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kernel-ark/drivers/scsi/aic94xx/aic94xx_dev.c
Darrick J. Wong 57ba07dc54 [SCSI] aic94xx: Lock DDB read/write accesses 
Extend the use of the DDB lock to include all DDB accesses, because
DDB updates now occur from multiple threads.  This fixes the SMP timeout
problems that we were occasionally seeing with a x260, because the
controller got confused when the DDBs got corrupted.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-01-13 16:19:42 -06:00

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/*
* Aic94xx SAS/SATA DDB management
*
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
*
* This file is licensed under GPLv2.
*
* This file is part of the aic94xx driver.
*
* The aic94xx driver is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of the
* License.
*
* The aic94xx driver is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the aic94xx driver; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id: //depot/aic94xx/aic94xx_dev.c#21 $
*/
#include "aic94xx.h"
#include "aic94xx_hwi.h"
#include "aic94xx_reg.h"
#include "aic94xx_sas.h"
#define FIND_FREE_DDB(_ha) find_first_zero_bit((_ha)->hw_prof.ddb_bitmap, \
(_ha)->hw_prof.max_ddbs)
#define SET_DDB(_ddb, _ha) set_bit(_ddb, (_ha)->hw_prof.ddb_bitmap)
#define CLEAR_DDB(_ddb, _ha) clear_bit(_ddb, (_ha)->hw_prof.ddb_bitmap)
static inline int asd_get_ddb(struct asd_ha_struct *asd_ha)
{
int ddb, i;
ddb = FIND_FREE_DDB(asd_ha);
if (ddb >= asd_ha->hw_prof.max_ddbs) {
ddb = -ENOMEM;
goto out;
}
SET_DDB(ddb, asd_ha);
for (i = 0; i < sizeof(struct asd_ddb_ssp_smp_target_port); i+= 4)
asd_ddbsite_write_dword(asd_ha, ddb, i, 0);
out:
return ddb;
}
#define INIT_CONN_TAG offsetof(struct asd_ddb_ssp_smp_target_port, init_conn_tag)
#define DEST_SAS_ADDR offsetof(struct asd_ddb_ssp_smp_target_port, dest_sas_addr)
#define SEND_QUEUE_HEAD offsetof(struct asd_ddb_ssp_smp_target_port, send_queue_head)
#define DDB_TYPE offsetof(struct asd_ddb_ssp_smp_target_port, ddb_type)
#define CONN_MASK offsetof(struct asd_ddb_ssp_smp_target_port, conn_mask)
#define DDB_TARG_FLAGS offsetof(struct asd_ddb_ssp_smp_target_port, flags)
#define DDB_TARG_FLAGS2 offsetof(struct asd_ddb_stp_sata_target_port, flags2)
#define EXEC_QUEUE_TAIL offsetof(struct asd_ddb_ssp_smp_target_port, exec_queue_tail)
#define SEND_QUEUE_TAIL offsetof(struct asd_ddb_ssp_smp_target_port, send_queue_tail)
#define SISTER_DDB offsetof(struct asd_ddb_ssp_smp_target_port, sister_ddb)
#define MAX_CCONN offsetof(struct asd_ddb_ssp_smp_target_port, max_concurrent_conn)
#define NUM_CTX offsetof(struct asd_ddb_ssp_smp_target_port, num_contexts)
#define ATA_CMD_SCBPTR offsetof(struct asd_ddb_stp_sata_target_port, ata_cmd_scbptr)
#define SATA_TAG_ALLOC_MASK offsetof(struct asd_ddb_stp_sata_target_port, sata_tag_alloc_mask)
#define NUM_SATA_TAGS offsetof(struct asd_ddb_stp_sata_target_port, num_sata_tags)
#define SATA_STATUS offsetof(struct asd_ddb_stp_sata_target_port, sata_status)
#define NCQ_DATA_SCB_PTR offsetof(struct asd_ddb_stp_sata_target_port, ncq_data_scb_ptr)
#define ITNL_TIMEOUT offsetof(struct asd_ddb_ssp_smp_target_port, itnl_timeout)
static inline void asd_free_ddb(struct asd_ha_struct *asd_ha, int ddb)
{
if (!ddb || ddb >= 0xFFFF)
return;
asd_ddbsite_write_byte(asd_ha, ddb, DDB_TYPE, DDB_TYPE_UNUSED);
CLEAR_DDB(ddb, asd_ha);
}
static inline void asd_set_ddb_type(struct domain_device *dev)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
int ddb = (int) (unsigned long) dev->lldd_dev;
if (dev->dev_type == SATA_PM_PORT)
asd_ddbsite_write_byte(asd_ha,ddb, DDB_TYPE, DDB_TYPE_PM_PORT);
else if (dev->tproto)
asd_ddbsite_write_byte(asd_ha,ddb, DDB_TYPE, DDB_TYPE_TARGET);
else
asd_ddbsite_write_byte(asd_ha,ddb,DDB_TYPE,DDB_TYPE_INITIATOR);
}
static int asd_init_sata_tag_ddb(struct domain_device *dev)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
int ddb, i;
ddb = asd_get_ddb(asd_ha);
if (ddb < 0)
return ddb;
for (i = 0; i < sizeof(struct asd_ddb_sata_tag); i += 2)
asd_ddbsite_write_word(asd_ha, ddb, i, 0xFFFF);
asd_ddbsite_write_word(asd_ha, (int) (unsigned long) dev->lldd_dev,
SISTER_DDB, ddb);
return 0;
}
static inline int asd_init_sata(struct domain_device *dev)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
int ddb = (int) (unsigned long) dev->lldd_dev;
u32 qdepth = 0;
int res = 0;
asd_ddbsite_write_word(asd_ha, ddb, ATA_CMD_SCBPTR, 0xFFFF);
if ((dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT) &&
dev->sata_dev.identify_device &&
dev->sata_dev.identify_device[10] != 0) {
u16 w75 = le16_to_cpu(dev->sata_dev.identify_device[75]);
u16 w76 = le16_to_cpu(dev->sata_dev.identify_device[76]);
if (w76 & 0x100) /* NCQ? */
qdepth = (w75 & 0x1F) + 1;
asd_ddbsite_write_dword(asd_ha, ddb, SATA_TAG_ALLOC_MASK,
(1<<qdepth)-1);
asd_ddbsite_write_byte(asd_ha, ddb, NUM_SATA_TAGS, qdepth);
}
if (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM ||
dev->dev_type == SATA_PM_PORT) {
struct dev_to_host_fis *fis = (struct dev_to_host_fis *)
dev->frame_rcvd;
asd_ddbsite_write_byte(asd_ha, ddb, SATA_STATUS, fis->status);
}
asd_ddbsite_write_word(asd_ha, ddb, NCQ_DATA_SCB_PTR, 0xFFFF);
if (qdepth > 0)
res = asd_init_sata_tag_ddb(dev);
return res;
}
static int asd_init_target_ddb(struct domain_device *dev)
{
int ddb, i;
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
u8 flags = 0;
ddb = asd_get_ddb(asd_ha);
if (ddb < 0)
return ddb;
dev->lldd_dev = (void *) (unsigned long) ddb;
asd_ddbsite_write_byte(asd_ha, ddb, 0, DDB_TP_CONN_TYPE);
asd_ddbsite_write_byte(asd_ha, ddb, 1, 0);
asd_ddbsite_write_word(asd_ha, ddb, INIT_CONN_TAG, 0xFFFF);
for (i = 0; i < SAS_ADDR_SIZE; i++)
asd_ddbsite_write_byte(asd_ha, ddb, DEST_SAS_ADDR+i,
dev->sas_addr[i]);
asd_ddbsite_write_word(asd_ha, ddb, SEND_QUEUE_HEAD, 0xFFFF);
asd_set_ddb_type(dev);
asd_ddbsite_write_byte(asd_ha, ddb, CONN_MASK, dev->port->phy_mask);
if (dev->port->oob_mode != SATA_OOB_MODE) {
flags |= OPEN_REQUIRED;
if ((dev->dev_type == SATA_DEV) ||
(dev->tproto & SAS_PROTO_STP)) {
struct smp_resp *rps_resp = &dev->sata_dev.rps_resp;
if (rps_resp->frame_type == SMP_RESPONSE &&
rps_resp->function == SMP_REPORT_PHY_SATA &&
rps_resp->result == SMP_RESP_FUNC_ACC) {
if (rps_resp->rps.affil_valid)
flags |= STP_AFFIL_POL;
if (rps_resp->rps.affil_supp)
flags |= SUPPORTS_AFFIL;
}
} else {
flags |= CONCURRENT_CONN_SUPP;
if (!dev->parent &&
(dev->dev_type == EDGE_DEV ||
dev->dev_type == FANOUT_DEV))
asd_ddbsite_write_byte(asd_ha, ddb, MAX_CCONN,
4);
else
asd_ddbsite_write_byte(asd_ha, ddb, MAX_CCONN,
dev->pathways);
asd_ddbsite_write_byte(asd_ha, ddb, NUM_CTX, 1);
}
}
if (dev->dev_type == SATA_PM)
flags |= SATA_MULTIPORT;
asd_ddbsite_write_byte(asd_ha, ddb, DDB_TARG_FLAGS, flags);
flags = 0;
if (dev->tproto & SAS_PROTO_STP)
flags |= STP_CL_POL_NO_TX;
asd_ddbsite_write_byte(asd_ha, ddb, DDB_TARG_FLAGS2, flags);
asd_ddbsite_write_word(asd_ha, ddb, EXEC_QUEUE_TAIL, 0xFFFF);
asd_ddbsite_write_word(asd_ha, ddb, SEND_QUEUE_TAIL, 0xFFFF);
asd_ddbsite_write_word(asd_ha, ddb, SISTER_DDB, 0xFFFF);
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTO_STP)) {
i = asd_init_sata(dev);
if (i < 0) {
asd_free_ddb(asd_ha, ddb);
return i;
}
}
if (dev->dev_type == SAS_END_DEV) {
struct sas_end_device *rdev = rphy_to_end_device(dev->rphy);
if (rdev->I_T_nexus_loss_timeout > 0)
asd_ddbsite_write_word(asd_ha, ddb, ITNL_TIMEOUT,
min(rdev->I_T_nexus_loss_timeout,
(u16)ITNL_TIMEOUT_CONST));
else
asd_ddbsite_write_word(asd_ha, ddb, ITNL_TIMEOUT,
(u16)ITNL_TIMEOUT_CONST);
}
return 0;
}
static int asd_init_sata_pm_table_ddb(struct domain_device *dev)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
int ddb, i;
ddb = asd_get_ddb(asd_ha);
if (ddb < 0)
return ddb;
for (i = 0; i < 32; i += 2)
asd_ddbsite_write_word(asd_ha, ddb, i, 0xFFFF);
asd_ddbsite_write_word(asd_ha, (int) (unsigned long) dev->lldd_dev,
SISTER_DDB, ddb);
return 0;
}
#define PM_PORT_FLAGS offsetof(struct asd_ddb_sata_pm_port, pm_port_flags)
#define PARENT_DDB offsetof(struct asd_ddb_sata_pm_port, parent_ddb)
/**
* asd_init_sata_pm_port_ddb -- SATA Port Multiplier Port
* dev: pointer to domain device
*
* For SATA Port Multiplier Ports we need to allocate one SATA Port
* Multiplier Port DDB and depending on whether the target on it
* supports SATA II NCQ, one SATA Tag DDB.
*/
static int asd_init_sata_pm_port_ddb(struct domain_device *dev)
{
int ddb, i, parent_ddb, pmtable_ddb;
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
u8 flags;
ddb = asd_get_ddb(asd_ha);
if (ddb < 0)
return ddb;
asd_set_ddb_type(dev);
flags = (dev->sata_dev.port_no << 4) | PM_PORT_SET;
asd_ddbsite_write_byte(asd_ha, ddb, PM_PORT_FLAGS, flags);
asd_ddbsite_write_word(asd_ha, ddb, SISTER_DDB, 0xFFFF);
asd_ddbsite_write_word(asd_ha, ddb, ATA_CMD_SCBPTR, 0xFFFF);
asd_init_sata(dev);
parent_ddb = (int) (unsigned long) dev->parent->lldd_dev;
asd_ddbsite_write_word(asd_ha, ddb, PARENT_DDB, parent_ddb);
pmtable_ddb = asd_ddbsite_read_word(asd_ha, parent_ddb, SISTER_DDB);
asd_ddbsite_write_word(asd_ha, pmtable_ddb, dev->sata_dev.port_no,ddb);
if (asd_ddbsite_read_byte(asd_ha, ddb, NUM_SATA_TAGS) > 0) {
i = asd_init_sata_tag_ddb(dev);
if (i < 0) {
asd_free_ddb(asd_ha, ddb);
return i;
}
}
return 0;
}
static int asd_init_initiator_ddb(struct domain_device *dev)
{
return -ENODEV;
}
/**
* asd_init_sata_pm_ddb -- SATA Port Multiplier
* dev: pointer to domain device
*
* For STP and direct-attached SATA Port Multipliers we need
* one target port DDB entry and one SATA PM table DDB entry.
*/
static int asd_init_sata_pm_ddb(struct domain_device *dev)
{
int res = 0;
res = asd_init_target_ddb(dev);
if (res)
goto out;
res = asd_init_sata_pm_table_ddb(dev);
if (res)
asd_free_ddb(dev->port->ha->lldd_ha,
(int) (unsigned long) dev->lldd_dev);
out:
return res;
}
int asd_dev_found(struct domain_device *dev)
{
unsigned long flags;
int res = 0;
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
spin_lock_irqsave(&asd_ha->hw_prof.ddb_lock, flags);
switch (dev->dev_type) {
case SATA_PM:
res = asd_init_sata_pm_ddb(dev);
break;
case SATA_PM_PORT:
res = asd_init_sata_pm_port_ddb(dev);
break;
default:
if (dev->tproto)
res = asd_init_target_ddb(dev);
else
res = asd_init_initiator_ddb(dev);
}
spin_unlock_irqrestore(&asd_ha->hw_prof.ddb_lock, flags);
return res;
}
void asd_dev_gone(struct domain_device *dev)
{
int ddb, sister_ddb;
unsigned long flags;
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
spin_lock_irqsave(&asd_ha->hw_prof.ddb_lock, flags);
ddb = (int) (unsigned long) dev->lldd_dev;
sister_ddb = asd_ddbsite_read_word(asd_ha, ddb, SISTER_DDB);
if (sister_ddb != 0xFFFF)
asd_free_ddb(asd_ha, sister_ddb);
asd_free_ddb(asd_ha, ddb);
dev->lldd_dev = NULL;
spin_unlock_irqrestore(&asd_ha->hw_prof.ddb_lock, flags);
}
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