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[23.128.96.18]) by mx.google.com with ESMTP id dh25si6101321edb.8.2020.08.07.14.18.43; Fri, 07 Aug 2020 14:19:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=PWwhGBch; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726481AbgHGVRT (ORCPT + 99 others); Fri, 7 Aug 2020 17:17:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbgHGVRS (ORCPT ); Fri, 7 Aug 2020 17:17:18 -0400 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8ABE8C061756 for ; Fri, 7 Aug 2020 14:17:18 -0700 (PDT) Received: by mail-pg1-x543.google.com with SMTP id 128so1605223pgd.5 for ; Fri, 07 Aug 2020 14:17:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=mTi25uKDeno+kjIGWxKtG9bnSzwH+0hK7ejqxU/R1EA=; b=PWwhGBchg2tJbjQiYkAtlcJdXTvewWyYBMHTHHrKFz2Px+GJ5NXCZfJ7x5pG3p5K8c 6FhQTKgwg48cZFRfGsdGe6mYPYH2dLTU+qCzpRfJXDHU5jT/bH8VyQUZ0ngvIIGG13my ZUjFuSEKUTRIoUtwlx+fekBRDEZLzvdAKhTPtX25rUOj36ZEdkgbf4Q4wCEDvVJFIaNr dlUloyzVjagzcCYchfILiAavp7KC7EMg7VwsKSCC1mQxULEK8ELFy6kIyyAi3DvhwDw7 PS8cGJVHwjXzWUpcVHd2RLZK19nTPA/gSYq50xrZM2aQAAWBDiWFrgxiWaq2F/OXVfoV uYEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=mTi25uKDeno+kjIGWxKtG9bnSzwH+0hK7ejqxU/R1EA=; b=dqfh1Qv/gPkafZYHM9dIiIWFS35eP3pJR68FqCDy4qK4WbA6cjvjQfs3JEnf90vyTn kvYm4xZWMgucRpmSXcpee2JM7Bpco2U8JjBw0T/vjYHgHkVFe/ItVC6CYvX09b+wo0RI 2m8G6HCpkhREZs3ELisOi3vcvyr58A/1oFv9LK8p/b2pQI6IIm1HZd0+P06mL0MbgbGv QLOA3fDJDV/n6xYzPA6fijbkrLV+sMJUl77OW7KWl8Vi6MJhpRWeeO/XSaKHMX2ouF/D y027BJUjEfM8RhzxNu6LqFzyJUbP+aLJESyH08zmyIGdxegeRy1TAJzs5h7vH08gq/10 9Ugw== X-Gm-Message-State: AOAM533VuE46sssAlNUZtB31JxapFC8GEbW0hBhauqUnujzz4P6+Cn8b 49eYHZVMsFAhLFmpDEYAK24= X-Received: by 2002:a62:62c5:: with SMTP id w188mr15527675pfb.133.1596835037973; Fri, 07 Aug 2020 14:17:17 -0700 (PDT) Received: from realwakka ([61.83.141.80]) by smtp.gmail.com with ESMTPSA id i185sm4358478pgd.28.2020.08.07.14.17.13 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 07 Aug 2020 14:17:17 -0700 (PDT) Date: Fri, 7 Aug 2020 21:17:00 +0000 From: Sidong Yang To: Melissa Wen , Rodrigo Siqueira , Haneen Mohammed , David Airlie , LKML , DRI Development Cc: Rodrigo Siqueira , Haneen Mohammed , Daniel Vetter , David Airlie , LKML , DRI Development Subject: Re: [PATCH] drm/vkms: modify sequence disable/plane/enable in commit_tail Message-ID: <20200807211700.GA30117@realwakka> References: <20200729152231.13249-1-realwakka@gmail.com> <20200804093351.GI6419@phenom.ffwll.local> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200804093351.GI6419@phenom.ffwll.local> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 04, 2020 at 11:33:51AM +0200, daniel@ffwll.ch wrote: > On Sat, Aug 01, 2020 at 04:30:23PM -0300, Melissa Wen wrote: > > On Wed, Jul 29, 2020 at 12:22 PM Sidong Yang wrote: > > > > > > This patch modifies function call sequence in commit tail. This is for > > > the problem that raised when kms_cursor_crc test is tested repeatedly. > > > In second test, there is an bug that crtc commit doesn't start vblank events. > > > Because there is some error about vblank's refcount. in commit_flush() that > > > called from commit_plane, drm_vblank_get() is called and vblank is enabled > > > in normal case. But in second test, vblank isn't enable for vblank->refcount > > > is already increased in previous test. Increased refcount will be decreased > > > in drm_atomic_helper_commit_modeset_enables() after commit_plane. > > > Therefore, commit_plane should be called after commit_modeset_enable. > > > > > > In this situation, there is a warning raised in get_vblank_timestamp(). > > > hrtimer.node.expires and vblank->time are zero for no vblank events before. > > > This patch returns current time when vblank is not enabled. > > > > > Hi Sidong, > > > > I think this patch tries to solve two different issues. > > > > I am not a maintainer, but I believe you can split it. > > > > Everything indicates that changing the commit tail sequence does not > > ideally solve the problem of subtests getting stuck (as we have dicussed); > > however, for me, the treatment of the warning is valid and it is also related > > to other IGT tests using VKMS. > > Yeah I think (but haven't tested, definitely need to confirm that) that > the vblank get/put fix from Melissa is the correct fix for all these > issues. > > > One option is to send a patch that only treats the warning. I believe that > > in the body of the commit message, it would be nice to have the warning > > that this patch addresses, and when it appears by running an IGT test. > > Also, say why it should be done this way in vkms. > > This info could help future debugging. > > Yeah I think splitting out the warning fix is the right thing to do here. Okay, I'll write another patch about the warning. Thanks. -Sidong > -Daniel > > > > > Off-topic: I removed the group's mailing list of the University of S?o > > Paulo (kernel-usp) from the cc, since I believe you had no intention of > > sending the patch to them. > > > > Best regards, > > > > Melissa > > > > > Cc: Daniel Vetter > > > Cc: Rodrigo Siqueira > > > Cc: Haneen Mohammed > > > > > > Signed-off-by: Sidong Yang > > > --- > > > drivers/gpu/drm/vkms/vkms_crtc.c | 5 +++++ > > > drivers/gpu/drm/vkms/vkms_drv.c | 4 ++-- > > > 2 files changed, 7 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c > > > index ac85e17428f8..09c012d54d58 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_crtc.c > > > +++ b/drivers/gpu/drm/vkms/vkms_crtc.c > > > @@ -86,6 +86,11 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc, > > > struct vkms_output *output = &vkmsdev->output; > > > struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; > > > > > > + if (!READ_ONCE(vblank->enabled)) { > > > + *vblank_time = ktime_get(); > > > + return true; > > > + } > > > + > > > *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires); > > > > > > if (WARN_ON(*vblank_time == vblank->time)) > > > diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c > > > index 1e8b2169d834..c2c83a01d4a7 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_drv.c > > > +++ b/drivers/gpu/drm/vkms/vkms_drv.c > > > @@ -76,10 +76,10 @@ static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state) > > > > > > drm_atomic_helper_commit_modeset_disables(dev, old_state); > > > > > > - drm_atomic_helper_commit_planes(dev, old_state, 0); > > > - > > > drm_atomic_helper_commit_modeset_enables(dev, old_state); > > > > > > + drm_atomic_helper_commit_planes(dev, old_state, 0); > > > + > > > drm_atomic_helper_fake_vblank(old_state); > > > > > > drm_atomic_helper_commit_hw_done(old_state); > > > -- > > > 2.17.1 > > > > > > -- > > > You received this message because you are subscribed to the Google Groups "Kernel USP" group. > > > To unsubscribe from this group and stop receiving emails from it, send an email to kernel-usp+unsubscribe@googlegroups.com. > > > To view this discussion on the web visit https://groups.google.com/d/msgid/kernel-usp/20200729152231.13249-1-realwakka%40gmail.com. > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch