Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030418AbVKHX4A (ORCPT ); Tue, 8 Nov 2005 18:56:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030421AbVKHX4A (ORCPT ); Tue, 8 Nov 2005 18:56:00 -0500 Received: from e5.ny.us.ibm.com ([32.97.182.145]:51869 "EHLO e5.ny.us.ibm.com") by vger.kernel.org with ESMTP id S1030418AbVKHX4A (ORCPT ); Tue, 8 Nov 2005 18:56:00 -0500 Date: Tue, 8 Nov 2005 17:55:48 -0600 To: Greg KH Cc: Paul Mackerras , linuxppc64-dev@ozlabs.org, linux-pci@atrey.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org Subject: [PATCH 2/7] PCI Error Recovery: IPR SCSI device driver Message-ID: <20051108235548.GE19593@austin.ibm.com> References: <20051108234911.GC19593@austin.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051108234911.GC19593@austin.ibm.com> User-Agent: Mutt/1.5.6+20040907i From: linas Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4326 Lines: 133 Please apply. ------ Various PCI bus errors can be signaled by newer PCI controllers. This patch adds the PCI error recovery callbacks to the IPR SCSI device driver. The patch has been tested, and appears to work well. Signed-off-by: Linas Vepstas Signed-off-by: Brian King -- Index: linux-2.6.14-git10/drivers/scsi/ipr.c =================================================================== --- linux-2.6.14-git10.orig/drivers/scsi/ipr.c 2005-11-07 17:24:13.000000000 -0600 +++ linux-2.6.14-git10/drivers/scsi/ipr.c 2005-11-07 17:44:35.415656790 -0600 @@ -5328,6 +5328,92 @@ shutdown_type); } +/* --------------- PCI Error Recovery infrastructure ----------- */ +/** If the PCI slot is frozen, hold off all i/o + * activity; then, as soon as the slot is available again, + * initiate an adapter reset. + */ +static int ipr_reset_freeze(struct ipr_cmnd *ipr_cmd) +{ + /* Disallow new interrupts, avoid loop */ + ipr_cmd->ioa_cfg->allow_interrupts = 0; + list_add_tail(&ipr_cmd->queue, &ipr_cmd->ioa_cfg->pending_q); + ipr_cmd->done = ipr_reset_ioa_job; + return IPR_RC_JOB_RETURN; +} + +/** ipr_eeh_frozen -- called when slot has experience PCI bus error. + * This routine is called to tell us that the PCI bus is down. + * Can't do anything here, except put the device driver into a + * holding pattern, waiting for the PCI bus to come back. + */ +static void ipr_eeh_frozen (struct pci_dev *pdev) +{ + unsigned long flags = 0; + struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev); + + spin_lock_irqsave(ioa_cfg->host->host_lock, flags); + _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_freeze, IPR_SHUTDOWN_NONE); + spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags); +} + +/** ipr_eeh_slot_reset - called when pci slot has been reset. + * + * This routine is called by the pci error recovery recovery + * code after the PCI slot has been reset, just before we + * should resume normal operations. + */ +static pci_ers_result_t ipr_eeh_slot_reset(struct pci_dev *pdev) +{ + unsigned long flags = 0; + struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev); + + spin_lock_irqsave(ioa_cfg->host->host_lock, flags); + _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_restore_cfg_space, + IPR_SHUTDOWN_NONE); + spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags); + + return PCI_ERS_RESULT_RECOVERED; +} + +/** This routine is called when the PCI bus has permanently + * failed. This routine should purge all pending I/O and + * shut down the device driver (close and unload). + */ +static void ipr_eeh_perm_failure(struct pci_dev *pdev) +{ + unsigned long flags = 0; + struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev); + + spin_lock_irqsave(ioa_cfg->host->host_lock, flags); + if (ioa_cfg->sdt_state == WAIT_FOR_DUMP) + ioa_cfg->sdt_state = ABORT_DUMP; + ioa_cfg->reset_retries = IPR_NUM_RESET_RELOAD_RETRIES; + ioa_cfg->in_ioa_bringdown = 1; + ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE); + spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags); +} + +static pci_ers_result_t ipr_eeh_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + switch (state) { + case pci_channel_io_frozen: + ipr_eeh_frozen (pdev); + return PCI_ERS_RESULT_NEED_RESET; + + case pci_channel_io_perm_failure: + ipr_eeh_perm_failure (pdev); + return PCI_ERS_RESULT_DISCONNECT; + break; + default: + break; + } + return PCI_ERS_RESULT_NEED_RESET; +} + +/* ------------- end of PCI Error Recovery suport ----------- */ + /** * ipr_probe_ioa_part2 - Initializes IOAs found in ipr_probe_ioa(..) * @ioa_cfg: ioa cfg struct @@ -6065,12 +6151,18 @@ }; MODULE_DEVICE_TABLE(pci, ipr_pci_table); +static struct pci_error_handlers ipr_err_handler = { + .error_detected = ipr_eeh_error_detected, + .slot_reset = ipr_eeh_slot_reset, +}; + static struct pci_driver ipr_driver = { .name = IPR_NAME, .id_table = ipr_pci_table, .probe = ipr_probe, .remove = ipr_remove, .shutdown = ipr_shutdown, + .err_handler = &ipr_err_handler, }; /** - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/