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[SCSI] gdth: Remove gdth_ctr_tab[] 

- Places like Initialization and Reset that Just loop on all devices can
    use the link list with the list_for_each_entry macro.
    But the io_ctrl from user mode now suffers performance-wise because
    code has to do a sequential search for the requested host number.
    I have isolated this search in a gdth_find_ha(int hanum) member
    for future enhancement if needed.

Signed-off-by Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Boaz Harrosh 2007-10-02 23:11:24 +02:00 committed by James Bottomley
parent 835cc24aff
commit 884f7fba09
1 changed files with 51 additions and 58 deletions
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103
drivers/scsi/gdth.c
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@ -290,8 +290,7 @@ static unchar gdth_irq_tab[6] = {0,10,11,12,14,0}; /* IRQ table */
#endif
static unchar gdth_polling; /* polling if TRUE */
static int gdth_ctr_count = 0; /* controller count */
static struct Scsi_Host *gdth_ctr_tab[MAXHA]; /* controller table */
static LIST_HEAD(gdth_instances);
static LIST_HEAD(gdth_instances); /* controller list */
static unchar gdth_write_through = FALSE; /* write through */
static gdth_evt_str ebuffer[MAX_EVENTS]; /* event buffer */
static int elastidx;
@ -384,6 +383,17 @@ static struct notifier_block gdth_notifier = {
};
static int notifier_disabled = 0;
static gdth_ha_str *gdth_find_ha(int hanum)
{
gdth_ha_str *ha;
list_for_each_entry(ha, &gdth_instances, list)
if (hanum == ha->hanum)
return ha;
return NULL;
}
static void gdth_delay(int milliseconds)
{
if (milliseconds == 0) {
@ -3755,7 +3765,7 @@ static void gdth_timeout(ulong data)
gdth_ha_str *ha;
ulong flags;
ha = shost_priv(gdth_ctr_tab[0]);
ha = list_first_entry(&gdth_instances, gdth_ha_str, list);
spin_lock_irqsave(&ha->smp_lock, flags);
for (act_stats=0,i=0; i<GDTH_MAXCMDS; ++i)
@ -4015,12 +4025,10 @@ static int gdth_queuecommand(struct scsi_cmnd *scp,
static int gdth_open(struct inode *inode, struct file *filep)
{
gdth_ha_str *ha;
int i;
for (i = 0; i < gdth_ctr_count; i++) {
ha = shost_priv(gdth_ctr_tab[i]);
list_for_each_entry(ha, &gdth_instances, list) {
if (!ha->sdev)
ha->sdev = scsi_get_host_dev(gdth_ctr_tab[i]);
ha->sdev = scsi_get_host_dev(ha->shost);
}
TRACE(("gdth_open()\n"));
@ -4039,10 +4047,11 @@ static int ioc_event(void __user *arg)
gdth_ha_str *ha;
ulong flags;
if (copy_from_user(&evt, arg, sizeof(gdth_ioctl_event)) ||
evt.ionode >= gdth_ctr_count)
if (copy_from_user(&evt, arg, sizeof(gdth_ioctl_event)))
return -EFAULT;
ha = gdth_find_ha(evt.ionode);
if (!ha)
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[evt.ionode]);
if (evt.erase == 0xff) {
if (evt.event.event_source == ES_TEST)
@ -4076,10 +4085,11 @@ static int ioc_lockdrv(void __user *arg)
ulong flags;
gdth_ha_str *ha;
if (copy_from_user(&ldrv, arg, sizeof(gdth_ioctl_lockdrv)) ||
ldrv.ionode >= gdth_ctr_count)
if (copy_from_user(&ldrv, arg, sizeof(gdth_ioctl_lockdrv)))
return -EFAULT;
ha = gdth_find_ha(ldrv.ionode);
if (!ha)
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[ldrv.ionode]);
for (i = 0; i < ldrv.drive_cnt && i < MAX_HDRIVES; ++i) {
j = ldrv.drives[i];
@ -4110,9 +4120,11 @@ static int ioc_resetdrv(void __user *arg, char *cmnd)
int rval;
if (copy_from_user(&res, arg, sizeof(gdth_ioctl_reset)) ||
res.ionode >= gdth_ctr_count || res.number >= MAX_HDRIVES)
res.number >= MAX_HDRIVES)
return -EFAULT;
ha = gdth_find_ha(res.ionode);
if (!ha)
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[res.ionode]);
if (!ha->hdr[res.number].present)
return 0;
@ -4142,10 +4154,11 @@ static int ioc_general(void __user *arg, char *cmnd)
gdth_ha_str *ha;
int rval;
if (copy_from_user(&gen, arg, sizeof(gdth_ioctl_general)) ||
gen.ionode >= gdth_ctr_count)
if (copy_from_user(&gen, arg, sizeof(gdth_ioctl_general)))
return -EFAULT;
ha = gdth_find_ha(gen.ionode);
if (!ha)
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[gen.ionode]);
if (gen.data_len + gen.sense_len != 0) {
if (!(buf = gdth_ioctl_alloc(ha, gen.data_len + gen.sense_len,
FALSE, &paddr)))
@ -4265,11 +4278,10 @@ static int ioc_hdrlist(void __user *arg, char *cmnd)
goto free_fail;
if (copy_from_user(rsc, arg, sizeof(gdth_ioctl_rescan)) ||
rsc->ionode >= gdth_ctr_count) {
(NULL == (ha = gdth_find_ha(rsc->ionode)))) {
rc = -EFAULT;
goto free_fail;
}
ha = shost_priv(gdth_ctr_tab[rsc->ionode]);
memset(cmd, 0, sizeof(gdth_cmd_str));
for (i = 0; i < MAX_HDRIVES; ++i) {
@ -4321,11 +4333,10 @@ static int ioc_rescan(void __user *arg, char *cmnd)
goto free_fail;
if (copy_from_user(rsc, arg, sizeof(gdth_ioctl_rescan)) ||
rsc->ionode >= gdth_ctr_count) {
(NULL == (ha = gdth_find_ha(rsc->ionode)))) {
rc = -EFAULT;
goto free_fail;
}
ha = shost_priv(gdth_ctr_tab[rsc->ionode]);
memset(cmd, 0, sizeof(gdth_cmd_str));
if (rsc->flag == 0) {
@ -4482,9 +4493,9 @@ static int gdth_ioctl(struct inode *inode, struct file *filep,
gdth_ioctl_ctrtype ctrt;
if (copy_from_user(&ctrt, argp, sizeof(gdth_ioctl_ctrtype)) ||
ctrt.ionode >= gdth_ctr_count)
(NULL == (ha = gdth_find_ha(ctrt.ionode))))
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[ctrt.ionode]);
if (ha->type == GDT_ISA || ha->type == GDT_EISA) {
ctrt.type = (unchar)((ha->stype>>20) - 0x10);
} else {
@ -4523,9 +4534,8 @@ static int gdth_ioctl(struct inode *inode, struct file *filep,
unchar i, j;
if (copy_from_user(&lchn, argp, sizeof(gdth_ioctl_lockchn)) ||
lchn.ionode >= gdth_ctr_count)
(NULL == (ha = gdth_find_ha(lchn.ionode))))
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[lchn.ionode]);
i = lchn.channel;
if (i < ha->bus_cnt) {
@ -4562,9 +4572,8 @@ static int gdth_ioctl(struct inode *inode, struct file *filep,
int rval;
if (copy_from_user(&res, argp, sizeof(gdth_ioctl_reset)) ||
res.ionode >= gdth_ctr_count)
(NULL == (ha = gdth_find_ha(res.ionode))))
return -EFAULT;
ha = shost_priv(gdth_ctr_tab[res.ionode]);
scp = kzalloc(sizeof(*scp), GFP_KERNEL);
if (!scp)
@ -4626,7 +4635,7 @@ static void gdth_flush(gdth_ha_str *ha)
/* shutdown routine */
static int gdth_halt(struct notifier_block *nb, ulong event, void *buf)
{
int hanum;
gdth_ha_str *ha;
#ifndef __alpha__
gdth_cmd_str gdtcmd;
char cmnd[MAX_COMMAND_SIZE];
@ -4641,8 +4650,7 @@ static int gdth_halt(struct notifier_block *nb, ulong event, void *buf)
notifier_disabled = 1;
printk("GDT-HA: Flushing all host drives .. ");
for (hanum = 0; hanum < gdth_ctr_count; ++hanum) {
gdth_ha_str *ha = shost_priv(gdth_ctr_tab[hanum]);
list_for_each_entry(ha, &gdth_instances, list) {
gdth_flush(ha);
#ifndef __alpha__
@ -4695,7 +4703,7 @@ static int gdth_isa_probe_one(ulong32 isa_bios)
struct Scsi_Host *shp;
gdth_ha_str *ha;
dma_addr_t scratch_dma_handle = 0;
int error, hanum, i;
int error, i;
if (!gdth_search_isa(isa_bios))
return -ENXIO;
@ -4730,10 +4738,8 @@ static int gdth_isa_probe_one(ulong32 isa_bios)
shp->unchecked_isa_dma = 1;
shp->irq = ha->irq;
shp->dma_channel = ha->drq;
hanum = gdth_ctr_count;
gdth_ctr_tab[gdth_ctr_count++] = shp;
ha->hanum = (ushort)hanum;
ha->hanum = gdth_ctr_count++;
ha->shost = shp;
ha->pccb = &ha->cmdext;
@ -4825,7 +4831,7 @@ static int gdth_eisa_probe_one(ushort eisa_slot)
struct Scsi_Host *shp;
gdth_ha_str *ha;
dma_addr_t scratch_dma_handle = 0;
int error, hanum, i;
int error, i;
if (!gdth_search_eisa(eisa_slot))
return -ENXIO;
@ -4852,10 +4858,8 @@ static int gdth_eisa_probe_one(ushort eisa_slot)
shp->unchecked_isa_dma = 0;
shp->irq = ha->irq;
shp->dma_channel = 0xff;
hanum = gdth_ctr_count;
gdth_ctr_tab[gdth_ctr_count++] = shp;
ha->hanum = (ushort)hanum;
ha->hanum = gdth_ctr_count++;
ha->shost = shp;
TRACE2(("EISA detect Bus 0: hanum %d\n", ha->hanum));
@ -4956,7 +4960,7 @@ static int gdth_pci_probe_one(gdth_pci_str *pcistr, int ctr)
struct Scsi_Host *shp;
gdth_ha_str *ha;
dma_addr_t scratch_dma_handle = 0;
int error, hanum, i;
int error, i;
shp = scsi_host_alloc(&gdth_template, sizeof(gdth_ha_str));
if (!shp)
@ -4983,10 +4987,8 @@ static int gdth_pci_probe_one(gdth_pci_str *pcistr, int ctr)
shp->unchecked_isa_dma = 0;
shp->irq = ha->irq;
shp->dma_channel = 0xff;
hanum = gdth_ctr_count;
gdth_ctr_tab[gdth_ctr_count++] = shp;
ha->hanum = (ushort)hanum;
ha->hanum = gdth_ctr_count++;
ha->shost = shp;
ha->pccb = &ha->cmdext;
@ -5147,22 +5149,16 @@ static int __init gdth_init(void)
#ifdef CONFIG_ISA
ulong32 isa_bios;
for (isa_bios = 0xc8000UL; isa_bios <= 0xd8000UL;
isa_bios += 0x8000UL) {
if (gdth_ctr_count >= MAXHA)
break;
isa_bios += 0x8000UL)
gdth_isa_probe_one(isa_bios);
}
#endif
#ifdef CONFIG_EISA
{
ushort eisa_slot;
for (eisa_slot = 0x1000; eisa_slot <= 0x8000;
eisa_slot += 0x1000) {
if (gdth_ctr_count >= MAXHA)
break;
eisa_slot += 0x1000)
gdth_eisa_probe_one(eisa_slot);
}
}
#endif
}
@ -5175,12 +5171,9 @@ static int __init gdth_init(void)
cnt = gdth_search_pci(pcistr);
printk("GDT-HA: Found %d PCI Storage RAID Controllers\n", cnt);
gdth_sort_pci(pcistr,cnt);
for (ctr = 0; ctr < cnt; ++ctr) {
if (gdth_ctr_count >= MAXHA)
break;
for (ctr = 0; ctr < cnt; ++ctr)
gdth_pci_probe_one(pcistr, ctr);
}
}
#endif /* CONFIG_PCI */
TRACE2(("gdth_detect() %d controller detected\n", gdth_ctr_count));