From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2D733197510; Wed, 5 Jun 2024 11:54:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717588467; cv=none; b=Ju/p3DeskVSXdjA8v2f0azxwV0ecQZPCdvXv4tEUO0vR5D6To9tGfOSK8KgOmEdWRdk5YgT5iJVnVQJ0uff2Njzd0oAqfMNIHK/XLOw7y/9oR20iW8Wx41L/hH3U8STbIzLKdJVBuxEDGBIx+k21fNF+3h7+1Q54R7MEL5I/gGw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717588467; c=relaxed/simple; bh=ghaJ6hQdbi2GgdV2gtK7tru7aQc6vMTFxyqHR4nedXA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ttte8NSHVV6YkbfNkX1oUgcs6KzfrKgfSQqB82cWuoUVHv0g8fh0oi3Ox/J2hVF7chQItnviybRANg3x7QVyYoKPlsjC1whyXnqY/GcHy3lNOM5NK0NHya/iBNvlU8V8bGcu0DxJLPVYTcLpwmmDucbQyyptu+ARiVBDw/mbMu4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AmjavBrU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AmjavBrU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BECEC3277B; Wed, 5 Jun 2024 11:54:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717588467; bh=ghaJ6hQdbi2GgdV2gtK7tru7aQc6vMTFxyqHR4nedXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AmjavBrU2R9OGVGvchzqoappaJVrl3tpWL+r7kLazQX6M0Sp1+WPRdzuhwqtZdfnB QLrv6TL2ekamMjA5H8+dwO8+F2aMHkeVURPxTpbhkiOtWGBMAaf/4eWFoY7X3FwadL tGh6+40INNrKTlP3qkctbaNZ2Xfvrz7YnRJCfzSP5IeVZdtEvmlW44lS4p2lDEhGmN l40y5cx05J4eNAiNyP6JANGUvzOMI4hWoUZHjHCjDYYgw9Jh6bB3hwuqyRG3IExhAT INBg5kx8mJBBG7Mqf2mCtI+js+UzPUy5Ghl4SIoyQ+U7ASagQU+BWQtCqDhDppl5qh QMUYa8MDMvMrw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Songyang Li , Thomas Bogendoerfer , Sasha Levin , rdunlap@infradead.org, bhelgaas@google.com, linux-mips@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 6/9] MIPS: Octeon: Add PCIe link status check Date: Wed, 5 Jun 2024 07:54:04 -0400 Message-ID: <20240605115415.2964165-6-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605115415.2964165-1-sashal@kernel.org> References: <20240605115415.2964165-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.160 Content-Transfer-Encoding: 8bit From: Songyang Li [ Upstream commit 29b83a64df3b42c88c0338696feb6fdcd7f1f3b7 ] The standard PCIe configuration read-write interface is used to access the configuration space of the peripheral PCIe devices of the mips processor after the PCIe link surprise down, it can generate kernel panic caused by "Data bus error". So it is necessary to add PCIe link status check for system protection. When the PCIe link is down or in training, assigning a value of 0 to the configuration address can prevent read-write behavior to the configuration space of peripheral PCIe devices, thereby preventing kernel panic. Signed-off-by: Songyang Li Signed-off-by: Thomas Bogendoerfer Signed-off-by: Sasha Levin --- arch/mips/pci/pcie-octeon.c | 6 ++++++ 1 file changed, 6 insertions(+) mode change 100644 => 100755 arch/mips/pci/pcie-octeon.c diff --git a/arch/mips/pci/pcie-octeon.c b/arch/mips/pci/pcie-octeon.c old mode 100644 new mode 100755 index d919a0d813a17..38de2a9c3cf1a --- a/arch/mips/pci/pcie-octeon.c +++ b/arch/mips/pci/pcie-octeon.c @@ -230,12 +230,18 @@ static inline uint64_t __cvmx_pcie_build_config_addr(int pcie_port, int bus, { union cvmx_pcie_address pcie_addr; union cvmx_pciercx_cfg006 pciercx_cfg006; + union cvmx_pciercx_cfg032 pciercx_cfg032; pciercx_cfg006.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG006(pcie_port)); if ((bus <= pciercx_cfg006.s.pbnum) && (dev != 0)) return 0; + pciercx_cfg032.u32 = + cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + if ((pciercx_cfg032.s.dlla == 0) || (pciercx_cfg032.s.lt == 1)) + return 0; + pcie_addr.u64 = 0; pcie_addr.config.upper = 2; pcie_addr.config.io = 1; -- 2.43.0