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[SCSI] aacraid: add parameter to control FUA and SYNCHRONIZE_CACHE policy 

aacraid.cache parameter, Disable Queue Flush commands:
        bit 0 - Disable FUA in WRITE SCSI commands
        bit 1 - Disable SYNCHRONIZE_CACHE SCSI command
        bit 2 - Disable only if Battery not protecting adapter supplied Cache

e.g.: aacraid.cache=7 will disable the FUA and SYNCHRONIZE_CACHE
commands if the adapter has reported that it's cache is battery backed
up.

This parameter permits experimentation with tradeoffs between
performance and caching policy.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Salyzyn, Mark 2008-01-08 12:01:07 -08:00 committed by James Bottomley
parent 9b161a4d3e
commit 95e852e1ef
3 changed files with 30 additions and 12 deletions
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36
drivers/scsi/aacraid/aachba.c
View File

@ -144,6 +144,7 @@ static char *aac_get_status_string(u32 status);
*/
static int nondasd = -1;
static int aac_cache = 0;
static int dacmode = -1;
int aac_commit = -1;
@ -152,6 +153,8 @@ int aif_timeout = 120;
module_param(nondasd, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(nondasd, "Control scanning of hba for nondasd devices. 0=off, 1=on");
module_param_named(cache, aac_cache, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(cache, "Disable Queue Flush commands:\n\tbit 0 - Disable FUA in WRITE SCSI commands\n\tbit 1 - Disable SYNCHRONIZE_CACHE SCSI command\n\tbit 2 - Disable only if Battery not protecting Cache");
module_param(dacmode, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(dacmode, "Control whether dma addressing is using 64 bit DAC. 0=off, 1=on");
module_param_named(commit, aac_commit, int, S_IRUGO|S_IWUSR);
@ -1013,7 +1016,8 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
writecmd->block[1] = cpu_to_le32((u32)((lba&0xffffffff00000000LL)>>32));
writecmd->count = cpu_to_le32(count<<9);
writecmd->cid = cpu_to_le16(scmd_id(cmd));
writecmd->flags = fua ?
writecmd->flags = (fua && ((aac_cache & 5) != 1) &&
(((aac_cache & 5) != 5) || !fib->dev->cache_protected)) ?
cpu_to_le16(IO_TYPE_WRITE|IO_SUREWRITE) :
cpu_to_le16(IO_TYPE_WRITE);
writecmd->bpTotal = 0;
@ -1325,11 +1329,11 @@ int aac_get_adapter_info(struct aac_dev* dev)
}
}
dev->cache_protected = 0;
dev->nondasd_support = 0;
dev->raid_scsi_mode = 0;
if(dev->adapter_info.options & AAC_OPT_NONDASD){
if(dev->adapter_info.options & AAC_OPT_NONDASD)
dev->nondasd_support = 1;
}
/*
* If the firmware supports ROMB RAID/SCSI mode and we are currently
@ -1351,10 +1355,9 @@ int aac_get_adapter_info(struct aac_dev* dev)
printk(KERN_INFO "%s%d: ROMB RAID/SCSI mode enabled\n",
dev->name, dev->id);
if(nondasd != -1) {
if (nondasd != -1)
dev->nondasd_support = (nondasd!=0);
}
if(dev->nondasd_support != 0){
if(dev->nondasd_support != 0) {
printk(KERN_INFO "%s%d: Non-DASD support enabled.\n",dev->name, dev->id);
}
@ -2106,7 +2109,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
mode_buf[2] = 0; /* Device-specific param,
bit 8: 0/1 = write enabled/protected
bit 4: 0/1 = FUA enabled */
if (dev->raw_io_interface)
if (dev->raw_io_interface && ((aac_cache & 5) != 1))
mode_buf[2] = 0x10;
mode_buf[3] = 0; /* Block descriptor length */
if (((scsicmd->cmnd[2] & 0x3f) == 8) ||
@ -2114,7 +2117,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
mode_buf[0] = 6;
mode_buf[4] = 8;
mode_buf[5] = 1;
mode_buf[6] = 0x04; /* WCE */
mode_buf[6] = ((aac_cache & 6) == 2)
? 0 : 0x04; /* WCE */
mode_buf_length = 7;
if (mode_buf_length > scsicmd->cmnd[4])
mode_buf_length = scsicmd->cmnd[4];
@ -2137,7 +2141,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
mode_buf[3] = 0; /* Device-specific param,
bit 8: 0/1 = write enabled/protected
bit 4: 0/1 = FUA enabled */
if (dev->raw_io_interface)
if (dev->raw_io_interface && ((aac_cache & 5) != 1))
mode_buf[3] = 0x10;
mode_buf[4] = 0; /* reserved */
mode_buf[5] = 0; /* reserved */
@ -2148,7 +2152,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
mode_buf[1] = 9;
mode_buf[8] = 8;
mode_buf[9] = 1;
mode_buf[10] = 0x04; /* WCE */
mode_buf[10] = ((aac_cache & 6) == 2)
? 0 : 0x04; /* WCE */
mode_buf_length = 11;
if (mode_buf_length > scsicmd->cmnd[8])
mode_buf_length = scsicmd->cmnd[8];
@ -2224,9 +2229,16 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
return aac_write(scsicmd);
case SYNCHRONIZE_CACHE:
if (((aac_cache & 6) == 6) && dev->cache_protected) {
scsicmd->result = DID_OK << 16 |
COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;
scsicmd->scsi_done(scsicmd);
return 0;
}
/* Issue FIB to tell Firmware to flush it's cache */
return aac_synchronize(scsicmd);
if ((aac_cache & 6) != 2)
return aac_synchronize(scsicmd);
/* FALLTHRU */
default:
/*
* Unhandled commands

2
drivers/scsi/aacraid/aacraid.h
View File

@ -1016,6 +1016,7 @@ struct aac_dev
* lets break them out so we don't have to do an AND to check them
*/
u8 nondasd_support;
u8 cache_protected;
u8 dac_support;
u8 raid_scsi_mode;
u8 comm_interface;
@ -1770,6 +1771,7 @@ extern struct aac_common aac_config;
#define AifEnConfigChange 3 /* Adapter configuration change */
#define AifEnContainerChange 4 /* Container configuration change */
#define AifEnDeviceFailure 5 /* SCSI device failed */
#define AifEnBatteryEvent 14 /* Change in Battery State */
#define AifEnAddContainer 15 /* A new array was created */
#define AifEnDeleteContainer 16 /* A container was deleted */
#define AifEnExpEvent 23 /* Firmware Event Log */

4
drivers/scsi/aacraid/commsup.c
View File

@ -849,6 +849,10 @@ static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
case AifCmdEventNotify:
switch (le32_to_cpu(((__le32 *)aifcmd->data)[0])) {
case AifEnBatteryEvent:
dev->cache_protected =
(((__le32 *)aifcmd->data)[1] == cpu_to_le32(3));
break;
/*
* Add an Array.
*/