[linux-2.6-block.git] / drivers / scsi / aic94xx / aic94xx_task.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Aic94xx SAS/SATA Tasks
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 */

#include <linux/spinlock.h>
#include "aic94xx.h"
#include "aic94xx_sas.h"
#include "aic94xx_hwi.h"

static void asd_unbuild_ata_ascb(struct asd_ascb *a);
static void asd_unbuild_smp_ascb(struct asd_ascb *a);
static void asd_unbuild_ssp_ascb(struct asd_ascb *a);

static void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
{
	unsigned long flags;

	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
	asd_ha->seq.can_queue += num;
	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
}

/* DMA_... to our direction translation.
 */
static const u8 data_dir_flags[] = {
	[DMA_BIDIRECTIONAL]	= DATA_DIR_BYRECIPIENT,	/* UNSPECIFIED */
	[DMA_TO_DEVICE]		= DATA_DIR_OUT,		/* OUTBOUND */
	[DMA_FROM_DEVICE]	= DATA_DIR_IN,		/* INBOUND */
	[DMA_NONE]		= DATA_DIR_NONE,	/* NO TRANSFER */
};

static int asd_map_scatterlist(struct sas_task *task,
			       struct sg_el *sg_arr,
			       gfp_t gfp_flags)
{
	struct asd_ascb *ascb = task->lldd_task;
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct scatterlist *sc;
	int num_sg, res;

	if (task->data_dir == DMA_NONE)
		return 0;

	if (task->num_scatter == 0) {
		void *p = task->scatter;
		dma_addr_t dma = dma_map_single(&asd_ha->pcidev->dev, p,
						task->total_xfer_len,
						task->data_dir);
		sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
		sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
		sg_arr[0].flags |= ASD_SG_EL_LIST_EOL;
		return 0;
	}

	/* STP tasks come from libata which has already mapped
	 * the SG list */
	if (sas_protocol_ata(task->task_proto))
		num_sg = task->num_scatter;
	else
		num_sg = dma_map_sg(&asd_ha->pcidev->dev, task->scatter,
				    task->num_scatter, task->data_dir);
	if (num_sg == 0)
		return -ENOMEM;

	if (num_sg > 3) {
		int i;

		ascb->sg_arr = asd_alloc_coherent(asd_ha,
						  num_sg*sizeof(struct sg_el),
						  gfp_flags);
		if (!ascb->sg_arr) {
			res = -ENOMEM;
			goto err_unmap;
		}
		for_each_sg(task->scatter, sc, num_sg, i) {
			struct sg_el *sg =
				&((struct sg_el *)ascb->sg_arr->vaddr)[i];
			sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
			sg->size = cpu_to_le32((u32)sg_dma_len(sc));
			if (i == num_sg-1)
				sg->flags |= ASD_SG_EL_LIST_EOL;
		}

		for_each_sg(task->scatter, sc, 2, i) {
			sg_arr[i].bus_addr =
				cpu_to_le64((u64)sg_dma_address(sc));
			sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
		}
		sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
		sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;

		memset(&sg_arr[2], 0, sizeof(*sg_arr));
		sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
	} else {
		int i;
		for_each_sg(task->scatter, sc, num_sg, i) {
			sg_arr[i].bus_addr =
				cpu_to_le64((u64)sg_dma_address(sc));
			sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
		}
		sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
	}

	return 0;
err_unmap:
	if (sas_protocol_ata(task->task_proto))
		dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
			     task->num_scatter, task->data_dir);
	return res;
}

static void asd_unmap_scatterlist(struct asd_ascb *ascb)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct sas_task *task = ascb->uldd_task;

	if (task->data_dir == DMA_NONE)
		return;

	if (task->num_scatter == 0) {
		dma_addr_t dma = (dma_addr_t)
		       le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
		dma_unmap_single(&ascb->ha->pcidev->dev, dma,
				 task->total_xfer_len, task->data_dir);
		return;
	}

	asd_free_coherent(asd_ha, ascb->sg_arr);
	if (task->task_proto != SAS_PROTOCOL_STP)
		dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
			     task->num_scatter, task->data_dir);
}

/* ---------- Task complete tasklet ---------- */

static void asd_get_response_tasklet(struct asd_ascb *ascb,
				     struct done_list_struct *dl)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct sas_task *task = ascb->uldd_task;
	struct task_status_struct *ts = &task->task_status;
	unsigned long flags;
	struct tc_resp_sb_struct {
		__le16 index_escb;
		u8     len_lsb;
		u8     flags;
	} __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;

/* 	int  size   = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
	int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
	struct asd_ascb *escb;
	struct asd_dma_tok *edb;
	void *r;

	spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
	escb = asd_tc_index_find(&asd_ha->seq,
				 (int)le16_to_cpu(resp_sb->index_escb));
	spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);

	if (!escb) {
		ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
		return;
	}

	ts->buf_valid_size = 0;
	edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
	r = edb->vaddr;
	if (task->task_proto == SAS_PROTOCOL_SSP) {
		struct ssp_response_iu *iu =
			r + 16 + sizeof(struct ssp_frame_hdr);

		ts->residual = le32_to_cpu(*(__le32 *)r);

		sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
	}  else {
		struct ata_task_resp *resp = (void *) &ts->buf[0];

		ts->residual = le32_to_cpu(*(__le32 *)r);

		if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
			resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
			memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
			ts->buf_valid_size = sizeof(*resp);
		}
	}

	asd_invalidate_edb(escb, edb_id);
}

static void asd_task_tasklet_complete(struct asd_ascb *ascb,
				      struct done_list_struct *dl)
{
	struct sas_task *task = ascb->uldd_task;
	struct task_status_struct *ts = &task->task_status;
	unsigned long flags;
	u8 opcode = dl->opcode;

	asd_can_dequeue(ascb->ha, 1);

Again:
	switch (opcode) {
	case TC_NO_ERROR:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAM_STAT_GOOD;
		break;
	case TC_UNDERRUN:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_DATA_UNDERRUN;
		ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
		break;
	case TC_OVERRUN:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_DATA_OVERRUN;
		ts->residual = 0;
		break;
	case TC_SSP_RESP:
	case TC_ATA_RESP:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_PROTO_RESPONSE;
		asd_get_response_tasklet(ascb, dl);
		break;
	case TF_OPEN_REJECT:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_OPEN_REJECT;
		if (dl->status_block[1] & 2)
			ts->open_rej_reason = 1 + dl->status_block[2];
		else if (dl->status_block[1] & 1)
			ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
		else
			ts->open_rej_reason = SAS_OREJ_UNKNOWN;
		break;
	case TF_OPEN_TO:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_OPEN_TO;
		break;
	case TF_PHY_DOWN:
	case TU_PHY_DOWN:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_PHY_DOWN;
		break;
	case TI_PHY_DOWN:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_PHY_DOWN;
		break;
	case TI_BREAK:
	case TI_PROTO_ERR:
	case TI_NAK:
	case TI_ACK_NAK_TO:
	case TF_SMP_XMIT_RCV_ERR:
	case TC_ATA_R_ERR_RECV:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_INTERRUPTED;
		break;
	case TF_BREAK:
	case TU_BREAK:
	case TU_ACK_NAK_TO:
	case TF_SMPRSP_TO:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_DEV_NO_RESPONSE;
		break;
	case TF_NAK_RECV:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_NAK_R_ERR;
		break;
	case TA_I_T_NEXUS_LOSS:
		opcode = dl->status_block[0];
		goto Again;
		break;
	case TF_INV_CONN_HANDLE:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_DEVICE_UNKNOWN;
		break;
	case TF_REQUESTED_N_PENDING:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_PENDING;
		break;
	case TC_TASK_CLEARED:
	case TA_ON_REQ:
		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_ABORTED_TASK;
		break;

	case TF_NO_SMP_CONN:
	case TF_TMF_NO_CTX:
	case TF_TMF_NO_TAG:
	case TF_TMF_TAG_FREE:
	case TF_TMF_TASK_DONE:
	case TF_TMF_NO_CONN_HANDLE:
	case TF_IRTT_TO:
	case TF_IU_SHORT:
	case TF_DATA_OFFS_ERR:
		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_DEV_NO_RESPONSE;
		break;

	case TC_LINK_ADM_RESP:
	case TC_CONTROL_PHY:
	case TC_RESUME:
	case TC_PARTIAL_SG_LIST:
	default:
		ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
		break;
	}

	switch (task->task_proto) {
	case SAS_PROTOCOL_SATA:
	case SAS_PROTOCOL_STP:
		asd_unbuild_ata_ascb(ascb);
		break;
	case SAS_PROTOCOL_SMP:
		asd_unbuild_smp_ascb(ascb);
		break;
	case SAS_PROTOCOL_SSP:
		asd_unbuild_ssp_ascb(ascb);
	default:
		break;
	}

	spin_lock_irqsave(&task->task_state_lock, flags);
	task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
	task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
	task->task_state_flags |= SAS_TASK_STATE_DONE;
	if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
		struct completion *completion = ascb->completion;
		spin_unlock_irqrestore(&task->task_state_lock, flags);
		ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
			    "stat 0x%x but aborted by upper layer!\n",
			    task, opcode, ts->resp, ts->stat);
		if (completion)
			complete(completion);
	} else {
		spin_unlock_irqrestore(&task->task_state_lock, flags);
		task->lldd_task = NULL;
		asd_ascb_free(ascb);
		mb();
		task->task_done(task);
	}
}

/* ---------- ATA ---------- */

static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct domain_device *dev = task->dev;
	struct scb *scb;
	u8     flags;
	int    res = 0;

	scb = ascb->scb;

	if (unlikely(task->ata_task.device_control_reg_update))
		scb->header.opcode = CONTROL_ATA_DEV;
	else if (dev->sata_dev.class == ATA_DEV_ATAPI)
		scb->header.opcode = INITIATE_ATAPI_TASK;
	else
		scb->header.opcode = INITIATE_ATA_TASK;

	scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
	if (dev->port->oob_mode == SAS_OOB_MODE)
		scb->ata_task.proto_conn_rate |= dev->linkrate;

	scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	scb->ata_task.fis = task->ata_task.fis;
	if (likely(!task->ata_task.device_control_reg_update))
		scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
	scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
	if (dev->sata_dev.class == ATA_DEV_ATAPI)
		memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
		       16);
	scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->ata_task.conn_handle = cpu_to_le16(
		(u16)(unsigned long)dev->lldd_dev);

	if (likely(!task->ata_task.device_control_reg_update)) {
		flags = 0;
		if (task->ata_task.dma_xfer)
			flags |= DATA_XFER_MODE_DMA;
		if (task->ata_task.use_ncq &&
		    dev->sata_dev.class != ATA_DEV_ATAPI)
			flags |= ATA_Q_TYPE_NCQ;
		flags |= data_dir_flags[task->data_dir];
		scb->ata_task.ata_flags = flags;

		scb->ata_task.retry_count = task->ata_task.retry_count;

		flags = 0;
		if (task->ata_task.set_affil_pol)
			flags |= SET_AFFIL_POLICY;
		if (task->ata_task.stp_affil_pol)
			flags |= STP_AFFIL_POLICY;
		scb->ata_task.flags = flags;
	}
	ascb->tasklet_complete = asd_task_tasklet_complete;

	if (likely(!task->ata_task.device_control_reg_update))
		res = asd_map_scatterlist(task, scb->ata_task.sg_element,
					  gfp_flags);

	return res;
}

static void asd_unbuild_ata_ascb(struct asd_ascb *a)
{
	asd_unmap_scatterlist(a);
}

/* ---------- SMP ---------- */

static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct domain_device *dev = task->dev;
	struct scb *scb;

	dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_req, 1,
		   DMA_TO_DEVICE);
	dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_resp, 1,
		   DMA_FROM_DEVICE);

	scb = ascb->scb;

	scb->header.opcode = INITIATE_SMP_TASK;

	scb->smp_task.proto_conn_rate = dev->linkrate;

	scb->smp_task.smp_req.bus_addr =
		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
	scb->smp_task.smp_req.size =
		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);

	scb->smp_task.smp_resp.bus_addr =
		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
	scb->smp_task.smp_resp.size =
		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);

	scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->smp_task.conn_handle = cpu_to_le16((u16)
						(unsigned long)dev->lldd_dev);

	ascb->tasklet_complete = asd_task_tasklet_complete;

	return 0;
}

static void asd_unbuild_smp_ascb(struct asd_ascb *a)
{
	struct sas_task *task = a->uldd_task;

	BUG_ON(!task);
	dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_req, 1,
		     DMA_TO_DEVICE);
	dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_resp, 1,
		     DMA_FROM_DEVICE);
}

/* ---------- SSP ---------- */

static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct domain_device *dev = task->dev;
	struct scb *scb;
	int    res = 0;

	scb = ascb->scb;

	scb->header.opcode = INITIATE_SSP_TASK;

	scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
	scb->ssp_task.proto_conn_rate |= dev->linkrate;
	scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
	memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
	       HASHED_SAS_ADDR_SIZE);
	memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
	       dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
	scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);

	memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
	if (task->ssp_task.enable_first_burst)
		scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
	memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
	       task->ssp_task.cmd->cmd_len);

	scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->ssp_task.conn_handle = cpu_to_le16(
		(u16)(unsigned long)dev->lldd_dev);
	scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
	scb->ssp_task.retry_count = scb->ssp_task.retry_count;

	ascb->tasklet_complete = asd_task_tasklet_complete;

	res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);

	return res;
}

static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
{
	asd_unmap_scatterlist(a);
}

/* ---------- Execute Task ---------- */

static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
{
	int res = 0;
	unsigned long flags;

	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
	if ((asd_ha->seq.can_queue - num) < 0)
		res = -SAS_QUEUE_FULL;
	else
		asd_ha->seq.can_queue -= num;
	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);

	return res;
}

int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
{
	int res = 0;
	LIST_HEAD(alist);
	struct sas_task *t = task;
	struct asd_ascb *ascb = NULL, *a;
	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
	unsigned long flags;

	res = asd_can_queue(asd_ha, 1);
	if (res)
		return res;

	res = 1;
	ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
	if (res) {
		res = -ENOMEM;
		goto out_err;
	}

	__list_add(&alist, ascb->list.prev, &ascb->list);
	list_for_each_entry(a, &alist, list) {
		a->uldd_task = t;
		t->lldd_task = a;
		break;
	}
	list_for_each_entry(a, &alist, list) {
		t = a->uldd_task;
		a->uldd_timer = 1;
		if (t->task_proto & SAS_PROTOCOL_STP)
			t->task_proto = SAS_PROTOCOL_STP;
		switch (t->task_proto) {
		case SAS_PROTOCOL_SATA:
		case SAS_PROTOCOL_STP:
			res = asd_build_ata_ascb(a, t, gfp_flags);
			break;
		case SAS_PROTOCOL_SMP:
			res = asd_build_smp_ascb(a, t, gfp_flags);
			break;
		case SAS_PROTOCOL_SSP:
			res = asd_build_ssp_ascb(a, t, gfp_flags);
			break;
		default:
			asd_printk("unknown sas_task proto: 0x%x\n",
				   t->task_proto);
			res = -ENOMEM;
			break;
		}
		if (res)
			goto out_err_unmap;

		spin_lock_irqsave(&t->task_state_lock, flags);
		t->task_state_flags |= SAS_TASK_AT_INITIATOR;
		spin_unlock_irqrestore(&t->task_state_lock, flags);
	}
	list_del_init(&alist);

	res = asd_post_ascb_list(asd_ha, ascb, 1);
	if (unlikely(res)) {
		a = NULL;
		__list_add(&alist, ascb->list.prev, &ascb->list);
		goto out_err_unmap;
	}

	return 0;
out_err_unmap:
	{
		struct asd_ascb *b = a;
		list_for_each_entry(a, &alist, list) {
			if (a == b)
				break;
			t = a->uldd_task;
			spin_lock_irqsave(&t->task_state_lock, flags);
			t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
			spin_unlock_irqrestore(&t->task_state_lock, flags);
			switch (t->task_proto) {
			case SAS_PROTOCOL_SATA:
			case SAS_PROTOCOL_STP:
				asd_unbuild_ata_ascb(a);
				break;
			case SAS_PROTOCOL_SMP:
				asd_unbuild_smp_ascb(a);
				break;
			case SAS_PROTOCOL_SSP:
				asd_unbuild_ssp_ascb(a);
			default:
				break;
			}
			t->lldd_task = NULL;
		}
	}
	list_del_init(&alist);
out_err:
	if (ascb)
		asd_ascb_free_list(ascb);
	asd_can_dequeue(asd_ha, 1);
	return res;
}
Commit	Line	Data
65c85c83	1	// SPDX-License-Identifier: GPL-2.0-only
2908d778 JB	2	/*
	3	* Aic94xx SAS/SATA Tasks
	4	*
	5	* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
	6	* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
2908d778 JB	7	*/
	8
	9	#include <linux/spinlock.h>
	10	#include "aic94xx.h"
	11	#include "aic94xx_sas.h"
	12	#include "aic94xx_hwi.h"
	13
	14	static void asd_unbuild_ata_ascb(struct asd_ascb *a);
	15	static void asd_unbuild_smp_ascb(struct asd_ascb *a);
	16	static void asd_unbuild_ssp_ascb(struct asd_ascb *a);
	17
81e56ded	18	static void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
2908d778 JB	19	{
	20	unsigned long flags;
	21
	22	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
	23	asd_ha->seq.can_queue += num;
	24	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
	25	}
	26
3a21986f	27	/* DMA_... to our direction translation.
2908d778 JB	28	*/
2908d778 JB	29	static const u8 data_dir_flags[] = {
3a21986f CH	30	[DMA_BIDIRECTIONAL] = DATA_DIR_BYRECIPIENT, /* UNSPECIFIED */
	31	[DMA_TO_DEVICE] = DATA_DIR_OUT, /* OUTBOUND */
	32	[DMA_FROM_DEVICE] = DATA_DIR_IN, /* INBOUND */
	33	[DMA_NONE] = DATA_DIR_NONE, /* NO TRANSFER */
2908d778 JB	34	};
2908d778 JB	35
81e56ded AB	36	static int asd_map_scatterlist(struct sas_task *task,
	37	struct sg_el *sg_arr,
	38	gfp_t gfp_flags)
2908d778 JB	39	{
	40	struct asd_ascb *ascb = task->lldd_task;
	41	struct asd_ha_struct *asd_ha = ascb->ha;
	42	struct scatterlist *sc;
	43	int num_sg, res;
	44
3a21986f	45	if (task->data_dir == DMA_NONE)
2908d778 JB	46	return 0;
	47
	48	if (task->num_scatter == 0) {
	49	void *p = task->scatter;
3a21986f	50	dma_addr_t dma = dma_map_single(&asd_ha->pcidev->dev, p,
2908d778 JB	51	task->total_xfer_len,
	52	task->data_dir);
	53	sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
	54	sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
	55	sg_arr[0].flags \|= ASD_SG_EL_LIST_EOL;
	56	return 0;
	57	}
	58
ba330ffe DW	59	/* STP tasks come from libata which has already mapped
ba330ffe DW	60	* the SG list */
0f05df8b	61	if (sas_protocol_ata(task->task_proto))
ba330ffe DW	62	num_sg = task->num_scatter;
ba330ffe DW	63	else
3a21986f	64	num_sg = dma_map_sg(&asd_ha->pcidev->dev, task->scatter,
ba330ffe	65	task->num_scatter, task->data_dir);
2908d778 JB	66	if (num_sg == 0)
	67	return -ENOMEM;
	68
	69	if (num_sg > 3) {
	70	int i;
	71
	72	ascb->sg_arr = asd_alloc_coherent(asd_ha,
	73	num_sg*sizeof(struct sg_el),
	74	gfp_flags);
	75	if (!ascb->sg_arr) {
	76	res = -ENOMEM;
	77	goto err_unmap;
	78	}
8145bfe4	79	for_each_sg(task->scatter, sc, num_sg, i) {
2908d778 JB	80	struct sg_el *sg =
	81	&((struct sg_el *)ascb->sg_arr->vaddr)[i];
	82	sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
	83	sg->size = cpu_to_le32((u32)sg_dma_len(sc));
	84	if (i == num_sg-1)
	85	sg->flags \|= ASD_SG_EL_LIST_EOL;
	86	}
	87
8145bfe4	88	for_each_sg(task->scatter, sc, 2, i) {
2908d778 JB	89	sg_arr[i].bus_addr =
	90	cpu_to_le64((u64)sg_dma_address(sc));
	91	sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
	92	}
	93	sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
	94	sg_arr[1].flags \|= ASD_SG_EL_LIST_EOS;
	95
	96	memset(&sg_arr[2], 0, sizeof(*sg_arr));
	97	sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
	98	} else {
	99	int i;
8145bfe4	100	for_each_sg(task->scatter, sc, num_sg, i) {
2908d778 JB	101	sg_arr[i].bus_addr =
	102	cpu_to_le64((u64)sg_dma_address(sc));
	103	sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
	104	}
	105	sg_arr[i-1].flags \|= ASD_SG_EL_LIST_EOL;
	106	}
	107
	108	return 0;
	109	err_unmap:
0f05df8b	110	if (sas_protocol_ata(task->task_proto))
3a21986f CH	111	dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
3a21986f CH	112	task->num_scatter, task->data_dir);
2908d778 JB	113	return res;
	114	}
	115
81e56ded	116	static void asd_unmap_scatterlist(struct asd_ascb *ascb)
2908d778 JB	117	{
	118	struct asd_ha_struct *asd_ha = ascb->ha;
	119	struct sas_task *task = ascb->uldd_task;
	120
3a21986f	121	if (task->data_dir == DMA_NONE)
2908d778 JB	122	return;
	123
	124	if (task->num_scatter == 0) {
	125	dma_addr_t dma = (dma_addr_t)
	126	le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
3a21986f CH	127	dma_unmap_single(&ascb->ha->pcidev->dev, dma,
3a21986f CH	128	task->total_xfer_len, task->data_dir);
2908d778 JB	129	return;
	130	}
	131
	132	asd_free_coherent(asd_ha, ascb->sg_arr);
ba330ffe	133	if (task->task_proto != SAS_PROTOCOL_STP)
3a21986f CH	134	dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
3a21986f CH	135	task->num_scatter, task->data_dir);
2908d778 JB	136	}
	137
	138	/* ---------- Task complete tasklet ---------- */
	139
	140	static void asd_get_response_tasklet(struct asd_ascb *ascb,
	141	struct done_list_struct *dl)
	142	{
	143	struct asd_ha_struct *asd_ha = ascb->ha;
	144	struct sas_task *task = ascb->uldd_task;
	145	struct task_status_struct *ts = &task->task_status;
	146	unsigned long flags;
	147	struct tc_resp_sb_struct {
	148	__le16 index_escb;
	149	u8 len_lsb;
	150	u8 flags;
	151	} __attribute__ ((packed)) resp_sb = (void ) dl->status_block;
	152
	153	/* int size = ((resp_sb->flags & 7) << 8) \| resp_sb->len_lsb; */
	154	int edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
	155	struct asd_ascb *escb;
	156	struct asd_dma_tok *edb;
	157	void *r;
	158
	159	spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
	160	escb = asd_tc_index_find(&asd_ha->seq,
	161	(int)le16_to_cpu(resp_sb->index_escb));
	162	spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
	163
	164	if (!escb) {
	165	ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
	166	return;
	167	}
	168
	169	ts->buf_valid_size = 0;
	170	edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
	171	r = edb->vaddr;
5929faf3	172	if (task->task_proto == SAS_PROTOCOL_SSP) {
2908d778 JB	173	struct ssp_response_iu *iu =
	174	r + 16 + sizeof(struct ssp_frame_hdr);
	175
	176	ts->residual = le32_to_cpu((__le32 )r);
366ca51f JB	177
366ca51f JB	178	sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
2908d778 JB	179	} else {
	180	struct ata_task_resp resp = (void ) &ts->buf[0];
	181
	182	ts->residual = le32_to_cpu((__le32 )r);
	183
	184	if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
	185	resp->frame_len = le16_to_cpu((__le16 )(r+6));
6ef1b512	186	memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
2908d778 JB	187	ts->buf_valid_size = sizeof(*resp);
	188	}
	189	}
	190
	191	asd_invalidate_edb(escb, edb_id);
	192	}
	193
	194	static void asd_task_tasklet_complete(struct asd_ascb *ascb,
	195	struct done_list_struct *dl)
	196	{
	197	struct sas_task *task = ascb->uldd_task;
	198	struct task_status_struct *ts = &task->task_status;
	199	unsigned long flags;
	200	u8 opcode = dl->opcode;
	201
	202	asd_can_dequeue(ascb->ha, 1);
	203
	204	Again:
	205	switch (opcode) {
	206	case TC_NO_ERROR:
	207	ts->resp = SAS_TASK_COMPLETE;
df64d3ca	208	ts->stat = SAM_STAT_GOOD;
2908d778 JB	209	break;
	210	case TC_UNDERRUN:
	211	ts->resp = SAS_TASK_COMPLETE;
	212	ts->stat = SAS_DATA_UNDERRUN;
	213	ts->residual = le32_to_cpu((__le32 )dl->status_block);
	214	break;
	215	case TC_OVERRUN:
	216	ts->resp = SAS_TASK_COMPLETE;
	217	ts->stat = SAS_DATA_OVERRUN;
	218	ts->residual = 0;
	219	break;
	220	case TC_SSP_RESP:
	221	case TC_ATA_RESP:
	222	ts->resp = SAS_TASK_COMPLETE;
	223	ts->stat = SAS_PROTO_RESPONSE;
	224	asd_get_response_tasklet(ascb, dl);
	225	break;
	226	case TF_OPEN_REJECT:
	227	ts->resp = SAS_TASK_UNDELIVERED;
	228	ts->stat = SAS_OPEN_REJECT;
	229	if (dl->status_block[1] & 2)
	230	ts->open_rej_reason = 1 + dl->status_block[2];
	231	else if (dl->status_block[1] & 1)
	232	ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
	233	else
	234	ts->open_rej_reason = SAS_OREJ_UNKNOWN;
	235	break;
	236	case TF_OPEN_TO:
	237	ts->resp = SAS_TASK_UNDELIVERED;
	238	ts->stat = SAS_OPEN_TO;
	239	break;
	240	case TF_PHY_DOWN:
	241	case TU_PHY_DOWN:
	242	ts->resp = SAS_TASK_UNDELIVERED;
	243	ts->stat = SAS_PHY_DOWN;
	244	break;
	245	case TI_PHY_DOWN:
	246	ts->resp = SAS_TASK_COMPLETE;
	247	ts->stat = SAS_PHY_DOWN;
	248	break;
	249	case TI_BREAK:
	250	case TI_PROTO_ERR:
	251	case TI_NAK:
	252	case TI_ACK_NAK_TO:
	253	case TF_SMP_XMIT_RCV_ERR:
	254	case TC_ATA_R_ERR_RECV:
	255	ts->resp = SAS_TASK_COMPLETE;
	256	ts->stat = SAS_INTERRUPTED;
	257	break;
	258	case TF_BREAK:
	259	case TU_BREAK:
	260	case TU_ACK_NAK_TO:
	261	case TF_SMPRSP_TO:
	262	ts->resp = SAS_TASK_UNDELIVERED;
	263	ts->stat = SAS_DEV_NO_RESPONSE;
	264	break;
	265	case TF_NAK_RECV:
	266	ts->resp = SAS_TASK_COMPLETE;
	267	ts->stat = SAS_NAK_R_ERR;
	268	break;
	269	case TA_I_T_NEXUS_LOSS:
	270	opcode = dl->status_block[0];
	271	goto Again;
	272	break;
273	case TF_INV_CONN_HANDLE:
274	ts->resp = SAS_TASK_UNDELIVERED;
275	ts->stat = SAS_DEVICE_UNKNOWN;
276	break;
277	case TF_REQUESTED_N_PENDING:
278	ts->resp = SAS_TASK_UNDELIVERED;
279	ts->stat = SAS_PENDING;
280	break;
281	case TC_TASK_CLEARED:
282	case TA_ON_REQ:
283	ts->resp = SAS_TASK_COMPLETE;
284	ts->stat = SAS_ABORTED_TASK;
285	break;
286
287	case TF_NO_SMP_CONN:
288	case TF_TMF_NO_CTX:
289	case TF_TMF_NO_TAG:
290	case TF_TMF_TAG_FREE:
291	case TF_TMF_TASK_DONE:
292	case TF_TMF_NO_CONN_HANDLE:
293	case TF_IRTT_TO:
294	case TF_IU_SHORT:
295	case TF_DATA_OFFS_ERR:
296	ts->resp = SAS_TASK_UNDELIVERED;
297	ts->stat = SAS_DEV_NO_RESPONSE;
298	break;
299
300	case TC_LINK_ADM_RESP:
301	case TC_CONTROL_PHY:
302	case TC_RESUME:
303	case TC_PARTIAL_SG_LIST:
304	default:
cadbd4a5	305	ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
2908d778 JB	306	break;
	307	}
	308
	309	switch (task->task_proto) {
5929faf3 DW	310	case SAS_PROTOCOL_SATA:
5929faf3 DW	311	case SAS_PROTOCOL_STP:
2908d778 JB	312	asd_unbuild_ata_ascb(ascb);
2908d778 JB	313	break;
5929faf3	314	case SAS_PROTOCOL_SMP:
2908d778 JB	315	asd_unbuild_smp_ascb(ascb);
2908d778 JB	316	break;
5929faf3	317	case SAS_PROTOCOL_SSP:
2908d778 JB	318	asd_unbuild_ssp_ascb(ascb);
	319	default:
	320	break;
	321	}
	322
	323	spin_lock_irqsave(&task->task_state_lock, flags);
	324	task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
b218a0d8	325	task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
2908d778 JB	326	task->task_state_flags \|= SAS_TASK_STATE_DONE;
2908d778 JB	327	if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
e2396f1e	328	struct completion *completion = ascb->completion;
2908d778 JB	329	spin_unlock_irqrestore(&task->task_state_lock, flags);
	330	ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
	331	"stat 0x%x but aborted by upper layer!\n",
	332	task, opcode, ts->resp, ts->stat);
e2396f1e JB	333	if (completion)
e2396f1e JB	334	complete(completion);
2908d778 JB	335	} else {
	336	spin_unlock_irqrestore(&task->task_state_lock, flags);
	337	task->lldd_task = NULL;
	338	asd_ascb_free(ascb);
	339	mb();
	340	task->task_done(task);
	341	}
	342	}
	343
	344	/* ---------- ATA ---------- */
	345
	346	static int asd_build_ata_ascb(struct asd_ascb ascb, struct sas_task task,
3cc27547	347	gfp_t gfp_flags)
2908d778 JB	348	{
	349	struct domain_device *dev = task->dev;
	350	struct scb *scb;
	351	u8 flags;
	352	int res = 0;
	353
	354	scb = ascb->scb;
	355
	356	if (unlikely(task->ata_task.device_control_reg_update))
	357	scb->header.opcode = CONTROL_ATA_DEV;
1cbd772d	358	else if (dev->sata_dev.class == ATA_DEV_ATAPI)
2908d778	359	scb->header.opcode = INITIATE_ATAPI_TASK;
1cbd772d HR	360	else
1cbd772d HR	361	scb->header.opcode = INITIATE_ATA_TASK;
2908d778 JB	362
	363	scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
	364	if (dev->port->oob_mode == SAS_OOB_MODE)
	365	scb->ata_task.proto_conn_rate \|= dev->linkrate;
	366
	367	scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	368	scb->ata_task.fis = task->ata_task.fis;
2908d778 JB	369	if (likely(!task->ata_task.device_control_reg_update))
	370	scb->ata_task.fis.flags \|= 0x80; /* C=1: update ATA cmd reg */
	371	scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
1cbd772d	372	if (dev->sata_dev.class == ATA_DEV_ATAPI)
2908d778 JB	373	memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
	374	16);
	375	scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
	376	scb->ata_task.conn_handle = cpu_to_le16(
	377	(u16)(unsigned long)dev->lldd_dev);
	378
	379	if (likely(!task->ata_task.device_control_reg_update)) {
	380	flags = 0;
	381	if (task->ata_task.dma_xfer)
	382	flags \|= DATA_XFER_MODE_DMA;
	383	if (task->ata_task.use_ncq &&
1cbd772d	384	dev->sata_dev.class != ATA_DEV_ATAPI)
2908d778 JB	385	flags \|= ATA_Q_TYPE_NCQ;
	386	flags \|= data_dir_flags[task->data_dir];
	387	scb->ata_task.ata_flags = flags;
	388
	389	scb->ata_task.retry_count = task->ata_task.retry_count;
	390
	391	flags = 0;
	392	if (task->ata_task.set_affil_pol)
	393	flags \|= SET_AFFIL_POLICY;
	394	if (task->ata_task.stp_affil_pol)
	395	flags \|= STP_AFFIL_POLICY;
	396	scb->ata_task.flags = flags;
	397	}
	398	ascb->tasklet_complete = asd_task_tasklet_complete;
	399
	400	if (likely(!task->ata_task.device_control_reg_update))
	401	res = asd_map_scatterlist(task, scb->ata_task.sg_element,
	402	gfp_flags);
	403
	404	return res;
	405	}
	406
	407	static void asd_unbuild_ata_ascb(struct asd_ascb *a)
	408	{
	409	asd_unmap_scatterlist(a);
	410	}
	411
	412	/* ---------- SMP ---------- */
	413
	414	static int asd_build_smp_ascb(struct asd_ascb ascb, struct sas_task task,
3cc27547	415	gfp_t gfp_flags)
2908d778 JB	416	{
	417	struct asd_ha_struct *asd_ha = ascb->ha;
	418	struct domain_device *dev = task->dev;
	419	struct scb *scb;
	420
3a21986f CH	421	dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_req, 1,
	422	DMA_TO_DEVICE);
	423	dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_resp, 1,
	424	DMA_FROM_DEVICE);
2908d778 JB	425
	426	scb = ascb->scb;
	427
	428	scb->header.opcode = INITIATE_SMP_TASK;
	429
	430	scb->smp_task.proto_conn_rate = dev->linkrate;
	431
	432	scb->smp_task.smp_req.bus_addr =
	433	cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
	434	scb->smp_task.smp_req.size =
	435	cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
	436
	437	scb->smp_task.smp_resp.bus_addr =
	438	cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
	439	scb->smp_task.smp_resp.size =
	440	cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
	441
	442	scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
	443	scb->smp_task.conn_handle = cpu_to_le16((u16)
	444	(unsigned long)dev->lldd_dev);
	445
	446	ascb->tasklet_complete = asd_task_tasklet_complete;
	447
	448	return 0;
	449	}
	450
	451	static void asd_unbuild_smp_ascb(struct asd_ascb *a)
	452	{
	453	struct sas_task *task = a->uldd_task;
	454
	455	BUG_ON(!task);
3a21986f CH	456	dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_req, 1,
	457	DMA_TO_DEVICE);
	458	dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_resp, 1,
	459	DMA_FROM_DEVICE);
2908d778 JB	460	}
	461
	462	/* ---------- SSP ---------- */
	463
	464	static int asd_build_ssp_ascb(struct asd_ascb ascb, struct sas_task task,
3cc27547	465	gfp_t gfp_flags)
2908d778 JB	466	{
	467	struct domain_device *dev = task->dev;
	468	struct scb *scb;
	469	int res = 0;
	470
	471	scb = ascb->scb;
	472
	473	scb->header.opcode = INITIATE_SSP_TASK;
	474
	475	scb->ssp_task.proto_conn_rate = (1 << 4); /* SSP */
	476	scb->ssp_task.proto_conn_rate \|= dev->linkrate;
	477	scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	478	scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
	479	memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
	480	HASHED_SAS_ADDR_SIZE);
	481	memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
	482	dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
	483	scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
	484
	485	memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
	486	if (task->ssp_task.enable_first_burst)
	487	scb->ssp_task.ssp_cmd.efb_prio_attr \|= EFB_MASK;
	488	scb->ssp_task.ssp_cmd.efb_prio_attr \|= (task->ssp_task.task_prio << 3);
	489	scb->ssp_task.ssp_cmd.efb_prio_attr \|= (task->ssp_task.task_attr & 7);
e73823f7 JB	490	memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
e73823f7 JB	491	task->ssp_task.cmd->cmd_len);
2908d778 JB	492
	493	scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
	494	scb->ssp_task.conn_handle = cpu_to_le16(
	495	(u16)(unsigned long)dev->lldd_dev);
	496	scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
	497	scb->ssp_task.retry_count = scb->ssp_task.retry_count;
	498
	499	ascb->tasklet_complete = asd_task_tasklet_complete;
	500
	501	res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
	502
	503	return res;
	504	}
	505
	506	static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
	507	{
	508	asd_unmap_scatterlist(a);
	509	}
	510
	511	/* ---------- Execute Task ---------- */
	512
81e56ded	513	static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
2908d778 JB	514	{
	515	int res = 0;
	516	unsigned long flags;
	517
	518	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
	519	if ((asd_ha->seq.can_queue - num) < 0)
	520	res = -SAS_QUEUE_FULL;
	521	else
	522	asd_ha->seq.can_queue -= num;
	523	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
	524
	525	return res;
	526	}
	527
79855d17	528	int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
2908d778 JB	529	{
	530	int res = 0;
	531	LIST_HEAD(alist);
	532	struct sas_task *t = task;
	533	struct asd_ascb ascb = NULL, a;
	534	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
b218a0d8	535	unsigned long flags;
2908d778	536
79855d17	537	res = asd_can_queue(asd_ha, 1);
2908d778 JB	538	if (res)
	539	return res;
	540
79855d17	541	res = 1;
2908d778 JB	542	ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
	543	if (res) {
	544	res = -ENOMEM;
	545	goto out_err;
	546	}
	547
	548	__list_add(&alist, ascb->list.prev, &ascb->list);
	549	list_for_each_entry(a, &alist, list) {
	550	a->uldd_task = t;
	551	t->lldd_task = a;
79855d17	552	break;
2908d778 JB	553	}
	554	list_for_each_entry(a, &alist, list) {
	555	t = a->uldd_task;
	556	a->uldd_timer = 1;
5929faf3 DW	557	if (t->task_proto & SAS_PROTOCOL_STP)
5929faf3 DW	558	t->task_proto = SAS_PROTOCOL_STP;
2908d778	559	switch (t->task_proto) {
5929faf3 DW	560	case SAS_PROTOCOL_SATA:
5929faf3 DW	561	case SAS_PROTOCOL_STP:
2908d778 JB	562	res = asd_build_ata_ascb(a, t, gfp_flags);
2908d778 JB	563	break;
5929faf3	564	case SAS_PROTOCOL_SMP:
2908d778 JB	565	res = asd_build_smp_ascb(a, t, gfp_flags);
2908d778 JB	566	break;
5929faf3	567	case SAS_PROTOCOL_SSP:
2908d778 JB	568	res = asd_build_ssp_ascb(a, t, gfp_flags);
	569	break;
	570	default:
	571	asd_printk("unknown sas_task proto: 0x%x\n",
	572	t->task_proto);
	573	res = -ENOMEM;
	574	break;
	575	}
	576	if (res)
	577	goto out_err_unmap;
b218a0d8 DW	578
	579	spin_lock_irqsave(&t->task_state_lock, flags);
	580	t->task_state_flags \|= SAS_TASK_AT_INITIATOR;
	581	spin_unlock_irqrestore(&t->task_state_lock, flags);
2908d778 JB	582	}
	583	list_del_init(&alist);
	584
79855d17	585	res = asd_post_ascb_list(asd_ha, ascb, 1);
2908d778 JB	586	if (unlikely(res)) {
	587	a = NULL;
	588	__list_add(&alist, ascb->list.prev, &ascb->list);
	589	goto out_err_unmap;
	590	}
	591
	592	return 0;
	593	out_err_unmap:
	594	{
	595	struct asd_ascb *b = a;
	596	list_for_each_entry(a, &alist, list) {
	597	if (a == b)
	598	break;
	599	t = a->uldd_task;
b218a0d8 DW	600	spin_lock_irqsave(&t->task_state_lock, flags);
	601	t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
	602	spin_unlock_irqrestore(&t->task_state_lock, flags);
2908d778	603	switch (t->task_proto) {
5929faf3 DW	604	case SAS_PROTOCOL_SATA:
5929faf3 DW	605	case SAS_PROTOCOL_STP:
2908d778 JB	606	asd_unbuild_ata_ascb(a);
2908d778 JB	607	break;
5929faf3	608	case SAS_PROTOCOL_SMP:
2908d778 JB	609	asd_unbuild_smp_ascb(a);
2908d778 JB	610	break;
5929faf3	611	case SAS_PROTOCOL_SSP:
2908d778 JB	612	asd_unbuild_ssp_ascb(a);
	613	default:
	614	break;
	615	}
	616	t->lldd_task = NULL;
	617	}
	618	}
	619	list_del_init(&alist);
	620	out_err:
	621	if (ascb)
	622	asd_ascb_free_list(ascb);
79855d17	623	asd_can_dequeue(asd_ha, 1);
2908d778 JB	624	return res;
2908d778 JB	625	}