From patchwork Thu May 30 14:25:12 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lance Ortiz X-Patchwork-Id: 2636921 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 9F00BDFF69 for ; Thu, 30 May 2013 14:34:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757441Ab3E3OeE (ORCPT ); Thu, 30 May 2013 10:34:04 -0400 Received: from g4t0015.houston.hp.com ([15.201.24.18]:46567 "EHLO g4t0015.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757037Ab3E3OeC (ORCPT ); Thu, 30 May 2013 10:34:02 -0400 Received: from g4t0018.houston.hp.com (g4t0018.houston.hp.com [16.234.32.27]) by g4t0015.houston.hp.com (Postfix) with ESMTP id EB7A9895C; Thu, 30 May 2013 14:34:01 +0000 (UTC) Received: from grignak.americas.hpqcorp.net (grignak.americas.hpqcorp.net [16.71.13.117]) by g4t0018.houston.hp.com (Postfix) with ESMTP id 0173310290; Thu, 30 May 2013 14:34:00 +0000 (UTC) From: Lance Ortiz Subject: [PATCH v4] aerdrv: Move cper_print_aer() call out of interrupt context To: bhelgaas@google.com, lance_ortiz@hotmail.com, jiang.liu@huawei.com, tony.luck@intel.com, bp@alien8.de, rostedt@goodmis.org, mchehab@redhat.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 30 May 2013 08:25:12 -0600 Message-ID: <20130530142512.3404.74494.stgit@grignak.americas.hpqcorp.net> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The following warning was seen on 3.9 when a corrected PCIe error was being handled by the AER subsystem. WARNING: at .../drivers/pci/search.c:214 pci_get_dev_by_id+0x8a/0x90() This occurred because a call to pci_get_domain_bus_and_slot() was added to cper_print_pcie() to setup for the call to cper_print_aer(). The warning showed up because cper_print_pcie() is called in an interrupt context and pci_get* functions are not supposed to be called in that context. The solution is to move the cper_print_aer() call out of the interrupt context and into aer_recover_work_func() to avoid any warnings when calling pci_get* functions. v2 - Re-worded header text. Removed prefix arg from cper_print_aer(). Added TODO message in cper_print_aer(). v3 - Changed type of u8* to struct aer_capability_regs* in the code to avoid too much casting based on comment from Bjorn Helgaas. v4 - Removed TODO message. Does not have to do with what this patch is trying to fix. Signed-off-by: Lance Ortiz Acked-by: Borislav Petkov --- drivers/acpi/apei/cper.c | 18 ------------------ drivers/acpi/apei/ghes.c | 4 +++- drivers/pci/pcie/aer/aerdrv_core.c | 5 ++++- drivers/pci/pcie/aer/aerdrv_errprint.c | 4 ++-- include/linux/aer.h | 5 +++-- 5 files changed, 12 insertions(+), 24 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c index 1e5d8a4..8713229 100644 --- a/drivers/acpi/apei/cper.c +++ b/drivers/acpi/apei/cper.c @@ -250,10 +250,6 @@ static const char *cper_pcie_port_type_strs[] = { static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie, const struct acpi_hest_generic_data *gdata) { -#ifdef CONFIG_ACPI_APEI_PCIEAER - struct pci_dev *dev; -#endif - if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE) printk("%s""port_type: %d, %s\n", pfx, pcie->port_type, pcie->port_type < ARRAY_SIZE(cper_pcie_port_type_strs) ? @@ -285,20 +281,6 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie, printk( "%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n", pfx, pcie->bridge.secondary_status, pcie->bridge.control); -#ifdef CONFIG_ACPI_APEI_PCIEAER - dev = pci_get_domain_bus_and_slot(pcie->device_id.segment, - pcie->device_id.bus, pcie->device_id.function); - if (!dev) { - pr_err("PCI AER Cannot get PCI device %04x:%02x:%02x.%d\n", - pcie->device_id.segment, pcie->device_id.bus, - pcie->device_id.slot, pcie->device_id.function); - return; - } - if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) - cper_print_aer(pfx, dev, gdata->error_severity, - (struct aer_capability_regs *) pcie->aer_info); - pci_dev_put(dev); -#endif } static const char *apei_estatus_section_flag_strs[] = { diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index d668a8a..403baf4 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -454,7 +454,9 @@ static void ghes_do_proc(struct ghes *ghes, aer_severity = cper_severity_to_aer(sev); aer_recover_queue(pcie_err->device_id.segment, pcie_err->device_id.bus, - devfn, aer_severity); + devfn, aer_severity, + (struct aer_capability_regs *) + pcie_err->aer_info); } } diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c index 564d97f..120549a 100644 --- a/drivers/pci/pcie/aer/aerdrv_core.c +++ b/drivers/pci/pcie/aer/aerdrv_core.c @@ -582,6 +582,7 @@ struct aer_recover_entry u8 devfn; u16 domain; int severity; + struct aer_capability_regs *regs; }; static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry, @@ -595,7 +596,7 @@ static DEFINE_SPINLOCK(aer_recover_ring_lock); static DECLARE_WORK(aer_recover_work, aer_recover_work_func); void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, - int severity) + int severity, struct aer_capability_regs *aer_regs) { unsigned long flags; struct aer_recover_entry entry = { @@ -603,6 +604,7 @@ void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, .devfn = devfn, .domain = domain, .severity = severity, + .regs = aer_regs, }; spin_lock_irqsave(&aer_recover_ring_lock, flags); @@ -629,6 +631,7 @@ static void aer_recover_work_func(struct work_struct *work) PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn)); continue; } + cper_print_aer(pdev, entry.severity, entry.regs); do_recovery(pdev, entry.severity); pci_dev_put(pdev); } diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c index 5ab1425..2c7c9f5 100644 --- a/drivers/pci/pcie/aer/aerdrv_errprint.c +++ b/drivers/pci/pcie/aer/aerdrv_errprint.c @@ -220,7 +220,7 @@ int cper_severity_to_aer(int cper_severity) } EXPORT_SYMBOL_GPL(cper_severity_to_aer); -void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity, +void cper_print_aer(struct pci_dev *dev, int cper_severity, struct aer_capability_regs *aer) { int aer_severity, layer, agent, status_strs_size, tlp_header_valid = 0; @@ -244,7 +244,7 @@ void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity, agent = AER_GET_AGENT(aer_severity, status); dev_err(&dev->dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n", status, mask); - cper_print_bits(prefix, status, status_strs, status_strs_size); + cper_print_bits("", status, status_strs, status_strs_size); dev_err(&dev->dev, "aer_layer=%s, aer_agent=%s\n", aer_error_layer[layer], aer_agent_string[agent]); if (aer_severity != AER_CORRECTABLE) diff --git a/include/linux/aer.h b/include/linux/aer.h index ec10e1b..737f90a 100644 --- a/include/linux/aer.h +++ b/include/linux/aer.h @@ -49,10 +49,11 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) } #endif -extern void cper_print_aer(const char *prefix, struct pci_dev *dev, +extern void cper_print_aer(struct pci_dev *dev, int cper_severity, struct aer_capability_regs *aer); extern int cper_severity_to_aer(int cper_severity); extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, - int severity); + int severity, + struct aer_capability_regs *aer_regs); #endif //_AER_H_