From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00ADDC55174 for ; Wed, 5 Aug 2026 17:18:48 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hFcZZ5k9Qz2ygW; Thu, 06 Aug 2026 03:18:46 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.105.4.254 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1785950326; cv=none; b=Q457qR1IPdPwlYCcGEJshtjLJD4QgNKUI7FZilhR67a/DZqACnlSO2y1wXL+XunUOY9ksawUIlgIu2OUy6V8yS30mZ+INAJKmmaZLWzptM6nnlEnNMmx1AEy60l1c9CHc4ZTiQTfKA7yJ7nTeAL6daVKPpwvmHne9pnb5b0luNL66eYyE4k8w0YIxHU5HV8+O9lj3CHhdnJG1QMMmSERNYa7FAFkuh6UMa5gh5zgF3/yZ3PaBRtQWffSFWc/iGwqW9ofPtZVUyL0DapGJR5oTbb4Q9CHtlty6dFasfh1TMyoSISQrWWFtc7Fu3a1lpBHyhHXhLDqb1TDy7kll0gL3A== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1785950326; c=relaxed/relaxed; bh=cS+1OPt43LY9PVcLmNXnPTuZJ4WgQujUCM/knEjl0HU=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=RTTbivriS0thxaVk+rQXA94AbQ4WQgrx+W+5aSOtFQ4EAStxmdXV32UzeDtS0QrDAGwb+5/lJiYvJu8CgRaWRJNNd5RNzeCwnC4ojXf5TJFSthJaiOn3PezXsFpWGm0+T5Mc+kbIeDwNbEim5UCmbwT4IiGm376w3qZUstt8NG7BWDt9NzLwFQkAcmwlQiM274D2WWNRBN6Z5A8UrVeQ27dP7c/DiXGkdzqc2DH9U0OEo4bhrTrfyWLxjwYTz+ffiiYSLvb1rXSxRTnEKXzX3R9hlEuFXfMPGq7LCbquI79tQXpcSfvIpMdTjJOeFEPWI7fZUAkpn3k4/s1tPzY26A== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=N/HuuOGd; dkim-atps=neutral; spf=pass (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=helgaas@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=N/HuuOGd; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=helgaas@kernel.org; receiver=lists.ozlabs.org) Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) (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 lists.ozlabs.org (Postfix) with ESMTPS id 4hFcZY3J48z2xdb for ; Thu, 06 Aug 2026 03:18:45 +1000 (AEST) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 25DA46011F; Wed, 5 Aug 2026 17:18:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A10C71F000E9; Wed, 5 Aug 2026 17:18:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785950321; bh=cS+1OPt43LY9PVcLmNXnPTuZJ4WgQujUCM/knEjl0HU=; h=Date:From:To:Cc:Subject:In-Reply-To; b=N/HuuOGdJ4jfuVsLPVIvPkgZ2xNnrprRB7r/nUGJooGCbWrE139e6SSrx7FR0hjRI +TyBc/fziElSkTuwBIQAVqWtVWSFfwAcdYNOi3cJjZv8O6rbCo2qlNMk63qoF5/wk5 kuZWcKDDZ932oqPNnVIJ+HdWY6q2GH3ORzcRGbgpxJc6OsqQTQgTp6+UQfiw0a8KpW fRMjh+lGP77i/eMjTki89xfFrULwI18IME78CpglYlx2twmiBE640OTeGkyE+XGHs7 lu3yg5x/qAc7tkFFRUugrtpqqTt9jvM9chRi8C/NK+tbdlisXGkYjQrMrjYN9XQEGn ogQhEdgpLFOFQ== Date: Wed, 5 Aug 2026 12:18:40 -0500 From: Bjorn Helgaas To: Avinash Roy Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, bhelgaas@google.com, npiggin@gmail.com, chleroy@kernel.org, sbhat@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Avinash Roy Subject: Re: [PATCH] PCI: quirks: Add warm reset quirk for IBM Spyre accelerator Message-ID: <20260805171840.GA2126423@bhelgaas> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260805125132.941270-1-avinash@linux.ibm.com> On Wed, Aug 05, 2026 at 06:21:32PM +0530, Avinash Roy wrote: > From: Shivaprasad G Bhat > > The IBM Spyre accelerator (PCI ID 1014:06a7) requires a dedicated warm > reset method for reliable EEH recovery on pSeries/ppc64 platforms. > > FLR alone is insufficient because it does not re-initialize the Spyre > firmware state machine. On ppc64 with EEH enabled, > pcibios_set_pcie_reset_state() is overridden in > arch/powerpc/kernel/eeh.c to drive the platform-level PERST# signal via > EEH PE operations, which is the correct mechanism for full device > recovery after an EEH event. This makes it sound like this mechanism is needed for EEH recovery for *all* devices, not just Spyre. If that's the case it sounds like we need more than just a Spyre-specific quirk. > The reset function is placed in arch/powerpc/platforms/pseries/pci.c > where the EEH infrastructure is already present, declared in > pseries.h, and registered in the generic pci_dev_reset_methods[] table > in drivers/pci/quirks.c under a CONFIG_PPC_PSERIES guard. > > This reset method is only registered when CONFIG_PPC_PSERIES is enabled, > so it is not available on other platforms. > > Reset sequence: > - Assert PERST# via pcie_warm_reset, hold 250 ms > - Deassert PERST# via pcie_deassert_reset > - Wait 250 ms for PCIe link retrain and device recovery > > Signed-off-by: Avinash Roy > Signed-off-by: Shivaprasad G Bhat > --- > diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c > index 84e4ffe957a8..7aa58d57208f 100644 > --- a/arch/powerpc/platforms/pseries/pci.c > +++ b/arch/powerpc/platforms/pseries/pci.c > @@ -11,6 +11,7 @@ > #include > #include > #include > +#include > > #include > #include > @@ -236,6 +237,41 @@ static void fixup_winbond_82c105(struct pci_dev* dev) > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, > fixup_winbond_82c105); > > +/* > + * Reset Spyre adapter using pci_set_pcie_reset_state() > + * This is specifically for PPC platforms where EEH (Enhanced Error Handling) > + * requires this reset method for proper device recovery. > + */ > +int reset_spyre(struct pci_dev *dev, bool probe) > +{ > + int ret; > + > + if (probe) > + return 0; > + > + /* Assert warm reset */ > + ret = pci_set_pcie_reset_state(dev, pcie_warm_reset); > + if (ret) { > + pci_err(dev, "Failed to assert reset: %d\n", ret); > + return ret; > + } > + > + /* Wait for reset to take effect */ > + msleep(250); > + > + /* Deassert reset */ > + ret = pci_set_pcie_reset_state(dev, pcie_deassert_reset); > + if (ret) { > + pci_err(dev, "Failed to deassert reset: %d\n", ret); > + return ret; > + } > + > + /* Wait for device to recover */ > + msleep(250); > + > + return 0; > +} > + > static enum pci_bus_speed prop_to_pci_speed(u32 prop) > { > switch (prop) { > diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h > index 3968a6970fa8..79c194aeb3c6 100644 > --- a/arch/powerpc/platforms/pseries/pseries.h > +++ b/arch/powerpc/platforms/pseries/pseries.h > @@ -92,6 +92,10 @@ extern struct pci_controller_ops pseries_pci_controller_ops; > int pseries_msi_allocate_domains(struct pci_controller *phb); > void pseries_msi_free_domains(struct pci_controller *phb); > > +/* PCI device reset method for Spyre adapter */ > +struct pci_dev; > +int reset_spyre(struct pci_dev *dev, bool probe); > + > extern int CMO_PrPSP; > extern int CMO_SecPSP; > extern unsigned long CMO_PageSize; > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index b09f27f7846f..1b8ab5d9764b 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -4237,6 +4237,11 @@ static int reset_hinic_vf_dev(struct pci_dev *pdev, bool probe) > return 0; > } > > +#ifdef CONFIG_PPC_PSERIES > +/* Defined in arch/powerpc/platforms/pseries/pci.c */ > +int reset_spyre(struct pci_dev *dev, bool probe); > +#endif > + > static const struct pci_dev_reset_methods pci_dev_reset_methods[] = { > { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82599_SFP_VF, > reset_intel_82599_sfp_virtfn }, > @@ -4252,6 +4257,10 @@ static const struct pci_dev_reset_methods pci_dev_reset_methods[] = { > reset_chelsio_generic_dev }, > { PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HINIC_VF, > reset_hinic_vf_dev }, > +#ifdef CONFIG_PPC_PSERIES > + { PCI_VENDOR_ID_IBM, 0x06a7, > + reset_spyre}, > +#endif > { 0 } > };