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Diffstat (limited to 'drivers/scsi/isci/request.c')
| -rw-r--r-- | drivers/scsi/isci/request.c | 3391 |
1 files changed, 3391 insertions, 0 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c new file mode 100644 index 000000000000..a46e07ac789f --- /dev/null +++ b/drivers/scsi/isci/request.c @@ -0,0 +1,3391 @@ +/* + * 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 |