From patchwork Wed Nov 4 03:28:50 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 7548081 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 618B89F327 for ; Wed, 4 Nov 2015 03:31:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 43DA020462 for ; Wed, 4 Nov 2015 03:31:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8635C20452 for ; Wed, 4 Nov 2015 03:31:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753468AbbKDDbC (ORCPT ); Tue, 3 Nov 2015 22:31:02 -0500 Received: from e28smtp07.in.ibm.com ([122.248.162.7]:35881 "EHLO e28smtp07.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753996AbbKDDbB (ORCPT ); Tue, 3 Nov 2015 22:31:01 -0500 Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 4 Nov 2015 09:00:57 +0530 X-Helo: d28dlp01.in.ibm.com X-MailFrom: weiyang@linux.vnet.ibm.com X-RcptTo: linux-pci@vger.kernel.org Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id B934CE005B for ; Wed, 4 Nov 2015 09:01:12 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay03.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id tA43UuUx44367876 for ; Wed, 4 Nov 2015 09:00:56 +0530 Received: from d28av03.in.ibm.com (localhost [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id tA43Usod007645 for ; Wed, 4 Nov 2015 09:00:55 +0530 Received: from localhost (richards-mbp.cn.ibm.com [9.123.229.42]) by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id tA43UrkL007595; Wed, 4 Nov 2015 09:00:54 +0530 From: Wei Yang To: gwshan@linux.vnet.ibm.com, bhelgaas@google.com, mpe@ellerman.id.au, aik@ozlabs.ru Cc: linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, Wei Yang Subject: [PATCH V12 7/9] powerpc/powernv: Support EEH reset for VF PE Date: Wed, 4 Nov 2015 11:28:50 +0800 Message-Id: <1446607732-4166-8-git-send-email-weiyang@linux.vnet.ibm.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1446607732-4166-1-git-send-email-weiyang@linux.vnet.ibm.com> References: <1446607732-4166-1-git-send-email-weiyang@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15110403-0025-0000-0000-000007E1E1C1 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP PEs for VFs don't have primary bus. So they have to have their own reset backend, which is used during EEH recovery. The patch implements the reset backend for VF's PE by issuing FLR or AF FLR to the VFs, which are contained in the PE. Signed-off-by: Wei Yang --- arch/powerpc/include/asm/eeh.h | 1 + arch/powerpc/kernel/eeh.c | 9 +- arch/powerpc/platforms/powernv/eeh-powernv.c | 133 ++++++++++++++++++++++++++- 3 files changed, 139 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h index ec21f8f..331c856 100644 --- a/arch/powerpc/include/asm/eeh.h +++ b/arch/powerpc/include/asm/eeh.h @@ -136,6 +136,7 @@ struct eeh_dev { int pcix_cap; /* Saved PCIx capability */ int pcie_cap; /* Saved PCIe capability */ int aer_cap; /* Saved AER capability */ + int af_cap; /* Saved AF capability */ struct eeh_pe *pe; /* Associated PE */ struct list_head list; /* Form link list in the PE */ struct pci_controller *phb; /* Associated PHB */ diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index e968533..41a4b30 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -760,7 +760,8 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat case pcie_deassert_reset: eeh_ops->reset(pe, EEH_RESET_DEACTIVATE); eeh_unfreeze_pe(pe, false); - eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED); eeh_pe_dev_traverse(pe, eeh_restore_dev_state, dev); eeh_pe_state_clear(pe, EEH_PE_ISOLATED); break; @@ -768,14 +769,16 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat eeh_pe_state_mark_with_cfg(pe, EEH_PE_ISOLATED); eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); - eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); eeh_ops->reset(pe, EEH_RESET_HOT); break; case pcie_warm_reset: eeh_pe_state_mark_with_cfg(pe, EEH_PE_ISOLATED); eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); - eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL); break; default: diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c index 131c7d0..4de247a 100644 --- a/arch/powerpc/platforms/powernv/eeh-powernv.c +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c @@ -404,6 +404,7 @@ static void *pnv_eeh_probe(struct pci_dn *pdn, void *data) edev->pcix_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_PCIX); edev->pcie_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_EXP); edev->aer_cap = pnv_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR); + edev->af_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_AF); if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) { edev->mode |= EEH_DEV_BRIDGE; if (edev->pcie_cap) { @@ -893,6 +894,126 @@ static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option) return 0; } +static void pnv_eeh_wait_for_pending(struct pci_dn *pdn, int pos, + u16 mask, const char *reset_type) +{ + struct eeh_dev *edev = pdn_to_eeh_dev(pdn); + int i, status = 0; + + /* Wait for Transaction Pending bit to be cleared */ + for (i = 0; i < 4; i++) { + eeh_ops->read_config(pdn, pos, 2, &status); + if (!(status & mask)) + return; + + msleep((1 << i) * 100); + } + + pr_warn("%s: Pending transaction while issuing %s FLR to %04x:%02x:%02x.%01x\n", + __func__, reset_type, + edev->phb->global_number, pdn->busno, + PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn)); +} + +static int pnv_eeh_do_flr(struct pci_dn *pdn, int option) +{ + struct eeh_dev *edev = pdn_to_eeh_dev(pdn); + u32 reg = 0; + + if (WARN_ON(!edev->pcie_cap)) + return -ENOTTY; + + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCAP, 4, ®); + if (!(reg & PCI_EXP_DEVCAP_FLR)) + return -ENOTTY; + + switch (option) { + case EEH_RESET_HOT: + case EEH_RESET_FUNDAMENTAL: + pnv_eeh_wait_for_pending(pdn, edev->pcie_cap + PCI_EXP_DEVSTA, + PCI_EXP_DEVSTA_TRPND, ""); + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL, + 4, ®); + reg |= PCI_EXP_DEVCTL_BCR_FLR; + eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL, + 4, reg); + msleep(EEH_PE_RST_HOLD_TIME); + break; + case EEH_RESET_DEACTIVATE: + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL, + 4, ®); + reg &= ~PCI_EXP_DEVCTL_BCR_FLR; + eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL, + 4, reg); + msleep(EEH_PE_RST_SETTLE_TIME); + break; + } + + return 0; +} + +static int pnv_eeh_do_af_flr(struct pci_dn *pdn, int option) +{ + struct eeh_dev *edev = pdn_to_eeh_dev(pdn); + u32 cap = 0; + + if (WARN_ON(!edev->af_cap)) + return -ENOTTY; + + eeh_ops->read_config(pdn, edev->af_cap + PCI_AF_CAP, 1, &cap); + if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) + return -ENOTTY; + + switch (option) { + case EEH_RESET_HOT: + case EEH_RESET_FUNDAMENTAL: + /* + * Wait for Transaction Pending bit to clear. A word-aligned + * test is used, so we use the conrol offset rather than status + * and shift the test bit to match. + */ + pnv_eeh_wait_for_pending(pdn, edev->af_cap + PCI_AF_CTRL, + PCI_AF_STATUS_TP << 8, "AF"); + eeh_ops->write_config(pdn, edev->af_cap + PCI_AF_CTRL, + 1, PCI_AF_CTRL_FLR); + msleep(EEH_PE_RST_HOLD_TIME); + break; + case EEH_RESET_DEACTIVATE: + eeh_ops->write_config(pdn, edev->af_cap + PCI_AF_CTRL, 1, 0); + msleep(EEH_PE_RST_SETTLE_TIME); + break; + } + + return 0; +} + +static int pnv_eeh_reset_vf(struct pci_dn *pdn, int option) +{ + int ret; + + ret = pnv_eeh_do_flr(pdn, option); + if (ret != -ENOTTY) + return ret; + + return pnv_eeh_do_af_flr(pdn, option); +} + +static int pnv_eeh_vf_pe_reset(struct eeh_pe *pe, int option) +{ + struct eeh_dev *edev, *tmp; + struct pci_dn *pdn; + int ret; + + eeh_pe_for_each_dev(pe, edev, tmp) { + pdn = eeh_dev_to_pdn(edev); + ret = pnv_eeh_reset_vf(pdn, option); + if (ret) + return ret; + } + + return 0; +} + void pnv_pci_reset_secondary_bus(struct pci_dev *dev) { struct pci_controller *hose; @@ -968,7 +1089,9 @@ static int pnv_eeh_reset(struct eeh_pe *pe, int option) } bus = eeh_pe_bus_get(pe); - if (pci_is_root_bus(bus) || + if (pe->type & EEH_PE_VF) + ret = pnv_eeh_vf_pe_reset(pe, option); + else if (pci_is_root_bus(bus) || pci_is_root_bus(bus->parent)) ret = pnv_eeh_root_reset(hose, option); else @@ -1108,6 +1231,14 @@ static inline bool pnv_eeh_cfg_blocked(struct pci_dn *pdn) if (!edev || !edev->pe) return false; + /* + * We will issue FLR or AF FLR to all VFs, which are contained + * in VF PE. It relies on the EEH PCI config accessors. So we + * can't block them during the window. + */ + if (edev->physfn && (edev->pe->state & EEH_PE_RESET)) + return false; + if (edev->pe->state & EEH_PE_CFG_BLOCKED) return true;