1 files changed, 189 insertions, 115 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_tmf.c b/drivers/scsi/aic94xx/aic94xx_tmf.c
index 144f5ad20453..b9ac8f703a1d 100644
--- a/drivers/scsi/aic94xx/aic94xx_tmf.c
+++ b/drivers/scsi/aic94xx/aic94xx_tmf.c
@@ -53,50 +53,64 @@ static int asd_enqueue_internal(struct asd_ascb *ascb,
         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;
+/* ---------- CLEAR NEXUS ---------- */
 
-        spin_lock_irqsave(&seq->pend_q_lock, flags);
-        seq->pending--;
-        list_del_init(&ascb->list);
-        spin_unlock_irqrestore(&seq->pend_q_lock, flags);
-}
+struct tasklet_completion_status {
+        int     dl_opcode;
+        int     tmf_state;
+        u8      tag_valid:1;
+        __be16  tag;
+};
+
+#define DECLARE_TCS(tcs) \
+        struct tasklet_completion_status tcs = { \
+                .dl_opcode = 0, \
+                .tmf_state = 0, \
+                .tag_valid = 0, \
+                .tag = 0, \
+        }
 
-/* ---------- CLEAR NEXUS ---------- */
 
 static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
                                              struct done_list_struct *dl)
 {
+        struct tasklet_completion_status *tcs = ascb->uldd_task;
         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);
+        tcs->dl_opcode = dl->opcode;
+        complete(ascb->completion);
+        asd_ascb_free(ascb);
 }
 
 static void asd_clear_nexus_timedout(unsigned long data)
 {
-        struct asd_ascb *ascb = (void *) data;
+        struct asd_ascb *ascb = (void *)data;
+        struct tasklet_completion_status *tcs = ascb->uldd_task;
 
         ASD_DPRINTK("%s: here\n", __FUNCTION__);
-        asd_timedout_common(data);
-        ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
-        complete(&ascb->completion);
+        tcs->dl_opcode = TMF_RESP_FUNC_FAILED;
+        complete(ascb->completion);
 }
 
 #define CLEAR_NEXUS_PRE         \
+        struct asd_ascb *ascb; \
+        struct scb *scb; \
+        int res; \
+        DECLARE_COMPLETION_ONSTACK(completion); \
+        DECLARE_TCS(tcs); \
+                \
         ASD_DPRINTK("%s: PRE\n", __FUNCTION__); \
         res = 1;                \
         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
         if (!ascb)              \
                 return -ENOMEM; \
                                 \
+        ascb->completion = &completion; \
+        ascb->uldd_task = &tcs; \
         scb = ascb->scb;        \
         scb->header.opcode = CLEAR_NEXUS
 
@@ -107,10 +121,11 @@ static void asd_clear_nexus_timedout(unsigned long data)
         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; \
+        wait_for_completion(&completion); \
+        res = tcs.dl_opcode; \
         if (res == TC_NO_ERROR) \
                 res = TMF_RESP_FUNC_COMPLETE;   \
+        return res; \
 out_err:                        \
         asd_ascb_free(ascb);    \
         return res
@@ -118,9 +133,6 @@ out_err:                        \
 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;
@@ -130,9 +142,6 @@ int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
 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;
@@ -140,29 +149,73 @@ int asd_clear_nexus_port(struct asd_sas_port *port)
         CLEAR_NEXUS_POST;
 }
 
-#if 0
-static int asd_clear_nexus_I_T(struct domain_device *dev)
+enum clear_nexus_phase {
+        NEXUS_PHASE_PRE,
+        NEXUS_PHASE_POST,
+        NEXUS_PHASE_RESUME,
+};
+
+static int asd_clear_nexus_I_T(struct domain_device *dev,
+                               enum clear_nexus_phase phase)
 {
         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;
+        switch (phase) {
+        case NEXUS_PHASE_PRE:
+                scb->clear_nexus.flags = EXEC_Q | SUSPEND_TX;
+                break;
+        case NEXUS_PHASE_POST:
+                scb->clear_nexus.flags = SEND_Q | NOTINQ;
+                break;
+        case NEXUS_PHASE_RESUME:
+                scb->clear_nexus.flags = RESUME_TX;
+        }
         scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
                                                    dev->lldd_dev);
         CLEAR_NEXUS_POST;
 }
-#endif
+
+int asd_I_T_nexus_reset(struct domain_device *dev)
+{
+        int res, tmp_res, i;
+        struct sas_phy *phy = sas_find_local_phy(dev);
+        /* Standard mandates link reset for ATA  (type 0) and
+         * hard reset for SSP (type 1) */
+        int reset_type = (dev->dev_type == SATA_DEV ||
+                          (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
+
+        asd_clear_nexus_I_T(dev, NEXUS_PHASE_PRE);
+        /* send a hard reset */
+        ASD_DPRINTK("sending %s reset to %s\n",
+                    reset_type ? "hard" : "soft", phy->dev.bus_id);
+        res = sas_phy_reset(phy, reset_type);
+        if (res == TMF_RESP_FUNC_COMPLETE) {
+                /* wait for the maximum settle time */
+                msleep(500);
+                /* clear all outstanding commands (keep nexus suspended) */
+                asd_clear_nexus_I_T(dev, NEXUS_PHASE_POST);
+        }
+        for (i = 0 ; i < 3; i++) {
+                tmp_res = asd_clear_nexus_I_T(dev, NEXUS_PHASE_RESUME);
+                if (tmp_res == TC_RESUME)
+                        return res;
+                msleep(500);
+        }
+
+        /* This is a bit of a problem:  the sequencer is still suspended
+         * and is refusing to resume.  Hope it will resume on a bigger hammer
+         * or the disk is lost */
+        dev_printk(KERN_ERR, &phy->dev,
+                   "Failed to resume nexus after reset 0x%x\n", tmp_res);
+
+        return TMF_RESP_FUNC_FAILED;
+}
 
 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;
@@ -177,9 +230,6 @@ 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;
@@ -195,9 +245,6 @@ 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;
@@ -213,11 +260,11 @@ static int asd_clear_nexus_index(struct sas_task *task)
 static void asd_tmf_timedout(unsigned long data)
 {
         struct asd_ascb *ascb = (void *) data;
+        struct tasklet_completion_status *tcs = ascb->uldd_task;
 
         ASD_DPRINTK("tmf timed out\n");
-        asd_timedout_common(data);
-        ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
-        complete(&ascb->completion);
+        tcs->tmf_state = TMF_RESP_FUNC_FAILED;
+        complete(ascb->completion);
 }
 
 static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
@@ -269,18 +316,24 @@ static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
 static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
                                      struct done_list_struct *dl)
 {
+        struct tasklet_completion_status *tcs;
+
         if (!del_timer(&ascb->timer))
                 return;
 
+        tcs = ascb->uldd_task;
         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;
+        tcs->dl_opcode = dl->opcode;
+
+        if (dl->opcode == TC_SSP_RESP) {
+                tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
+                tcs->tag_valid = ascb->tag_valid;
+                tcs->tag = ascb->tag;
+        }
 
-        complete(&ascb->completion);
+        complete(ascb->completion);
+        asd_ascb_free(ascb);
 }
 
 static inline int asd_clear_nexus(struct sas_task *task)
@@ -288,15 +341,19 @@ 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;
+        DECLARE_COMPLETION_ONSTACK(completion);
         unsigned long flags;
 
+        tascb->completion = &completion;
+
         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,
+        leftover = wait_for_completion_timeout(&completion,
                                                AIC94XX_SCB_TIMEOUT);
+        tascb->completion = NULL;
         ASD_DPRINTK("came back from clear nexus\n");
         spin_lock_irqsave(&task->task_state_lock, flags);
         if (leftover < 1)
@@ -350,6 +407,11 @@ int asd_abort_task(struct sas_task *task)
         struct asd_ascb *ascb = NULL;
         struct scb *scb;
         int leftover;
+        DECLARE_TCS(tcs);
+        DECLARE_COMPLETION_ONSTACK(completion);
+        DECLARE_COMPLETION_ONSTACK(tascb_completion);
+
+        tascb->completion = &tascb_completion;
 
         spin_lock_irqsave(&task->task_state_lock, flags);
         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
@@ -363,8 +425,10 @@ int asd_abort_task(struct sas_task *task)
         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
         if (!ascb)
                 return -ENOMEM;
-        scb = ascb->scb;
 
+        ascb->uldd_task = &tcs;
+        ascb->completion = &completion;
+        scb = ascb->scb;
         scb->header.opcode = SCB_ABORT_TASK;
 
         switch (task->task_proto) {
@@ -406,13 +470,12 @@ int asd_abort_task(struct sas_task *task)
         res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
                                    asd_tmf_timedout);
         if (res)
-                goto out;
-        wait_for_completion(&ascb->completion);
+                goto out_free;
+        wait_for_completion(&completion);
         ASD_DPRINTK("tmf came back\n");
 
-        res = (int) (unsigned long) ascb->uldd_task;
-        tascb->tag = ascb->tag;
-        tascb->tag_valid = ascb->tag_valid;
+        tascb->tag = tcs.tag;
+        tascb->tag_valid = tcs.tag_valid;
 
         spin_lock_irqsave(&task->task_state_lock, flags);
         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
@@ -423,63 +486,68 @@ int asd_abort_task(struct sas_task *task)
         }
         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 */
+        if (tcs.dl_opcode == TC_SSP_RESP) {
+                /* The task to be aborted has been sent to the device.
+                 * We got a Response IU for the ABORT TASK TMF. */
+                if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
+                        res = asd_clear_nexus(task);
+                else
+                        res = tcs.tmf_state;
+        } else if (tcs.dl_opcode == TC_NO_ERROR &&
+                   tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
+                /* timeout */
                 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)
+        } else {
+                /* In the following we assume that the managing layer
+                 * will _never_ make a mistake, when issuing ABORT
+                 * TASK.
+                 */
+                switch (tcs.dl_opcode) {
+                default:
+                        res = asd_clear_nexus(task);
+                        /* fallthrough */
+                case TC_NO_ERROR:
+                        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:
+                        res = TMF_RESP_INVALID_FRAME;
+                        break;
+                case TF_TMF_TASK_DONE:  /* done but not reported yet */
                         res = TMF_RESP_FUNC_FAILED;
-                if (task->task_state_flags & SAS_TASK_STATE_DONE)
+                        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);
+                        break;
+                case TF_TMF_NO_TAG:
+                case TF_TMF_TAG_FREE: /* the tag is in the free list */
+                case TF_TMF_NO_CONN_HANDLE: /* no such device */
                         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;
+                        break;
+                case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
+                        res = TMF_RESP_FUNC_ESUPP;
+                        break;
+                }
         }
-out_done:
+ out_done:
+        tascb->completion = NULL;
         if (res == TMF_RESP_FUNC_COMPLETE) {
                 task->lldd_task = NULL;
                 mb();
                 asd_ascb_free(tascb);
         }
-out:
+        ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
+        return res;
+
+ out_free:
         asd_ascb_free(ascb);
         ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
         return res;
@@ -507,6 +575,8 @@ static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
         struct asd_ascb *ascb;
         int res = 1;
         struct scb *scb;
+        DECLARE_COMPLETION_ONSTACK(completion);
+        DECLARE_TCS(tcs);
 
         if (!(dev->tproto & SAS_PROTOCOL_SSP))
                 return TMF_RESP_FUNC_ESUPP;
@@ -514,6 +584,9 @@ static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
         if (!ascb)
                 return -ENOMEM;
+
+        ascb->completion = &completion;
+        ascb->uldd_task = &tcs;
         scb = ascb->scb;
 
         if (tmf == TMF_QUERY_TASK)
@@ -546,31 +619,32 @@ static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
                                    asd_tmf_timedout);
         if (res)
                 goto out_err;
-        wait_for_completion(&ascb->completion);
-        res = (int) (unsigned long) ascb->uldd_task;
+        wait_for_completion(&completion);
 
-        switch (res) {
-        case TC_NO_ERROR + 0xFF00:
+        switch (tcs.dl_opcode) {
+        case TC_NO_ERROR:
                 res = TMF_RESP_FUNC_COMPLETE;
                 break;
-        case TF_NAK_RECV + 0xFF00:
+        case TF_NAK_RECV:
                 res = TMF_RESP_INVALID_FRAME;
                 break;
-        case TF_TMF_TASK_DONE + 0xFF00:
+        case TF_TMF_TASK_DONE:
                 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 */
+        case TF_TMF_NO_TAG:
+        case TF_TMF_TAG_FREE: /* the tag is in the free list */
+        case TF_TMF_NO_CONN_HANDLE: /* no such device */
                 res = TMF_RESP_FUNC_COMPLETE;
                 break;
-        case TF_TMF_NO_CTX + 0xFF00: /* not in seq, or proto != SSP */
+        case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
                 res = TMF_RESP_FUNC_ESUPP;
                 break;
         default:
                 /* Allow TMF response codes to propagate upwards */
+                res = tcs.dl_opcode;
                 break;
         }
+        return res;
 out_err:
         asd_ascb_free(ascb);
         return res;