From patchwork Thu Oct 3 14:36:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 13821105 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 E308DCF34A9 for ; Thu, 3 Oct 2024 14:37:02 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4638110E866; Thu, 3 Oct 2024 14:37:02 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="FzzZB/jE"; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0F7FC10E866 for ; Thu, 3 Oct 2024 14:37:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727966220; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VeyIJxw7aNdnhQcgAthWMhSN6IB9NSiqC9XEuzUPS94=; b=FzzZB/jEQMFzIQotw7vpSOB2bEaVdJgcl2zbt1sXoxHgVfBTQKH0ZNFdlnaK2kKa2Sd2rW NRIw4b2juJArNB8VeSwlsisn91uCI370BGqP+PMEoJ8EsPhqnFMPuoY3YEBlISOgynyrAE SSY8sn770fF0Yx6n9Co1ZMkww1r0qbE= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-694-IXatcD54P2GLS6cLQmoyGw-1; Thu, 03 Oct 2024 10:36:57 -0400 X-MC-Unique: IXatcD54P2GLS6cLQmoyGw-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0E64719772F9; Thu, 3 Oct 2024 14:36:56 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.112]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2AC161955F41; Thu, 3 Oct 2024 14:36:52 +0000 (UTC) From: Hans de Goede To: Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , Xinhui Pan Cc: Hans de Goede , Simona Vetter , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 6.12 regression fix 2/2] drm/radeon: Revert: "use GEM references instead of TTMs" Date: Thu, 3 Oct 2024 16:36:40 +0200 Message-ID: <20241003143640.14932-3-hdegoede@redhat.com> In-Reply-To: <20241003143640.14932-1-hdegoede@redhat.com> References: <20241003143640.14932-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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" Commit fd69ef05029f ("drm/radeon: use GEM references instead of TTMs") causes a black screen at boot instead of showing the GDM login screen (the system is still alive). dmesg shows the following oops (abbreviated) when this happens: [ 29.315203] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 29.315209] #PF: supervisor read access in kernel mode [ 29.315213] #PF: error_code(0x0000) - not-present page [ 29.315215] PGD 0 P4D 0 [ 29.315220] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI [ 29.315225] CPU: 0 UID: 42 PID: 2253 Comm: Xwayland Tainted: G 6.12.0-rc1+ #159 [ 29.315232] Hardware name: Micro-Star International Co., Ltd. MS-7C95/B550M PRO-VDH WIFI (MS-7C95), BIOS 2.L0 07/18/2024 [ 29.315234] RIP: 0010:drm_gem_object_free+0xc/0x20 [ 29.315272] Call Trace: [ 29.315274] [ 29.315305] ? asm_exc_page_fault+0x22/0x30 [ 29.315315] ? drm_gem_object_free+0xc/0x20 [ 29.315320] radeon_bo_unref+0x50/0x60 [radeon] [ 29.315337] radeon_vm_fini+0x1ca/0x350 [radeon] [ 29.315356] radeon_driver_postclose_kms+0x16d/0x180 [radeon] [ 29.315370] drm_file_free+0x229/0x280 [ 29.315377] drm_release+0x5f/0xe0 [ 29.315381] __fput+0xfc/0x2c0 Revert the change to restore things back to working order. Fixes: fd69ef05029f ("drm/radeon: use GEM references instead of TTMs") Signed-off-by: Hans de Goede --- drivers/gpu/drm/radeon/radeon_gem.c | 2 +- drivers/gpu/drm/radeon/radeon_object.c | 7 +++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c index 9735f4968b86..210e8d43bb23 100644 --- a/drivers/gpu/drm/radeon/radeon_gem.c +++ b/drivers/gpu/drm/radeon/radeon_gem.c @@ -88,7 +88,7 @@ static void radeon_gem_object_free(struct drm_gem_object *gobj) if (robj) { radeon_mn_unregister(robj); - ttm_bo_put(&robj->tbo); + radeon_bo_unref(&robj); } } diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c index d0e4b43d155c..450ff7daa46c 100644 --- a/drivers/gpu/drm/radeon/radeon_object.c +++ b/drivers/gpu/drm/radeon/radeon_object.c @@ -256,15 +256,18 @@ struct radeon_bo *radeon_bo_ref(struct radeon_bo *bo) if (bo == NULL) return NULL; - drm_gem_object_get(&bo->tbo.base); + ttm_bo_get(&bo->tbo); return bo; } void radeon_bo_unref(struct radeon_bo **bo) { + struct ttm_buffer_object *tbo; + if ((*bo) == NULL) return; - drm_gem_object_put(&(*bo)->tbo.base); + tbo = &((*bo)->tbo); + ttm_bo_put(tbo); *bo = NULL; }