From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp08.au.ibm.com (e23smtp08.au.ibm.com [202.81.31.141]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 6AF141A033E for ; Wed, 17 Feb 2016 14:45:58 +1100 (AEDT) Received: from localhost by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 17 Feb 2016 13:45:57 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 3AFDC2BB005E for ; Wed, 17 Feb 2016 14:45:56 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u1H3jmQQ55574736 for ; Wed, 17 Feb 2016 14:45:56 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u1H3jITT013130 for ; Wed, 17 Feb 2016 14:45:23 +1100 From: Gavin Shan To: linuxppc-dev@lists.ozlabs.org Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, benh@kernel.crashing.org, mpe@ellerman.id.au, aik@ozlabs.ru, dja@axtens.net, bhelgaas@google.com, robherring2@gmail.com, grant.likely@linaro.org, Gavin Shan Subject: [PATCH v8 35/45] powerpc/powernv: Fundamental reset in pnv_pci_reset_secondary_bus() Date: Wed, 17 Feb 2016 14:44:18 +1100 Message-Id: <1455680668-23298-36-git-send-email-gwshan@linux.vnet.ibm.com> In-Reply-To: <1455680668-23298-1-git-send-email-gwshan@linux.vnet.ibm.com> References: <1455680668-23298-1-git-send-email-gwshan@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , In pnv_pci_reset_secondary_bus(), we should issue fundamental reset if any one subordinate device of the specified bus is requesting that. Otherwise, the device might not come up after the reset. Signed-off-by: Gavin Shan --- arch/powerpc/platforms/powernv/eeh-powernv.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c index 593b8dc..c7454ba 100644 --- a/arch/powerpc/platforms/powernv/eeh-powernv.c +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c @@ -866,9 +866,28 @@ static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option) return 0; } +static int pnv_pci_dev_reset_type(struct pci_dev *pdev, void *data) +{ + int *freset = data; + + /* + * Stop the iteration immediately if there has any one + * PCI device requesting fundamental reset. + */ + *freset |= pdev->needs_freset; + return *freset; +} + void pnv_pci_reset_secondary_bus(struct pci_dev *dev) { - pnv_eeh_bridge_reset(dev, EEH_RESET_HOT); + int option, freset = 0; + + if (dev->subordinate) + pci_walk_bus(dev->subordinate, + pnv_pci_dev_reset_type, &freset); + + option = freset ? EEH_RESET_FUNDAMENTAL : EEH_RESET_HOT; + pnv_eeh_bridge_reset(dev, option); pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE); } -- 2.1.0