prevents future code from making mistakes with the weird return value of pm_runtime_get_sync(). Signed-off-by: Eric Anholt Reviewed-by: Paul Kocialkowski --- drivers/gpu/drm/vc4/vc4_drv.c | 21 +++++++++------------ drivers/gpu/drm/vc4/vc4_drv.h | 2 ++ drivers/gpu/drm/vc4/vc4_gem.c | 21 +++++---------------- drivers/gpu/drm/vc4/vc4_v3d.c | 33 +++++++++++++++++++++++++++++++++ 4 files changed, 49 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c index de1d0ce11831..f95891a61d52 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.c +++ b/drivers/gpu/drm/vc4/vc4_drv.c @@ -77,28 +77,25 @@ static int vc4_get_param_ioctl(struct drm_device *dev, void *data, switch (args->param) { case DRM_VC4_PARAM_V3D_IDENT0: - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) + ret = vc4_v3d_pm_get(vc4); + if (ret) return ret; args->value = V3D_READ(V3D_IDENT0); - pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); - pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); + vc4_v3d_pm_put(vc4); break; case DRM_VC4_PARAM_V3D_IDENT1: - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) + ret = vc4_v3d_pm_get(vc4); + if (ret) return ret; args->value = V3D_READ(V3D_IDENT1); - pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); - pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); + vc4_v3d_pm_put(vc4); break; case DRM_VC4_PARAM_V3D_IDENT2: - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) + ret = vc4_v3d_pm_get(vc4); + if (ret) return ret; args->value = V3D_READ(V3D_IDENT2); - pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); - pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); + vc4_v3d_pm_put(vc4); break; case DRM_VC4_PARAM_SUPPORTS_BRANCHES: case DRM_VC4_PARAM_SUPPORTS_ETC1: diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index 495c5a13a948..c71988b270bc 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -809,6 +809,8 @@ void vc4_plane_async_set_fb(struct drm_plane *plane, /* vc4_v3d.c */ extern struct platform_driver vc4_v3d_driver; int vc4_v3d_get_bin_slot(struct vc4_dev *vc4); +int vc4_v3d_pm_get(struct vc4_dev *vc4); +void vc4_v3d_pm_put(struct vc4_dev *vc4); /* vc4_validate.c */ int diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index 8d816e5ed762..4544a478f106 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -969,12 +969,7 @@ vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec) /* Release the reference we had on the perf monitor. */ vc4_perfmon_put(exec->perfmon); - mutex_lock(&vc4->power_lock); - if (--vc4->power_refcount == 0) { - pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); - pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); - } - mutex_unlock(&vc4->power_lock); + vc4_v3d_pm_put(vc4); kfree(exec); } @@ -1153,17 +1148,11 @@ vc4_submit_cl_ioctl(struct drm_device *dev, void *data, return -ENOMEM; } - mutex_lock(&vc4->power_lock); - if (vc4->power_refcount++ == 0) { - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) { - mutex_unlock(&vc4->power_lock); - vc4->power_refcount--; - kfree(exec); - return ret; - } + ret = vc4_v3d_pm_get(vc4); + if (ret) { + kfree(exec); + return ret; } - mutex_unlock(&vc4->power_lock); exec->args = args; INIT_LIST_HEAD(&exec->unref_list); diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c index f008584eb739..7820b8eaaa98 100644 --- a/drivers/gpu/drm/vc4/vc4_v3d.c +++ b/drivers/gpu/drm/vc4/vc4_v3d.c @@ -124,6 +124,39 @@ static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused) return 0; } +/** + * Wraps pm_runtime_get_sync() in a refcount, so that we can reliably + * get the pm_runtime refcount to 0 in vc4_reset(). + */ +int +vc4_v3d_pm_get(struct vc4_dev *vc4) +{ + mutex_lock(&vc4->power_lock); + if (vc4->power_refcount++ == 0) { + int ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); + + if (ret < 0) { + vc4->power_refcount--; + mutex_unlock(&vc4->power_lock); + return ret; + } + } + mutex_unlock(&vc4->power_lock); + + return 0; +} + +void +vc4_v3d_pm_put(struct vc4_dev *vc4) +{ + mutex_lock(&vc4->power_lock); + if (--vc4->power_refcount == 0) { + pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); + pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); + } + mutex_unlock(&vc4->power_lock); +} + static void vc4_v3d_init_hw(struct drm_device *dev) { struct vc4_dev *vc4 = to_vc4_dev(dev);