Commit fb86a35b authored by Mike Miller's avatar Mike Miller Committed by Linus Torvalds
Browse files

[PATCH] cciss: adds MSI and MSI-X support

This creates a new function, cciss_interrupt_mode called from
cciss_pci_init.  This function determines what type of interrupt vector to
use, i.e., MSI, MSI-X, or IO-APIC.

One noticeable difference is changing the interrupt field of the controller
struct to an array of 4 unsigned ints.  The Smart Array HW is capable of
generating 4 distinct interrupts depending on the transport method in use
during operation.  These are:

#define DOORBELL_INT 0
Used to notify the contoller of configuration updates. We only use
this feature when in polling mode.

#define PERF_MODE_INT 0
Used when the controller is in Performant Mode.

Used when the controller is in Simple Mode (current Linux implementation).

#define MEMQ_INT_MODE 3
Not used.

When using IO-APIC interrupts these 4 lines are OR'ed together so when any
one fires an interrupt an is generated.  In MSI or MSI-X mode this hardware
OR'ing is ignored.  We must register for our interrupt depending on what
mode the controller is running.  For Linux we use SIMPLE_MODE_INT
exclusively at this time.  Please consider this for inclusion.

Signed-off-by: default avatarMike Miller <>
Cc: Jens Axboe <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent d09cf7d7
* Disk Array driver for HP SA 5xxx and 6xxx Controllers
* Copyright 2000, 2005 Hewlett-Packard Development Company, L.P.
* Copyright 2000, 2006 Hewlett-Packard Development Company, L.P.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
......@@ -47,12 +47,12 @@
#include <linux/completion.h>
#define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
#define DRIVER_NAME "HP CISS Driver (v 2.6.8)"
#define DRIVER_NAME "HP CISS Driver (v 2.6.10)"
/* Embedded module documentation macros - see modules.h */
MODULE_AUTHOR("Hewlett-Packard Company");
MODULE_DESCRIPTION("Driver for HP Controller SA5xxx SA6xxx version 2.6.8");
MODULE_DESCRIPTION("Driver for HP Controller SA5xxx SA6xxx version 2.6.10");
MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
" SA6i P600 P800 P400 P400i E200 E200i");
......@@ -167,7 +167,7 @@ static void cciss_geometry_inquiry(int ctlr, int logvol,
unsigned int block_size, InquiryData_struct *inq_buff,
drive_info_struct *drv);
static void cciss_getgeometry(int cntl_num);
static void __devinit cciss_interrupt_mode(ctlr_info_t *, struct pci_dev *, __u32);
static void start_io( ctlr_info_t *h);
static int sendcmd( __u8 cmd, int ctlr, void *buff, size_t size,
unsigned int use_unit_num, unsigned int log_unit, __u8 page_code,
......@@ -284,7 +284,7 @@ static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
(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,
(unsigned int)h->intr[SIMPLE_MODE_INT],
h->Qdepth, h->commands_outstanding,
h->maxQsinceinit, h->max_outstanding, h->maxSG);
......@@ -2662,6 +2662,60 @@ static int find_PCI_BAR_index(struct pci_dev *pdev,
return -1;
/* If MSI/MSI-X is supported by the kernel we will try to enable it on
* controllers that are capable. If not, we use IO-APIC mode.
static void __devinit cciss_interrupt_mode(ctlr_info_t *c, struct pci_dev *pdev, __u32 board_id)
int err;
struct msix_entry cciss_msix_entries[4] = {{0,0}, {0,1},
{0,2}, {0,3}};
/* Some boards advertise MSI but don't really support it */
if ((board_id == 0x40700E11) ||
(board_id == 0x40800E11) ||
(board_id == 0x40820E11) ||
(board_id == 0x40830E11))
goto default_int_mode;
if (pci_find_capability(pdev, PCI_CAP_ID_MSIX)) {
err = pci_enable_msix(pdev, cciss_msix_entries, 4);
if (!err) {
c->intr[0] = cciss_msix_entries[0].vector;
c->intr[1] = cciss_msix_entries[1].vector;
c->intr[2] = cciss_msix_entries[2].vector;
c->intr[3] = cciss_msix_entries[3].vector;
c->msix_vector = 1;
if (err > 0) {
printk(KERN_WARNING "cciss: only %d MSI-X vectors "
"available\n", err);
} else {
printk(KERN_WARNING "cciss: MSI-X init failed %d\n",
if (pci_find_capability(pdev, PCI_CAP_ID_MSI)) {
if (!pci_enable_msi(pdev)) {
c->intr[SIMPLE_MODE_INT] = pdev->irq;
c->msi_vector = 1;
} else {
printk(KERN_WARNING "cciss: MSI init failed\n");
c->intr[SIMPLE_MODE_INT] = pdev->irq;
#endif /* CONFIG_PCI_MSI */
/* if we get here we're going to use the default interrupt mode */
c->intr[SIMPLE_MODE_INT] = pdev->irq;
static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
ushort subsystem_vendor_id, subsystem_device_id, command;
......@@ -2722,7 +2776,10 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
printk("board_id = %x\n", board_id);
#endif /* CCISS_DEBUG */
c->intr = pdev->irq;
/* If the kernel supports MSI/MSI-X we will try to enable that functionality,
* else we use the IO-APIC interrupt assigned to us by system ROM.
cciss_interrupt_mode(c, pdev, board_id);
* Memory base addr is first addr , the second points to the config
......@@ -3076,11 +3133,11 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
/* make sure the board interrupts are off */
hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_OFF);
if( request_irq(hba[i]->intr, do_cciss_intr,
if( request_irq(hba[i]->intr[SIMPLE_MODE_INT], do_cciss_intr,
hba[i]->devname, hba[i])) {
printk(KERN_ERR "cciss: Unable to get irq %d for %s\n",
hba[i]->intr, hba[i]->devname);
hba[i]->intr[SIMPLE_MODE_INT], hba[i]->devname);
goto clean2;
hba[i]->cmd_pool_bits = kmalloc(((NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG)*sizeof(unsigned long), GFP_KERNEL);
......@@ -3186,7 +3243,7 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
NR_CMDS * sizeof( ErrorInfo_struct),
free_irq(hba[i]->intr, hba[i]);
free_irq(hba[i]->intr[SIMPLE_MODE_INT], hba[i]);
unregister_blkdev(hba[i]->major, hba[i]->devname);
......@@ -3227,7 +3284,15 @@ static void __devexit cciss_remove_one (struct pci_dev *pdev)
printk(KERN_WARNING "Error Flushing cache on controller %d\n",
free_irq(hba[i]->intr, hba[i]);
free_irq(hba[i]->intr[2], hba[i]);
if (hba[i]->msix_vector)
else if (hba[i]->msi_vector)
#endif /* CONFIG_PCI_MSI */
pci_set_drvdata(pdev, NULL);
cciss_unregister_scsi(i); /* unhook from SCSI subsystem */
......@@ -65,7 +65,6 @@ struct ctlr_info
unsigned long io_mem_addr;
unsigned long io_mem_length;
CfgTable_struct __iomem *cfgtable;
unsigned int intr;
int interrupts_enabled;
int major;
int max_commands;
......@@ -74,6 +73,13 @@ struct ctlr_info
int num_luns;
int highest_lun;
int usage_count; /* number of opens all all minor devices */
# define DOORBELL_INT 0
# define PERF_MODE_INT 1
# define SIMPLE_MODE_INT 2
# define MEMQ_MODE_INT 3
unsigned int intr[4];
unsigned int msix_vector;
unsigned int msi_vector;
// information about each logical volume
drive_info_struct drv[CISS_MAX_LUN];
......@@ -714,7 +714,7 @@ cciss_scsi_detect(int ctlr)
((struct cciss_scsi_adapter_data_t *)
hba[ctlr]->scsi_ctlr)->scsi_host = (void *) sh;
sh->hostdata[0] = (unsigned long) hba[ctlr];
sh->irq = hba[ctlr]->intr;
sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT];
sh->unique_id = sh->irq;
error = scsi_add_host(sh, &hba[ctlr]->pdev->dev);
if (error)
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