[SCSI] qlogicpti: Add a slave_configure method

By configuring targets in slave_configure, we can eliminate a shadow
queuecommand, a shadow scsi_done, a write to the host template, abuse of
SCp->Message and SCp->Status, a use of kmap_atomic() and sniffing the
results of INQUIRY.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 27 insertions, 147 deletions

diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index 594887205b0..e93f80316a1 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -310,8 +310,6 @@ static inline void qlogicpti_set_hostdev_defaults(struct qlogicpti *qpti)
                 }
                 qpti->dev_param[i].device_enable = 1;
         }
-        /* this is very important to set! */
-        qpti->sbits = 1 << qpti->scsi_id;
 }
 
 static int qlogicpti_reset_hardware(struct Scsi_Host *host)
@@ -951,153 +949,35 @@ static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int
         host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
 }
 
-static unsigned int scsi_rbuf_get(struct scsi_cmnd *cmd, unsigned char **buf_out)
+static int qlogicpti_slave_configure(struct scsi_device *sdev)
 {
-        unsigned char *buf;
-        unsigned int buflen;
-
-        if (cmd->use_sg) {
-                struct scatterlist *sg;
+        struct qlogicpti *qpti = shost_priv(sdev->host);
+        int tgt = sdev->id;
+        u_short param[6];
 
-                sg = (struct scatterlist *) cmd->request_buffer;
-                buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
-                buflen = sg->length;
+        /* tags handled in midlayer */
+        /* enable sync mode? */
+        if (sdev->sdtr) {
+                qpti->dev_param[tgt].device_flags |= 0x10;
         } else {
-                buf = cmd->request_buffer;
-                buflen = cmd->request_bufflen;
+                qpti->dev_param[tgt].synchronous_offset = 0;
+                qpti->dev_param[tgt].synchronous_period = 0;
         }
-
-        *buf_out = buf;
-        return buflen;
-}
-
-static void scsi_rbuf_put(struct scsi_cmnd *cmd, unsigned char *buf)
-{
-        if (cmd->use_sg) {
-                struct scatterlist *sg;
-
-                sg = (struct scatterlist *) cmd->request_buffer;
-                kunmap_atomic(buf - sg->offset, KM_IRQ0);
-        }
-}
-
-/*
- * Until we scan the entire bus with inquiries, go throught this fella...
- */
-static void ourdone(struct scsi_cmnd *Cmnd)
-{
-        struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;
-        int tgt = Cmnd->device->id;
-        void (*done) (struct scsi_cmnd *);
-
-        /* This grot added by DaveM, blame him for ugliness.
-         * The issue is that in the 2.3.x driver we use the
-         * host_scribble portion of the scsi command as a
-         * completion linked list at interrupt service time,
-         * so we have to store the done function pointer elsewhere.
-         */
-        done = (void (*)(struct scsi_cmnd *))
-                (((unsigned long) Cmnd->SCp.Message)
-#ifdef __sparc_v9__
-                 | ((unsigned long) Cmnd->SCp.Status << 32UL)
-#endif
-                 );
-
-        if ((qpti->sbits & (1 << tgt)) == 0) {
-                int ok = host_byte(Cmnd->result) == DID_OK;
-                if (Cmnd->cmnd[0] == 0x12 && ok) {
-                        unsigned char *iqd;
-                        unsigned int iqd_len;
-
-                        iqd_len = scsi_rbuf_get(Cmnd, &iqd);
-
-                        /* tags handled in midlayer */
-                        /* enable sync mode? */
-                        if (iqd[7] & 0x10) {
-                                qpti->dev_param[tgt].device_flags |= 0x10;
-                        } else {
-                                qpti->dev_param[tgt].synchronous_offset = 0;
-                                qpti->dev_param[tgt].synchronous_period = 0;
-                        }
-                        /* are we wide capable? */
-                        if (iqd[7] & 0x20) {
-                                qpti->dev_param[tgt].device_flags |= 0x20;
-                        }
-
-                        scsi_rbuf_put(Cmnd, iqd);
-
-                        qpti->sbits |= (1 << tgt);
-                } else if (!ok) {
-                        qpti->sbits |= (1 << tgt);
-                }
-        }
-        done(Cmnd);
-}
-
-static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *));
-
-static int qlogicpti_queuecommand_slow(struct scsi_cmnd *Cmnd,
-                                       void (*done)(struct scsi_cmnd *))
-{
-        struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;
-
-        /*
-         * done checking this host adapter?
-         * If not, then rewrite the command
-         * to finish through ourdone so we
-         * can peek at Inquiry data results.
-         */
-        if (qpti->sbits && qpti->sbits != 0xffff) {
-                /* See above about in ourdone this ugliness... */
-                Cmnd->SCp.Message = ((unsigned long)done) & 0xffffffff;
-#ifdef CONFIG_SPARC64
-                Cmnd->SCp.Status = ((unsigned long)done >> 32UL) & 0xffffffff;
-#endif
-                return qlogicpti_queuecommand(Cmnd, ourdone);
-        }
-
-        /*
-         * We've peeked at all targets for this bus- time
-         * to set parameters for devices for real now.
-         */
-        if (qpti->sbits == 0xffff) {
-                int i;
-                for(i = 0; i < MAX_TARGETS; i++) {
-                        u_short param[6];
-                        param[0] = MBOX_SET_TARGET_PARAMS;
-                        param[1] = (i << 8);
-                        param[2] = (qpti->dev_param[i].device_flags << 8);
-                        if (qpti->dev_param[i].device_flags & 0x10) {
-                                param[3] = (qpti->dev_param[i].synchronous_offset << 8) |
-                                        qpti->dev_param[i].synchronous_period;
-                        } else {
-                                param[3] = 0;
-                        }
-                        (void) qlogicpti_mbox_command(qpti, param, 0);
-                }
-                /*
-                 * set to zero so any traverse through ourdone
-                 * doesn't start the whole process again,
-                 */
-                qpti->sbits = 0;
-        }
-
-        /* check to see if we're done with all adapters... */
-        for (qpti = qptichain; qpti != NULL; qpti = qpti->next) {
-                if (qpti->sbits) {
-                        break;
-                }
+        /* are we wide capable? */
+        if (sdev->wdtr)
+                qpti->dev_param[tgt].device_flags |= 0x20;
+
+        param[0] = MBOX_SET_TARGET_PARAMS;
+        param[1] = (tgt << 8);
+        param[2] = (qpti->dev_param[tgt].device_flags << 8);
+        if (qpti->dev_param[tgt].device_flags & 0x10) {
+                param[3] = (qpti->dev_param[tgt].synchronous_offset << 8) |
+                        qpti->dev_param[tgt].synchronous_period;
+        } else {
+                param[3] = 0;
         }
-
-        /*
-         * if we hit the end of the chain w/o finding adapters still
-         * capability-configuring, then we're done with all adapters
-         * and can rock on..
-         */
-        if (qpti == NULL)
-                Cmnd->device->host->hostt->queuecommand = qlogicpti_queuecommand;
-
-        return qlogicpti_queuecommand(Cmnd, done);
+        qlogicpti_mbox_command(qpti, param, 0);
+        return 0;
 }
 
 /*
@@ -1390,7 +1270,8 @@ static struct scsi_host_template qpti_template = {
         .module                 = THIS_MODULE,
         .name                   = "qlogicpti",
         .info                   = qlogicpti_info,
-        .queuecommand           = qlogicpti_queuecommand_slow,
+        .queuecommand           = qlogicpti_queuecommand,
+        .slave_configure        = qlogicpti_slave_configure,
         .eh_abort_handler       = qlogicpti_abort,
         .eh_bus_reset_handler   = qlogicpti_reset,
         .can_queue              = QLOGICPTI_REQ_QUEUE_LEN,
diff --git a/drivers/scsi/qlogicpti.h b/drivers/scsi/qlogicpti.h
index 6cd1c0771d2..ef6da2df584 100644
--- a/drivers/scsi/qlogicpti.h
+++ b/drivers/scsi/qlogicpti.h
@@ -380,8 +380,7 @@ struct qlogicpti {
         unsigned char             swsreg;
         unsigned int    
                 gotirq  :       1,      /* this instance got an irq */
-                is_pti  :       1,      /* Non-zero if this is a PTI board. */
-                sbits   :       16;     /* syncmode known bits */
+                is_pti  :       1;      /* Non-zero if this is a PTI board. */
 };
 
 /* How to twiddle them bits... */