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 909961ACACA; Wed, 5 Jun 2024 11:52:45 +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=1717588365; cv=none; b=tQs/zH99VXAvC3bKnrXsjkAtkZ70R5JNVfOXRu5nfmfnCX6LWID0HeHUHhsmDqXwop8a/a1wPUCgdmH04OkkfzhgP44GYmL2V+NbVfzj2FFyccS9D3V7GEJCq/oODg2VDsWbN3Xdq4B3wvMBEB56tHSkBBMKHKP//fOFYkUpojU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717588365; c=relaxed/simple; bh=2Eq7FXzfZwx2HaQ3uWYtAcoK8wDlGTa/EEgdlOM4Who=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rjhdc/43TCLdxOibMEwHNsBWDin42mDRSli7hldsN3pmY1EutIoGDYqO/6e0hi1PMsH/TsY+zXHr8zLbXnuj8fWzplYbtoPeDpvT8iBR4meTZ+2f0nnnpl+ufS4Wnr0zit1OUzoaPpd3Wj4gT014pLm6yhyJSrVM1Qfsx7rm4MU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PLXEY2ZU; 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="PLXEY2ZU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C69CC3277B; Wed, 5 Jun 2024 11:52:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717588365; bh=2Eq7FXzfZwx2HaQ3uWYtAcoK8wDlGTa/EEgdlOM4Who=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PLXEY2ZU4Chgee1Rt2cKuNILr/0FBJd59qVG5qTEnudewdcKKaaLInz/7/qzo1zBw /05YuvUnoJB29UuhFIXVK3JYka363X6mJvyII08+J9FeRfbmk3LxU3z37o9Wrg59Iz vzL/TGLOPb4RrYllNbyPDOCJUPkRLfcBWADTsUgNmf/jhEAr6pvjcoAZg8Pr423Hk+ DMvHgKNlJVgb4BP06jYerY/WcR+oFDA9LRueehis263rHMXcZpQ5f8NtXJ1AIK74zR LkVyZPo6JpHytEX5XGguzOZZ1tueZVcbxT6Eb1PhceoTN+3aTloycfcIHWAKl82Ddw EpcsnnicgZlOQ== 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 6.6 10/20] MIPS: Octeon: Add PCIe link status check Date: Wed, 5 Jun 2024 07:51:53 -0400 Message-ID: <20240605115225.2963242-10-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605115225.2963242-1-sashal@kernel.org> References: <20240605115225.2963242-1-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 6.6.32 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 c9edd3fb380df..9eaacd3d33880 --- 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