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

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [libata] ahci: SB600 workaround is suspect... play it safe for now
  sata_promise: fix hardreset hotplug events, take 2
  libata: improve HPA error handling
  libata: assume no device is attached if both IDENTIFYs are aborted
  pata_it821x: use raw nbytes in check_atapi_dma
  libata: implement ata_qc_raw_nbytes()

6 files changed, 140 insertions, 45 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 17ee6ed985d9..b1eb4e24c86a 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -433,6 +433,7 @@ static const struct ata_port_info ahci_port_info[] = {
         /* board_ahci_sb600 */
         {
                 AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL |
+                                 AHCI_HFLAG_32BIT_ONLY |
                                  AHCI_HFLAG_SECT255 | AHCI_HFLAG_NO_PMP),
                 .flags          = AHCI_FLAG_COMMON,
                 .link_flags     = AHCI_LFLAG_COMMON,
@@ -1217,8 +1218,11 @@ static void ahci_dev_config(struct ata_device *dev)
 {
         struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
 
-        if (hpriv->flags & AHCI_HFLAG_SECT255)
+        if (hpriv->flags & AHCI_HFLAG_SECT255) {
                 dev->max_sectors = 255;
+                ata_dev_printk(dev, KERN_INFO,
+                               "SB600 AHCI: limiting to 255 sectors per cmd\n");
+        }
 }
 
 static unsigned int ahci_dev_classify(struct ata_port *ap)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4bbe31f98ef8..c4248b37ff64 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1416,12 +1416,12 @@ static int ata_hpa_resize(struct ata_device *dev)
         /* read native max address */
         rc = ata_read_native_max_address(dev, &native_sectors);
         if (rc) {
-                /* If HPA isn't going to be unlocked, skip HPA
-                 * resizing from the next try.
+                /* If device aborted the command or HPA isn't going to
+                 * be unlocked, skip HPA resizing.
                  */
-                if (!ata_ignore_hpa) {
+                if (rc == -EACCES || !ata_ignore_hpa) {
                         ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
-                                       "broken, will skip HPA handling\n");
+                                       "broken, skipping HPA handling\n");
                         dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
 
                         /* we can continue if device aborted the command */
@@ -2092,24 +2092,34 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
                                      id, sizeof(id[0]) * ATA_ID_WORDS, 0);
         if (err_mask) {
                 if (err_mask & AC_ERR_NODEV_HINT) {
-                        DPRINTK("ata%u.%d: NODEV after polling detection\n",
-                                ap->print_id, dev->devno);
+                        ata_dev_printk(dev, KERN_DEBUG,
+                                       "NODEV after polling detection\n");
                         return -ENOENT;
                 }
 
-                /* Device or controller might have reported the wrong
-                 * device class.  Give a shot at the other IDENTIFY if
-                 * the current one is aborted by the device.
-                 */
-                if (may_fallback &&
-                    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
-                        may_fallback = 0;
+                if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+                        /* Device or controller might have reported
+                         * the wrong device class.  Give a shot at the
+                         * other IDENTIFY if the current one is
+                         * aborted by the device.
+                         */
+                        if (may_fallback) {
+                                may_fallback = 0;
 
-                        if (class == ATA_DEV_ATA)
-                                class = ATA_DEV_ATAPI;
-                        else
-                                class = ATA_DEV_ATA;
-                        goto retry;
+                                if (class == ATA_DEV_ATA)
+                                        class = ATA_DEV_ATAPI;
+                                else
+                                        class = ATA_DEV_ATA;
+                                goto retry;
+                        }
+
+                        /* Control reaches here iff the device aborted
+                         * both flavors of IDENTIFYs which happens
+                         * sometimes with phantom devices.
+                         */
+                        ata_dev_printk(dev, KERN_DEBUG,
+                                       "both IDENTIFYs aborted, assuming NODEV\n");
+                        return -ENOENT;
                 }
 
                 rc = -EIO;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 8f0e8f2bc628..15795394b0a8 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -527,6 +527,14 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
         return qc;
 }
 
+static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
+{
+        struct scsi_cmnd *scmd = qc->scsicmd;
+
+        qc->extrabytes = scmd->request->extra_len;
+        qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
+}
+
 /**
  *      ata_dump_status - user friendly display of error info
  *      @id: id of the port in question
@@ -2539,7 +2547,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
         }
 
         qc->tf.command = ATA_CMD_PACKET;
-        qc->nbytes = scsi_bufflen(scmd) + scmd->request->extra_len;
+        ata_qc_set_pc_nbytes(qc);
 
         /* check whether ATAPI DMA is safe */
         if (!using_pio && ata_check_atapi_dma(qc))
@@ -2550,7 +2558,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
          * want to set it properly, and for DMA where it is
          * effectively meaningless.
          */
-        nbytes = min(scmd->request->data_len, (unsigned int)63 * 1024);
+        nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
 
         /* Most ATAPI devices which honor transfer chunk size don't
          * behave according to the spec when odd chunk size which
@@ -2876,7 +2884,7 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
          * TODO: find out if we need to do more here to
          *       cover scatter/gather case.
          */
-        qc->nbytes = scsi_bufflen(scmd) + scmd->request->extra_len;
+        ata_qc_set_pc_nbytes(qc);
 
         /* request result TF and be quiet about device error */
         qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index 109ddd42c266..257951d03dbb 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -564,7 +564,7 @@ static int it821x_check_atapi_dma(struct ata_queued_cmd *qc)
         struct it821x_dev *itdev = ap->private_data;
 
         /* Only use dma for transfers to/from the media. */
-        if (qc->nbytes < 2048)
+        if (ata_qc_raw_nbytes(qc) < 2048)
                 return -EOPNOTSUPP;
 
         /* No ATAPI DMA in smart mode */
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index f251a5f569d5..11c1afea2db2 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -46,7 +46,7 @@
 #include "sata_promise.h"
 
 #define DRV_NAME        "sata_promise"
-#define DRV_VERSION     "2.11"
+#define DRV_VERSION     "2.12"
 
 enum {
         PDC_MAX_PORTS           = 4,
@@ -145,7 +145,9 @@ static int pdc_old_sata_check_atapi_dma(struct ata_queued_cmd *qc);
 static void pdc_irq_clear(struct ata_port *ap);
 static unsigned int pdc_qc_issue_prot(struct ata_queued_cmd *qc);
 static void pdc_freeze(struct ata_port *ap);
+static void pdc_sata_freeze(struct ata_port *ap);
 static void pdc_thaw(struct ata_port *ap);
+static void pdc_sata_thaw(struct ata_port *ap);
 static void pdc_pata_error_handler(struct ata_port *ap);
 static void pdc_sata_error_handler(struct ata_port *ap);
 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
@@ -180,8 +182,8 @@ static const struct ata_port_operations pdc_sata_ops = {
 
         .qc_prep                = pdc_qc_prep,
         .qc_issue               = pdc_qc_issue_prot,
-        .freeze                 = pdc_freeze,
-        .thaw                   = pdc_thaw,
+        .freeze                 = pdc_sata_freeze,
+        .thaw                   = pdc_sata_thaw,
         .error_handler          = pdc_sata_error_handler,
         .post_internal_cmd      = pdc_post_internal_cmd,
         .cable_detect           = pdc_sata_cable_detect,
@@ -205,8 +207,8 @@ static const struct ata_port_operations pdc_old_sata_ops = {
 
         .qc_prep                = pdc_qc_prep,
         .qc_issue               = pdc_qc_issue_prot,
-        .freeze                 = pdc_freeze,
-        .thaw                   = pdc_thaw,
+        .freeze                 = pdc_sata_freeze,
+        .thaw                   = pdc_sata_thaw,
         .error_handler          = pdc_sata_error_handler,
         .post_internal_cmd      = pdc_post_internal_cmd,
         .cable_detect           = pdc_sata_cable_detect,
@@ -631,6 +633,41 @@ static void pdc_qc_prep(struct ata_queued_cmd *qc)
         }
 }
 
+static int pdc_is_sataii_tx4(unsigned long flags)
+{
+        const unsigned long mask = PDC_FLAG_GEN_II | PDC_FLAG_4_PORTS;
+        return (flags & mask) == mask;
+}
+
+static unsigned int pdc_port_no_to_ata_no(unsigned int port_no,
+                                          int is_sataii_tx4)
+{
+        static const unsigned char sataii_tx4_port_remap[4] = { 3, 1, 0, 2};
+        return is_sataii_tx4 ? sataii_tx4_port_remap[port_no] : port_no;
+}
+
+static unsigned int pdc_sata_nr_ports(const struct ata_port *ap)
+{
+        return (ap->flags & PDC_FLAG_4_PORTS) ? 4 : 2;
+}
+
+static unsigned int pdc_sata_ata_port_to_ata_no(const struct ata_port *ap)
+{
+        const struct ata_host *host = ap->host;
+        unsigned int nr_ports = pdc_sata_nr_ports(ap);
+        unsigned int i;
+
+        for(i = 0; i < nr_ports && host->ports[i] != ap; ++i)
+                ;
+        BUG_ON(i >= nr_ports);
+        return pdc_port_no_to_ata_no(i, pdc_is_sataii_tx4(ap->flags));
+}
+
+static unsigned int pdc_sata_hotplug_offset(const struct ata_port *ap)
+{
+        return (ap->flags & PDC_FLAG_GEN_II) ? PDC2_SATA_PLUG_CSR : PDC_SATA_PLUG_CSR;
+}
+
 static void pdc_freeze(struct ata_port *ap)
 {
         void __iomem *mmio = ap->ioaddr.cmd_addr;
@@ -643,6 +680,29 @@ static void pdc_freeze(struct ata_port *ap)
         readl(mmio + PDC_CTLSTAT); /* flush */
 }
 
+static void pdc_sata_freeze(struct ata_port *ap)
+{
+        struct ata_host *host = ap->host;
+        void __iomem *host_mmio = host->iomap[PDC_MMIO_BAR];
+        unsigned int hotplug_offset = pdc_sata_hotplug_offset(ap);
+        unsigned int ata_no = pdc_sata_ata_port_to_ata_no(ap);
+        u32 hotplug_status;
+
+        /* Disable hotplug events on this port.
+         *
+         * Locking:
+         * 1) hotplug register accesses must be serialised via host->lock
+         * 2) ap->lock == &ap->host->lock
+         * 3) ->freeze() and ->thaw() are called with ap->lock held
+         */
+        hotplug_status = readl(host_mmio + hotplug_offset);
+        hotplug_status |= 0x11 << (ata_no + 16);
+        writel(hotplug_status, host_mmio + hotplug_offset);
+        readl(host_mmio + hotplug_offset); /* flush */
+
+        pdc_freeze(ap);
+}
+
 static void pdc_thaw(struct ata_port *ap)
 {
         void __iomem *mmio = ap->ioaddr.cmd_addr;
@@ -658,6 +718,26 @@ static void pdc_thaw(struct ata_port *ap)
         readl(mmio + PDC_CTLSTAT); /* flush */
 }
 
+static void pdc_sata_thaw(struct ata_port *ap)
+{
+        struct ata_host *host = ap->host;
+        void __iomem *host_mmio = host->iomap[PDC_MMIO_BAR];
+        unsigned int hotplug_offset = pdc_sata_hotplug_offset(ap);
+        unsigned int ata_no = pdc_sata_ata_port_to_ata_no(ap);
+        u32 hotplug_status;
+
+        pdc_thaw(ap);
+
+        /* Enable hotplug events on this port.
+         * Locking: see pdc_sata_freeze().
+         */
+        hotplug_status = readl(host_mmio + hotplug_offset);
+        hotplug_status |= 0x11 << ata_no;
+        hotplug_status &= ~(0x11 << (ata_no + 16));
+        writel(hotplug_status, host_mmio + hotplug_offset);
+        readl(host_mmio + hotplug_offset); /* flush */
+}
+
 static void pdc_common_error_handler(struct ata_port *ap, ata_reset_fn_t hardreset)
 {
         if (!(ap->pflags & ATA_PFLAG_FROZEN))
@@ -765,19 +845,6 @@ static void pdc_irq_clear(struct ata_port *ap)
         readl(mmio + PDC_INT_SEQMASK);
 }
 
-static int pdc_is_sataii_tx4(unsigned long flags)
-{
-        const unsigned long mask = PDC_FLAG_GEN_II | PDC_FLAG_4_PORTS;
-        return (flags & mask) == mask;
-}
-
-static unsigned int pdc_port_no_to_ata_no(unsigned int port_no,
-                                          int is_sataii_tx4)
-{
-        static const unsigned char sataii_tx4_port_remap[4] = { 3, 1, 0, 2};
-        return is_sataii_tx4 ? sataii_tx4_port_remap[port_no] : port_no;
-}
-
 static irqreturn_t pdc_interrupt(int irq, void *dev_instance)
 {
         struct ata_host *host = dev_instance;
@@ -799,6 +866,8 @@ static irqreturn_t pdc_interrupt(int irq, void *dev_instance)
 
         mmio_base = host->iomap[PDC_MMIO_BAR];
 
+        spin_lock(&host->lock);
+
         /* read and clear hotplug flags for all ports */
         if (host->ports[0]->flags & PDC_FLAG_GEN_II)
                 hotplug_offset = PDC2_SATA_PLUG_CSR;
@@ -814,11 +883,9 @@ static irqreturn_t pdc_interrupt(int irq, void *dev_instance)
 
         if (mask == 0xffffffff && hotplug_status == 0) {
                 VPRINTK("QUICK EXIT 2\n");
-                return IRQ_NONE;
+                goto done_irq;
         }
 
-        spin_lock(&host->lock);
-
         mask &= 0xffff;         /* only 16 tags possible */
         if (mask == 0 && hotplug_status == 0) {
                 VPRINTK("QUICK EXIT 3\n");
diff --git a/include/linux/libata.h b/include/linux/libata.h
index a05f60013642..269cdba09578 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -463,6 +463,7 @@ struct ata_queued_cmd {
         unsigned int            sect_size;
 
         unsigned int            nbytes;
+        unsigned int            extrabytes;
         unsigned int            curbytes;
 
         struct scatterlist      *cursg;
@@ -1336,6 +1337,11 @@ static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
         return NULL;
 }
 
+static inline unsigned int ata_qc_raw_nbytes(struct ata_queued_cmd *qc)
+{
+        return qc->nbytes - min(qc->extrabytes, qc->nbytes);
+}
+
 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
 {
         memset(tf, 0, sizeof(*tf));
@@ -1354,7 +1360,7 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
         qc->flags = 0;
         qc->cursg = NULL;
         qc->cursg_ofs = 0;
-        qc->nbytes = qc->curbytes = 0;
+        qc->nbytes = qc->extrabytes = qc->curbytes = 0;
         qc->n_elem = 0;
         qc->err_mask = 0;
         qc->sect_size = ATA_SECT_SIZE;