[SCSI] libsas: use ->set_dmamode to notify lldds of NCQ parameters
Dan Williams [Fri, 18 Nov 2011 01:59:52 +0000 (17:59 -0800)]
sas_discover_sata() notifies lldds of sata devices twice.  Once to allow
the 'identify' to be sent, and a second time to allow aic94xx (the only
libsas driver that cares about sata_dev.identify) to setup NCQ
parameters before the device becomes known to the midlayer.  Replace
this double notification and intervening 'identify' with an explicit
->lldd_ata_set_dmamode notification.  With this change all ata internal
commands are issued by libata, so we no longer need sas_issue_ata_cmd().

The data from the identify command only needs to be cached in one
location so ata_device.id replaces domain_device.sata_dev.identify.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/aic94xx/aic94xx.h
drivers/scsi/aic94xx/aic94xx_dev.c
drivers/scsi/aic94xx/aic94xx_init.c
drivers/scsi/libsas/sas_ata.c
drivers/scsi/libsas/sas_discover.c
include/scsi/libsas.h

index 2863a9d..66cda66 100644 (file)
@@ -80,6 +80,8 @@ void asd_invalidate_edb(struct asd_ascb *ascb, int edb_id);
 
 int  asd_execute_task(struct sas_task *, int num, gfp_t gfp_flags);
 
+void asd_set_dmamode(struct domain_device *dev);
+
 /* ---------- TMFs ---------- */
 int  asd_abort_task(struct sas_task *);
 int  asd_abort_task_set(struct domain_device *, u8 *lun);
index 2e2ddec..64136c5 100644 (file)
@@ -109,26 +109,37 @@ static int asd_init_sata_tag_ddb(struct domain_device *dev)
        return 0;
 }
 
-static int asd_init_sata(struct domain_device *dev)
+void asd_set_dmamode(struct domain_device *dev)
 {
        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+       struct ata_device *ata_dev = sas_to_ata_dev(dev);
        int ddb = (int) (unsigned long) dev->lldd_dev;
        u32 qdepth = 0;
-       int res = 0;
 
-       asd_ddbsite_write_word(asd_ha, ddb, ATA_CMD_SCBPTR, 0xFFFF);
-       if ((dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT) &&
-           dev->sata_dev.identify_device &&
-           dev->sata_dev.identify_device[10] != 0) {
-               u16 w75 = le16_to_cpu(dev->sata_dev.identify_device[75]);
-               u16 w76 = le16_to_cpu(dev->sata_dev.identify_device[76]);
-
-               if (w76 & 0x100) /* NCQ? */
-                       qdepth = (w75 & 0x1F) + 1;
+       if (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT) {
+               if (ata_id_has_ncq(ata_dev->id))
+                       qdepth = ata_id_queue_depth(ata_dev->id);
                asd_ddbsite_write_dword(asd_ha, ddb, SATA_TAG_ALLOC_MASK,
                                        (1ULL<<qdepth)-1);
                asd_ddbsite_write_byte(asd_ha, ddb, NUM_SATA_TAGS, qdepth);
        }
+
+       if (qdepth > 0)
+               if (asd_init_sata_tag_ddb(dev) != 0) {
+                       unsigned long flags;
+
+                       spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
+                       ata_dev->flags |= ATA_DFLAG_NCQ_OFF;
+                       spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
+               }
+}
+
+static int asd_init_sata(struct domain_device *dev)
+{
+       struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+       int ddb = (int) (unsigned long) dev->lldd_dev;
+
+       asd_ddbsite_write_word(asd_ha, ddb, ATA_CMD_SCBPTR, 0xFFFF);
        if (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM ||
            dev->dev_type == SATA_PM_PORT) {
                struct dev_to_host_fis *fis = (struct dev_to_host_fis *)
@@ -136,9 +147,8 @@ static int asd_init_sata(struct domain_device *dev)
                asd_ddbsite_write_byte(asd_ha, ddb, SATA_STATUS, fis->status);
        }
        asd_ddbsite_write_word(asd_ha, ddb, NCQ_DATA_SCB_PTR, 0xFFFF);
-       if (qdepth > 0)
-               res = asd_init_sata_tag_ddb(dev);
-       return res;
+
+       return 0;
 }
 
 static int asd_init_target_ddb(struct domain_device *dev)
index 2b3717f..eea988a 100644 (file)
@@ -1009,6 +1009,8 @@ static struct sas_domain_function_template aic94xx_transport_functions = {
        .lldd_clear_nexus_ha    = asd_clear_nexus_ha,
 
        .lldd_control_phy       = asd_control_phy,
+
+       .lldd_ata_set_dmamode   = asd_set_dmamode,
 };
 
 static const struct pci_device_id aic94xx_pci_table[] __devinitdata = {
index 4b6365c..71af919 100644 (file)
@@ -367,6 +367,17 @@ static void sas_ata_post_internal(struct ata_queued_cmd *qc)
        }
 }
 
+
+static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
+{
+       struct domain_device *dev = ap->private_data;
+       struct sas_internal *i =
+               to_sas_internal(dev->port->ha->core.shost->transportt);
+
+       if (i->dft->lldd_ata_set_dmamode)
+               i->dft->lldd_ata_set_dmamode(dev);
+}
+
 static struct ata_port_operations sas_sata_ops = {
        .prereset               = ata_std_prereset,
        .softreset              = sas_ata_soft_reset,
@@ -380,6 +391,7 @@ static struct ata_port_operations sas_sata_ops = {
        .qc_fill_rtf            = sas_ata_qc_fill_rtf,
        .port_start             = ata_sas_port_start,
        .port_stop              = ata_sas_port_stop,
+       .set_dmamode            = sas_ata_set_dmamode,
 };
 
 static struct ata_port_info sata_port_info = {
@@ -442,163 +454,6 @@ void sas_ata_task_abort(struct sas_task *task)
        complete(waiting);
 }
 
-static void sas_task_timedout(unsigned long _task)
-{
-       struct sas_task *task = (void *) _task;
-       unsigned long flags;
-
-       spin_lock_irqsave(&task->task_state_lock, flags);
-       if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
-               task->task_state_flags |= SAS_TASK_STATE_ABORTED;
-       spin_unlock_irqrestore(&task->task_state_lock, flags);
-
-       complete(&task->completion);
-}
-
-static void sas_disc_task_done(struct sas_task *task)
-{
-       if (!del_timer(&task->timer))
-               return;
-       complete(&task->completion);
-}
-
-#define SAS_DEV_TIMEOUT 10
-
-/**
- * sas_execute_task -- Basic task processing for discovery
- * @task: the task to be executed
- * @buffer: pointer to buffer to do I/O
- * @size: size of @buffer
- * @dma_dir: DMA direction.  DMA_xxx
- */
-static int sas_execute_task(struct sas_task *task, void *buffer, int size,
-                           enum dma_data_direction dma_dir)
-{
-       int res = 0;
-       struct scatterlist *scatter = NULL;
-       struct task_status_struct *ts = &task->task_status;
-       int num_scatter = 0;
-       int retries = 0;
-       struct sas_internal *i =
-               to_sas_internal(task->dev->port->ha->core.shost->transportt);
-
-       if (dma_dir != DMA_NONE) {
-               scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
-               if (!scatter)
-                       goto out;
-
-               sg_init_one(scatter, buffer, size);
-               num_scatter = 1;
-       }
-
-       task->task_proto = task->dev->tproto;
-       task->scatter = scatter;
-       task->num_scatter = num_scatter;
-       task->total_xfer_len = size;
-       task->data_dir = dma_dir;
-       task->task_done = sas_disc_task_done;
-       if (dma_dir != DMA_NONE &&
-           sas_protocol_ata(task->task_proto)) {
-               task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
-                                              task->scatter,
-                                              task->num_scatter,
-                                              task->data_dir);
-       }
-
-       for (retries = 0; retries < 5; retries++) {
-               task->task_state_flags = SAS_TASK_STATE_PENDING;
-               init_completion(&task->completion);
-
-               task->timer.data = (unsigned long) task;
-               task->timer.function = sas_task_timedout;
-               task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
-               add_timer(&task->timer);
-
-               res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
-               if (res) {
-                       del_timer(&task->timer);
-                       SAS_DPRINTK("executing SAS discovery task failed:%d\n",
-                                   res);
-                       goto ex_err;
-               }
-               wait_for_completion(&task->completion);
-               res = -ECOMM;
-               if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
-                       int res2;
-                       SAS_DPRINTK("task aborted, flags:0x%x\n",
-                                   task->task_state_flags);
-                       res2 = i->dft->lldd_abort_task(task);
-                       SAS_DPRINTK("came back from abort task\n");
-                       if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
-                               if (res2 == TMF_RESP_FUNC_COMPLETE)
-                                       continue; /* Retry the task */
-                               else
-                                       goto ex_err;
-                       }
-               }
-               if (task->task_status.stat == SAM_STAT_BUSY ||
-                          task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
-                          task->task_status.stat == SAS_QUEUE_FULL) {
-                       SAS_DPRINTK("task: q busy, sleeping...\n");
-                       schedule_timeout_interruptible(HZ);
-               } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
-                       struct scsi_sense_hdr shdr;
-
-                       if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
-                                                 &shdr)) {
-                               SAS_DPRINTK("couldn't normalize sense\n");
-                               continue;
-                       }
-                       if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
-                           (shdr.sense_key == 2 && shdr.asc == 4 &&
-                            shdr.ascq == 1)) {
-                               SAS_DPRINTK("device %016llx LUN: %016llx "
-                                           "powering up or not ready yet, "
-                                           "sleeping...\n",
-                                           SAS_ADDR(task->dev->sas_addr),
-                                           SAS_ADDR(task->ssp_task.LUN));
-
-                               schedule_timeout_interruptible(5*HZ);
-                       } else if (shdr.sense_key == 1) {
-                               res = 0;
-                               break;
-                       } else if (shdr.sense_key == 5) {
-                               break;
-                       } else {
-                               SAS_DPRINTK("dev %016llx LUN: %016llx "
-                                           "sense key:0x%x ASC:0x%x ASCQ:0x%x"
-                                           "\n",
-                                           SAS_ADDR(task->dev->sas_addr),
-                                           SAS_ADDR(task->ssp_task.LUN),
-                                           shdr.sense_key,
-                                           shdr.asc, shdr.ascq);
-                       }
-               } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
-                          task->task_status.stat != SAM_STAT_GOOD) {
-                       SAS_DPRINTK("task finished with resp:0x%x, "
-                                   "stat:0x%x\n",
-                                   task->task_status.resp,
-                                   task->task_status.stat);
-                       goto ex_err;
-               } else {
-                       res = 0;
-                       break;
-               }
-       }
-ex_err:
-       if (dma_dir != DMA_NONE) {
-               if (sas_protocol_ata(task->task_proto))
-                       dma_unmap_sg(task->dev->port->ha->dev,
-                                    task->scatter, task->num_scatter,
-                                    task->data_dir);
-               kfree(scatter);
-       }
-out:
-       return res;
-}
-
-/* ---------- SATA ---------- */
-
 static void sas_get_ata_command_set(struct domain_device *dev)
 {
        struct dev_to_host_fis *fis =
@@ -642,122 +497,6 @@ static void sas_get_ata_command_set(struct domain_device *dev)
                dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 }
 
-/**
- * sas_issue_ata_cmd -- Basic SATA command processing for discovery
- * @dev: the device to send the command to
- * @command: the command register
- * @features: the features register
- * @buffer: pointer to buffer to do I/O
- * @size: size of @buffer
- * @dma_dir: DMA direction.  DMA_xxx
- */
-static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
-                            u8 features, void *buffer, int size,
-                            enum dma_data_direction dma_dir)
-{
-       int res = 0;
-       struct sas_task *task;
-       struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
-               &dev->frame_rcvd[0];
-
-       res = -ENOMEM;
-       task = sas_alloc_task(GFP_KERNEL);
-       if (!task)
-               goto out;
-
-       task->dev = dev;
-
-       task->ata_task.fis.fis_type = 0x27;
-       task->ata_task.fis.command = command;
-       task->ata_task.fis.features = features;
-       task->ata_task.fis.device = d2h_fis->device;
-       task->ata_task.retry_count = 1;
-
-       res = sas_execute_task(task, buffer, size, dma_dir);
-
-       sas_free_task(task);
-out:
-       return res;
-}
-
-#define ATA_IDENTIFY_DEV         0xEC
-#define ATA_IDENTIFY_PACKET_DEV  0xA1
-#define ATA_SET_FEATURES         0xEF
-#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
-
-/**
- * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
- * @dev: STP/SATA device of interest (ATA/ATAPI)
- *
- * The LLDD has already been notified of this device, so that we can
- * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
- * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
- * performance for this device.
- */
-static int sas_discover_sata_dev(struct domain_device *dev)
-{
-       int     res;
-       __le16  *identify_x;
-       u8      command;
-
-       identify_x = kzalloc(512, GFP_KERNEL);
-       if (!identify_x)
-               return -ENOMEM;
-
-       if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
-               dev->sata_dev.identify_device = identify_x;
-               command = ATA_IDENTIFY_DEV;
-       } else {
-               dev->sata_dev.identify_packet_device = identify_x;
-               command = ATA_IDENTIFY_PACKET_DEV;
-       }
-
-       res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
-                               DMA_FROM_DEVICE);
-       if (res)
-               goto out_err;
-
-       /* lives on the media? */
-       if (le16_to_cpu(identify_x[0]) & 4) {
-               /* incomplete response */
-               SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
-                           "dev %llx\n", SAS_ADDR(dev->sas_addr));
-               if (!(identify_x[83] & cpu_to_le16(1<<6)))
-                       goto cont1;
-               res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
-                                       ATA_FEATURE_PUP_STBY_SPIN_UP,
-                                       NULL, 0, DMA_NONE);
-               if (res)
-                       goto cont1;
-
-               schedule_timeout_interruptible(5*HZ); /* More time? */
-               res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
-                                       DMA_FROM_DEVICE);
-               if (res)
-                       goto out_err;
-       }
-cont1:
-       /* XXX Hint: register this SATA device with SATL.
-          When this returns, dev->sata_dev->lu is alive and
-          present.
-       sas_satl_register_dev(dev);
-       */
-
-       sas_fill_in_rphy(dev, dev->rphy);
-
-       return 0;
-out_err:
-       dev->sata_dev.identify_packet_device = NULL;
-       dev->sata_dev.identify_device = NULL;
-       kfree(identify_x);
-       return res;
-}
-
-static int sas_discover_sata_pm(struct domain_device *dev)
-{
-       return -ENODEV;
-}
-
 void sas_probe_sata(struct work_struct *work)
 {
        struct domain_device *dev, *n;
@@ -791,49 +530,26 @@ void sas_probe_sata(struct work_struct *work)
  * sas_discover_sata -- discover an STP/SATA domain device
  * @dev: pointer to struct domain_device of interest
  *
- * First we notify the LLDD of this device, so we can send frames to
- * it.  Then depending on the type of device we call the appropriate
- * discover functions.  Once device discover is done, we notify the
- * LLDD so that it can fine-tune its parameters for the device, by
- * removing it and then adding it.  That is, the second time around,
- * the driver would have certain fields, that it is looking at, set.
- * Finally we initialize the kobj so that the device can be added to
- * the system at registration time.  Devices directly attached to a HA
- * port, have no parents.  All other devices do, and should have their
- * "parent" pointer set appropriately before calling this function.
+ * Devices directly attached to a HA port, have no parents.  All other
+ * devices do, and should have their "parent" pointer set appropriately
+ * before calling this function.
  */
 int sas_discover_sata(struct domain_device *dev)
 {
        int res;
 
-       sas_get_ata_command_set(dev);
-
-       res = sas_notify_lldd_dev_found(dev);
-       if (res)
-               return res;
-
-       switch (dev->dev_type) {
-       case SATA_DEV:
-               res = sas_discover_sata_dev(dev);
-               break;
-       case SATA_PM:
-               res = sas_discover_sata_pm(dev);
-               break;
-       default:
-               break;
-       }
-       sas_notify_lldd_dev_gone(dev);
+       if (dev->dev_type == SATA_PM)
+               return -ENODEV;
 
-       if (res)
-               return res;
+       sas_get_ata_command_set(dev);
+       sas_fill_in_rphy(dev, dev->rphy);
 
        res = sas_notify_lldd_dev_found(dev);
        if (res)
                return res;
 
        sas_discover_event(dev->port, DISCE_PROBE);
-
-       return res;
+       return 0;
 }
 
 void sas_ata_strategy_handler(struct Scsi_Host *shost)
index 7e8fdcb..bad5eba 100644 (file)
@@ -237,11 +237,6 @@ void sas_free_device(struct kref *kref)
        if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
                kfree(dev->ex_dev.ex_phy);
 
-       if (dev_is_sata(dev)) {
-               kfree(dev->sata_dev.identify_device);
-               kfree(dev->sata_dev.identify_packet_device);
-       }
-
        kfree(dev);
 }
 
index bd6e89e..9c13a5c 100644 (file)
@@ -164,9 +164,6 @@ enum ata_command_set {
 struct sata_device {
         enum   ata_command_set command_set;
         struct smp_resp        rps_resp; /* report_phy_sata_resp */
-        __le16 *identify_device;
-        __le16 *identify_packet_device;
-
         u8     port_no;        /* port number, if this is a PM (Port) */
         struct list_head children; /* PM Ports if this is a PM */
 
@@ -609,6 +606,7 @@ struct sas_domain_function_template {
        int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
        int (*lldd_I_T_nexus_reset)(struct domain_device *);
        int (*lldd_ata_soft_reset)(struct domain_device *);
+       void (*lldd_ata_set_dmamode)(struct domain_device *);
        int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
        int (*lldd_query_task)(struct sas_task *);