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linux-sg2042/drivers/scsi/aic94xx/aic94xx_tmf.c

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/*
* Aic94xx Task Management Functions
*
* 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
*
*/
#include <linux/spinlock.h>
#include "aic94xx.h"
#include "aic94xx_sas.h"
#include "aic94xx_hwi.h"
/* ---------- Internal enqueue ---------- */
static int asd_enqueue_internal(struct asd_ascb *ascb,
void (*tasklet_complete)(struct asd_ascb *,
struct done_list_struct *),
void (*timed_out)(unsigned long))
{
int res;
ascb->tasklet_complete = tasklet_complete;
ascb->uldd_timer = 1;
ascb->timer.data = (unsigned long) ascb;
ascb->timer.function = timed_out;
ascb->timer.expires = jiffies + AIC94XX_SCB_TIMEOUT;
add_timer(&ascb->timer);
res = asd_post_ascb_list(ascb->ha, ascb, 1);
if (unlikely(res))
del_timer(&ascb->timer);
return res;
}
static inline void asd_timedout_common(unsigned long data)
{
struct asd_ascb *ascb = (void *) data;
struct asd_seq_data *seq = &ascb->ha->seq;
unsigned long flags;
spin_lock_irqsave(&seq->pend_q_lock, flags);
seq->pending--;
list_del_init(&ascb->list);
spin_unlock_irqrestore(&seq->pend_q_lock, flags);
}
/* ---------- CLEAR NEXUS ---------- */
static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
struct done_list_struct *dl)
{
ASD_DPRINTK("%s: here\n", __FUNCTION__);
if (!del_timer(&ascb->timer)) {
ASD_DPRINTK("%s: couldn't delete timer\n", __FUNCTION__);
return;
}
ASD_DPRINTK("%s: opcode: 0x%x\n", __FUNCTION__, dl->opcode);
ascb->uldd_task = (void *) (unsigned long) dl->opcode;
complete(&ascb->completion);
}
static void asd_clear_nexus_timedout(unsigned long data)
{
struct asd_ascb *ascb = (void *) data;
ASD_DPRINTK("%s: here\n", __FUNCTION__);
asd_timedout_common(data);
ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
complete(&ascb->completion);
}
#define CLEAR_NEXUS_PRE \
ASD_DPRINTK("%s: PRE\n", __FUNCTION__); \
res = 1; \
ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
if (!ascb) \
return -ENOMEM; \
\
scb = ascb->scb; \
scb->header.opcode = CLEAR_NEXUS
#define CLEAR_NEXUS_POST \
ASD_DPRINTK("%s: POST\n", __FUNCTION__); \
res = asd_enqueue_internal(ascb, asd_clear_nexus_tasklet_complete, \
asd_clear_nexus_timedout); \
if (res) \
goto out_err; \
ASD_DPRINTK("%s: clear nexus posted, waiting...\n", __FUNCTION__); \
wait_for_completion(&ascb->completion); \
res = (int) (unsigned long) ascb->uldd_task; \
if (res == TC_NO_ERROR) \
res = TMF_RESP_FUNC_COMPLETE; \
out_err: \
asd_ascb_free(ascb); \
return res
int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
{
struct asd_ha_struct *asd_ha = sas_ha->lldd_ha;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_ADAPTER;
CLEAR_NEXUS_POST;
}
int asd_clear_nexus_port(struct asd_sas_port *port)
{
struct asd_ha_struct *asd_ha = port->ha->lldd_ha;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_PORT;
scb->clear_nexus.conn_mask = port->phy_mask;
CLEAR_NEXUS_POST;
}
#if 0
static int asd_clear_nexus_I_T(struct domain_device *dev)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_I_T;
scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
if (dev->tproto)
scb->clear_nexus.flags |= SUSPEND_TX;
scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
dev->lldd_dev);
CLEAR_NEXUS_POST;
}
#endif
static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_I_T_L;
scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
if (dev->tproto)
scb->clear_nexus.flags |= SUSPEND_TX;
memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
dev->lldd_dev);
CLEAR_NEXUS_POST;
}
static int asd_clear_nexus_tag(struct sas_task *task)
{
struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
struct asd_ascb *tascb = task->lldd_task;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_TAG;
memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
scb->clear_nexus.ssp_task.tag = tascb->tag;
if (task->dev->tproto)
scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
task->dev->lldd_dev);
CLEAR_NEXUS_POST;
}
static int asd_clear_nexus_index(struct sas_task *task)
{
struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
struct asd_ascb *tascb = task->lldd_task;
struct asd_ascb *ascb;
struct scb *scb;
int res;
CLEAR_NEXUS_PRE;
scb->clear_nexus.nexus = NEXUS_TRANS_CX;
if (task->dev->tproto)
scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
task->dev->lldd_dev);
scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
CLEAR_NEXUS_POST;
}
/* ---------- TMFs ---------- */
static void asd_tmf_timedout(unsigned long data)
{
struct asd_ascb *ascb = (void *) data;
ASD_DPRINTK("tmf timed out\n");
asd_timedout_common(data);
ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
complete(&ascb->completion);
}
static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
struct done_list_struct *dl)
{
struct asd_ha_struct *asd_ha = ascb->ha;
unsigned long flags;
struct tc_resp_sb_struct {
__le16 index_escb;
u8 len_lsb;
u8 flags;
} __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
int edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
struct asd_ascb *escb;
struct asd_dma_tok *edb;
struct ssp_frame_hdr *fh;
struct ssp_response_iu *ru;
int res = TMF_RESP_FUNC_FAILED;
ASD_DPRINTK("tmf resp tasklet\n");
spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
escb = asd_tc_index_find(&asd_ha->seq,
(int)le16_to_cpu(resp_sb->index_escb));
spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
if (!escb) {
ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
return res;
}
edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
ascb->tag = *(__be16 *)(edb->vaddr+4);
fh = edb->vaddr + 16;
ru = edb->vaddr + 16 + sizeof(*fh);
res = ru->status;
if (ru->datapres == 1) /* Response data present */
res = ru->resp_data[3];
#if 0
ascb->tag = fh->tag;
#endif
ascb->tag_valid = 1;
asd_invalidate_edb(escb, edb_id);
return res;
}
static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
struct done_list_struct *dl)
{
if (!del_timer(&ascb->timer))
return;
ASD_DPRINTK("tmf tasklet complete\n");
if (dl->opcode == TC_SSP_RESP)
ascb->uldd_task = (void *) (unsigned long)
asd_get_tmf_resp_tasklet(ascb, dl);
else
ascb->uldd_task = (void *) 0xFF00 + (unsigned long) dl->opcode;
complete(&ascb->completion);
}
static inline int asd_clear_nexus(struct sas_task *task)
{
int res = TMF_RESP_FUNC_FAILED;
int leftover;
struct asd_ascb *tascb = task->lldd_task;
unsigned long flags;
ASD_DPRINTK("task not done, clearing nexus\n");
if (tascb->tag_valid)
res = asd_clear_nexus_tag(task);
else
res = asd_clear_nexus_index(task);
leftover = wait_for_completion_timeout(&tascb->completion,
AIC94XX_SCB_TIMEOUT);
ASD_DPRINTK("came back from clear nexus\n");
spin_lock_irqsave(&task->task_state_lock, flags);
if (leftover < 1)
res = TMF_RESP_FUNC_FAILED;
if (task->task_state_flags & SAS_TASK_STATE_DONE)
res = TMF_RESP_FUNC_COMPLETE;
spin_unlock_irqrestore(&task->task_state_lock, flags);
return res;
}
/**
* asd_abort_task -- ABORT TASK TMF
* @task: the task to be aborted
*
* Before calling ABORT TASK the task state flags should be ORed with
* SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
* the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
*
* Implements the ABORT TASK TMF, I_T_L_Q nexus.
* Returns: SAS TMF responses (see sas_task.h),
* -ENOMEM,
* -SAS_QUEUE_FULL.
*
* When ABORT TASK returns, the caller of ABORT TASK checks first the
* task->task_state_flags, and then the return value of ABORT TASK.
*
* If the task has task state bit SAS_TASK_STATE_DONE set, then the
* task was completed successfully prior to it being aborted. The
* caller of ABORT TASK has responsibility to call task->task_done()
* xor free the task, depending on their framework. The return code
* is TMF_RESP_FUNC_FAILED in this case.
*
* Else the SAS_TASK_STATE_DONE bit is not set,
* If the return code is TMF_RESP_FUNC_COMPLETE, then
* the task was aborted successfully. The caller of
* ABORT TASK has responsibility to call task->task_done()
* to finish the task, xor free the task depending on their
* framework.
* else
* the ABORT TASK returned some kind of error. The task
* was _not_ cancelled. Nothing can be assumed.
* The caller of ABORT TASK may wish to retry.
*/
int asd_abort_task(struct sas_task *task)
{
struct asd_ascb *tascb = task->lldd_task;
struct asd_ha_struct *asd_ha = tascb->ha;
int res = 1;
unsigned long flags;
struct asd_ascb *ascb = NULL;
struct scb *scb;
int leftover;
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
res = TMF_RESP_FUNC_COMPLETE;
ASD_DPRINTK("%s: task 0x%p done\n", __FUNCTION__, task);
goto out_done;
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
if (!ascb)
return -ENOMEM;
scb = ascb->scb;
scb->header.opcode = ABORT_TASK;
switch (task->task_proto) {
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
break;
case SAS_PROTOCOL_SSP:
scb->abort_task.proto_conn_rate = (1 << 4); /* SSP */
scb->abort_task.proto_conn_rate |= task->dev->linkrate;
break;
case SAS_PROTOCOL_SMP:
break;
default:
break;
}
if (task->task_proto == SAS_PROTOCOL_SSP) {
scb->abort_task.ssp_frame.frame_type = SSP_TASK;
memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
task->dev->port->ha->hashed_sas_addr,
HASHED_SAS_ADDR_SIZE);
scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
}
scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
scb->abort_task.conn_handle = cpu_to_le16(
(u16)(unsigned long)task->dev->lldd_dev);
scb->abort_task.retry_count = 1;
scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
asd_tmf_timedout);
if (res)
goto out;
wait_for_completion(&ascb->completion);
ASD_DPRINTK("tmf came back\n");
res = (int) (unsigned long) ascb->uldd_task;
tascb->tag = ascb->tag;
tascb->tag_valid = ascb->tag_valid;
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
res = TMF_RESP_FUNC_COMPLETE;
ASD_DPRINTK("%s: task 0x%p done\n", __FUNCTION__, task);
goto out_done;
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
switch (res) {
/* The task to be aborted has been sent to the device.
* We got a Response IU for the ABORT TASK TMF. */
case TC_NO_ERROR + 0xFF00:
case TMF_RESP_FUNC_COMPLETE:
case TMF_RESP_FUNC_FAILED:
res = asd_clear_nexus(task);
break;
case TMF_RESP_INVALID_FRAME:
case TMF_RESP_OVERLAPPED_TAG:
case TMF_RESP_FUNC_ESUPP:
case TMF_RESP_NO_LUN:
goto out_done; break;
}
/* In the following we assume that the managing layer
* will _never_ make a mistake, when issuing ABORT TASK.
*/
switch (res) {
default:
res = asd_clear_nexus(task);
/* fallthrough */
case TC_NO_ERROR + 0xFF00:
case TMF_RESP_FUNC_COMPLETE:
break;
/* The task hasn't been sent to the device xor we never got
* a (sane) Response IU for the ABORT TASK TMF.
*/
case TF_NAK_RECV + 0xFF00:
res = TMF_RESP_INVALID_FRAME;
break;
case TF_TMF_TASK_DONE + 0xFF00: /* done but not reported yet */
res = TMF_RESP_FUNC_FAILED;
leftover = wait_for_completion_timeout(&tascb->completion,
AIC94XX_SCB_TIMEOUT);
spin_lock_irqsave(&task->task_state_lock, flags);
if (leftover < 1)
res = TMF_RESP_FUNC_FAILED;
if (task->task_state_flags & SAS_TASK_STATE_DONE)
res = TMF_RESP_FUNC_COMPLETE;
spin_unlock_irqrestore(&task->task_state_lock, flags);
goto out_done;
case TF_TMF_NO_TAG + 0xFF00:
case TF_TMF_TAG_FREE + 0xFF00: /* the tag is in the free list */
case TF_TMF_NO_CONN_HANDLE + 0xFF00: /* no such device */
res = TMF_RESP_FUNC_COMPLETE;
goto out_done;
case TF_TMF_NO_CTX + 0xFF00: /* not in seq, or proto != SSP */
res = TMF_RESP_FUNC_ESUPP;
goto out;
}
out_done:
if (res == TMF_RESP_FUNC_COMPLETE) {
task->lldd_task = NULL;
mb();
asd_ascb_free(tascb);
}
out:
asd_ascb_free(ascb);
ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
return res;
}
/**
* asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
* @dev: pointer to struct domain_device of interest
* @lun: pointer to u8[8] which is the LUN
* @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
* @index: the transaction context of the task to be queried if QT TMF
*
* This function is used to send ABORT TASK SET, CLEAR ACA,
* CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
*
* No SCBs should be queued to the I_T_L nexus when this SCB is
* pending.
*
* Returns: TMF response code (see sas_task.h or the SAS spec)
*/
static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
int tmf, int index)
{
struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
struct asd_ascb *ascb;
int res = 1;
struct scb *scb;
if (!(dev->tproto & SAS_PROTOCOL_SSP))
return TMF_RESP_FUNC_ESUPP;
ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
if (!ascb)
return -ENOMEM;
scb = ascb->scb;
if (tmf == TMF_QUERY_TASK)
scb->header.opcode = QUERY_SSP_TASK;
else
scb->header.opcode = INITIATE_SSP_TMF;
scb->ssp_tmf.proto_conn_rate = (1 << 4); /* SSP */
scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
/* SSP frame header */
scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
/* SSP Task IU */
memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
scb->ssp_tmf.ssp_task.tmf = tmf;
scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
dev->lldd_dev);
scb->ssp_tmf.retry_count = 1;
scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
if (tmf == TMF_QUERY_TASK)
scb->ssp_tmf.index = cpu_to_le16(index);
res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
asd_tmf_timedout);
if (res)
goto out_err;
wait_for_completion(&ascb->completion);
res = (int) (unsigned long) ascb->uldd_task;
switch (res) {
case TC_NO_ERROR + 0xFF00:
res = TMF_RESP_FUNC_COMPLETE;
break;
case TF_NAK_RECV + 0xFF00:
res = TMF_RESP_INVALID_FRAME;
break;
case TF_TMF_TASK_DONE + 0xFF00:
res = TMF_RESP_FUNC_FAILED;
break;
case TF_TMF_NO_TAG + 0xFF00:
case TF_TMF_TAG_FREE + 0xFF00: /* the tag is in the free list */
case TF_TMF_NO_CONN_HANDLE + 0xFF00: /* no such device */
res = TMF_RESP_FUNC_COMPLETE;
break;
case TF_TMF_NO_CTX + 0xFF00: /* not in seq, or proto != SSP */
res = TMF_RESP_FUNC_ESUPP;
break;
default:
/* Allow TMF response codes to propagate upwards */
break;
}
out_err:
asd_ascb_free(ascb);
return res;
}
int asd_abort_task_set(struct domain_device *dev, u8 *lun)
{
int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);
if (res == TMF_RESP_FUNC_COMPLETE)
asd_clear_nexus_I_T_L(dev, lun);
return res;
}
int asd_clear_aca(struct domain_device *dev, u8 *lun)
{
int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_ACA, 0);
if (res == TMF_RESP_FUNC_COMPLETE)
asd_clear_nexus_I_T_L(dev, lun);
return res;
}
int asd_clear_task_set(struct domain_device *dev, u8 *lun)
{
int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);
if (res == TMF_RESP_FUNC_COMPLETE)
asd_clear_nexus_I_T_L(dev, lun);
return res;
}
int asd_lu_reset(struct domain_device *dev, u8 *lun)
{
int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);
if (res == TMF_RESP_FUNC_COMPLETE)
asd_clear_nexus_I_T_L(dev, lun);
return res;
}
/**
* asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
* task: pointer to sas_task struct of interest
*
* Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
* or TMF_RESP_FUNC_SUCC if the task is in the task set.
*
* Normally the management layer sets the task to aborted state,
* and then calls query task and then abort task.
*/
int asd_query_task(struct sas_task *task)
{
struct asd_ascb *ascb = task->lldd_task;
int index;
if (ascb) {
index = ascb->tc_index;
return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
TMF_QUERY_TASK, index);
}
return TMF_RESP_FUNC_COMPLETE;
}
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