[PATCH 11/16] gdth: switch to modern scsi host registration

Boaz Harrosh
2007-09-30T20:10:50Z

- Use scsi_add_host and friends and track instances ourselves. And
generally modernize the driver's structure.

- TODO: Next we can remove the controller table
- TODO: Fix use of deprecated pci_find_device()

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
drivers/scsi/gdth.c | 314 +++++++++++++++++++++++++--------------------------
drivers/scsi/gdth.h | 1 +
2 files changed, 153 insertions(+), 162 deletions(-)

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index b08bea3..986bfaf 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -119,6 +119,7 @@
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/dma-mapping.h>
+#include <linux/list.h>

#ifdef GDTH_RTC
#include <linux/mc146818rtc.h>
@@ -192,15 +193,6 @@ static void gdth_flush(gdth_ha_str *ha);
static int gdth_halt(struct notifier_block *nb, ulong event, void *buf);
static int gdth_queuecommand(Scsi_Cmnd *scp,void (*done)(Scsi_Cmnd *));
static void gdth_scsi_done(struct scsi_cmnd *scp);
-#ifdef CONFIG_ISA
-static int gdth_isa_probe_one(struct scsi_host_template *, ulong32);
-#endif
-#ifdef CONFIG_EISA
-static int gdth_eisa_probe_one(struct scsi_host_template *, ushort);
-#endif
-#ifdef CONFIG_PCI
-static int gdth_pci_probe_one(struct scsi_host_template *, gdth_pci_str *, int);
-#endif

#ifdef DEBUG_GDTH
static unchar DebugState = DEBUG_GDTH;
@@ -304,8 +296,8 @@ static unchar gdth_polling; /* polling if TRUE */
static unchar gdth_from_wait = FALSE; /* gdth_wait() */
static int wait_index,wait_hanum; /* gdth_wait() */
static int gdth_ctr_count = 0; /* controller count */
-static int gdth_ctr_released = 0; /* gdth_release() */
static struct Scsi_Host *gdth_ctr_tab[MAXHA]; /* controller table */
+static LIST_HEAD(gdth_instances);
static unchar gdth_write_through = FALSE; /* write through */
static gdth_evt_str ebuffer[MAX_EVENTS]; /* event buffer */
static int elastidx;
@@ -3869,143 +3861,6 @@ int __init option_setup(char *str)
return 1;
}

-static int __init gdth_detect(struct scsi_host_template *shtp)
-{
- gdth_pci_str pcistr[MAXHA];
- ulong32 isa_bios;
- ushort eisa_slot;
- int cnt,ctr;
- unchar b;
-
-
-#ifdef DEBUG_GDTH
- printk("GDT: This driver contains debugging information !! Trace level = %d\n",
- DebugState);
- printk(" Destination of debugging information: ");
-#ifdef __SERIAL__
-#ifdef __COM2__
- printk("Serial port COM2\n");
-#else
- printk("Serial port COM1\n");
-#endif
-#else
- printk("Console\n");
-#endif
- gdth_delay(3000);
-#endif
-
- TRACE(("gdth_detect()\n"));
-
- if (disable) {
- printk("GDT-HA: Controller driver disabled from command line !\n");
- return 0;
- }
-
- printk("GDT-HA: Storage RAID Controller Driver. Version: %s\n",GDTH_VERSION_STR);
- /* initializations */
- gdth_polling = TRUE; b = 0;
- gdth_clear_events();
-
- /* As default we do not probe for EISA or ISA controllers */
- if (probe_eisa_isa) {
- /* scanning for controllers, at first: ISA controller */
-#ifdef CONFIG_ISA
- for (isa_bios = 0xc8000UL; isa_bios <= 0xd8000UL;
- isa_bios += 0x8000UL) {
- if (gdth_ctr_count >= MAXHA)
- break;
- gdth_isa_probe_one(shtp, isa_bios);
- }
-#endif
-#ifdef CONFIG_EISA
- for (eisa_slot = 0x1000; eisa_slot <= 0x8000; eisa_slot += 0x1000) {
- if (gdth_ctr_count >= MAXHA)
- break;
- gdth_eisa_probe_one(shtp, eisa_slot);
- }
- }
-#endif
-
-#ifdef CONFIG_PCI
- /* scanning for PCI controllers */
- 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;
- gdth_pci_probe_one(shtp, pcistr, ctr);
- }
-#endif
-
- TRACE2(("gdth_detect() %d controller detected\n",gdth_ctr_count));
- if (gdth_ctr_count > 0) {
-#ifdef GDTH_STATISTICS
- TRACE2(("gdth_detect(): Initializing timer !\n"));
- init_timer(&gdth_timer);
- gdth_timer.expires = jiffies + HZ;
- gdth_timer.data = 0L;
- gdth_timer.function = gdth_timeout;
- add_timer(&gdth_timer);
-#endif
- major = register_chrdev(0,"gdth",&gdth_fops);
- notifier_disabled = 0;
- register_reboot_notifier(&gdth_notifier);
- }
- gdth_polling = FALSE;
- return gdth_ctr_count;
-}
-
-static int gdth_release(struct Scsi_Host *shp)
-{
- gdth_ha_str *ha = shost_priv(shp);
-
- TRACE2(("gdth_release()\n"));
- if (ha->sdev) {
- scsi_free_host_dev(ha->sdev);
- ha->sdev = NULL;
- }
- gdth_flush(ha);
-
- if (shp->irq) {
- free_irq(shp->irq,ha);
- }
-#ifdef CONFIG_ISA
- if (shp->dma_channel != 0xff) {
- free_dma(shp->dma_channel);
- }
-#endif
-#ifdef INT_COAL
- if (ha->coal_stat)
- pci_free_consistent(ha->pdev, sizeof(gdth_coal_status) *
- MAXOFFSETS, ha->coal_stat, ha->coal_stat_phys);
-#endif
- if (ha->pscratch)
- pci_free_consistent(ha->pdev, GDTH_SCRATCH,
- ha->pscratch, ha->scratch_phys);
- if (ha->pmsg)
- pci_free_consistent(ha->pdev, sizeof(gdth_msg_str),
- ha->pmsg, ha->msg_phys);
- if (ha->ccb_phys)
- pci_unmap_single(ha->pdev,ha->ccb_phys,
- sizeof(gdth_cmd_str),PCI_DMA_BIDIRECTIONAL);
- gdth_ctr_released++;
- TRACE2(("gdth_release(): HA %d of %d\n",
- gdth_ctr_released, gdth_ctr_count));
-
- if (gdth_ctr_released == gdth_ctr_count) {
-#ifdef GDTH_STATISTICS
- del_timer(&gdth_timer);
-#endif
- unregister_chrdev(major,"gdth");
- unregister_reboot_notifier(&gdth_notifier);
- }
-
- scsi_unregister(shp);
- return 0;
-}
-
-
static const char *gdth_ctr_name(gdth_ha_str *ha)
{
TRACE2(("gdth_ctr_name()\n"));
@@ -4813,10 +4668,8 @@ static int gdth_slave_configure(struct scsi_device *sdev)
return 0;
}

-static struct scsi_host_template driver_template = {
+static struct scsi_host_template gdth_template = {
.name = "GDT SCSI Disk Array Controller",
- .detect = gdth_detect,
- .release = gdth_release,
.info = gdth_info,
.queuecommand = gdth_queuecommand,
.eh_bus_reset_handler = gdth_eh_bus_reset,
@@ -4833,7 +4686,7 @@ static struct scsi_host_template driver_template = {
};

#ifdef CONFIG_ISA
-static int gdth_isa_probe_one(struct scsi_host_template *shtp, ulong32 isa_bios)
+static int gdth_isa_probe_one(ulong32 isa_bios)
{
struct Scsi_Host *shp;
gdth_ha_str *ha;
@@ -4843,7 +4696,7 @@ static int gdth_isa_probe_one(struct scsi_host_template *shtp, ulong32 isa_bios)
if (!gdth_search_isa(isa_bios))
return -ENXIO;

- shp = scsi_register(shtp, sizeof(gdth_ha_str));
+ shp = scsi_host_alloc(&gdth_template, sizeof(gdth_ha_str));
if (!shp)
return -ENOMEM;
ha = shost_priv(shp);
@@ -4935,6 +4788,10 @@ static int gdth_isa_probe_one(struct scsi_host_template *shtp, ulong32 isa_bios)
spin_lock_init(&ha->smp_lock);
gdth_enable_int(ha);

+ error = scsi_add_host(shp, NULL);
+ if (error)
+ goto out_free_coal_stat;
+ list_add_tail(&ha->list, &gdth_instances);
return 0;

out_free_coal_stat:
@@ -4953,14 +4810,13 @@ static int gdth_isa_probe_one(struct scsi_host_template *shtp, ulong32 isa_bios)
out_free_irq:
free_irq(ha->irq, ha);
out_host_put:
- scsi_unregister(shp);
+ scsi_host_put(shp);
return error;
}
#endif /* CONFIG_ISA */

#ifdef CONFIG_EISA
-static int gdth_eisa_probe_one(struct scsi_host_template *shtp,
- ushort eisa_slot)
+static int gdth_eisa_probe_one(ushort eisa_slot)
{
struct Scsi_Host *shp;
gdth_ha_str *ha;
@@ -4970,7 +4826,7 @@ static int gdth_eisa_probe_one(struct scsi_host_template *shtp,
if (!gdth_search_eisa(eisa_slot))
return -ENXIO;

- shp = scsi_register(shtp,sizeof(gdth_ha_str));
+ shp = scsi_host_alloc(&gdth_template, sizeof(gdth_ha_str));
if (!shp)
return -ENOMEM;
ha = shost_priv(shp);
@@ -5060,6 +4916,11 @@ static int gdth_eisa_probe_one(struct scsi_host_template *shtp,

spin_lock_init(&ha->smp_lock);
gdth_enable_int(ha);
+
+ error = scsi_add_host(shp, NULL);
+ if (error)
+ goto out_free_coal_stat;
+ list_add_tail(&ha->list, &gdth_instances);
return 0;

out_free_ccb_phys:
@@ -5080,21 +4941,20 @@ static int gdth_eisa_probe_one(struct scsi_host_template *shtp,
free_irq(ha->irq, ha);
gdth_ctr_count--;
out_host_put:
- scsi_unregister(shp);
+ scsi_host_put(shp);
return error;
}
#endif /* CONFIG_EISA */

#ifdef CONFIG_PCI
-static int gdth_pci_probe_one(struct scsi_host_template *shtp,
- gdth_pci_str *pcistr, int ctr)
+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;

- shp = scsi_register(shtp,sizeof(gdth_ha_str));
+ shp = scsi_host_alloc(&gdth_template, sizeof(gdth_ha_str));
if (!shp)
return -ENOMEM;
ha = shost_priv(shp);
@@ -5195,6 +5055,11 @@ static int gdth_pci_probe_one(struct scsi_host_template *shtp,

spin_lock_init(&ha->smp_lock);
gdth_enable_int(ha);
+
+ error = scsi_add_host(shp, &pcistr[ctr].pdev->dev);
+ if (error)
+ goto out_free_coal_stat;
+ list_add_tail(&ha->list, &gdth_instances);
return 0;

out_free_coal_stat:
@@ -5212,12 +5077,137 @@ static int gdth_pci_probe_one(struct scsi_host_template *shtp,
free_irq(ha->irq, ha);
gdth_ctr_count--;
out_host_put:
- scsi_unregister(shp);
+ scsi_host_put(shp);
return error;
}
#endif /* CONFIG_PCI */

-#include "scsi_module.c"
+static void gdth_remove_one(gdth_ha_str *ha)
+{
+ struct Scsi_Host *shp = ha->shost;
+
+ TRACE2(("gdth_remove_one()\n"));
+
+ scsi_remove_host(shp);
+
+ if (ha->sdev) {
+ scsi_free_host_dev(ha->sdev);
+ ha->sdev = NULL;
+ }
+
+ gdth_flush(ha);
+
+ if (shp->irq)
+ free_irq(shp->irq,ha);
+
+#ifdef CONFIG_ISA
+ if (shp->dma_channel != 0xff)
+ free_dma(shp->dma_channel);
+#endif
+#ifdef INT_COAL
+ if (ha->coal_stat)
+ pci_free_consistent(ha->pdev, sizeof(gdth_coal_status) *
+ MAXOFFSETS, ha->coal_stat, ha->coal_stat_phys);
+#endif
+ if (ha->pscratch)
+ pci_free_consistent(ha->pdev, GDTH_SCRATCH,
+ ha->pscratch, ha->scratch_phys);
+ if (ha->pmsg)
+ pci_free_consistent(ha->pdev, sizeof(gdth_msg_str),
+ ha->pmsg, ha->msg_phys);
+ if (ha->ccb_phys)
+ pci_unmap_single(ha->pdev,ha->ccb_phys,
+ sizeof(gdth_cmd_str),PCI_DMA_BIDIRECTIONAL);
+
+ scsi_host_put(shp);
+}
+
+static int __init gdth_init(void)
+{
+ gdth_pci_str pcistr[MAXHA];
+ ulong32 isa_bios;
+ ushort eisa_slot;
+ int cnt, ctr;
+
+ if (disable) {
+ printk("GDT-HA: Controller driver disabled from"
+ " command line !\n");
+ return 0;
+ }
+
+ printk("GDT-HA: Storage RAID Controller Driver. Version: %s\n",
+ GDTH_VERSION_STR);
+
+ /* initializations */
+ gdth_polling = TRUE;
+ gdth_clear_events();
+
+ /* As default we do not probe for EISA or ISA controllers */
+ if (probe_eisa_isa) {
+ /* scanning for controllers, at first: ISA controller */
+#ifdef CONFIG_ISA
+ for (isa_bios = 0xc8000UL; isa_bios <= 0xd8000UL;
+ isa_bios += 0x8000UL) {
+ if (gdth_ctr_count >= MAXHA)
+ break;
+ gdth_isa_probe_one(isa_bios);
+ }
+#endif
+#ifdef CONFIG_EISA
+ for (eisa_slot = 0x1000; eisa_slot <= 0x8000; eisa_slot += 0x1000) {
+ if (gdth_ctr_count >= MAXHA)
+ break;
+ gdth_eisa_probe_one(eisa_slot);
+ }
+ }
+#endif
+#ifdef CONFIG_PCI
+ /* scanning for PCI controllers */
+ 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;
+ gdth_pci_probe_one(pcistr, ctr);
+ }
+#endif
+
+ TRACE2(("gdth_detect() %d controller detected\n",gdth_ctr_count));
+#ifdef GDTH_STATISTICS
+ TRACE2(("gdth_detect(): Initializing timer !\n"));
+ init_timer(&gdth_timer);
+ gdth_timer.expires = jiffies + HZ;
+ gdth_timer.data = 0L;
+ gdth_timer.function = gdth_timeout;
+ add_timer(&gdth_timer);
+#endif
+ major = register_chrdev(0,"gdth",&gdth_fops);
+ notifier_disabled = 0;
+ register_reboot_notifier(&gdth_notifier);
+
+
+ gdth_polling = FALSE;
+ return 0;
+}
+
+static void __exit gdth_exit(void)
+{
+ gdth_ha_str *ha;
+
+ list_for_each_entry(ha, &gdth_instances, list)
+ gdth_remove_one(ha);
+
+#ifdef GDTH_STATISTICS
+ del_timer(&gdth_timer);
+#endif
+ unregister_chrdev(major,"gdth");
+ unregister_reboot_notifier(&gdth_notifier);
+}
+
+module_init(gdth_init);
+module_exit(gdth_exit);
+
#ifndef MODULE
__setup("gdth=", option_setup);
#endif
diff --git a/drivers/scsi/gdth.h b/drivers/scsi/gdth.h
index e8b9eb7..e6178c4 100644
--- a/drivers/scsi/gdth.h
+++ b/drivers/scsi/gdth.h
@@ -854,6 +854,7 @@ typedef struct {
/* controller information structure */
typedef struct {
struct Scsi_Host *shost;
+ struct list_head list;
ushort hanum;
ushort oem_id; /* OEM */
ushort type; /* controller class */