From patchwork Fri Dec 11 09:26:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 58266 Delivered-To: patch@linaro.org Received: by 10.112.157.166 with SMTP id wn6csp7748lbb; Fri, 11 Dec 2015 01:26:45 -0800 (PST) X-Received: by 10.98.43.67 with SMTP id r64mr13811847pfr.3.1449826005699; Fri, 11 Dec 2015 01:26:45 -0800 (PST) Return-Path: Received: from gabe.freedesktop.org (gabe.freedesktop.org. [131.252.210.177]) by mx.google.com with ESMTP id pz7si564879pab.216.2015.12.11.01.26.45; Fri, 11 Dec 2015 01:26:45 -0800 (PST) Received-SPF: pass (google.com: domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) client-ip=131.252.210.177; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2235C6EB4C; Fri, 11 Dec 2015 01:26:44 -0800 (PST) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mailout4.w1.samsung.com (mailout4.w1.samsung.com [210.118.77.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C25A6EB4C for ; Fri, 11 Dec 2015 01:26:42 -0800 (PST) MIME-version: 1.0 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout4.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NZ600IM8SWD33A0@mailout4.w1.samsung.com> for dri-devel@lists.freedesktop.org; Fri, 11 Dec 2015 09:26:37 +0000 (GMT) X-AuditID: cbfec7f5-f79b16d000005389-06-566a96cdab29 Received: from eusync2.samsung.com ( [203.254.199.212]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id 3B.89.21385.DC69A665; Fri, 11 Dec 2015 09:26:37 +0000 (GMT) Received: from [106.116.147.30] by eusync2.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0NZ600HCBSWCA150@eusync2.samsung.com>; Fri, 11 Dec 2015 09:26:37 +0000 (GMT) Subject: Re: [PATCH v2 06/22] drm/exynos: move dma_addr attribute from exynos plane to exynos fb To: Inki Dae , dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org References: <1448891617-18830-1-git-send-email-m.szyprowski@samsung.com> <1448891617-18830-7-git-send-email-m.szyprowski@samsung.com> <566978A1.60302@samsung.com> <566A9115.6040109@samsung.com> From: Marek Szyprowski Message-id: <566A96CB.4020309@samsung.com> Date: Fri, 11 Dec 2015 10:26:35 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 In-reply-to: <566A9115.6040109@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrALMWRmVeSWpSXmKPExsVy+t/xK7pnp2WFGUzbx2Jxa905VouNM9az Wlz5+p7NYueDXewWk+5PYLF483YNk8WLexdZLF6/MLSYcX4fk8WMyS/ZLNpWf2B14Pa4332c yePfMXaPLf132T12TtrL5NG3ZRWjx+dNcgFsUVw2Kak5mWWpRfp2CVwZf++VF7wIq3j8aBZ7 A+MKty5GDg4JAROJt50eXYycQKaYxIV769m6GLk4hASWMkpsO7KcFSTBKyAo8WPyPRaQemYB eYkjl7JBwswCZhJfXh5mhah/zijRcfMPM0hCWCBJov3fQjYQW0QgU+Jl83pmiKKjjBJN8z+x gDjMAp+ZJObfms0CUsUmYCjR9baLDWQDr4CWxJudaiBhFgFVid1v7oIdISoQI/F48VYwm1NA W2Ljxu0sExgFZiG5bxbCfbOQ3LeAkXkVo2hqaXJBcVJ6rpFecWJucWleul5yfu4mRkg8fN3B uPSY1SFGAQ5GJR7eBRxZYUKsiWXFlbmHGCU4mJVEeC9OAQrxpiRWVqUW5ccXleakFh9ilOZg URLnnbnrfYiQQHpiSWp2ampBahFMlomDU6qBMSFc6MUt72e2gtvPiAs2//ANDltVuSle8ukR 7nv7jSpPvp664UaYx7YnZTuLw3pY0+q1bHbL72Hnu/3z9Dqp1Oow88wS9dDqhIUH+XqcjXZ7 HJntdaejr9RB+4dihN4e7Tvz/W7o1LPubGe9s67fxnP20eNzXcovuoqWO898Epm8QipMYk2P EktxRqKhFnNRcSIAnxSaPIMCAAA= Cc: Javier Martinez Canillas , Krzysztof Kozlowski , Tobias Jakobi , Bartlomiej Zolnierkiewicz , Seung-Woo Kim , Andrzej Hajda X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 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" Hi Inki, On 2015-12-11 10:02, Inki Dae wrote: > Hi Marek, > > I found out why NULL point access happened. That was incurred by below your patch, > [PATCH] drm/exynos: move dma_addr attribute from exynos plane to exynos fb > > When another crtc driver is hotplugged in runtime such as HDMI or VIDI, > the drm frambuffer object of fb_helper is set to the plane state of the new crtc driver > so the driver should get the drm framebuffer object from the plane's state or > exynos_plane->pending_fb which is set by exynos_plane_atomic_update function. > > After that, I think the drm framebuffer should be set to drm plane as a current fb > which would be scanned out. > > Anyway, I can fix it like below if you are ok. > > Thanks, > Inki Dae > > --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c > @@ -137,7 +137,7 @@ static void vidi_update_plane(struct exynos_drm_crtc *crtc, > if (ctx->suspended) > return; > > - addr = exynos_drm_fb_dma_addr(plane->base.fb, 0); > + addr = exynos_drm_fb_dma_addr(plane->pending_fb, 0); > DRM_DEBUG_KMS("dma_addr = %pad\n", &addr); > > + plane->base.fb = plane->pending_fb; plane->base.fb should not be modified. I think that the following fix is more appropriate: if (ctx->vblank_on) I will investigate the case of NULL plane->state.fb, because it might be relevant to other crtc drivers as well. > > if (ctx->vblank_on) > > > 2015년 12월 10일 22:05에 Inki Dae 이(가) 쓴 글: >> >> 2015년 11월 30일 22:53에 Marek Szyprowski 이(가) 쓴 글: >>> DMA address is a framebuffer attribute and the right place for it is >>> exynos_drm_framebuffer not exynos_drm_plane. This patch also introduces >>> helper function for getting dma address of the given framebuffer. >>> >>> Signed-off-by: Marek Szyprowski >>> Reviewed-by: Gustavo Padovan >>> --- >>> drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 13 ++++++++----- >>> drivers/gpu/drm/exynos/exynos7_drm_decon.c | 16 +++++++++------- >>> drivers/gpu/drm/exynos/exynos_drm_drv.h | 3 --- >>> drivers/gpu/drm/exynos/exynos_drm_fb.c | 16 ++++++---------- >>> drivers/gpu/drm/exynos/exynos_drm_fb.h | 3 +-- >>> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 10 ++++++---- >>> drivers/gpu/drm/exynos/exynos_drm_plane.c | 18 ------------------ >>> drivers/gpu/drm/exynos/exynos_drm_vidi.c | 5 ++++- >>> drivers/gpu/drm/exynos/exynos_mixer.c | 7 ++++--- >>> 9 files changed, 38 insertions(+), 53 deletions(-) >>> >> <--snip--> >> >>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c >>> index 669362c53f49..3ce141236fad 100644 >>> --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c >>> +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c >>> @@ -24,6 +24,7 @@ >>> >>> #include "exynos_drm_drv.h" >>> #include "exynos_drm_crtc.h" >>> +#include "exynos_drm_fb.h" >>> #include "exynos_drm_plane.h" >>> #include "exynos_drm_vidi.h" >>> >>> @@ -126,11 +127,13 @@ static void vidi_update_plane(struct exynos_drm_crtc *crtc, >>> struct exynos_drm_plane *plane) >>> { >>> struct vidi_context *ctx = crtc->ctx; >>> + dma_addr_t addr; >>> >>> if (ctx->suspended) >>> return; >>> >>> - DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr); >>> + addr = exynos_drm_fb_dma_addr(plane->base.fb, 0); >> At this point, plane->base.fb is NULL so null pointer access happens like below, >> >> [ 5.969422] Unable to handle kernel NULL pointer dereference at virtual address 00000090 >> [ 5.977481] pgd = ee590000 >> [ 5.980142] [00000090] *pgd=6e526831, *pte=00000000, *ppte=00000000 >> [ 5.986347] Internal error: Oops: 17 [#1] PREEMPT SMP ARM >> [ 5.991712] Modules linked in: >> [ 5.994770] CPU: 3 PID: 1598 Comm: sh Not tainted 4.4.0-rc3-00052-gc60d7e2-dirty #199 >> [ 6.002565] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) >> [ 6.008647] task: ef328000 ti: ee4d4000 task.ti: ee4d4000 >> [ 6.014053] PC is at exynos_drm_fb_dma_addr+0x8/0x14 >> [ 6.018990] LR is at vidi_update_plane+0x4c/0xc4 >> [ 6.023581] pc : [] lr : [] psr: 80000013 >> [ 6.023581] sp : ee4d5d90 ip : 00000001 fp : 00000000 >> [ 6.035029] r10: 00000000 r9 : c05b965c r8 : ee813e00 >> [ 6.040241] r7 : 00000000 r6 : ee8e3330 r5 : 00000000 r4 : ee8e3010 >> [ 6.046749] r3 : 00000000 r2 : 00000000 r1 : 00000024 r0 : 00000000 >> [ 6.053264] Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none >> [ 6.060379] Control: 10c5387d Table: 6e59004a DAC: 00000051 >> [ 6.066107] Process sh (pid: 1598, stack limit = 0xee4d4210) >> [ 6.071748] Stack: (0xee4d5d90 to 0xee4d6000) >> [ 6.076100] 5d80: 00000000 ee813300 ee476e40 00000005 >> [ 6.084236] 5da0: ee8e3330 c028ac14 00000008 ee476e40 ee476fc0 ef3b3800 ee476fc0 eeb3e380 >> [ 6.092395] 5dc0: 00000002 c02b08e4 00000000 eeb3e3a4 ee476fc0 ee476e40 ef3b3800 eeb3e380 >> [ 6.100554] 5de0: 00000002 c02b12b8 ee854400 00000000 00000001 ee8501a8 00000000 ee476e40 >> [ 6.108714] 5e00: ef3b3800 00000001 ee476e40 00000050 ee850c80 00000001 ee476e40 ef3b3aac >> [ 6.116873] 5e20: 00000002 000000ff 00000000 c028e0ec 000a82b4 c02acc50 ee8e36a0 ee476c80 >> [ 6.125032] 5e40: ef3b3aac ef3b3800 ee476c9c ee850c80 ef3b3800 ef3b3800 ef3b3800 ef3b398c >> [ 6.133191] 5e60: c088c390 00000002 000a82b4 c028f8d4 00000000 ef3b3800 ef0f4300 c028f948 >> [ 6.141350] 5e80: ee850c80 c028f864 ef3b3a84 00000001 ef3b3a90 c02853e4 00000001 00000000 >> [ 6.149509] 5ea0: 000a82b4 ee4d5ec0 00000002 ee8e3010 00000002 00000002 ee4d5f88 00000000 >> [ 6.157669] 5ec0: 00000000 eeb8df00 000a82b4 c02c4278 00000002 ee476b00 eeb8df0c c01390ac >> [ 6.165828] 5ee0: 00000000 00000000 ee4e1f00 00000002 000a9540 ee4d5f88 c000f844 ee4d4000 >> [ 6.173987] 5f00: 00000000 c00dbf70 000a82b4 c00093dc ee4d4000 ee4d5f78 ef328234 c0579bec >> [ 6.182146] 5f20: 00000001 00000001 ee4d5f3c 00000001 ee45e9c4 00000001 000a82b4 c005ca74 >> [ 6.190306] 5f40: ee45e9c4 00000002 000a9540 c005cad4 ee4e1f00 00000002 000a9540 ee4d5f88 >> [ 6.198465] 5f60: c000f844 c00dc770 00000000 00000000 ee4e1f00 ee4e1f00 00000002 000a9540 >> [ 6.206624] 5f80: c000f844 c00dcf98 00000000 00000000 00000003 000a7c40 00000001 000a9540 >> [ 6.214783] 5fa0: 00000004 c000f680 000a7c40 00000001 00000001 000a9540 00000002 00000000 >> [ 6.222942] 5fc0: 000a7c40 00000001 000a9540 00000004 00000020 000a82c8 000a8294 000a82b4 >> [ 6.231102] 5fe0: 00000000 be8b1624 00012345 b6e94166 40000030 00000001 00000000 00000000 >> [ 6.239270] [] (exynos_drm_fb_dma_addr) from [] (vidi_update_plane+0x4c/0xc4) >> [ 6.248122] [] (vidi_update_plane) from [] (drm_atomic_helper_commit_planes+0x1f4/0x258) >> [ 6.257928] [] (drm_atomic_helper_commit_planes) from [] (exynos_atomic_commit_complete+0xe4/0x1c4) >> [ 6.268688] [] (exynos_atomic_commit_complete) from [] (exynos_atomic_commit+0x180/0x1cc) >> [ 6.278584] [] (exynos_atomic_commit) from [] (restore_fbdev_mode+0x260/0x290) >> [ 6.287525] [] (restore_fbdev_mode) from [] (drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x74) >> [ 6.298111] [] (drm_fb_helper_restore_fbdev_mode_unlocked) from [] (drm_fb_helper_set_par+0x30/0x54) >> [ 6.308961] [] (drm_fb_helper_set_par) from [] (drm_fb_helper_hotplug_event+0x9c/0xdc) >> [ 6.318595] [] (drm_fb_helper_hotplug_event) from [] (drm_helper_hpd_irq_event+0xd4/0x160) >> [ 6.328578] [] (drm_helper_hpd_irq_event) from [] (vidi_store_connection+0x94/0xcc) >> [ 6.337954] [] (vidi_store_connection) from [] (kernfs_fop_write+0xb8/0x1bc) >> [ 6.346723] [] (kernfs_fop_write) from [] (__vfs_write+0x20/0xd8) >> [ 6.354531] [] (__vfs_write) from [] (vfs_write+0x90/0x164) >> [ 6.361821] [] (vfs_write) from [] (SyS_write+0x44/0x9c) >> [ 6.368855] [] (SyS_write) from [] (ret_fast_syscall+0x0/0x3c) >> [ 6.376404] Code: eb0b17f1 eaffffe7 e3510003 d2811024 (d7900101) >> >> When vidi driver is intiated by triggering a connection sysfs file, vidi driver tries modeset binding by calling drm_fb_helper_hotplug_event. >> However, at this time it seems there is a case that plan->state->crtc exists but plane->fb is NULL, which would be related to vidi driver. >> >> I just looked into this issue roughly so we would need to check this issue in more details. >> >> Thanks, >> Inki Dae >> >>> + DRM_DEBUG_KMS("dma_addr = %pad\n", &addr); >>> >>> if (ctx->vblank_on) >>> schedule_work(&ctx->work); >>> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c >>> index 47777be1a754..f40de82848dc 100644 >>> --- a/drivers/gpu/drm/exynos/exynos_mixer.c >>> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c >>> @@ -37,6 +37,7 @@ >>> >>> #include "exynos_drm_drv.h" >>> #include "exynos_drm_crtc.h" >>> +#include "exynos_drm_fb.h" >>> #include "exynos_drm_plane.h" >>> #include "exynos_drm_iommu.h" >>> >>> @@ -422,8 +423,8 @@ static void vp_video_buffer(struct mixer_context *ctx, >>> return; >>> } >>> >>> - luma_addr[0] = plane->dma_addr[0]; >>> - chroma_addr[0] = plane->dma_addr[1]; >>> + luma_addr[0] = exynos_drm_fb_dma_addr(fb, 0); >>> + chroma_addr[0] = exynos_drm_fb_dma_addr(fb, 1); >>> >>> if (mode->flags & DRM_MODE_FLAG_INTERLACE) { >>> ctx->interlace = true; >>> @@ -575,7 +576,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx, >>> dst_y_offset = plane->crtc_y; >>> >>> /* converting dma address base and source offset */ >>> - dma_addr = plane->dma_addr[0] >>> + dma_addr = exynos_drm_fb_dma_addr(fb, 0) >>> + (plane->src_x * fb->bits_per_pixel >> 3) >>> + (plane->src_y * fb->pitches[0]); >>> src_x_offset = 0; >>> Best regards --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c @@ -132,12 +132,13 @@ static void vidi_update_plane(struct exynos_drm_crtc *crtc, struct exynos_drm_plane *plane) { struct vidi_context *ctx = crtc->ctx; - dma_addr_t addr; + dma_addr_t addr = 0; if (ctx->suspended) return; - addr = exynos_drm_fb_dma_addr(plane->base.fb, 0); + if (plane->base.fb) + addr = exynos_drm_fb_dma_addr(plane->base.fb, 0); DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);