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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 917FDC433E0 for ; Tue, 2 Jun 2020 09:44:18 +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 6235920679 for ; Tue, 2 Jun 2020 09:44:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="HmiyDfEv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6235920679 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 52C9A89D8A; Tue, 2 Jun 2020 09:44:14 +0000 (UTC) Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) by gabe.freedesktop.org (Postfix) with ESMTPS id 811A889D30 for ; Tue, 2 Jun 2020 09:44:12 +0000 (UTC) Received: by mail-wm1-x344.google.com with SMTP id r9so2249001wmh.2 for ; Tue, 02 Jun 2020 02:44:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=8V4rZjkqzHFTF/LdSJ1CXEfhWY+0KxmQTLgE0KPDAPk=; b=HmiyDfEv9Vosd0Oh13UMtNtQaMWM61T0tuJJXOyayMZV5+dbsQqwW4YOuX4+D82ZLo 9M0IfhfHzRi3WdG7Kxx8Rwaq6EOKKbzwOGR1p9tY32qfkHq+V99O/zgVmMlRMrWBCkGw cSIzg4utAQv6XmknYb31XoPkhNaCIFevqzVSY= 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:in-reply-to; bh=8V4rZjkqzHFTF/LdSJ1CXEfhWY+0KxmQTLgE0KPDAPk=; b=MBrEl/Ishs0zAR/hQ7Wk5ilhoxSgysF/QXZKjrGpGMOwMxzOCBTuDSEhdCgVSgdDBw eH8JhxFUvEHiqppJlmX5YsnRkTYj/iJU7+u0Dc2SvPRM6Z1vX4Fcw05WGEDczjpjG3C2 D68BnopdU877jUCm527MzSNfKgjC5VYdn4zDjlrg8NoOTev6kBq77Np2WywLfHarntHY Fy0lJbRvYzLb0A9/slvtCLqq//0TCabebdO7D181wsT1jiorIHQ9uIrtfeva9FZF4gO0 psQpoZxXsixBI6Ohhspm2xp9mALqr44p5ldy0P3nJf/YDDD6RJDcPyp90hXNkfBBWDzQ l20A== X-Gm-Message-State: AOAM531OmItabgTcpczNCVR8/7osLaxhg+a/zd+CRZCy/zEU6gEQzaKG v9IN1e12aAeJ2M2P3SWMvD75xQ== X-Google-Smtp-Source: ABdhPJwhQEsdXlr1T3ABytxbhkw8yhfN1roTCqU8ktSIqGj3glB7A3uYgFR7fqgtSWkTc706ESA+sQ== X-Received: by 2002:a1c:38c2:: with SMTP id f185mr3512820wma.79.1591091051047; Tue, 02 Jun 2020 02:44:11 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id k17sm2989541wrl.54.2020.06.02.02.44.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2020 02:44:10 -0700 (PDT) Date: Tue, 2 Jun 2020 11:43:59 +0200 From: Daniel Vetter To: Laurent Pinchart Message-ID: <20200602094359.GA20149@phenom.ffwll.local> References: <20200527094757.1414174-2-daniel.vetter@ffwll.ch> <20200527095332.1439425-1-daniel.vetter@ffwll.ch> <20200530032258.GD5961@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200530032258.GD5961@pendragon.ideasonboard.com> X-Operating-System: Linux phenom 5.6.0-1-amd64 Subject: Re: [Intel-gfx] [PATCH] drm/atomic-helper: reset vblank on crtc reset X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Belloni , Tetsuo Handa , Daniel Vetter , DRI Development , Daniel Vetter , Mihail Atanassov , Sam Ravnborg , Emil Velikov , Jonathan Hunter , David Airlie , Ludovic Desroches , Tomi Valkeinen , "James \(Qian\) Wang" , syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com, Intel Graphics Development , Jyri Sarha , Sean Paul , linux-tegra@vger.kernel.org, Thomas Gleixner , Boris Brezillon , Nicolas Ferre , zhengbin , Thomas Zimmermann , Brian Masney Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Sat, May 30, 2020 at 06:22:58AM +0300, Laurent Pinchart wrote: > Hi Daniel, > > Thank you for the patch. > > On Wed, May 27, 2020 at 11:53:32AM +0200, Daniel Vetter wrote: > > Only when vblanks are supported ofc. > > > > Some drivers do this already, but most unfortunately missed it. This > > opens up bugs after driver load, before the crtc is enabled for the > > first time. syzbot spotted this when loading vkms as a secondary > > output. Given how many drivers are buggy it's best to solve this once > > and for all in shared helper code. > > > > Aside from moving the few existing calls to drm_crtc_vblank_reset into > > helpers (i915 doesn't use helpers, so keeps its own) I think the > > regression risk is minimal: atomic helpers already rely on drivers > > calling drm_crtc_vblank_on/off correctly in their hooks when they > > support vblanks. And driver that's failing to handle vblanks after > > this is missing those calls already, and vblanks could only work by > > accident when enabling a CRTC for the first time right after boot. > > > > Big thanks to Tetsuo for helping track down what's going wrong here. > > > > There's only a few drivers which already had the necessary call and > > needed some updating: > > - komeda, atmel and tidss also needed to be changed to call > > __drm_atomic_helper_crtc_reset() intead of open coding it > > - tegra and msm even had it in the same place already, just code > > motion, and malidp already uses __drm_atomic_helper_crtc_reset(). > > Have you intentionally not touched drivers that use > drm_crtc_vblank_off() at init time instead of drm_crtc_vblank_reset() ? > I'm thinking about omapdrm and rcar-du that both call neither > drm_crtc_vblank_reset() nor __drm_atomic_helper_crtc_reset() in their > CRTC reset handler, and call drm_crtc_vblank_off() at init time. Should > these (and likely other) drivers be updated ? Good catch, I think we should remove those too with this patch. I also used that opportunity to review all callers fo drm_crtc_vblank_off, and I found two bogus callers in malidp and hdlcd. But only in the unload code, so doesn't matter much. I'll resend a new version. -Daniel > Other than that the patch looks good to me, > > Reviewed-by: Laurent Pinchart > > > Only call left is in i915, which doesn't use drm_mode_config_reset, > > but has its own fastboot infrastructure. So that's the only case where > > we actually want this in the driver still. > > > > I've also reviewed all other drivers which set up vblank support with > > drm_vblank_init. After the previous patch fixing mxsfb all atomic > > drivers do call drm_crtc_vblank_on/off as they should, the remaining > > drivers are either legacy kms or legacy dri1 drivers, so not affected > > by this change to atomic helpers. > > > > v2: Use the drm_dev_has_vblank() helper. > > > > Link: https://syzkaller.appspot.com/bug?id=0ba17d70d062b2595e1f061231474800f076c7cb > > Reported-by: Tetsuo Handa > > Reported-by: syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com > > Cc: Tetsuo Handa > > Cc: "James (Qian) Wang" > > Cc: Liviu Dudau > > Cc: Mihail Atanassov > > Cc: Brian Starkey > > Cc: Sam Ravnborg > > Cc: Boris Brezillon > > Cc: Nicolas Ferre > > Cc: Alexandre Belloni > > Cc: Ludovic Desroches > > Cc: Maarten Lankhorst > > Cc: Maxime Ripard > > Cc: Thomas Zimmermann > > Cc: David Airlie > > Cc: Daniel Vetter > > Cc: Thierry Reding > > Cc: Jonathan Hunter > > Cc: Jyri Sarha > > Cc: Tomi Valkeinen > > Cc: Rob Clark > > Cc: Sean Paul > > Cc: Brian Masney > > Cc: Emil Velikov > > Cc: zhengbin > > Cc: Thomas Gleixner > > Cc: linux-tegra@vger.kernel.org > > Signed-off-by: Daniel Vetter > > --- > > drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 7 ++----- > > drivers/gpu/drm/arm/malidp_drv.c | 1 - > > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 7 ++----- > > drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++ > > drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 2 -- > > drivers/gpu/drm/tegra/dc.c | 1 - > > drivers/gpu/drm/tidss/tidss_crtc.c | 3 +-- > > drivers/gpu/drm/tidss/tidss_kms.c | 4 ---- > > 8 files changed, 9 insertions(+), 20 deletions(-) > > > > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c > > index 56bd938961ee..f33418d6e1a0 100644 > > --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c > > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c > > @@ -492,10 +492,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc) > > crtc->state = NULL; > > > > state = kzalloc(sizeof(*state), GFP_KERNEL); > > - if (state) { > > - crtc->state = &state->base; > > - crtc->state->crtc = crtc; > > - } > > + if (state) > > + __drm_atomic_helper_crtc_reset(crtc, &state->base); > > } > > > > static struct drm_crtc_state * > > @@ -616,7 +614,6 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms, > > return err; > > > > drm_crtc_helper_add(crtc, &komeda_crtc_helper_funcs); > > - drm_crtc_vblank_reset(crtc); > > > > crtc->port = kcrtc->master->of_output_port; > > > > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c > > index c2507b7d8512..02904392e370 100644 > > --- a/drivers/gpu/drm/arm/malidp_drv.c > > +++ b/drivers/gpu/drm/arm/malidp_drv.c > > @@ -870,7 +870,6 @@ static int malidp_bind(struct device *dev) > > drm->irq_enabled = true; > > > > ret = drm_vblank_init(drm, drm->mode_config.num_crtc); > > - drm_crtc_vblank_reset(&malidp->crtc); > > if (ret < 0) { > > DRM_ERROR("failed to initialise vblank\n"); > > goto vblank_fail; > > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > > index 10985134ce0b..ce246b96330b 100644 > > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > > @@ -411,10 +411,8 @@ static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc) > > } > > > > state = kzalloc(sizeof(*state), GFP_KERNEL); > > - if (state) { > > - crtc->state = &state->base; > > - crtc->state->crtc = crtc; > > - } > > + if (state) > > + __drm_atomic_helper_crtc_reset(crtc, &state->base); > > } > > > > static struct drm_crtc_state * > > @@ -528,7 +526,6 @@ int atmel_hlcdc_crtc_create(struct drm_device *dev) > > } > > > > drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs); > > - drm_crtc_vblank_reset(&crtc->base); > > > > drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE); > > drm_crtc_enable_color_mgmt(&crtc->base, 0, false, > > diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c > > index 8fce6a115dfe..9ad74045158e 100644 > > --- a/drivers/gpu/drm/drm_atomic_state_helper.c > > +++ b/drivers/gpu/drm/drm_atomic_state_helper.c > > @@ -32,6 +32,7 @@ > > #include > > #include > > #include > > +#include > > #include > > > > #include > > @@ -93,6 +94,9 @@ __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc, > > if (crtc_state) > > __drm_atomic_helper_crtc_state_reset(crtc_state, crtc); > > > > + if (drm_dev_has_vblank(crtc->dev)) > > + drm_crtc_vblank_reset(crtc); > > + > > crtc->state = crtc_state; > > } > > EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset); > > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c > > index ca3368c828d0..9606185c284b 100644 > > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c > > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c > > @@ -1117,8 +1117,6 @@ static void mdp5_crtc_reset(struct drm_crtc *crtc) > > mdp5_crtc_destroy_state(crtc, crtc->state); > > > > __drm_atomic_helper_crtc_reset(crtc, &mdp5_cstate->base); > > - > > - drm_crtc_vblank_reset(crtc); > > } > > > > static const struct drm_crtc_funcs mdp5_crtc_funcs = { > > diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c > > index 83f31c6e891c..9b308b572eac 100644 > > --- a/drivers/gpu/drm/tegra/dc.c > > +++ b/drivers/gpu/drm/tegra/dc.c > > @@ -1168,7 +1168,6 @@ static void tegra_crtc_reset(struct drm_crtc *crtc) > > tegra_crtc_atomic_destroy_state(crtc, crtc->state); > > > > __drm_atomic_helper_crtc_reset(crtc, &state->base); > > - drm_crtc_vblank_reset(crtc); > > } > > > > static struct drm_crtc_state * > > diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c > > index 89a226912de8..4d01c4af61cd 100644 > > --- a/drivers/gpu/drm/tidss/tidss_crtc.c > > +++ b/drivers/gpu/drm/tidss/tidss_crtc.c > > @@ -352,8 +352,7 @@ static void tidss_crtc_reset(struct drm_crtc *crtc) > > return; > > } > > > > - crtc->state = &tcrtc->base; > > - crtc->state->crtc = crtc; > > + __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base); > > } > > > > static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc) > > diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c > > index 4b99e9fa84a5..e6ab59eed259 100644 > > --- a/drivers/gpu/drm/tidss/tidss_kms.c > > +++ b/drivers/gpu/drm/tidss/tidss_kms.c > > @@ -278,10 +278,6 @@ int tidss_modeset_init(struct tidss_device *tidss) > > if (ret) > > return ret; > > > > - /* Start with vertical blanking interrupt reporting disabled. */ > > - for (i = 0; i < tidss->num_crtcs; ++i) > > - drm_crtc_vblank_reset(tidss->crtcs[i]); > > - > > drm_mode_config_reset(ddev); > > > > dev_dbg(tidss->dev, "%s done\n", __func__); > > -- > Regards, > > Laurent Pinchart -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx