[SCSI] Add SATA support to libsas
Hook the scsi_host_template functions in libsas to delegate
functionality to libata when appropriate.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Misc code changes and merge fixes and update for libata->drivers/ata
move
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 9c5342e..3220b3f 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -42,6 +42,7 @@
#include <linux/blkdev.h>
#include <linux/freezer.h>
#include <linux/scatterlist.h>
+#include <linux/libata.h>
/* ---------- SCSI Host glue ---------- */
@@ -192,6 +193,11 @@
return 0;
}
+static inline int dev_is_sata(struct domain_device *dev)
+{
+ return (dev->rphy->identify.target_port_protocols & SAS_PROTOCOL_SATA);
+}
+
/**
* sas_queuecommand -- Enqueue a command for processing
* @parameters: See SCSI Core documentation
@@ -213,6 +219,12 @@
struct sas_ha_struct *sas_ha = dev->port->ha;
struct sas_task *task;
+ if (dev_is_sata(dev)) {
+ res = ata_sas_queuecmd(cmd, scsi_done,
+ dev->sata_dev.ap);
+ goto out;
+ }
+
res = -ENOMEM;
task = sas_create_task(cmd, dev, GFP_ATOMIC);
if (!task)
@@ -684,6 +696,279 @@
return EH_NOT_HANDLED;
}
+
+static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
+{
+ /* Cheesy attempt to translate SAS errors into ATA. Hah! */
+
+ /* transport error */
+ if (ts->resp == SAS_TASK_UNDELIVERED)
+ return AC_ERR_ATA_BUS;
+
+ /* ts->resp == SAS_TASK_COMPLETE */
+ /* task delivered, what happened afterwards? */
+ switch (ts->stat) {
+ case SAS_DEV_NO_RESPONSE:
+ return AC_ERR_TIMEOUT;
+
+ case SAS_INTERRUPTED:
+ case SAS_PHY_DOWN:
+ case SAS_NAK_R_ERR:
+ return AC_ERR_ATA_BUS;
+
+
+ case SAS_DATA_UNDERRUN:
+ /*
+ * Some programs that use the taskfile interface
+ * (smartctl in particular) can cause underrun
+ * problems. Ignore these errors, perhaps at our
+ * peril.
+ */
+ return 0;
+
+ case SAS_DATA_OVERRUN:
+ case SAS_QUEUE_FULL:
+ case SAS_DEVICE_UNKNOWN:
+ case SAS_SG_ERR:
+ return AC_ERR_INVALID;
+
+ case SAM_CHECK_COND:
+ case SAS_OPEN_TO:
+ case SAS_OPEN_REJECT:
+ case SAS_PROTO_RESPONSE:
+ SAS_DPRINTK("%s: Saw error %d. What to do?\n",
+ __FUNCTION__, ts->stat);
+ return AC_ERR_OTHER;
+
+ case SAS_ABORTED_TASK:
+ return AC_ERR_DEV;
+
+ default:
+ return 0;
+ }
+}
+
+static void sas_ata_task_done(struct sas_task *task)
+{
+ struct ata_queued_cmd *qc = task->uldd_task;
+ struct domain_device *dev = qc->ap->private_data;
+ struct task_status_struct *stat = &task->task_status;
+ struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
+ enum ata_completion_errors ac;
+
+ ac = sas_to_ata_err(stat);
+ if (ac) {
+ SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__, stat->stat);
+ /* We saw a SAS error. Send a vague error. */
+ qc->err_mask = ac;
+ dev->sata_dev.tf.feature = 0x04; /* status err */
+ dev->sata_dev.tf.command = ATA_ERR;
+ goto end;
+ }
+
+ ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
+ qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
+ dev->sata_dev.sstatus = resp->sstatus;
+ dev->sata_dev.serror = resp->serror;
+ dev->sata_dev.scontrol = resp->scontrol;
+ dev->sata_dev.ap->sactive = resp->sactive;
+end:
+ ata_qc_complete(qc);
+ list_del_init(&task->list);
+ sas_free_task(task);
+}
+
+int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+{
+ struct domain_device *dev = sdev_to_domain_dev(sdev);
+
+ if (dev_is_sata(dev))
+ return ata_scsi_ioctl(sdev, cmd, arg);
+
+ return -EINVAL;
+}
+
+static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
+{
+ int res = -ENOMEM;
+ struct sas_task *task;
+ struct domain_device *dev = qc->ap->private_data;
+ struct sas_ha_struct *sas_ha = dev->port->ha;
+ struct Scsi_Host *host = sas_ha->core.shost;
+ struct sas_internal *i = to_sas_internal(host->transportt);
+ struct scatterlist *sg;
+ unsigned int num = 0;
+ unsigned int xfer = 0;
+
+ task = sas_alloc_task(GFP_ATOMIC);
+ if (!task)
+ goto out;
+ task->dev = dev;
+ task->task_proto = SAS_PROTOCOL_STP;
+ task->task_done = sas_ata_task_done;
+
+ ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
+ task->uldd_task = qc;
+ if (is_atapi_taskfile(&qc->tf)) {
+ memcpy(task->ata_task.atapi_packet, qc->cdb, ATAPI_CDB_LEN);
+ task->total_xfer_len = qc->nbytes + qc->pad_len;
+ task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
+ } else {
+ ata_for_each_sg(sg, qc) {
+ num++;
+ xfer += sg->length;
+ }
+
+ task->total_xfer_len = xfer;
+ task->num_scatter = num;
+ }
+
+ task->data_dir = qc->dma_dir;
+ task->scatter = qc->__sg;
+ task->ata_task.retry_count = 1;
+ task->task_state_flags = SAS_TASK_STATE_PENDING;
+
+ if (qc->tf.protocol == ATA_PROT_DMA)
+ task->ata_task.dma_xfer = 1;
+
+ if (sas_ha->lldd_max_execute_num < 2)
+ res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
+ else
+ res = sas_queue_up(task);
+
+ /* Examine */
+ if (res) {
+ SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
+
+ sas_free_task(task);
+ if (res == -SAS_QUEUE_FULL)
+ return -ENOMEM;
+ }
+
+out:
+ return res;
+}
+
+static u8 sas_ata_check_status(struct ata_port *ap)
+{
+ struct domain_device *dev = ap->private_data;
+ return dev->sata_dev.tf.command;
+}
+
+static void sas_ata_phy_reset(struct ata_port *ap)
+{
+ struct domain_device *dev = ap->private_data;
+ struct sas_internal *i =
+ to_sas_internal(dev->port->ha->core.shost->transportt);
+ int res = 0;
+
+ if (i->dft->lldd_I_T_nexus_reset)
+ res = i->dft->lldd_I_T_nexus_reset(dev);
+
+ if (res)
+ SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);
+
+ switch (dev->sata_dev.command_set) {
+ case ATA_COMMAND_SET:
+ SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
+ ap->device[0].class = ATA_DEV_ATA;
+ break;
+ case ATAPI_COMMAND_SET:
+ SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
+ ap->device[0].class = ATA_DEV_ATAPI;
+ break;
+ default:
+ SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
+ __FUNCTION__,
+ dev->sata_dev.command_set);
+ ap->device[0].class = ATA_DEV_ATA;
+ break;
+ }
+
+ ap->cbl = ATA_CBL_SATA;
+}
+
+static void sas_ata_post_internal(struct ata_queued_cmd *qc)
+{
+ if (qc->flags & ATA_QCFLAG_FAILED)
+ qc->err_mask |= AC_ERR_OTHER;
+
+ if (qc->err_mask)
+ SAS_DPRINTK("%s: Failure; reset phy!\n", __FUNCTION__);
+}
+
+static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+ struct domain_device *dev = ap->private_data;
+ memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
+}
+
+static void sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
+ u32 val)
+{
+ struct domain_device *dev = ap->private_data;
+
+ SAS_DPRINTK("STUB %s\n", __FUNCTION__);
+ switch (sc_reg_in) {
+ case SCR_STATUS:
+ dev->sata_dev.sstatus = val;
+ break;
+ case SCR_CONTROL:
+ dev->sata_dev.scontrol = val;
+ break;
+ case SCR_ERROR:
+ dev->sata_dev.serror = val;
+ break;
+ case SCR_ACTIVE:
+ dev->sata_dev.ap->sactive = val;
+ break;
+ }
+}
+
+static u32 sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
+{
+ struct domain_device *dev = ap->private_data;
+
+ SAS_DPRINTK("STUB %s\n", __FUNCTION__);
+ switch (sc_reg_in) {
+ case SCR_STATUS:
+ return dev->sata_dev.sstatus;
+ case SCR_CONTROL:
+ return dev->sata_dev.scontrol;
+ case SCR_ERROR:
+ return dev->sata_dev.serror;
+ case SCR_ACTIVE:
+ return dev->sata_dev.ap->sactive;
+ default:
+ return 0xffffffffU;
+ }
+}
+
+static struct ata_port_operations sas_sata_ops = {
+ .port_disable = ata_port_disable,
+ .check_status = sas_ata_check_status,
+ .check_altstatus = sas_ata_check_status,
+ .dev_select = ata_noop_dev_select,
+ .phy_reset = sas_ata_phy_reset,
+ .post_internal_cmd = sas_ata_post_internal,
+ .tf_read = sas_ata_tf_read,
+ .qc_prep = ata_noop_qc_prep,
+ .qc_issue = sas_ata_qc_issue,
+ .port_start = ata_sas_port_start,
+ .port_stop = ata_sas_port_stop,
+ .scr_read = sas_ata_scr_read,
+ .scr_write = sas_ata_scr_write
+};
+
+static struct ata_port_info sata_port_info = {
+ .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
+ ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
+ .pio_mask = 0x1f, /* PIO0-4 */
+ .mwdma_mask = 0x07, /* MWDMA0-2 */
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &sas_sata_ops
+};
+
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
{
struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
@@ -722,11 +1007,33 @@
int sas_target_alloc(struct scsi_target *starget)
{
+ struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
struct domain_device *found_dev = sas_find_target(starget);
if (!found_dev)
return -ENODEV;
+ if (dev_is_sata(found_dev)) {
+ struct ata_port *ap;
+
+ ata_host_init(&found_dev->sata_dev.ata_host,
+ &ha->pcidev->dev,
+ sata_port_info.flags,
+ &sas_sata_ops);
+ ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
+ &sata_port_info,
+ shost);
+ if (!ap) {
+ SAS_DPRINTK("ata_sas_port_alloc failed.\n");
+ return -ENODEV;
+ }
+
+ ap->private_data = found_dev;
+ ap->cbl = ATA_CBL_SATA;
+ found_dev->sata_dev.ap = ap;
+ }
+
starget->hostdata = found_dev;
return 0;
}
@@ -741,6 +1048,11 @@
BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
+ if (dev_is_sata(dev)) {
+ ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
+ return 0;
+ }
+
sas_ha = dev->port->ha;
sas_read_port_mode_page(scsi_dev);
@@ -764,6 +1076,10 @@
void sas_slave_destroy(struct scsi_device *scsi_dev)
{
+ struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
+
+ if (dev_is_sata(dev))
+ ata_port_disable(dev->sata_dev.ap);
}
int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
@@ -984,6 +1300,29 @@
scsi_schedule_eh(sc->device->host);
}
+int sas_slave_alloc(struct scsi_device *scsi_dev)
+{
+ struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
+
+ if (dev_is_sata(dev))
+ return ata_sas_port_init(dev->sata_dev.ap);
+
+ return 0;
+}
+
+void sas_target_destroy(struct scsi_target *starget)
+{
+ struct domain_device *found_dev = sas_find_target(starget);
+
+ if (!found_dev)
+ return;
+
+ if (dev_is_sata(found_dev))
+ ata_sas_port_destroy(found_dev->sata_dev.ap);
+
+ return;
+}
+
EXPORT_SYMBOL_GPL(sas_queuecommand);
EXPORT_SYMBOL_GPL(sas_target_alloc);
EXPORT_SYMBOL_GPL(sas_slave_configure);
@@ -997,3 +1336,6 @@
EXPORT_SYMBOL_GPL(sas_phy_enable);
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
+EXPORT_SYMBOL_GPL(sas_slave_alloc);
+EXPORT_SYMBOL_GPL(sas_target_destroy);
+EXPORT_SYMBOL_GPL(sas_ioctl);