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request.c
3528 lines (2979 loc) · 102 KB
/
request.c
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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <scsi/scsi_cmnd.h>
#include "isci.h"
#include "task.h"
#include "request.h"
#include "scu_completion_codes.h"
#include "scu_event_codes.h"
#include "sas.h"
#undef C
#define C(a) (#a)
const char *req_state_name(enum sci_base_request_states state)
{
static const char * const strings[] = REQUEST_STATES;
return strings[state];
}
#undef C
static struct scu_sgl_element_pair *to_sgl_element_pair(struct isci_request *ireq,
int idx)
{
if (idx == 0)
return &ireq->tc->sgl_pair_ab;
else if (idx == 1)
return &ireq->tc->sgl_pair_cd;
else if (idx < 0)
return NULL;
else
return &ireq->sg_table[idx - 2];
}
static dma_addr_t to_sgl_element_pair_dma(struct isci_host *ihost,
struct isci_request *ireq, u32 idx)
{
u32 offset;
if (idx == 0) {
offset = (void *) &ireq->tc->sgl_pair_ab -
(void *) &ihost->task_context_table[0];
return ihost->tc_dma + offset;
} else if (idx == 1) {
offset = (void *) &ireq->tc->sgl_pair_cd -
(void *) &ihost->task_context_table[0];
return ihost->tc_dma + offset;
}
return sci_io_request_get_dma_addr(ireq, &ireq->sg_table[idx - 2]);
}
static void init_sgl_element(struct scu_sgl_element *e, struct scatterlist *sg)
{
e->length = sg_dma_len(sg);
e->address_upper = upper_32_bits(sg_dma_address(sg));
e->address_lower = lower_32_bits(sg_dma_address(sg));
e->address_modifier = 0;
}
static void sci_request_build_sgl(struct isci_request *ireq)
{
struct isci_host *ihost = ireq->isci_host;
struct sas_task *task = isci_request_access_task(ireq);
struct scatterlist *sg = NULL;
dma_addr_t dma_addr;
u32 sg_idx = 0;
struct scu_sgl_element_pair *scu_sg = NULL;
struct scu_sgl_element_pair *prev_sg = NULL;
if (task->num_scatter > 0) {
sg = task->scatter;
while (sg) {
scu_sg = to_sgl_element_pair(ireq, sg_idx);
init_sgl_element(&scu_sg->A, sg);
sg = sg_next(sg);
if (sg) {
init_sgl_element(&scu_sg->B, sg);
sg = sg_next(sg);
} else
memset(&scu_sg->B, 0, sizeof(scu_sg->B));
if (prev_sg) {
dma_addr = to_sgl_element_pair_dma(ihost,
ireq,
sg_idx);
prev_sg->next_pair_upper =
upper_32_bits(dma_addr);
prev_sg->next_pair_lower =
lower_32_bits(dma_addr);
}
prev_sg = scu_sg;
sg_idx++;
}
} else { /* handle when no sg */
scu_sg = to_sgl_element_pair(ireq, sg_idx);
dma_addr = dma_map_single(&ihost->pdev->dev,
task->scatter,
task->total_xfer_len,
task->data_dir);
ireq->zero_scatter_daddr = dma_addr;
scu_sg->A.length = task->total_xfer_len;
scu_sg->A.address_upper = upper_32_bits(dma_addr);
scu_sg->A.address_lower = lower_32_bits(dma_addr);
}
if (scu_sg) {
scu_sg->next_pair_upper = 0;
scu_sg->next_pair_lower = 0;
}
}
static void sci_io_request_build_ssp_command_iu(struct isci_request *ireq)
{
struct ssp_cmd_iu *cmd_iu;
struct sas_task *task = isci_request_access_task(ireq);
cmd_iu = &ireq->ssp.cmd;
memcpy(cmd_iu->LUN, task->ssp_task.LUN, 8);
cmd_iu->add_cdb_len = 0;
cmd_iu->_r_a = 0;
cmd_iu->_r_b = 0;
cmd_iu->en_fburst = 0; /* unsupported */
cmd_iu->task_prio = task->ssp_task.task_prio;
cmd_iu->task_attr = task->ssp_task.task_attr;
cmd_iu->_r_c = 0;
sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cmd->cmnd,
(task->ssp_task.cmd->cmd_len+3) / sizeof(u32));
}
static void sci_task_request_build_ssp_task_iu(struct isci_request *ireq)
{
struct ssp_task_iu *task_iu;
struct sas_task *task = isci_request_access_task(ireq);
struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
task_iu = &ireq->ssp.tmf;
memset(task_iu, 0, sizeof(struct ssp_task_iu));
memcpy(task_iu->LUN, task->ssp_task.LUN, 8);
task_iu->task_func = isci_tmf->tmf_code;
task_iu->task_tag =
(test_bit(IREQ_TMF, &ireq->flags)) ?
isci_tmf->io_tag :
SCI_CONTROLLER_INVALID_IO_TAG;
}
/**
* This method is will fill in the SCU Task Context for any type of SSP request.
* @sci_req:
* @task_context:
*
*/
static void scu_ssp_reqeust_construct_task_context(
struct isci_request *ireq,
struct scu_task_context *task_context)
{
dma_addr_t dma_addr;
struct isci_remote_device *idev;
struct isci_port *iport;
idev = ireq->target_device;
iport = idev->owning_port;
/* Fill in the TC with the its required data */
task_context->abort = 0;
task_context->priority = 0;
task_context->initiator_request = 1;
task_context->connection_rate = idev->connection_rate;
task_context->protocol_engine_index = ISCI_PEG;
task_context->logical_port_index = iport->physical_port_index;
task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;
task_context->remote_node_index = idev->rnc.remote_node_index;
task_context->command_code = 0;
task_context->link_layer_control = 0;
task_context->do_not_dma_ssp_good_response = 1;
task_context->strict_ordering = 0;
task_context->control_frame = 0;
task_context->timeout_enable = 0;
task_context->block_guard_enable = 0;
task_context->address_modifier = 0;
/* task_context->type.ssp.tag = ireq->io_tag; */
task_context->task_phase = 0x01;
ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
(ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(iport->physical_port_index <<
SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
ISCI_TAG_TCI(ireq->io_tag));
/*
* Copy the physical address for the command buffer to the
* SCU Task Context
*/
dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.cmd);
task_context->command_iu_upper = upper_32_bits(dma_addr);
task_context->command_iu_lower = lower_32_bits(dma_addr);
/*
* Copy the physical address for the response buffer to the
* SCU Task Context
*/
dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.rsp);
task_context->response_iu_upper = upper_32_bits(dma_addr);
task_context->response_iu_lower = lower_32_bits(dma_addr);
}
static u8 scu_bg_blk_size(struct scsi_device *sdp)
{
switch (sdp->sector_size) {
case 512:
return 0;
case 1024:
return 1;
case 4096:
return 3;
default:
return 0xff;
}
}
static u32 scu_dif_bytes(u32 len, u32 sector_size)
{
return (len >> ilog2(sector_size)) * 8;
}
static void scu_ssp_ireq_dif_insert(struct isci_request *ireq, u8 type, u8 op)
{
struct scu_task_context *tc = ireq->tc;
struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
u8 blk_sz = scu_bg_blk_size(scmd->device);
tc->block_guard_enable = 1;
tc->blk_prot_en = 1;
tc->blk_sz = blk_sz;
/* DIF write insert */
tc->blk_prot_func = 0x2;
tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
scmd->device->sector_size);
/* always init to 0, used by hw */
tc->interm_crc_val = 0;
tc->init_crc_seed = 0;
tc->app_tag_verify = 0;
tc->app_tag_gen = 0;
tc->ref_tag_seed_verify = 0;
/* always init to same as bg_blk_sz */
tc->UD_bytes_immed_val = scmd->device->sector_size;
tc->reserved_DC_0 = 0;
/* always init to 8 */
tc->DIF_bytes_immed_val = 8;
tc->reserved_DC_1 = 0;
tc->bgc_blk_sz = scmd->device->sector_size;
tc->reserved_E0_0 = 0;
tc->app_tag_gen_mask = 0;
/** setup block guard control **/
tc->bgctl = 0;
/* DIF write insert */
tc->bgctl_f.op = 0x2;
tc->app_tag_verify_mask = 0;
/* must init to 0 for hw */
tc->blk_guard_err = 0;
tc->reserved_E8_0 = 0;
if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
tc->ref_tag_seed_gen = scsi_get_lba(scmd) & 0xffffffff;
else if (type & SCSI_PROT_DIF_TYPE3)
tc->ref_tag_seed_gen = 0;
}
static void scu_ssp_ireq_dif_strip(struct isci_request *ireq, u8 type, u8 op)
{
struct scu_task_context *tc = ireq->tc;
struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
u8 blk_sz = scu_bg_blk_size(scmd->device);
tc->block_guard_enable = 1;
tc->blk_prot_en = 1;
tc->blk_sz = blk_sz;
/* DIF read strip */
tc->blk_prot_func = 0x1;
tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
scmd->device->sector_size);
/* always init to 0, used by hw */
tc->interm_crc_val = 0;
tc->init_crc_seed = 0;
tc->app_tag_verify = 0;
tc->app_tag_gen = 0;
if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
tc->ref_tag_seed_verify = scsi_get_lba(scmd) & 0xffffffff;
else if (type & SCSI_PROT_DIF_TYPE3)
tc->ref_tag_seed_verify = 0;
/* always init to same as bg_blk_sz */
tc->UD_bytes_immed_val = scmd->device->sector_size;
tc->reserved_DC_0 = 0;
/* always init to 8 */
tc->DIF_bytes_immed_val = 8;
tc->reserved_DC_1 = 0;
tc->bgc_blk_sz = scmd->device->sector_size;
tc->reserved_E0_0 = 0;
tc->app_tag_gen_mask = 0;
/** setup block guard control **/
tc->bgctl = 0;
/* DIF read strip */
tc->bgctl_f.crc_verify = 1;
tc->bgctl_f.op = 0x1;
if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2)) {
tc->bgctl_f.ref_tag_chk = 1;
tc->bgctl_f.app_f_detect = 1;
} else if (type & SCSI_PROT_DIF_TYPE3)
tc->bgctl_f.app_ref_f_detect = 1;
tc->app_tag_verify_mask = 0;
/* must init to 0 for hw */
tc->blk_guard_err = 0;
tc->reserved_E8_0 = 0;
tc->ref_tag_seed_gen = 0;
}
/**
* This method is will fill in the SCU Task Context for a SSP IO request.
* @sci_req:
*
*/
static void scu_ssp_io_request_construct_task_context(struct isci_request *ireq,
enum dma_data_direction dir,
u32 len)
{
struct scu_task_context *task_context = ireq->tc;
struct sas_task *sas_task = ireq->ttype_ptr.io_task_ptr;
struct scsi_cmnd *scmd = sas_task->uldd_task;
u8 prot_type = scsi_get_prot_type(scmd);
u8 prot_op = scsi_get_prot_op(scmd);
scu_ssp_reqeust_construct_task_context(ireq, task_context);
task_context->ssp_command_iu_length =
sizeof(struct ssp_cmd_iu) / sizeof(u32);
task_context->type.ssp.frame_type = SSP_COMMAND;
switch (dir) {
case DMA_FROM_DEVICE:
case DMA_NONE:
default:
task_context->task_type = SCU_TASK_TYPE_IOREAD;
break;
case DMA_TO_DEVICE:
task_context->task_type = SCU_TASK_TYPE_IOWRITE;
break;
}
task_context->transfer_length_bytes = len;
if (task_context->transfer_length_bytes > 0)
sci_request_build_sgl(ireq);
if (prot_type != SCSI_PROT_DIF_TYPE0) {
if (prot_op == SCSI_PROT_READ_STRIP)
scu_ssp_ireq_dif_strip(ireq, prot_type, prot_op);
else if (prot_op == SCSI_PROT_WRITE_INSERT)
scu_ssp_ireq_dif_insert(ireq, prot_type, prot_op);
}
}
/**
* This method will fill in the SCU Task Context for a SSP Task request. The
* following important settings are utilized: -# priority ==
* SCU_TASK_PRIORITY_HIGH. This ensures that the task request is issued
* ahead of other task destined for the same Remote Node. -# task_type ==
* SCU_TASK_TYPE_IOREAD. This simply indicates that a normal request type
* (i.e. non-raw frame) is being utilized to perform task management. -#
* control_frame == 1. This ensures that the proper endianess is set so
* that the bytes are transmitted in the right order for a task frame.
* @sci_req: This parameter specifies the task request object being
* constructed.
*
*/
static void scu_ssp_task_request_construct_task_context(struct isci_request *ireq)
{
struct scu_task_context *task_context = ireq->tc;
scu_ssp_reqeust_construct_task_context(ireq, task_context);
task_context->control_frame = 1;
task_context->priority = SCU_TASK_PRIORITY_HIGH;
task_context->task_type = SCU_TASK_TYPE_RAW_FRAME;
task_context->transfer_length_bytes = 0;
task_context->type.ssp.frame_type = SSP_TASK;
task_context->ssp_command_iu_length =
sizeof(struct ssp_task_iu) / sizeof(u32);
}
/**
* This method is will fill in the SCU Task Context for any type of SATA
* request. This is called from the various SATA constructors.
* @sci_req: The general IO request object which is to be used in
* constructing the SCU task context.
* @task_context: The buffer pointer for the SCU task context which is being
* constructed.
*
* The general io request construction is complete. The buffer assignment for
* the command buffer is complete. none Revisit task context construction to
* determine what is common for SSP/SMP/STP task context structures.
*/
static void scu_sata_reqeust_construct_task_context(
struct isci_request *ireq,
struct scu_task_context *task_context)
{
dma_addr_t dma_addr;
struct isci_remote_device *idev;
struct isci_port *iport;
idev = ireq->target_device;
iport = idev->owning_port;
/* Fill in the TC with the its required data */
task_context->abort = 0;
task_context->priority = SCU_TASK_PRIORITY_NORMAL;
task_context->initiator_request = 1;
task_context->connection_rate = idev->connection_rate;
task_context->protocol_engine_index = ISCI_PEG;
task_context->logical_port_index = iport->physical_port_index;
task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_STP;
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;
task_context->remote_node_index = idev->rnc.remote_node_index;
task_context->command_code = 0;
task_context->link_layer_control = 0;
task_context->do_not_dma_ssp_good_response = 1;
task_context->strict_ordering = 0;
task_context->control_frame = 0;
task_context->timeout_enable = 0;
task_context->block_guard_enable = 0;
task_context->address_modifier = 0;
task_context->task_phase = 0x01;
task_context->ssp_command_iu_length =
(sizeof(struct host_to_dev_fis) - sizeof(u32)) / sizeof(u32);
/* Set the first word of the H2D REG FIS */
task_context->type.words[0] = *(u32 *)&ireq->stp.cmd;
ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
(ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(iport->physical_port_index <<
SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
ISCI_TAG_TCI(ireq->io_tag));
/*
* Copy the physical address for the command buffer to the SCU Task
* Context. We must offset the command buffer by 4 bytes because the
* first 4 bytes are transfered in the body of the TC.
*/
dma_addr = sci_io_request_get_dma_addr(ireq,
((char *) &ireq->stp.cmd) +
sizeof(u32));
task_context->command_iu_upper = upper_32_bits(dma_addr);
task_context->command_iu_lower = lower_32_bits(dma_addr);
/* SATA Requests do not have a response buffer */
task_context->response_iu_upper = 0;
task_context->response_iu_lower = 0;
}
static void scu_stp_raw_request_construct_task_context(struct isci_request *ireq)
{
struct scu_task_context *task_context = ireq->tc;
scu_sata_reqeust_construct_task_context(ireq, task_context);
task_context->control_frame = 0;
task_context->priority = SCU_TASK_PRIORITY_NORMAL;
task_context->task_type = SCU_TASK_TYPE_SATA_RAW_FRAME;
task_context->type.stp.fis_type = FIS_REGH2D;
task_context->transfer_length_bytes = sizeof(struct host_to_dev_fis) - sizeof(u32);
}
static enum sci_status sci_stp_pio_request_construct(struct isci_request *ireq,
bool copy_rx_frame)
{
struct isci_stp_request *stp_req = &ireq->stp.req;
scu_stp_raw_request_construct_task_context(ireq);
stp_req->status = 0;
stp_req->sgl.offset = 0;
stp_req->sgl.set = SCU_SGL_ELEMENT_PAIR_A;
if (copy_rx_frame) {
sci_request_build_sgl(ireq);
stp_req->sgl.index = 0;
} else {
/* The user does not want the data copied to the SGL buffer location */
stp_req->sgl.index = -1;
}
return SCI_SUCCESS;
}
/**
*
* @sci_req: This parameter specifies the request to be constructed as an
* optimized request.
* @optimized_task_type: This parameter specifies whether the request is to be
* an UDMA request or a NCQ request. - A value of 0 indicates UDMA. - A
* value of 1 indicates NCQ.
*
* This method will perform request construction common to all types of STP
* requests that are optimized by the silicon (i.e. UDMA, NCQ). This method
* returns an indication as to whether the construction was successful.
*/
static void sci_stp_optimized_request_construct(struct isci_request *ireq,
u8 optimized_task_type,
u32 len,
enum dma_data_direction dir)
{
struct scu_task_context *task_context = ireq->tc;
/* Build the STP task context structure */
scu_sata_reqeust_construct_task_context(ireq, task_context);
/* Copy over the SGL elements */
sci_request_build_sgl(ireq);
/* Copy over the number of bytes to be transfered */
task_context->transfer_length_bytes = len;
if (dir == DMA_TO_DEVICE) {
/*
* The difference between the DMA IN and DMA OUT request task type
* values are consistent with the difference between FPDMA READ
* and FPDMA WRITE values. Add the supplied task type parameter
* to this difference to set the task type properly for this
* DATA OUT (WRITE) case. */
task_context->task_type = optimized_task_type + (SCU_TASK_TYPE_DMA_OUT
- SCU_TASK_TYPE_DMA_IN);
} else {
/*
* For the DATA IN (READ) case, simply save the supplied
* optimized task type. */
task_context->task_type = optimized_task_type;
}
}
static void sci_atapi_construct(struct isci_request *ireq)
{
struct host_to_dev_fis *h2d_fis = &ireq->stp.cmd;
struct sas_task *task;
/* To simplify the implementation we take advantage of the
* silicon's partial acceleration of atapi protocol (dma data
* transfers), so we promote all commands to dma protocol. This
* breaks compatibility with ATA_HORKAGE_ATAPI_MOD16_DMA drives.
*/
h2d_fis->features |= ATAPI_PKT_DMA;
scu_stp_raw_request_construct_task_context(ireq);
task = isci_request_access_task(ireq);
if (task->data_dir == DMA_NONE)
task->total_xfer_len = 0;
/* clear the response so we can detect arrivial of an
* unsolicited h2d fis
*/
ireq->stp.rsp.fis_type = 0;
}
static enum sci_status
sci_io_request_construct_sata(struct isci_request *ireq,
u32 len,
enum dma_data_direction dir,
bool copy)
{
enum sci_status status = SCI_SUCCESS;
struct sas_task *task = isci_request_access_task(ireq);
struct domain_device *dev = ireq->target_device->domain_dev;
/* check for management protocols */
if (test_bit(IREQ_TMF, &ireq->flags)) {
struct isci_tmf *tmf = isci_request_access_tmf(ireq);
dev_err(&ireq->owning_controller->pdev->dev,
"%s: Request 0x%p received un-handled SAT "
"management protocol 0x%x.\n",
__func__, ireq, tmf->tmf_code);
return SCI_FAILURE;
}
if (!sas_protocol_ata(task->task_proto)) {
dev_err(&ireq->owning_controller->pdev->dev,
"%s: Non-ATA protocol in SATA path: 0x%x\n",
__func__,
task->task_proto);
return SCI_FAILURE;
}
/* ATAPI */
if (dev->sata_dev.class == ATA_DEV_ATAPI &&
task->ata_task.fis.command == ATA_CMD_PACKET) {
sci_atapi_construct(ireq);
return SCI_SUCCESS;
}
/* non data */
if (task->data_dir == DMA_NONE) {
scu_stp_raw_request_construct_task_context(ireq);
return SCI_SUCCESS;
}
/* NCQ */
if (task->ata_task.use_ncq) {
sci_stp_optimized_request_construct(ireq,
SCU_TASK_TYPE_FPDMAQ_READ,
len, dir);
return SCI_SUCCESS;
}
/* DMA */
if (task->ata_task.dma_xfer) {
sci_stp_optimized_request_construct(ireq,
SCU_TASK_TYPE_DMA_IN,
len, dir);
return SCI_SUCCESS;
} else /* PIO */
return sci_stp_pio_request_construct(ireq, copy);
return status;
}
static enum sci_status sci_io_request_construct_basic_ssp(struct isci_request *ireq)
{
struct sas_task *task = isci_request_access_task(ireq);
ireq->protocol = SAS_PROTOCOL_SSP;
scu_ssp_io_request_construct_task_context(ireq,
task->data_dir,
task->total_xfer_len);
sci_io_request_build_ssp_command_iu(ireq);
sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
return SCI_SUCCESS;
}
enum sci_status sci_task_request_construct_ssp(
struct isci_request *ireq)
{
/* Construct the SSP Task SCU Task Context */
scu_ssp_task_request_construct_task_context(ireq);
/* Fill in the SSP Task IU */
sci_task_request_build_ssp_task_iu(ireq);
sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
return SCI_SUCCESS;
}
static enum sci_status sci_io_request_construct_basic_sata(struct isci_request *ireq)
{
enum sci_status status;
bool copy = false;
struct sas_task *task = isci_request_access_task(ireq);
ireq->protocol = SAS_PROTOCOL_STP;
copy = (task->data_dir == DMA_NONE) ? false : true;
status = sci_io_request_construct_sata(ireq,
task->total_xfer_len,
task->data_dir,
copy);
if (status == SCI_SUCCESS)
sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
return status;
}
/**
* sci_req_tx_bytes - bytes transferred when reply underruns request
* @ireq: request that was terminated early
*/
#define SCU_TASK_CONTEXT_SRAM 0x200000
static u32 sci_req_tx_bytes(struct isci_request *ireq)
{
struct isci_host *ihost = ireq->owning_controller;
u32 ret_val = 0;
if (readl(&ihost->smu_registers->address_modifier) == 0) {
void __iomem *scu_reg_base = ihost->scu_registers;
/* get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where
* BAR1 is the scu_registers
* 0x20002C = 0x200000 + 0x2c
* = start of task context SRAM + offset of (type.ssp.data_offset)
* TCi is the io_tag of struct sci_request
*/
ret_val = readl(scu_reg_base +
(SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
((sizeof(struct scu_task_context)) * ISCI_TAG_TCI(ireq->io_tag)));
}
return ret_val;
}
enum sci_status sci_request_start(struct isci_request *ireq)
{
enum sci_base_request_states state;
struct scu_task_context *tc = ireq->tc;
struct isci_host *ihost = ireq->owning_controller;
state = ireq->sm.current_state_id;
if (state != SCI_REQ_CONSTRUCTED) {
dev_warn(&ihost->pdev->dev,
"%s: SCIC IO Request requested to start while in wrong "
"state %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
tc->task_index = ISCI_TAG_TCI(ireq->io_tag);
switch (tc->protocol_type) {
case SCU_TASK_CONTEXT_PROTOCOL_SMP:
case SCU_TASK_CONTEXT_PROTOCOL_SSP:
/* SSP/SMP Frame */
tc->type.ssp.tag = ireq->io_tag;
tc->type.ssp.target_port_transfer_tag = 0xFFFF;
break;
case SCU_TASK_CONTEXT_PROTOCOL_STP:
/* STP/SATA Frame
* tc->type.stp.ncq_tag = ireq->ncq_tag;
*/
break;
case SCU_TASK_CONTEXT_PROTOCOL_NONE:
/* / @todo When do we set no protocol type? */
break;
default:
/* This should never happen since we build the IO
* requests */
break;
}
/* Add to the post_context the io tag value */
ireq->post_context |= ISCI_TAG_TCI(ireq->io_tag);
/* Everything is good go ahead and change state */
sci_change_state(&ireq->sm, SCI_REQ_STARTED);
return SCI_SUCCESS;
}
enum sci_status
sci_io_request_terminate(struct isci_request *ireq)
{
enum sci_base_request_states state;
state = ireq->sm.current_state_id;
switch (state) {
case SCI_REQ_CONSTRUCTED:
/* Set to make sure no HW terminate posting is done: */
set_bit(IREQ_TC_ABORT_POSTED, &ireq->flags);
ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
return SCI_SUCCESS;
case SCI_REQ_STARTED:
case SCI_REQ_TASK_WAIT_TC_COMP:
case SCI_REQ_SMP_WAIT_RESP:
case SCI_REQ_SMP_WAIT_TC_COMP:
case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
case SCI_REQ_STP_UDMA_WAIT_D2H:
case SCI_REQ_STP_NON_DATA_WAIT_H2D:
case SCI_REQ_STP_NON_DATA_WAIT_D2H:
case SCI_REQ_STP_PIO_WAIT_H2D:
case SCI_REQ_STP_PIO_WAIT_FRAME:
case SCI_REQ_STP_PIO_DATA_IN:
case SCI_REQ_STP_PIO_DATA_OUT:
case SCI_REQ_ATAPI_WAIT_H2D:
case SCI_REQ_ATAPI_WAIT_PIO_SETUP:
case SCI_REQ_ATAPI_WAIT_D2H:
case SCI_REQ_ATAPI_WAIT_TC_COMP:
/* Fall through and change state to ABORTING... */
case SCI_REQ_TASK_WAIT_TC_RESP:
/* The task frame was already confirmed to have been
* sent by the SCU HW. Since the state machine is
* now only waiting for the task response itself,
* abort the request and complete it immediately
* and don't wait for the task response.
*/
sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
/* Fall through and handle like ABORTING... */
case SCI_REQ_ABORTING:
if (!isci_remote_device_is_safe_to_abort(ireq->target_device))
set_bit(IREQ_PENDING_ABORT, &ireq->flags);
else
clear_bit(IREQ_PENDING_ABORT, &ireq->flags);
/* If the request is only waiting on the remote device
* suspension, return SUCCESS so the caller will wait too.
*/
return SCI_SUCCESS;
case SCI_REQ_COMPLETED:
default:
dev_warn(&ireq->owning_controller->pdev->dev,
"%s: SCIC IO Request requested to abort while in wrong "
"state %d\n", __func__, ireq->sm.current_state_id);
break;
}
return SCI_FAILURE_INVALID_STATE;
}
enum sci_status sci_request_complete(struct isci_request *ireq)
{
enum sci_base_request_states state;
struct isci_host *ihost = ireq->owning_controller;
state = ireq->sm.current_state_id;
if (WARN_ONCE(state != SCI_REQ_COMPLETED,
"isci: request completion from wrong state (%s)\n",
req_state_name(state)))
return SCI_FAILURE_INVALID_STATE;
if (ireq->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX)
sci_controller_release_frame(ihost,
ireq->saved_rx_frame_index);
/* XXX can we just stop the machine and remove the 'final' state? */
sci_change_state(&ireq->sm, SCI_REQ_FINAL);
return SCI_SUCCESS;
}
enum sci_status sci_io_request_event_handler(struct isci_request *ireq,
u32 event_code)
{
enum sci_base_request_states state;
struct isci_host *ihost = ireq->owning_controller;
state = ireq->sm.current_state_id;
if (state != SCI_REQ_STP_PIO_DATA_IN) {
dev_warn(&ihost->pdev->dev, "%s: (%x) in wrong state %s\n",
__func__, event_code, req_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
switch (scu_get_event_specifier(event_code)) {
case SCU_TASK_DONE_CRC_ERR << SCU_EVENT_SPECIFIC_CODE_SHIFT:
/* We are waiting for data and the SCU has R_ERR the data frame.
* Go back to waiting for the D2H Register FIS
*/
sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
return SCI_SUCCESS;
default:
dev_err(&ihost->pdev->dev,
"%s: pio request unexpected event %#x\n",
__func__, event_code);
/* TODO Should we fail the PIO request when we get an
* unexpected event?
*/
return SCI_FAILURE;
}
}
/*
* This function copies response data for requests returning response data
* instead of sense data.
* @sci_req: This parameter specifies the request object for which to copy
* the response data.
*/
static void sci_io_request_copy_response(struct isci_request *ireq)
{
void *resp_buf;
u32 len;
struct ssp_response_iu *ssp_response;
struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
ssp_response = &ireq->ssp.rsp;
resp_buf = &isci_tmf->resp.resp_iu;
len = min_t(u32,
SSP_RESP_IU_MAX_SIZE,
be32_to_cpu(ssp_response->response_data_len));
memcpy(resp_buf, ssp_response->resp_data, len);
}
static enum sci_status
request_started_state_tc_event(struct isci_request *ireq,
u32 completion_code)
{
struct ssp_response_iu *resp_iu;