From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40sWWB4DhqzF1S9 for ; Fri, 25 May 2018 13:11:50 +1000 (AEST) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4P34NS6089720 for ; Thu, 24 May 2018 23:11:47 -0400 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 2j64tuucn8-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 24 May 2018 23:11:47 -0400 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 25 May 2018 04:11:46 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w4P3BiRG51445936 for ; Fri, 25 May 2018 03:11:44 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 423EB52047 for ; Fri, 25 May 2018 03:01:40 +0100 (BST) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 94F005203F for ; Fri, 25 May 2018 03:01:39 +0100 (BST) Received: from tungsten.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 6BD0AA039D for ; Fri, 25 May 2018 13:11:40 +1000 (AEST) From: Sam Bobroff To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 07/13] powerpc/eeh: Clean up pci_ers_result handling Date: Fri, 25 May 2018 13:11:34 +1000 In-Reply-To: References: In-Reply-To: References: Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , As EEH event handling progresses, a cumulative result of type pci_ers_result is built up by (some of) the eeh_report_*() functions using either: if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; if (*res == PCI_ERS_RESULT_NONE) *res = rc; or: if ((*res == PCI_ERS_RESULT_NONE) || (*res == PCI_ERS_RESULT_RECOVERED)) *res = rc; if (*res == PCI_ERS_RESULT_DISCONNECT && rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; (Where *res is the accumulator.) However, the intent is not immediately clear and the result in some situations is order dependent. Address this by assigning a priority to each result value, and always merging to the highest priority. This renders the intent clear, and provides a stable value for all orderings. Signed-off-by: Sam Bobroff --- ====== v1 -> v2: ====== * Added the value, and missing newline, to some WARN()s. * Improved name of merge_result() to pci_ers_merge_result(). * Adjusted the result priorities so that unknown doesn't overlap with _NONE. arch/powerpc/kernel/eeh_driver.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 188d15c4fe3a..2d3cac584899 100644 --- a/arch/powerpc/kernel/eeh_driver.c +++ b/arch/powerpc/kernel/eeh_driver.c @@ -39,6 +39,29 @@ struct eeh_rmv_data { int removed; }; +static int eeh_result_priority(enum pci_ers_result result) +{ + switch (result) { + case PCI_ERS_RESULT_NONE: return 1; + case PCI_ERS_RESULT_NO_AER_DRIVER: return 2; + case PCI_ERS_RESULT_RECOVERED: return 3; + case PCI_ERS_RESULT_CAN_RECOVER: return 4; + case PCI_ERS_RESULT_DISCONNECT: return 5; + case PCI_ERS_RESULT_NEED_RESET: return 6; + default: + WARN_ONCE(1, "Unknown pci_ers_result value: %d\n", (int)result); + return 0; + } +}; + +static enum pci_ers_result pci_ers_merge_result(enum pci_ers_result old, + enum pci_ers_result new) +{ + if (eeh_result_priority(new) > eeh_result_priority(old)) + return new; + return old; +} + /** * eeh_pcid_get - Get the PCI device driver * @pdev: PCI device @@ -206,9 +229,7 @@ static void *eeh_report_error(struct eeh_dev *edev, void *userdata) rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen); - /* A driver that needs a reset trumps all others */ - if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; - if (*res == PCI_ERS_RESULT_NONE) *res = rc; + *res = pci_ers_merge_result(*res, rc); edev->in_error = true; pci_uevent_ers(dev, PCI_ERS_RESULT_NONE); @@ -249,9 +270,7 @@ static void *eeh_report_mmio_enabled(struct eeh_dev *edev, void *userdata) rc = driver->err_handler->mmio_enabled(dev); - /* A driver that needs a reset trumps all others */ - if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; - if (*res == PCI_ERS_RESULT_NONE) *res = rc; + *res = pci_ers_merge_result(*res, rc); out: eeh_pcid_put(dev); @@ -294,10 +313,7 @@ static void *eeh_report_reset(struct eeh_dev *edev, void *userdata) goto out; rc = driver->err_handler->slot_reset(dev); - if ((*res == PCI_ERS_RESULT_NONE) || - (*res == PCI_ERS_RESULT_RECOVERED)) *res = rc; - if (*res == PCI_ERS_RESULT_DISCONNECT && - rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; + *res = pci_ers_merge_result(*res, rc); out: eeh_pcid_put(dev); -- 2.16.1.74.g9b0b1f47b