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-rw-r--r--drivers/scsi/isci/request.c3391
1 files changed, 3391 insertions, 0 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
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index 000000000000..a46e07ac789f
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+++ b/drivers/scsi/isci/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 "isci.h"
+#include "task.h"
+#include "request.h"
+#include "scu_completion_codes.h"
+#include "scu_event_codes.h"
+#include "sas.h"
+
+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->task_context_dma + offset;
+ } else if (idx == 1) {
+ offset = (void *) &ireq->tc->sgl_pair_cd -
+ (void *) &ihost->task_context_table[0];
+ return ihost->task_context_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.cdb,
+ sizeof(task->ssp_task.cdb) / 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 =
+ (ireq->ttype == tmf_task) ?
+ 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);
+}
+
+/**
+ * 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;
+
+ 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);
+}
+
+/**
+ * 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 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);
+
+ /* check for management protocols */
+ if (ireq->ttype == tmf_task) {
+ struct isci_tmf *tmf = isci_request_access_tmf(ireq);
+
+ if (tmf->tmf_code == isci_tmf_sata_srst_high ||
+ tmf->tmf_code == isci_tmf_sata_srst_low) {
+ scu_stp_raw_request_construct_task_context(ireq);
+ return SCI_SUCCESS;
+ } else {
+ 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;
+
+ }
+
+ /* 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 = SCIC_SSP_PROTOCOL;
+
+ 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 = SCIC_STP_PROTOCOL;
+
+ 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;
+}
+
+enum sci_status sci_task_request_construct_sata(struct isci_request *ireq)
+{
+ enum sci_status status = SCI_SUCCESS;
+
+ /* check for management protocols */
+ if (ireq->ttype == tmf_task) {
+ struct isci_tmf *tmf = isci_request_access_tmf(ireq);
+
+ if (tmf->tmf_code == isci_tmf_sata_srst_high ||
+ tmf->tmf_code == isci_tmf_sata_srst_low) {
+ scu_stp_raw_request_construct_task_context(ireq);
+ } else {
+ dev_err(&ireq->owning_controller->pdev->dev,
+ "%s: Request 0x%p received un-handled SAT "
+ "Protocol 0x%x.\n",
+ __func__, ireq, tmf->tmf_code);
+
+ return SCI_FAILURE;
+ }
+ }
+
+ if (status != SCI_SUCCESS)
+ return status;
+ sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
+
+ return status;
+}
+
+/**
+ * sci_req_tx_bytes - bytes transferred when reply underruns request
+ * @sci_req: 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:
+ 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_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
+ case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
+ case SCI_REQ_STP_SOFT_RESET_WAIT_D2H:
+ sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
+ return SCI_SUCCESS;
+ case SCI_REQ_TASK_WAIT_TC_RESP:
+ sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ return SCI_SUCCESS;
+ case SCI_REQ_ABORTING:
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ 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 (%d)\n", 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 %d\n",
+ __func__, event_code, 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;
+ u8 datapres;
+
+ /* TODO: Any SDMA return code of other than 0 is bad decode 0x003C0000
+ * to determine SDMA status
+ */
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ break;
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP): {
+ /* There are times when the SCU hardware will return an early
+ * response because the io request specified more data than is
+ * returned by the target device (mode pages, inquiry data,
+ * etc.). We must check the response stats to see if this is
+ * truly a failed request or a good request that just got
+ * completed early.
+ */
+ struct ssp_response_iu *resp = &ireq->ssp.rsp;
+ ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
+
+ sci_swab32_cpy(&ireq->ssp.rsp,
+ &ireq->ssp.rsp,
+ word_cnt);
+
+ if (resp->status == 0) {
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS_IO_DONE_EARLY;
+ } else {
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ }
+ break;
+ }
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE): {
+ ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
+
+ sci_swab32_cpy(&ireq->ssp.rsp,
+ &ireq->ssp.rsp,
+ word_cnt);
+
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ break;
+ }
+
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR):
+ /* TODO With TASK_DONE_RESP_LEN_ERR is the response frame
+ * guaranteed to be received before this completion status is
+ * posted?
+ */
+ resp_iu = &ireq->ssp.rsp;
+ datapres = resp_iu->datapres;
+
+ if (datapres == 1 || datapres == 2) {
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ } else {
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ }
+ break;
+ /* only stp device gets suspended. */
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR):
+ if (ireq->protocol == SCIC_STP_PROTOCOL) {
+ ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
+ SCU_COMPLETION_TL_STATUS_SHIFT;
+ ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
+ } else {
+ ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
+ SCU_COMPLETION_TL_STATUS_SHIFT;
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ }
+ break;
+
+ /* both stp/ssp device gets suspended */
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED):
+ ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
+ SCU_COMPLETION_TL_STATUS_SHIFT;
+ ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
+ break;
+
+ /* neither ssp nor stp gets suspended. */
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND):
+ default:
+ ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
+ SCU_COMPLETION_TL_STATUS_SHIFT;
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ break;
+ }
+
+ /*
+ * TODO: This is probably wrong for ACK/NAK timeout conditions
+ */
+
+ /* In all cases we will treat this as the completion of the IO req. */
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ return SCI_SUCCESS;
+}
+
+static enum sci_status
+request_aborting_state_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
+ case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT):
+ ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
+ ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+
+ default:
+ /* Unless we get some strange error wait for the task abort to complete
+ * TODO: Should there be a state change for this completion?
+ */
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static enum sci_status ssp_task_request_await_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
+ break;
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
+ /* Currently, the decision is to simply allow the task request
+ * to timeout if the task IU wasn't received successfully.
+ * There is a potential for receiving multiple task responses if
+ * we decide to send the task IU again.
+ */
+ dev_warn(&ireq->owning_controller->pdev->dev,
+ "%s: TaskRequest:0x%p CompletionCode:%x - "
+ "ACK/NAK timeout\n", __func__, ireq,
+ completion_code);
+
+ sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
+ break;
+ default:
+ /*
+ * All other completion status cause the IO to be complete.
+ * If a NAK was received, then it is up to the user to retry
+ * the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static enum sci_status
+smp_request_await_response_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ /* In the AWAIT RESPONSE state, any TC completion is
+ * unexpected. but if the TC has success status, we
+ * complete the IO anyway.
+ */
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
+ /* These status has been seen in a specific LSI
+ * expander, which sometimes is not able to send smp
+ * response within 2 ms. This causes our hardware break
+ * the connection and set TC completion with one of
+ * these SMP_XXX_XX_ERR status. For these type of error,
+ * we ask ihost user to retry the request.
+ */
+ ireq->scu_status = SCU_TASK_DONE_SMP_RESP_TO_ERR;
+ ireq->sci_status = SCI_FAILURE_RETRY_REQUIRED;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ default:
+ /* All other completion status cause the IO to be complete. If a NAK
+ * was received, then it is up to the user to retry the request
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static enum sci_status
+smp_request_await_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ default:
+ /* All other completion status cause the IO to be
+ * complete. If a NAK was received, then it is up to
+ * the user to retry the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static struct scu_sgl_element *pio_sgl_next(struct isci_stp_request *stp_req)
+{
+ struct scu_sgl_element *sgl;
+ struct scu_sgl_element_pair *sgl_pair;
+ struct isci_request *ireq = to_ireq(stp_req);
+ struct isci_stp_pio_sgl *pio_sgl = &stp_req->sgl;
+
+ sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
+ if (!sgl_pair)
+ sgl = NULL;
+ else if (pio_sgl->set == SCU_SGL_ELEMENT_PAIR_A) {
+ if (sgl_pair->B.address_lower == 0 &&
+ sgl_pair->B.address_upper == 0) {
+ sgl = NULL;
+ } else {
+ pio_sgl->set = SCU_SGL_ELEMENT_PAIR_B;
+ sgl = &sgl_pair->B;
+ }
+ } else {
+ if (sgl_pair->next_pair_lower == 0 &&
+ sgl_pair->next_pair_upper == 0) {
+ sgl = NULL;
+ } else {
+ pio_sgl->index++;
+ pio_sgl->set = SCU_SGL_ELEMENT_PAIR_A;
+ sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
+ sgl = &sgl_pair->A;
+ }
+ }
+
+ return sgl;
+}
+
+static enum sci_status
+stp_request_non_data_await_h2d_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_STP_NON_DATA_WAIT_D2H);
+ break;
+
+ default:
+ /* All other completion status cause the IO to be
+ * complete. If a NAK was received, then it is up to
+ * the user to retry the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+#define SCU_MAX_FRAME_BUFFER_SIZE 0x400 /* 1K is the maximum SCU frame data payload */
+
+/* transmit DATA_FIS from (current sgl + offset) for input
+ * parameter length. current sgl and offset is alreay stored in the IO request
+ */
+static enum sci_status sci_stp_request_pio_data_out_trasmit_data_frame(
+ struct isci_request *ireq,
+ u32 length)
+{
+ struct isci_stp_request *stp_req = &ireq->stp.req;
+ struct scu_task_context *task_context = ireq->tc;
+ struct scu_sgl_element_pair *sgl_pair;
+ struct scu_sgl_element *current_sgl;
+
+ /* Recycle the TC and reconstruct it for sending out DATA FIS containing
+ * for the data from current_sgl+offset for the input length
+ */
+ sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
+ if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A)
+ current_sgl = &sgl_pair->A;
+ else
+ current_sgl = &sgl_pair->B;
+
+ /* update the TC */
+ task_context->command_iu_upper = current_sgl->address_upper;
+ task_context->command_iu_lower = current_sgl->address_lower;
+ task_context->transfer_length_bytes = length;
+ task_context->type.stp.fis_type = FIS_DATA;
+
+ /* send the new TC out. */
+ return sci_controller_continue_io(ireq);
+}
+
+static enum sci_status sci_stp_request_pio_data_out_transmit_data(struct isci_request *ireq)
+{
+ struct isci_stp_request *stp_req = &ireq->stp.req;
+ struct scu_sgl_element_pair *sgl_pair;
+ struct scu_sgl_element *sgl;
+ enum sci_status status;
+ u32 offset;
+ u32 len = 0;
+
+ offset = stp_req->sgl.offset;
+ sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
+ if (WARN_ONCE(!sgl_pair, "%s: null sgl element", __func__))
+ return SCI_FAILURE;
+
+ if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A) {
+ sgl = &sgl_pair->A;
+ len = sgl_pair->A.length - offset;
+ } else {
+ sgl = &sgl_pair->B;
+ len = sgl_pair->B.length - offset;
+ }
+
+ if (stp_req->pio_len == 0)
+ return SCI_SUCCESS;
+
+ if (stp_req->pio_len >= len) {
+ status = sci_stp_request_pio_data_out_trasmit_data_frame(ireq, len);
+ if (status != SCI_SUCCESS)
+ return status;
+ stp_req->pio_len -= len;
+
+ /* update the current sgl, offset and save for future */
+ sgl = pio_sgl_next(stp_req);
+ offset = 0;
+ } else if (stp_req->pio_len < len) {
+ sci_stp_request_pio_data_out_trasmit_data_frame(ireq, stp_req->pio_len);
+
+ /* Sgl offset will be adjusted and saved for future */
+ offset += stp_req->pio_len;
+ sgl->address_lower += stp_req->pio_len;
+ stp_req->pio_len = 0;
+ }
+
+ stp_req->sgl.offset = offset;
+
+ return status;
+}
+
+/**
+ *
+ * @stp_request: The request that is used for the SGL processing.
+ * @data_buffer: The buffer of data to be copied.
+ * @length: The length of the data transfer.
+ *
+ * Copy the data from the buffer for the length specified to the IO reqeust SGL
+ * specified data region. enum sci_status
+ */
+static enum sci_status
+sci_stp_request_pio_data_in_copy_data_buffer(struct isci_stp_request *stp_req,
+ u8 *data_buf, u32 len)
+{
+ struct isci_request *ireq;
+ u8 *src_addr;
+ int copy_len;
+ struct sas_task *task;
+ struct scatterlist *sg;
+ void *kaddr;
+ int total_len = len;
+
+ ireq = to_ireq(stp_req);
+ task = isci_request_access_task(ireq);
+ src_addr = data_buf;
+
+ if (task->num_scatter > 0) {
+ sg = task->scatter;
+
+ while (total_len > 0) {
+ struct page *page = sg_page(sg);
+
+ copy_len = min_t(int, total_len, sg_dma_len(sg));
+ kaddr = kmap_atomic(page, KM_IRQ0);
+ memcpy(kaddr + sg->offset, src_addr, copy_len);
+ kunmap_atomic(kaddr, KM_IRQ0);
+ total_len -= copy_len;
+ src_addr += copy_len;
+ sg = sg_next(sg);
+ }
+ } else {
+ BUG_ON(task->total_xfer_len < total_len);
+ memcpy(task->scatter, src_addr, total_len);
+ }
+
+ return SCI_SUCCESS;
+}
+
+/**
+ *
+ * @sci_req: The PIO DATA IN request that is to receive the data.
+ * @data_buffer: The buffer to copy from.
+ *
+ * Copy the data buffer to the io request data region. enum sci_status
+ */
+static enum sci_status sci_stp_request_pio_data_in_copy_data(
+ struct isci_stp_request *stp_req,
+ u8 *data_buffer)
+{
+ enum sci_status status;
+
+ /*
+ * If there is less than 1K remaining in the transfer request
+ * copy just the data for the transfer */
+ if (stp_req->pio_len < SCU_MAX_FRAME_BUFFER_SIZE) {
+ status = sci_stp_request_pio_data_in_copy_data_buffer(
+ stp_req, data_buffer, stp_req->pio_len);
+
+ if (status == SCI_SUCCESS)
+ stp_req->pio_len = 0;
+ } else {
+ /* We are transfering the whole frame so copy */
+ status = sci_stp_request_pio_data_in_copy_data_buffer(
+ stp_req, data_buffer, SCU_MAX_FRAME_BUFFER_SIZE);
+
+ if (status == SCI_SUCCESS)
+ stp_req->pio_len -= SCU_MAX_FRAME_BUFFER_SIZE;
+ }
+
+ return status;
+}
+
+static enum sci_status
+stp_request_pio_await_h2d_completion_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ enum sci_status status = SCI_SUCCESS;
+
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
+ break;
+
+ default:
+ /* All other completion status cause the IO to be
+ * complete. If a NAK was received, then it is up to
+ * the user to retry the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return status;
+}
+
+static enum sci_status
+pio_data_out_tx_done_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ enum sci_status status = SCI_SUCCESS;
+ bool all_frames_transferred = false;
+ struct isci_stp_request *stp_req = &ireq->stp.req;
+
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ /* Transmit data */
+ if (stp_req->pio_len != 0) {
+ status = sci_stp_request_pio_data_out_transmit_data(ireq);
+ if (status == SCI_SUCCESS) {
+ if (stp_req->pio_len == 0)
+ all_frames_transferred = true;
+ }
+ } else if (stp_req->pio_len == 0) {
+ /*
+ * this will happen if the all data is written at the
+ * first time after the pio setup fis is received
+ */
+ all_frames_transferred = true;
+ }
+
+ /* all data transferred. */
+ if (all_frames_transferred) {
+ /*
+ * Change the state to SCI_REQ_STP_PIO_DATA_IN
+ * and wait for PIO_SETUP fis / or D2H REg fis. */
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
+ }
+ break;
+
+ default:
+ /*
+ * All other completion status cause the IO to be complete.
+ * If a NAK was received, then it is up to the user to retry
+ * the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return status;
+}
+
+static enum sci_status sci_stp_request_udma_general_frame_handler(struct isci_request *ireq,
+ u32 frame_index)
+{
+ struct isci_host *ihost = ireq->owning_controller;
+ struct dev_to_host_fis *frame_header;
+ enum sci_status status;
+ u32 *frame_buffer;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_header);
+
+ if ((status == SCI_SUCCESS) &&
+ (frame_header->fis_type == FIS_REGD2H)) {
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ sci_controller_copy_sata_response(&ireq->stp.rsp,
+ frame_header,
+ frame_buffer);
+ }
+
+ sci_controller_release_frame(ihost, frame_index);
+
+ return status;
+}
+
+enum sci_status
+sci_io_request_frame_handler(struct isci_request *ireq,
+ u32 frame_index)
+{
+ struct isci_host *ihost = ireq->owning_controller;
+ struct isci_stp_request *stp_req = &ireq->stp.req;
+ enum sci_base_request_states state;
+ enum sci_status status;
+ ssize_t word_cnt;
+
+ state = ireq->sm.current_state_id;
+ switch (state) {
+ case SCI_REQ_STARTED: {
+ struct ssp_frame_hdr ssp_hdr;
+ void *frame_header;
+
+ sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ &frame_header);
+
+ word_cnt = sizeof(struct ssp_frame_hdr) / sizeof(u32);
+ sci_swab32_cpy(&ssp_hdr, frame_header, word_cnt);
+
+ if (ssp_hdr.frame_type == SSP_RESPONSE) {
+ struct ssp_response_iu *resp_iu;
+ ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
+
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&resp_iu);
+
+ sci_swab32_cpy(&ireq->ssp.rsp, resp_iu, word_cnt);
+
+ resp_iu = &ireq->ssp.rsp;
+
+ if (resp_iu->datapres == 0x01 ||
+ resp_iu->datapres == 0x02) {
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ } else {
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ }
+ } else {
+ /* not a response frame, why did it get forwarded? */
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC IO Request 0x%p received unexpected "
+ "frame %d type 0x%02x\n", __func__, ireq,
+ frame_index, ssp_hdr.frame_type);
+ }
+
+ /*
+ * In any case we are done with this frame buffer return it to
+ * the controller
+ */
+ sci_controller_release_frame(ihost, frame_index);
+
+ return SCI_SUCCESS;
+ }
+
+ case SCI_REQ_TASK_WAIT_TC_RESP:
+ sci_io_request_copy_response(ireq);
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ sci_controller_release_frame(ihost, frame_index);
+ return SCI_SUCCESS;
+
+ case SCI_REQ_SMP_WAIT_RESP: {
+ struct smp_resp *rsp_hdr = &ireq->smp.rsp;
+ void *frame_header;
+
+ sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ &frame_header);
+
+ /* byte swap the header. */
+ word_cnt = SMP_RESP_HDR_SZ / sizeof(u32);
+ sci_swab32_cpy(rsp_hdr, frame_header, word_cnt);
+
+ if (rsp_hdr->frame_type == SMP_RESPONSE) {
+ void *smp_resp;
+
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ &smp_resp);
+
+ word_cnt = (sizeof(struct smp_resp) - SMP_RESP_HDR_SZ) /
+ sizeof(u32);
+
+ sci_swab32_cpy(((u8 *) rsp_hdr) + SMP_RESP_HDR_SZ,
+ smp_resp, word_cnt);
+
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_SMP_WAIT_TC_COMP);
+ } else {
+ /*
+ * This was not a response frame why did it get
+ * forwarded?
+ */
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC SMP Request 0x%p received unexpected "
+ "frame %d type 0x%02x\n",
+ __func__,
+ ireq,
+ frame_index,
+ rsp_hdr->frame_type);
+
+ ireq->scu_status = SCU_TASK_DONE_SMP_FRM_TYPE_ERR;
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ }
+
+ sci_controller_release_frame(ihost, frame_index);
+
+ return SCI_SUCCESS;
+ }
+
+ case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
+ return sci_stp_request_udma_general_frame_handler(ireq,
+ frame_index);
+
+ case SCI_REQ_STP_UDMA_WAIT_D2H:
+ /* Use the general frame handler to copy the resposne data */
+ status = sci_stp_request_udma_general_frame_handler(ireq, frame_index);
+
+ if (status != SCI_SUCCESS)
+ return status;
+
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ return SCI_SUCCESS;
+
+ case SCI_REQ_STP_NON_DATA_WAIT_D2H: {
+ struct dev_to_host_fis *frame_header;
+ u32 *frame_buffer;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_header);
+
+ if (status != SCI_SUCCESS) {
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC IO Request 0x%p could not get frame "
+ "header for frame index %d, status %x\n",
+ __func__,
+ stp_req,
+ frame_index,
+ status);
+
+ return status;
+ }
+
+ switch (frame_header->fis_type) {
+ case FIS_REGD2H:
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ sci_controller_copy_sata_response(&ireq->stp.rsp,
+ frame_header,
+ frame_buffer);
+
+ /* The command has completed with error */
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ break;
+
+ default:
+ dev_warn(&ihost->pdev->dev,
+ "%s: IO Request:0x%p Frame Id:%d protocol "
+ "violation occurred\n", __func__, stp_req,
+ frame_index);
+
+ ireq->scu_status = SCU_TASK_DONE_UNEXP_FIS;
+ ireq->sci_status = SCI_FAILURE_PROTOCOL_VIOLATION;
+ break;
+ }
+
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+
+ /* Frame has been decoded return it to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+
+ return status;
+ }
+
+ case SCI_REQ_STP_PIO_WAIT_FRAME: {
+ struct sas_task *task = isci_request_access_task(ireq);
+ struct dev_to_host_fis *frame_header;
+ u32 *frame_buffer;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_header);
+
+ if (status != SCI_SUCCESS) {
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC IO Request 0x%p could not get frame "
+ "header for frame index %d, status %x\n",
+ __func__, stp_req, frame_index, status);
+ return status;
+ }
+
+ switch (frame_header->fis_type) {
+ case FIS_PIO_SETUP:
+ /* Get from the frame buffer the PIO Setup Data */
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ /* Get the data from the PIO Setup The SCU Hardware
+ * returns first word in the frame_header and the rest
+ * of the data is in the frame buffer so we need to
+ * back up one dword
+ */
+
+ /* transfer_count: first 16bits in the 4th dword */
+ stp_req->pio_len = frame_buffer[3] & 0xffff;
+
+ /* status: 4th byte in the 3rd dword */
+ stp_req->status = (frame_buffer[2] >> 24) & 0xff;
+
+ sci_controller_copy_sata_response(&ireq->stp.rsp,
+ frame_header,
+ frame_buffer);
+
+ ireq->stp.rsp.status = stp_req->status;
+
+ /* The next state is dependent on whether the
+ * request was PIO Data-in or Data out
+ */
+ if (task->data_dir == DMA_FROM_DEVICE) {
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_IN);
+ } else if (task->data_dir == DMA_TO_DEVICE) {
+ /* Transmit data */
+ status = sci_stp_request_pio_data_out_transmit_data(ireq);
+ if (status != SCI_SUCCESS)
+ break;
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_OUT);
+ }
+ break;
+
+ case FIS_SETDEVBITS:
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
+ break;
+
+ case FIS_REGD2H:
+ if (frame_header->status & ATA_BUSY) {
+ /*
+ * Now why is the drive sending a D2H Register
+ * FIS when it is still busy? Do nothing since
+ * we are still in the right state.
+ */
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SCIC PIO Request 0x%p received "
+ "D2H Register FIS with BSY status "
+ "0x%x\n",
+ __func__,
+ stp_req,
+ frame_header->status);
+ break;
+ }
+
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ sci_controller_copy_sata_response(&ireq->stp.req,
+ frame_header,
+ frame_buffer);
+
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+
+ default:
+ /* FIXME: what do we do here? */
+ break;
+ }
+
+ /* Frame is decoded return it to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+
+ return status;
+ }
+
+ case SCI_REQ_STP_PIO_DATA_IN: {
+ struct dev_to_host_fis *frame_header;
+ struct sata_fis_data *frame_buffer;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_header);
+
+ if (status != SCI_SUCCESS) {
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC IO Request 0x%p could not get frame "
+ "header for frame index %d, status %x\n",
+ __func__,
+ stp_req,
+ frame_index,
+ status);
+ return status;
+ }
+
+ if (frame_header->fis_type != FIS_DATA) {
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC PIO Request 0x%p received frame %d "
+ "with fis type 0x%02x when expecting a data "
+ "fis.\n",
+ __func__,
+ stp_req,
+ frame_index,
+ frame_header->fis_type);
+
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_FAILURE_IO_REQUIRES_SCSI_ABORT;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+
+ /* Frame is decoded return it to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+ return status;
+ }
+
+ if (stp_req->sgl.index < 0) {
+ ireq->saved_rx_frame_index = frame_index;
+ stp_req->pio_len = 0;
+ } else {
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ status = sci_stp_request_pio_data_in_copy_data(stp_req,
+ (u8 *)frame_buffer);
+
+ /* Frame is decoded return it to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+ }
+
+ /* Check for the end of the transfer, are there more
+ * bytes remaining for this data transfer
+ */
+ if (status != SCI_SUCCESS || stp_req->pio_len != 0)
+ return status;
+
+ if ((stp_req->status & ATA_BUSY) == 0) {
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ } else {
+ sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
+ }
+ return status;
+ }
+
+ case SCI_REQ_STP_SOFT_RESET_WAIT_D2H: {
+ struct dev_to_host_fis *frame_header;
+ u32 *frame_buffer;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_header);
+ if (status != SCI_SUCCESS) {
+ dev_err(&ihost->pdev->dev,
+ "%s: SCIC IO Request 0x%p could not get frame "
+ "header for frame index %d, status %x\n",
+ __func__,
+ stp_req,
+ frame_index,
+ status);
+ return status;
+ }
+
+ switch (frame_header->fis_type) {
+ case FIS_REGD2H:
+ sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
+ frame_index,
+ (void **)&frame_buffer);
+
+ sci_controller_copy_sata_response(&ireq->stp.rsp,
+ frame_header,
+ frame_buffer);
+
+ /* The command has completed with error */
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ break;
+
+ default:
+ dev_warn(&ihost->pdev->dev,
+ "%s: IO Request:0x%p Frame Id:%d protocol "
+ "violation occurred\n",
+ __func__,
+ stp_req,
+ frame_index);
+
+ ireq->scu_status = SCU_TASK_DONE_UNEXP_FIS;
+ ireq->sci_status = SCI_FAILURE_PROTOCOL_VIOLATION;
+ break;
+ }
+
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+
+ /* Frame has been decoded return it to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+
+ return status;
+ }
+ case SCI_REQ_ABORTING:
+ /*
+ * TODO: Is it even possible to get an unsolicited frame in the
+ * aborting state?
+ */
+ sci_controller_release_frame(ihost, frame_index);
+ return SCI_SUCCESS;
+
+ default:
+ dev_warn(&ihost->pdev->dev,
+ "%s: SCIC IO Request given unexpected frame %x while "
+ "in state %d\n",
+ __func__,
+ frame_index,
+ state);
+
+ sci_controller_release_frame(ihost, frame_index);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+}
+
+static enum sci_status stp_request_udma_await_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ enum sci_status status = SCI_SUCCESS;
+
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_FIS):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
+ /* We must check ther response buffer to see if the D2H
+ * Register FIS was received before we got the TC
+ * completion.
+ */
+ if (ireq->stp.rsp.fis_type == FIS_REGD2H) {
+ sci_remote_device_suspend(ireq->target_device,
+ SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
+
+ ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
+ ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ } else {
+ /* If we have an error completion status for the
+ * TC then we can expect a D2H register FIS from
+ * the device so we must change state to wait
+ * for it
+ */
+ sci_change_state(&ireq->sm, SCI_REQ_STP_UDMA_WAIT_D2H);
+ }
+ break;
+
+ /* TODO Check to see if any of these completion status need to
+ * wait for the device to host register fis.
+ */
+ /* TODO We can retry the command for SCU_TASK_DONE_CMD_LL_R_ERR
+ * - this comes only for B0
+ */
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_INV_FIS_LEN):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_R_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CMD_LL_R_ERR):
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CRC_ERR):
+ sci_remote_device_suspend(ireq->target_device,
+ SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
+ /* Fall through to the default case */
+ default:
+ /* All other completion status cause the IO to be complete. */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return status;
+}
+
+static enum sci_status
+stp_request_soft_reset_await_h2d_asserted_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG);
+ break;
+
+ default:
+ /*
+ * All other completion status cause the IO to be complete.
+ * If a NAK was received, then it is up to the user to retry
+ * the request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static enum sci_status
+stp_request_soft_reset_await_h2d_diagnostic_tc_event(struct isci_request *ireq,
+ u32 completion_code)
+{
+ switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
+ case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
+ ireq->scu_status = SCU_TASK_DONE_GOOD;
+ ireq->sci_status = SCI_SUCCESS;
+ sci_change_state(&ireq->sm, SCI_REQ_STP_SOFT_RESET_WAIT_D2H);
+ break;
+
+ default:
+ /* All other completion status cause the IO to be complete. If
+ * a NAK was received, then it is up to the user to retry the
+ * request.
+ */
+ ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
+ ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
+ sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
+ break;
+ }
+
+ return SCI_SUCCESS;
+}
+
+enum sci_status
+sci_io_request_tc_completion(struct isci_request *ireq,
+ u32 completion_code)
+{
+ enum sci_base_request_states state;
+ struct isci_host *ihost = ireq->owning_controller;
+
+ state = ireq->sm.current_state_id;
+
+ switch (state) {
+ case SCI_REQ_STARTED:
+ return request_started_state_tc_event(ireq, completion_code);
+
+ case SCI_REQ_TASK_WAIT_TC_COMP:
+ return ssp_task_request_await_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_SMP_WAIT_RESP:
+ return smp_request_await_response_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_SMP_WAIT_TC_COMP:
+ return smp_request_await_tc_event(ireq, completion_code);
+
+ case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
+ return stp_request_udma_await_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_STP_NON_DATA_WAIT_H2D:
+ return stp_request_non_data_await_h2d_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_STP_PIO_WAIT_H2D:
+ return stp_request_pio_await_h2d_completion_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_STP_PIO_DATA_OUT:
+ return pio_data_out_tx_done_tc_event(ireq, completion_code);
+
+ case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
+ return stp_request_soft_reset_await_h2d_asserted_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
+ return stp_request_soft_reset_await_h2d_diagnostic_tc_event(ireq,
+ completion_code);
+
+ case SCI_REQ_ABORTING:
+ return request_aborting_state_tc_event(ireq,
+ completion_code);
+
+ default:
+ dev_warn(&ihost->pdev->dev,
+ "%s: SCIC IO Request given task completion "
+ "notification %x while in wrong state %d\n",
+ __func__,
+ completion_code,
+ state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+}
+
+/**
+ * isci_request_process_response_iu() - This function sets the status and
+ * response iu, in the task struct, from the request object for the upper
+ * layer driver.
+ * @sas_task: This parameter is the task struct from the upper layer driver.
+ * @resp_iu: This parameter points to the response iu of the completed request.
+ * @dev: This parameter specifies the linux device struct.
+ *
+ * none.
+ */
+static void isci_request_process_response_iu(
+ struct sas_task *task,
+ struct ssp_response_iu *resp_iu,
+ struct device *dev)
+{
+ dev_dbg(dev,
+ "%s: resp_iu = %p "
+ "resp_iu->status = 0x%x,\nresp_iu->datapres = %d "
+ "resp_iu->response_data_len = %x, "
+ "resp_iu->sense_data_len = %x\nrepsonse data: ",
+ __func__,
+ resp_iu,
+ resp_iu->status,
+ resp_iu->datapres,
+ resp_iu->response_data_len,
+ resp_iu->sense_data_len);
+
+ task->task_status.stat = resp_iu->status;
+
+ /* libsas updates the task status fields based on the response iu. */
+ sas_ssp_task_response(dev, task, resp_iu);
+}
+
+/**
+ * isci_request_set_open_reject_status() - This function prepares the I/O
+ * completion for OPEN_REJECT conditions.
+ * @request: This parameter is the completed isci_request object.
+ * @response_ptr: This parameter specifies the service response for the I/O.
+ * @status_ptr: This parameter specifies the exec status for the I/O.
+ * @complete_to_host_ptr: This parameter specifies the action to be taken by
+ * the LLDD with respect to completing this request or forcing an abort
+ * condition on the I/O.
+ * @open_rej_reason: This parameter specifies the encoded reason for the
+ * abandon-class reject.
+ *
+ * none.
+ */
+static void isci_request_set_open_reject_status(
+ struct isci_request *request,
+ struct sas_task *task,
+ enum service_response *response_ptr,
+ enum exec_status *status_ptr,
+ enum isci_completion_selection *complete_to_host_ptr,
+ enum sas_open_rej_reason open_rej_reason)
+{
+ /* Task in the target is done. */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ *response_ptr = SAS_TASK_UNDELIVERED;
+ *status_ptr = SAS_OPEN_REJECT;
+ *complete_to_host_ptr = isci_perform_normal_io_completion;
+ task->task_status.open_rej_reason = open_rej_reason;
+}
+
+/**
+ * isci_request_handle_controller_specific_errors() - This function decodes
+ * controller-specific I/O completion error conditions.
+ * @request: This parameter is the completed isci_request object.
+ * @response_ptr: This parameter specifies the service response for the I/O.
+ * @status_ptr: This parameter specifies the exec status for the I/O.
+ * @complete_to_host_ptr: This parameter specifies the action to be taken by
+ * the LLDD with respect to completing this request or forcing an abort
+ * condition on the I/O.
+ *
+ * none.
+ */
+static void isci_request_handle_controller_specific_errors(
+ struct isci_remote_device *idev,
+ struct isci_request *request,
+ struct sas_task *task,
+ enum service_response *response_ptr,
+ enum exec_status *status_ptr,
+ enum isci_completion_selection *complete_to_host_ptr)
+{
+ unsigned int cstatus;
+
+ cstatus = request->scu_status;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
+ "- controller status = 0x%x\n",
+ __func__, request, cstatus);
+
+ /* Decode the controller-specific errors; most
+ * important is to recognize those conditions in which
+ * the target may still have a task outstanding that
+ * must be aborted.
+ *
+ * Note that there are SCU completion codes being
+ * named in the decode below for which SCIC has already
+ * done work to handle them in a way other than as
+ * a controller-specific completion code; these are left
+ * in the decode below for completeness sake.
+ */
+ switch (cstatus) {
+ case SCU_TASK_DONE_DMASETUP_DIRERR:
+ /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */
+ case SCU_TASK_DONE_XFERCNT_ERR:
+ /* Also SCU_TASK_DONE_SMP_UFI_ERR: */
+ if (task->task_proto == SAS_PROTOCOL_SMP) {
+ /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */
+ *response_ptr = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAS_ABORTED_TASK;
+
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ *complete_to_host_ptr =
+ isci_perform_normal_io_completion;
+ } else {
+ /* Task in the target is not done. */
+ *response_ptr = SAS_TASK_UNDELIVERED;
+
+ if (!idev)
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAM_STAT_TASK_ABORTED;
+
+ clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ *complete_to_host_ptr =
+ isci_perform_error_io_completion;
+ }
+
+ break;
+
+ case SCU_TASK_DONE_CRC_ERR:
+ case SCU_TASK_DONE_NAK_CMD_ERR:
+ case SCU_TASK_DONE_EXCESS_DATA:
+ case SCU_TASK_DONE_UNEXP_FIS:
+ /* Also SCU_TASK_DONE_UNEXP_RESP: */
+ case SCU_TASK_DONE_VIIT_ENTRY_NV: /* TODO - conditions? */
+ case SCU_TASK_DONE_IIT_ENTRY_NV: /* TODO - conditions? */
+ case SCU_TASK_DONE_RNCNV_OUTBOUND: /* TODO - conditions? */
+ /* These are conditions in which the target
+ * has completed the task, so that no cleanup
+ * is necessary.
+ */
+ *response_ptr = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAS_ABORTED_TASK;
+
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ *complete_to_host_ptr = isci_perform_normal_io_completion;
+ break;
+
+
+ /* Note that the only open reject completion codes seen here will be
+ * abandon-class codes; all others are automatically retried in the SCU.
+ */
+ case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_WRONG_DEST);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
+
+ /* Note - the return of AB0 will change when
+ * libsas implements detection of zone violations.
+ */
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB0);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB1);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB2);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB3);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_BAD_DEST);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_STP_NORES);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_EPROTO);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_CONN_RATE);
+ break;
+
+ case SCU_TASK_DONE_LL_R_ERR:
+ /* Also SCU_TASK_DONE_ACK_NAK_TO: */
+ case SCU_TASK_DONE_LL_PERR:
+ case SCU_TASK_DONE_LL_SY_TERM:
+ /* Also SCU_TASK_DONE_NAK_ERR:*/
+ case SCU_TASK_DONE_LL_LF_TERM:
+ /* Also SCU_TASK_DONE_DATA_LEN_ERR: */
+ case SCU_TASK_DONE_LL_ABORT_ERR:
+ case SCU_TASK_DONE_SEQ_INV_TYPE:
+ /* Also SCU_TASK_DONE_UNEXP_XR: */
+ case SCU_TASK_DONE_XR_IU_LEN_ERR:
+ case SCU_TASK_DONE_INV_FIS_LEN:
+ /* Also SCU_TASK_DONE_XR_WD_LEN: */
+ case SCU_TASK_DONE_SDMA_ERR:
+ case SCU_TASK_DONE_OFFSET_ERR:
+ case SCU_TASK_DONE_MAX_PLD_ERR:
+ case SCU_TASK_DONE_LF_ERR:
+ case SCU_TASK_DONE_SMP_RESP_TO_ERR: /* Escalate to dev reset? */
+ case SCU_TASK_DONE_SMP_LL_RX_ERR:
+ case SCU_TASK_DONE_UNEXP_DATA:
+ case SCU_TASK_DONE_UNEXP_SDBFIS:
+ case SCU_TASK_DONE_REG_ERR:
+ case SCU_TASK_DONE_SDB_ERR:
+ case SCU_TASK_DONE_TASK_ABORT:
+ default:
+ /* Task in the target is not done. */
+ *response_ptr = SAS_TASK_UNDELIVERED;
+ *status_ptr = SAM_STAT_TASK_ABORTED;
+
+ if (task->task_proto == SAS_PROTOCOL_SMP) {
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ *complete_to_host_ptr = isci_perform_normal_io_completion;
+ } else {
+ clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ *complete_to_host_ptr = isci_perform_error_io_completion;
+ }
+ break;
+ }
+}
+
+/**
+ * isci_task_save_for_upper_layer_completion() - This function saves the
+ * request for later completion to the upper layer driver.
+ * @host: This parameter is a pointer to the host on which the the request
+ * should be queued (either as an error or success).
+ * @request: This parameter is the completed request.
+ * @response: This parameter is the response code for the completed task.
+ * @status: This parameter is the status code for the completed task.
+ *
+ * none.
+ */
+static void isci_task_save_for_upper_layer_completion(
+ struct isci_host *host,
+ struct isci_request *request,
+ enum service_response response,
+ enum exec_status status,
+ enum isci_completion_selection task_notification_selection)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ task_notification_selection
+ = isci_task_set_completion_status(task, response, status,
+ task_notification_selection);
+
+ /* Tasks aborted specifically by a call to the lldd_abort_task
+ * function should not be completed to the host in the regular path.
+ */
+ switch (task_notification_selection) {
+
+ case isci_perform_normal_io_completion:
+
+ /* Normal notification (task_done) */
+ dev_dbg(&host->pdev->dev,
+ "%s: Normal - task = %p, response=%d (%d), status=%d (%d)\n",
+ __func__,
+ task,
+ task->task_status.resp, response,
+ task->task_status.stat, status);
+ /* Add to the completed list. */
+ list_add(&request->completed_node,
+ &host->requests_to_complete);
+
+ /* Take the request off the device's pending request list. */
+ list_del_init(&request->dev_node);
+ break;
+
+ case isci_perform_aborted_io_completion:
+ /* No notification to libsas because this request is
+ * already in the abort path.
+ */
+ dev_dbg(&host->pdev->dev,
+ "%s: Aborted - task = %p, response=%d (%d), status=%d (%d)\n",
+ __func__,
+ task,
+ task->task_status.resp, response,
+ task->task_status.stat, status);
+
+ /* Wake up whatever process was waiting for this
+ * request to complete.
+ */
+ WARN_ON(request->io_request_completion == NULL);
+
+ if (request->io_request_completion != NULL) {
+
+ /* Signal whoever is waiting that this
+ * request is complete.
+ */
+ complete(request->io_request_completion);
+ }
+ break;
+
+ case isci_perform_error_io_completion:
+ /* Use sas_task_abort */
+ dev_dbg(&host->pdev->dev,
+ "%s: Error - task = %p, response=%d (%d), status=%d (%d)\n",
+ __func__,
+ task,
+ task->task_status.resp, response,
+ task->task_status.stat, status);
+ /* Add to the aborted list. */
+ list_add(&request->completed_node,
+ &host->requests_to_errorback);
+ break;
+
+ default:
+ dev_dbg(&host->pdev->dev,
+ "%s: Unknown - task = %p, response=%d (%d), status=%d (%d)\n",
+ __func__,
+ task,
+ task->task_status.resp, response,
+ task->task_status.stat, status);
+
+ /* Add to the error to libsas list. */
+ list_add(&request->completed_node,
+ &host->requests_to_errorback);
+ break;
+ }
+}
+
+static void isci_request_process_stp_response(struct sas_task *task,
+ void *response_buffer)
+{
+ struct dev_to_host_fis *d2h_reg_fis = response_buffer;
+ struct task_status_struct *ts = &task->task_status;
+ struct ata_task_resp *resp = (void *)&ts->buf[0];
+
+ resp->frame_len = le16_to_cpu(*(__le16 *)(response_buffer + 6));
+ memcpy(&resp->ending_fis[0], response_buffer + 16, 24);
+ ts->buf_valid_size = sizeof(*resp);
+
+ /**
+ * If the device fault bit is set in the status register, then
+ * set the sense data and return.
+ */
+ if (d2h_reg_fis->status & ATA_DF)
+ ts->stat = SAS_PROTO_RESPONSE;
+ else
+ ts->stat = SAM_STAT_GOOD;
+
+ ts->resp = SAS_TASK_COMPLETE;
+}
+
+static void isci_request_io_request_complete(struct isci_host *ihost,
+ struct isci_request *request,
+ enum sci_io_status completion_status)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ struct ssp_response_iu *resp_iu;
+ void *resp_buf;
+ unsigned long task_flags;
+ struct isci_remote_device *idev = isci_lookup_device(task->dev);
+ enum service_response response = SAS_TASK_UNDELIVERED;
+ enum exec_status status = SAS_ABORTED_TASK;
+ enum isci_request_status request_status;
+ enum isci_completion_selection complete_to_host
+ = isci_perform_normal_io_completion;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: request = %p, task = %p,\n"
+ "task->data_dir = %d completion_status = 0x%x\n",
+ __func__,
+ request,
+ task,
+ task->data_dir,
+ completion_status);
+
+ spin_lock(&request->state_lock);
+ request_status = request->status;
+
+ /* Decode the request status. Note that if the request has been
+ * aborted by a task management function, we don't care
+ * what the status is.
+ */
+ switch (request_status) {
+
+ case aborted:
+ /* "aborted" indicates that the request was aborted by a task
+ * management function, since once a task management request is
+ * perfomed by the device, the request only completes because
+ * of the subsequent driver terminate.
+ *
+ * Aborted also means an external thread is explicitly managing
+ * this request, so that we do not complete it up the stack.
+ *
+ * The target is still there (since the TMF was successful).
+ */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ response = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_aborted_io_completion;
+ /* This was an aborted request. */
+
+ spin_unlock(&request->state_lock);
+ break;
+
+ case aborting:
+ /* aborting means that the task management function tried and
+ * failed to abort the request. We need to note the request
+ * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the
+ * target as down.
+ *
+ * Aborting also means an external thread is explicitly managing
+ * this request, so that we do not complete it up the stack.
+ */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ response = SAS_TASK_UNDELIVERED;
+
+ if (!idev)
+ /* The device has been /is being stopped. Note that
+ * we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_PHY_DOWN;
+
+ complete_to_host = isci_perform_aborted_io_completion;
+
+ /* This was an aborted request. */
+
+ spin_unlock(&request->state_lock);
+ break;
+
+ case terminating:
+
+ /* This was an terminated request. This happens when
+ * the I/O is being terminated because of an action on
+ * the device (reset, tear down, etc.), and the I/O needs
+ * to be completed up the stack.
+ */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_aborted_io_completion;
+
+ /* This was a terminated request. */
+
+ spin_unlock(&request->state_lock);
+ break;
+
+ case dead:
+ /* This was a terminated request that timed-out during the
+ * termination process. There is no task to complete to
+ * libsas.
+ */
+ complete_to_host = isci_perform_normal_io_completion;
+ spin_unlock(&request->state_lock);
+ break;
+
+ default:
+
+ /* The request is done from an SCU HW perspective. */
+ request->status = completed;
+
+ spin_unlock(&request->state_lock);
+
+ /* This is an active request being completed from the core. */
+ switch (completion_status) {
+
+ case SCI_IO_FAILURE_RESPONSE_VALID:
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n",
+ __func__,
+ request,
+ task);
+
+ if (sas_protocol_ata(task->task_proto)) {
+ resp_buf = &request->stp.rsp;
+ isci_request_process_stp_response(task,
+ resp_buf);
+ } else if (SAS_PROTOCOL_SSP == task->task_proto) {
+
+ /* crack the iu response buffer. */
+ resp_iu = &request->ssp.rsp;
+ isci_request_process_response_iu(task, resp_iu,
+ &ihost->pdev->dev);
+
+ } else if (SAS_PROTOCOL_SMP == task->task_proto) {
+
+ dev_err(&ihost->pdev->dev,
+ "%s: SCI_IO_FAILURE_RESPONSE_VALID: "
+ "SAS_PROTOCOL_SMP protocol\n",
+ __func__);
+
+ } else
+ dev_err(&ihost->pdev->dev,
+ "%s: unknown protocol\n", __func__);
+
+ /* use the task status set in the task struct by the
+ * isci_request_process_response_iu call.
+ */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ response = task->task_status.resp;
+ status = task->task_status.stat;
+ break;
+
+ case SCI_IO_SUCCESS:
+ case SCI_IO_SUCCESS_IO_DONE_EARLY:
+
+ response = SAS_TASK_COMPLETE;
+ status = SAM_STAT_GOOD;
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+
+ if (task->task_proto == SAS_PROTOCOL_SMP) {
+ void *rsp = &request->smp.rsp;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SMP protocol completion\n",
+ __func__);
+
+ sg_copy_from_buffer(
+ &task->smp_task.smp_resp, 1,
+ rsp, sizeof(struct smp_resp));
+ } else if (completion_status
+ == SCI_IO_SUCCESS_IO_DONE_EARLY) {
+
+ /* This was an SSP / STP / SATA transfer.
+ * There is a possibility that less data than
+ * the maximum was transferred.
+ */
+ u32 transferred_length = sci_req_tx_bytes(request);
+
+ task->task_status.residual
+ = task->total_xfer_len - transferred_length;
+
+ /* If there were residual bytes, call this an
+ * underrun.
+ */
+ if (task->task_status.residual != 0)
+ status = SAS_DATA_UNDERRUN;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n",
+ __func__,
+ status);
+
+ } else
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SCI_IO_SUCCESS\n",
+ __func__);
+
+ break;
+
+ case SCI_IO_FAILURE_TERMINATED:
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n",
+ __func__,
+ request,
+ task);
+
+ /* The request was terminated explicitly. No handling
+ * is needed in the SCSI error handler path.
+ */
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_normal_io_completion;
+ break;
+
+ case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
+
+ isci_request_handle_controller_specific_errors(
+ idev, request, task, &response, &status,
+ &complete_to_host);
+
+ break;
+
+ case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
+ /* This is a special case, in that the I/O completion
+ * is telling us that the device needs a reset.
+ * In order for the device reset condition to be
+ * noticed, the I/O has to be handled in the error
+ * handler. Set the reset flag and cause the
+ * SCSI error thread to be scheduled.
+ */
+ spin_lock_irqsave(&task->task_state_lock, task_flags);
+ task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, task_flags);
+
+ /* Fail the I/O. */
+ response = SAS_TASK_UNDELIVERED;
+ status = SAM_STAT_TASK_ABORTED;
+
+ complete_to_host = isci_perform_error_io_completion;
+ clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ break;
+
+ case SCI_FAILURE_RETRY_REQUIRED:
+
+ /* Fail the I/O so it can be retried. */
+ response = SAS_TASK_UNDELIVERED;
+ if (!idev)
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_normal_io_completion;
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ break;
+
+
+ default:
+ /* Catch any otherwise unhandled error codes here. */
+ dev_dbg(&ihost->pdev->dev,
+ "%s: invalid completion code: 0x%x - "
+ "isci_request = %p\n",
+ __func__, completion_status, request);
+
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if (!idev)
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ if (SAS_PROTOCOL_SMP == task->task_proto) {
+ set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ complete_to_host = isci_perform_normal_io_completion;
+ } else {
+ clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
+ complete_to_host = isci_perform_error_io_completion;
+ }
+ break;
+ }
+ break;
+ }
+
+ switch (task->task_proto) {
+ case SAS_PROTOCOL_SSP:
+ if (task->data_dir == DMA_NONE)
+ break;
+ if (task->num_scatter == 0)
+ /* 0 indicates a single dma address */
+ dma_unmap_single(&ihost->pdev->dev,
+ request->zero_scatter_daddr,
+ task->total_xfer_len, task->data_dir);
+ else /* unmap the sgl dma addresses */
+ dma_unmap_sg(&ihost->pdev->dev, task->scatter,
+ request->num_sg_entries, task->data_dir);
+ break;
+ case SAS_PROTOCOL_SMP: {
+ struct scatterlist *sg = &task->smp_task.smp_req;
+ struct smp_req *smp_req;
+ void *kaddr;
+
+ dma_unmap_sg(&ihost->pdev->dev, sg, 1, DMA_TO_DEVICE);
+
+ /* need to swab it back in case the command buffer is re-used */
+ kaddr = kmap_atomic(sg_page(sg), KM_IRQ0);
+ smp_req = kaddr + sg->offset;
+ sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
+ kunmap_atomic(kaddr, KM_IRQ0);
+ break;
+ }
+ default:
+ break;
+ }
+
+ /* Put the completed request on the correct list */
+ isci_task_save_for_upper_layer_completion(ihost, request, response,
+ status, complete_to_host
+ );
+
+ /* complete the io request to the core. */
+ sci_controller_complete_io(ihost, request->target_device, request);
+ isci_put_device(idev);
+
+ /* set terminated handle so it cannot be completed or
+ * terminated again, and to cause any calls into abort
+ * task to recognize the already completed case.
+ */
+ set_bit(IREQ_TERMINATED, &request->flags);
+}
+
+static void sci_request_started_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+ struct domain_device *dev = ireq->target_device->domain_dev;
+ struct sas_task *task;
+
+ /* XXX as hch said always creating an internal sas_task for tmf
+ * requests would simplify the driver
+ */
+ task = ireq->ttype == io_task ? isci_request_access_task(ireq) : NULL;
+
+ /* all unaccelerated request types (non ssp or ncq) handled with
+ * substates
+ */
+ if (!task && dev->dev_type == SAS_END_DEV) {
+ sci_change_state(sm, SCI_REQ_TASK_WAIT_TC_COMP);
+ } else if (!task &&
+ (isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_high ||
+ isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_low)) {
+ sci_change_state(sm, SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED);
+ } else if (task && task->task_proto == SAS_PROTOCOL_SMP) {
+ sci_change_state(sm, SCI_REQ_SMP_WAIT_RESP);
+ } else if (task && sas_protocol_ata(task->task_proto) &&
+ !task->ata_task.use_ncq) {
+ u32 state;
+
+ if (task->data_dir == DMA_NONE)
+ state = SCI_REQ_STP_NON_DATA_WAIT_H2D;
+ else if (task->ata_task.dma_xfer)
+ state = SCI_REQ_STP_UDMA_WAIT_TC_COMP;
+ else /* PIO */
+ state = SCI_REQ_STP_PIO_WAIT_H2D;
+
+ sci_change_state(sm, state);
+ }
+}
+
+static void sci_request_completed_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+ struct isci_host *ihost = ireq->owning_controller;
+
+ /* Tell the SCI_USER that the IO request is complete */
+ if (!test_bit(IREQ_TMF, &ireq->flags))
+ isci_request_io_request_complete(ihost, ireq,
+ ireq->sci_status);
+ else
+ isci_task_request_complete(ihost, ireq, ireq->sci_status);
+}
+
+static void sci_request_aborting_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+
+ /* Setting the abort bit in the Task Context is required by the silicon. */
+ ireq->tc->abort = 1;
+}
+
+static void sci_stp_request_started_non_data_await_h2d_completion_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+
+ ireq->target_device->working_request = ireq;
+}
+
+static void sci_stp_request_started_pio_await_h2d_completion_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+
+ ireq->target_device->working_request = ireq;
+}
+
+static void sci_stp_request_started_soft_reset_await_h2d_asserted_completion_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+
+ ireq->target_device->working_request = ireq;
+}
+
+static void sci_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
+ struct scu_task_context *tc = ireq->tc;
+ struct host_to_dev_fis *h2d_fis;
+ enum sci_status status;
+
+ /* Clear the SRST bit */
+ h2d_fis = &ireq->stp.cmd;
+ h2d_fis->control = 0;
+
+ /* Clear the TC control bit */
+ tc->control_frame = 0;
+
+ status = sci_controller_continue_io(ireq);
+ WARN_ONCE(status != SCI_SUCCESS, "isci: continue io failure\n");
+}
+
+static const struct sci_base_state sci_request_state_table[] = {
+ [SCI_REQ_INIT] = { },
+ [SCI_REQ_CONSTRUCTED] = { },
+ [SCI_REQ_STARTED] = {
+ .enter_state = sci_request_started_state_enter,
+ },
+ [SCI_REQ_STP_NON_DATA_WAIT_H2D] = {
+ .enter_state = sci_stp_request_started_non_data_await_h2d_completion_enter,
+ },
+ [SCI_REQ_STP_NON_DATA_WAIT_D2H] = { },
+ [SCI_REQ_STP_PIO_WAIT_H2D] = {
+ .enter_state = sci_stp_request_started_pio_await_h2d_completion_enter,
+ },
+ [SCI_REQ_STP_PIO_WAIT_FRAME] = { },
+ [SCI_REQ_STP_PIO_DATA_IN] = { },
+ [SCI_REQ_STP_PIO_DATA_OUT] = { },
+ [SCI_REQ_STP_UDMA_WAIT_TC_COMP] = { },
+ [SCI_REQ_STP_UDMA_WAIT_D2H] = { },
+ [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED] = {
+ .enter_state = sci_stp_request_started_soft_reset_await_h2d_asserted_completion_enter,
+ },
+ [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG] = {
+ .enter_state = sci_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter,
+ },
+ [SCI_REQ_STP_SOFT_RESET_WAIT_D2H] = { },
+ [SCI_REQ_TASK_WAIT_TC_COMP] = { },
+ [SCI_REQ_TASK_WAIT_TC_RESP] = { },
+ [SCI_REQ_SMP_WAIT_RESP] = { },
+ [SCI_REQ_SMP_WAIT_TC_COMP] = { },
+ [SCI_REQ_COMPLETED] = {
+ .enter_state = sci_request_completed_state_enter,
+ },
+ [SCI_REQ_ABORTING] = {
+ .enter_state = sci_request_aborting_state_enter,
+ },
+ [SCI_REQ_FINAL] = { },
+};
+
+static void
+sci_general_request_construct(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ sci_init_sm(&ireq->sm, sci_request_state_table, SCI_REQ_INIT);
+
+ ireq->target_device = idev;
+ ireq->protocol = SCIC_NO_PROTOCOL;
+ ireq->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
+
+ ireq->sci_status = SCI_SUCCESS;
+ ireq->scu_status = 0;
+ ireq->post_context = 0xFFFFFFFF;
+}
+
+static enum sci_status
+sci_io_request_construct(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ struct domain_device *dev = idev->domain_dev;
+ enum sci_status status = SCI_SUCCESS;
+
+ /* Build the common part of the request */
+ sci_general_request_construct(ihost, idev, ireq);
+
+ if (idev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
+ return SCI_FAILURE_INVALID_REMOTE_DEVICE;
+
+ if (dev->dev_type == SAS_END_DEV)
+ /* pass */;
+ else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
+ memset(&ireq->stp.cmd, 0, sizeof(ireq->stp.cmd));
+ else if (dev_is_expander(dev))
+ /* pass */;
+ else
+ return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+
+ memset(ireq->tc, 0, offsetof(struct scu_task_context, sgl_pair_ab));
+
+ return status;
+}
+
+enum sci_status sci_task_request_construct(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ u16 io_tag, struct isci_request *ireq)
+{
+ struct domain_device *dev = idev->domain_dev;
+ enum sci_status status = SCI_SUCCESS;
+
+ /* Build the common part of the request */
+ sci_general_request_construct(ihost, idev, ireq);
+
+ if (dev->dev_type == SAS_END_DEV ||
+ dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
+ set_bit(IREQ_TMF, &ireq->flags);
+ memset(ireq->tc, 0, sizeof(struct scu_task_context));
+ } else
+ status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+
+ return status;
+}
+
+static enum sci_status isci_request_ssp_request_construct(
+ struct isci_request *request)
+{
+ enum sci_status status;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p\n",
+ __func__,
+ request);
+ status = sci_io_request_construct_basic_ssp(request);
+ return status;
+}
+
+static enum sci_status isci_request_stp_request_construct(struct isci_request *ireq)
+{
+ struct sas_task *task = isci_request_access_task(ireq);
+ struct host_to_dev_fis *fis = &ireq->stp.cmd;
+ struct ata_queued_cmd *qc = task->uldd_task;
+ enum sci_status status;
+
+ dev_dbg(&ireq->isci_host->pdev->dev,
+ "%s: ireq = %p\n",
+ __func__,
+ ireq);
+
+ memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
+ if (!task->ata_task.device_control_reg_update)
+ fis->flags |= 0x80;
+ fis->flags &= 0xF0;
+
+ status = sci_io_request_construct_basic_sata(ireq);
+
+ if (qc && (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
+ qc->tf.command == ATA_CMD_FPDMA_READ)) {
+ fis->sector_count = qc->tag << 3;
+ ireq->tc->type.stp.ncq_tag = qc->tag;
+ }
+
+ return status;
+}
+
+static enum sci_status
+sci_io_request_construct_smp(struct device *dev,
+ struct isci_request *ireq,
+ struct sas_task *task)
+{
+ struct scatterlist *sg = &task->smp_task.smp_req;
+ struct isci_remote_device *idev;
+ struct scu_task_context *task_context;
+ struct isci_port *iport;
+ struct smp_req *smp_req;
+ void *kaddr;
+ u8 req_len;
+ u32 cmd;
+
+ kaddr = kmap_atomic(sg_page(sg), KM_IRQ0);
+ smp_req = kaddr + sg->offset;
+ /*
+ * Look at the SMP requests' header fields; for certain SAS 1.x SMP
+ * functions under SAS 2.0, a zero request length really indicates
+ * a non-zero default length.
+ */
+ if (smp_req->req_len == 0) {
+ switch (smp_req->func) {
+ case SMP_DISCOVER:
+ case SMP_REPORT_PHY_ERR_LOG:
+ case SMP_REPORT_PHY_SATA:
+ case SMP_REPORT_ROUTE_INFO:
+ smp_req->req_len = 2;
+ break;
+ case SMP_CONF_ROUTE_INFO:
+ case SMP_PHY_CONTROL:
+ case SMP_PHY_TEST_FUNCTION:
+ smp_req->req_len = 9;
+ break;
+ /* Default - zero is a valid default for 2.0. */
+ }
+ }
+ req_len = smp_req->req_len;
+ sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
+ cmd = *(u32 *) smp_req;
+ kunmap_atomic(kaddr, KM_IRQ0);
+
+ if (!dma_map_sg(dev, sg, 1, DMA_TO_DEVICE))
+ return SCI_FAILURE;
+
+ ireq->protocol = SCIC_SMP_PROTOCOL;
+
+ /* byte swap the smp request. */
+
+ task_context = ireq->tc;
+
+ idev = ireq->target_device;
+ iport = idev->owning_port;
+
+ /*
+ * Fill in the TC with the its required data
+ * 00h
+ */
+ 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_SMP;
+ task_context->abort = 0;
+ task_context->valid = SCU_TASK_CONTEXT_VALID;
+ task_context->context_type = SCU_TASK_CONTEXT_TYPE;
+
+ /* 04h */
+ task_context->remote_node_index = idev->rnc.remote_node_index;
+ task_context->command_code = 0;
+ task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;
+
+ /* 08h */
+ task_context->link_layer_control = 0;
+ task_context->do_not_dma_ssp_good_response = 1;
+ task_context->strict_ordering = 0;
+ task_context->control_frame = 1;
+ task_context->timeout_enable = 0;
+ task_context->block_guard_enable = 0;
+
+ /* 0ch */
+ task_context->address_modifier = 0;
+
+ /* 10h */
+ task_context->ssp_command_iu_length = req_len;
+
+ /* 14h */
+ task_context->transfer_length_bytes = 0;
+
+ /*
+ * 18h ~ 30h, protocol specific
+ * since commandIU has been build by framework at this point, we just
+ * copy the frist DWord from command IU to this location. */
+ memcpy(&task_context->type.smp, &cmd, sizeof(u32));
+
+ /*
+ * 40h
+ * "For SMP you could program it to zero. We would prefer that way
+ * so that done code will be consistent." - Venki
+ */
+ task_context->task_phase = 0;
+
+ 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 command buffer should not contain command header.
+ */
+ task_context->command_iu_upper = upper_32_bits(sg_dma_address(sg));
+ task_context->command_iu_lower = lower_32_bits(sg_dma_address(sg) + sizeof(u32));
+
+ /* SMP response comes as UF, so no need to set response IU address. */
+ task_context->response_iu_upper = 0;
+ task_context->response_iu_lower = 0;
+
+ sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
+
+ return SCI_SUCCESS;
+}
+
+/*
+ * isci_smp_request_build() - This function builds the smp request.
+ * @ireq: This parameter points to the isci_request allocated in the
+ * request construct function.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+static enum sci_status isci_smp_request_build(struct isci_request *ireq)
+{
+ struct sas_task *task = isci_request_access_task(ireq);
+ struct device *dev = &ireq->isci_host->pdev->dev;
+ enum sci_status status = SCI_FAILURE;
+
+ status = sci_io_request_construct_smp(dev, ireq, task);
+ if (status != SCI_SUCCESS)
+ dev_dbg(&ireq->isci_host->pdev->dev,
+ "%s: failed with status = %d\n",
+ __func__,
+ status);
+
+ return status;
+}
+
+/**
+ * isci_io_request_build() - This function builds the io request object.
+ * @ihost: This parameter specifies the ISCI host object
+ * @request: This parameter points to the isci_request object allocated in the
+ * request construct function.
+ * @sci_device: This parameter is the handle for the sci core's remote device
+ * object that is the destination for this request.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+static enum sci_status isci_io_request_build(struct isci_host *ihost,
+ struct isci_request *request,
+ struct isci_remote_device *idev)
+{
+ enum sci_status status = SCI_SUCCESS;
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: idev = 0x%p; request = %p, "
+ "num_scatter = %d\n",
+ __func__,
+ idev,
+ request,
+ task->num_scatter);
+
+ /* map the sgl addresses, if present.
+ * libata does the mapping for sata devices
+ * before we get the request.
+ */
+ if (task->num_scatter &&
+ !sas_protocol_ata(task->task_proto) &&
+ !(SAS_PROTOCOL_SMP & task->task_proto)) {
+
+ request->num_sg_entries = dma_map_sg(
+ &ihost->pdev->dev,
+ task->scatter,
+ task->num_scatter,
+ task->data_dir
+ );
+
+ if (request->num_sg_entries == 0)
+ return SCI_FAILURE_INSUFFICIENT_RESOURCES;
+ }
+
+ status = sci_io_request_construct(ihost, idev, request);
+
+ if (status != SCI_SUCCESS) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: failed request construct\n",
+ __func__);
+ return SCI_FAILURE;
+ }
+
+ switch (task->task_proto) {
+ case SAS_PROTOCOL_SMP:
+ status = isci_smp_request_build(request);
+ break;
+ case SAS_PROTOCOL_SSP:
+ status = isci_request_ssp_request_construct(request);
+ break;
+ case SAS_PROTOCOL_SATA:
+ case SAS_PROTOCOL_STP:
+ case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
+ status = isci_request_stp_request_construct(request);
+ break;
+ default:
+ dev_dbg(&ihost->pdev->dev,
+ "%s: unknown protocol\n", __func__);
+ return SCI_FAILURE;
+ }
+
+ return SCI_SUCCESS;
+}
+
+static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 tag)
+{
+ struct isci_request *ireq;
+
+ ireq = ihost->reqs[ISCI_TAG_TCI(tag)];
+ ireq->io_tag = tag;
+ ireq->io_request_completion = NULL;
+ ireq->flags = 0;
+ ireq->num_sg_entries = 0;
+ INIT_LIST_HEAD(&ireq->completed_node);
+ INIT_LIST_HEAD(&ireq->dev_node);
+ isci_request_change_state(ireq, allocated);
+
+ return ireq;
+}
+
+static struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
+ struct sas_task *task,
+ u16 tag)
+{
+ struct isci_request *ireq;
+
+ ireq = isci_request_from_tag(ihost, tag);
+ ireq->ttype_ptr.io_task_ptr = task;
+ ireq->ttype = io_task;
+ task->lldd_task = ireq;
+
+ return ireq;
+}
+
+struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
+ struct isci_tmf *isci_tmf,
+ u16 tag)
+{
+ struct isci_request *ireq;
+
+ ireq = isci_request_from_tag(ihost, tag);
+ ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
+ ireq->ttype = tmf_task;
+
+ return ireq;
+}
+
+int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
+ struct sas_task *task, u16 tag)
+{
+ enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+ struct isci_request *ireq;
+ unsigned long flags;
+ int ret = 0;
+
+ /* do common allocation and init of request object. */
+ ireq = isci_io_request_from_tag(ihost, task, tag);
+
+ status = isci_io_request_build(ihost, ireq, idev);
+ if (status != SCI_SUCCESS) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: request_construct failed - status = 0x%x\n",
+ __func__,
+ status);
+ return status;
+ }
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+
+ if (test_bit(IDEV_IO_NCQERROR, &idev->flags)) {
+
+ if (isci_task_is_ncq_recovery(task)) {
+
+ /* The device is in an NCQ recovery state. Issue the
+ * request on the task side. Note that it will
+ * complete on the I/O request side because the
+ * request was built that way (ie.
+ * ireq->is_task_management_request is false).
+ */
+ status = sci_controller_start_task(ihost,
+ idev,
+ ireq);
+ } else {
+ status = SCI_FAILURE;
+ }
+ } else {
+ /* send the request, let the core assign the IO TAG. */
+ status = sci_controller_start_io(ihost, idev,
+ ireq);
+ }
+
+ if (status != SCI_SUCCESS &&
+ status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: failed request start (0x%x)\n",
+ __func__, status);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ return status;
+ }
+
+ /* Either I/O started OK, or the core has signaled that
+ * the device needs a target reset.
+ *
+ * In either case, hold onto the I/O for later.
+ *
+ * Update it's status and add it to the list in the
+ * remote device object.
+ */
+ list_add(&ireq->dev_node, &idev->reqs_in_process);
+
+ if (status == SCI_SUCCESS) {
+ isci_request_change_state(ireq, started);
+ } else {
+ /* The request did not really start in the
+ * hardware, so clear the request handle
+ * here so no terminations will be done.
+ */
+ set_bit(IREQ_TERMINATED, &ireq->flags);
+ isci_request_change_state(ireq, completed);
+ }
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+ if (status ==
+ SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
+ /* Signal libsas that we need the SCSI error
+ * handler thread to work on this I/O and that
+ * we want a 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);
+
+ /* Cause this task to be scheduled in the SCSI error
+ * handler thread.
+ */
+ isci_execpath_callback(ihost, task,
+ sas_task_abort);
+
+ /* Change the status, since we are holding
+ * the I/O until it is managed by the SCSI
+ * error handler.
+ */
+ status = SCI_SUCCESS;
+ }
+
+ return ret;
+}

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