From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4347F2063F8 for ; Wed, 5 Mar 2025 23:09:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741216153; cv=none; b=Xgl1+Yk9KEqxdKKL/IoUmJ+N6hl9PXz/nwprgZALQS5qO0/vfYM/XCzuDeERjk8mc5DmpJB1nhdGR/bZUfbVgXNWiTJ/EQphZIRkmq0Lq92oTbVjsQxPEG+XeweJHOnHRCcNRDdCSivLfHIo8z39Q9MTDTy1cN5xJX5ev08aKWs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741216153; c=relaxed/simple; bh=1AlMbMSXreNWTCZYtXzrd8FRwnzaFMGvrbGfeij5zYI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J9F+Uyg/U59W4r07PMDo7dUI2XCIIN9mNJqlU66ik9d4Omv3oRshsrIGNS0JpBlyA1aYHhFYEhfDOY2gqrJ1pHosxefBZtQOb8Af1RIka+LbmyjQY14lXCRmexr7+s+udrEMW4fZW/jXAShhx4ISlWf5zg1Ja5qxMA3kXnoblKY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=XP0oLbHa; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XP0oLbHa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741216151; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/ky7nPuh5GrbUWyu2d6ZrknkHnXgJb5d1NGj1huVerQ=; b=XP0oLbHaMpAE1qLdGzHRgbS18+7/bt3hk2CPjjcCogNSbzsLQ2otjcTVf69tPluI8EL8pr DiyT1EygV8EUqXwIXwqsa326AEnBp1POs/oAIjIhPlMARSzocrJUN3hXuP7nArX1lICaGD k61plcmZ8P9GuIocoDjjYLjLG3tZvLE= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-460-dvQIoEmzNHGzBncmaxMr1w-1; Wed, 05 Mar 2025 18:08:54 -0500 X-MC-Unique: dvQIoEmzNHGzBncmaxMr1w-1 X-Mimecast-MFC-AGG-ID: dvQIoEmzNHGzBncmaxMr1w_1741216132 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 66278180025E; Wed, 5 Mar 2025 23:08:52 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.88.81]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 0B3BB300019E; Wed, 5 Mar 2025 23:08:48 +0000 (UTC) From: Lyude Paul To: dri-devel@lists.freedesktop.org, rust-for-linux@vger.kernel.org Cc: Danilo Krummrich , mcanal@igalia.com, Alice Ryhl , Maxime Ripard , Simona Vetter , Daniel Almeida , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , linux-kernel@vger.kernel.org (open list) Subject: [RFC v3 30/33] rust: drm/kms: Add Device::num_crtcs() Date: Wed, 5 Mar 2025 17:59:46 -0500 Message-ID: <20250305230406.567126-31-lyude@redhat.com> In-Reply-To: <20250305230406.567126-1-lyude@redhat.com> References: <20250305230406.567126-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 A binding for checking drm_device.num_crtcs. We'll need this in a moment for vblank support, since setting it up requires knowing the number of CRTCs that a driver has initialized. Signed-off-by: Lyude Paul --- rust/kernel/drm/kms.rs | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/rust/kernel/drm/kms.rs b/rust/kernel/drm/kms.rs index 429ce28229c9e..36a0b4c4454ba 100644 --- a/rust/kernel/drm/kms.rs +++ b/rust/kernel/drm/kms.rs @@ -311,6 +311,17 @@ pub fn mode_config_lock(&self) -> ModeConfigGuard<'_, T> { // held throughout ModeConfigGuard's lifetime. ModeConfigGuard(self.mode_config_mutex().lock(), PhantomData) } + + /// Return the number of registered CRTCs + #[inline] + pub fn num_crtcs(&self) -> u32 { + // SAFETY: + // * This can only be modified during the single-threaded context before registration, so + // this is safe + // * num_crtc could be >= 0, but no less - so casting to u32 is fine (and better to prevent + // errors) + unsafe { (*self.as_raw()).mode_config.num_crtc as u32 } + } } /// A modesetting object in DRM. -- 2.48.1