From patchwork Tue Jun 9 07:22:03 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yanmin Zhang X-Patchwork-Id: 28870 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n597M0WU007749 for ; Tue, 9 Jun 2009 07:22:00 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754136AbZFIHV4 (ORCPT ); Tue, 9 Jun 2009 03:21:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754260AbZFIHV4 (ORCPT ); Tue, 9 Jun 2009 03:21:56 -0400 Received: from mga10.intel.com ([192.55.52.92]:29496 "EHLO fmsmga102.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752394AbZFIHVz (ORCPT ); Tue, 9 Jun 2009 03:21:55 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 09 Jun 2009 00:14:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.41,330,1241420400"; d="scan'208";a="464676916" Received: from ymzhang.sh.intel.com (HELO [10.239.13.146]) ([10.239.13.146]) by fmsmga002.fm.intel.com with ESMTP; 09 Jun 2009 00:15:57 -0700 Subject: [PATCH V3: 1/3] pci: Provide Multiple Error Received and no error source id support on AER From: "Zhang, Yanmin" To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org Cc: Jesse Barnes Date: Tue, 09 Jun 2009 15:22:03 +0800 Message-Id: <1244532123.2560.219.camel@ymzhang> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1 (2.22.1-2.fc9) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org  Changelog since V2: 1) Probe devices under the root port when the bus id of the source id is equal to 0; V2 does so when device id is equal to 0; 2) Add more comments on critical path of finding devices. Changelog since V1: Version 2 adds nosourceid, a boot parameter. When aerdriver.nosourceid=y, aerdriver doesn't use the source id saved by root port. Instead, it searches the device tree under the root port to find the reporter. So if hardware has errata and root port saves a bad source id, aerdriver still could find the reporter. There are 2 scenarios under which aerdriver searches the device tree under root port: 1) nosourceid=n and error source id is equal to 0; 2) nosourceid=y. Based on PCI Express AER specs, a root port might receive multiple TLP errors while it could only save a correctable error source id and an uncorrectable error source id at the same time. In addition, some root port hardware might be unable to provide a correct source id, i.e., the source id, or the bus id part of the source id provided by root port might be equal to 0. The patchset implements the support in kernel by searching the device tree under the root port. Patch 1 changes parameter cb of function pci_walk_bus to return a value. When cb return non-zero, pci_walk_bus stops more searching on the device tree. Signed-off-by: Zhang Yanmin --- -- 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 --- linux-2.6.30-rc3/arch/powerpc/platforms/pseries/eeh_driver.c 2009-04-27 15:48:28.000000000 +0800 +++ linux-2.6.30-rc3_pciwalk/arch/powerpc/platforms/pseries/eeh_driver.c 2009-04-29 10:39:41.000000000 +0800 @@ -122,7 +122,7 @@ static void eeh_enable_irq(struct pci_de * passed back in "userdata". */ -static void eeh_report_error(struct pci_dev *dev, void *userdata) +static int eeh_report_error(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; struct pci_driver *driver = dev->driver; @@ -130,19 +130,21 @@ static void eeh_report_error(struct pci_ dev->error_state = pci_channel_io_frozen; if (!driver) - return; + return 0; eeh_disable_irq(dev); if (!driver->err_handler || !driver->err_handler->error_detected) - return; + return 0; 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; + + return 0; } /** @@ -153,7 +155,7 @@ static void eeh_report_error(struct pci_ * Cumulative response passed back in "userdata". */ -static void eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) +static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; struct pci_driver *driver = dev->driver; @@ -161,26 +163,28 @@ static void eeh_report_mmio_enabled(stru if (!driver || !driver->err_handler || !driver->err_handler->mmio_enabled) - return; + return 0; 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; + + return 0; } /** * eeh_report_reset - tell device that slot has been reset */ -static void eeh_report_reset(struct pci_dev *dev, void *userdata) +static int eeh_report_reset(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; struct pci_driver *driver = dev->driver; if (!driver) - return; + return 0; dev->error_state = pci_channel_io_normal; @@ -188,35 +192,39 @@ static void eeh_report_reset(struct pci_ if (!driver->err_handler || !driver->err_handler->slot_reset) - return; + return 0; 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; + + return 0; } /** * eeh_report_resume - tell device to resume normal operations */ -static void eeh_report_resume(struct pci_dev *dev, void *userdata) +static int eeh_report_resume(struct pci_dev *dev, void *userdata) { struct pci_driver *driver = dev->driver; dev->error_state = pci_channel_io_normal; if (!driver) - return; + return 0; eeh_enable_irq(dev); if (!driver->err_handler || !driver->err_handler->resume) - return; + return 0; driver->err_handler->resume(dev); + + return 0; } /** @@ -226,22 +234,24 @@ static void eeh_report_resume(struct pci * dead, and that no further recovery attempts will be made on it. */ -static void eeh_report_failure(struct pci_dev *dev, void *userdata) +static int eeh_report_failure(struct pci_dev *dev, void *userdata) { struct pci_driver *driver = dev->driver; dev->error_state = pci_channel_io_perm_failure; if (!driver) - return; + return 0; eeh_disable_irq(dev); if (!driver->err_handler || !driver->err_handler->error_detected) - return; + return 0; driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); + + return 0; } /* ------------------------------------------------------- */ --- linux-2.6.30-rc3/drivers/pci/bus.c 2009-04-27 15:48:31.000000000 +0800 +++ linux-2.6.30-rc3_pciwalk/drivers/pci/bus.c 2009-05-05 14:10:36.000000000 +0800 @@ -201,13 +201,18 @@ void pci_enable_bridges(struct pci_bus * * Walk the given bus, including any bridged devices * on buses under this bus. Call the provided callback * on each device found. + * + * We check the return of @cb each time. If it returns anything + * other than 0, we break out. + * */ -void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), +void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata) { struct pci_dev *dev; struct pci_bus *bus; struct list_head *next; + int retval; bus = top; down_read(&pci_bus_sem); @@ -231,8 +236,10 @@ void pci_walk_bus(struct pci_bus *top, v /* Run device routines with the device locked */ down(&dev->dev.sem); - cb(dev, userdata); + retval = cb(dev, userdata); up(&dev->dev.sem); + if (retval) + break; } up_read(&pci_bus_sem); } --- linux-2.6.30-rc3/drivers/pci/pcie/aer/aerdrv_core.c 2009-04-27 15:48:31.000000000 +0800 +++ linux-2.6.30-rc3_pciwalk/drivers/pci/pcie/aer/aerdrv_core.c 2009-04-29 10:37:16.000000000 +0800 @@ -109,19 +109,21 @@ int pci_cleanup_aer_correct_error_status #endif /* 0 */ -static void set_device_error_reporting(struct pci_dev *dev, void *data) +static int set_device_error_reporting(struct pci_dev *dev, void *data) { bool enable = *((bool *)data); if (dev->pcie_type != PCIE_RC_PORT && dev->pcie_type != PCIE_SW_UPSTREAM_PORT && dev->pcie_type != PCIE_SW_DOWNSTREAM_PORT) - return; + return 0; if (enable) pci_enable_pcie_error_reporting(dev); else pci_disable_pcie_error_reporting(dev); + + return 0; } /** @@ -205,7 +207,7 @@ static struct device* find_source_device return NULL; } -static void report_error_detected(struct pci_dev *dev, void *data) +static int report_error_detected(struct pci_dev *dev, void *data) { pci_ers_result_t vote; struct pci_error_handlers *err_handler; @@ -230,16 +232,16 @@ static void report_error_detected(struct dev->driver ? "no AER-aware driver" : "no driver"); } - return; + return 0; } err_handler = dev->driver->err_handler; vote = err_handler->error_detected(dev, result_data->state); result_data->result = merge_result(result_data->result, vote); - return; + return 0; } -static void report_mmio_enabled(struct pci_dev *dev, void *data) +static int report_mmio_enabled(struct pci_dev *dev, void *data) { pci_ers_result_t vote; struct pci_error_handlers *err_handler; @@ -249,15 +251,15 @@ static void report_mmio_enabled(struct p if (!dev->driver || !dev->driver->err_handler || !dev->driver->err_handler->mmio_enabled) - return; + return 0; err_handler = dev->driver->err_handler; vote = err_handler->mmio_enabled(dev); result_data->result = merge_result(result_data->result, vote); - return; + return 0; } -static void report_slot_reset(struct pci_dev *dev, void *data) +static int report_slot_reset(struct pci_dev *dev, void *data) { pci_ers_result_t vote; struct pci_error_handlers *err_handler; @@ -267,15 +269,15 @@ static void report_slot_reset(struct pci if (!dev->driver || !dev->driver->err_handler || !dev->driver->err_handler->slot_reset) - return; + return 0; err_handler = dev->driver->err_handler; vote = err_handler->slot_reset(dev); result_data->result = merge_result(result_data->result, vote); - return; + return 0; } -static void report_resume(struct pci_dev *dev, void *data) +static int report_resume(struct pci_dev *dev, void *data) { struct pci_error_handlers *err_handler; @@ -284,11 +286,11 @@ static void report_resume(struct pci_dev if (!dev->driver || !dev->driver->err_handler || !dev->driver->err_handler->resume) - return; + return 0; err_handler = dev->driver->err_handler; err_handler->resume(dev); - return; + return 0; } /** @@ -305,7 +307,7 @@ static void report_resume(struct pci_dev static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, enum pci_channel_state state, char *error_mesg, - void (*cb)(struct pci_dev *, void *)) + int (*cb)(struct pci_dev *, void *)) { struct aer_broadcast_data result_data; --- linux-2.6.30-rc3/include/linux/pci.h 2009-04-27 15:48:33.000000000 +0800 +++ linux-2.6.30-rc3_pciwalk/include/linux/pci.h 2009-04-29 10:31:58.000000000 +0800 @@ -790,7 +790,7 @@ const struct pci_device_id *pci_match_id int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass); -void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), +void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata); int pci_cfg_space_size_ext(struct pci_dev *dev); int pci_cfg_space_size(struct pci_dev *dev);