[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>
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 11796e6..4248b04 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -290,8 +290,7 @@
#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 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 @@
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_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 @@
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 = shost_priv(gdth_ctr_tab[evt.ionode]);
+ ha = gdth_find_ha(evt.ionode);
+ if (!ha)
+ return -EFAULT;
if (evt.erase == 0xff) {
if (evt.event.event_source == ES_TEST)
@@ -4076,11 +4085,12 @@
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 = shost_priv(gdth_ctr_tab[ldrv.ionode]);
-
+ ha = gdth_find_ha(ldrv.ionode);
+ if (!ha)
+ return -EFAULT;
+
for (i = 0; i < ldrv.drive_cnt && i < MAX_HDRIVES; ++i) {
j = ldrv.drives[i];
if (j >= MAX_HDRIVES || !ha->hdr[j].present)
@@ -4110,9 +4120,11 @@
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 = shost_priv(gdth_ctr_tab[res.ionode]);
+ ha = gdth_find_ha(res.ionode);
+ if (!ha)
+ return -EFAULT;
if (!ha->hdr[res.number].present)
return 0;
@@ -4141,11 +4153,12 @@
ulong64 paddr;
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 = shost_priv(gdth_ctr_tab[gen.ionode]);
+ ha = gdth_find_ha(gen.ionode);
+ if (!ha)
+ return -EFAULT;
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 @@
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 @@
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 @@
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 {
@@ -4523,10 +4534,9 @@
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) {
if (lchn.lock) {
@@ -4562,9 +4572,8 @@
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 @@
/* 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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;
@@ -5147,21 +5149,15 @@
#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
}
@@ -5175,11 +5171,8 @@
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 */