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-rw-r--r--drivers/scsi/libsas/sas_ata.c817
1 files changed, 817 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
new file mode 100644
index 0000000..ced2de3
--- /dev/null
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -0,0 +1,817 @@
+/*
+ * Support for SATA devices on Serial Attached SCSI (SAS) controllers
+ *
+ * Copyright (C) 2006 IBM Corporation
+ *
+ * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+#include <linux/scatterlist.h>
+
+#include <scsi/sas_ata.h>
+#include "sas_internal.h"
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include "../scsi_sas_internal.h"
+#include "../scsi_transport_api.h"
+#include <scsi/scsi_eh.h>
+
+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:
+ 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;
+
+ case SAS_PROTO_RESPONSE:
+ /* This means the ending_fis has the error
+ * value; return 0 here to collect it */
+ return 0;
+ 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;
+ struct task_status_struct *stat = &task->task_status;
+ struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
+ struct sas_ha_struct *sas_ha;
+ enum ata_completion_errors ac;
+ unsigned long flags;
+
+ if (!qc)
+ goto qc_already_gone;
+
+ dev = qc->ap->private_data;
+ sas_ha = dev->port->ha;
+
+ spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
+ if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
+ 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;
+ } else if (stat->stat != SAM_STAT_GOOD) {
+ 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;
+ }
+ }
+
+ qc->lldd_task = NULL;
+ if (qc->scsicmd)
+ ASSIGN_SAS_TASK(qc->scsicmd, NULL);
+ ata_qc_complete(qc);
+ spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
+
+ /*
+ * If the sas_task has an ata qc, a scsi_cmnd and the aborted
+ * flag is set, then we must have come in via the libsas EH
+ * functions. When we exit this function, we need to put the
+ * scsi_cmnd on the list of finished errors. The ata_qc_complete
+ * call cleans up the libata side of things but we're protected
+ * from the scsi_cmnd going away because the scsi_cmnd is owned
+ * by the EH, making libata's call to scsi_done a NOP.
+ */
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
+ scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+qc_already_gone:
+ list_del_init(&task->list);
+ sas_free_task(task);
+}
+
+static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
+{
+ int res;
+ 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)
+ return AC_ERR_SYSTEM;
+ task->dev = dev;
+ task->task_proto = SAS_PROTOCOL_STP;
+ task->task_done = sas_ata_task_done;
+
+ if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
+ qc->tf.command == ATA_CMD_FPDMA_READ) {
+ /* Need to zero out the tag libata assigned us */
+ qc->tf.nsect = 0;
+ }
+
+ ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
+ task->uldd_task = qc;
+ if (is_atapi_taskfile(&qc->tf)) {
+ memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->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;
+ qc->lldd_task = task;
+
+ switch (qc->tf.protocol) {
+ case ATA_PROT_NCQ:
+ task->ata_task.use_ncq = 1;
+ /* fall through */
+ case ATA_PROT_ATAPI_DMA:
+ case ATA_PROT_DMA:
+ task->ata_task.dma_xfer = 1;
+ break;
+ }
+
+ if (qc->scsicmd)
+ ASSIGN_SAS_TASK(qc->scsicmd, task);
+
+ 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);
+
+ if (qc->scsicmd)
+ ASSIGN_SAS_TASK(qc->scsicmd, NULL);
+ sas_free_task(task);
+ return AC_ERR_SYSTEM;
+ }
+
+ return 0;
+}
+
+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_UNKNOWN;
+ 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) {
+ /*
+ * Find the sas_task and kill it. By this point,
+ * libata has decided to kill the qc, so we needn't
+ * bother with sas_ata_task_done. But we still
+ * ought to abort the task.
+ */
+ struct sas_task *task = qc->lldd_task;
+ unsigned long flags;
+
+ qc->lldd_task = NULL;
+ if (task) {
+ /* Should this be a AT(API) device reset? */
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ task->uldd_task = NULL;
+ __sas_task_abort(task);
+ }
+ }
+}
+
+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 int 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;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int sas_ata_scr_read(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:
+ *val = dev->sata_dev.sstatus;
+ return 0;
+ case SCR_CONTROL:
+ *val = dev->sata_dev.scontrol;
+ return 0;
+ case SCR_ERROR:
+ *val = dev->sata_dev.serror;
+ return 0;
+ case SCR_ACTIVE:
+ *val = dev->sata_dev.ap->sactive;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+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 | ATA_FLAG_NCQ,
+ .pio_mask = 0x1f, /* PIO0-4 */
+ .mwdma_mask = 0x07, /* MWDMA0-2 */
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &sas_sata_ops
+};
+
+int sas_ata_init_host_and_port(struct domain_device *found_dev,
+ struct scsi_target *starget)
+{
+ struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ 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;
+ ap->scsi_host = shost;
+ found_dev->sata_dev.ap = ap;
+
+ return 0;
+}
+
+void sas_ata_task_abort(struct sas_task *task)
+{
+ struct ata_queued_cmd *qc = task->uldd_task;
+ struct completion *waiting;
+
+ /* Bounce SCSI-initiated commands to the SCSI EH */
+ if (qc->scsicmd) {
+ scsi_req_abort_cmd(qc->scsicmd);
+ scsi_schedule_eh(qc->scsicmd->device->host);
+ return;
+ }
+
+ /* Internal command, fake a timeout and complete. */
+ qc->flags &= ~ATA_QCFLAG_ACTIVE;
+ qc->flags |= ATA_QCFLAG_FAILED;
+ qc->err_mask |= AC_ERR_TIMEOUT;
+ waiting = qc->private_data;
+ 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
+ * @pci_dma_dir: PCI_DMA_...
+ */
+static int sas_execute_task(struct sas_task *task, void *buffer, int size,
+ int pci_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 (pci_dma_dir != PCI_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 = pci_dma_dir;
+ task->task_done = sas_disc_task_done;
+ if (pci_dma_dir != PCI_DMA_NONE &&
+ sas_protocol_ata(task->task_proto)) {
+ task->num_scatter = pci_map_sg(task->dev->port->ha->pcidev,
+ 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 = -ETASK;
+ 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_BUSY ||
+ task->task_status.stat == SAM_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_CHECK_COND) {
+ 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_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 (pci_dma_dir != PCI_DMA_NONE) {
+ if (sas_protocol_ata(task->task_proto))
+ pci_unmap_sg(task->dev->port->ha->pcidev,
+ 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 =
+ (struct dev_to_host_fis *) dev->frame_rcvd;
+
+ if ((fis->sector_count == 1 && /* ATA */
+ fis->lbal == 1 &&
+ fis->lbam == 0 &&
+ fis->lbah == 0 &&
+ fis->device == 0)
+ ||
+ (fis->sector_count == 0 && /* CE-ATA (mATA) */
+ fis->lbal == 0 &&
+ fis->lbam == 0xCE &&
+ fis->lbah == 0xAA &&
+ (fis->device & ~0x10) == 0))
+
+ dev->sata_dev.command_set = ATA_COMMAND_SET;
+
+ else if ((fis->interrupt_reason == 1 && /* ATAPI */
+ fis->lbal == 1 &&
+ fis->byte_count_low == 0x14 &&
+ fis->byte_count_high == 0xEB &&
+ (fis->device & ~0x10) == 0))
+
+ dev->sata_dev.command_set = ATAPI_COMMAND_SET;
+
+ else if ((fis->sector_count == 1 && /* SEMB */
+ fis->lbal == 1 &&
+ fis->lbam == 0x3C &&
+ fis->lbah == 0xC3 &&
+ fis->device == 0)
+ ||
+ (fis->interrupt_reason == 1 && /* SATA PM */
+ fis->lbal == 1 &&
+ fis->byte_count_low == 0x69 &&
+ fis->byte_count_high == 0x96 &&
+ (fis->device & ~0x10) == 0))
+
+ /* Treat it as a superset? */
+ 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
+ * @pci_dma_dir: PCI_DMA_...
+ */
+static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
+ u8 features, void *buffer, int size,
+ int pci_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, pci_dma_dir);
+
+ sas_free_task(task);
+out:
+ return res;
+}
+
+static void sas_sata_propagate_sas_addr(struct domain_device *dev)
+{
+ unsigned long flags;
+ struct asd_sas_port *port = dev->port;
+ struct asd_sas_phy *phy;
+
+ BUG_ON(dev->parent);
+
+ memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
+ spin_lock_irqsave(&port->phy_list_lock, flags);
+ list_for_each_entry(phy, &port->phy_list, port_phy_el)
+ memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
+ spin_unlock_irqrestore(&port->phy_list_lock, flags);
+}
+
+#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,
+ PCI_DMA_FROMDEVICE);
+ 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 (!le16_to_cpu(identify_x[83] & (1<<6)))
+ goto cont1;
+ res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
+ ATA_FEATURE_PUP_STBY_SPIN_UP,
+ NULL, 0, PCI_DMA_NONE);
+ if (res)
+ goto cont1;
+
+ schedule_timeout_interruptible(5*HZ); /* More time? */
+ res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
+ PCI_DMA_FROMDEVICE);
+ if (res)
+ goto out_err;
+ }
+cont1:
+ /* Get WWN */
+ if (dev->port->oob_mode != SATA_OOB_MODE) {
+ memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
+ SAS_ADDR_SIZE);
+ } else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
+ (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
+ == 0x5000) {
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ dev->sas_addr[2*i] =
+ (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
+ dev->sas_addr[2*i+1] =
+ le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
+ }
+ }
+ sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
+ if (!dev->parent)
+ sas_sata_propagate_sas_addr(dev);
+
+ /* 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;
+}
+
+/**
+ * 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.
+ */
+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 (!res) {
+ sas_notify_lldd_dev_found(dev);
+ res = sas_rphy_add(dev->rphy);
+ }
+
+ return res;
+}
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