From 4fdd7c7aabbec3aa9e5dc41c129bc9f6aed7e615 Mon Sep 17 00:00:00 2001 From: Brian King Date: Thu, 26 Mar 2015 11:23:50 -0500 Subject: [PATCH] ipr: Reboot speed improvements Currently when performing a reboot with an ipr adapter, the adapter gets shutdown completely, flushing all write cache, as well as performing a full hardware reset of the card during the shutdown phase of the old kernel. This ensures the adapter is in a fully quiesced state across the reboot. There are scenarios, however, such as when performing kexec, where this full adapter shutdown is not required and not desired, since it can make the reboot process take noticeably longer. This patch adds a module parameter to allow for skipping the full shutdown during reboot. Rather than performing a full adapter shutdown and reset, we simply cancel any outstanding error buffers, place the adapter into a state where it has no memory of any DMA addresses from the old kernel, then disable the device. This significantly speeds up kexec boot, particularly in configurations with multiple ipr adapters. Signed-off-by: Brian King Reviewed-by: Wen Xiong Reviewed-by: Daniel Kreling Signed-off-by: James Bottomley --- drivers/scsi/ipr.c | 160 ++++++++++++++++++++++++++++++++++++++++++--- drivers/scsi/ipr.h | 6 +- 2 files changed, 157 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index 9219953ee949..190d0ae0193f 100644 --- a/drivers/scsi/ipr.c +++ b/drivers/scsi/ipr.c @@ -99,6 +99,7 @@ static unsigned int ipr_debug = 0; static unsigned int ipr_max_devs = IPR_DEFAULT_SIS64_DEVS; static unsigned int ipr_dual_ioa_raid = 1; static unsigned int ipr_number_of_msix = 2; +static unsigned int ipr_fast_reboot; static DEFINE_SPINLOCK(ipr_driver_lock); /* This table describes the differences between DMA controller chips */ @@ -221,6 +222,8 @@ MODULE_PARM_DESC(max_devs, "Specify the maximum number of physical devices. " "[Default=" __stringify(IPR_DEFAULT_SIS64_DEVS) "]"); module_param_named(number_of_msix, ipr_number_of_msix, int, 0); MODULE_PARM_DESC(number_of_msix, "Specify the number of MSIX interrupts to use on capable adapters (1 - 16). (default:2)"); +module_param_named(fast_reboot, ipr_fast_reboot, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(fast_reboot, "Skip adapter shutdown during reboot. Set to 1 to enable. (default: 0)"); MODULE_LICENSE("GPL"); MODULE_VERSION(IPR_DRIVER_VERSION); @@ -1462,7 +1465,8 @@ static void ipr_process_ccn(struct ipr_cmnd *ipr_cmd) list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q); if (ioasc) { - if (ioasc != IPR_IOASC_IOA_WAS_RESET) + if (ioasc != IPR_IOASC_IOA_WAS_RESET && + ioasc != IPR_IOASC_ABORTED_CMD_TERM_BY_HOST) dev_err(&ioa_cfg->pdev->dev, "Host RCB failed with IOASC: 0x%08X\n", ioasc); @@ -2566,7 +2570,8 @@ static void ipr_process_error(struct ipr_cmnd *ipr_cmd) ipr_handle_log_data(ioa_cfg, hostrcb); if (fd_ioasc == IPR_IOASC_NR_IOA_RESET_REQUIRED) ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_ABBREV); - } else if (ioasc != IPR_IOASC_IOA_WAS_RESET) { + } else if (ioasc != IPR_IOASC_IOA_WAS_RESET && + ioasc != IPR_IOASC_ABORTED_CMD_TERM_BY_HOST) { dev_err(&ioa_cfg->pdev->dev, "Host RCB failed with IOASC: 0x%08X\n", ioasc); } @@ -5379,9 +5384,6 @@ static irqreturn_t ipr_handle_other_interrupt(struct ipr_ioa_cfg *ioa_cfg, if (int_reg & IPR_PCII_IOA_TRANS_TO_OPER) { /* Mask the interrupt */ writel(IPR_PCII_IOA_TRANS_TO_OPER, ioa_cfg->regs.set_interrupt_mask_reg); - - /* Clear the interrupt */ - writel(IPR_PCII_IOA_TRANS_TO_OPER, ioa_cfg->regs.clr_interrupt_reg); int_reg = readl(ioa_cfg->regs.sense_interrupt_reg); list_del(&ioa_cfg->reset_cmd->queue); @@ -8478,6 +8480,122 @@ static int ipr_reset_alert(struct ipr_cmnd *ipr_cmd) return IPR_RC_JOB_RETURN; } +/** + * ipr_reset_quiesce_done - Complete IOA disconnect + * @ipr_cmd: ipr command struct + * + * Description: Freeze the adapter to complete quiesce processing + * + * Return value: + * IPR_RC_JOB_CONTINUE + **/ +static int ipr_reset_quiesce_done(struct ipr_cmnd *ipr_cmd) +{ + struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg; + + ENTER; + ipr_cmd->job_step = ipr_ioa_bringdown_done; + ipr_mask_and_clear_interrupts(ioa_cfg, ~IPR_PCII_IOA_TRANS_TO_OPER); + LEAVE; + return IPR_RC_JOB_CONTINUE; +} + +/** + * ipr_reset_cancel_hcam_done - Check for outstanding commands + * @ipr_cmd: ipr command struct + * + * Description: Ensure nothing is outstanding to the IOA and + * proceed with IOA disconnect. Otherwise reset the IOA. + * + * Return value: + * IPR_RC_JOB_RETURN / IPR_RC_JOB_CONTINUE + **/ +static int ipr_reset_cancel_hcam_done(struct ipr_cmnd *ipr_cmd) +{ + struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg; + struct ipr_cmnd *loop_cmd; + struct ipr_hrr_queue *hrrq; + int rc = IPR_RC_JOB_CONTINUE; + int count = 0; + + ENTER; + ipr_cmd->job_step = ipr_reset_quiesce_done; + + for_each_hrrq(hrrq, ioa_cfg) { + spin_lock(&hrrq->_lock); + list_for_each_entry(loop_cmd, &hrrq->hrrq_pending_q, queue) { + count++; + ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE); + list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q); + rc = IPR_RC_JOB_RETURN; + break; + } + spin_unlock(&hrrq->_lock); + + if (count) + break; + } + + LEAVE; + return rc; +} + +/** + * ipr_reset_cancel_hcam - Cancel outstanding HCAMs + * @ipr_cmd: ipr command struct + * + * Description: Cancel any oustanding HCAMs to the IOA. + * + * Return value: + * IPR_RC_JOB_CONTINUE / IPR_RC_JOB_RETURN + **/ +static int ipr_reset_cancel_hcam(struct ipr_cmnd *ipr_cmd) +{ + struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg; + int rc = IPR_RC_JOB_CONTINUE; + struct ipr_cmd_pkt *cmd_pkt; + struct ipr_cmnd *hcam_cmd; + struct ipr_hrr_queue *hrrq = &ioa_cfg->hrrq[IPR_INIT_HRRQ]; + + ENTER; + ipr_cmd->job_step = ipr_reset_cancel_hcam_done; + + if (!hrrq->ioa_is_dead) { + if (!list_empty(&ioa_cfg->hostrcb_pending_q)) { + list_for_each_entry(hcam_cmd, &hrrq->hrrq_pending_q, queue) { + if (hcam_cmd->ioarcb.cmd_pkt.cdb[0] != IPR_HOST_CONTROLLED_ASYNC) + continue; + + ipr_cmd->ioarcb.res_handle = cpu_to_be32(IPR_IOA_RES_HANDLE); + ipr_cmd->ioarcb.cmd_pkt.request_type = IPR_RQTYPE_IOACMD; + cmd_pkt = &ipr_cmd->ioarcb.cmd_pkt; + cmd_pkt->request_type = IPR_RQTYPE_IOACMD; + cmd_pkt->cdb[0] = IPR_CANCEL_REQUEST; + cmd_pkt->cdb[1] = IPR_CANCEL_64BIT_IOARCB; + cmd_pkt->cdb[10] = ((u64) hcam_cmd->dma_addr >> 56) & 0xff; + cmd_pkt->cdb[11] = ((u64) hcam_cmd->dma_addr >> 48) & 0xff; + cmd_pkt->cdb[12] = ((u64) hcam_cmd->dma_addr >> 40) & 0xff; + cmd_pkt->cdb[13] = ((u64) hcam_cmd->dma_addr >> 32) & 0xff; + cmd_pkt->cdb[2] = ((u64) hcam_cmd->dma_addr >> 24) & 0xff; + cmd_pkt->cdb[3] = ((u64) hcam_cmd->dma_addr >> 16) & 0xff; + cmd_pkt->cdb[4] = ((u64) hcam_cmd->dma_addr >> 8) & 0xff; + cmd_pkt->cdb[5] = ((u64) hcam_cmd->dma_addr) & 0xff; + + ipr_do_req(ipr_cmd, ipr_reset_ioa_job, ipr_timeout, + IPR_CANCEL_TIMEOUT); + + rc = IPR_RC_JOB_RETURN; + ipr_cmd->job_step = ipr_reset_cancel_hcam; + break; + } + } + } else + ipr_cmd->job_step = ipr_reset_alert; + + LEAVE; + return rc; +} + /** * ipr_reset_ucode_download_done - Microcode download completion * @ipr_cmd: ipr command struct @@ -8560,7 +8678,9 @@ static int ipr_reset_shutdown_ioa(struct ipr_cmnd *ipr_cmd) int rc = IPR_RC_JOB_CONTINUE; ENTER; - if (shutdown_type != IPR_SHUTDOWN_NONE && + if (shutdown_type == IPR_SHUTDOWN_QUIESCE) + ipr_cmd->job_step = ipr_reset_cancel_hcam; + else if (shutdown_type != IPR_SHUTDOWN_NONE && !ioa_cfg->hrrq[IPR_INIT_HRRQ].ioa_is_dead) { ipr_cmd->ioarcb.res_handle = cpu_to_be32(IPR_IOA_RES_HANDLE); ipr_cmd->ioarcb.cmd_pkt.request_type = IPR_RQTYPE_IOACMD; @@ -10035,6 +10155,7 @@ static void ipr_shutdown(struct pci_dev *pdev) { struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev); unsigned long lock_flags = 0; + enum ipr_shutdown_type shutdown_type = IPR_SHUTDOWN_NORMAL; int i; spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags); @@ -10050,9 +10171,31 @@ static void ipr_shutdown(struct pci_dev *pdev) spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags); } - ipr_initiate_ioa_bringdown(ioa_cfg, IPR_SHUTDOWN_NORMAL); + if (ipr_fast_reboot && system_state == SYSTEM_RESTART && ioa_cfg->sis64) + shutdown_type = IPR_SHUTDOWN_QUIESCE; + + ipr_initiate_ioa_bringdown(ioa_cfg, shutdown_type); spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags); wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload); + if (ipr_fast_reboot && system_state == SYSTEM_RESTART && ioa_cfg->sis64) { + if (ioa_cfg->intr_flag == IPR_USE_MSI || + ioa_cfg->intr_flag == IPR_USE_MSIX) { + int i; + for (i = 0; i < ioa_cfg->nvectors; i++) + free_irq(ioa_cfg->vectors_info[i].vec, + &ioa_cfg->hrrq[i]); + } + + if (ioa_cfg->intr_flag == IPR_USE_MSI) { + pci_disable_msi(ioa_cfg->pdev); + ioa_cfg->intr_flag &= ~IPR_USE_MSI; + } else if (ioa_cfg->intr_flag == IPR_USE_MSIX) { + pci_disable_msix(ioa_cfg->pdev); + ioa_cfg->intr_flag &= ~IPR_USE_MSIX; + } + + pci_disable_device(ioa_cfg->pdev); + } } static struct pci_device_id ipr_pci_table[] = { @@ -10210,7 +10353,8 @@ static int ipr_halt(struct notifier_block *nb, ulong event, void *buf) list_for_each_entry(ioa_cfg, &ipr_ioa_head, queue) { spin_lock_irqsave(ioa_cfg->host->host_lock, flags); - if (!ioa_cfg->hrrq[IPR_INIT_HRRQ].allow_cmds) { + if (!ioa_cfg->hrrq[IPR_INIT_HRRQ].allow_cmds || + (ipr_fast_reboot && event == SYS_RESTART && ioa_cfg->sis64)) { spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags); continue; } diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h index ec03b42fa2b9..34eec5bcdce0 100644 --- a/drivers/scsi/ipr.h +++ b/drivers/scsi/ipr.h @@ -196,6 +196,8 @@ /* * Adapter Commands */ +#define IPR_CANCEL_REQUEST 0xC0 +#define IPR_CANCEL_64BIT_IOARCB 0x01 #define IPR_QUERY_RSRC_STATE 0xC2 #define IPR_RESET_DEVICE 0xC3 #define IPR_RESET_TYPE_SELECT 0x80 @@ -222,6 +224,7 @@ #define IPR_ABBREV_SHUTDOWN_TIMEOUT (10 * HZ) #define IPR_DUAL_IOA_ABBR_SHUTDOWN_TO (2 * 60 * HZ) #define IPR_DEVICE_RESET_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) +#define IPR_CANCEL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) #define IPR_CANCEL_ALL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) #define IPR_ABORT_TASK_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) #define IPR_INTERNAL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) @@ -1402,7 +1405,8 @@ enum ipr_shutdown_type { IPR_SHUTDOWN_NORMAL = 0x00, IPR_SHUTDOWN_PREPARE_FOR_NORMAL = 0x40, IPR_SHUTDOWN_ABBREV = 0x80, - IPR_SHUTDOWN_NONE = 0x100 + IPR_SHUTDOWN_NONE = 0x100, + IPR_SHUTDOWN_QUIESCE = 0x101, }; struct ipr_trace_entry { -- 2.39.5