From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp08.au.ibm.com ([202.81.31.141]:56860 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753355AbbEAGEi (ORCPT ); Fri, 1 May 2015 02:04:38 -0400 Received: from /spool/local by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 1 May 2015 16:04:36 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 142B02BB0040 for ; Fri, 1 May 2015 16:04:33 +1000 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t4164O6H43974742 for ; Fri, 1 May 2015 16:04:33 +1000 Received: from d23av04.au.ibm.com (localhost [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t4163wFD000678 for ; Fri, 1 May 2015 16:03:59 +1000 From: Gavin Shan To: linuxppc-dev@lists.ozlabs.org Cc: linux-pci@vger.kernel.org, benh@kernel.crashing.org, bhelgaas@google.com, Gavin Shan Subject: [PATCH v4 10/21] powerpc/powernv: Fundamental reset for PCI bus reset Date: Fri, 1 May 2015 16:02:57 +1000 Message-Id: <1430460188-31343-11-git-send-email-gwshan@linux.vnet.ibm.com> In-Reply-To: <1430460188-31343-1-git-send-email-gwshan@linux.vnet.ibm.com> References: <1430460188-31343-1-git-send-email-gwshan@linux.vnet.ibm.com> Sender: linux-pci-owner@vger.kernel.org List-ID: Function pnv_pci_reset_secondary_bus() is used to reset specified PCI bus, which is leaded by root complex or PCI bridge. That means the function shouldn't be called on PCI root bus and the patch removes the logic for that case. Also, some adapters beneath the indicated PCI bus may require fundamental reset in order to successfully reload their firmwares after the reset. The patch translates hot reset to fundamental reset for that case. Signed-off-by: Gavin Shan --- arch/powerpc/platforms/powernv/eeh-powernv.c | 35 +++++++++++++++++++++------- 1 file changed, 26 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c index 3c01095..58e4dcf 100644 --- a/arch/powerpc/platforms/powernv/eeh-powernv.c +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c @@ -888,18 +888,35 @@ static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option) return (rc == OPAL_SUCCESS) ? 0 : -EIO; } -void pnv_pci_reset_secondary_bus(struct pci_dev *dev) +static int pnv_pci_dev_reset_type(struct pci_dev *pdev, void *data) { - struct pci_controller *hose; + int *freset = data; - if (pci_is_root_bus(dev->bus)) { - hose = pci_bus_to_host(dev->bus); - pnv_eeh_phb_reset(hose, EEH_RESET_HOT); - pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE); - } else { - pnv_eeh_bridge_reset(dev, EEH_RESET_HOT); - pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE); + /* + * Stop the iteration immediately if there is any + * one PCI device requesting fundamental reset + */ + *freset |= pdev->needs_freset; + return *freset; +} + +void pnv_pci_reset_secondary_bus(struct pci_dev *pdev) +{ + int option = EEH_RESET_HOT; + int freset = 0; + + /* Check if there're any PCI devices asking for fundamental reset */ + if (pdev->subordinate) { + pci_walk_bus(pdev->subordinate, + pnv_pci_dev_reset_type, + &freset); + if (freset) + option = EEH_RESET_FUNDAMENTAL; } + + /* Issue the requested type of reset */ + pnv_eeh_bridge_reset(pdev, option); + pnv_eeh_bridge_reset(pdev, EEH_RESET_DEACTIVATE); } /** -- 2.1.0