diff options
| -rw-r--r-- | Documentation/blockdev/cciss.txt | 10 | ||||
| -rw-r--r-- | drivers/block/cciss.c | 56 | ||||
| -rw-r--r-- | drivers/block/cciss.h | 1 |
3 files changed, 56 insertions, 11 deletions
diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt index c00c6a5ab21f..71464e09ec18 100644 --- a/Documentation/blockdev/cciss.txt +++ b/Documentation/blockdev/cciss.txt @@ -78,6 +78,16 @@ The device naming scheme is: /dev/cciss/c1d1p2 Controller 1, disk 1, partition 2 /dev/cciss/c1d1p3 Controller 1, disk 1, partition 3 +CCISS simple mode support +------------------------- + +The "cciss_simple_mode=1" boot parameter may be used to prevent the driver +from putting the controller into "performant" mode. The difference is that +with simple mode, each command completion requires an interrupt, while with +"performant mode" (the default, and ordinarily better performing) it is +possible to have multiple command completions indicated by a single +interrupt. + SCSI tape drive and medium changer support ------------------------------------------ diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 8f4ef656a1af..61f0b5b6a415 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -68,6 +68,10 @@ static int cciss_tape_cmds = 6; module_param(cciss_tape_cmds, int, 0644); MODULE_PARM_DESC(cciss_tape_cmds, "number of commands to allocate for tape devices (default: 6)"); +static int cciss_simple_mode; +module_param(cciss_simple_mode, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(cciss_simple_mode, + "Use 'simple mode' rather than 'performant mode'"); static DEFINE_MUTEX(cciss_mutex); static struct proc_dir_entry *proc_cciss; @@ -176,6 +180,7 @@ static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol, unsigned int block_size, InquiryData_struct *inq_buff, drive_info_struct *drv); static void __devinit cciss_interrupt_mode(ctlr_info_t *); +static int __devinit cciss_enter_simple_mode(struct ctlr_info *h); static void start_io(ctlr_info_t *h); static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size, __u8 page_code, unsigned char scsi3addr[], @@ -388,7 +393,7 @@ static void cciss_seq_show_header(struct seq_file *seq) h->product_name, (unsigned long)h->board_id, h->firm_ver[0], h->firm_ver[1], h->firm_ver[2], - h->firm_ver[3], (unsigned int)h->intr[PERF_MODE_INT], + h->firm_ver[3], (unsigned int)h->intr[h->intr_mode], h->num_luns, h->Qdepth, h->commands_outstanding, h->maxQsinceinit, h->max_outstanding, h->maxSG); @@ -3984,6 +3989,9 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h) { __u32 trans_support; + if (cciss_simple_mode) + return; + dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n"); /* Attempt to put controller into performant mode if supported */ /* Does board support performant mode? */ @@ -4081,7 +4089,7 @@ static void __devinit cciss_interrupt_mode(ctlr_info_t *h) default_int_mode: #endif /* CONFIG_PCI_MSI */ /* if we get here we're going to use the default interrupt mode */ - h->intr[PERF_MODE_INT] = h->pdev->irq; + h->intr[h->intr_mode] = h->pdev->irq; return; } @@ -4341,6 +4349,9 @@ static int __devinit cciss_pci_init(ctlr_info_t *h) } cciss_enable_scsi_prefetch(h); cciss_p600_dma_prefetch_quirk(h); + err = cciss_enter_simple_mode(h); + if (err) + goto err_out_free_res; cciss_put_controller_into_performant_mode(h); return 0; @@ -4843,20 +4854,20 @@ static int cciss_request_irq(ctlr_info_t *h, irqreturn_t (*intxhandler)(int, void *)) { if (h->msix_vector || h->msi_vector) { - if (!request_irq(h->intr[PERF_MODE_INT], msixhandler, + if (!request_irq(h->intr[h->intr_mode], msixhandler, IRQF_DISABLED, h->devname, h)) return 0; dev_err(&h->pdev->dev, "Unable to get msi irq %d" - " for %s\n", h->intr[PERF_MODE_INT], + " for %s\n", h->intr[h->intr_mode], h->devname); return -1; } - if (!request_irq(h->intr[PERF_MODE_INT], intxhandler, + if (!request_irq(h->intr[h->intr_mode], intxhandler, IRQF_DISABLED, h->devname, h)) return 0; dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n", - h->intr[PERF_MODE_INT], h->devname); + h->intr[h->intr_mode], h->devname); return -1; } @@ -4887,7 +4898,7 @@ static void cciss_undo_allocations_after_kdump_soft_reset(ctlr_info_t *h) { int ctlr = h->ctlr; - free_irq(h->intr[PERF_MODE_INT], h); + free_irq(h->intr[h->intr_mode], h); #ifdef CONFIG_PCI_MSI if (h->msix_vector) pci_disable_msix(h->pdev); @@ -4953,6 +4964,7 @@ reinit_after_soft_reset: h = hba[i]; h->pdev = pdev; h->busy_initializing = 1; + h->intr_mode = cciss_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT; INIT_LIST_HEAD(&h->cmpQ); INIT_LIST_HEAD(&h->reqQ); mutex_init(&h->busy_shutting_down); @@ -5009,7 +5021,7 @@ reinit_after_soft_reset: dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n", h->devname, pdev->device, pci_name(pdev), - h->intr[PERF_MODE_INT], dac ? "" : " not"); + h->intr[h->intr_mode], dac ? "" : " not"); if (cciss_allocate_cmd_pool(h)) goto clean4; @@ -5056,7 +5068,7 @@ reinit_after_soft_reset: spin_lock_irqsave(&h->lock, flags); h->access.set_intr_mask(h, CCISS_INTR_OFF); spin_unlock_irqrestore(&h->lock, flags); - free_irq(h->intr[PERF_MODE_INT], h); + free_irq(h->intr[h->intr_mode], h); rc = cciss_request_irq(h, cciss_msix_discard_completions, cciss_intx_discard_completions); if (rc) { @@ -5133,7 +5145,7 @@ clean4: cciss_free_cmd_pool(h); cciss_free_scatterlists(h); cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds); - free_irq(h->intr[PERF_MODE_INT], h); + free_irq(h->intr[h->intr_mode], h); clean2: unregister_blkdev(h->major, h->devname); clean1: @@ -5172,9 +5184,31 @@ static void cciss_shutdown(struct pci_dev *pdev) if (return_code != IO_OK) dev_warn(&h->pdev->dev, "Error flushing cache\n"); h->access.set_intr_mask(h, CCISS_INTR_OFF); - free_irq(h->intr[PERF_MODE_INT], h); + free_irq(h->intr[h->intr_mode], h); } +static int __devinit cciss_enter_simple_mode(struct ctlr_info *h) +{ + u32 trans_support; + + trans_support = readl(&(h->cfgtable->TransportSupport)); + if (!(trans_support & SIMPLE_MODE)) + return -ENOTSUPP; + + h->max_commands = readl(&(h->cfgtable->CmdsOutMax)); + writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest)); + writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL); + cciss_wait_for_mode_change_ack(h); + print_cfg_table(h); + if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) { + dev_warn(&h->pdev->dev, "unable to get board into simple mode\n"); + return -ENODEV; + } + h->transMethod = CFGTBL_Trans_Simple; + return 0; +} + + static void __devexit cciss_remove_one(struct pci_dev *pdev) { ctlr_info_t *h; diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h index c049548e68b7..7fda30e4a241 100644 --- a/drivers/block/cciss.h +++ b/drivers/block/cciss.h @@ -92,6 +92,7 @@ struct ctlr_info unsigned int intr[4]; unsigned int msix_vector; unsigned int msi_vector; + int intr_mode; int cciss_max_sectors; BYTE cciss_read; BYTE cciss_write; |