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linux-next/drivers/scsi/aic94xx/aic94xx_task.c
Linus Torvalds 4e8790f77f Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 
Pull libata changes from Tejun Heo:
 "The only interesting piece is the support for shingled drives.  The
  changes in libata layer are minimal.  All it does is identifying the
  new class of device and report upwards accordingly"

* 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  libata: Remove FIXME comment in atapi_request_sense()
  sata_rcar: Document deprecated "renesas,rcar-sata"
  sata_rcar: Add clocks to sata_rcar bindings
  ahci_sunxi: Make AHCI_HFLAG_NO_PMP flag configurable with a module option
  libata-scsi: Update SATL for ZAC drives
  libata: Implement ATA_DEV_ZAC
  libsas: use ata_dev_classify()
2014-12-11 18:52:37 -08:00

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/*
* Aic94xx SAS/SATA Tasks
*
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
*
* This file is licensed under GPLv2.
*
* This file is part of the aic94xx driver.
*
* The aic94xx driver 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; version 2 of the
* License.
*
* The aic94xx driver 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 the aic94xx driver; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#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);
}
/* PCI_DMA_... to our direction translation.
*/
static const u8 data_dir_flags[] = {
[PCI_DMA_BIDIRECTIONAL] = DATA_DIR_BYRECIPIENT, /* UNSPECIFIED */
[PCI_DMA_TODEVICE] = DATA_DIR_OUT, /* OUTBOUND */
[PCI_DMA_FROMDEVICE] = DATA_DIR_IN, /* INBOUND */
[PCI_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 == PCI_DMA_NONE)
return 0;
if (task->num_scatter == 0) {
void *p = task->scatter;
dma_addr_t dma = pci_map_single(asd_ha->pcidev, 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 = pci_map_sg(asd_ha->pcidev, 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))
pci_unmap_sg(asd_ha->pcidev, 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 == PCI_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);
pci_unmap_single(ascb->ha->pcidev, dma, task->total_xfer_len,
task->data_dir);
return;
}
asd_free_coherent(asd_ha, ascb->sg_arr);
if (task->task_proto != SAS_PROTOCOL_STP)
pci_unmap_sg(asd_ha->pcidev, 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;
pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
PCI_DMA_TODEVICE);
pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
PCI_DMA_FROMDEVICE);
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);
pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
PCI_DMA_TODEVICE);
pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
PCI_DMA_FROMDEVICE);
}
/* ---------- 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;
}
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