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Wed, 30 Sep 2020 08:29:15 -0500 Received: from DLEE112.ent.ti.com (157.170.170.23) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Wed, 30 Sep 2020 08:29:15 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Wed, 30 Sep 2020 08:29:15 -0500 Received: from [10.250.232.108] (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 08UDTBPi053956; Wed, 30 Sep 2020 08:29:12 -0500 Subject: Re: [PATCH] PCI: layerscape: Change back to the default error response behavior To: Zhiqiang Hou , , , , , , , References: <20200929131328.13779-1-Zhiqiang.Hou@nxp.com> From: Kishon Vijay Abraham I Message-ID: <6e6d021b-bc46-63b4-7e84-6ca2c8e631f9@ti.com> Date: Wed, 30 Sep 2020 18:59:11 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200929131328.13779-1-Zhiqiang.Hou@nxp.com> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200930_092924_455963_2AD626E0 X-CRM114-Status: GOOD ( 22.61 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: roy.zang@nxp.com, mingkai.hu@nxp.com, leoyang.li@nxp.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Hou, On 29/09/20 6:43 pm, Zhiqiang Hou wrote: > From: Hou Zhiqiang > > In the current error response behavior, it will send a SLVERR response > to device's internal AXI slave system interface when the PCIe controller > experiences an erroneous completion (UR, CA and CT) from an external > completer for its outbound non-posted request, which will result in > SError and crash the kernel directly. > This patch change back it to the default behavior to increase the > robustness of the kernel. In the default behavior, it always sends an > OKAY response to the internal AXI slave interface when the controller > gets these erroneous completions. And the AER driver will report and > try to recover these errors. I don't think not forwarding any error interrupts is a good idea. Maybe you could disable it while reading configuration space registers (vendorID and deviceID) and then enable error forwarding back? Thanks Kishon > > Signed-off-by: Hou Zhiqiang > --- > drivers/pci/controller/dwc/pci-layerscape.c | 11 ----------- > 1 file changed, 11 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c > index f24f79a70d9a..e92ab8a77046 100644 > --- a/drivers/pci/controller/dwc/pci-layerscape.c > +++ b/drivers/pci/controller/dwc/pci-layerscape.c > @@ -30,8 +30,6 @@ > > /* PEX Internal Configuration Registers */ > #define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */ > -#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */ > -#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */ > > #define PCIE_IATU_NUM 6 > > @@ -123,14 +121,6 @@ static int ls_pcie_link_up(struct dw_pcie *pci) > return 1; > } > > -/* Forward error response of outbound non-posted requests */ > -static void ls_pcie_fix_error_response(struct ls_pcie *pcie) > -{ > - struct dw_pcie *pci = pcie->pci; > - > - iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR); > -} > - > static int ls_pcie_host_init(struct pcie_port *pp) > { > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > @@ -142,7 +132,6 @@ static int ls_pcie_host_init(struct pcie_port *pp) > * dw_pcie_setup_rc() will reconfigure the outbound windows. > */ > ls_pcie_disable_outbound_atus(pcie); > - ls_pcie_fix_error_response(pcie); > > dw_pcie_dbi_ro_wr_en(pci); > ls_pcie_clear_multifunction(pcie); > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel