From patchwork Fri Dec 6 13:12:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ma=C3=ADra_Canal?= X-Patchwork-Id: 13897215 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 39088E77173 for ; Fri, 6 Dec 2024 13:17:40 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EAC1A10F0D5; Fri, 6 Dec 2024 13:17:38 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=igalia.com header.i=@igalia.com header.b="N1mHhMaE"; dkim-atps=neutral Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5032210F0D5 for ; Fri, 6 Dec 2024 13:17:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=SINW3DKIYuMLtUwv00EkdgQxf7jWNB9RNblxSXozEpM=; b=N1mHhMaEZ6jp4UYyK2z/m81bQh kGvmkVXV/wqqeaO28rrrBUB3AycLqlTznXh1cpw5AXtmRM1FhH+FYjKTcMKhCmGSApH8h37OcPxlo fkPbpA8Rkl92fII1GuQ4ilXId7y6dOorikaboEPR7/HsBtJF3jIkZjjd8B+C5QP4C1LBSKK6eqdVR UD7mbEirxjTTVLdFr0Spz+G/7fOZ1LudTOgoOZQWaczHOyhKQ4TsdpxnYiwMShPKwe0BdA2ElGj// Ad0NzI+k4HOsN+8adse2rJLzgJn9bmI3Q7EqknOb1mRMAnmxuQlGpum2vF2+C+QFj/z5r+CFHkJac RATAHvdA==; Received: from [187.36.213.55] (helo=morissey..) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1tJYD3-00HQHu-H7; Fri, 06 Dec 2024 14:17:30 +0100 From: =?utf-8?q?Ma=C3=ADra_Canal?= To: Melissa Wen , Maxime Ripard , Dave Stevenson , =?utf-8?q?Christian_K?= =?utf-8?q?=C3=B6nig?= , Tvrtko Ursulin , Simona Vetter Cc: dri-devel@lists.freedesktop.org, kernel-dev@igalia.com, =?utf-8?q?Ma?= =?utf-8?q?=C3=ADra_Canal?= Subject: [PATCH 2/4] drm/vc4: Use DMA Resv to implement VC4 wait BO IOCTL Date: Fri, 6 Dec 2024 10:12:35 -0300 Message-ID: <20241206131706.203324-3-mcanal@igalia.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241206131706.203324-1-mcanal@igalia.com> References: <20241206131706.203324-1-mcanal@igalia.com> MIME-Version: 1.0 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" As the BOs used by VC4 have DMA Reservation Objects attached to it, there is no need to use seqnos wait for the BOs availability. Instead, we can use `dma_gem_dma_resv_wait()`. Signed-off-by: Maíra Canal --- drivers/gpu/drm/vc4/vc4_drv.h | 10 ++++++++++ drivers/gpu/drm/vc4/vc4_gem.c | 31 +++++++++++++++++++------------ 2 files changed, 29 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index 4a078ffd9f82..03ed40ab9a93 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -924,6 +924,16 @@ struct vc4_validated_shader_info { (Wmax)) #define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000) +static inline unsigned long nsecs_to_jiffies_timeout(const u64 n) +{ + /* nsecs_to_jiffies64() does not guard against overflow */ + if ((NSEC_PER_SEC % HZ) != 0 && + div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ) + return MAX_JIFFY_OFFSET; + + return min_t(u64, MAX_JIFFY_OFFSET, nsecs_to_jiffies64(n) + 1); +} + /* vc4_bo.c */ struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size); struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size, diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index 2e5477b1c73a..256af016ade0 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -1022,11 +1022,13 @@ int vc4_wait_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { - struct vc4_dev *vc4 = to_vc4_dev(dev); int ret; + struct vc4_dev *vc4 = to_vc4_dev(dev); struct drm_vc4_wait_bo *args = data; - struct drm_gem_object *gem_obj; - struct vc4_bo *bo; + unsigned long timeout_jiffies = + nsecs_to_jiffies_timeout(args->timeout_ns); + ktime_t start = ktime_get(); + u64 delta_ns; if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4)) return -ENODEV; @@ -1034,17 +1036,22 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data, if (args->pad != 0) return -EINVAL; - gem_obj = drm_gem_object_lookup(file_priv, args->handle); - if (!gem_obj) { - DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); - return -EINVAL; - } - bo = to_vc4_bo(gem_obj); + ret = drm_gem_dma_resv_wait(file_priv, args->handle, + true, timeout_jiffies); - ret = vc4_wait_for_seqno_ioctl_helper(dev, bo->seqno, - &args->timeout_ns); + /* Decrement the user's timeout, in case we got interrupted + * such that the ioctl will be restarted. + */ + delta_ns = ktime_to_ns(ktime_sub(ktime_get(), start)); + if (delta_ns < args->timeout_ns) + args->timeout_ns -= delta_ns; + else + args->timeout_ns = 0; + + /* Asked to wait beyond the jiffy/scheduler precision? */ + if (ret == -ETIME && args->timeout_ns) + ret = -EAGAIN; - drm_gem_object_put(gem_obj); return ret; }