Merge branch 'upstream-fixes' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev

4 files changed, 97 insertions, 77 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 4e96ec5f2ff9..894e7113e0b3 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -565,6 +565,17 @@ static void ahci_intr_error(struct ata_port *ap, u32 irq_stat)
         u32 tmp;
         int work;
 
+        printk(KERN_WARNING "ata%u: port reset, "
+               "p_is %x is %x pis %x cmd %x tf %x ss %x se %x\n",
+                ap->id,
+                irq_stat,
+                readl(mmio + HOST_IRQ_STAT),
+                readl(port_mmio + PORT_IRQ_STAT),
+                readl(port_mmio + PORT_CMD),
+                readl(port_mmio + PORT_TFDATA),
+                readl(port_mmio + PORT_SCR_STAT),
+                readl(port_mmio + PORT_SCR_ERR));
+
         /* stop DMA */
         tmp = readl(port_mmio + PORT_CMD);
         tmp &= ~PORT_CMD_START;
@@ -602,8 +613,6 @@ static void ahci_intr_error(struct ata_port *ap, u32 irq_stat)
         tmp |= PORT_CMD_START;
         writel(tmp, port_mmio + PORT_CMD);
         readl(port_mmio + PORT_CMD); /* flush */
-
-        printk(KERN_WARNING "ata%u: error occurred, port reset\n", ap->id);
 }
 
 static void ahci_eng_timeout(struct ata_port *ap)
@@ -614,17 +623,17 @@ static void ahci_eng_timeout(struct ata_port *ap)
         struct ata_queued_cmd *qc;
         unsigned long flags;
 
-        DPRINTK("ENTER\n");
+        printk(KERN_WARNING "ata%u: handling error/timeout\n", ap->id);
 
         spin_lock_irqsave(&host_set->lock, flags);
 
-        ahci_intr_error(ap, readl(port_mmio + PORT_IRQ_STAT));
-
         qc = ata_qc_from_tag(ap, ap->active_tag);
         if (!qc) {
                 printk(KERN_ERR "ata%u: BUG: timeout without command\n",
                        ap->id);
         } else {
+                ahci_intr_error(ap, readl(port_mmio + PORT_IRQ_STAT));
+
                 /* hack alert!  We cannot use the supplied completion
                  * function from inside the ->eh_strategy_handler() thread.
                  * libata is the only user of ->eh_strategy_handler() in
@@ -659,9 +668,19 @@ static inline int ahci_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
         }
 
         if (status & PORT_IRQ_FATAL) {
+                unsigned int err_mask;
+                if (status & PORT_IRQ_TF_ERR)
+                        err_mask = AC_ERR_DEV;
+                else if (status & PORT_IRQ_IF_ERR)
+                        err_mask = AC_ERR_ATA_BUS;
+                else
+                        err_mask = AC_ERR_HOST_BUS;
+
+                /* command processing has stopped due to error; restart */
                 ahci_intr_error(ap, status);
+
                 if (qc)
-                        ata_qc_complete(qc, AC_ERR_OTHER);
+                        ata_qc_complete(qc, err_mask);
         }
 
         return 1;
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index d81db3a3d4b9..ba1eb8b38e00 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1263,7 +1263,7 @@ retry:
         }
 
         /* ATAPI-specific feature tests */
-        else {
+        else if (dev->class == ATA_DEV_ATAPI) {
                 if (ata_id_is_ata(dev->id))             /* sanity check */
                         goto err_out_nosup;
 
@@ -2399,7 +2399,7 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
         if (qc->flags & ATA_QCFLAG_SINGLE)
                 assert(qc->n_elem == 1);
 
-        DPRINTK("unmapping %u sg elements\n", qc->n_elem);
+        VPRINTK("unmapping %u sg elements\n", qc->n_elem);
 
         /* if we padded the buffer out to 32-bit bound, and data
          * xfer direction is from-device, we must copy from the
@@ -2409,7 +2409,8 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
                 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
 
         if (qc->flags & ATA_QCFLAG_SG) {
-                dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
+                if (qc->n_elem)
+                        dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
                 /* restore last sg */
                 sg[qc->orig_n_elem - 1].length += qc->pad_len;
                 if (pad_buf) {
@@ -2419,8 +2420,10 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
                         kunmap_atomic(psg->page, KM_IRQ0);
                 }
         } else {
-                dma_unmap_single(ap->host_set->dev, sg_dma_address(&sg[0]),
-                                 sg_dma_len(&sg[0]), dir);
+                if (sg_dma_len(&sg[0]) > 0)
+                        dma_unmap_single(ap->host_set->dev,
+                                sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
+                                dir);
                 /* restore sg */
                 sg->length += qc->pad_len;
                 if (pad_buf)
@@ -2619,6 +2622,11 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
                         sg->length, qc->pad_len);
         }
 
+        if (!sg->length) {
+                sg_dma_address(sg) = 0;
+                goto skip_map;
+        }
+
         dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
                                      sg->length, dir);
         if (dma_mapping_error(dma_address)) {
@@ -2628,6 +2636,7 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
         }
 
         sg_dma_address(sg) = dma_address;
+skip_map:
         sg_dma_len(sg) = sg->length;
 
         DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
@@ -2655,7 +2664,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
         struct ata_port *ap = qc->ap;
         struct scatterlist *sg = qc->__sg;
         struct scatterlist *lsg = &sg[qc->n_elem - 1];
-        int n_elem, dir;
+        int n_elem, pre_n_elem, dir, trim_sg = 0;
 
         VPRINTK("ENTER, ata%u\n", ap->id);
         assert(qc->flags & ATA_QCFLAG_SG);
@@ -2689,13 +2698,24 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
                 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
                 /* trim last sg */
                 lsg->length -= qc->pad_len;
+                if (lsg->length == 0)
+                        trim_sg = 1;
 
                 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
                         qc->n_elem - 1, lsg->length, qc->pad_len);
         }
 
+        pre_n_elem = qc->n_elem;
+        if (trim_sg && pre_n_elem)
+                pre_n_elem--;
+
+        if (!pre_n_elem) {
+                n_elem = 0;
+                goto skip_map;
+        }
+
         dir = qc->dma_dir;
-        n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir);
+        n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
         if (n_elem < 1) {
                 /* restore last sg */
                 lsg->length += qc->pad_len;
@@ -2704,6 +2724,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
 
         DPRINTK("%d sg elements mapped\n", n_elem);
 
+skip_map:
         qc->n_elem = n_elem;
 
         return 0;
@@ -3263,32 +3284,11 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
 {
         struct ata_port *ap = qc->ap;
         struct ata_host_set *host_set = ap->host_set;
-        struct ata_device *dev = qc->dev;
         u8 host_stat = 0, drv_stat;
         unsigned long flags;
 
         DPRINTK("ENTER\n");
 
-        /* FIXME: doesn't this conflict with timeout handling? */
-        if (qc->dev->class == ATA_DEV_ATAPI && qc->scsicmd) {
-                struct scsi_cmnd *cmd = qc->scsicmd;
-
-                if (!(cmd->eh_eflags & SCSI_EH_CANCEL_CMD)) {
-
-                        /* finish completing original command */
-                        spin_lock_irqsave(&host_set->lock, flags);
-                        __ata_qc_complete(qc);
-                        spin_unlock_irqrestore(&host_set->lock, flags);
-
-                        atapi_request_sense(ap, dev, cmd);
-
-                        cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
-                        scsi_finish_command(cmd);
-
-                        goto out;
-                }
-        }
-
         spin_lock_irqsave(&host_set->lock, flags);
 
         /* hack alert!  We cannot use the supplied completion
@@ -3327,7 +3327,6 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
 
         spin_unlock_irqrestore(&host_set->lock, flags);
 
-out:
         DPRINTK("EXIT\n");
 }
 
@@ -3411,16 +3410,11 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
 
         qc = ata_qc_new(ap);
         if (qc) {
-                qc->__sg = NULL;
-                qc->flags = 0;
                 qc->scsicmd = NULL;
                 qc->ap = ap;
                 qc->dev = dev;
-                qc->cursect = qc->cursg = qc->cursg_ofs = 0;
-                qc->nsect = 0;
-                qc->nbytes = qc->curbytes = 0;
 
-                ata_tf_init(ap, &qc->tf, dev->devno);
+                ata_qc_reinit(qc);
         }
 
         return qc;
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 0df4b682965d..3b4ca55a3332 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1955,22 +1955,44 @@ void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8
         done(cmd);
 }
 
-void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
-                         struct scsi_cmnd *cmd)
+static int atapi_sense_complete(struct ata_queued_cmd *qc,unsigned int err_mask)
 {
-        DECLARE_COMPLETION(wait);
-        struct ata_queued_cmd *qc;
-        unsigned long flags;
-        int rc;
+        if (err_mask && ((err_mask & AC_ERR_DEV) == 0))
+                /* FIXME: not quite right; we don't want the
+                 * translation of taskfile registers into
+                 * a sense descriptors, since that's only
+                 * correct for ATA, not ATAPI
+                 */
+                ata_gen_ata_desc_sense(qc);
 
-        DPRINTK("ATAPI request sense\n");
+        qc->scsidone(qc->scsicmd);
+        return 0;
+}
 
-        qc = ata_qc_new_init(ap, dev);
-        BUG_ON(qc == NULL);
+/* is it pointless to prefer PIO for "safety reasons"? */
+static inline int ata_pio_use_silly(struct ata_port *ap)
+{
+        return (ap->flags & ATA_FLAG_PIO_DMA);
+}
+
+static void atapi_request_sense(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        struct scsi_cmnd *cmd = qc->scsicmd;
+
+        DPRINTK("ATAPI request sense\n");
 
         /* FIXME: is this needed? */
         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
 
+        ap->ops->tf_read(ap, &qc->tf);
+
+        /* fill these in, for the case where they are -not- overwritten */
+        cmd->sense_buffer[0] = 0x70;
+        cmd->sense_buffer[2] = qc->tf.feature >> 4;
+
+        ata_qc_reinit(qc);
+
         ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
         qc->dma_dir = DMA_FROM_DEVICE;
 
@@ -1981,22 +2003,20 @@ void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
         qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
         qc->tf.command = ATA_CMD_PACKET;
 
-        qc->tf.protocol = ATA_PROT_ATAPI;
-        qc->tf.lbam = (8 * 1024) & 0xff;
-        qc->tf.lbah = (8 * 1024) >> 8;
+        if (ata_pio_use_silly(ap)) {
+                qc->tf.protocol = ATA_PROT_ATAPI_DMA;
+                qc->tf.feature |= ATAPI_PKT_DMA;
+        } else {
+                qc->tf.protocol = ATA_PROT_ATAPI;
+                qc->tf.lbam = (8 * 1024) & 0xff;
+                qc->tf.lbah = (8 * 1024) >> 8;
+        }
         qc->nbytes = SCSI_SENSE_BUFFERSIZE;
 
-        qc->waiting = &wait;
-        qc->complete_fn = ata_qc_complete_noop;
+        qc->complete_fn = atapi_sense_complete;
 
-        spin_lock_irqsave(&ap->host_set->lock, flags);
-        rc = ata_qc_issue(qc);
-        spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
-        if (rc)
-                ata_port_disable(ap);
-        else
-                wait_for_completion(&wait);
+        if (ata_qc_issue(qc))
+                ata_qc_complete(qc, AC_ERR_OTHER);
 
         DPRINTK("EXIT\n");
 }
@@ -2008,19 +2028,8 @@ static int atapi_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask)
         VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
 
         if (unlikely(err_mask & AC_ERR_DEV)) {
-                DPRINTK("request check condition\n");
-
-                /* FIXME: command completion with check condition
-                 * but no sense causes the error handler to run,
-                 * which then issues REQUEST SENSE, fills in the sense 
-                 * buffer, and completes the command (for the second
-                 * time).  We need to issue REQUEST SENSE some other
-                 * way, to avoid completing the command twice.
-                 */
                 cmd->result = SAM_STAT_CHECK_CONDITION;
-
-                qc->scsidone(cmd);
-
+                atapi_request_sense(qc);
                 return 1;
         }
 
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index fad051ca4672..74a84e0ec0a4 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -54,8 +54,6 @@ extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
 
 
 /* libata-scsi.c */
-extern void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
-                         struct scsi_cmnd *cmd);
 extern void ata_scsi_scan_host(struct ata_port *ap);
 extern int ata_scsi_error(struct Scsi_Host *host);
 extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,