From nobody Thu Oct 2 02:04:50 2025 Received: from mout-p-103.mailbox.org (mout-p-103.mailbox.org [80.241.56.161]) (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 AAD6B223DF1; Tue, 23 Sep 2025 23:47:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.161 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758671229; cv=none; b=e23S4TS6iCwaKWlNGVNhvwSywHEKCjqeWySw8bx7teH0jd6vj2CGr9W/+Xih/MT8FPCdLNxR3Xe62O7KdxoJFuWv4vdn+fCK+5jKotPPPdiGIntWchJD+K6MWRJ4LhN/3q6Ang4KvYt5mPor21GQmN5nxRxmRp0eRiL34T2x89E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758671229; c=relaxed/simple; bh=8YgpqE03TuFSZdkW7VrnoXlZj2IFVZpYR2gJHtHFLPo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=sSsS1aWkUQyI6QTrKoovB8kLmT9q+U6S/LX7D6DFaBjcviMhn/vagAOz6JoxX2SgHTqSPQRqJXIrF1seBMGPpmwAzteZVXxU3OKDhhOa6EY1JmnNOTxrZdPQIyKHo7y+KHpMAQeN1mPZNtRJ2d59qw50a7PRldmNVnaOMuW2JlE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org; spf=pass smtp.mailfrom=mailbox.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=t6zq26Tf; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=uRo8Vx5j; arc=none smtp.client-ip=80.241.56.161 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mailbox.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="t6zq26Tf"; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="uRo8Vx5j" Received: from smtp1.mailbox.org (smtp1.mailbox.org [IPv6:2001:67c:2050:b231:465::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-103.mailbox.org (Postfix) with ESMTPS id 4cWc8N3L1Tz9t0f; Wed, 24 Sep 2025 01:47:00 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1758671220; 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; bh=itgmMwd0vgP5PZhXQStLZwyQ5NKDgt2vMyRJtHWxfhY=; b=t6zq26TfpmPurufgNe3Zr1qEwXCVwvEXQwTXv89gast/lvK/9D4xxihA3Fp0AwU2Zlkjhf 1tq+cD7uvxhZp8nTtk1wecIiyTJagtmz4FT3ls6fhq1cdLTd+hnq9xY2tULzEV3UmPt1Ot S+pUXu3Li0KuavilQIi1oBtrb7X71vQaKN5ZPD82wXUoph+rlcMT/+rh0GpjywHmDIkRZR eD4jD6BbVnPbTymh/uHYfOY+QOj6o+lj7R722vBfanmRKjNkWORKN1M3lNAgbj3TtJr7bv s/SGpinoDhPOesEjQZvVUQh8DEj0dnJysgKVrvjTuxnB0g4RmIs+dD99E2zFtQ== Authentication-Results: outgoing_mbo_mout; dkim=pass header.d=mailbox.org header.s=mail20150812 header.b=uRo8Vx5j; spf=pass (outgoing_mbo_mout: domain of marek.vasut+renesas@mailbox.org designates 2001:67c:2050:b231:465::1 as permitted sender) smtp.mailfrom=marek.vasut+renesas@mailbox.org From: Marek Vasut DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1758671218; 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; bh=itgmMwd0vgP5PZhXQStLZwyQ5NKDgt2vMyRJtHWxfhY=; b=uRo8Vx5jveMoobMXiFFJ7yE5V1j4GJBisPxrTO3Y1HPd0fRzWCw/+4IxgTQhiwKetqJ/e6 IE7TB5pVU0nDcysPMGsJEV7Vr1jx7hDH8GRczOJnUhWcGNKMmIdGUwzway/crNztzfwkV1 IoelGxcNFv7CDcNkpiZpJzSIpVdsG0prbl0Xhsi7mnUnXQEwVLtPRPdqN9qEz9PK97B61S bHWkir6FejYAAcLURVj9xNTRwcugtaXEuHul/qmZcMsBaxSEBkApQMQizE0ZBFfbdotjKc tyHvYoAu2N74yZ7ZRqbaaY0zC4pcxTbT36Wkv4EFM4sxS5Y5ce3ukhGhfhB3qQ== To: linux-pci@vger.kernel.org Cc: Marek Vasut , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , Geert Uytterhoeven , Lorenzo Pieralisi , Magnus Damm , Manivannan Sadhasivam , Marek Vasut , Rob Herring , Yoshihiro Shimoda , linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2] PCI: rcar-host: Add static assertion to check !PCI_LOCKLESS_CONFIG Date: Wed, 24 Sep 2025 01:46:18 +0200 Message-ID: <20250923234644.82890-1-marek.vasut+renesas@mailbox.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-MBO-RS-ID: e57ee752eec6cf1c657 X-MBO-RS-META: cwmw45enrhaw5sa8tr4qxzks97g1geux X-Rspamd-Queue-Id: 4cWc8N3L1Tz9t0f This driver can not function correctly without PCIe subsystem level config space access serialization. In case PCI_LOCKLESS_CONFIG is ever enabled on ARM, complain loudly so the driver can be updated accordingly. Signed-off-by: Marek Vasut --- Cc: "Krzysztof Wilczy=C5=84ski" Cc: Bjorn Helgaas Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Magnus Damm Cc: Manivannan Sadhasivam Cc: Marek Vasut Cc: Rob Herring Cc: Yoshihiro Shimoda Cc: linux-kernel@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org --- V2: Add depends on !PCI_LOCKLESS_CONFIG into Kconfig file, to prevent this from being built when PCI_LOCKLESS_CONFIG is not set at all --- drivers/pci/controller/Kconfig | 1 + drivers/pci/controller/pcie-rcar-host.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 41748d083b933..3f489bed289fb 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -244,6 +244,7 @@ config PCIE_RCAR_HOST bool "Renesas R-Car PCIe controller (host mode)" depends on ARCH_RENESAS || COMPILE_TEST depends on PCI_MSI + depends on !PCI_LOCKLESS_CONFIG select IRQ_MSI_LIB help Say Y here if you want PCIe controller support on R-Car SoCs in host diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controll= er/pcie-rcar-host.c index 213028052aa58..29e13f7ff7ff1 100644 --- a/drivers/pci/controller/pcie-rcar-host.c +++ b/drivers/pci/controller/pcie-rcar-host.c @@ -35,6 +35,14 @@ =20 #include "pcie-rcar.h" =20 +/* + * This driver can not function correctly without PCIe subsystem level + * config space access serialization. In case PCI_LOCKLESS_CONFIG is + * ever enabled on ARM, complain loudly so the driver can be updated + * accordingly. + */ +static_assert(!IS_ENABLED(CONFIG_PCI_LOCKLESS_CONFIG)); + struct rcar_msi { DECLARE_BITMAP(used, INT_PCI_MSI_NR); struct irq_domain *domain; --=20 2.51.0